CN113864326A

CN113864326A - Bearing and bearing device

Info

Publication number: CN113864326A
Application number: CN202111176576.XA
Authority: CN
Inventors: 侯治亚; 徐镜峰; 王素霞
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2021-12-31

Abstract

A bearing and a bearing device, the bearing comprising: a bearing outer race; the bearing inner ring is coaxially arranged with the bearing outer ring and is positioned on the inner side of the bearing outer ring, and at least one of the bearing outer ring and the bearing inner ring is provided with an annular groove along the circumferential direction; the retainer, coaxial set up in the bearing inner race with between the bearing inner race, the retainer is provided with annular protrusion along circumference, the protruding embedding of annular groove to form sealedly between the terminal surface of retainer and bearing inner race and/or the terminal surface of bearing inner race, need not to install the shield, can avoid the raceway slight deformation or even bearing early failure because of installation shield leads to, thereby can prolong bearing life on the basis of guaranteeing the sealed effect of bearing.

Description

Bearing and bearing device

Technical Field

The embodiment of the invention relates to the technical field of machinery, in particular to a bearing and a bearing device.

Background

A rolling bearing is a precise mechanical element that reduces friction loss by changing sliding friction between a running shaft and a bearing housing into rolling friction. The rolling bearing comprises a bearing inner ring, a bearing outer ring, rolling bodies and a retainer, and in order to improve the sealing performance of the bearing, the bearing is usually provided with a dust cover. The dust cover is an annular cover and covers the inner space of the bearing.

However, the existing dust cap is a metal stamping part, has low dimensional accuracy (compared with a grinding process), and is mounted on the bearing outer ring through interference, so that the bearing outer ring is extruded to deform due to the low dimensional accuracy of the dust cap, the raceway slightly deforms, and finally the bearing fails early.

Therefore, how to prolong the service life of the bearing on the basis of ensuring the sealing effect of the bearing becomes a technical problem which needs to be solved urgently by the technical personnel in the field.

Disclosure of Invention

The technical problem solved by the embodiment of the invention is to prolong the service life of the bearing.

To solve the above problem, an embodiment of the present invention provides a bearing, including:

a bearing outer race;

the bearing inner ring is coaxially arranged with the bearing outer ring and is positioned on the inner side of the bearing outer ring, and at least one of the bearing outer ring and the bearing inner ring is provided with an annular groove along the circumferential direction;

the retainer is coaxially arranged between the bearing inner ring and the bearing outer ring, an annular bulge is arranged on the retainer along the circumferential direction, and the annular bulge is embedded into the annular groove.

Optionally, one of the bearing inner ring and the bearing inner ring comprises a first ring and a second ring which are axially juxtaposed, the first ring comprises a fixedly connected raceway portion and a retaining shoulder portion, the second ring is arranged on the side opposite to the retaining shoulder portion and is in contact with the raceway portion, and the distance from the first ring to the bearing axis is equal to the distance from the retaining shoulder portion to the bearing axis along the side close to the retainer.

Optionally, the annular groove includes a first annular groove and a second annular groove, the first annular groove is provided in the shoulder portion of the first ferrule, the second annular groove is provided in the second ferrule, the annular protrusion includes a first annular protrusion and a second annular protrusion, the first annular protrusion is embedded in the first annular groove, and the second annular protrusion is embedded in the second annular groove.

Optionally, the shape of the annular groove matches the shape of the annular protrusion.

Optionally, the bearing inner ring comprises a first ring and a second ring which are axially parallel, the annular groove further comprises a third annular groove, and the third annular groove is formed in the bearing outer ring along the circumferential direction on one side of the bearing outer ring facing the bearing inner ring; the annular bulge further comprises a third annular bulge, the third annular bulge is arranged on one side, close to the bearing outer ring, of the retainer, and the third annular bulge is embedded into the third annular groove.

Optionally, the shape of the third annular projection matches the shape of the third annular groove.

Optionally, a fourth annular groove is circumferentially formed at an axially outer end of the cage.

In order to solve the above problem, an embodiment of the present invention further provides a bearing device, which includes a shaft, a bearing seat, and the bearing described above, wherein one of the bearing outer ring and the bearing inner ring is in interference fit with the bearing seat, and the other of the bearing outer ring and the bearing inner ring is sleeved on the shaft.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:

the bearing provided by the embodiment of the invention is characterized by comprising the following components:

a bearing outer race;

the retainer is coaxially arranged between the bearing inner ring and the bearing outer ring and is in clearance fit with the bearing outer ring and the bearing inner ring respectively, the retainer is provided with annular bulges along the circumferential direction, and the annular bulges are embedded into the annular grooves.

