Bearing assembly and bearing assembly assembly method

Abstract

A bearing assembly and a method for assembling the bearing assembly. The bearing assembly comprises an inner ring (1), an outer ring (2) and a pressure plate (3), the outer ring (2) being mounted on the radial outer side of the inner ring (1), and the pressure plate (3) being mounted on the radial outer side of the outer ring (2), the outer ring (2) having a first end (21) and a second end (22) opposite to each other in the axial direction, and having an annular mounting groove (23) formed on the radial outer side of the first end (21), the pressure plate (3) having a mounting hole (31) and a protrusion (32) extending from the inner periphery of the mounting hole (31) toward the radial inner side, when the pressure plate (3) is mounted on the outer ring (2), the protrusion (32) is radially inserted into the mounting groove (23), so that the pressure plate (3) is rotatably positioned axially relative to the outer ring (2), the mounting hole (31) is an elliptical or quasi-elliptical shape having a major axis and a minor axis, and the pressure plate (3) has two protrusions (32), and the two protrusions (32) are respectively located at the two end points of the minor axis of the mounting hole (31). The bearing assembly and assembly method described above are easy to assemble.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a bearing assembly and a method for assembling the bearing assembly. Background Art

[0002] Deep groove ball bearings with a pressure plate are commonly used in gearboxes. The pressure plate's function is to mount the deep groove ball bearing to the gearbox housing. The pressure plate is press-fitted to the outer ring of the bearing. Once in place, the pressure plate is locked to the outer ring with a loose fit and can rotate freely circumferentially relative to the outer ring.

[0003] Common assembly methods are currently described in patent documents such as CN 106460938 B. In this method, a circular mounting hole is formed on the pressure plate, and three raised portions are evenly distributed along the circumference of the inner periphery of the mounting hole. When assembling the pressure plate onto the outer ring, the raised portions are pressed one by one into the annular mounting grooves of the outer ring. The sliding engagement of the raised portions with the mounting grooves achieves rotatable axial positioning.

[0004] The drawback of this installation method is that the raised portions of the pressure plate deform when pressed into the mounting grooves. The last raised portion to be pressed in experiences particularly severe deformation, which can cause the raised portion to break, potentially leading to various problems. First, the fractured surface of the raised portion can produce debris that can contaminate the bearing. Furthermore, because radial positioning between the pressure plate and the outer ring requires at least three raised portions, if some of the raised portions are missing, the relative position between the pressure plate and the outer ring deviates, causing the pressure plate to become stuck in the outer ring. In this case, the pressure plate can easily detach from the outer ring and fall off. Finally, due to issues such as elliptical deformation of the outer ring after heat treatment, even if the raised portions are uniform in size after press-fitting, some points may lack sufficient restraint, leading to the pressure plate falling off. Therefore, this structure also places very high demands on heat treatment stability. To reduce the breakage rate, the current method is to lathe the stepped surface after heat treatment to ensure alignment with the inner diameter of the pressure plate, significantly increasing processing costs.

[0005] Another existing assembly method uses a snap ring to secure the outer ring and pressure plate together. This assembly method is described, for example, in patent documents such as CN 203570992 U. A circumferentially extending annular groove is provided inside the mounting hole of the pressure plate to accommodate the snap ring. The snap ring is elastically deformable, allowing it to snap into the groove and return to its original size after installation, thereby connecting the pressure plate and outer ring. However, due to the snap ring's tendency to elastically deform, it may fall off during use, causing the pressure plate to detach from the outer ring. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to provide a bearing assembly that is easy to assemble and an assembling method of the bearing assembly.

