JPH0349305U

JPH0349305U -

Info

Publication number: JPH0349305U
Application number: JP10981289U
Authority: JP
Priority date: 1989-09-19
Filing date: 1989-09-19
Publication date: 1991-05-14

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示すオイルポンプ
の断面図、第２図は上記オイルポンプが適用され
るロータリピストンエンジンの一例を示す概略図
、第３図および第４図は上記オイルポンプの動作
説明図、第５図は上記オイルポンプにおけるソレ
ノイドの切換制御のための領域設定の一例を示す
図、第６図は領域設定の別の例を示す図である。１……オイルポンプ、２……ポンプボデイ、４
……デフアレンシヤルプランジヤ（ポンピング用
のプランジヤ）、７，８……ポンプ室、９……サ
ブプランジヤ、１６……ソレノイド。 FIG. 1 is a sectional view of an oil pump showing an embodiment of the present invention, FIG. 2 is a schematic diagram showing an example of a rotary piston engine to which the above oil pump is applied, and FIGS. 3 and 4 are views of the above oil pump. FIG. 5 is a diagram illustrating an example of region setting for switching control of the solenoid in the oil pump, and FIG. 6 is a diagram illustrating another example of region setting. 1...Oil pump, 2...Pump body, 4
... Differential plunger (pumping plunger), 7, 8 ... Pump chamber, 9 ... Sub-plunger, 16 ... Solenoid.

Claims

[Scope of utility model registration request]

In an oil pump for an engine, in which a pumping plunger provided in a pump body rotates and reciprocates in an axial direction to suck in and discharge oil, the pump body has two pump chambers, at least one of which The pump chamber is formed between the pumping plunger and a sub-plunger that is switched between a fixed state and a movable state with respect to the pump body by turning on and off an electromagnetic solenoid, and the sub-plunger is in the fixed state. An oil pump for an engine, characterized in that the volume of the pump chamber changes only occasionally in accordance with the reciprocating movement of the pumping plunger.