JPH0330580U

JPH0330580U -

Info

Publication number: JPH0330580U
Application number: JP8986589U
Authority: JP
Priority date: 1989-07-31
Filing date: 1989-07-31
Publication date: 1991-03-26

Description

[Brief explanation of drawings]

第１図および第２図は本考案の一実施例を示し
、第１図はポンプの全体断面図、第２図はシリン
ダ開口部の断面図、第３図は従来例を示すポンプ
の全体断面図である。５１……シリンダブロツク、５１ａ……ポンプ
室、５２……ピストン、５３……斜板、５４……
駆動軸、５５……ポンプケーシング、５５ｂ……
圧力室、５６……吸入孔、５７……逆止弁、５８
……シリンダ、６１……コイルバネ、６３……ス
ラスト板、６４……流体吸入管、６６……流体吐
出流路、６７……リターン流路、７１……絞り、
７２……リリーフ弁、７３……タンク。 Figures 1 and 2 show an embodiment of the present invention, Figure 1 is an overall sectional view of the pump, Figure 2 is a sectional view of the cylinder opening, and Figure 3 is an overall sectional view of the pump showing a conventional example. It is a diagram. 51... Cylinder block, 51a... Pump chamber, 52... Piston, 53... Swash plate, 54...
Drive shaft, 55... Pump casing, 55b...
Pressure chamber, 56... Suction hole, 57... Check valve, 58
... Cylinder, 61 ... Coil spring, 63 ... Thrust plate, 64 ... Fluid suction pipe, 66 ... Fluid discharge flow path, 67 ... Return flow path, 71 ... Throttle,
72...Relief valve, 73...Tank.

Claims

[Scope of utility model registration request]

A swash plate whose center almost coincides with the axial center of the drive shaft and is inclined with respect to the axial center, and a cylinder block that opposes the swash plate and is orthogonal to the axial center, A plurality of cylinder blocks are formed parallel to the swash plate, and each cylinder is provided with a piston that can move linearly, one end of each piston is brought into slidable contact with the plate surface of the swash plate, and is connected to the drive shaft. Relative rotation between one of the swash plate and cylinder block, which are integrally rotatably connected, and the other, which is stationary, moves each piston back and forth, causing fluid to flow into the pump chamber formed in the cylinder at the other end of each piston. In an axial piston pump that periodically sucks in and discharges fluid, a suction hole for sucking fluid into the piston chamber is provided on the outer periphery of one end of each of the pistons that is exposed outside the cylinder by movement toward the swash plate. A pressure chamber is formed between the swash plate and the end wall of the pump casing by bringing the outer periphery of the plate into close contact with the inner wall of the pump casing so that it can slide freely, and a part of the fluid discharge passage leading to the pump chamber is connected in series with the throttle. The pressure on the downstream side of the throttle is introduced into the pressure chamber by returning through the connected relief valve, and the difference between the contact force of the hydraulic pressure in the pump chamber acting on the swash plate via the piston and the internal pressure of the pressure chamber. An axial piston pump in which the swash plate is moved by.