Pointed-end low-friction roller pin

Abstract

The utility model provides a pointed-end low-friction roller pin which comprises a roller pin body, the roller pin body comprises a rolling part, a first protruding part and a second protruding part, the first protruding part and the second protruding part are arranged at the two ends of the rolling part, the rolling part is cylindrical, and the first protruding part and the second protruding part are conical. At least one oil guide groove is formed in the surface of the roller pin body, the extending direction of the oil guide groove is located on the axial plane of the roller pin body, and one end of the oil guide groove is located on the surface of the first protruding part / the second protruding part. And the other end of the spring extends to the surface of the rolling part or extends to the surface of the other second lug boss / first lug boss. The oil guide groove is formed in the needle roller body and provides a channel for conveying lubricating oil from the rolling part to the protruding part, so that it is guaranteed that the lubricating oil can flow to the two ends of the needle roller body, friction force at the ends is prevented from being increased, and the reliability of the needle roller bearing is improved.

Description

Technical Field

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

[0002] Needle roller bearings use needle rollers as rolling elements and are generally composed of an inner ring, an outer ring, and a cage. The needle rollers are mounted on the cage and roll as the bearing rotates, carrying the transmission force. In existing technology, needle rollers are typically slender, cylindrical, with their surfaces in contact with the inner and outer rings. Friction generates heat at these surfaces. Poor lubrication prevents heat dissipation, leading to overheating of the bearing.

[0003] Patent CN203847563U discloses a pointed needle roller with a conical outer end, which reduces friction between the needle roller end face and the inner end face of the bearing outer ring. However, this needle roller structure hinders the flow of lubricating oil to the needle roller end face, resulting in increased friction after long-term use and even causing the bearing to seize. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the utility model is to develop a new pointed needle roller structure, which can lubricate the end face of the needle roller, reduce the friction of the end face of the needle roller, and improve the reliability of the needle roller bearing.

[0005] To achieve the above-mentioned purpose, the utility model provides a pointed low-friction needle roller, including a needle roller body, the needle roller body including a rolling portion and a first protrusion and a second protrusion arranged at both ends of the rolling portion, the rolling portion is cylindrical, the first protrusion and the second protrusion are conical, the first protrusion and the second protrusion are symmetrically arranged, the first protrusion, the second protrusion and the rolling portion are coaxial, the surface of the needle roller body is provided with at least one oil guide groove, the extension direction of the oil guide groove is located on the axial plane of the needle roller body, one end of the oil guide groove is located on the surface of the first protrusion / the second protrusion, and the other end extends to the surface of the rolling portion or extends to the surface of the other second protrusion / first protrusion, and the surfaces of the first protrusion and the second protrusion have at least one section of the oil guide groove.

[0006] The utility model provides an oil guide groove on the needle roller body, which provides a channel for conveying lubricating oil from the rolling part to the raised part, thereby ensuring that the lubricating oil can flow to both ends of the needle roller body, avoiding increase in end friction, and improving the reliability of the needle roller bearing.

[0007] Furthermore, the oil guide groove extends along the surface of the first and / or second raised portions for a length greater than or equal to half the length of the generatrix of the first and / or second raised portions. The greater extension of the oil guide groove along the raised portions ensures that lubricating oil can be delivered to the end of the needle roller body.

[0008] Furthermore, the extension length of the oil guide groove on the surface of the rolling part is greater than or equal to half of the length of the generatrix of the rolling part. The longer extension length of the oil guide groove on the rolling part is conducive to ensuring that all parts of the needle roller body can evenly contact the lubricating oil.

[0009] Furthermore, the width W of the oil guide groove and the diameter D of the rolling portion satisfy the relationship: 1 / 5 ≥ W / D ≥ 1 / 20. The width of the oil guide groove is limited to ensure the lubricating oil delivery effect while avoiding excessive impact on the surface friction coefficient.

