Claims
- 1. In a radial fluid pump/motor machine of the type having a rotor supported to rotate about an adjustable cam to effect reciprocation of a plurality of radially oriented pistons, said pistons being operably associated with the cam so that, unless constrained, the cam position is moved by hydrostatic force generated by the reciprocation of said pistons, an improved cam adjustment mechanism comprising;
- a rotatable control shaft;
- a control arm supported to turn and coupled with said cam in a manner that the eccentricity between the cam and rotor is adjusted when the control arm is turned;
- a pair of extensible and retractable fluid cylinders coupled with the control arm in a manner to permit the arm to turn in one direction only when one cylinder is extended and the other cylinder is retracted and to permit the arm to turn in the other direction only when said one cylinder is retracted and said other cylinder is extended; and
- hydraulic circuit means operably communicating with fluid in the machine and with said cylinders to permit extension of said one cylinder and retraction of said other cylinder upon selective rotation of said control shaft in one direction and retraction of said one cylinder and extension of said other cylinder upon selective rotation of said control shaft in the opposite direction, said circuit being arranged to restrain said cam against movement in repsonse to forces applied thereto by the pistons except in response to said selective rotation of said control shaft.
- 2. A radial fluid pump/motor machine of the type having a rotor supported to rotate about a cam to effect reciprocation of a plurality of radially oriented pistons;
- means mounting said cam for movement along a path of travel to adjust the amount of reciprocation of said pistons as said rotor is rotated;
- structure operably coupling said piston with said cam whereby the latter is moved along said path of travel responsive to forces imparted to the cam as a result of said reciprocation of the pistons during rotation of the rotor;
- means including a pair of hydraulic cylinders operably coupled with the cam for releasably holding the cam in any selected position along said path of travel; and
- control means operably coupled with said holding means for selectively releasing the latter to permit movement of the cam to any selected position along said path under the influence of said forces, said control means being operable to stop the movement of said cam and to reestablish the holding of the position of the cam at said position by said holding means.
Parent Case Info
cl RELATED APPLICATION
This is a division of applicaiton Ser. No. 165,253, filed Mar. 7, 1988, now U.S. Pat. No. 4,864,916, which is a continuation-in-part of application Ser. No. 907,576, filed Sept. 15, 1986, now U.S. Pat. No. 4,768,422.
US Referenced Citations (16)
Foreign Referenced Citations (1)
Number |
Date |
Country |
51587 |
Feb 1943 |
FRX |
Divisions (1)
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Number |
Date |
Country |
Parent |
165253 |
Mar 1988 |
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Continuation in Parts (1)
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Number |
Date |
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907576 |
Sep 1986 |
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