Claims
- 1. A marine propulsion device including a member adapted to be attached to a boat hull, a propulsion assembly pivotally connected to said member for vertical swinging movement when said member is attached to the boat hull, a tilt hydraulic cylinder-piston assembly connected between said member and said propulsion assembly and including a tilt cylinder having opposed first and second ends, a trim hydraulic cylinder-piston assembly including a trim cylinder fixed relative to one of said member and said propulsion assembly, having opposed first and second ends, and having therein a reciprocably movable trim piston having a piston rod extending through one of said ends of said trim cylinder and adapted for releasable engagement with the other of said member and said propulsion assembly, a reversible pump including first and second ports, said pump being operative, when said pump is operating in a first mode, to supply hydraulic fluid under pressure at said first port and to provide suction at said second port and being operative, when said pump is operating in a second mode, to supply hydraulic fluid under pressure at said second port and to provide suction at said first port, first conduit means communicating between said first end of said tilt cylinder and said first pump port and including a first valve biased so as to releasably prevent flow from said first end of said tilt cylinder to said first pump port and so as to permit fluid flow from said first pump port to said first end of said tilt cylinder in response to the presence of hydraulic fluid under pressure at said first pump port, second conduit means communicating between said first end of said trim cylinder and said first pump port independently of said first valve means, said second conduit means including a second valve biased so as to releasably prevent flow from said first end of said trim cylinder to said first port and so as to permit fluid flow from said first pump port to said first end of said trim cylinder in response to the presence of hydraulic fluid under pressure at said first pump port and independently of said first valve means, and third conduit means communicating between said second pump port and said second ends of said trim cylinder and said tilt cylinder.
- 2. A marine propulsion device in accordance with claim 1 wherein said first valve includes a valve seat, a valve member movable relative to said valve seat between an open position permitting fluid flow through said first valve and a closed position preventing fluid flow through said first valve, and a spring biasing said valve member toward said closed position, and wherein said means for actuating said first valve comprises a housing having therein a cylinder with a first end communicating with said second pump port, a second end communicating with said first conduit means intermediate said first valve and said first pump port, and a piston located in said cylinder intermediate the ends thereof and being movable in said cylinder relative to a position engaging said valve member to displace said valve member to said open position in response to the presence of hydraulic fluid under pressure at said first cylinder end.
- 3. A marine propulsion device in accordance with claim 2 wherein said housing includes a portion of said first conduit means including said valve seat and wherein said valve member and said spring are located in said housing.
- 4. A marine propulsion device in accordance with claim 1 and further including means communicating with said second pump port for actuating said first valve against the bias thereof and in response to the presence of hydraulic fluid under pressure at said second pump port so as to permit hydraulic fluid flow from said first end of said tilt cylinder to said first pump port.
- 5. A marine propulsion device including a member adapted to be attached to a boat hull, a propulsion assembly pivotally connected to said member for vertical swinging movement when said member is attached to the boat hull, a tilt hydraulic cylinder-piston assembly connected between said member and said propulsion assembly and including a tilt cylinder having opposed first and second ends, a trim hydraulic cylinder-piston assembly including a trim cylinder fixed relative to one of said member and said propulsion assembly, having opposed first and second ends, and having therein a reciprocably movable trim piston having a piston rod extending through one of said ends of said trim cylinder and adapted for releasable engagement with the other of said member and said propulsion assembly, a reversible pump including first and second ports, said pump being operative, when said pump is operating in a first mode, to supply hydraulic fluid under pressure at said first port and to provide suction at said second port and being operative, when said pump is operating in a second mode, to supply hydraulic fluid under pressure at said second port and to provide suction at said first port, first conduit means communicating between said first end of said tilt cylinder and said first pump port and including a first valve biased so as to releasably prevent flow from said first end of said tilt cylinder to said first pump port and so as to permit fluid flow from said first pump port to said first end of said tilt cylinder in response to the presence of hydraulic fluid under pressure at said first pump port, second conduit means communicating between said first end of said trim cylinder and said first pump port, third conduit means communicating between said second pump port and said second ends of said trim cylinder and said tilt cylinder, means communicating with said second pump port for actuating said first valve against the bias thereof and in response to the presence of hydraulic fluid under pressure at said second pump port so as to permit hydraulic fluid flow from said first end of said tilt cylinder to said first pump port, a shuttle valve housing having a first end communicating between said first pump port and said first and second conduit means, and a second end communicating between said second pump port and said third conduit means, a second valve which is normally closed and which communicates between said first end of sad shuttle valve housing and said second conduit means and is arranged to releasably prevent fluid flow therethrough to and from said first end of said shuttle valve housing, and a third valve which is normally closed and which communicates between said second end of said shuttle valve housing and said third conduit means and which is arranged to releasably prevent flow therethrough to and from said second end of said shuttle valve housing.
