Miniature needle bearing for automobile

Abstract

The utility model discloses a miniature needle bearing for an automobile, which belongs to needle bearings and comprises a bearing outer ring and a rolling body component. The inner circle surface of the bearing outer ring forms a raceway for rotatably mounting the rolling body assembly, the inner circle of the bearing outer ring is sunken at two ends of the raceway to form mounting grooves, check rings are correspondingly clamped in the mounting grooves, and the two check rings limit the axial movement of the rolling body assembly. The bearing outer ring and the check rings are of a combined structure, the check rings are clamped into the mounting grooves in the two ends of the bearing outer ring and are clamped with the bearing outer ring to form an integrated structure, and the needle bearing with the check rings is formed; the retainer ring and the bearing outer ring are respectively processed, so that the processing difficulty of the raceway of the bearing outer ring is reduced, and the processing material of the bearing outer ring is saved.

Description

Technical Field

[0001] The utility model relates to a needle roller bearing, in particular to a miniature needle roller bearing used for automobiles. Background Art

[0002] As my country's automotive industry transitions to new energy vehicles, the domestic automotive manufacturing industry is placing increasingly stringent requirements on the cost and geometry of automotive bearings. Traditional needle roller bearings consist of an outer ring, cage, rolling elements, and an inner ring. To simplify the structure, the inner ring can be replaced by a drive shaft. To limit axial displacement of the rolling elements and prevent them from slipping out of the outer ring raceway, the outer ring of needle roller bearings typically features a double-ribbed or at least single-ribbed design. The raceway is recessed within the inner surface of the outer ring, and retaining rings on either side of the outer ring restrain the rolling elements, preventing them from slipping out of the outer ring. However, this design often results in increased outer ring material consumption and higher costs. This is particularly true for small and miniature needle roller bearings, where the recessed raceway further complicates outer ring manufacturing, hindering efficiency and precision. Utility Model Content

[0003] Technical problem solved: In response to the problems existing in the prior art, the utility model provides a miniature needle roller bearing for automobiles, which can reduce the processing difficulty of the bearing outer ring raceway and improve the processing accuracy of the bearing outer ring raceway, while saving the processing material of the bearing outer ring and reducing the processing cost of the needle roller bearing outer ring.

[0004] Technical solution: The utility model relates to a miniature needle roller bearing for automobiles, wherein the needle roller bearing comprises a bearing outer ring and a rolling element assembly;

[0005] The inner circular surface of the outer ring of the bearing forms a raceway for the rotational installation of the rolling element assembly, and the inner circle of the outer ring of the bearing is sunken at both ends of the raceway to form an installation groove, and a retaining ring is correspondingly clamped in the installation groove. The two retaining rings limit the axial movement of the rolling element assembly.

[0006] Preferably, the rolling element assembly comprises a retaining frame, and the retaining frame has a plurality of limiting grooves evenly distributed along its circumference, and a rolling element is rotatably mounted in each limiting groove.

[0007] Preferably, the mounting groove adopts a trapezoidal structure with a small diameter at the mouth and a large diameter at the bottom.

[0008] Preferably, the angle R1 between the tangent line of the installation groove opening and the end face of the bearing outer ring is 80°.

[0009] Preferably, guide grooves are provided on both side end surfaces of the bearing outer ring outside the groove opening of the mounting groove.

[0010] Preferably, the guide groove adopts a trapezoidal structure with a large diameter at the mouth and a small diameter at the bottom.

[0011] Preferably, the angle R2 between the tangent line of the guide groove and the cross section of the bearing outer ring is 45°.

[0012] Preferably, the retaining ring is formed by stamping a steel plate into a butterfly-shaped structure with a recessed middle portion, and the retaining ring is press-fitted into the mounting groove and unfolded to become a flat retaining ring.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] 1. The bearing outer ring and retaining ring of the utility model adopt a combined structure. The retaining ring is inserted into the installation grooves at both ends of the bearing outer ring and is clamped together with the bearing outer ring to form a one-piece structure, forming a needle roller bearing with retaining ring. The retaining ring and the bearing outer ring are processed separately, which reduces the difficulty of machining the raceway of the bearing outer ring and saves processing materials for the bearing outer ring.

[0015] 2. The retaining ring is formed by stamping, which improves the processing efficiency of the retaining ring and saves processing materials. The retaining ring is processed into a butterfly-shaped structure with a slightly concave middle before installation, which can make the retaining ring flat after press installation, preventing the retaining ring from sinking into the inner part of the bearing outer ring during installation and blocking the rolling elements inside the bearing, thereby avoiding affecting the rotation flexibility of the bearing.

[0016] 3. The mounting groove adopts a trapezoidal structure with a small diameter at the mouth and a large diameter at the bottom, which allows the retaining ring to be tightly inserted into the mounting groove without loosening or falling off. The included angle R1 of the mounting groove is 80°. If the angle of the mounting groove is too large, the retaining ring will be easy to loosen inside and will not be easy to clamp tightly. If the angle of the mounting groove is too small, there will be insufficient internal space, making it difficult for the retaining ring to be inserted into the mounting groove and difficult to unfold flat.

[0017] 4. The guide groove of the installation notch can guide the installation of the retaining ring, and at the same time prevent the retaining ring and the installation groove from scraping each other, causing iron filings to get stuck in the installation groove and affect the assembly effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of the axial structure of the WeChat needle roller bearing of the present invention.