[0007] The above technical problems are solved by a bearing assembly according to the present invention. The bearing assembly comprises an inner ring, an outer ring, and a pressure plate. The outer ring is mounted radially outward of the inner ring, and the pressure plate is mounted radially outward of the outer ring. The outer ring has axially opposing first and second ends and an annular mounting groove formed radially outward of the first end. The pressure plate has a mounting hole and a protrusion extending radially inward from the inner circumference of the mounting hole. When the pressure plate is mounted on the outer ring, the protrusion radially inserts into the mounting groove, rotatably positioning the pressure plate axially relative to the outer ring. Specifically, when viewed in a cross-section perpendicular to the central axis of the bearing assembly, the mounting hole is elliptical or quasi-elliptical, such as an oval or leaf shape, with a major axis and a minor axis. The pressure plate has two protrusions, one located at each end of the minor axis of the mounting hole. When the outer ring is mounted in the mounting hole of the pressure plate, an external force can be applied to the outer ring, causing the outer ring's cross-section to become flatter, particularly reducing the radius between two radially opposing force application points. In this case, the outer ring has an elliptical or nearly elliptical cross-section, with the shorter radius forming the minor axis of the ellipse. During installation, since the outer ring's outer diameter shortens in one direction during elastic deformation, the protrusion installed radially outward from the outer ring in this direction experiences minimal deformation, and can even avoid deformation without contacting the outer ring. After the mounting plate and outer ring are positioned relative to each other, simply remove the applied external force, and the outer ring returns to its original shape, allowing the two protrusions to fully radially insert into the mounting grooves, thereby positioning them axially relative to each other. This bearing assembly not only facilitates installation but also reduces the external forces exerted on the protrusions during assembly, thereby reducing the risk of fracture and failure.

[0008] According to a preferred embodiment of the present invention, the cross-section of the first end can be circular in the unstressed and deformed state, and the minor axis length of the mounting hole can be greater than the outer diameter of the first end in the unstressed and deformed state. Therefore, in the installed state, only the two protrusions on the pressure plate are inserted into the mounting grooves of the outer ring, and the pressure plate and outer ring can freely rotate relative to each other.

[0009] According to another preferred embodiment of the present invention, the cross-section of the first end can elastically deform into an elliptical shape with a major axis and a minor axis when subjected to force and deformation, corresponding to the shape of the mounting hole. The distance between the apexes of the two raised portions on the pressure plate can be smaller than the outer diameter of the first end in the undeformed state, and larger than the minor axis length of the first end in the deformed state. Therefore, when the outer ring is subjected to force and deformation, the pressure plate, and particularly its raised portions, can be installed into the mounting hole without contacting the outer ring. After the external force is removed, the two raised portions of the pressure plate can simultaneously radially insert into the mounting groove of the elastically restored outer ring, thereby axially positioning the pressure plate and outer ring relative to each other. During the entire installation process, the raised portions on the pressure plate are not subjected to external force and deformation, thereby reducing the risk of breakage and damage.

[0010] According to another alternative embodiment of the present invention, the major axis length of the mounting hole can be greater than the major axis length of the first end in the deformed state. Therefore, when the outer ring is deformed, the major axis of the first end in its cross section will not interfere with the mounting hole, allowing the first end of the outer ring to be easily inserted into the mounting hole of the pressure plate.

[0011] According to another preferred embodiment of the present invention, the outer ring may have a shoulder near the first end, with the shoulder having a radial surface facing the first end. When the pressure plate is mounted on the outer ring, the pressure plate can axially abut the radial surface of the shoulder. When the first end of the outer ring is axially inserted into the mounting hole of the pressure plate, the shoulder can serve as an axial stop and position the pressure plate. In this case, the outer circumferential cross-section of the shoulder also elastically deforms into an elliptical shape with a major axis and a minor axis when subjected to stress and deformation. To facilitate positioning of the pressure plate, the minor axis of the mounting hole is shorter than the minor axis length of the outer circumferential cross-section of the shoulder in the stressed and deformed state.

[0012] According to another preferred embodiment of the present invention, the mounting groove can abut the radial surface of the shaft shoulder, and correspondingly, the protrusion can abut the end surface of the pressure plate facing the shaft shoulder. This allows the undercut formed during the machining of the shaft shoulder to be directly utilized as the mounting groove, thereby saving machining steps and reducing production costs.