- 6. A marine propulsion device in accordance with claim 5 and further including a shuttle piston located in said shuttle valve housing and movable relative to a centered position located midway between said first and second ends of said shuttle valve housing, a first end position located adjacent to said first end of said shuttle valve housing and a second end position located adjacent to said second end of said shuttle valve housing, means on said piston opening said second valve when said piston is in said first end position, and means on said piston opening said third valve when said piston is in said second end position.
- 7. A marine propulsion device in accordance with claim 5 wherein said third valve includes means biasing said third valve toward the normally closed condition, and further including a relief valve which is normally closed and which communicates with said second end of said shuttle valve housing and with a sump, said relief valve including means biasing said relief valve toward the normally closed condition, said biasing means of said relief valve having greater resistance than said biasing means of said third valve.
- 8. A marine propulsion device in accordance with claim 1 and furhter including a normally closed relief valve communicating between said first conduit means and a sump and arranged to afford fluid flow from said first conduit means in the event of a pressure therein above a predetermined level.
- 9. A marine propulsion device including a member adapted to be attached to a boat hull, a propulsion assembly pivotally connected to said member for vertical swinging movement when said member is attached to the boat hull, a tilt hydraulic cylinder-piston assembly connected between said member and said propulsion assembly and including a tilt cylinder having opposed first and second ends, a trim hydraulic cylinder-piston assembly including a trim cylinder fixed relative to one of said member and said propulsion assembly, having opposed first and second ends, and having therein a reciprocably movable trim piston having a piston rod extending through one of said ends of said trim cylinder and adapted for releasable engagement with the other of said member and said propulsion assembly, a reversible pump including first and second ports, said pump being operative, when said pump is operating in a first mode, to supply hydraulic fluid under pressure at said first port and to provide suction at said second port and being operative, when said pump is operating in a second mode, to supply hydraulic fluid under pressure at said second port and to provide suction at said first port, first conduit means communicating between said first end of said tilt cylinder and said first pump port and including a first valve biased so as to releasably prevent flow from said first end of said tilt cylinder to said first pump port and so as to permit fluid flow from said first pump port to said first end of said tilt cylinder in response to the presence of hydraulic fluid under pressure at said first pump port, second conduit means communicating between said first end of said trim cylinder and said first pump port, third conduit means communicating between said second pump port and said second ends of said trim cylinder and said tilt cylinder, means communicating with said second pump port for actuating said first valve against the bias thereof and in response to the presence of hydraulic fluid under pressure at said second pump port so as to permit hydraulic fluid flow from said first end of said tilt cylinder to said first pump port, additional conduit means communicating between said first and second ends of said tilt cylinder and including means operative for temporarily affording fluid flow from said first end of said tilt cylinder to said second end of said tilt cylinder in response to the generation of relatively high pressure adjacent said second end of said tilt cylinder occurring incident to the striking of an underwater obstacle.
