JPH0466367U

JPH0466367U -

Info

Publication number: JPH0466367U
Application number: JP10800290U
Authority: JP
Priority date: 1990-10-17
Filing date: 1990-10-17
Publication date: 1992-06-11

Description

[Brief explanation of the drawing]

図面は本考案の実施例を示し、第１図は可変式
ポンプ・モータの全体断面図、第２図はロツカー
カム支持部の分解斜視図、第３図は円弧状突起と
円弧状凹溝の形状説明図である。１はケース、１ａは底壁、４はシリンダーブロ
ツク、６は軸、１１はシリンダー孔、１２はピス
トン、１３はシリンダー室、１５は弁板、１６は
ピストンシユー、１７はシユーリテーナ、１８は
ロツカーカム、３１は前面、３２は後面、３３，
３４は第１・第２ストツパ面、３５は円弧状突起
、３６は円弧状凹溝、３６ａは底部、３６ｂは口
元部。 The drawings show an embodiment of the present invention; Fig. 1 is an overall sectional view of a variable pump/motor, Fig. 2 is an exploded perspective view of a rocker cam support, and Fig. 3 is a diagram showing the shapes of an arcuate protrusion and an arcuate groove. It is an explanatory diagram. 1 is a case, 1a is a bottom wall, 4 is a cylinder block, 6 is a shaft, 11 is a cylinder hole, 12 is a piston, 13 is a cylinder chamber, 15 is a valve plate, 16 is a piston shoe, 17 is a shoe retainer, 18 is a rocker cam, 31 is the front, 32 is the rear, 33,
34 is a first and second stopper surface, 35 is an arcuate projection, 36 is an arcuate groove, 36a is a bottom portion, and 36b is a mouth portion.

Claims

[Claims for Utility Model Registration] A cylinder block 4 is rotatably supported together with a shaft 6 in a case 1, and a piston 12 is fitted into a cylinder hole 11 of the cylinder block 4 to form a cylinder chamber 13. In the variable pump motor, the chamber 13 is sequentially communicated with the high pressure port and the low pressure port of the valve plate 15, and the piston shoe 16 connected to the piston 12 is slidably pressed by the shoe retainer 17 along the front surface of the rocker cam 18. A plurality of stopper surfaces and arcuate protrusions 35 having different angles are provided on the rear surface 32 of the rocker cam 18, an arcuate groove 36 is formed in the bottom wall 1a of the case 1, and the bottom wall 1a is used as a stopper. The groove 36 has a two-step shape with a bottom portion 36a having a radius _R1 and a mouth portion 36b having a radius _R3 , and the relationship between the radii _R1 and _R3 and the radius _R2 of the arcuate protrusion 35 is R1 _. A rocker cam support structure for a variable pump/motor characterized by <R ₂ < R ₃ .