Claims
- 1. A fluid pressure actuated motor comprising a housing closed to the atmosphere, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means responsive to the application of alternating relatively high and low pressures to said high and low pressure chambers for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said pressure chamber, and means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber.
- 2. A fluid pressure actuated motor comprising a housing closed to the atmosphere, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, said motor piston including an output portion, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, said means for creating a pressure differential between said high and low pressure chambers comprising means adapted to be connected to a source of alternating relatively high and low pressures and including means permitting flow from said low pressure chamber and preventing flow to said low pressure chamber, and means permitting flow to said high pressure chamber and preventing flow from said high pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, and means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber.
- 3. A fluid pressure actuated motor comprising a housing closed to the atmosphere, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, said motor piston including a output portion, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, and pressure relief means connected between said high and low pressure chambers to limit the pressure differential therebetween.
- 4. A fluid pressure actuated motor comprising a housing closed to the atmosphere, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means responsive to the application of alternating relatively high and low pressures to said high and low pressure chambers for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, and means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, said means for establishing and disconnecting communication between said high and low pressure chambers including a port in said motor piston, a valve member movable relative to said port between said open and closed positions, means biasing said valve member away from said port, and means on said housing engageable with said valve member to close said port in response to piston movement minimizing the volume of said one pressure chamber.
- 5. A fluid pressure actuated motor in accordance with claim 4 wherein said means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber comprises said port in said motor piston communicating between said low and high pressure chambers, said valve member which is movable between open and closed positions, whereby, when said valve member is in said closed position, and a pressure differential is created between said low and high pressure chambers, said motor piston is operable against the action of said motor piston biasing means so as to minimize the volume of said other pressure chamber, and said means biasing said valve member away from said port, which biasing means is operable, in response to motor piston movement minimizing the volume of said other pressure chamber, to displace said valve member toward said open position so as to permit limited flow from said high pressure chamber to said low pressure chamber when said valve member biasing means exerts a force which is slightly greater than the force resulting from the pressure differential between said low and high pressure chambers, and means in said other pressure chamber operable, in response to motor piston movement minimizing the volume of said other pressure chamber, to define an intermediate chamber communicating with said port and providing resistance to flow from said intermediate chamber to said other pressure chamber so as thereby to effect reduction in the pressure differential between said one pressure chamber and said intermediate chamber and thereby to cause movement of said valve member to said open position, whereby to substantially reduce the pressure differential between said low and high pressure chambers, and thereby to cause motor piston movement minimizing the volume of said one pressure chamber in response to the action of said motor piston biasing means.
- 6. A fluid pressure actuated motor comprising a housing closed to the atmosphere, a motor piston movable reciprocally in said housing through a given distance and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, said motor piston including an output portion, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, and means including a reciprocally movable element for pumping oil in response to reciprocation of said element, said movable element being reciprocable through said given distance, and said oil pumping means including means for varying the output thereof notwithstanding the reciprocation of said element through said given distance.
- 7. A fluid pressure actuated motor comprising a housing closed to the atmosphere, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, said motor piston including an output portion, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, fuel pumping means comprising a reciprocally movable member, and a variable volume fuel pumping chamber defined in part by said movable member, and oil pumping means including a reciprocally movable element, and a variable volume oil pumping chamber defined in part by said movable element, and wherein said motor piston, said member, and said element constitute an integral component.
- 8. A fluid pressure actuated motor in accordance with claim 7 wherein said oil pumping means includes oil discharge means including a valved bore extending in said component between said oil pumping chamber and said fuel pumping chamber.
- 9. A fluid pressure actuated motor comprising a housing, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, said means for creating a pressure differential between said high and low pressure chambers comprising means adapted to be connected to a source of alternating relatively high and low pressures and including means permitting flow from said low pressure chamber and preventing flow to said low pressure chamber, and means permitting flow to said high pressure chamber and preventing flow from said high pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, and means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber.
- 10. A fluid pressure actuated motor comprising a housing, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, and pressure relief means connected between said high and low pressure chambers to limit the pressure differential therebetween.
- 11. A fluid pressure actuated motor comprising a housing, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means responsive to the application of alternating relatively high and low pressures to said high and low pressure chambers for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, and means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, and means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, said means for establishing and disconnecting communication between said high and low pressure chambers including a port in said motor piston, a valve member movable relative to said port between open and closed positions, means biasing said valve member away from said port, and means on said housing engageable with said valve member for closing said port in response to piston movement minimizing the volume of said one pressure chamber.