It can be seen that, in the bearing provided by the embodiment of the invention, in the working process of the bearing, relative motion exists among the bearing inner ring, the bearing outer ring and the retainer, and the annular bulge of the retainer is embedded into the bearing inner ring and/or the annular groove, so that sealing is formed between the retainer and the end surface of the bearing inner ring and/or the end surface of the bearing outer ring, which is equivalent to that the retainer has a dustproof function, so that a bearing dustproof cover can be cancelled, slight deformation of a raceway and even early failure of the bearing caused by installation of the dustproof cover can be avoided, and the service life of the bearing can be prolonged on the basis of ensuring the sealing effect of the bearing. Furthermore, the production and assembly cost of the bearing can be reduced because the dust cover does not need to be purchased or produced.

In an alternative scheme, in the bearing provided by the embodiment of the invention, the bearing inner ring comprises the first ring and the second ring which are axially parallel, the annular groove further comprises a third annular groove, and the third annular groove is formed in the bearing outer ring along the circumferential direction on one side of the bearing outer ring facing the bearing inner ring; the annular bulge further comprises a third annular bulge, the third annular bulge is arranged on one side, close to the bearing outer ring, of the retainer, and the third annular bulge is embedded into the third annular groove. Because the retainer forms a seal with the end surfaces of the bearing inner ring and the bearing outer ring, the sealing performance of the bearing is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of a partial structure of a bearing;

FIG. 2 is a schematic view of a partial structure of a bearing provided by an embodiment of the present invention;

fig. 3 is another partial structural schematic diagram of a bearing provided in an embodiment of the present invention.

Wherein: 1-bearing outer ring; 2-bearing inner race; 3-a cage; 4-dust cover; 5-a retainer ring; 10-bearing outer race; 20-bearing inner race; 210-a first ferrule; 30-a cage; 40-a raceway portion; 50-shoulder stop; 21-a first annular groove; 31-a first annular projection; 220-a second ferrule; 22-a second annular groove; 30-a cage; 32-a second annular projection; 23-a third annular groove; 33-a third annular projection; 24-fourth annular groove.

Detailed Description

Known from the background art, when the shield of bearing was installed on the bearing outer race, lead to the bearing outer race to receive the extrusion to produce and warp because of shield size precision is low for the raceway produces slight deformation, finally leads to the bearing early failure.

Now, the reason for the shortened service life of the bearing is analyzed by combining the bearing.

Referring to fig. 1, fig. 1 is a partial structural schematic view of a bearing.

As shown in the figure, the bearing comprises a bearing outer ring 1 and a bearing inner ring 2, and rolling bodies are guided and arranged between the bearing outer ring 1 and the bearing inner ring 2 through a retainer 3. The retainer ring 5 is axially arranged side by side with the bearing inner ring 2 and plays a role in stopping the axial movement of the rolling body. The shield 4 is installed on bearing inner race 1, with 1 interference fit of bearing inner race, and shield 4 is the annular cover structure, covers the bearing inner space to improve bearing sealing performance. However, the retainer 3 is usually a metal stamping part, and compared with the grinding process, the dimensional accuracy of the stamping process is low, so that when the dust cap 4 is mounted on the bearing outer ring 1, the bearing outer ring 1 is extruded to deform due to the low dimensional accuracy of the dust cap 4, so that the raceway slightly deforms, and finally the bearing fails early, and the service life of the bearing is shortened.

In order to prolong the service life of the bearing, the embodiment of the invention provides a bearing and a bearing device, and the technical scheme in the embodiment of the invention is clearly and completely described below by combining the drawings in the embodiment of the invention, and obviously, the described embodiment is only a part of the embodiment of the invention, but not the whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the indication of the direction or the positional relationship referred to in the present specification is based on the direction or the positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and it is not intended to indicate or imply that the indicated device must have a specific direction, be configured in a specific direction, and thus, should not be construed as limiting the present invention.

Referring to fig. 2, fig. 2 is a schematic partial structure diagram of a bearing according to an embodiment of the present invention.

The bearing provided by the embodiment of the invention comprises:

a bearing outer race 10;

the bearing inner ring 20 is coaxially arranged with the bearing outer ring 10 and is positioned on the inner side of the bearing outer ring 10, and at least one of the bearing outer ring 10 and the bearing inner ring 20 is provided with an annular groove along the circumferential direction;

and the retainer 30 is coaxially arranged between the bearing inner ring 20 and the bearing outer ring 10, and the retainer 30 is provided with an annular bulge along the circumferential direction, and the annular bulge is embedded into the annular groove.

