油圧ピストンポンプ・モータ

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic piston pump motor capable of improving the lubricity of a pad face. <P>SOLUTION: This hydraulic piston pump motor includes a plurality of pistons reciprocating with respect to a rotating cylinder block, a volume chamber in the cylinder block that expands and contracts by the pistons, and a valve plate for switching supply and discharge of operating oil to/from the volume chamber. Each of sliding faces 20, 30 on which the cylinder block and the valve plate 15 slide with each other includes a seal land face 21 for sealing flow of the operating oil to one of the sliding faces 20, 30, and a pad face 22 sliding on the other of the sliding faces 20, 30 on the outside of the seal land face 21. A recessed oil reservoir part 45 is formed on the sliding face 30 sliding on the pad face 22. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

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