Variable displacement oil pump capable of avoiding temperature rise and pressure drop

Abstract

A variable displacement oil pump capable of avoiding temperature rise and pressure drop relates to the technical field of oil pumps and comprises a pump body, a pump cover, a sliding block arranged in the pump body, a rotor, a pump shaft and the like, the front side of the sliding block is connected with the inner wall of the pump body through a rotating pin, the rear side of the sliding block is connected with the pump body through a spring, and a feedback cavity is formed between the left side face of the sliding block and the inner wall of the pump body. A low-pressure oil suction cavity is formed in the right side of the sliding block, a compensation oil channel is connected between the feedback cavity and the low-pressure oil suction cavity, a compensation pin is installed in the compensation oil channel in a clearance mode, and the compensation pin is used for guiding feedback oil to pass through the clearance between the side wall face of the compensation pin and the inner wall face of the compensation oil channel. Oil liquid in the feedback cavity is distributed, and oil liquid leaking into the feedback cavity from a high-pressure oil discharging cavity in the pump cavity under the high-temperature working condition is compensated and balanced, so that the stability of pressure adjustment of the whole system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of oil pumps, in particular to a variable displacement oil pump which can avoid temperature rise and pressure drop. Background technique [0002] The design requirement of the variable displacement oil pump is to allow the oil in the feedback oil circuit of the main oil passage controlled by the pilot valve to enter the feedback oil action chamber and form pressure, and then push the slider to realize variable displacement. However, in actual situations, due to the gap between the slider and the pump chamber, it is inevitable that the oil in the feedback chamber will leak into the low-pressure oil suction chamber, and the oil in the high-pressure oil discharge chamber will leak into the feedback chamber, especially Under high temperature conditions, as the oil viscosity decreases, the leakage will be more serious. At this time, more oil in the high-pressure oil discharge chamber leaks into the feedback chamb...

AI Technical Summary

Problems solved by technology

However, in actual situations, due to the gap between the slider and the pump chamber, it is inevitable that the oil in the feedback chamber will leak into the low-pressure oil suction chamber, and the oil in the high-pressure oil discharge chamber will leak into the feedback chamber. Under high temperature conditions, as the viscosity of the oil decreases, the leakage will be more serious. At this time, more oil in the high-pressure oil discharge chamber leaks into the feedback chamber, which interferes with the dominant factor that drives the slider variable. , which in turn causes the pressure regulation of the entire system to decrease as the temperature increases

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