[0013] According to another preferred embodiment of the present invention, the raised portion can have an arcuate profile when viewed in a cross-section through the central axis of the bearing assembly. Accordingly, the mounting groove can have a profile complementary to the raised portion. Because the raised portion easily fits into the mounting groove during installation and is less susceptible to deformation and fracture, the raised portion does not need to have the hemispherical profile used in the prior art. The arcuate raised portion and the mounting groove combine to ensure smoother relative rotation between the pressure plate and outer ring after installation.

[0014] The above-mentioned technical problem is also addressed by a bearing assembly assembly method according to the present invention. This assembly method is used to assemble a bearing assembly having the above-mentioned features. The method comprises: applying an external force to the outer ring to elastically deform the outer ring, thereby imparting an elliptical cross-section; axially inserting the deformed outer ring into the mounting hole, with the minor axis of the first end of the deformed outer ring circumferentially aligned with the minor axis of the mounting hole, such that the protrusion is axially aligned with the mounting groove; and removing the external force applied to the outer ring, allowing the outer ring to elastically recover and the protrusion to radially insert into the mounting groove. During installation of the outer ring into the mounting hole using this method, the protrusion undergoes minimal or no deformation, thereby improving installation convenience and reducing the risk of fracture and failure of the protrusion.

[0015] According to a preferred embodiment of the present invention, the bearing assembly may further include rolling elements mounted between the inner and outer rings. The rolling elements can be installed between the inner and outer rings simultaneously with the deformed outer ring being installed in the mounting hole. This allows the rolling element installation and the outer ring and pressure plate assembly to be completed simultaneously, thereby reducing the number of machining steps and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below with reference to the accompanying drawings. Elements with the same function are represented by the same reference numerals in the drawings. Among them:

[0017] Figure 1 A front view showing a bearing assembly according to an embodiment of the present invention;

[0018] Figure 2 A cross-sectional view showing a bearing assembly according to an embodiment of the present invention;

[0019] Figure 3 A front view showing a pressure plate of a bearing assembly according to an embodiment of the present invention;

[0020] Figure 4a and Figure 4b Partial perspective views of a pressure plate of a bearing assembly according to an embodiment of the present invention are respectively shown;

[0021] Figure 5a and Figure 5b A partial side view and a partial perspective view respectively show an outer ring of a bearing assembly according to an embodiment of the present invention;

[0022] Figures 6a to 6d The assembly processes of the bearing assembly according to the embodiment of the present invention are respectively shown. DETAILED DESCRIPTION

[0023] The following description of the specific embodiments of the bearing assembly and assembly method according to the present invention will be described in conjunction with the accompanying drawings. The following detailed description and accompanying drawings are used to illustrate the principles of the present invention. The present invention is not limited to the preferred embodiments described. The scope of protection of the present invention is defined by the claims.

[0024] According to an embodiment of the present invention, a bearing assembly is provided. Such a bearing assembly can be used in a gearbox of a motor vehicle, for example. Figures 1 to 6d A preferred embodiment of a bearing assembly according to the present invention is shown. In this embodiment, the bearing assembly is schematically shown as a deep groove ball bearing, but this is not restrictive. The technical solution of the present invention is also applicable to various other types of bearings, such as tapered roller bearings or needle roller bearings.

[0025] Figure 1 and Figure 2 1 and 2 show a front view and a cross-sectional view of a bearing assembly according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the bearing assembly includes an inner ring 1, an outer ring 2, a pressure plate 3, multiple rolling elements 4, and end caps 5. These components are typically made of metal or other materials. The inner ring 1, outer ring 2, and pressure plate 3 are all annular components and are coaxially arranged. The outer ring 2 is mounted radially outward from and surrounds the inner ring 1. Multiple spherical rolling elements 4 are radially mounted between the inner ring 1 and the outer ring 2 and are evenly spaced circumferentially. The rolling elements 4 can roll circumferentially along the raceways on the opposing side surfaces of the inner ring 1 and the outer ring 2, allowing relative rotation between the inner ring 1 and the outer ring 2. Two end caps 5 are mounted between the inner ring 1 and the outer ring 2 on either side of the rolling elements 4 in the axial direction, thereby enclosing the rolling elements 4 within the bearing assembly.