- 12. A fluid pressure actuated motor in accordance with claim 11 wherein said means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber comprises said port in said motor piston communicating between said low and high pressure chambers, said valve member which is movable between open and closed positions, whereby, when said valve member is in said closed position and a pressure differential is created between said low and high pressure chambers, said motor piston is operable against the action of said motor piston biasing means so as to minimize the volume of said other pressure chamber, and said means biasing said valve member away from said ports said biasing means being operable in response to motor piston movement minimizing the volume of said other pressure chamber, to displace said valve member toward said open position so as to permit limited flow from said high pressure chamber to said low pressure chamber when said valve member biasing means exerts a force which is equal to, or slightly greater than, the force resulting from the pressure differential between said low and high pressure chambers, and means in said other pressure chamber operable, in response to motor piston movement minimizing the volume of said other pressure chamber, to define an intermediate chamber communicating with said port and providing resistance to flow from said intermediate chamber to said other pressure chamber so as thereby to effect reduction in the pressure differential between said one pressure chamber and said intermediate chamber and thereby to cause movement of said valve member to said open position, whereby to substantially reduce the pressure differential between said low and high pressure chambers, and thereby to cause motor piston movement minimizing the volume of said one pressure chamber in response to the action of said motor piston biasing means.
- 13. A fluid pressure actuated motor comprising a housing, a motor piston movable reciprocally in said housing through a given distance and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, said motor piston including an output portion, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, means including an element operably connected to said output portion of said motor piston and movable reciprocally through said given distance for pumping oil in response to reciprocation of said element, said oil pumping means including means for varying the output thereof notwithstanding the reciprocation of said element through said given distance.
- 14. A fluid pressure actuated motor comprising a housing, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, said motor piston including an output portion, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, means for pumping fuel including a reciprocally movable member operably connected to said output portion of said motor piston, and a variable volume fuel pumping chamber defined in part by said movable member, and means for pumping oil including a reciprocally movable element operably connected to said output portion of said motor piston, and a variable volume oil pumping chamber defined in part by said movable element, said motor piston, said member, and said element constituting an integral component.
- 15. A fluid pressure actuated motor in accordance with claim 14 wherein said oil pumping means includes oil discharge means including a valved bore extending in said component between said oil pumping chamber and said fuel pumping chamber.
- 16. A fluid pressure actuated motor comprising housing, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, said means for creating a pressure differential between said high and low pressure chambers comprising means permitting flow from said other pressure chamber and preventing flow to said other pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, means responsive to motor piston movement minimizing the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber.
- 17. A combined fuel and oil pump comprising means including a reciprocally movable member for pumping fuel in response to reciprocation of said member, means including a reciprocally movable element for pumping oil in response to reciprocation of said element, and motor means connected to said member and to said element and responsive to a source alternating relatively high and low pressures for effecting reciprocation of said member and said element at a frequency less than the frequency of the alternation of the relatively high and low pressures.
- 18. A combined fuel and oil pump in accordance with claim 17 wherein said motor means includes a movable piston, wherein said fuel pumping means includes a variable volume fuel pumping chamber defined in part by said movable member, wherein said oil pumping means includes a variable volume oil pumping chamber defined in part by said movable element and wherein said motor piston, said member and said element constitute an integral component.
- 19. A combined fuel and oil pump in accordance with claim 18 wherein said oil pumping means includes oil discharge means including a valved bore extending in said component between said oil pumping chamber and said fuel pumping chamber.
- 20. A combined fuel and oil pump in accordance with claim 17 wherein said oil pumping means, said fuel pumping means, and said motor means form parts of a single housing.
- 21. A combined fuel and oil pump in accordance with claim 17 wherein said fuel pumping means includes a variable volume pumping chamber defined in part by said movable member and wherein said oil pumping means includes discharge means communicating with said variable volume fuel pumping chamber.
- 22. A combined fuel and oil pump in accordance with claim 17 wherein said movable element reciprocates through a given distance, and wherein said oil pumping means includes means for varying the output thereof notwithstanding the reciprocation of said element through said given distance.
- 23. A combined fuel and oil pump in accordance with claim 17 wherein said motor means comprises a housing, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of said high pressure chamber and maximizing the volume of said low pressure chamber, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said low pressure chamber and maximizing the volume of said high pressure chamber, means responsive to motor piston movement minimizing the volume of said low pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said high pressure chamber and maximizing the volume of said low pressure chamber, and means responsive to motor piston movement minimizing the volume of said high pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creting means and thereby effect displacement of said motor piston in the direction minimizing the volume of said low pressure chamber and maximizing the volume of said high pressure chamber.
- 24. A combined fuel and oil pump in accordance with claim 23 wherein said means for creating a pressure differential between said high and low pressure chambers comprises means adapted to be connected to a source of alternating relatively high and low pressures and including means permitting flow from said low pressure chamber and preventing flow to said low pressure chamber, and means permitting flow to said high pressure chamber and preventing flow from said high pressure chamber.