- 10. A marine propulsion device in accordance with claim 9 wherein said means for temporarily affording fluid flow from said first end of said tilt cylinder to said second end of said tilt cylinder comprises a by-pass valve communicating between said first end of said tilt cylinder and said second end of said tilt cylinder, said by-pass valve being biased to releasably prevent fluid flow therethrough from said first end of said tilt cylinder, an actuating valve communicating with said second end of said tilt cylinder and biased to releasably prevent fluid flow therethrough from said second end of said tilt cylinder, and means operative in response to fluid flow through said actuating valve for temporarily opening said by-pass valve to afford hydraulic fluid flow from said first end of said tilt cylinder to said second end of said tilt cylinder.
- 11. A marine propulsion device in accordance with claim 9 wherein said by-pass valve communicates with said second end of said tilt cylinder through conduit means including valve means preventing flow from said second end of said tilt cylinder to said by-pass valve.
- 12. A marine propulsion device in accordance with claim 11 wherein said conduit means includes a reservoir between said by-pass valve and said valve means.
- 13. A marine propulsion device including a member adapted to be attached to a boat hull, a propulsion assembly pivotally connected to said member for vertical swinging movement when said member is attached to the boat hull, a tilt hydraulic cylinder-piston assembly connected between said member and said propulsion assembly and including a tilt cylinder having opposed first and second ends, a trim hydraulic cylinder-piston assembly including a trim cylinder fixed relative to one of said member and said propulsion assembly, having opposed first and second ends, and having therein a reciprocably movable trim piston having a piston rod extending through one of said ends of said trim cylinder and adapted for releasable engagement with the other of said member and said propulsion assembly, a reversible pump including first and second ports, said pump being operative, when said pump is operating in a first mode, to supply hydraulic fluid under pressure at said first port and to provide suction at said second port and being operative, when said pump is operating in a second mode, to supply hydraulic fluid under pressure at said second port and to provide suction at said first port, a sump communicating with said first and second ports, first conduit means communicating between said first end of said tilt cylinder and said first pump port and including a first valve biased so as to releasably prevent flow from said first end of said tilt cylinder to said first pump port and so as to permit fluid flow from said first pump port to said first end of said tilt cylinder in response to the presence of hydraulic fluid under pressure at said first pump port, second conduit means communicating between said first end of said trim cylinder and said first pump port independently of said first valve means, third conduit means communicating between said second pump port and said second ends of said trim cylinder and said tilt cylinder independently of said sump to permit pressure fluid flow from said second pump port to said second ends of said trim and tilt cylinders, and means communicating with said second pump port for actuating said first valve against the bias thereof and in response to the presence of hydraulic fluid under pressure at said second pump port so as to permit hydraulic fluid flow from said first end of said tilt cylinder to said first pump port.
- 14. A marine propulsion device in accordance with claim 13 wherein said first valve includes a valve seat, a valve member movable relative to said valve seat between an open position permitting fluid flow through said first valve and a closed position preventing fluid flow through said first valve, and a spring biasing said valve member toward said closed position, and wherein said means for actuating said first valve comprises a housing having therein a cylinder with a first end communicating with said second pump port, a second end communicating with said first conduit means intermediate said first valve and said first pump port, and a piston located in said cylinder intermediate the ends thereof and being movable in said cylinder relative to a position engaging said valve member to displace said valve member to said open position in response to the presence of hydraulic fluid under pressure at said first cylinder end.
- 15. A marine propulsion device in accordance with claim 14 wherein said housing includes a portion of said first conduit means including said valve seat and wherein said valve member and said spring are located in said housing.
- 16. A marine propulsion device in accordance with claim 13 wherein said first and second conduit means communicate with said first pump port independently of each other.
- 17. A marine propulsion device in accordance with claim 13 and further including a normally closed relief valve communicating between said first conduit means and said sump and arranged to afford fluid flow from said first conduit means in the event of a pressure therein above a predetermined level.
