JPS63156476U

JPS63156476U -

Info

Publication number: JPS63156476U
Application number: JP4870087U
Authority: JP
Priority date: 1987-03-31
Filing date: 1987-03-31
Publication date: 1988-10-13
Anticipated expiration: 2002-03-31
Also published as: JPH0717822Y2

Description

[Brief explanation of drawings]

第１図は本考案のピストンポンプおよびモータ
の一実施例を示す図で、第１図ａはバルブプレー
トのＢＤＶ近傍の展開図、第１図ｂはＢＤＶ近傍
におけるシリンダ内圧の状況を示す図、第１図ｃ
はＢＤＶ近傍におけるシリンダポートからの流出
量の状況を示す図である。第２図はアキシアルピ
ストンポンプおよびモータの縦断面図、第３図は
従来のアキシアルピストンポンプおよびモータに
おけるバルブプレートの平面図、第４図ａは第３
図のＢＤＶ近傍の展開図、第４図ｂは第４図ａに
おけるシリンダ内圧の状況を示す図、第４図ｃは
第４図ａにおけるシリンダポートからの流出量の
状況を示す図である。１……シリンダブロツク、２……シリンダ、３
……ピストン、４……シリンダブロツクの端面、
５……バルブプレート、６……スプライン、７…
…軸、８……スリツパ、９……斜板、１０……シ
リンダポート、１３……吸入ポート、１４……吐
出ポート、１５，２６……高圧コンジツト、１６
……高圧ノツチ、１７……低圧コンジツト、１８
……低圧ノツチ、２０……蓄圧器、２１，２１…
…軸受、２３……絞り、２５……開口。 Fig. 1 is a diagram showing an embodiment of the piston pump and motor of the present invention, Fig. 1a is a developed view of the valve plate near the BDV, Fig. 1b is a diagram showing the situation of the cylinder internal pressure near the BDV, Figure 1c
2 is a diagram showing the situation of the amount of outflow from the cylinder port in the vicinity of the BDV. Fig. 2 is a vertical cross-sectional view of an axial piston pump and motor, Fig. 3 is a plan view of a valve plate in a conventional axial piston pump and motor, and Fig. 4a is a longitudinal sectional view of an axial piston pump and motor.
FIG. 4b is a diagram showing the situation of the cylinder internal pressure in FIG. 4a, and FIG. 4c is a diagram showing the situation of the outflow amount from the cylinder port in FIG. 4a. 1...Cylinder block, 2...Cylinder, 3
... Piston, 4 ... End face of cylinder block,
5... Valve plate, 6... Spline, 7...
...shaft, 8 ... slipper, 9 ... swash plate, 10 ... cylinder port, 13 ... suction port, 14 ... discharge port, 15, 26 ... high pressure conduit, 16
...High pressure notch, 17...Low pressure conduit, 18
...Low pressure notch, 20...Pressure accumulator, 21, 21...
...Bearing, 23...Aperture, 25...Aperture.

Claims

[Scope of utility model registration request]

A piston pump configured such that a piston reciprocates within a plurality of axial cylinders formed in a cylinder block that contacts a valve plate having a suction port and a discharge port, and that rotates while engaging with a shaft. A piston pump and a motor, characterized in that a conduit opening in a sliding surface between a suction port and a discharge port near the bottom dead center of the valve plate is communicated with a pressure accumulator.