- 25. A combined fuel and oil pump in accordance with claim 23 wherein said motor also includes pressure relief means connected between said high and low pressure chambers to limit the pressure differential therebetween.
- 26. A combined fuel and oil pump in accordance with claim 23 wherein said motor piston reciprocates through a given distance, wherein said movable element reciprocates through said given distance, and wherein said oil pumping means includes means for varying the output thereof notwithstanding the reciprocation of said element through said given distance.
- 27. A combined fuel and oil pump in accordance with claim 23 wherein said means for establishing and disconnecting communication between said high and low pressure chambers includes a port in said motor piston, a valve member movable relative to said port between open and closed positions, means biasing said valve member away from said port, and means on said housing engageable with said valve member to close said port in response to piston movement minimizing the volume of said high pressure chamber.
- 28. A combined fuel and oil pump in accordance with claim 27 wherein said means responsive to motor piston movement minimizing the volume of said low pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction maximizing the volume of said low pressure chamber and minimizing the volume of said high pressure chamber comprises said port in said motor piston communicating between said low and high pressure chambers, said valve member which is movable between open and closed positions whereby, when said valve member is in said closed position, and a pressure differential is created between said low and high pressure chambers, said motor piston is operable against the action of said motor piston biasing means so as to minimize the volume of said low pressure chamber, said means biasing valve member away from said port, which biasing means is operable, in response to motor piston movement minimizing the volume of said low pressure chamber, to displace said valve member toward said open position so as to permit limited flow from said high pressure chamber to said low pressre chamber when said valve member biasing means exerts a force which is equal to, or slightly greater than, the force resulting from the pressure differential between said low and high pressure chambers, and means in said low pressure chamber operable, in response to motor piston movement minimizing the volume of said low pressure chamber, to define an intermediate communicating with said port and providing resistance to flow from said intermediate chamber to said low pressure chamber so as thereby to effect reduction in the pressure differential between said high pressure chamber and said intermediate chamber and thereby to cause movement of said valve member to said open position, whereby to substantially reduce the pressure differential between said low and high pressure chambers, and thereby to cause motor piston movement minimizing the volume of said high pressure chamber in response to the action of said motor piston biasing means.
- 29. A combined fuel and oil pump in accordance with claim 26 wherein said fuel pumping means includes a variable volume fuel pumping chamber defined in part by said movable member, wherein said oil pumping means includes a variable volume oil pumping chamber defined in part by said movable element, and wherein said motor piston, said member and said element constitute an integral component.
- 30. A combined fuel and oil pump in accordance with claim 24 wherein said oil pumping means includes oil discharge means including a valved bore extending in said component between said oil pumping chamber and said fuel pumping chamber.
- 31. A combined fuel and oil pump comprising means including a reciprocally movable member for pumping fuel in response to reciprocation of said member, means including a reciprocally movable element for pumping oil in response to reciprocation of said element, and motor means connected to said member and to said element and responsive to a source of alternating relatively high and low pressures for effecting reciprocation of said member and said element at a frequency less than the frequency of the alternation of the relatively high and low pressures, said motor means including relatively low and high pressure chambers which inversely vary in volume, and means for creating a pressure differential between said high and low pressure chambers comprising means adapted to be connected to a source of alternating relatively high and low pressures and including means permitting flow from said low pressure chamber and preventing flow to said low pressure chamber, and means permitting flow to said high pressure chamber and preventing flow from said high pressure chamber.
- 32. A combined fuel and oil pump in accordance with claim 31 wherein said oil pumping means includes oil discharge means including a valved bore extending in said component between said oil pumping chamber and said fuel pumping chamber.
- 33. A combined fuel and oil pump in accordance with claim 31 wherein said oil pumping means, said fuel pumping means, and said motor means form parts of a single housing.
- 34. A combined fuel and oil pump in accordance with claim 31 wherein said fuel pumping means includes a variable volume pumping chamber defined in part by said movable member, and wherein said oil pumping means includes discharge means communicating with said variable volume fuel pumping chamber.
- 35. A combined fuel and oil pump in accordance with claim 31 wherein said movable element reciprocates through a given distance, and wherein said oil pumping means includes means for varying the output thereof notwithstanding the reciprocation of said element through said given distance.
- 36. A combined fuel and oil pump in accordance with claim 31 wherein said motor means comprises a housing closed to the atmosphere, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of said high pressure chamber and maximizing the volume of said low pressure chamber, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said low pressure chamber and maximizing the volume of said high pressure chamber, means responsive to motor piston movement minimizing the volume of said low pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said high pressure chamber and maximizing the volume of said low pressure chamber, and means responsive to motor piston movement minimizing the volume of said high pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of a fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said low pressure chamber and maximizing the volume of said high pressure chamber.
