CN216894889U

CN216894889U - Variable displacement vane pump

Info

Publication number: CN216894889U
Application number: CN202220292339.3U
Authority: CN
Inventors: 柯建豪; 李战训; 万丕金; 陆冲聪
Original assignee: Zhejiang Keboda Industrial Co ltd
Current assignee: Zhejiang Keboda Industrial Co ltd
Priority date: 2022-02-14
Filing date: 2022-02-14
Publication date: 2022-07-05
Anticipated expiration: 2032-02-14

Abstract

A variable displacement vane pump includes a pump casing and an eccentric ring. The pump housing has a pump chamber, an inlet port and an outlet port, and the eccentric ring is pivotally connected to the pump housing by a rotating pin and movably disposed in the pump chamber. The cavity between the inner surface of the pump chamber and the outer surface of the eccentric ring comprises an inlet cavity, a variable feedback cavity and an outlet cavity which are sealed with each other, wherein the inlet cavity is communicated with the inlet, and the outlet cavity is communicated with the outlet. The outlet chamber includes first and second extensions on both sides of the rotation pin, respectively, the first and second extensions being configured such that a first torque applied to the eccentric ring by the fluid flowing into the first extension is greater than a second torque applied to the eccentric ring by the fluid flowing into the second extension, the first torque having a direction that drives the eccentric ring to move in a direction that decreases the pump displacement. The utility model realizes the safety pressure relief function of the vane pump with smaller space and lower cost, and does not influence the variable control precision and the volumetric efficiency of the vane pump.

Description

Variable displacement vane pump

Technical Field

The present invention relates to a variable displacement vane pump.

Background

The variable displacement vane pump mainly comprises a pump shell, an eccentric ring, a rotating pin, a return spring, a rotor, a plurality of vanes, a safety valve and the like. The pump housing has a pump chamber, an inlet and an outlet. The eccentric ring is pivotally connected to the pump housing by a rotation pin, and the eccentric ring is movably disposed in the pump chamber to vary a displacement of the pump. A variable feedback chamber is provided between an inner surface of the pump chamber and an outer surface of the eccentric ring, and receives oil of a main oil gallery of the variable displacement vane pump to generate a force to move the eccentric ring to change a displacement of the pump. A return spring is disposed between the pump housing and the eccentric ring to apply a biasing force to the eccentric ring. A rotor is disposed within the central bore of the eccentric ring, the rotor having an axis of rotation offset from the central axis of the eccentric ring. One end of each vane is slidably disposed in the rotor slot, and the other end abuts the inner surface of the eccentric ring. Each adjacent two of the vanes, the rotor, and the inner surface of the eccentric ring collectively define a working chamber. When the rotor rotates from the oil suction side (low pressure side) to the oil discharge side (high pressure side), the plurality of blades also rotate along with the rotor, the volume of the working chamber can change, oil is sucked from small to large and then is pressed from large to small, and the rotor rotates for a circle to finish oil suction and oil discharge once.

The safety valve of the traditional variable displacement vane pump mainly adopts a steel ball or plunger type structure, occupies larger space and has higher manufacturing cost. The pressure relief mode of the safety valve is internal leakage or external leakage, and certain waste can be caused to the power of the vane pump during working. In addition, the eccentric ring of traditional variable displacement vane pump adopts half slot structure and rotatory round pin to cooperate, can not retrain the eccentric ring on the pump case completely in radial direction, and when the weight of eccentric ring part was great, the eccentric ring can take place the friction with the elastic sealing element who sets up between pump chamber internal surface and eccentric ring surface under the effect of gravity and oil pressure to lead to the oil pump to produce abnormal wear in low oil pressure during operation sealing position.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a variable displacement vane pump, which realizes the safety pressure relief function of the vane pump with smaller space and lower cost, and does not influence the variable control precision and the volumetric efficiency of the vane pump.

Another object of the present invention is to provide a variable displacement vane pump, which can prevent abnormal friction between an eccentric ring and an elastic sealing member and prevent abnormal abrasion of the elastic sealing member.

The embodiment of the utility model provides a variable displacement vane pump, which comprises a pump shell and an eccentric ring, wherein the pump shell is provided with a pump chamber, an inlet and an outlet; a cavity is formed between the inner surface of the pump chamber and the outer surface of the eccentric ring; the cavity comprises an inlet cavity, a variable feedback cavity and an outlet cavity which are sealed with each other, the inlet cavity is communicated with the inlet, and the outlet cavity is communicated with the outlet; the outlet chamber includes first and second extensions on opposite sides of the rotation pin, the first and second extensions abutting against the eccentric ring, respectively, the first and second extensions being configured such that a first torque exerted on the eccentric ring by fluid flowing into the first extension is greater than a second torque exerted on the eccentric ring by fluid flowing into the second extension, the first torque being in a direction opposite to the second torque, the first torque being in a direction that drives the eccentric ring in a direction that reduces the pump displacement.