[0026] like Figure 2 As shown, the outer ring 2 has an axially opposed first end 21 and a second end 22. A pressure plate 3 is mounted radially outward of the first end 21 of the outer ring 2. The pressure plate 3 is a flat plate-shaped component extending generally in a plane perpendicular to the central axis of the bearing assembly. A mounting hole 31 is formed in the center of the pressure plate 3, into which the first end 21 of the outer ring 2 is axially inserted. Figure 3 Shown is a front view of the pressing plate 3. Figure 3 As shown, unlike the circular mounting holes on the pressure plate in conventional technology, the mounting hole 31 on the pressure plate 3 according to the present invention is relatively flat in one direction and relatively elongated in another direction, thus forming an elliptical shape. For a circular mounting hole, the inner diameter in any radial direction passing through the center point is a constant value; however, for the elliptical mounting hole 31 according to the present invention, the inner diameter length in different radial directions is different, among which the longest inner diameter is Figure 3The long axis x of the mounting hole shown in the figure is , and the shortest inner diameter is Figure 3 The minor axis y of the mounting hole is shown in FIG. The major axis x and the minor axis y of the mounting hole may extend substantially orthogonally in a plane perpendicular to the central axis of the bearing assembly.

[0027] It should be noted that, particularly with respect to the mounting hole 31, the ellipse here is not necessarily an ellipse in the strict sense of analytical geometry, but can be an ellipse in a broad sense, that is, various oblate shapes with a major axis and a minor axis. In addition, ellipse-like shapes such as an oval (the curvature of the circumference at both ends of the major axis is unequal) and a leaf shape (the circumference at both ends of the major axis may have sharp or concave points) are also feasible.

[0028] like Figure 3 As shown, the pressing plate 3 has two protrusions 32 formed on the inner side of the mounting hole 31 . The two protrusions 32 are respectively located at two end points of the short axis y of the elliptical mounting hole 31 . Figure 4a and Figure 4b The partial stereograms of the pressing plate 3 at the two raised portions 32 are shown respectively. Figure 4a and Figure 4b As shown, the two protrusions 32 have substantially the same shape. Each protrusion 32 extends from the inner periphery of the mounting hole 31 toward the radial inside.

[0029] Figure 5a and Figure 5b The partial side view and the partial stereogram of the outer ring 2 are shown respectively. Figure 5a and Figure 5b As shown, an annular mounting groove 23 is formed on the radial outer side of the first end 21 of the outer ring 2. The mounting groove 23 extends circumferentially along the outer surface of the first end 21 and is recessed in the radial direction. Figure 2 When the outer ring 2 and the pressure plate 3 are installed together, the two protrusions 32 on the pressure plate 3 are radially inserted into the mounting grooves 23 on the outer ring 2 from opposite radial sides, thereby positioning the two relative to each other in the axial direction and allowing the two to rotate relative to each other around the central axis of the bearing assembly.

[0030] like Figure 5a and Figure 5b As shown, in order to facilitate the axial positioning of the pressure plate 3 during installation, a shoulder 24 may be preferably formed on the outer ring 2 near the first end 21. The shoulder 24 has a radial surface that extends generally in the radial direction and faces the first end 21. The presence of the shoulder 24 makes the outer diameter of the outer ring 2 at the first end 21 smaller than the outer diameter at the other side of the shoulder 24 (the portion near the second end 22). Figure 2As shown in the figure, when installed, the pressure plate 3 can axially abut the radial surface of the shoulder 24. The shoulder 24 helps to axially position the pressure plate 3 relative to the outer ring 2 during installation. Preferably, the installation groove 23 can abut the radial surface of the shoulder 24, so that the installation groove 23 can be directly formed by utilizing the undercut generated when machining the shoulder 24, thereby reducing the number of machining steps. In this case, as Figure 4a and Figure 4b As shown, the two protrusions 32 of the pressure plate 3 also approximately abut the end surface of the pressure plate 3 facing the shaft shoulder 24. In addition, preferably, when viewed in a cross section passing through the central axis of the bearing assembly, the protrusion 32 and the mounting groove 23 can have complementary arcuate profiles, that is, the protrusion 32 has a convex arcuate profile, and the mounting groove 23 has a concave arcuate profile.

