Piston hinge-type variable-displacement vane pump

Abstract

The invention discloses a piston hinge-type variable-displacement vane pump. The vane pump comprises a pump shell, a pump cover, a pump control loop, a vane pump rotor, a vane loop and a plurality of vanes, wherein the outer surface of the pump control loop is provided with a first hinge bulge, the first hinge bulge is positioned on a hinge positioning hole of the inner surface of the pump shell, and the pump control loop swings by taking the hinge positioning hole as a base point, so that the volume capacity of the vane pump is changed, the outer surface of the pump control loop and one side of the first hinge bulge are provided with a second hinge bulge, and a piston is hinged with the second hinge bulge; a first control cavity is formed between the piston and the partial inner surface of the pump shell, the first control cavity is capable of introducing a pressurized fluid to generate pressure to move the pump control, so as to decrease the volume capacity of the vane pump, the outer surface of the pump control loop and the other side of the first hinge bulge prop against a reset spring, the reset spring resists the force of the first control cavity, so as to establish balance. The piston hinge-type variable-displacement vane pump is high in reliability, easy for realization of three-stage variable capability, long in force arm length, and small in inner frictional resistance.

Description

technical field [0001] The invention relates to the field of variable-displacement vane pumps, in particular to a piston hinged 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 rotates, each seali...

AI Technical Summary

Problems solved by technology

[0011] (1) Large fluctuations in oil pressure;

[0012] (2) Large internal leakage;

[0013] (3) Non-metallic seals are used inside, which has low reliability;

[0016] (6) Inflexible space arrangement; and

[0017] (7) Large internal frictional resistance

[0018] However, the conventional vane-type variable pump casing can only achieve one-stage variable, the fuel-saving effect is not obvious, and it also has most of the defects of the above-mentioned improvements.

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