CN216390667U - Bearing device, motor and cooling fan - Google Patents

Abstract

The embodiment of the application provides a bearing device, motor and radiator fan, the bearing device includes: a cylindrical tower portion extending in an axial direction; a bearing pressed into the tower; and a snap ring that is press-fitted into the tower portion and that contacts an end surface of one axial end of the bearing, wherein the snap ring is a circular ring having an opening in a circumferential direction. From this, utilize the snap ring to press the bearing in the tower portion, can prevent that the bearing from pulling out outward, reduce the risk that the bearing drops to because the snap ring has the opening, can be convenient for put into the tower portion with the snap ring under the condition that increases the pretightning force.

Description

Bearing device, motor and cooling fan

Technical Field

The embodiment of the application relates to the electromechanical field, in particular to a bearing device, a motor and a cooling fan.

Background

In the motor, the bearing is usually disposed in a tower portion in the housing, and the bearing is prevented from moving in the axial direction by interference fit with the tower portion.

It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.

SUMMERY OF THE UTILITY MODEL

The inventor finds that in the prior art, the bearing only prevents falling off through interference fit with the tower part, and no other anti-falling design exists for the bearing, however, in some use scenarios, for example, when the motor is used for a vehicle-mounted product, the motor will be subjected to vibration during driving of an automobile, or when the motor is used for a fan, the fan may select different directions during actual installation, and the bearing may loosen, and even have a risk of falling off from the tower part.

In order to solve at least one of the above problems or other similar problems, embodiments of the present application provide a bearing device, a motor, and a heat dissipation fan.

According to a first aspect of embodiments of the present application, there is provided a bearing device including: a cylindrical tower portion extending in an axial direction; a bearing pressed into the tower; and a snap ring that is press-fitted into the tower portion and that contacts an end surface of one axial end of the bearing, wherein the snap ring is a circular ring having an opening in a circumferential direction.

In at least one embodiment, an axial end portion of the snap ring on a side close to the bearing protrudes in a direction close to the bearing to form a protruding portion.

In at least one embodiment, the axial cross-section of the protrusion is triangular, and the angle of the triangle near the bearing is acute.

In at least one embodiment, on a plane of the axial cross section, one side of the acute angle closer to the radial outer side is located on a straight line of the outer peripheral surface of the snap ring, and the other side of the acute angle is in contact with the bearing.

In at least one embodiment, the acute angle is 45 °.

In at least one embodiment, the circumferential dimension of the opening is not less than the difference between the circumference of the circle on which the outer circumferential surface of the snap ring is located and the circumference of the circle on which the inner circumferential surface of the tower portion is located.

In at least one embodiment, the outer diameter of the snap ring is greater than the inner diameter of the tower.

In at least one embodiment, the snap ring is steel.

According to another aspect of embodiments of the present application, there is provided a motor including a stationary portion and a rotating portion including a shaft extending in an axial direction, the rotating portion rotating with respect to the stationary portion, wherein the stationary portion includes: the bearing assembly of any preceding embodiment, the bearing assembly being disposed radially outward of the shaft.

According to still another aspect of embodiments of the present application, there is provided a heat dissipation fan including: the motor described in the previous embodiment; and a blade provided at one axial end of a shaft of the motor to rotate with the shaft.

One of the beneficial effects of the embodiment of the application lies in: utilize the snap ring to press the bearing in the tower portion, can prevent that the bearing from pulling out outward, reduce the risk that the bearing drops to because the snap ring has the opening, can be convenient for put into the tower portion with the snap ring under the condition that increases the pretightning force.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is a cross-sectional view of a fan in an axial direction according to an embodiment of the present application.

Fig. 2 is a partially enlarged view of fig. 1.

FIG. 3 is a perspective view of a snap ring of an embodiment of the present application.

FIG. 4 is a side view of a snap ring of an embodiment of the present application.

FIG. 5 is a top view of a snap ring of an embodiment of the present application.

FIG. 6 is a schematic view of a snap ring separated from a bearing according to an embodiment of the present application.

FIG. 7 is an enlarged partial schematic view of a snap ring in contact with a bearing according to an embodiment of the present application.