At least one of the bearing outer ring 10 and the bearing inner ring 20 is circumferentially provided with an annular groove, which means that an annular groove is provided on one side of the bearing outer ring 10 close to the holder 30, or an annular groove is provided on one side of the bearing inner ring 20 close to the holder 30, or both one side of the bearing outer ring 10 close to the holder 30 and one side of the bearing inner ring 20 close to the holder 30 are provided with annular grooves, correspondingly, when the bearing inner ring 20 is provided with an annular groove, one side of the holder 30 close to the bearing inner ring 20 is circumferentially provided with an annular protrusion which is embedded in the annular groove; when the bearing outer ring 10 is provided with the annular groove, one side of the retainer 30 close to the bearing outer ring 10 is provided with an annular bulge along the circumferential direction, and the annular bulge is embedded into the annular groove; when the annular grooves are formed on both the side of the bearing outer ring 10 close to the retainer 30 and the side of the bearing inner ring 20 close to the retainer 30, the radial inner side and the radial outer side of the retainer 30 are provided with annular protrusions for being embedded into the annular grooves of the bearing inner ring 20 and the annular grooves of the bearing outer ring 10.

The annular protrusion of the retainer 30 extends towards the bearing inner ring 20 or the bearing outer ring 10, the annular protrusion of the retainer 30 may be perpendicular to the axis of the retainer 30, and the included angle between the annular protrusion and the axis of the retainer 30 may also be a non-right angle.

The shape of the annular groove is not limited, for example, the opening shape of the radial cross section of the annular groove may be trapezoidal, rectangular, circular arc, etc., and the shape of the annular protrusion is not limited as long as it is ensured that the annular protrusion of the retainer 30 can be inserted into the annular groove. In a specific embodiment, the shape of the annular groove may match the shape of the annular protrusion in order to improve the sealing performance.

To reduce friction, the annular projection of the cage 30 is inserted into the annular groove, but there may be a clearance fit between the annular groove and the annular projection of the cage 30, i.e., the annular projection is not in contact with the bottom wall of the annular groove.

According to the bearing provided by the embodiment of the invention, in the working process of the bearing, relative motion exists among the bearing inner ring 20, the bearing outer ring 10 and the retainer 30, and the annular bulge of the retainer 30 is embedded into the annular groove of the bearing inner ring 20 and/or the annular groove of the bearing outer ring 10, so that sealing is formed between the retainer 30 and the end surface of the bearing inner ring 20 and/or the end surface of the bearing outer ring 10, namely the retainer 30 has a dustproof function, a bearing dustproof cover can be omitted, slight deformation of a raceway and even early failure of the bearing caused by installation of the dustproof cover can be avoided, and the service life of the bearing can be prolonged on the basis of ensuring the sealing effect of the bearing. Furthermore, the production and assembly cost of the bearing can be reduced because the dust cover does not need to be purchased or produced.

In a specific embodiment, for easy mounting and dismounting, one of the bearing inner ring 20 and the bearing inner ring 20 comprises a first ring 210 and a second ring 220 which are axially juxtaposed, the first ring 210 comprises a fixedly connected raceway portion 40 and a retaining shoulder portion 50, the second ring 220 is arranged on the side opposite to the retaining shoulder portion 50 and in contact with the raceway portion 40, and the distance from the first ring 210 to the bearing axis is equal to the distance from the retaining shoulder portion 50 to the bearing axis along the side close to the cage 30. Of course, in other embodiments, the shoulder portion 50 of the raceway portion 40 may be separate 2 rings axially juxtaposed, i.e., the inner bearing ring 20 or the outer bearing ring 10 may contain 3 rings.

By designing the rotating collars as the first collar 210 and the second collar 220, the mounting and dismounting of the bearing is facilitated. The raceway portion 40 of the first race 210 serves to provide a raceway for the rolling elements, and the retaining shoulder portion 50 of the first race 210 serves to stop the axial movement of the rolling elements. The second race 220 is disposed on the opposite side of the first race 210 from the shoulder 50 (as shown in fig. 2, the shoulder 50 and the second race 220 are respectively located at both ends of the raceway portion 40), and the second race 220 is used to stop the axial movement of the rolling elements. The second race 220 and the catch shoulder 50 are symmetrical about a central cross-section of the raceway portion 40.

One of the bearing inner ring 20 and the bearing inner ring 20 includes a first ring 210 and a second ring 220 that are axially juxtaposed, which means that the bearing outer ring 10 may include the first ring 210 and the second ring 220, or the bearing inner ring 20 may include the first ring 210 and the second ring 220.

For convenience of description, the bearing inner race 20 including the first and second races 210 and 220 will be described as an example.

