Patent ID: 9726158
Date: 2017-08-08
CPC Classifications: F04B

Claim:
1. A swash plate pump having a discharge capacity changeable according to a load pressure, the swash plate pump comprising: a plurality of pistons; a cylinder block including a plurality of cylinders for housing the pistons; a swash plate for reciprocating the pistons to expand and contract volume chambers of the cylinders with a rotation of the cylinder block; a biasing mechanism for biasing the swash plate in a direction to increase a tilting angle of the swash plate; a first control pin for driving the swash plate in a direction to reduce the tilting angle according to a first load pressure; a second control pin for driving the swash plate in a direction to reduce the tilting angle according to a second load pressure, the second control pin being connected with the first control pin in series; and a casing for housing the cylinder block, the pistons, the swash plate, the biasing mechanism and the first and second control pins, wherein the casing includes a first pressure chamber to which the first load pressure is introduced is defined between the first control pin and the small-diameter hole; a second pressure chamber to which the second load pressure is introduced is defined between the second control pin and the large-diameter hole; the small-diameter hole and the large-diameter hole are formed by machining from a side of the pump housing at which the pump cover is mounted before the pump cover is mounted on the pump housing; the first control pin and the second control pin are inserted into the small-diameter hole and the large-diameter hole, respectively, from the side of the pump housing at which the pump cover is mounted, before the pump cover is mounted on the pump housing; and the first pressure chamber is in fluid communication with a discharge pressure of a sub pump.