Variable displacement oil pump capable of improving volume efficiency

Abstract

The invention discloses a variable displacement oil pump capable of improving volume efficiency, and relates to the technical field of oil pumps. The variable displacement oil pump comprises a pump body, a pump cover, a sliding block and a spring, wherein the sliding block is fixedly connected with a spring pressing block, the two ends of the spring abut against the inner wall face of the pump body and the right side wall face of the spring pressing block correspondingly, a pin shaft is connected between the sliding block and the inner wall of the pump body, a left oil cavity is formed betweenthe outer wall of the sliding block on the left side of the pin shaft and the inner wall of the pump body, the left side of the left oil cavity is sealed, a right oil cavity is formed between the outer wall of the sliding block on the right side of the pin shaft and the inner wall of the pump body, the right side of the right oil cavity is sealed, an oil drainage groove used for communicating theleft oil cavity and the right oil cavity with a high-pressure area of a rotor cavity is formed in the end face of the sliding block, a feedback cavity is formed between the left side wall face of thespring pressing block and the inner wall of the pump body, and the feedback cavity and the left oil cavity are independent of each other. According to the variable displacement oil pump, high-pressure oil can be prevented from leaking into the feedback cavity through a gap to a great extent.

Description

technical field [0001] The invention relates to the technical field of oil pumps, in particular to a variable displacement oil pump capable of improving volumetric efficiency. Background technique [0002] As a kind of oil pump, variable displacement oil pump has been widely used in engine lubrication system. In the traditional variable displacement oil pump, a closed feedback cavity is formed between the slider and the inner wall of the pump body, and the feedback cavity is connected to the external pilot valve. When the oil enters the feedback cavity and forms pressure, the slider will be pushed around The pin shaft swings to achieve the purpose of changing the displacement. [0003] To realize the movement of the slider, there needs to be a gap between its own end face and the cover of the oil pump body. When there is a gap, the high-pressure oil in the pump chamber will easily leak into the above-mentioned feedback chamber through the gap, and then pass through the feed...

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Problems solved by technology

[0003] To realize the movement of the slider, there needs to be a gap between its own end face and the cover of the oil pump body. When there is a gap, the high-pressure oil in the pump chamber will easily leak into the above-mentioned feedback chamber through the gap, and then pass through the feedback chamber. The connected oil circuit is discharged to the outside, which will cause the oil pump to lose part of the flow rate and reduce the volumetric efficiency of the oil pump at the maximum displacement.

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