Detailed Description

The foregoing and other features of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the application are disclosed in detail as being indicative of some of the embodiments in which the principles of the application may be employed, it being understood that the application is not limited to the described embodiments, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.

In the embodiments of the present application, the terms "first", "second", and the like are used for distinguishing different elements by reference, but do not denote a spatial arrangement, a temporal order, or the like of the elements, and the elements should not be limited by the terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," and the like, refer to the presence of stated features, elements, components, and do not preclude the presence or addition of one or more other features, elements, components, and elements.

In the embodiments of the present application, the singular forms "a", "an", and the like may include the plural forms and should be interpreted broadly as "a" or "an" and not limited to the meaning of "a" or "an"; furthermore, the term "comprising" should be understood to include both the singular and the plural, unless the context clearly dictates otherwise. Further, the term "according to" should be understood as "at least partially according to … …," and the term "based on" should be understood as "based at least partially on … …," unless the context clearly dictates otherwise.

In the following description of the embodiments of the present application, for the sake of convenience of description, a radial direction around the center axis O of the rotating shaft of the motor is referred to as a "radial direction", a direction around the center axis O is referred to as a "circumferential direction", a direction along the center axis O or a direction parallel thereto is referred to as an "axial direction", a side away from the center axis O in the radial direction is referred to as a "radially outer side", a side closer to the center axis O in the radial direction is referred to as a "radially inner side", a cylindrical surface extending in the axial direction is referred to as a "circumferential surface", a surface closer to the "radially outer side" is referred to as an "outer circumferential surface", and a surface closer to the "radially inner side" is referred to as an "inner circumferential surface". It should be noted that these are for convenience of illustration only and do not limit the orientation of the motor during use and manufacture.

Embodiments of the present application will be described below with reference to the drawings.

Embodiments of the first aspect

Embodiments of the present invention provide a bearing device, which may be configured in a motor, which may be a motor of a fan, fig. 1 is a cross-sectional view of the fan including the bearing device of the embodiments of the present invention in an axial direction, and fig. 2 is an enlarged view of a portion within a dashed-line frame in fig. 1, showing the bearing device of the embodiments of the present invention.

As shown in fig. 1 and 2, the bearing device 100 includes a tower 110, a bearing 120, and a snap ring 130. The tower 110 is cylindrical and extends in the axial direction; the bearing 120 and the snap ring 130 are pressed into the tower portion 110, and the snap ring 130 contacts an end surface of one axial end of the bearing 120 (for example, an upper end surface of the bearing 120 shown in fig. 2).

In some embodiments, the tower 110 is integrated with the casing of the motor, and may be integrally formed with the casing or separately formed, which is not limited in this application.

In addition, the structure of the bearing 120 is not limited in the embodiments of the present application, and the related art may be referred to for specific structure.

FIG. 3 is a perspective view of a snap ring of an embodiment of the present application. As shown in fig. 3, the snap ring 130 is a circular ring having an opening G in the circumferential direction.

Therefore, the bearing 120 is pressed into the tower 110 by the snap ring 130, the bearing 120 can be prevented from being pulled out, the risk of the bearing 120 falling off can be reduced, and the snap ring 130 can be easily put into the tower 110 when the snap ring 130 is designed to increase the preload force (for example, the snap ring 130 is designed such that the outer diameter of the snap ring 130 is larger than the inner diameter of the tower 110) because the snap ring 130 has the opening G.

In at least one embodiment, as shown in fig. 2, an axial end portion of the snap ring 130 on a side close to the bearing 120 (e.g., a lower end of the snap ring 130) protrudes in a direction close to the bearing 120, forming a protrusion 131.

Fig. 4 is a side view of a snap ring of an embodiment of the present application, and fig. 5 is a top view of a snap ring of an embodiment of the present application.

In at least one embodiment, as shown in FIG. 4, the axial cross-section of the protrusion 131 is triangular, and the angle θ of the triangle near the bearing 120 is acute. In the present embodiment, "axial section" means "a section taken along the axis of the motor".

In the embodiment of the present application, the angle θ may be any acute angle, may be an angle in the range of 30 ° to 60 °, and may be 45 °.