Specifically, as shown in fig. 2, in a specific embodiment, the annular grooves include a first annular groove 21 and a second annular groove 22, the first annular groove 21 is opened on the blocking shoulder 50 of the first ferrule 210, the second annular groove 22 is opened on the second ferrule 220, the annular protrusions include a first annular protrusion 31 and a second annular protrusion 32, the first annular protrusion 31 is embedded in the first annular groove 21, and the second annular protrusion 32 is embedded in the second annular groove 22.

The shape of the first annular groove 21 and the second annular groove 22 may be the same or different, as long as it is ensured that the annular protrusion of the retainer 30, which is fitted to the retaining shoulder 50 side, can be fitted into the first annular groove 21 of the retaining shoulder 50, and similarly, it is ensured that the annular protrusion of the retainer 30, which is fitted to the second race 220 side, can be fitted into the second annular groove 22.

It will be readily appreciated that the annular recess defined by the shoulder 50 may or may not be the same shape as the annular recess defined by the second collar 220.

As shown in fig. 3, in order to further improve the sealing performance, in a specific embodiment, the bearing inner ring 20 encloses a first ring 210 and a second ring 220 which are axially juxtaposed, the annular groove further includes a third annular groove 23, and the third annular groove 23 is opened on the side of the bearing outer ring 10 facing the bearing inner ring 20, along the circumferential direction, on the bearing outer ring 10; the annular protrusion further comprises a third annular protrusion 33, the third annular protrusion 33 is disposed on one side of the retainer 30 close to the bearing outer ring 10, and the third annular protrusion 33 is embedded in the third annular groove 23.

In order to reduce friction, the third annular protrusion 33 of the retainer 30 is inserted into the third annular groove 23, but there may be a clearance fit between the third annular groove 23 and the third annular protrusion 33 of the retainer 30, i.e., the third annular protrusion 33 is not in contact with the bottom of the third annular groove 23.

In a specific embodiment, the shape of the third annular projection 33 matches the shape of the third annular groove 23 to improve the sealing performance. Of course, in other embodiments, the shape of the third annular protrusion 33 and the shape of the third annular groove 23 may be different, as long as the third protrusion can be ensured to be inserted into the third annular groove 23.

In a specific embodiment, as shown in fig. 2, in order to save cost and reduce weight, the axial outer end portion of the retainer 30 is circumferentially provided with a fourth annular groove 24.

In the working process of the bearing, the bearing inner ring, the bearing outer ring and the retainer move relatively, and the annular bulge of the retainer is embedded into the bearing inner ring and/or the annular groove, so that sealing is formed between the retainer and the end surface of the bearing inner ring and/or the end surface of the bearing outer ring, namely the retainer has a dustproof function, a bearing dustproof cover can be omitted, slight deformation of a roller path caused by installation of the dustproof cover and even early failure of the bearing can be avoided, and the service life of the bearing can be prolonged on the basis of ensuring the sealing effect of the bearing. Furthermore, the production and assembly cost of the bearing can be reduced because the dust cover does not need to be purchased or produced.

Although the embodiments of the present invention have been disclosed, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A bearing, comprising:

a bearing outer race;

2. The bearing of claim 1, wherein one of the inner race and the inner race comprises first and second axially juxtaposed races, the first race including a fixedly connected raceway portion and a retaining shoulder portion, the second race disposed on an opposite side of the retaining shoulder portion and in contact with the raceway portion, the first race being spaced from the bearing axis by a distance equal to the retaining shoulder portion along a side adjacent the cage.

3. The bearing of claim 2, wherein the annular groove comprises a first annular groove and a second annular groove, the first annular groove opening into the shoulder of the first ring, the second annular groove opening into the second ring, and the annular protrusion comprises a first annular protrusion and a second annular protrusion, the first annular protrusion fitting into the first annular groove, and the second annular protrusion fitting into the second annular groove.

4. The bearing of claim 1, wherein the shape of the annular groove matches the shape of the annular protrusion.

5. The bearing of claim 3, wherein the bearing inner race comprises a first ring and a second ring which are axially juxtaposed, the annular groove further comprises a third annular groove, and the bearing outer race is circumferentially provided with the third annular groove on a side of the bearing outer race facing the bearing inner race; the annular bulge further comprises a third annular bulge, the third annular bulge is arranged on one side, close to the bearing outer ring, of the retainer, and the third annular bulge is embedded into the third annular groove.

6. The bearing of claim 5, wherein the shape of the third annular projection matches the shape of the third annular groove.

7. The bearing according to any one of claims 1 to 6, wherein a fourth annular groove is circumferentially formed at an axially outer end portion of the retainer.

8. A bearing arrangement comprising a shaft, a bearing seat and a bearing as claimed in any one of claims 1 to 7, one of the outer race and the inner race having an interference fit with the bearing seat, the other of the outer race and the inner race being journalled in the shaft.