WO2022061591A1

WO2022061591A1 - Sealing cover and bearing assembly

Info

Publication number: WO2022061591A1
Application number: PCT/CN2020/117159
Authority: WO
Inventors: 段耀凯; 王素霞; 贾宪林; 王海
Original assignee: 舍弗勒技术股份两合公司; 段耀凯
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2022-03-31

Abstract

A sealing cover (S), used for being sleeved on an axial end portion of an outer ring (B2) of a bearing. The sealing cover (S) comprises an inner sleeve (10) and an outer cover (20) which are both ring-shaped, the outer cover (20) comprises a blocking ring (22) for partially extending to the space between an inner ring (B1) and the outer ring (B2) of the bearing in the radial direction (R) of the sealing cover (S) so as to block foreign objects from entering the inside of the bearing, the inner sleeve (10) is sleeved on the outer ring (B2), the outer cover (20) is sleeved on the outer circumference of the inner sleeve (10), and the elastic modulus of the inner sleeve (10) is smaller than that of the outer cover (20) and of the outer ring (B2). The present invention further relates to a bearing assembly comprising the sealing cover (S).

Description

Seal Cover and Bearing Assembly

technical field

The present invention relates to the field of bearings, and in particular to a sealing cover for a bearing and a bearing assembly including the same.

Background technique

Figure 1 shows a partial structure of a cylindrical roller bearing assembly for a bogie of a train, which includes a double row cylindrical roller bearing (hereinafter also referred to as a bearing), a bearing mounted on one end of an inner ring B1 of the bearing. The retaining ring W and the two sealing caps S0 installed on both ends of the outer ring B2 of the bearing. An annular sealing cover S0 extends from the outer ring B2 to a position close to the inner ring B1 (not in contact with the inner ring B1 ) to block foreign matter from entering the inside of the bearing.

The sealing cover S0 is usually formed by stamping from a steel material. The sealing cover S0 is installed to the outer circumference of the outer ring B2 through a tight fit with a large amount of interference. However, this fitting relationship is likely to cause unexpected deformation of the outer ring B2 in the radial direction, resulting in an unsatisfactory roundness of the outer ring B2. expected. The test shows that when the interference between the sealing cover S0 and the outer ring B2 increases from 0.1mm to 0.32mm in the radial direction, the deformation of the outer ring B2 on the radial side increases from 0.014mm to 0.035mm (Fig. The dotted line in 10 shows the deformation of the outer ring B2 at different distances from the center of the bearing), which makes the roundness of the outer ring B2 after assembly with the sealing cover S0 worse, the bearing assembly with the sealing cover S0 assembled The outer diameter is outside the allowable range of design tolerances.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome or at least alleviate the above-mentioned deficiencies of the prior art, and to provide a sealing cover which is not easy to cause deformation of the bearing and a bearing assembly including the sealing cover.

According to a first aspect of the present invention, a sealing cover is provided, which is sleeved on an axial end portion of an outer ring of a bearing, wherein the sealing cover includes an inner sleeve and an outer cover, both of which are annular, and the outer the cover includes a retaining ring for extending partially between the inner ring and the outer ring of the bearing in the radial direction of the sealing cover to block foreign matter from entering the interior of the bearing,

The inner sleeve is sleeved on the outer ring, and the outer cover is sleeved on the outer circumference of the inner sleeve,

The elastic modulus of the inner sleeve is smaller than the elastic modulus of the outer cover and the outer ring.

In at least one embodiment, the inner sleeve includes a cylindrical body, the outer periphery of the body is formed with an inner fitting portion,

The outer cover includes an outer retaining ring located at the outer peripheral portion and protruding from the blocking ring in the axial direction of the sealing cover, and an outer matching portion is formed on the inner periphery of the outer retaining ring,

The inner fitting portion and the outer fitting portion are form-fittingly fitted.

In at least one embodiment, in the axial direction, the outer diameter of the inner matching portion is larger, and the inner diameter of the outer matching portion is larger as the direction goes toward the retaining ring.

In at least one embodiment, the outer peripheral surface of the inner fitting portion and the inner peripheral surface of the outer fitting portion are both tapered surfaces or a part of the tapered surfaces.

In at least one embodiment, the outer matching portion is formed into a complete ring shape, there are multiple inner matching portions, and a plurality of the inner matching portions are arranged along the circumference of the main body, and the adjacent inner matching portions are arranged in the circumferential direction of the main body. A notch recessed radially inward in the outer peripheral wall of the main body is formed between the parts, or

The inner matching portion is formed into a complete ring shape, there are multiple outer matching portions, and a plurality of the outer matching portions are arranged along the circumferential direction of the outer retaining ring. The notch of the inner peripheral wall of the outer retaining ring is recessed radially outward.