[0010] Furthermore, the depth d of the oil guide groove and the diameter D of the rolling portion satisfy the relationship: 1 / 10≥d / D≥1 / 50. The depth of the oil guide groove is limited to reduce the processing difficulty while ensuring the lubricating oil delivery effect.

[0011] Furthermore, the ends of the oil guide groove extend to the surfaces of the first and second protrusions, respectively. The number of the oil guide grooves ranges from 2 to 6, and the oil guide grooves are evenly distributed along the circumference of the needle roller body. Providing multiple evenly distributed oil guide grooves facilitates spreading the lubricating oil across the surface of the needle roller body, achieving excellent lubrication.

[0012] Furthermore, the oil guide groove is divided into a first oil guide groove and a second oil guide groove. The first oil guide groove has two ends located on the surface of the first protrusion and the rolling portion, respectively, while the second oil guide groove has two ends located on the surface of the second protrusion and the rolling portion, respectively. There are two to six first oil guide grooves and two to six second oil guide grooves. Each first oil guide groove is evenly distributed along the circumference of the needle roller body, and each second oil guide groove is evenly distributed along the circumference of the needle roller body. The first and second oil guide grooves are staggered. This structure can reduce the length of a single oil guide groove, facilitating processing. The staggered distribution of the first and second oil guide grooves can achieve excellent lubrication.

[0013] Furthermore, the raised portion and the rolling portion are integrally formed, which facilitates production and processing and ensures structural strength.

[0014] Furthermore, the bottom diameter of the raised portion is smaller than the bottom diameter of the rolling portion. The raised portion is a small-sized structure, which is beneficial to reducing friction on the end face of the needle roller.

[0015] Furthermore, the raised portion and the rolling portion are connected via an arcuate transition structure, which facilitates the processing and forming of the raised portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a pointed low-friction needle roller in an embodiment of the present utility model.

[0017] Figure 2 This is a radial cross-sectional view of a pointed low-friction needle roller in another embodiment of the present invention.

[0018] Figure 3 This is a perspective structural diagram of a pointed low-friction needle roller in another embodiment of the present invention.

[0019] Description of reference numerals:

[0020] 1- rolling portion, 2- first protrusion, 3- second protrusion, 4- oil guide groove, 41- first oil guide groove, 42- second oil guide groove. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0023] It should be noted that similar numbers and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0024] Combine Figure 1 As shown, this embodiment provides a pointed low-friction needle roller, comprising a cylindrical needle roller body with two conical protrusions at either end, namely a first protrusion 2 and a second protrusion 3. The first protrusion 2 and the second protrusion 3 are symmetrically arranged, and the first protrusion 2, the second protrusion 3, and the rolling portion 1 are coaxial. The conical protrusions help reduce friction on the end face of the needle roller.

[0025] Preferably, the raised portion and the rolling portion 1 are integrally formed, generally processed by a cutting process, and the bottom diameter of the raised portion is smaller than the bottom diameter of the rolling portion 1, and the raised portion and the rolling portion 1 are connected by an arc surface transition.

[0026] Combine Figure 1 As shown, the needle roller body is provided with an oil guide groove 4 extending in the axial plane of the needle roller body. One end of the oil guide groove 4 is located on the surface of the first raised portion 2, while the other end passes through the entire rolling portion 1 and extends to the surface of the second raised portion 3. When the needle roller is in use, lubricating oil enters the oil guide groove 4 and is transported from the surface of the rolling portion 1 to the raised portions on both sides along the oil guide groove 4. This ensures that the lubricating oil flows to both ends of the needle roller body, preventing increased friction at the ends and improving the reliability of the needle roller bearing.

[0027] In this embodiment, there is one oil guide groove 4, with its ends located on the first raised portion 2 and the second raised portion 3, respectively. Lubricating oil is delivered to both ends of the needle roller via this single oil guide groove 4. In other embodiments, there may be multiple oil guide grooves 4, with one end located on the first raised portion 2 or the second raised portion 3 and the other end located on the rolling portion 1. In other words, different oil guide grooves 4 deliver lubricating oil to both ends of the needle roller.