Fig. 6 is a schematic view of the snap ring separated from the bearing, and fig. 7 is a partially enlarged schematic view of the snap ring contacting the bearing.

In general, the end of the bearing is chamfered during machining, and the angle of the chamfer is generally 45 °. As shown in fig. 5, when the angle θ is 45 °, the surface 131a of the protrusion 131 close to the bearing 120 is parallel to the chamfered surface 120a of the bearing 120, and as shown in fig. 6, when the snap ring 130 is in contact with the bearing 120, the surface 131a (not shown) of the protrusion 131 (not shown) is in contact with the chamfered surface 120a (not shown) of the bearing 120. If the bearing 120 receives a force F in a direction perpendicular to the contact surface, the force F is divided into a component force in the axial direction (hereinafter referred to as "vertical direction") and a component force perpendicular to the axial direction (hereinafter referred to as "horizontal direction") at the position of the contact surface, and both the component force in the horizontal direction and the component force in the vertical direction are √ 2/2F, where the component force in the horizontal direction is applied to the snap ring 130 to expand the snap ring 130 and further to be in close contact with the tower 110, thereby preventing the bearing 120 from falling off. Thus, by setting the angle θ to 45 °, on the one hand, the snap ring 130 can be brought into better contact with the bearing 120, and on the other hand, the force applied to the bearing 120 can be resolved, so that the force applied to the bearing 120 in the vertical direction is reduced, and the risk of the bearing 120 coming off is reduced, and further, the snap ring 130 can be brought into closer contact with the tower portion, and the bearing 120 can be further prevented from being pulled out.

In at least one embodiment, as shown in fig. 4, on a plane where the axial cross section of the protrusion 131 is located, one side of the angle θ on the radially outer side is located on a straight line L where the outer peripheral surface of the snap ring 130 is located, and the other side of the angle θ is in contact with the bearing 120. That is, as shown in fig. 3, the outer peripheral surface 130a and the inner peripheral surface 130b of the snap ring 130 are cylindrical surfaces, the axial height of the outer peripheral surface 130a is higher than the axial height of the inner peripheral surface 130b, and the surface 131a of the protruding portion 131 is an inclined surface inclined from the radially outer side to the radially inner side, and connects the outer peripheral surface 130a and the inner peripheral surface 130 b. When the snap ring 130 abuts the bearing 120, the surface 131a of the projection 131 contacts the bearing 120. Thereby, the outer peripheral surface 130a of the snap ring 130 can be brought into close contact with the inner peripheral surface of the tower 110, and the bearing 120 can be further prevented from being pulled out.

In at least one embodiment, the circumferential dimension of the opening G is not less than the difference between the circumference of the circle on which the outer circumferential surface 130a of the snap ring 130 is located and the circumference of the circle on which the inner circumferential surface of the tower 110 is located. For example, as shown in fig. 5, the outer peripheral surface 130a of the snap ring 130 has a circle having a diameter D, a circumferential length C ═ pi ×, D, a circumferential dimension α of the opening G, and a length C' ═ C- α of the outer peripheral surface 130a of the snap ring 130, and as shown in fig. 2, the inner peripheral surface of the tower portion 110 has a diameter D, and the inner peripheral length C ═ pi ×, D of the tower portion 110. In order to ensure that the snap ring 130 can be smoothly pressed in, C' is less than or equal to C, namely alpha is more than or equal to C-C.

In at least one embodiment, the outer diameter of the snap ring 130 (the diameter D of the circle in which the outer peripheral surface 130a of the snap ring 130 is located) is greater than the inner diameter of the tower 110 (i.e., the diameter D of the inner peripheral surface of the tower 110). In order to ensure that an expansion force (also referred to as "preload") exists between the snap ring 130 and the inner circumferential surface of the tower portion 110 after the snap ring 130 is pressed into the tower portion 110, D > D needs to be satisfied.

In at least one embodiment, the snap ring 130 may be steel. Therefore, the snap ring 130 can have elastic force, when the snap ring 130 is placed in the tower 110, the snap ring 130 can be pressed to make the opening G as small as possible, so that the snap ring 130 can be conveniently placed in the tower 110, and after the snap ring 130 is placed in the tower 110, the snap ring 130 can be propped open by the action of the elastic force, so that a pretightening force exists between the pretightening force and the inner circumferential surface of the tower 110, and the pretightening force enables the snap ring 130 to be reliably fixed in the tower 110, so that the bearing 120 is prevented from being pulled out.

