Needle bearing without retainer

Abstract

The utility model discloses a retainer-free needle roller bearing which comprises an outer ring, an inner ring and a plurality of needle rollers, a rolling groove is formed in the inner ring wall of the outer ring, a rolling groove is also formed in the outer ring wall of the inner ring, and the two rolling grooves form a channel structure for the needle rollers to roll. A containing groove used for containing the end of the roller pin is formed in the groove wall of the rolling groove in the outer ring wall of the inner ring, a contact block is arranged on the groove wall of the containing groove, and the contact block makes contact with the side face of the roller pin. According to the needle roller bearing without the retainer, due to the arrangement of the containing grooves and the contact blocks on the groove walls of the containing grooves, friction between the needle rollers and the containing grooves can be effectively reduced, and then the effect that the rolling resistance of the needle rollers is reduced is achieved.

Description

Technical Field

[0001] The utility model relates to a needle roller bearing, more specifically to a needle roller bearing without a retainer. Background Art

[0002] Needle roller bearings are actually a special type of cylindrical roller bearings, except that the length of the rolling element is many times larger than its diameter. The improved roller and raceway profile can prevent stress concentration. Needle roller bearings are equipped with thin and long rollers, so the radial structure is compact. When its inner diameter size and load capacity are the same as those of other types of bearings, the outer diameter is the smallest, which is particularly suitable for support parts with limited radial installation dimensions.

[0003] Needle roller bearings in the prior art currently include types with cages and types without cages. Types without cages mainly achieve the function of the cage by opening a groove for accommodating the needle roller on the outer wall of the inner ring. However, the existing groove structures for accommodating needle rollers all adopt a rectangular structure. Therefore, when the needle roller rolls in the groove, it is mostly in surface contact with the groove wall of the groove. Therefore, there is more friction between the needle roller and the groove, which will increase the wear between the needle roller and the groove on the one hand, and increase the rolling resistance of the needle roller on the other hand. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a cageless needle roller bearing with lower friction between the needle roller and the groove and lower rolling resistance.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cageless needle roller bearing, comprising an outer ring, an inner ring and a plurality of needle rollers, the inner ring wall of the outer ring is provided with a rolling groove, the outer ring wall of the inner ring is also provided with a rolling groove, the two rolling grooves constitute a channel structure for the needle rollers to roll, the groove wall of the rolling groove on the outer ring wall of the inner ring is provided with a receiving groove for accommodating the end of the needle roller, the groove wall of the receiving groove is provided with a contact block, and the contact block is in contact with the side of the needle roller.

[0006] As a further improvement of the present invention, the side of the groove wall of the contact block facing away from the accommodating groove is an arc-shaped surface structure, and the arc-shaped surface structure contacts the side surface of the needle roller.

[0007] As a further improvement of the present invention, the side of the groove wall of the contact block facing away from the accommodating groove is a spherical structure, and the spherical structure contacts the side surface of the needle roller.

[0008] As a further improvement of the utility model, a contact cone is provided on the groove wall of the accommodating groove on the side opposite to the end of the needle roller, and the cone end of the contact cone adopts a spherical structure, and the spherical structure contacts the end of the needle roller.

[0009] The beneficial effect of the utility model is that, by setting the rolling groove and the receiving groove, it is possible to utilize the receiving groove to limit the end of the needle roller and realize the function of the retaining frame, thereby effectively reducing the contact area between the needle roller and the rolling groove of the outer wall of the inner ring and reducing friction. By setting a contact block on the groove wall of the receiving groove, the contact area between the side of the needle roller and the groove wall of the receiving groove can be further reduced, thereby further reducing the friction of the needle roller and reducing the rolling resistance of the needle roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the inner ring and needle roller combination. DETAILED DESCRIPTION

[0011] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0012] Reference Figure 1 As shown, a cageless needle roller bearing of the present embodiment comprises an outer ring, an inner ring 2 and a plurality of needle rollers 3. A rolling groove is provided on the inner ring wall of the outer ring, and a rolling groove is also provided on the outer ring wall of the inner ring 2. The two rolling grooves constitute a channel structure for the needle roller 3 to roll. A receiving groove 4 for accommodating the end of the needle roller 3 is provided on the rolling groove wall on the outer ring wall of the inner ring 2. A contact block 5 is provided on the groove wall of the accommodating groove 4, and the contact block 5 is in contact with the side of the needle roller 3. In the process of using the cageless needle roller bearing of the present embodiment, it is only necessary to install the inner ring 2 and the outer ring on an external device. In the process of operation of the needle roller bearing, the function of the cage can be effectively played by the effect of the accommodating groove 4. By setting the contact block 5, the contact surface with the needle roller 3 can be further reduced, the friction of the needle roller 3 can be further reduced, and the resistance of the needle roller 3 when rolling can be reduced.

[0013] As an improved specific implementation, the side of the groove wall of the contact block 5 facing away from the accommodating groove 4 is an arc-shaped surface structure, and the arc-shaped surface structure contacts the side of the needle roller 3. Through the setting of the arc-shaped surface structure, it is possible to effectively reduce the contact surface while increasing the wear resistance of the contact block 5.

[0014] As an improved specific implementation, the side of the groove wall of the contact block 5 facing away from the accommodating groove 4 is a spherical structure, and the spherical structure contacts the side of the needle roller 3. By setting the spherical structure, the contact area can be minimized and the resistance of the needle roller 3 during operation can be minimized.

[0015] As an improved specific implementation method, a contact cone 6 is provided on the groove wall of the accommodating groove 4 on the side opposite to the end of the needle roller 3. The cone end of the contact cone 6 adopts a spherical structure, and the spherical structure contacts the end of the needle roller 3. Through the setting of the contact cone 6, the contact area between the end face of the needle roller 3 and the groove wall of the accommodating groove 4 can be effectively reduced, thereby reducing the rolling resistance of the needle roller 3.

[0016] In summary, by configuring the outer ring, the inner ring 2 and a plurality of needle rollers 3, a needle roller bearing structure can be effectively formed, and by configuring the rolling groove, the receiving groove 4 and the contact block 5, it is possible to achieve the function of a retaining frame while reducing the friction force on the needle roller 3 and the resistance of the needle roller 3 during its operation.

[0017] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A cageless needle roller bearing, comprising an outer ring, an inner ring (2) and a plurality of needle rollers (3), wherein a rolling groove is provided on the inner ring wall of the outer ring, and a rolling groove is also provided on the outer ring wall of the inner ring (2), and the two rolling grooves constitute a channel structure for the needle rollers (3) to roll, characterized in that: The rolling groove wall on the outer ring wall of the inner ring (2) is provided with a receiving groove (4) for receiving the end of the needle roller (3), and the groove wall of the receiving groove (4) is provided with a contact block (5), and the contact block (5) is in contact with the side of the needle roller (3).

2. The cageless needle roller bearing according to claim 1, characterized in that: The side of the groove wall of the contact block (5) facing away from the accommodating groove (4) is an arc-shaped surface structure, and the arc-shaped surface structure is in contact with the side surface of the needle roller (3).

3. The cageless needle roller bearing according to claim 1, characterized in that: The side of the groove wall of the contact block (5) facing away from the accommodating groove (4) is a spherical structure, and the spherical structure contacts the side surface of the needle roller (3).

4. The cageless needle roller bearing according to claim 3, characterized in that: A contact cone (6) is provided on the groove wall of the accommodating groove (4) on the side opposite to the end of the needle roller (3). The cone end of the contact cone (6) adopts a spherical structure, and the spherical structure contacts the end of the needle roller (3).

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