CN112013263A

CN112013263A - Variable displacement oil pump capable of improving volumetric efficiency

Info

Publication number: CN112013263A
Application number: CN202010909877.8A
Authority: CN
Inventors: 李文; 许仲秋; 刘光明; 佘笑梅
Original assignee: Hunan Oil Pump Co Ltd
Current assignee: Hunan Oil Pump Co Ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2020-12-01
Anticipated expiration: 2040-09-02
Also published as: CN112013263B

Abstract

The utility model provides a variable displacement oil pump that can improve volumetric efficiency, relates to oil pump technical field, and it includes the pump body, pump cover, slider and spring, and slider fixedly connected with spring briquetting, the both ends of spring support respectively and lean on the right side wall of pump body internal face and spring briquetting, are connected with the round pin axle between slider and the pump body inner wall, are located to be equipped with left oil pocket between the left slider outer wall of round pin axle and the pump body inner wall, the left side of left oil pocket is sealed, is located to be equipped with right oil pocket between the slider outer wall on round pin axle right side and the pump body inner wall, the right side of right oil pocket is sealed, set up on the terminal surface of slider and be used for the oil drainage groove that all communicates left oil pocket and right oil pocket with the high pressure region in rotor chamber, be equipped with the. The invention can avoid high pressure oil from leaking to the feedback cavity through the gap to the maximum extent.

Description

Variable displacement oil pump capable of improving volumetric efficiency

Technical Field

The invention relates to the technical field of oil pumps, in particular to a variable displacement oil pump capable of improving volumetric efficiency.

Background

Variable displacement oil pumps have been widely used in engine lubrication systems as one type of oil pump. In a traditional variable displacement oil pump, a closed feedback cavity is formed between a sliding block and the inner wall surface of a pump body, the feedback cavity is communicated with an external pilot valve, and when oil enters the feedback cavity to form pressure, the sliding block can be pushed to swing around a pin shaft, so that the displacement is changed.

When the clearance exists, high-pressure oil in the pump cavity is easy to leak into the feedback cavity through the clearance and then is discharged to the outside through an oil way communicated with the feedback cavity, so that part of flow of the oil pump is lost, and the volumetric efficiency of the oil pump at the maximum displacement is reduced.

Disclosure of Invention

The invention aims to provide a variable displacement oil pump capable of improving the volumetric efficiency, which can prevent high-pressure oil from leaking to a feedback cavity through a gap to the greatest extent.

In order to solve the technical problems, the invention adopts the following technical scheme: a variable displacement oil pump capable of improving volumetric efficiency comprises a pump body, a pump cover, an oil inlet and an oil outlet arranged on the pump body, a slide block and a spring arranged in the pump body, wherein the slide block is fixedly connected with a spring pressing block, two ends of the spring are respectively abutted against the inner wall surface of the pump body and the right side wall surface of the spring pressing block, a rotor cavity is formed in the slide block, a rotor is arranged in the rotor cavity, a pin shaft is connected between the slide block and the inner wall of the pump body, a left oil cavity is arranged between the outer wall of the slide block positioned at the left side of the pin shaft and the inner wall of the pump body, the left side of the left oil cavity is sealed, a right oil cavity is arranged between the outer wall of the slide block positioned at the right side of the pin shaft and the inner wall of the pump body, the right side of the right oil cavity is sealed, the feedback cavity and the left oil cavity are mutually independent.

Preferably, be equipped with left arch on the left side wall of slider, be equipped with on the bellied outer wall in a left side and be used for leaning on the pump body inner wall and form sealed left sealing strip, the both ends of left oil pocket extend to round pin axle and left sealing strip department respectively.

More preferably, be equipped with right bulge on the right side wall of slider, be equipped with on the bellied outer wall of right side and be used for leaning on the pump body inner wall and form sealed right sealing strip, the both ends of right oil pocket extend to round pin axle and right sealing strip department respectively.

More preferably, the inner wall surface of the pump body is provided with a left groove and a right groove for accommodating the left protrusion and the right protrusion, respectively.

More preferably, the oil drainage groove is located on the end face of the slider at the connecting pin shaft, and two ends of the oil drainage groove respectively extend to the middle of the left oil cavity and the middle of the right oil cavity along the end face of the slider.