- 37. A fluid pressure actuated motor comprising a housing, a motor piston movable reciprocally in said housing and dividing said housing into a relatively low pressure chamber and a relatively high pressure chamber, said motor piston including an output portion, means biasing said motor piston so as to displace said motor piston in the direction minimizing the volume of one of said pressure chambers and maximizing the volume of the other of said pressure chambers, means for creating a fluid pressure differential between said high and low pressure chambers so as to displace said motor piston in the direction minimizing the volume of said other pressure chamber and maximizing the volume of said one pressure chamber, said means for creating a pressure differential between said high and low pressure chambers including means permitting flow from said low pressure chamber and preventing flow to said low pressure chamber, and means permitting flow to said high pressure chamber and preventing flow from said high pressure chamber, means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber, and means responsive to motor piston movement minimizig the volume of said one pressure chamber for discontinuing communication between said high and low pressure chambers so as to thereby permit the creation of fluid pressure differential between said high and low pressure chambers by said fluid pressure differential creating means and thereby effect displacement of said motor piston in the direction minimizing the volume of said other pressure and maximizing the volume of said one pressure chamber.
- 38. A fluid pressure actuated motor in accordance with claim 37 wherein said means for creating a pressure differential between said high and low pressure chambers comprises means adapted to be connected to a source of alternating relatively high and low pressures and including said means permitting flow from said low pressure chamber and preventing flow to said low pressure chamber, and said means permitting flow to said high pressure chamber and preventing flow from said high pressure chamber.
- 39. A fluid pressure actuated motor in accordance with claim 37 and further including pressure relief means connected between said high and low pressure chambers to limit the pressure differential therebetween.
- 40. A fluid pressure actuated motor in accordance with claim 37 and further including oil pumping means including a reciprocally movable element, wherein said motor piston reciprocates through a given distance, wherein said movable element reciprocates through said given distance, and wherein said oil pumping means includes means for varying the output thereof notwithstanding the reciprocation of said element through said given distance.
- 41. A fluid pressure actuated motor in accordance with claim 37 wherein said means for establishing and disconnecting communication between said high and low pressure chambers includes a port in said motor piston, a valve member movable relative to said port between open and closed positions, means biasing said valve member away from said port, and means on said housing engageable with said valve member to close said port in response to piston movement minimizing the volume of said one pressure chamber.
- 42. A fluid pressure actuated motor in accordance with claim 41 wherein said means responsive to motor piston movement minimizing the volume of said other pressure chamber for establishing communication between said low and high pressure chambers so as thereby to reduce the pressure differential between said high and low pressure chambers and thereby permit displacement of said motor piston by said biasing means in the direction minimizing the volume of said one pressure chamber and maximizing the volume of said other pressure chamber comprises said port in said motor piston communicating between said low and high pressure chambers said valve member which is movable between open and closed positions, whereby, when said valve member is in said closed position and a pressure differential is created between said low and high pressure chambers, said motor piston is operable against the action of said motor piston biasing means so as to minimize the volume of said other pressure chamber, and said means biasing said valve member away from said port, said biasing means being operable, in response to motor piston movement minimizing the volume of said other pressure chamber, to displace said valve member toward said open position so as to permit limited flow from said high pressure chamber to said low pressure chamber when said valve member biasing means exerts a force which is equal to, or slightly greater than, the force resulting from the pressure differential between said low and high pressure chambers, and means in said other pressure chamber operable, in response to motor piston movement minimizing the volume of said other pressure chamber, to define an intermediate chamber communicating with said port and providing resistance to flow from said intermediate chamber to said other pressure chamber so as thereby to effect reduction in the pressure differential between said one pressure chamber and said intermediate chamber and thereby to cause movement of said valve member to said open position, whereby to substantially reduce the pressure differential said loW and high pressure chambers, and thereby to cause motor piston movement minimizing the volume of said one pressure chamber in response to the action of said motor piston biasing means.
- 43. A fluid pressure actuated motor in accordance with claim 37 and including fuel pumping means including a reciprocally movable member, and a variable volume fuel pumping chamber defined in part by said movable member, oil pumping means including a reciprocally movable element, and a variable volume oil pumping chamber defined in part by said movable element, and wherein said motor piston, said member, and said element consititute an integral component.
- 44. A fluid pressure actuated motor in accordance with claim 43 wherein said oil pumping means includes oil discharge means including a valved bore extending in said component between said oil pumping chamber and said fuel pumping chamber.
RELATED APPLICATION
This application is a continuation in part of my earlier application Ser. No. 309,558 filed Oct. 8, 1981, now U.S. Pat. No. 4,381,741, and entitled Mechanical Fuel Pressure Operated Device for Supplying a Fuel/Oil Mixture.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
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2139932 |
Feb 1973 |
DEX |
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
309558 |
Oct 1981 |
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Parent |
309558 |
Oct 1981 |
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