CN214119643U

CN214119643U - Gear type oil pump with compact structure

Info

Publication number: CN214119643U
Application number: CN202022996322.XU
Authority: CN
Inventors: 邓鹏辉; 许仲秋; 刘光明; 佘笑梅
Original assignee: Hunan Oil Pump Co Ltd
Current assignee: Hunan Meihu Intelligent Manufacturing Co.,Ltd.
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-09-03
Anticipated expiration: 2030-12-15

Abstract

A gear type oil pump with a compact structure relates to the technical field of automobile oil pumps, and a pump body and a pump cover are respectively provided with a driving shaft hole and a driven shaft hole; radial pin holes are formed in the driving shaft and the driving pump gear, the elastic pin is pressed in the pin holes of the driving shaft and the driving pump gear, the driving shaft is fixed with the driving pump gear through the elastic pin, and the driving shaft is assembled in a shaft hole of the driving shaft in a clearance mode; the driven shaft is in clearance fit with the driven pump gear, and the driven shaft is assembled in the driven shaft hole in an interference manner; in the running process of the gear type oil pump, the driving shaft drives the driving pump gear to rotate through the elastic pin, and the driving pump gear drives the driven pump gear to rotate around the driven shaft through being meshed with the driven pump gear. The driving shaft and the driving pump gear of the utility model are connected by the elastic pin, thus eliminating the deformation and residual stress caused by the interference between the shaft and the gear and reducing the risk of failure of the pump gear; the driven pump gear is in clearance fit with the driven shaft, and initial deformation and residual stress do not exist.

Description

Gear type oil pump with compact structure

Technical Field

The utility model relates to an automobile oil pump technical field, in particular to compact structure type gear type oil pump.

Background

The design of automobile engines focuses on reducing the volume and weight of the engine, and the oil pump is one of the main parts of the engine, so that the engine oil pump has a main application significance in reducing the weight of the oil pump and reducing the arrangement size of the oil pump and designing a compact engine.

The gear pump is one of main structural forms of the oil pump, the oil pump with different material types of the pump gear and the transmission shaft is adopted, the gear and the shaft are assembled by adopting an interference connection process, the interference connection is performed by a press machine due to certain interference magnitude between the shaft and a gear shaft hole, the interference assembly is often performed by the press machine, after the interference assembly of the gear and the shaft, the appearance contour is often deformed to a certain extent, residual stress can be generated in the press-mounting process, and the gear pump is particularly obvious for the gear with larger interference magnitude and smaller gear outer diameter. And in severe cases can even lead to failure of the gears and affect the flow performance of the pump.

SUMMERY OF THE UTILITY MODEL

To the defect that above-mentioned prior art exists, the utility model aims to solve the problem that a compact structure type gear type oil pump of simple structure, excellent performance is proposed.

In order to solve the above problem, the utility model provides a following technical scheme: a gear type oil pump with a compact structure comprises a pump body, a pump cover, a driving shaft, a driven shaft, a driving pump gear, a driven pump gear and an elastic pin; the pump body and the pump cover are both provided with a driving shaft hole and a driven shaft hole; radial pin holes are formed in the driving shaft and the driving pump gear, an elastic pin is pressed in the pin holes of the driving shaft and the driving pump gear, the driving shaft and the driving pump gear are fixed through the elastic pin, one end of the driving shaft is in clearance fit with a driving shaft hole in the pump body, and the other end of the driving shaft is in clearance fit with a driving shaft hole in the pump cover; the driven shaft is in clearance fit with the driven pump gear, one end of the driven shaft is in interference fit connection with the driven pump gear on the pump body, and the other end of the driven shaft is in interference fit connection with the driven pump gear on the pump cover; the driving shaft drives the driving pump gear to rotate through the elastic pin in the operation process, and the driving pump gear drives the driven pump gear to rotate around the driven shaft through being meshed with the driven pump gear.

Furthermore, a bush is pressed in a driving shaft hole of the pump body; an oil inlet, an oil outlet and an installation bolt hole are formed in the pump cover.

Furthermore, a lubricating oil hole communicated with the shaft hole is formed in the tooth root of the driven pump gear.

Preferably, the pump body is made of cast iron materials, the pump cover is made of alloy materials, and the driving pump gear and the driven pump gear are made of powder metallurgy materials.

The utility model discloses the technological effect who gains has: the driving shaft and the driving pump gear are connected by the elastic pin instead of interference assembly connection, so that deformation and residual stress of a shaft hole and a tooth surface after interference assembly and press fitting due to interference of the shaft and the gear are eliminated, and the risk of pump gear failure is reduced; the driven pump gear is clearance fit with the driven shaft, and initial deformation and residual stress cannot exist due to interference connection.

Drawings

Fig. 1 is an exploded view of a gear type oil pump in an embodiment of the present invention;

fig. 2 is a diagram of a pump body of a gear type oil pump in the embodiment of the present invention;

fig. 3 is a cross-sectional view of the gear type oil pump along the AA line in fig. 2 according to the embodiment of the present invention;

FIG. 4 is a driving shaft diagram of a gear type oil pump in the embodiment of the present invention;

fig. 5 is a gear diagram of an active pump of the gear type oil pump according to the embodiment of the present invention;

fig. 6 is a gear diagram of a driven pump of the gear type oil pump according to the embodiment of the present invention;

FIG. 7 is a diagram of a pump cover of a gear type oil pump in an embodiment of the present invention;

in the figure:

1-pump body 2-pump cover 3-driving shaft 4-driven shaft

5-driving pump gear 6-driven pump gear 7-elastic pin

8-pump body bush 9-pin hole 10-oil inlet

11-oil outlet 12-lubricating oil hole.