The variable displacement vane pump comprises three sets of elastic sealing elements, wherein the three sets of elastic sealing elements are arranged between the inner surface of the pump chamber and the outer surface of the eccentric ring, and divide a cavity between the inner surface of the pump chamber and the outer surface of the eccentric ring into an inlet cavity, a variable feedback cavity and an outlet cavity which are sealed with each other.

In the variable displacement vane pump, the rotating pin is fixed to the pump casing; the eccentric ring is provided with a pin hole, and the rotating pin passes through the pin hole and is in clearance fit with the pin hole.

After the technical scheme is adopted, the utility model at least has the following advantages and characteristics:

1. the embodiment is provided with the inlet cavity, the variable feedback cavity and the outlet cavity which are sealed with each other, so that the outlet oil pressure, the inlet oil pressure and the variable feedback oil pressure of the vane pump are separated independently, when the oil pressure flowing into the outlet is greater than a preset threshold value, a first torque applied to the eccentric ring by the fluid flowing into the first extension part can overcome a second torque applied to the eccentric ring by the fluid flowing into the second extension part, the eccentric ring is pushed to move towards the direction of reducing the displacement of the pump, the outlet oil pressure of the pump is further reduced, and the effect of safe pressure relief is achieved;

2. the eccentric ring is assembled on the rotating pin in a full-circle clearance fit mode, the eccentric ring can be completely positioned in the radial direction, and abnormal friction between the eccentric ring and an elastic sealing element arranged between the inner surface of the pump chamber and the outer surface of the eccentric ring due to vibration of the eccentric ring under the action of gravity and oil pressure is prevented, so that abnormal abrasion of the elastic sealing element is caused.

Drawings

Fig. 1 shows an internal structural diagram of a variable displacement vane pump according to an embodiment of the present invention.

Fig. 2 shows a schematic cross-sectional view of a rotation pin and a pin hole thereof of a variable displacement vane pump according to an embodiment of the present invention.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments.

Please refer to fig. 1. A variable displacement vane pump according to an embodiment of the present invention includes a pump housing 1, an eccentric ring 2, a rotation pin 3, a return spring 4, a rotor 5, and a plurality of vanes 6.

The pump housing 1 includes a pump chamber 10, an inlet 11, and an outlet 12. Three sets of elastic sealing members 7 are provided between the inner surface of the pump chamber 10 and the outer surface of the eccentric ring 2, the three sets of elastic sealing members 7 divide a cavity between the inner surface of the pump chamber and the outer surface of the eccentric ring into an inlet chamber 101, an outlet chamber 102 and a variable feedback chamber 103 which are sealed with each other, the inlet chamber 101 communicates with the inlet 11, the outlet chamber 102 communicates with the outlet 12, and the variable feedback chamber 103 communicates with a main oil gallery of an engine lubrication system. Optionally, the elastic seal 7 is a rubber seal. The sealing structure adopting the elastic sealing element can lead the eccentric ring 2 to swing normally.

The eccentric ring 2 is pivotally connected to the pump housing 1 by a rotation pin 3, which is movably disposed in the pump chamber 10 to vary the displacement of the pump. In the present embodiment, the rotation pin 3 is fixed to the pump housing 1. The eccentric ring 2 is provided with a pin hole 20, and the rotating pin 3 passes through the pin hole 20 and is in clearance fit with the pin hole 20. In the present embodiment, the rotation pin 3 is a cylindrical pin, and the pin hole 20 is a circular hole. The rotating pin 3 can control the freedom degree of the eccentric ring 2 in the X-axis direction (horizontal direction in fig. 1) and the Y-axis direction (vertical direction in fig. 1), and prevent the eccentric ring from vibrating under the action of gravity and oil pressure to generate abnormal friction with an elastic sealing element arranged between the inner surface of the pump chamber and the outer surface of the eccentric ring, so as to cause abnormal abrasion of the elastic sealing element.

Please refer to fig. 2. In this embodiment, the end surface of the eccentric ring 2 is provided with a first groove 23 penetrating through the outlet cavity 102 and the hole wall of the pin hole 20, the hole wall of the pin hole 20 is provided with a second groove 204 penetrating along the axial direction, and the second groove 204 is communicated with the first groove 23. In this way, the oil in the outlet chamber 102 can flow into the second groove 204, and the outer peripheral surface of the rotary pin 3 and the hole wall of the pin hole 20 are lubricated, thereby reducing wear.

