| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hydraulic power unit for a variable displacement pump. SOLUTION: This hydraulic power unit has a housing, a piston block rotatable around a rotary shaft, and a bore for a servo piston fitting the servo piston for a reciprocating motion and to be in parallel to the rotary shaft of the piston block. The housing and the bore and respectively provided with an opening end adjacent to each other. One cover is mounted in the housing, and in this way, the opening ends of the housing and the bore are closed.</p> |
