Piston control type variable displacement vane pump

Abstract

The invention discloses a piston control type variable displacement vane pump which comprises a pump shell, a pump control ring, a vane pump rotor, a vane ring, a plurality of vanes, an oil cylinder, a pump cover and a control piston, wherein the intermediate part of the oil cylinder is communicated with a pump chamber; the control piston is positioned at the intermediate part of the oil cylinder; the outer surface of the pump control ring is respectively provided with a first bulge and a second bulge, the first bulge is positioned in a first slide block positioning hole in the intermediate part of the control piston, and the second bulge is positioned in a second slide block positioning hole in the inner surface of the pump shell; the pump control ring is linked with the control piston and swing by taking the second slide block positioning hole as a basic point to change the volume capacity of the vane pump; a first cavity and a first control cavity are formed between both ends of the control piston and the inner wall of the oil cylinder respectively, the first cavity is internally provided with a reset spring, the first control cavity is sealed with the pump chamber, a pressurized fluid is introduced into the first control cavity to generate force to move the pump control ring so as to reduce the volume capacity of the vane pump, and the reset spring resists the force inside the first control cavity to establish equilibrium.

Description

technical field [0001] The invention relates to the field of variable-displacement vane pumps, and more specifically, to a piston-controlled variable-displacement vane pump. Background technique [0002] The inner surface of the stator of the variable vane pump is a circle, and there is an eccentric distance between the rotor and the stator. There is only one oil suction window and one oil pressure window on the oil distribution plate. When the rotor is driven by the motor and rotates in the direction of the arrow in the figure, when the blade passes through the lower half of the stator, under the action of centrifugal force, it protrudes from the blade groove, and the sealing volume between the two blades increases to realize oil absorption; the blade passes through the stator In the upper half, it is gradually pressed into the vane groove by the inner surface of the stator, and the sealing volume is reduced to realize oil pressure. Every time the rotor of the pump rotate...

AI Technical Summary

Problems solved by technology

[0010] 1. Since the periphery of the control ring needs to be fed with high-pressure oil to control the control ring, the processing requirements of the shell are high, and the outside of the shell needs a large sealing surface, which increases the processing cost and requires a large space, resulting in volume and heavy

[0011]2. Due to structural limitations, the pre-tightening force of the spring is relatively large, resulting in a large space requirement for the spring, and the overall responsiveness of the pump becomes poor

[0012]3. Since the interior needs to be sealed, non-metallic parts need to be used for sealing, the reliability becomes poor, and the cost is high

[0013]4. It is impossible to make the displacement of the pump increase in the oil pressure state, but it can only work in the direction of reducing the displacement

[0014]5. All designs of the current structure need to pass high pressure to the outside of the control ring, resulting in complex shape and deformation of the control ring, which affects its performance

[0015]6. It is difficult to adjust the length of high and low pressure moments

[0016]7. Greatly affected by cavitation

[0017] 8. The control loop cannot achieve precise control

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