Pointed-end full-complement needle bearing

Abstract

The utility model discloses a pointed-end full-complement needle bearing and relates to the technical field of bearings. The problems that when an existing needle bearing is used, a rolling body in the bearing can fall off, and the rolling body is prone to scattering during transportation or installation are solved. The two ends of the inner wall of the outer ring 1 are each provided with an annular groove, the interiors of the two annular grooves in the inner wall of the outer ring 1 are each provided with a cover 3 in an embedded mode, an annular protrusion is machined in the middle of the side end face of each cover 3, and a plurality of roller pins 2 are evenly arranged between the inner surface of the outer ring 1 and the outer surfaces of the annular protrusions on the side end faces of the covers 3 in the circumferential direction. The centers of the two end faces of each roller pin 2 are each provided with a pointed-end protrusion 2-2, the outer surfaces of the pointed-end protrusions 2-2 are in contact rolling connection with the outer surfaces of the annular protrusions on the side end face of the cover 3, and a limiting annular fixing groove is machined in one side of each annular groove in the inner wall of the outer ring 1. And a spring retainer ring 4 is embedded in the limiting annular fixing groove.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a pointed full-complement needle roller bearing. Background Art

[0002] At present, the rolling element of needle roller bearings is needle rollers, which are usually 3 to 10 times longer than their diameters and are slender. Therefore, needle roller bearings have a compact radial structure. When the inner diameter and load-bearing capacity are the same as those of other types of bearings, the outer diameter is the smallest, making them particularly suitable for support structures with restricted radial installation dimensions.

[0003] In some special working conditions, precision parts with narrow space have extremely high requirements for bearing capacity, and full-filled needle rollers without inner rings are generally used to improve the bearing bearing capacity. Usually, full-filled roller bearings without inner rings can ensure self-locking of the rolling elements through special calculations to prevent the rolling elements from falling off and loosening during transportation and installation, but miniature needle roller bearings used in specific locations are not easy to achieve self-locking.

[0004] In summary, the rolling elements in the existing needle roller bearings may fall off when in use, and may be easily scattered during transportation or installation. Utility Model Content

[0005] The utility model provides a pointed full-complement needle roller bearing to solve the problems that the rolling elements in the existing needle roller bearings may fall off when in use and may be easily scattered during transportation or installation.

[0006] The utility model discloses a pointed full-complement needle roller bearing, the specific structure of which comprises an outer ring 1, a needle roller 2, a cover 3 and a spring retaining ring 4;

[0007] An annular groove is processed at both ends of the inner wall of the outer ring 1, and a cover 3 is embedded in the two annular grooves on the inner wall of the outer ring 1, and an annular protrusion is processed in the middle of the side end face of each cover 3. A plurality of needle rollers 2 are evenly arranged along the circumferential direction between the inner surface of the outer ring 1 and the outer surface of the annular protrusion on the side end face of the cover 3, and a pointed protrusion 2-2 is respectively provided at the center of the two end faces of each needle roller 2. The outer surface of the pointed protrusion 2-2 is in contact and rolling connection with the outer surface of the annular protrusion on the side end face of the cover 3. A limiting annular fixing groove is processed on one side of each annular groove on the inner wall of the outer ring 1, and a spring clamp 4 is embedded in the limiting annular fixing groove;

[0008] Furthermore, the two limiting annular fixing grooves on the inner wall of the outer ring 1 are symmetrically arranged;

[0009] Furthermore, the depth of the annular groove on the inner wall of the outer ring 1 is less than the depth of the limiting annular fixing groove;

[0010] Furthermore, the needle working surface 2-1 of the needle roller 2 is in contact and rolling connection with the inner surface of the outer ring 1;

[0011] Furthermore, the length L1 of the pointed protrusion 2-2 at the end of the needle roller 2 is 0.8 mm to 1 mm;

[0012] Furthermore, the outer ring 1, the two covers 3 and the two spring collars 4 are coaxially arranged;

[0013] Furthermore, the needle roller bearing has a higher load-bearing capacity among bearings of the same size, and has the smallest outer diameter and is flexible to install. The load-bearing capacity is greatly improved after the retaining cage is removed and fully loaded. However, there is no retaining cage to fix it. The cover 3 and the customized needle roller 2 are used to prevent the rolling body from falling off during transportation and installation. The cover 3 not only locks the needle roller 2 but also acts as a seal.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The utility model overcomes the shortcomings of the prior art. A plurality of needle rollers are evenly arranged along the circumferential direction between the inner surface of the outer ring and the outer surface of the annular protrusion on the side end surface of the cover, and a pointed protrusion is respectively provided at the center of the two end surfaces of each needle roller. The outer surface of the pointed protrusion is in contact and rolling connection with the outer surface of the annular protrusion on the side end surface of the cover. The application optimizes the bearing rolling element into a needle roller with a pointed protrusion. The pointed protrusion cooperates with the cover to prevent the rolling element from falling off, thereby avoiding the phenomenon that the bearing is easily scattered during transportation or installation.

