Patent ID: 7857606
Filing Date: 2010-12-28
Classification: F04C

Abstract:
1. A variable displacement pump for pressurization of fuel/lubricant oil to be supplied into an engine, comprising: a pump body having upper and lower major surfaces opposite to each other along a rotating axis, said upper major surface having an internal rotary member which is adapted to be rotated with the rotary shaft, and which has an outer peripheral contour; an external rotary member which is disposed to surround said internal rotary member, and which has inner and outer wall surfaces radially opposite to each other, said inner wall surface having an inner peripheral contour which is dragged by said outer peripheral contour to permit revolution of said external rotary member with said internal rotary member, and which is configured to cooperate with said outer peripheral contour to define a space with a variable volume such that, during each revolution of said internal rotary member in the counterclockwise direction, fuel/lubricant oil is taken up from said first pool by virtue of sweeping of said space over said first pool, and is subsequently delivered as pressurized fuel/lubricant oil to said second pool, and such that an increase in speed of revolution of said internal rotary member results in delivery of an increased volume of the pressurized fuel/lubricant oil to said second pool, thereby generating a force of expansion in said second pool; a control slider including a biasing member which is disposed at an opposite side of said actuated tooth relative to said second pool to bias said actuated tooth away from the expanded position.