Claims
- 1. A fluid pressure unit including a hydraulic motor or hydraulic pump with a stationary housing, the fluid pressure unit comprising,
- a rotor and a stator and a bearing arrangement supporting the rotor with respect to the stator effecting relative rotation of these elements about a geometrical axis and ensuring axial hold in both directions;
- a cam ring fixed to the stator,
- a cylinder block disposed on the rotor adjacent the cam ring and having a plurality of cylinder bores extending radially therein and a plurality of corresponding pistons radially reciprocable in the bores with respect to the geometrical axis, each piston having a roller attached thereto abutting on the cam ring;
- a control device fixed on the stator having a pair of fluid passages therein, one of the fluid passages normally having a fluid pressure higher than the other fluid passage; the control device further having a pair of opposite side faces, one of the faces being adjacent the cylinder block and constituting a distribution face having outlets therein for selective fluid connection of the fluid passages to the cylinder bores as the rotor rotates with respect to the stator;
- a counterpart fastened to the rotor adjacent to and axially spaced from the other side face of the control device so as to define and axially delimit an annular chamber therebetween;
- a shuttle valve operatively interposed between the fluid passages and the annular chamber for maintaining fluid connection between the annular chamber and the passage having the higher fluid pressure;
- whereby upon generation of hydraulic separating forces between the cylinder block and the control device, the hydraulic separating forces are compensated for hydraulically by fluid pressure in the annular chamber.
Priority Claims (1)
Number |
Date |
Country |
Kind |
43 11 997.2 |
Apr 1993 |
DEX |
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Parent Case Info
This application is a division of U.S. application Ser. No. 08/421,768 filed Apr. 14, 1995, which is a continuation of U.S. application Ser. No. 08/225,603, filed Apr. 11, 1994, now U.S. Pat. No. 5,439,356.
US Referenced Citations (12)
Divisions (1)
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Date |
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421768 |
Apr 1995 |
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Continuations (1)
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225603 |
Apr 1994 |
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