[0028] In this embodiment, the oil guide groove 4 extends along the surface of the first raised portion 2 for a length equal to half the length of the generatrix of the first raised portion 2, and along the surface of the second raised portion 3 for a length equal to half the length of the generatrix of the second raised portion 3, thereby ensuring that lubricating oil is effectively transported to the end portions. In other embodiments, the oil guide groove 4 extends along the surface of the first raised portion 2 and / or the second raised portion 3 for a length greater than or equal to half the length of the generatrix of the first raised portion 2 and / or the second raised portion 3.

[0029] In this embodiment, the oil guide groove 4 passes through the entire rolling portion 1, and its extension length on the surface of the rolling portion 1 is equal to the generatrix length of the rolling portion 1. In other embodiments, the extension length of the oil guide groove 4 on the surface of the rolling portion 1 is greater than or equal to one-half of the generatrix length of the rolling portion 1 to ensure uniform distribution of the lubricating oil.

[0030] Combine Figure 2 As shown, this embodiment provides another pointed low-friction needle roller. Three oil guide grooves 4 are provided on the surface of the needle roller body, with each groove 4 located at its ends at the first raised portion 2 and the second raised portion 3, respectively. The three oil guide grooves 4 are evenly distributed along the circumference of the needle roller body, with the angle between adjacent oil guide grooves 4 being 120°. Providing multiple, evenly distributed oil guide grooves 4 facilitates distributing lubricating oil across the entire surface of the needle roller body, achieving excellent lubrication. In other embodiments, the number of oil guide grooves 4 is preferably 2 to 6, and each oil guide groove 4 is evenly distributed along the circumference of the needle roller body.

[0031] In this embodiment, the depth d of the oil guide groove 4, the width W of the oil guide groove 4, and the diameter D of the rolling portion 1 satisfy the relationship: d = W = 1 / 20 D. In other embodiments, the dimensions of the oil guide groove 4 are limited, where the width W of the oil guide groove 4 and the diameter D of the rolling portion 1 satisfy the relationship: 1 / 5 ≥ W / D ≥ 1 / 20. This ensures efficient lubricating oil delivery while avoiding excessive impact on the surface friction coefficient. The depth d of the oil guide groove 4 and the diameter D of the rolling portion 1 satisfy the relationship: 1 / 10 ≥ d / D ≥ 1 / 50. Limiting the depth of the oil guide groove 4 reduces processing difficulty while ensuring efficient lubricating oil delivery.

[0032] Combine Figure 3 As shown, this embodiment provides another pointed low-friction needle roller. Four oil guide grooves 4 are provided on the surface of the needle roller body, two of which are defined as first oil guide grooves 41, and the other two as second oil guide grooves 42. The ends of the first oil guide groove 41 are located on the surfaces of the first raised portion 2 and the rolling portion 1, respectively. The ends of the second oil guide groove 42 are located on the surfaces of the second raised portion 3 and the rolling portion 1, respectively. The two first oil guide grooves 41 are symmetrically arranged on either side of the needle roller body, and the two second oil guide grooves 42 are symmetrically arranged on either side of the needle roller body. The first oil guide grooves 41 and the second oil guide grooves 42 are staggered. This structure ensures that the lubricating oil is evenly distributed throughout the needle roller body, achieving excellent lubrication.

[0033] In other embodiments, the number of first oil guide grooves 41 can be selected from 3 to 6, and each first oil guide groove 41 is evenly distributed along the circumference of the needle roller body; the number of second oil guide grooves can be selected from 2 to 6, and each second oil guide groove 42 is evenly distributed along the circumference of the needle roller body, and the first oil guide grooves 41 and the second oil guide grooves 42 are staggered.