[0019] Figure numerals: 100, needle roller bearing; 1, bearing outer ring; 11, mounting groove; 12, guide groove; 13, raceway; 2, retaining ring; 3, rolling element assembly; 4, retaining frame; 41, limiting groove; 5, rolling element. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following Figure 1The technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0021] Example: Figure 1 As shown, the utility model discloses a miniature needle roller bearing for automobiles. The needle roller bearing 100 includes a bearing outer ring 1 and a rolling element assembly 3. The inner circumference of the bearing outer ring 1 forms a raceway 13 for the rotatable installation of the rolling element assembly 3. The inner circumference of the bearing outer ring 1 is located at both ends of the raceway 13 and is recessed to form mounting grooves 11. The mounting grooves 11 are correspondingly mounted with retaining rings 2. The two retaining rings 2 limit the axial movement of the rolling element assembly 3. The bearing outer ring 1 and retaining ring 2 adopt a combined structure. The retaining rings are snapped into the mounting grooves 11 at both ends of the bearing outer ring 1 and are snapped together with the bearing outer ring 1 to form a one-piece structure, forming a needle roller bearing with retaining rings. The retaining rings and the bearing outer ring are processed separately, which reduces the difficulty of machining the bearing outer ring raceway and saves processing materials for the bearing outer ring.

[0022] In a preferred embodiment, if Figure 1 As shown, the retaining ring 2 is formed by stamping steel plate into a butterfly-shaped structure with a concave center. When the retaining ring 2 is press-fitted into the mounting groove 11, it unfolds into a flat retaining ring. The retaining ring 2 is formed by stamping, which improves the processing efficiency of the retaining ring and saves processing materials. The retaining ring 2 is processed into a butterfly-shaped structure with a slightly concave center before installation, so that the retaining ring can unfold flat after press-fitting, preventing the retaining ring from sinking into the inner part of the bearing outer ring during installation and blocking the rolling elements inside the bearing, thereby avoiding affecting the rotational flexibility of the bearing.

[0023] In a preferred embodiment, if Figure 1 As shown, the rolling element assembly 3 includes a retainer 4, which has a plurality of limiting grooves 41 evenly distributed along its circumference. A rolling element 5 is rotatably mounted in each limiting groove 41. The retainer 4 is correspondingly installed in the raceway 13 on the inner periphery of the bearing outer ring 1, so that the inner periphery of the rolling element 5 is correspondingly rotatably supported on the outer periphery of the transmission shaft, so that the transmission shaft replaces the inner ring of the traditional structure, thereby simplifying the structure of the needle roller bearing.

[0024] In a preferred embodiment, if Figure 1As shown, the mounting groove 11 adopts a trapezoidal structure with a small opening diameter and a large bottom diameter. The angle R1 between the tangent line of the mounting groove 11 and the end face of the bearing outer ring 1 is 80°. This trapezoidal structure with a small opening diameter and a large bottom diameter allows the retaining ring 2 to fit tightly into the mounting groove 11 without loosening or falling out. If the angle R1 of the mounting groove 11 is too large, the retaining ring 2 will easily loosen inside and will not be easily locked. If the angle R1 of the mounting groove 11 is too small, the internal space will be insufficient, making it difficult for the retaining ring 2 to fit into the mounting groove 11 and difficult to unfold and level.

[0025] In a preferred embodiment, if Figure 1 As shown, guide grooves 12 are provided on both end surfaces of the bearing outer ring 1, outside the opening of the mounting groove 11. Guide grooves 12 are trapezoidal in shape, with a large opening diameter and a small bottom diameter. The angle R2 between the tangent of the guide groove 12 and the cross-section of the bearing outer ring 1 is 45°. The guide grooves 12 at the opening of the mounting groove 11 guide the installation of the retaining ring 2 and prevent scraping between the retaining ring 2 and the mounting groove 11, which could cause iron filings to become lodged in the mounting groove 11 and affect assembly.

[0026] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A miniature needle roller bearing for automobiles, characterized in that: The needle roller bearing (100) comprises a bearing outer ring (1) and a rolling element assembly (3); The inner circumference of the bearing outer ring (1) forms a raceway (13) for the rolling element assembly (3) to be rotatably mounted, and the inner circumference of the bearing outer ring (1) is located at both ends of the raceway (13) and is sunken to form a mounting groove (11), wherein a retaining ring (2) is correspondingly mounted in the mounting groove (11), and the two retaining rings (2) limit the axial movement of the rolling element assembly (3); The mounting groove (11) adopts a trapezoidal structure with a small opening diameter and a large bottom diameter, and the angle R1 between the opening tangent of the mounting groove (11) and the end face of the bearing outer ring (1) is 80°.

2. The miniature needle roller bearing for automobiles according to claim 1, characterized in that: The rolling element assembly (3) comprises a retaining frame (4), wherein the retaining frame (4) has a plurality of limiting grooves (41) evenly distributed along its circumference, and a rolling element (5) is rotatably mounted in each limiting groove (41).

3. The miniature needle roller bearing for automobiles according to claim 1, characterized in that: Guide grooves (12) are provided on the end surfaces on both sides of the bearing outer ring (1) and are located outside the groove openings of the mounting groove (11).

4. The miniature needle roller bearing for automobiles according to claim 3, characterized in that: The guide groove (12) adopts a trapezoidal structure with a large diameter at the mouth and a small diameter at the bottom.

5. The miniature needle roller bearing for automobiles according to claim 4, characterized in that: The included angle R2 between the groove tangent line of the guide groove (12) and the cross section of the bearing outer ring (1) is 45°.

6. The miniature needle roller bearing for automobiles according to any one of claims 1 to 5, characterized in that: The retaining ring (2) is a butterfly-shaped structure with a concave center formed by stamping a steel plate, and the retaining ring (2) is press-fitted into the installation groove (11) and unfolded to become a flat retaining ring.

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