In at least one embodiment, the inner sleeve further comprises an annular end rim, the end rim is located at the end of the main body, the end rim extends outwardly beyond the inner fitting portion in the radial direction,

The outer retaining ring abuts against the end edge.

In at least one embodiment, the inner peripheral portion of the inner sleeve is formed with a convex portion protruding radially inward, and the convex portion is used for matching with a groove on the outer ring of the bearing.

In at least one embodiment, in the axial direction of the sealing cover, the convex portion is located at the end of the inner sleeve away from the retaining ring.

In at least one embodiment, the outer cover further includes an inner retaining ring located at the inner circumference thereof, the inner retaining ring protrudes from the retaining ring in the axial direction of the sealing cover and is used for the direction of the bearing to the bearing. Internal extension.

In at least one embodiment, the material of construction of the inner sleeve comprises plastic.

In at least one embodiment, the outer cover is constructed of a material comprising steel.

According to a second aspect of the present invention, there is provided a bearing assembly comprising a bearing and a sealing cover according to the present invention,

The bearing includes an inner ring, an outer ring and rolling bodies, and the sealing cover is mounted on the end of the outer ring.

In at least one embodiment, the sealing cover is not in contact with the inner ring and the rolling elements.

In at least one embodiment, the outer circumference of the outer ring is partially recessed radially inward to form an annular groove, and the inner sleeve partially extends into the groove to be positioned in the axial direction of the bearing .

In at least one embodiment, the bearing is a cylindrical roller bearing.

The sealing cover according to the present invention has a simple structure, is easy to install, and is not easy to cause deformation of the bearing.

The outer ring of the bearing assembly according to the present invention has good roundness, and the deformation of the outer ring before and after the sealing cover is installed is small.

Description of drawings

Figure 1 is a partial axial cross-sectional view of a possible bearing with a sealing cover installed.

Figure 2 is an axial cross-sectional view of a bearing assembly including a seal cover according to one embodiment of the present invention.

FIG. 3 is an enlarged schematic view of the circled portion in FIG. 2 .

4 is a schematic view of the inner sleeve of the sealing cap according to one embodiment of the present invention.

FIG. 5 is an axial cross-sectional view of the inner sleeve shown in FIG. 4 .

FIG. 6 is an enlarged schematic view of the circled portion in FIG. 5 .

7 is a schematic diagram of an outer cover according to one embodiment of the present invention.

FIG. 8 is an axial cross-sectional view of the outer cover shown in FIG. 7 .

FIG. 9 is an enlarged schematic view of the circled portion in FIG. 8 .

Figure 10 shows the deformation of the bearing after installation of different sealing covers.

Description of reference numbers:

S, S0 sealing cover; B1 inner ring; B2 outer ring; B3 rolling body; W retaining ring; B2a groove;

10 inner sleeve; 10a convex part; 11 main body; 12 end edge; 111 inner matching part; 112 notch;

20 outer cover; 21 outer buckle; 22 retaining ring; 23 inner buckle;

A axial; R radial.

detailed description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present invention, and are not used to exhaust all possible ways of the present invention, nor to limit the scope of the present invention.

Unless otherwise specified, referring to FIG. 2 , A represents the axial direction of the sealing cover, which is consistent with the axial direction of the bearing; R represents the radial direction of the sealing cover, and the radial direction R is consistent with the radial direction of the bearing.

Taking the double row cylindrical roller bearing for the bogie of the train (hereinafter also referred to as the bearing) as shown in Fig. 2 as an example, and in conjunction with Fig. 3 to Fig. 10, the bearing assembly and the seal included in the bearing assembly according to the present invention are introduced Cover S.

Referring to FIG. 2 , in this embodiment, the bearing assembly includes a bearing, a sealing cover S and a retaining ring W.

The bearing includes an inner ring B1, an outer ring B2, and rolling elements B3 located between the inner ring B1 and the outer ring B2. In order to facilitate the assembly of the bearing, an axial end of the inner ring B1 is provided with a retaining ring W, which is flush with the inner peripheral wall of the inner ring B1 on the radial inner side and extends beyond the outer peripheral wall of the inner ring B1 on the radial outer side.

Sealing covers S are provided on both axial ends of the bearing to block foreign matter from entering the inside of the bearing.