[0031] Refer again Figure 1 When installed, neither the outer ring 2 nor the pressure plate 3 is deformed by stress, thus maintaining their original design. The outer contour of the outer ring 2 is circular with a uniform outer diameter. Specifically, the first end 21 of the outer ring 2 has a circular cross-section. The mounting hole 31 of the pressure plate 3 is elliptical. The distance between the apexes of the two protrusions 32 is less than the outer diameter of the first end 21 and slightly greater than the outer diameter of the mounting groove 23 at its base. Therefore, the protrusions 32 at both ends of the minor axis of the mounting hole 31 radially penetrate into the mounting groove 23 of the first end 21. The minor axis of the mounting hole 31 is slightly longer than the outer diameter of the first end 21, but shorter than the outer diameter of the outer circumferential cross-section of the shoulder 24. Because the major axis of the mounting hole 31 is longer than the minor axis, the first end 21 does not interfere with the mounting hole 31 throughout its circumference, allowing free relative rotation between the outer ring 2 and the pressure plate 3. At the same time, since the two protrusions 32 are formed at both ends of the short axis of the mounting hole 31, the diameter of the mounting hole 31 measured in the direction parallel to the short axis reaches its maximum value only at the position of the short axis, which makes it impossible for the outer ring 2 to move toward both sides along the long axis direction in the mounting hole 31, so that it always remains aligned with the mounting hole 31, and therefore the two protrusions 32 will not fall out of the mounting groove 23.

[0032] Figures 6a to 6d The assembly process of the bearing assembly is shown in FIG. Figure 6bAs shown, when assembling the outer ring 2 and the pressure plate 3, simply applying a certain external force, particularly radial force, to the outer ring 2 causes elastic deformation. At this point, the cross-section of the outer ring 2, particularly the first end 21, changes from a circular shape with a uniform outer diameter in the unstressed state to an elliptical shape with a major and minor axis in the stressed state. Because the minor axis of the first end 21 is smaller than its unstressed outer diameter, the two protrusions 32 of the pressure plate 3 can be effortlessly engaged into the mounting grooves 23 from the two endpoints of the minor axis of the first end 21. Furthermore, because the major axis of the first end 21 is longer than its unstressed outer diameter, to prevent interference, the major axis of the mounting hole 31 is preferably longer than the major axis of the first end 21 in the stressed state.

[0033] like Figure 6b and Figure 6c As shown, preferably, the distance between the vertices of the two protrusions 32 of the pressure plate 3 can be calculated to be greater than the short axis length of the elliptical cross-section of the first end 21 that is deformed by force, so that the first end 21 can be fully inserted into the mounting hole 31 without the first end 21 contacting the two protrusions 32. Therefore, in the above process, the protrusions 32 will not be subjected to external forces and will not be deformed. This greatly reduces the risk of the protrusions 32 breaking and failing during the assembly process. At the same time, the outer cross-section of the shoulder 24 will also become an ellipse with a major axis and a minor axis when it is deformed by force. In order to help the outer ring 2 and the pressure plate 3 to be axially positioned during this process, it is preferred that the short axis length of the mounting hole 31 is smaller than the short axis length of the outer cross-section of the shoulder 24 when it is deformed by force. Therefore, as Figure 6c As shown, when the first end 21 of the deformed outer ring 2 is inserted into the mounting hole 31 , the pressure plate 3 will abut against the radial surface of the shaft shoulder 24 in the axial direction without going over the shaft shoulder 24 .