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.

In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and for example, the two elements may be connected internally, directly or indirectly through an intermediate medium, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

A gear type oil pump with a compact structure is disclosed, as shown in figures 1 to 5, the gear type oil pump comprises a pump body 1, a pump cover 2, a driving shaft 3, a driven shaft 4, a driving pump gear 5, a driven pump gear 6 and an elastic pin 7; the pump body 1 and the pump cover 2 are both provided with a driving shaft hole and a driven shaft hole, and a bushing 8 is pressed in the driving shaft hole of the pump body 1; radial pin holes 9 are formed in the driving shaft 3 and the driving pump gear 5, an elastic pin 7 is pressed in the pin holes 9 of the driving shaft 3 and the driving pump gear 5, the driving shaft 3 and the driving pump gear 5 are fixed through the elastic pin 9, one end of the driving shaft 3 is in clearance fit with a driving shaft hole in the pump body 1, and one end of the driving shaft 3 is in clearance fit with a driving shaft hole in the pump cover 2; the driven shaft 4 is in clearance fit with the driven pump gear 6, one end of the driven shaft 4 is in interference fit connection with a driven shaft hole in the pump body 1, and the other end of the driven shaft 4 is in interference fit connection with a driven shaft hole in the pump cover 2; in the running process of the gear type oil pump, the driving shaft 3 drives the driving pump gear 5 to rotate through the elastic pin 7, and the driving pump gear 5 drives the driven pump gear 6 to rotate around the driven shaft 4 through being meshed with the driven pump gear 6; because the driven shaft 4 adopts interference fit with the driven shaft holes on the pump body 1 and the pump cover 2, the driven shaft holes of the pump body 1 and the pump cover 2 do not need to be provided with bushings to reduce friction.

Specifically, as shown in fig. 6, the driven pump gear 6 is provided at the tooth root with a lubricating oil hole 12 communicating with the shaft hole; when the oil pump is used for the operation of the driven shaft 4 and the driven pump gear 6, oil is introduced to guide lubricating oil in the pump to lubricate the friction motion between the driven pump gear 6 and the driven shaft 4, and the motion performance is improved.

Specifically, as shown in fig. 7, the pump cover 2 is provided with an oil inlet 10, an oil outlet 11 and an installation bolt hole.

Specifically, the pump body 1 is made of cast iron, and the pump cover 2 is made of alloy materials, so that compared with a gear type oil pump which is made of cast iron completely, the weight is reduced, and the target design weight is achieved; the driving pump gear 5 and the driven pump gear 6 are made of powder metallurgy materials, and the wear resistance is improved.

The driving shaft and the driving pump gear of the utility model adopt elastic pin connection to replace interference assembly connection, thus eliminating the deformation and residual stress of the shaft hole and the tooth surface after interference assembly and press fitting due to the interference magnitude of the shaft and the gear, and reducing the risk of pump gear failure; because the driven pump gear is in clearance fit with the driven shaft, the driven pump gear cannot have initial deformation and residual stress due to interference connection.

The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize by other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.

In order to make it easier for those skilled in the art to understand the improvement of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and in order to clarify, some other elements have been omitted from this document, those skilled in the art should recognize that these omitted elements may also constitute the content of the present invention.

Claims

1. The utility model provides a compact structure type gear type oil pump which characterized in that: the gear type oil pump comprises a pump body (1), a pump cover (2), a driving shaft (3), a driven shaft (4), a driving pump gear (5), a driven pump gear (6) and an elastic pin (7); the pump body (1) and the pump cover (2) are respectively provided with a driving shaft hole and a driven shaft hole; radial pin holes (9) are formed in the driving shaft (3) and the driving pump gear (5), the elastic pin (7) is pressed in the pin holes (9) of the driving shaft (3) and the driving pump gear (5), and the driving shaft (3) and the driving pump gear (5) are fixed through the elastic pin (7); one end of the driving shaft (3) is in clearance fit with a driving shaft hole in the pump body (1), and the other end of the driving shaft (3) is in clearance fit with the driving shaft hole in the pump cover (2); the driven shaft (4) is in clearance fit with the driven pump gear (6), one end of the driven shaft (4) is in interference fit connection with a driven shaft hole in the pump body (1), and the other end of the driven shaft (4) is in interference fit connection with a driven shaft hole in the pump cover (2); the driving shaft (3) drives the driving pump gear (5) to rotate through the elastic pin (7) in the operation process, and the driving pump gear (5) drives the driven pump gear (6) to rotate around the driven shaft (4) by being meshed with the driven pump gear (6).

2. The compact gear type oil pump according to claim 1, characterized in that: and a bush (8) is pressed in a driving shaft hole of the pump body (1).

3. The compact gear type oil pump according to claim 1, characterized in that: an oil inlet (10), an oil outlet (11) and an installation bolt hole are formed in the pump cover (2).

4. The compact gear type oil pump according to claim 1, characterized in that: and a lubricating oil hole (12) communicated with the shaft hole is formed in the tooth root of the driven pump gear (6).

5. The compact gear type oil pump according to claim 1, characterized in that: the pump body (1) is made of cast iron materials, the pump cover (2) is made of alloy materials, and the driving pump gear (5) and the driven pump gear (6) are made of powder metallurgy materials.