The material of the snap ring 130 is not limited in the embodiment of the present application, and the snap ring 130 may also be made of other metal materials or other materials with elasticity.

According to the embodiment, the bearing is pressed in the tower part by the clamping ring, the bearing can be prevented from being pulled out, the risk that the bearing falls off is reduced, and the clamping ring is provided with the opening, so that the clamping ring can be conveniently placed in the tower part.

Embodiments of the second aspect

An embodiment of the present application provides a motor 200, the motor 200 includes a stationary portion and a rotating portion, as shown in fig. 1, the rotating portion includes a shaft 210 extending along an axial direction, the rotating portion rotates relative to the stationary portion, wherein the stationary portion includes: in the bearing device 100 according to the embodiment of the first aspect, the bearing device 100 is disposed radially outward of the shaft 210 and radially opposite to the shaft 210.

Since the structure of the bearing device 100 has been described in detail in the embodiment of the first aspect, the contents thereof are incorporated herein, and the description thereof is omitted here.

Further, the stationary portion of the motor 200 may also include a stator, coils, a casing, etc.; the rotating portion of the motor 200 may include a rotor, a rotor holder, and the like. The structure of the motor 200 is not limited in the embodiments of the present application, and specific reference may be made to related technologies, and descriptions thereof are omitted here.

Examples of the third aspect

The embodiment of the present application provides a heat dissipation fan, for example, the heat dissipation fan shown in fig. 1, as shown in fig. 1, the heat dissipation fan 1 includes a motor 200 and a blade 300 according to the embodiment of the second aspect, and the blade 300 is disposed at one axial end of a shaft 210 of the motor 200 and rotates with the shaft 210.

Since the structure of the motor 200 has been described in detail in the embodiment of the second aspect, the contents thereof are incorporated herein, and the description thereof is omitted here.

In addition, the heat dissipation fan 1 may further include other components, such as a fan housing and the like. The structure of the heat dissipation fan 1 is not limited in the embodiments of the present application, and specific reference may be made to related technologies, and descriptions thereof are omitted here.

The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.

Claims (10)

1. A bearing device, the bearing device comprising:

a cylindrical tower portion extending in an axial direction;

a bearing pressed into the tower; and

a snap ring pressed into the tower and contacting an end surface of one axial end of the bearing,

the clamping ring is characterized in that the clamping ring is a circular ring with an opening in the circumferential direction.

2. The bearing device of claim 1,

the axial end portion of the snap ring on the side close to the bearing protrudes in the direction close to the bearing to form a protruding portion.

3. The bearing device of claim 2,

the shaft section of the protruding part is triangular, and the angle of the triangle close to the bearing is an acute angle.

4. The bearing device of claim 3,

on the plane of the shaft section, one side of the acute angle close to the radial outer side is located on the straight line of the outer peripheral surface of the snap ring, and the other side of the acute angle is in contact with the bearing.

5. The bearing device of claim 3,

the acute angle is 45 °.

6. The bearing device according to any one of claims 1 to 5,

the circumferential dimension of the opening is not less than the difference between the circumferential length of a circle on which the outer circumferential surface of the snap ring is located and the circumferential length of a circle on which the inner circumferential surface of the tower portion is located.

7. The bearing device according to any one of claims 1 to 5,

the outer diameter of the clamping ring is larger than the inner diameter of the tower part.

8. The bearing device according to any one of claims 1 to 5,

the snap ring is made of steel.

9. A motor includes a stationary portion and a rotating portion including a shaft extending in an axial direction, the rotating portion rotating with respect to the stationary portion,

it is characterized in that the preparation method is characterized in that,

the stationary portion includes:

the bearing device according to any one of claims 1 to 8,

the bearing device is disposed radially outward of the shaft.

10. A heat dissipation fan, comprising:

the motor of claim 9; and

a vane provided at one axial end of a shaft of the motor to rotate with the shaft.

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