CN218177464U - Bearing mounting structure and vacuum pump - Google Patents

Abstract

The utility model provides a bearing mounting structure and vacuum pump, bearing mounting structure includes: the motor shaft penetrates through the bearing assembly, and the flange is fixedly connected with the bearing assembly; the bearing assembly comprises a bearing and an elastic gasket, the elastic gasket is sleeved outside the bearing, and the bearing is connected with the flange through the elastic gasket. After the technical scheme is adopted, the problem that the radial runout of the motor shaft is poor under complex conditions of high temperature, low temperature and the like can be effectively solved, and the abrasion of the pump cavity blades is reduced, so that the service life of the vacuum pump is prolonged.

Description

Bearing mounting structure and vacuum pump

Technical Field

The utility model relates to a bearing assembly technical field especially relates to a bearing mounting structure and a vacuum pump.

Background

An electronic vacuum pump is a device for providing a vacuum boosting source for an automobile brake auxiliary system, and a vane type electronic vacuum pump is most widely used. When the vane type electronic vacuum pump operates, the rotor blades in the pump cavity are thrown outwards under the action of centrifugal force to be in direct contact with the pump cavity steel ring and generate friction, so that the stability of the operation of the rotor blades plays an important role in the service life of the whole vacuum pump. The vacuum pump rotor is installed on the motor shaft through the shaft coupling, so the radial runout of the motor shaft directly influences the stability of the rotor blade operation, and then influences the service life of the vacuum pump.

Ball bearing generally installs on the motor flange, and to the vacuum pump motor, because the motor flange has integrateed into, gas outlet etc. the structure is comparatively complicated, therefore forms with the aluminum alloy casting usually. The most common ball bearing fixing mode is to install the bearing on the flange by direct interference at present to rivet the flange with axial fixity at bearing inner race tip, this kind of mode can guarantee under normal atmospheric temperature environment that the motor shaft has better run-out, but when complex environment especially high, low temperature, because aluminum alloy flange and ball bearing heat altered shape volume difference are great, the bearing can not be better fixed can appear becoming flexible even, therefore motor shaft run-out variation, directly influences the operating life of vacuum pump.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical defect, the utility model aims to provide a bearing mounting structure and a vacuum pump.

Specifically, the bearing mounting structure includes: a motor shaft, a flange and a bearing assembly,

the motor shaft penetrates through the bearing assembly, and the flange is fixedly connected with the bearing assembly;

the bearing assembly comprises a bearing and an elastic washer, the washer is sleeved on the outer side of the bearing, and the bearing is connected with the flange through the washer.

Preferably, the surface of the elastic washer is uniformly provided with a pattern protruding in the bearing direction.

Preferably, the high point of the pattern is in interference fit with the outer side of the bearing.

Preferably, the elastic washer is integrally formed and made of spring steel.

Preferably, the bearing assembly further comprises a bearing cover arranged below the bearing and connected with the lower surface of the bearing; the outer edge of the bearing cover is connected with the flange.

Preferably, the bearing cover comprises a connecting portion and an extending portion which are sequentially connected, the connecting portion is connected with the lower surface of the bearing, the connecting portion extends towards the flange direction to form a plurality of extending portions, and the extending portions abut against the flange and are used for fixing the bearing cover.

Preferably, the bearing comprises a rotating inner ring and a fixed outer ring, and the connecting part is connected with the outer ring; the extension is in interference fit with the flange.

The utility model discloses an on the other hand still includes a vacuum pump, the vacuum pump includes as above arbitrary bearing mounting structure.

After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:

the problem that the radial runout of a motor shaft becomes poor under complex conditions of high temperature, low temperature and the like can be effectively solved, and the abrasion of the vanes of the pump cavity is reduced, so that the service life of the vacuum pump is prolonged.

Drawings

FIG. 1 is a schematic view of a prior art bearing mounting arrangement;

fig. 2 is a cross-sectional view of a bearing mounting structure in accordance with an embodiment of the present invention;

FIG. 3 is an enlarged partial view of the bearing mounting structure of FIG. 2 taken along section line A;

FIG. 4 is a schematic view of an elastomeric washer of the bearing mounting structure of FIG. 2;

fig. 5 is a schematic view of a bearing mounting structure according to another embodiment of the present invention;

fig. 6 is a sectional view of the bearing mounting structure of fig. 5.

Reference numerals:

10-bearing assembly, 11-bearing, 111-bearing inner race, 112-bearing outer race, 12-spring washer, 121-pattern, 13-bearing cap

20-flange, 21-rivet;

30-motor shaft.

Detailed Description

The advantages of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and 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, are not to be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

Fig. 1 is a schematic structural diagram of a flange and a bearing in the prior art. Referring to fig. 1, the flange 20 extends a rivet 21 toward the bearing 11, and the rivet 21 abuts against the bearing 11 to form an interference fit, thereby fixing the bearing 11. However, in the prior art, the flange is usually cast from an aluminum alloy, so that the thermal expansion coefficient of the flange is greater than that of the bearing, the shape of the flange is more easily affected by the external temperature, and the thermal deformation difference between the flange and the bearing is large. If the external temperature is higher or lower, a gap is generated between the bearing and the flange, the bearing is loosened, the motor is further caused to jump in the axial direction and the radial direction, and the stability of the operation of the rotor blade is influenced.