The sealing cover S is annular, and includes an inner sleeve 10 and an outer cover 20 that are assembled together. The inner sleeve 10 is sleeved on the outer periphery of the outer ring B2 in an interference fit, so as to be connected with the outer ring B2 in a non-rotatable manner. The outer cover 20 is sleeved on the outer periphery of the inner sleeve 10 with an interference fit.

The specific structure of the inner sleeve 10 will be described with reference to FIGS. 3 to 6 .

The elastic modulus of the inner sleeve 10 is smaller than the elastic modulus of the outer cover 20 and the outer ring B2. In this embodiment, the inner sleeve 10 may be made of plastic (or plastic), and more preferably glass fiber reinforced nylon (eg PA66-GF25).

The inner sleeve 10 includes a main body 11 and an end edge 12 protruding outward from the main body 11 in the radial direction R. As shown in FIG. The end edge 12 is located at one axial end of the main body 11 , and when the sealing cover S is assembled with the bearing, the end edge 12 is disposed toward the inner side of the bearing.

The outer peripheral portion of the main body 11 is formed with a plurality of inner matching portions 111 spaced apart in the circumferential direction, and the outer peripheral surface of each inner matching portion 111 is a part of the tapered surface. The smaller the outer diameter of the inner fitting portion 111 is. The tapered structure of the inner fitting portion 111 enables it to be positively engaged with the outer fitting portion 211 of the outer cover 20 described below.

Notches 112 are formed between the adjacent inner fitting parts 111 , that is, the outer peripheral wall of the main body 11 is partially recessed radially inward between the adjacent inner fitting parts 111 . The notches 112 allow the weight of the inner sleeve 10 to be reduced and the manufacturing material to be saved.

The inner peripheral surface of the inner sleeve 10 partially protrudes radially inward to form an annular convex portion 10a surrounding the inner sleeve 10 at the inner peripheral portion. In this embodiment, preferably, the convex portion 10a is located at the axial end portion where the end edge 12 of the inner sleeve 10 is located.

Accordingly, the outer periphery of the outer ring B2 is partially recessed radially inward to form an annular groove B2a. The protrusion 10a protrudes into the groove B2a, so that the inner sleeve 10 is positioned in the axial direction A of the bearing.

Next, the specific structure of the outer cover 20 and its assembly relationship with the inner sleeve 10 and the bearing will be described with reference to FIGS. 3 , 7 to 9 .

The outer cover 20 is in the shape of a cover with a groove in the middle, which includes an outer retaining ring 21 extending along the axial direction A at the outer peripheral portion, an inner retaining ring 23 extending along the axial direction A at the inner peripheral portion, and connecting the outer retaining ring 21 and The retaining ring 22 of the inner retaining ring 23 is perpendicular to the axial direction A. The retaining ring 22 is located at the axial ends of the outer retaining ring 21 and the inner retaining ring 23 .

The outer buckle 21 is used to fit the inner sleeve 10 with interference fit. The outer retaining ring 21 or the inner surface of the outer retaining ring 21 forms an outer cooperating portion 211 that is positively locked with the inner cooperating portion 111 . In this embodiment, the outer fitting portion 211 (or the inner surface of the outer retaining ring 21 ) is formed as a part of the tapered surface. In the axial direction A, the further toward the retaining ring 22, the larger the inner diameter of the outer fitting portion 211 is.

As shown in FIG. 3 , in the illustrated example, the above-mentioned outer matching portion 211 is formed by changing the thickness of the outer retaining ring 21 at different axial positions. For example, the outer matching portion 211 can be formed by punching or machining.

In addition, in other possible embodiments, without changing the shape of the outer matching portion 211 , the outer retaining ring 21 can also be set to have the same thickness at different axial positions, that is, the outer peripheral wall of the outer retaining ring 21 Parallel to the outer matching portion 211 , the outer retaining ring 21 is formed into a tapered shape as a whole. In this case, the conical outer retaining ring 21 can be formed, for example, by a deep drawing process.

Preferably, the axial length of the outer retaining ring 21 is equal to the axial length of the main body 11 , so that when the inner sleeve 10 and the outer cover 20 are assembled together, the end of the outer retaining ring 21 abuts against the end edge 12 , and the end of the main body 11 abuts against the end edge 12 . The ends abut against the stop ring 22, and the distance in the axial direction between the inner sleeve 10 and the outer cover 20 is limited to each other.