[0034] Corresponding to the bearing assembly in the above embodiment, another embodiment of the present invention further provides a bearing assembly assembly method for assembling the bearing assembly according to the above embodiment. The advantages of the bearing assembly according to the present invention in the assembly process are further demonstrated in the assembly method according to this embodiment.

[0035] Also refer to Figures 6a to 6d To explain the various steps of the assembly method according to this embodiment. Figure 6a In the figure, the outer ring 2 and the pressure plate 3 are both in their original, unforced state. At this point, the outer ring 2 has a circular cross-section. Because the distance between the vertices of the two protrusions 32 is smaller than the outer diameter of the first end 21, the first end 21 is difficult to insert into the mounting hole 31.

[0036] exist Figure 6bThe first step of the assembly method is to apply external force to the outer ring 2, especially in the radial direction, so that the outer ring 2 undergoes elastic deformation and thus has an elliptical cross section. Figure 6b As shown, in this state, the outer diameter of the first end 21 becomes smaller at the short axis position.

[0037] exist Figure 6c The second step of the assembly method is performed. With the minor axis of the deformed first end 21 of the outer ring 2 roughly aligned circumferentially with the minor axis of the mounting hole 31, the first end 21 of the deformed outer ring 2 is axially inserted into the mounting hole 31 of the pressure plate 3, so that the two protrusions 32 of the pressure plate 3 are roughly aligned axially with the mounting groove 23 of the outer ring 2. As previously mentioned, during this process, the pressure plate 3 can preferably be axially abutted against the radial surface of the shaft shoulder 24, thereby facilitating axial alignment using the shaft shoulder 24. Throughout this second step, external force must be continuously applied to the outer ring 2 to maintain its elastic deformation.

[0038] exist Figure 6d The third step of the assembly method is performed. The external force applied to the outer ring 2 is removed, allowing it to elastically recover. The two protrusions 32 of the pressure plate 3 are radially inserted into the mounting grooves 23 of the outer ring 2. At this point, the outer ring 2 and pressure plate 3 are assembled together, allowing for relative rotation. Throughout this assembly process, the pressure plate 3, and in particular the two protrusions 32, remain largely unaffected by stress or only minimally deformed. This effectively reduces the risk of fracture and failure of the pressure plate 3, and in particular the two protrusions 32.

[0039] Preferably, to save process steps, in the second step of the above-described assembly method, while the deformed outer ring 2 is being installed in the mounting hole 31 of the pressure plate 3, the rolling elements 4 are simultaneously installed between the outer ring 2 and the inner ring 1. At this point, because the inner cross-section of the outer ring 2 in its deformed state is still elliptical, while the outer cross-section of the undeformed inner ring 1 is circular, the distance between the outer ring 2 and the inner ring 1 at both ends of the major axis of its inner cross-section increases. In this case, the rolling elements 4 can be conveniently installed between the inner ring 1 and the outer ring 2 from both ends of the major axis of the inner cross-section of the outer ring 2. In current mechanized bearing assembly processes, this assembly method allows both pressure plate installation and rolling element installation to be completed in a single step, significantly simplifying the production process and improving production efficiency.

[0040] While the foregoing descriptions illustrate possible embodiments, it should be understood that numerous variations exist through combinations of all known and other technical features and implementations readily conceivable to a skilled artisan. Furthermore, it should be understood that the exemplary embodiments serve merely as examples and in no way limit the scope, application, or configuration of the present invention. The foregoing descriptions are intended primarily to provide a skilled artisan with technical guidance for implementing at least one exemplary embodiment. Various modifications, particularly regarding the functionality and structure of the components described, may be made without departing from the scope of the claims.