Fig. 2 is a sectional view of a bearing mounting structure according to an embodiment of the present invention, and fig. 3 is a partial enlarged view of a sectional view a of the bearing mounting structure in fig. 2. Referring to fig. 2 and 3, the bearing mounting structure in this embodiment includes a motor shaft 30, a flange 20, and a bearing assembly 10, the motor shaft 30 passes through the bearing assembly 10, and the flange 20 is fixedly connected to the bearing assembly 10. The bearing assembly 10 further comprises a bearing 11 and an elastic washer 12, wherein the elastic washer 12 is sleeved outside the bearing 11, and the bearing 11 is connected with a flange 20 through the elastic washer 12.

In this embodiment, the elastic washer 12 is additionally arranged between the bearing 11 and the flange 20, and when the bearing 11 and the flange 20 deform, a gap between the bearing 11 and the flange 20, which is caused by different deformation degrees, can be made up by the elastic washer 12, so that close fit between the bearing assembly 10 and the flange 20 is ensured, and the stability of the operation of the rotor blade is ensured.

Further, referring to fig. 4, the surface of the elastic washer 12 is uniformly provided with a pattern 121 protruding toward the bearing 11. In this embodiment, the outer surface of the pattern 121 is formed in a dome shape, and is curved in the direction of the bearing 11. The high points of the pattern 121 are actually generatrices of the outer surface of the dome shape, and as can be seen from fig. 3, the high points of the pattern 121 are in interference fit with the outer side of the bearing 11. The patterns 121 provide deformation spaces for the elastic gasket 12, and improve the application effect of the elastic gasket 12.

In other embodiments, the pattern 121 may have other shapes as long as the connection between the bearing 11 and the flange 20 can be fastened, and the present invention is not limited thereto.

The elastic washer 12 may be made of spring steel or the like, and is first punched into a band shape and then rolled and shaped.

In another embodiment consistent with the present invention, as shown in fig. 5 and 6, a bearing cover 13 is further disposed below the bearing 11 and connected to the lower surface of the bearing 11; the outer edge of the bearing cap 13 meets the flange 20 to enhance the fixation of the bearing in the axial direction.

Referring to fig. 6, the bearing cap 13 includes a connecting portion and an extending portion that are sequentially connected, the connecting portion is connected to a lower surface of the bearing, the connecting portion extends toward the flange 20 to form a plurality of extending portions, and the extending portions abut against the flange 20 to fix the bearing cap 13.

In this embodiment, the outer edge of the bearing cap 13 includes a plurality of toothed extensions, and the extensions abut against the flange 20 to achieve the interference fit between the bearing cap 13 and the flange 20.

It is understood that, in other embodiments, the outer edge of the bearing cap 13 may have other shapes as long as the interference fit between the bearing cap 13 and the flange 20 can be achieved, and the present invention is not limited in particular.

As is known in the art, a bearing comprises an inner ring 111 and an outer ring 112, the inner ring 111 being coaxial to the shaft and rotating coaxially with the motor shaft 30, the outer ring 112 being fixed, the inner ring 111 and the outer ring 112 being generally connected by rolling elements (e.g. balls). Referring to fig. 5, in the present embodiment, the bearing 11 is a ball bearing 11, the inner ring 111 of the bearing is a rotating part, the outer ring 112 is a fixed part, and the bearing cover 13 is connected to the outer ring 112 of the ball bearing 11 for stability, and the extension of the bearing cover 13 is in interference fit with the flange 20 to fix the ball bearing 11 in the axial direction.

It is above-mentioned to synthesize, the utility model discloses in through setting up elastic washer 12 and bearing cap 13, strengthened bearing and motor shaft at axial and ascending fixed radially, can effectively solve the problem of motor shaft runout variation under complex conditions such as high, low temperature, reduce pump chamber blade wearing and tearing to the life-span of vacuum pump has been prolonged.

In another embodiment of the present invention, a vacuum pump is included. The vacuum pump comprises the bearing mounting structure in the embodiment, the technical characteristics of the vacuum pump are the same as those of the bearing mounting structure, and the details are not repeated herein.

It should be noted that the embodiments of the present invention have better practicability and are not intended to limit the present invention in any way, and any person skilled in the art may change or modify the technical contents disclosed above to equivalent effective embodiments, but all the modifications or equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims (8)

1. A bearing mounting structure, characterized by comprising: a motor shaft, a flange and a bearing component,

the motor shaft penetrates through the bearing assembly, and the flange is fixedly connected with the bearing assembly;

the bearing assembly comprises a bearing and an elastic gasket, the elastic gasket is sleeved outside the bearing, and the bearing is connected with the flange through the elastic gasket.

2. The bearing mounting structure according to claim 1,

patterns protruding towards the bearing direction are uniformly arranged on the surface of the elastic washer.

3. The bearing mounting structure according to claim 2,

the high points of the patterns are in interference fit with the outer side of the bearing.

4. The bearing mounting structure according to claim 3,

the elastic washer is integrally formed and made of spring steel.

5. The bearing mounting structure according to any one of claims 1 to 4,

the bearing assembly also comprises a bearing cover which is arranged below the bearing and is connected with the lower surface of the bearing;

the outer edge of the bearing cover is connected with the flange.

6. The bearing mounting structure according to claim 5,

the bearing cover comprises a connecting portion and an extending portion which are sequentially connected, the connecting portion is connected with the lower surface of the bearing, the connecting portion faces the flange direction and extends to form a plurality of extending portions, and the extending portions abut against the flange and are used for fixing the bearing cover.

7. The bearing mounting structure according to claim 6,

the bearing comprises a rotating inner ring and a fixed outer ring, and the connecting part is connected with the outer ring;

the extension is in interference fit with the flange.

8. A vacuum pump is characterized in that the vacuum pump is provided with a vacuum pump body,

comprising a bearing mounting structure according to any one of claims 1-7.

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