The working principle of the invention is as follows: when the feedback cavity enters oil to form thrust, the slide block swings anticlockwise by taking the pin shaft as a rotation center, high-pressure oil discharged from the rotor cavity into the left oil cavity and the right oil cavity cannot be discharged to the outside due to the sealing structures of the left oil cavity and the right oil cavity, and the left oil cavity and the right oil cavity are just communicated with a high-pressure area (the area corresponds to the position with the maximum oil drainage quantity of the end face of the slide block) in the rotor cavity, so that the high-pressure oil can be prevented from being discharged to the outside due to leakage to the occurrence of the high-pressure oil, the volume efficiency of the oil pump at the maximum discharge capacity is improved, and the total efficiency of the oil pump is improved; in addition, due to the mutual communication effect, the oil pressure in the left oil cavity, the right oil cavity and the rotor cavity on the inner side of the sliding block can be mutually offset, namely, the acting force influencing the movement of the sliding block around the pin shaft cannot exist in the left oil cavity and the right oil cavity, and the problem of unbalanced stress of the sliding block caused by only designing a single-side oil cavity is avoided.

Drawings

FIG. 1 is a schematic view of the interior of the overall structure in an embodiment of the present invention;

FIG. 2 is a schematic structural view of a pump body in the embodiment;

FIG. 3 is a schematic structural diagram of a slider in the embodiment.

The reference signs are:

1-pump body 2-slide block 3-spring

4-spring pressing block 5-pin shaft 6 a-left oil cavity

6 b-right oil cavity 7-oil drainage groove 8-feedback cavity

9 a-left bulge 9 b-right bulge 10 a-left sealing strip

10 b-right sealing strip 11 a-left groove 11 b-right groove.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

It should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used broadly in the present invention, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Further, in the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not in direct contact, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention.

As shown in figures 1-3, a variable displacement oil pump capable of improving volumetric efficiency comprises a pump body 1, a pump cover, an oil inlet and an oil outlet arranged on the pump body 1, a slide block 2 and a spring 3 arranged in the pump body 1, wherein the slide block 2 is fixedly connected with a spring pressing block 4, two ends of the spring 3 are respectively abutted against the inner wall surface of the pump body 1 and the right side wall surface of the spring pressing block 4, a rotor cavity is formed in the slide block 2, a rotor is arranged in the rotor cavity, a pin shaft 5 is connected between the slide block 2 and the inner wall of the pump body 1, a left oil cavity 6a is arranged between the outer wall of the slide block 2 positioned at the left side of the pin shaft 5 and the inner wall of the pump body 1, the left side of the left oil cavity 6a is sealed, a right oil cavity 6b is arranged between the outer wall of the slide block 2 positioned at the right side of the pin shaft 5 and the inner wall of the, a feedback cavity 8 is arranged between the left side wall surface of the spring pressing block 4 and the inner wall of the pump body 1, and the feedback cavity 8 and the left oil cavity 6a are mutually independent.

In the variable displacement oil pump capable of improving the volumetric efficiency provided by the above embodiment, in a normal state, when the feedback chamber 8 does not enter oil, under the action of the elastic force of the spring 3, the spring pressing block 4 is pressed to the left against the inner wall surface of the slide block 2, oil in the rotor cavity can enter a left oil cavity 6a and a right oil cavity 6b, and a person skilled in the art should know that actually, the feedback cavity 8 is usually communicated with an external regulating valve, the cavity area on the right side of the sliding block 2 is generally communicated with an oil inlet, so that oil leaked from the high-pressure area of the rotor cavity can enter the feedback cavity 8 and the cavity area on the right side of the sliding block 2 to be discharged along corresponding oil paths, so that the volume efficiency is reduced, but the left side of the left oil cavity 6a and the right side of the right oil cavity 6b are sealed, so that the oil in the high-pressure area of the rotor chamber cannot be drained away after entering the left and

right oil chambers

6a and 6b as before.

Specifically, when the feedback chamber 8 enters oil to form thrust, the slider 2 swings counterclockwise by taking the pin 5 as a rotation center, high-pressure oil discharged from the rotor cavity into the left oil chamber 6a and the right oil chamber 6b cannot be discharged to the outside due to the sealing structures of the left oil chamber 6a and the right oil chamber 6b, and the left oil chamber 6a and the right oil chamber 6b are just high-pressure areas communicated with the rotor cavity (the areas correspond to the positions with the maximum end surface quantity of the slider 2), so that the high-pressure oil can be greatly prevented from being discharged to the outside due to leakage, the volume efficiency of the oil pump at the maximum discharge capacity is improved, the total oil discharge efficiency of the oil pump is also improved, and the technical personnel in the field know that on the traditional design concept, the design discharge capacity of the variable-displacement oil pump is limited by the volume efficiency at the maximum discharge capacity, the structure that provides through this embodiment realizes the purpose that improves the volumetric efficiency when the maximum discharge capacity, just can be under the prerequisite of guaranteeing that the oil pump has certain volume fraction, designs its discharge capacity littleer relatively to reach better energy-conserving effect.