[0041] Reference Signs

[0042] 1 inner ring

[0043] 2 outer ring

[0044] 21 First End

[0045] 22 Second End

[0046] 23 mounting slots

[0047] 24 shoulder

[0048] 3 pressure plates

[0049] 31 mounting holes

[0050] 32 raised part

[0051] 4 rolling elements

[0052] 5 end caps

[0053] x Long axis of the mounting hole

[0054] Short axis of y mounting hole

Claims

1. A bearing assembly, comprising an inner ring (1), an outer ring (2) and a pressure plate (3), wherein the outer ring (2) is mounted on the radially outer side of the inner ring (1), and the pressure plate (3) is mounted on the radially outer side of the outer ring (2), the outer ring (2) has a first end (21) and a second end (22) opposite to each other in the axial direction, and has an annular mounting groove (23) formed on the radially outer side of the first end (21), the pressure plate (3) has a mounting hole (31) and a protrusion (32) extending radially inward from the inner periphery of the mounting hole (31), when the pressure plate (3) is mounted on the outer ring (2), the protrusion (32) is radially inserted into the mounting groove (23), so that the pressure plate (3) is rotatably positioned axially relative to the outer ring (2), It is characterized in that The mounting hole (31) is an ellipse or quasi-ellipse with a major axis and a minor axis, the pressure plate (3) has two protrusions (32), and the two protrusions (32) are respectively located at the two end points of the minor axis of the mounting hole (31), the cross section of the first end (21) elastically deforms into an ellipse with a major axis and a minor axis under a force-deformed state, and the distance between the vertices of the two protrusions (32) is greater than the minor axis length of the first end (21) under a force-deformed state.

2. The bearing assembly according to claim 1, wherein: The cross section of the first end (21) is circular in a state of no force deformation, and the minor axis length of the mounting hole (31) is greater than the outer diameter of the first end (21) in the state of no force deformation.

3. The bearing assembly according to claim 2, wherein: The distance between the vertices of the two protrusions (32) is smaller than the outer diameter of the first end (21) in a non-stressed and deformed state.

4. The bearing assembly according to claim 3, wherein: The long axis length of the mounting hole (31) is greater than the long axis length of the first end (21) in a stressed and deformed state.

5. The bearing assembly according to claim 1, wherein: The outer ring (2) has a shoulder (24) close to the first end (21), and the shoulder (24) has a radial surface facing the first end (21). When the pressure plate (3) is installed on the outer ring (2), the pressure plate (3) can axially abut the radial surface of the shoulder (24).

6. The bearing assembly according to claim 5, wherein: The outer peripheral cross section of the shaft shoulder (24) is elastically deformed into an ellipse with a major axis and a minor axis in a stress-deformed state, and the minor axis length of the mounting hole (31) is smaller than the minor axis length of the outer peripheral cross section of the shaft shoulder (24) in the stress-deformed state.

7. The bearing assembly according to claim 5, wherein: The mounting groove (23) is adjacent to the radial surface of the shaft shoulder (24), and the protrusion (32) is adjacent to the end surface of the pressure plate (3) facing the shaft shoulder (24).

8. The bearing assembly according to any one of claims 1 to 7, characterized in that When viewed in a cross section passing through the central axis of the bearing assembly, the protrusion (32) has an arcuate profile, and the mounting groove (23) has a profile complementary to that of the protrusion (32).

9. A method for assembling a bearing assembly, for assembling a bearing assembly according to any one of claims 1 to 8, characterized in that: The assembly method comprises: Applying an external force to the outer ring (2) causes the outer ring (2) to undergo elastic deformation, thereby having an elliptical cross section; When the short axis of the first end (21) of the deformed outer ring (2) is aligned circumferentially with the short axis of the mounting hole (31), the deformed outer ring (2) is inserted axially into the mounting hole (31) so that the protrusion (32) is aligned axially with the mounting groove (23); The external force applied to the outer ring (2) is removed, so that the outer ring (2) elastically recovers, and the protrusion (32) is radially inserted into the installation groove (23).

10. The assembly method according to claim 9, characterized in that: The bearing assembly further comprises a rolling element (4) mounted between the inner ring (1) and the outer ring (2), and the rolling element (4) is loaded between the inner ring (1) and the outer ring (2) while the deformed outer ring (2) is mounted in the mounting hole (31).

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