The variable feedback chamber 103 may receive oil from the main oil gallery of the engine lubrication system, thereby generating a force to move the eccentric ring 2 to change the displacement of the pump. A return spring 4 is provided between the pump housing 1 and the eccentric ring 2 to apply a biasing force to the eccentric ring 2. The rotor 5 is arranged in the central hole 21 of the eccentric ring 2, the rotor 5 having an axis of rotation offset from the central axis of the eccentric ring 2. One end of each vane 6 is slidably disposed in the rotor slot, and the other end abuts the inner surface of the eccentric ring 2. In the present embodiment, the outlet chamber 102 includes a first extension 105 and a second extension 106 respectively located at both sides of the rotation pin 3, the first extension 105 and the second extension 106 respectively abut against the eccentric ring 2, the first extension 105 and the second extension 106 are configured such that a first torque applied to the eccentric ring 2 by a fluid (oil in the present embodiment) flowing into the first extension 105 is greater than a second torque applied to the eccentric ring 2 by a fluid flowing into the second extension 106, the first torque is opposite to the second torque, and the first torque is a direction to drive the eccentric ring 2 to move in a direction to reduce the pump displacement. When a variable displacement vane pump serving as an oil pump is started, when the oil pressure flowing into the outlet 12 is greater than a preset threshold value, the first torque overcomes the resistance of the second torque, and pushes the eccentric ring 2 to move towards the direction of reducing the pump displacement (the eccentric ring 2 in fig. 1 overcomes the elastic force of the return spring 4 and rotates anticlockwise around the rotating pin 3), so that the outlet oil pressure of the vane pump is reduced, and the effect of safe pressure relief is achieved.

In a specific embodiment, in order to make the first torque applied to the eccentric ring 2 by the fluid flowing into the first extension 105 larger than the second torque applied to the eccentric ring 2 by the fluid flowing into the second extension 106, the length of the first extension 105 extending in the circumferential direction of the eccentric ring 2 is set larger than the length of the second extension 106 extending in the circumferential direction of the eccentric ring 2.

In the present embodiment, the end surface of the eccentric ring 2 is provided with a fluid outlet groove 25 penetrating the outlet chamber 102 and the hole wall of the center hole 21 of the eccentric ring 2 at a position close to the outlet chamber 102, and the pressurized fluid flows to the outlet 12 through the fluid outlet groove 25. The structure improves the oil outlet efficiency of the vane pump and solves the problems of small axial installation space and difficult layout.

In this embodiment, one fluid output groove 25 is provided on each side of the rotation pin 3, and the two fluid output grooves 25 face the first extension portion 105 and the second extension portion 106, respectively, but in another embodiment, the fluid output groove 25 may be provided only on one side of the rotation pin 3.

The embodiment enables the outlet oil pressure, the inlet oil pressure and the variable feedback oil pressure of the vane pump to be separated independently, and the integrated function of the safety valve is achieved while the variable control precision and the volume efficiency of the oil pump are not influenced.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A variable displacement vane pump comprises a pump shell and an eccentric ring, wherein the pump shell is provided with a pump chamber, an inlet and an outlet, the eccentric ring is pivoted with the pump shell through a rotating pin and is movably arranged in the pump chamber so as to change the displacement of the pump; a cavity is formed between the inner surface of the pump chamber and the outer surface of the eccentric ring; the variable feedback type air conditioner is characterized in that the cavity comprises an inlet cavity, a variable feedback cavity and an outlet cavity which are sealed with each other, the inlet cavity is communicated with the inlet, and the outlet cavity is communicated with the outlet;

the outlet chamber includes a first extension and a second extension respectively located on both sides of the rotation pin, the first extension and the second extension respectively abutting against the eccentric ring, the first extension and the second extension being configured such that a first torque exerted on the eccentric ring by a fluid flowing into the first extension is greater than a second torque exerted on the eccentric ring by a fluid flowing into the second extension, the first torque being in a direction opposite to the second torque, the first torque being in a direction that drives the eccentric ring in a direction that decreases the pump displacement.

2. A variable displacement vane pump as claimed in claim 1, comprising three sets of resilient seal members disposed between the inner surface of the pump chamber and the outer surface of the eccentric ring, dividing a cavity between the pump chamber inner surface and the outer surface of the eccentric ring into the inlet chamber, the variable feedback chamber and the outlet chamber, which are sealed from one another.

3. A variable displacement vane pump as claimed in claim 2, wherein the resilient seal is a rubber seal.

4. A variable displacement vane pump as claimed in any one of claims 1 to 3, wherein the rotation pin is fixed to the pump casing;

the eccentric ring is provided with a pin hole, and the rotating pin penetrates through the pin hole and is in clearance fit with the pin hole.

5. A variable displacement vane pump as claimed in claim 4, wherein the rotation pin is a cylindrical pin and the pin hole is a circular hole.

6. A variable displacement vane pump as claimed in claim 4, wherein the end face of the eccentric ring is provided with a first groove passing through the outlet chamber and the pin bore wall, and the pin bore wall is provided with a second groove passing axially therethrough, the second groove communicating with the first groove.

7. A variable displacement vane pump as claimed in claim 1, wherein the end face of the eccentric ring is provided with a fluid outlet groove through the outlet chamber and the central bore wall of the eccentric ring at a location adjacent the outlet chamber.