It should be noted that, as will be appreciated by those skilled in the art, due to the mutual communication, the oil pressures in the left oil chamber 6a, the right oil chamber 6b and the rotor chamber inside the slider 2 can be cancelled out, that is, no acting force affecting the movement of the slider 2 around the pin 5 exists in the left oil chamber 6a and the right oil chamber 6b, so as to avoid the problem of unbalanced stress on the slider 2 caused by designing only one-sided oil chamber.

Preferably, the sealing structure may specifically be that a left protrusion 9a is arranged on a left side wall of the slider 2, a left sealing strip 10a for abutting against an inner wall of the pump body 1 and forming a seal is arranged on an outer wall of the left protrusion 9a, and two ends of the left oil chamber 6a extend to the pin 5 and the left sealing strip 10a respectively; the right side wall of the sliding block 2 is provided with a right bulge 9b, the outer wall of the right bulge 9b is provided with a right sealing strip 10b which is used for abutting against the inner wall of the pump body 1 and forming sealing, and two ends of the right oil cavity 6b extend to the pin shaft 5 and the right sealing strip 10b respectively.

On the basis, the inner wall surface of the pump body 1 is provided with a left groove 11a and a right groove 11b for accommodating the left protrusion 9a and the right protrusion 9b, respectively.

In addition, in the present embodiment, the oil drain groove 7 is located on the end surface of the slider 2 at the connecting pin 5, and both ends of the oil drain groove 7 extend to the middle of the left oil chamber 6a and the middle of the right oil chamber 6b along the end surface of the slider 2, respectively, which enables the high-pressure oil in the rotor chamber to enter the left oil chamber 6a and the right oil chamber 6b more easily and smoothly.

The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.

Claims

1. The utility model provides a can improve variable displacement oil pump of volumetric efficiency, includes the pump body (1), pump cover, sets up oil inlet and oil-out on the pump body (1), sets up slider (2) and spring (3) in the pump body (1), slider (2) fixedly connected with spring pressing block (4), the right side wall that leans on pump body (1) internal face and spring pressing block (4) respectively is supported at the both ends of spring (3), slider (2) inside formation rotor cavity and the rotor intracavity are equipped with the rotor, be connected with round pin axle (5), its characterized in that between slider (2) and the pump body (1) inner wall: be located be equipped with left oil pocket (6 a) between the left slider (2) outer wall of round pin axle (5) and the pump body (1) inner wall, the left side seal of left oil pocket (6 a) is located be equipped with right oil pocket (6 b) between slider (2) outer wall on round pin axle (5) right side and the pump body (1) inner wall, the right side seal of right oil pocket (6 b), set up on the terminal surface of slider (2) and be used for all with the oil drainage groove (7) of the high pressure region intercommunication in rotor chamber with left oil pocket (6 a) and right oil pocket (6 b), be equipped with feedback chamber (8) between the left side wall of spring briquetting (4) and the pump body (1) inner wall, feedback chamber (8) and left oil pocket (6 a) are independent each other.

2. A variable displacement oil pump capable of improving volumetric efficiency according to claim 1, characterized in that: be equipped with left arch (9 a) on the left side wall of slider (2), be equipped with on the outer wall of left side arch (9 a) and be used for leaning on the pump body (1) inner wall and form sealed left sealing strip (10 a), the both ends of left side oil pocket (6 a) extend to round pin axle (5) and left sealing strip (10 a) department respectively.

3. A variable displacement oil pump capable of improving volumetric efficiency according to claim 2, characterized in that: be equipped with right arch (9 b) on the right side wall of slider (2), be equipped with on the outer wall of right arch (9 b) and be used for leaning on the pump body (1) inner wall and form sealed right sealing strip (10 b), the both ends of right oil pocket (6 b) extend to round pin axle (5) and right sealing strip (10 b) department respectively.

4. A variable displacement oil pump capable of improving volumetric efficiency according to claim 3, characterized in that: and a left groove (11 a) and a right groove (11 b) which are used for accommodating the left bulge (9 a) and the right bulge (9 b) respectively are formed in the inner wall surface of the pump body (1).

5. A variable displacement oil pump capable of improving volumetric efficiency according to any one of claims 1 to 4, characterized in that: the oil drainage groove (7) is located on the end face of the sliding block (2) at the connecting pin shaft (5), and two ends of the oil drainage groove (7) respectively extend to the middle of the left oil cavity (6 a) and the middle of the right oil cavity (6 b) along the end face of the sliding block (2).