- 18. A marine propulsion device including a member adapted to be attached to a boat hull, a propulsion assembly pivotally connected to said member for vertical swinging movement when said member is attached to the boat hull, a tilt hydraulic cylinder-piston assembly connected between said member and said propulsion assembly and including a tilt cylinder having opposed first and second ends, a trim hydraulic cylinder-piston assembly including a trim cylinder fixed relative to one of said member and said propulsion assembly, having opposed first and second ends, and having therein a reciprocably movable trim piston having a piston rod extending through one of said ends of said trim cylinder and adapted for releasable engagement with the other of said member and said propulsion assembly, a reversible pump including first and second ports, said pump being operative, when said pump is operating in a first mode, to supply hydraulic fluid under pressure at said first port and to provide suction at said second port and being operative, when said pump is operating in a second mode, to supply hydraulic fluid under pressure at said second port and to provide suction at said first port, first conduit means communicating between said first end of said tilt cylinder and said first pump port and including a first valve biased so as to releasably prevent flow from said first end of said tilt cylinder to said first pump port and so as to permit fluid flow from said first pump port to said first end of said tilt cylinder in response to the presence of hydraulic fluid under pressure at said first pump port, second conduit means communicating between said first end of said trim cylinder and said first pump port and including a second valve biased so as to releasably prevent flow from said first end of said trim cylinder to said first pump port and so as to permit fluid flow from said first pump port to said first end of said trim cylinder in response to the presence of hydraulic fluid under pressure at said first pump port, third conduit means communicating between said second pump port and said second ends of said trim cylinder and said tilt cylinder, first means communicating with said second pump port for actuating said first valve against the bias thereof and in response to the presence of hydraulic fluid under pressure at said second pump port so as to permit hydraulic fluid flow from said first end of said tilt cylinder to said first pump port, and second means communicating with said second pump port for actuating said second valve against the bias thereof and in response to the presence of hydraulic fluid under pressure at said second pump port so as to permit hydraulic fluid flow from said first end of said trim cylinder to said first pump port.
- 19. A marine propulsion device in accordance with claim 18 wherein said first valve includes a valve seat, a valve member movable relative to said valve seat between an open position permitting fluid flow through said first valve and a closed position preventing fluid flow through said first valve, and a spring biasing said valve member toward said closed position, and wherein said first means for actuating said first valve comprises a housing having therein a cylinder with a first end communicating with said second pump port, a second end communicating with said first conduit means intermediate said first valve and said first pump port, and a piston located in said cylinder intermediate the ends thereof and being movable in said cylinder relative to a position engaging said valve member to displace said valve member to said open position in response to the presence of hydraulic fluid under pressure at said first cylinder end.
- 20. A marine propulsion device in accordance with claim 19 wherein said housing includes a portion of said first conduit means including said valve seat and wherein said valve member and said spring are located in said housing.
- 21. A marine propulsion device in accordance with claim 19 wherein said second valve includes a valve seat, a valve member movable relative to said valve seat between an open position permitting fluid flow through said second valve and a closed position preventing fluid flow through said second valve, and a spring biasing said valve member toward said closed position, and wherein said second means for actuating said second valve comprises a housing having therein a cylinder with a first end communicating with said second pump port, a second end communicating with said second conduit means intermediate said second valve and said first pump port, and a piston located in said cylinder intermediate the ends thereof and being movable in said cylinder relative to a position engaging said valve member to displace said valve member to said open position in response to the presence of hydraulic fluid under pressure at said first cylinder end.
- 22. A marine propulsion device in accordance with claim 21 wherein said housing includes a portion of said second conduit means including said valve seat and wherein said valve member and said spring are located in said housing.
- 23. A marine propulsion device in accordance with claim 19 wherein said first and second conduit means communicate with said first pump port independently of each other.
- 24. A marine propulsion device in accordance with claim 19 and further including a normally closed relief valve communicating between said first conduit means and a sump and arranged to afford fluid flow from said first conduit means in the event of a pressure therein above a predetermined level.
RELATED APPLICATION
This application is a continuation-in-part of my co-pending application Ser. No. 571,077, filed Apr. 24, 1975, now abandoned.
US Referenced Citations (3)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
571077 |
Apr 1975 |
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