[0016] 2. The utility model overcomes the shortcomings of the prior art. A limiting annular fixing groove is machined on one side of each annular groove on the inner wall of the outer ring. A spring clamp is embedded in the limiting annular fixing groove. The cover and the spring clamp are fixed by controlling the sizes of the annular groove on the inner wall of the outer ring and the limiting annular fixing groove. At the same time, the axial movement of the rolling body can be prevented, and a sealing effect is also achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a main sectional view of a pointed full-complement needle roller bearing described in the utility model;

[0018] Figure 2 It is a front view of a needle roller in a pointed full-complement needle roller bearing described in the utility model. DETAILED DESCRIPTION

[0019] Specific implementation method 1: Combination Figure 1 and Figure 2 The present embodiment is described. The pointed full-complement needle roller bearing described in the present embodiment comprises an outer ring 1, a needle roller 2, a cover 3 and a spring retaining ring 4;

[0020] An annular groove is processed at both ends of the inner wall of the outer ring 1, and a cover 3 is embedded in the two annular grooves on the inner wall of the outer ring 1, and an annular protrusion is processed in the middle of the side end face of each cover 3. A plurality of needle rollers 2 are evenly arranged along the circumferential direction between the inner surface of the outer ring 1 and the outer surface of the annular protrusion on the side end face of the cover 3, and a pointed protrusion 2-2 is respectively provided at the center of the two end faces of each needle roller 2. The outer surface of the pointed protrusion 2-2 is in contact and rolling connection with the outer surface of the annular protrusion on the side end face of the cover 3. A limiting annular fixing groove is processed on one side of each annular groove on the inner wall of the outer ring 1, and a spring clamp 4 is embedded in the limiting annular fixing groove;

[0021] In this specific embodiment, the needle roller bearing has a higher load-bearing capacity among bearings of the same size, and has the smallest outer diameter and is flexible to install. The load-bearing capacity is greatly improved after the retaining cage is removed and fully loaded. However, there is no retaining cage to fix it. The cover 3 and the customized needle roller 2 are used to prevent the rolling body from falling off during transportation and installation. The cover 3 not only locks the needle roller 2 but also plays a sealing role.

[0022] Specific implementation method 2: Combination Figure 1 and Figure 2 This embodiment is described as a further limitation of the bearing described in the first embodiment. In the pointed full-fill needle roller bearing described in this embodiment, the two limiting annular fixing grooves on the inner wall of the outer ring 1 are symmetrically arranged.

[0023] Specific implementation method three: Combination Figure 1 and Figure 2 This embodiment is described as a further limitation of the bearing described in the second embodiment. In the pointed full-filled needle roller bearing described in this embodiment, the depth of the annular groove on the inner wall of the outer ring 1 is less than the depth of the limiting annular fixing groove.

[0024] Specific implementation method four: Combination Figure 1 and Figure 2 This embodiment is described as a further limitation of the bearing described in the first embodiment. This embodiment is a pointed full-filled needle roller bearing, in which the needle working surface 2-1 of the needle roller 2 is in contact and rolling connection with the inner surface of the outer ring 1.

[0025] Specific implementation method five: Combination Figure 1 and Figure 2 This embodiment is described as a further limitation of the bearing described in the first embodiment. The pointed full-fill needle roller bearing described in this embodiment has a length L1 of the pointed protrusion 2-2 at the end of the needle roller 2 of 0.8 mm to 1 mm.

[0026] Specific implementation method six: Combination Figure 1 and Figure 2 The present embodiment is described as a further limitation of the bearing described in the first embodiment. The present embodiment is a pointed full-complement needle roller bearing, wherein the outer ring 1, two covers 3 and two spring retaining rings 4 are coaxially arranged.

Claims

1. A pointed full complement needle roller bearing, characterized in that: It comprises an outer ring (1), a needle roller (2), a cover (3) and a spring collar (4); An annular groove is processed at both ends of the inner wall of the outer ring (1), and a cover (3) is embedded in the two annular grooves on the inner wall of the outer ring (1). An annular protrusion is processed in the middle of the side end face of each cover (3). A plurality of needle rollers (2) are evenly arranged along the circumferential direction between the inner surface of the outer ring (1) and the outer surface of the annular protrusion on the side end face of the cover (3), and a pointed protrusion (2-2) is respectively provided at the center of the two end faces of each needle roller (2). The outer surface of the pointed protrusion (2-2) is in contact and rolling connection with the outer surface of the annular protrusion on the side end face of the cover (3). A limiting annular fixing groove is processed on the side of each annular groove on the inner wall of the outer ring (1), and a spring retaining ring (4) is embedded in the limiting annular fixing groove.

2. A pointed full complement needle roller bearing according to claim 1, characterized in that: The two limiting annular fixing grooves on the inner wall of the outer ring (1) are symmetrically arranged.

3. A pointed full complement needle roller bearing according to claim 2, characterized in that: The depth of the annular groove on the inner wall of the outer ring (1) is smaller than the depth of the limiting annular fixing groove.

4. A pointed full complement needle roller bearing according to claim 1, characterized in that: The needle roller working surface (2-1) of the needle roller (2) is in contact and rolling connection with the inner surface of the outer ring (1).

5. The pointed full complement needle roller bearing according to claim 1, characterized in that: The length L1 of the pointed protrusion (2-2) at the end of the needle roller (2) is 0.8 mm to 1 mm.

6. A pointed full complement needle roller bearing according to claim 1, characterized in that: The outer ring (1), the two covers (3) and the two spring collars (4) are coaxially arranged.

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