The above-mentioned structures of the inner fitting portion 111 and the outer fitting portion 211 enable the two to be nested with each other in a slightly elastically deformed manner, and they are not easily disengaged from each other after the fitting is completed.

It should be understood that the inner sleeve 10 and outer cover 20 are tightly fitted in the radial direction R when the assembly is completed. The gap in the radial direction R between the inner sleeve 10 and the outer cover 20 shown in Fig. 3 for clear illustration does not actually exist.

The inner retaining ring 23 is bent toward the inside of the bearing relative to the retaining ring 22 to further enhance the sealing effect of the sealing cover S.

Preferably, the outer cover 20 is not in contact with the inner ring B1 , the rolling bodies B3 or the retaining ring W. That is, in the present embodiment, the inner retaining ring 23 does not contact the rolling elements B3 in the axial direction A and does not contact the inner ring B1 in the radial direction R. As shown in FIG.

In this embodiment, the outer cover 20 may be made of steel, such as steel with a grade of DC03, which is formed by stamping, for example.

For the assembling method of the sealing cover S and the bearing, for example, the inner sleeve 10 and the outer cover 20 can be assembled together to form the sealing cover S, and then the sealing cover S can be sleeved on the outer ring B2, and the convex part 10a can be inserted into the groove B2a.

Due to the small elastic modulus of the inner sleeve 10, the tight fit between the inner sleeve 10 and the outer cover 20 and the tight fit between the inner sleeve 10 and the outer ring B2 are mainly reflected in the deformation of the inner sleeve 10, while the tight fit between the outer cover 20 and the outer ring B2 is mainly reflected in the deformation of the inner sleeve 10. The amount of deformation is small.

The solid line in FIG. 10 shows the radial deformation of the outer peripheral portion of the outer ring at different distances from the bearing center in the axial direction of the bearing to which the above-mentioned seal cover S is mounted. The test shows that for the outer cover 20 made of steel with a Young's modulus of 200Gpa and a grade of DC03 and an inner sleeve 10 made of glass fiber reinforced nylon with a Young's modulus of 2Gpa and a specification of PA66-GF25, the combination of The formed sealing cover S, after it is installed on the bearing, the deformation of the outer ring B2 is very small, which meets the design requirements.

Some beneficial effects of the above-mentioned embodiments of the present invention are briefly described below.

(i) Since the inner sleeve 10 is made of a material with a smaller elastic modulus, during the assembling process of the interference fit, the deformation mainly occurs in the inner sleeve 10 rather than the outer ring B2 or the outer cover 20, which is equivalent to the inner sleeve 10 first. Since the outer cover 20 and the outer ring B2 absorb the deformation, the deformation of the outer ring B2 before and after the sealing ring S is assembled is very small, so that the outer ring B2 equipped with the sealing ring S can meet the design requirements.

(ii) For example, after removing the seal cover S for bearing maintenance, since the deformation of the outer cover 20 is small, only the inner sleeve 10 can be replaced to reinstall the seal cover S without replacing the outer cover 20 . That is, the outer cover 20 can be reused, saving cost.

It should be understood that the above-mentioned embodiments are only exemplary, and are not intended to limit the present invention. Those skilled in the art can make various modifications and changes to the above-described embodiments under the teachings of the present invention without departing from the scope of the present invention. E.g:

(i) The inner fitting portion 111 and the outer fitting portion 211 do not have to be tapered, and they may also be other form-fitting shapes. or a concave portion formed in the radial direction.

(ii) The notches provided for material saving and weight reduction can also be provided in the outer matching portion 211. For example, there are multiple outer matching portions 211 and are arranged at intervals along the circumferential direction of the outer retaining ring 21. Adjacent outer matching portions A notch recessed radially outward is formed in the inner peripheral wall of the outer retaining ring 21 between 211 . These notches can not only be used to reduce weight, but also provide space for the deformation of the material of the inner sleeve 10 , so that assembly is easier and more secure after assembly.

In this case, in order to facilitate the assembly of the inner sleeve 10 and the outer cover 20, preferably, the inner fitting portion 111 is formed in a complete ring shape (ie, the outer peripheral wall of the main body 11 does not form a gap 112).

It should be understood that the gap may also exist in the inner sleeve 10 and the outer cover 20 at the same time. In this case, it should be ensured that the inner matching portion 111 and the outer matching portion 211 have at least partial contact and engagement regions in the circumferential direction.

(iii) It should be understood that the raised portion 10a does not have to form a complete annular shape, but may be, for example, a plurality of raised areas spaced apart in the circumferential direction.