[0034] Compared with the pointed needle roller of the prior art, the pointed needle roller with the oil guide groove 4 provided in the above embodiment has the following advantages: the oil guide groove 4 provides a channel for transporting lubricating oil from the rolling portion 1 to the raised portion, thereby ensuring that the lubricating oil can flow to both ends of the needle roller body, reducing the friction of the needle roller end face, and improving the reliability of the needle roller bearing; and this needle roller structure is easy to process and suitable for industrial promotion.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pointed low-friction needle roller, characterized in that: The invention comprises a needle roller body, wherein the needle roller body comprises a rolling portion (1) and a first protrusion (2) and a second protrusion (3) arranged at both ends of the rolling portion (1), the rolling portion (1) is cylindrical, the first protrusion (2) and the second protrusion (3) are conical, the first protrusion (2) and the second protrusion (3) are symmetrically arranged, the first protrusion (2), the second protrusion (3) and the rolling portion (1) are coaxial, the surface of the needle roller body is provided with at least one oil guide groove (4), the extension direction of the oil guide groove (4) is located on the axial plane of the needle roller body, one end of the oil guide groove (4) is located on the surface of the first protrusion (2) / the second protrusion (3), and the other end extends to the surface of the rolling portion (1) or extends to the surface of the other second protrusion (3) / the first protrusion (2), and the surfaces of the first protrusion (2) and the second protrusion (3) have at least one section of the oil guide groove (4).

2. The pointed low-friction needle roller according to claim 1, characterized in that: The extension length of the oil guide groove (4) on the surface of the first raised portion (2) and / or the second raised portion (3) is greater than or equal to half the length of the generatrix of the first raised portion (2) and / or the second raised portion (3).

3. The pointed low-friction needle roller according to claim 2, characterized in that: The extension length of the oil guide groove (4) on the surface of the rolling portion (1) is greater than or equal to half the generatrix length of the rolling portion (1).

4. The pointed low-friction needle roller according to claim 1, characterized in that: The width W of the oil guide groove (4) and the diameter D of the rolling portion (1) satisfy the relationship: 1 / 5≥W / D≥1 / 20.

5. The pointed low-friction needle roller according to claim 4, characterized in that: The depth d of the oil guide groove (4) and the diameter D of the rolling portion (1) satisfy the relationship: 1 / 10≥d / D≥1 / 50.

6. The pointed low-friction needle roller according to claim 1, characterized in that: Both ends of the oil guide groove (4) extend to the surface of the first raised portion (2) and the second raised portion (3), respectively. The number of the oil guide grooves (4) is 2 to 6, and the oil guide grooves (4) are evenly distributed along the circumference of the needle roller body.

7. The pointed low-friction needle roller according to claim 1, characterized in that: The oil guide groove (4) is divided into a first oil guide groove (41) and a second oil guide groove (42), the two ends of the first oil guide groove (41) are respectively located on the surface of the first protrusion (2) and the rolling part (1), and the two ends of the second oil guide groove (42) are respectively located on the surface of the second protrusion (3) and the rolling part (1). The number of the first oil guide grooves (41) is 2 to 6, and the number of the second oil guide grooves (42) is 2 to 6. Each of the first oil guide grooves (41) is evenly distributed along the circumference of the needle roller body, and each of the second oil guide grooves (42) is evenly distributed along the circumference of the needle roller body. The first oil guide grooves (41) and the second oil guide grooves (42) are staggered.

8. The pointed low-friction needle roller according to any one of claims 1 to 7, characterized in that: The raised portion and the rolling portion (1) are integrally formed.

9. The pointed low-friction needle roller according to claim 8, characterized in that: The bottom diameter of the raised portion is smaller than the bottom diameter of the rolling portion (1).

10. The pointed low-friction needle roller according to claim 9, characterized in that: The raised portion and the rolling portion (1) are connected via an arc surface transition.

Images