JPH0432272U

JPH0432272U -

Info

Publication number: JPH0432272U
Application number: JP7460490U
Authority: JP
Priority date: 1990-07-12
Filing date: 1990-07-12
Publication date: 1992-03-16
Anticipated expiration: 2004-09-07
Also published as: JPH0634625Y2

Description

[Brief explanation of the drawing]

第１〜６図は本考案を具体化した一実施例を示
すものであつて、第１図はフロントエンドカバー
をリヤ側から見た図、第２図は可変容量型斜板式
ピストンポンプの縦断面図、第３図は第１図の
−線断面図、第４図は斜板をフロント側から見
た図、第５図は第４図の−線断面図、第６図
は第２図の−線断面図、第７図は従来装置の
概略断面図である。フロントエンドカバー……２、駆動軸……４、
弁板……７、吸入／吐出ポート……７ａ，７ｂ、
シリンダブロツク……８、シリンダボア……９、
斜板……１１、ピストン押圧面……１１ａ、摺動
面……１１ｄ、ピストン……１２、支持体……１
７、収容部……１８、支承面……１８ａ、傾斜角
変更手段を構成する制御シリンダ１９，２０及び
方向制御弁……３２、油ポケツト……２２ａ，２
２ｂ、連通溝……２３ａ，２３ｂ、油供給溝……
２４ａ，２４ｂ、油供給路……２５、通路……２
６ａ，２６ｂ、切替弁……２９、操作レバー……
３２ａ。 Figures 1 to 6 show an embodiment of the present invention, in which Figure 1 is a view of the front end cover viewed from the rear side, and Figure 2 is a longitudinal cross-section of a variable displacement swash plate type piston pump. 3 is a sectional view taken along the - line in Fig. 1, Fig. 4 is a view of the swash plate seen from the front side, Fig. 5 is a sectional view taken along the - line in Fig. 4, and Fig. 6 is a sectional view taken along the - line in Fig. 2. FIG. 7 is a schematic sectional view of the conventional device. Front end cover...2, Drive shaft...4,
Valve plate...7, Suction/discharge port...7a, 7b,
Cylinder block...8, Cylinder bore...9,
Swash plate...11, Piston pressing surface...11a, Sliding surface...11d, Piston...12, Support body...1
7. Accommodating portion...18, Supporting surface...18a, Control cylinders 19, 20 constituting the inclination angle changing means and direction control valve...32, Oil pocket...22a, 2
2b, communication groove...23a, 23b, oil supply groove...
24a, 24b, oil supply path...25, passage...2
6a, 26b, switching valve...29, operating lever...
32a.

Claims

[Scope of utility model registration request]

The piston is equipped with a piston that can reciprocate within a plurality of cylinder bores formed in a cylinder block that rotates together with the drive shaft, and is fixed at a predetermined position so that it can slide against the end face of the cylinder block. An arc-shaped suction/discharge port is formed in the valve plate, a swash plate is swingably supported on a support having a semi-cylindrical housing portion, and a piston pressing surface of the swash plate is moved from a position perpendicular to the drive shaft. In a swash plate type piston pump which is disposed so as to be tiltable on both front and rear sides and is provided with an inclination angle changing means for changing the inclination angle of the swash plate, two oil pockets are provided on the sliding surface of the swash plate with the accommodation portion. It is formed to extend in the direction of movement of the sliding surface with the drive shaft in between, and a communication groove that communicates with each oil pocket is formed to protrude to the side of the oil pocket, and a piston is provided on the support surface of the housing part. An oil supply groove that can communicate with the communication groove that communicates with the oil pocket corresponding to the discharge stroke side when the pressing surface is tilted forward or backward from a position perpendicular to the drive shaft is formed, and each oil supply groove is connected to the communication groove. A variable displacement swash plate type piston pump that communicates with one oil supply path to which discharge pressure is supplied.