(iv) The bearing of the bearing assembly according to the present invention does not have to be a double row cylindrical roller bearing, nor does it have to be a bearing for a bogie.

Claims

A sealing cover, which is used to be sleeved on the axial end of an outer ring (B2) of a bearing, wherein the sealing cover comprises an inner sleeve (10) and an outer cover (20), both of which are annular, the outer The cover (20) includes a retaining ring (22) for extending partially between the inner ring (B1) and the outer ring (B2) of the bearing in the radial direction (R) of the sealing cover, to Block foreign matter from entering the inside of the bearing,

The inner sleeve (10) is sleeved on the outer ring (B2), the outer cover (20) is sleeved on the outer circumference of the inner sleeve (10),

The elastic modulus of the inner sleeve (10) is smaller than the elastic modulus of the outer cover (20) and the outer ring (B2).
The sealing cap according to claim 1, wherein the inner sleeve (10) comprises a cylindrical main body (11), and an inner fitting portion (111) is formed on the outer periphery of the main body (11),

The outer cover (20) includes an outer retaining ring (21) located on the outer periphery and protruding from the retaining ring (22) in the axial direction (A) of the sealing cover, the outer retaining ring (21) ) is formed with an outer fitting portion (211) on the inner circumference,

The inner fitting portion (111) and the outer fitting portion (211) are form-fittingly fitted.
The sealing cover according to claim 2, characterized in that, in the axial direction (A), the further toward the retaining ring (22), the larger the outer diameter of the inner matching portion (111), so The larger the inner diameter of the outer fitting portion (211) is.
The sealing cover according to claim 3, characterized in that both the outer peripheral surface of the inner fitting portion (111) and the inner peripheral surface of the outer fitting portion (211) are tapered surfaces or a part of the tapered surfaces.
The sealing cover according to claim 2, characterized in that, the outer matching portion (211) is formed into a complete ring shape, there are multiple inner matching portions (111), and a plurality of the inner matching portions (111) Arranged along the circumferential direction of the main body (11), a notch (112) recessed radially inward on the outer peripheral wall of the main body (11) is formed between the adjacent inner fitting parts (111), or

The inner matching portion (111) is formed into a complete ring shape, there are multiple outer matching portions (211), and the plurality of outer matching portions (211) are arranged along the circumferential direction of the outer retaining ring (21), A notch recessed toward the radially outer side of the inner peripheral wall of the outer retaining ring (21) is formed between the adjacent outer matching portions (211).
The sealing cover according to claim 2, characterized in that, the inner sleeve (10) further comprises an annular end edge (12), the end edge (12) is located at the end of the main body (11), so The end along (12) extends outwardly beyond the inner fitting portion (111) in the radial direction (R),

The outer retaining ring (21) abuts against the end edge (12).
The sealing cover according to claim 1, characterized in that, a convex portion (10a) protruding radially inward is formed on the inner peripheral portion of the inner sleeve (10), and the convex portion (10a) is used to connect with The grooves located in the outer ring (B2) of the bearing are matched.
The sealing cover according to claim 7, characterized in that, in the axial direction (A) of the sealing cover, the convex portion (10a) is located at a distance of the inner sleeve (10) away from the retaining ring (22). ) end.
The sealing cover according to claim 1, characterized in that, the outer cover (20) further comprises an inner retaining ring (23) located at the inner peripheral portion thereof, and the inner retaining ring (23) is located on the inner surface of the sealing cover. Axial (A) extends beyond the retaining ring (22) and serves to extend toward the inside of the bearing.
The sealing cover according to any one of claims 1 to 9, characterized in that, the material for making the inner sleeve (10) comprises plastic.
The sealing cover according to any one of claims 1 to 9, characterized in that, the manufacturing material of the outer cover (20) comprises steel.
A bearing assembly comprising a bearing and a sealing cover according to any one of claims 1 to 11,

The bearing includes an inner ring (B1), an outer ring (B2) and rolling bodies (B3), and the sealing cover is mounted on the end of the outer ring (B2).
The bearing assembly according to claim 12, wherein the sealing cover is not in contact with the inner ring (B1) and the rolling elements (B3).
The bearing assembly according to claim 12, wherein the outer circumference of the outer ring (B2) is partially recessed radially inward to form an annular groove (B2a), and the inner sleeve (10) is partially extended into the groove (B2a) to be positioned in the axial direction of the bearing.
The bearing assembly of any one of claims 12 to 14, wherein the bearing is a cylindrical roller bearing.