A variable displacement vane pump

Abstract

A disclosed displacement-variable impeller pump comprises an eccentric ring (2), a rotor (3) and an adjusting mechanism used for adjusting the eccentric distance between the eccentric ring (2) and the rotor (3), and is characterized in that the displacement-variable impeller pump also comprises a pilot valve (4) used for driving the adjusting mechanism to change the eccentric distance between the eccentric ring (2) and the rotor (3), and the pilot valve (4) is communicated with an oil pipe (5) via the adjusting mechanism. According to the structure of the displacement-variable impeller pump, because of the control of the pilot valve, oil pressure information is avoided from feeding back from the pump chamber, therefore the hysteresis and the error of displacement adjusting are avoided, and also the interference of the pressure dropping phenomenon at a high speed to a control system is avoided, and thus the high-speed safe pressure value cannot be improved manually and the best energy utilization rate is realized.

Description

technical field [0001] The invention relates to an oil pump in the field of automobile engines, in particular to a variable displacement vane pump. Background technique [0002] With the development of modern society, cars, as an important means of transportation, have increasingly entered people's lives. As the core component of an automobile, the engine's lubrication system directly affects the performance and life of the engine. The lubrication system of a traditional automobile engine is simply to drive the rotor of the oil pump through the engine shaft to rotate, thereby driving a number of blades on the rotor to rotate. The chambers of different volumes are compressed and expanded, and finally realize negative pressure oil suction and high pressure oil delivery. It can be seen that in this type of oil pump, when the eccentric distance between the center of the inner cavity and the axis of the rotating shaft is fixed, the output of high-pressure oil provided by it is ...

AI Technical Summary

Problems solved by technology

[0004] 1 The sensor detects the pressure information of the oil and feeds it back to the system, and then the system controls the adjustment mechanism to drive the control ring to swing, but in a process, because the control ring is often large, due to its own inertia, the oil There must be hysteresis in the adjustment of displacement

[0005] 2. During the swinging process, there must be a certain amount of friction between the control ring and the inner wall of the pump. Whether it is the friction force of the direct contact between the two or the friction force generated by the seal, it is always opposite to the direction of motion. Therefore, the friction The force will cause the required force to be different before and after the control ring swings, which will cause an error in the control of the adjustment mechanism, resulting in an error in the system control

As a last resort, a certain amount of high-speed energy waste is caused.

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