WO2016125573A1

WO2016125573A1 - Needle roller bearing

Info

Publication number: WO2016125573A1
Application number: PCT/JP2016/051359
Authority: WO
Inventors: 修光前田
Original assignee: Ntn株式会社
Priority date: 2015-02-04
Filing date: 2016-01-19
Publication date: 2016-08-11
Also published as: JP2016142391A

Abstract

In the present invention, a needle roller bearing is provided with a plurality of needle rollers (10) and a cage that includes: a pair of annular ring parts (11, 11); a plurality of column parts (12, 12) that connect the pair of ring parts (11, 11) to each other; and a plurality of pocket parts (13, 13) that accommodate the needle roller (10) between the adjacent column parts (12). At least one roller stop part (19, 20) is formed at a wall surface (12a) of the column part (12), and at least one groove part (21, 22) is formed at the center part of the at least one roller stop part (19, 20) so as to extend along the radial direction.

Description

Needle roller bearing

The present invention relates to a needle roller bearing, and more particularly to a needle roller bearing used for an automobile transmission, an engine connecting rod, and the like.

2. Description of the Related Art Conventionally, planetary gears and idlers for automatic transmissions for automobiles, and connecting rod large end bearings for motorcycle engines, etc., are cage and roller type needle rollers composed of a roller and a cage that holds the roller. Bearings are often used. Such a bearing is described in, for example, Japanese Unexamined Patent Publication No. 2000-274439 (Patent Document 1).

Patent Document 1 describes a needle roller bearing including a needle roller and a cage having a plurality of pocket portions for accommodating the needle roller. A roller stopper is provided in the pocket portion of the cage of the needle roller bearing, and the needle roller is held by the roller stopper without being detached from the pocket portion.

JP 2000-274439 A

By the way, the needle roller bearing described in Patent Document 1 tends to be used in an environment where there is not enough lubricant. For this reason, the amount of lubricating oil in the needle roller bearing is small, and the viscosity of the lubricating oil is small. Therefore, depending on the lubrication conditions, damage such as peeling may occur due to insufficient lubrication.

In the case of the shape of the cage of the needle roller bearing, since the rolling surface of the needle roller and the roller stopper of the cage are kept in contact when the bearing is used, lubrication on the rolling surface of the needle roller is performed. Oil is scraped off by friction with the roller stopper of the cage. As a result, the amount of oil existing on the rolling surface of the needle roller is reduced, and the oil film thickness on the rolling surface of the needle roller is reduced. For this reason, there is a problem that the metal portions of the rolling surface and the raceway surface of the needle rollers are easily in direct contact with each other, and damage such as peeling is likely to occur.

Therefore, in view of such a situation, the present invention has an object to provide a needle roller bearing that can prevent oil film breakage that occurs at a contact portion between the needle roller and the stopper and can ensure the oil film thickness. And

The needle roller bearing according to the present invention includes a plurality of needle rollers, a pair of ring-shaped ring portions, a plurality of column portions interconnecting the pair of ring portions, and the adjacent column portions. A roller bearing having a plurality of pocket portions for accommodating the needle rollers, wherein at least one roller stopper is formed on the wall surface of the column portion, the at least one roller stopper At least one groove portion extending in the radial direction is formed in the central portion of the portion.

According to the needle roller bearing configured as described above, since at least one groove portion extending in the radial direction is formed in the central portion of at least one roller stopper portion, the location where the groove portion of the roller stopper portion is provided is In addition, it does not come into contact with the rolling surface of the needle roller, and the lubricating oil on the rolling surface of the needle roller is less likely to be scraped off by friction with the roller stopper of the cage.

In addition, since the lubricating oil can be stored in the groove, the lubricating oil stored in the groove during use lubricates the rolling surface, so that the oil film thickness at the contact surface between the rolling surface of the needle roller and the stopper is obtained. Can be secured. For this reason, it becomes difficult for the metal parts of the rolling surface and the raceway surface of the needle roller to be in direct contact with each other, and damage such as peeling is less likely to occur.

As one aspect of the present invention, the column portion is a column center portion positioned relatively radially inward in the axial center region, and a pair of column ends positioned relatively radially outward in the axial end region. And a pair of column inclined portions located between the column center portion and each of the pair of column end portions, and preferably face the rolling surfaces of the plurality of needle rollers.

