| 摘要 |
A problem with hydraulic displacement units of the axial piston type is the cavitation which occurs at the porting face of the cylinder block due to the conventional use of a bearing material which, because of its very nature, has a tendency to erode. A solution to this problem is provided by a hydraulic axial displacement pump or motor which comprises a housing (10), a rotatable cylinder block (18) in the housing (10) and including a plurality of bores (30), a piston (35) in each of the bores (30) and reciprocable therein upon rotation of the cylinder block (18), a valve member (12) having inlet and outlet ports (34) and in abutment with the cylinder block (18) wherein each of the bores (30) has a port (31) opening to the ports (34) in the valve member (12) to establish fluid communication therewith, and a porting face (63) on the cylinder block (18) about the ports to the bores (30) and abutting the valve member or endcap (12) formed of a hard, erosion resistant material, and at least one stabilization foot (65) extending from the cylinder block (18) toward the valve member (12) and formed of a bearing material. This configuration results in a pump or motor which avoids cavitation caused erosion in the porting face which in turn results in a longer life and more efficient operation of the pump or motor.
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