According to the needle roller bearing having the above-described configuration, the roller stopper can be formed on at least one of the column central portion, the pair of column end portions, and the pair of column inclined portions. For this reason, since the area where the lubricating oil is accumulated in the groove portion of the roller stopper increases, the lubricating oil stored in the groove during use lubricates the rolling surface, so that the rolling surface of the needle roller contacts the stopper portion. The oil film thickness at the contact portion can be further ensured. Thereby, the metal portions of the rolling surface and the raceway surface of the needle roller are less likely to be in direct contact with each other, and damage such as peeling is less likely to occur.

As another aspect of the present invention, the roller stopper includes a first roller stopper adjacent to one axial side of the groove and a second roller stopper adjacent to the other axial side of the groove. Is preferred.

According to the needle roller bearing configured as described above, the first roller stopper and the second roller stopper can secure the contact area between the rolling surface of the needle roller and the stopper. The oil film thickness at the contact portion with the moving surface and the stop portion can be ensured.

As another aspect of the present invention, it is preferable that the at least one groove is formed so as to extend through the roller stopper in the radial direction.

According to the needle roller bearing configured as described above, the groove portion is formed so as to extend through the roller stopper portion in the radial direction, and therefore lubrication is ensured while ensuring the amount of lubricating oil on the rolling surface of the needle roller. Oil can flow over the rolling surface and the raceway surface of the needle roller through the penetrated groove, and the oil film thickness at the contact surface with the rolling surface of the needle roller and the stopper is further secured. can do.

As still another aspect of the present invention, it is preferable that the at least one groove portion does not penetrate the roller stopper in the radial direction.

According to the needle roller bearing configured as described above, it is possible to achieve the same effect as the needle roller bearing.

As another aspect of the present invention, it is preferable that a through groove along the axial direction is formed in the approximate center of the end surface of the pocket portion of the cage.

According to the needle roller bearing configured as described above, the lubricating oil can also flow into the through groove provided in the approximate center of the end surface of the pocket portion of the cage, and the lubricating oil not only in the radial direction but also through the through groove. It can pass through the entire needle roller bearing in the axial direction. For this reason, a decrease in the oil film thickness in the needle roller bearing can be suppressed, and the oil film thickness can be further ensured.

And, by maintaining the oil film thickness in the rolling surface of the needle roller, the raceway surface and the needle roller bearing, it becomes difficult for the metal parts of the rolling surface of the needle roller and the raceway surface to directly contact each other, The occurrence of peeling and the like can be further suppressed.

As still another aspect of the present invention, it is preferable that through grooves along the axial direction are formed at both ends of the pocket portion end face of the cage.

According to the needle roller bearing configured as described above, the lubricating oil can also flow through the through grooves provided at both ends of the pocket end face of the cage, and the lubricating oil passes through the through grooves as well as in the radial direction. Thus, the entire needle roller bearing can be extended in the axial direction. For this reason, a decrease in the oil film thickness in the needle roller bearing can be suppressed, and the oil film thickness can be further ensured.

As still another aspect of the present invention, it is preferable that the cage is made of a metal material selected from the group consisting of SCM415, S15CK, SPCC, and STKM12C.

As still another aspect of the present invention, the cage is preferably made of a polyamide resin selected from the group consisting of polyamide 46 and polyamide 66.

As described above, according to the needle roller bearing of the present invention, it is possible to prevent oil film breakage that occurs at the contact portion between the needle roller and the stopper, and to secure the oil film thickness. As a result, the oil film thickness on the rolling surface, raceway surface, and needle roller bearing of the needle roller is maintained, so that the metal portions of the rolling surface of the needle roller and the raceway surface are less likely to be in direct contact with each other. The occurrence of surface-origin damage such as peeling can be suppressed.

It is a figure showing a schematic structure of a maintenance machine concerning a first embodiment of the present invention. It is a figure which shows schematic structure of the needle roller bearing which concerns on 1st embodiment of this invention. It is an expanded sectional view of the pillar part of a cage concerning a first embodiment of the present invention, and is a figure showing signs that needle rollers were stored in a cage. It is an expanded sectional view of the pillar part of the cage concerning a first embodiment of the present invention, and is a figure showing signs that a penetration slot was formed in the approximate center of the diameter direction of a roller stop part. It is an expanded sectional view of the pillar part of the retainer concerning a second embodiment of the present invention, and is a figure showing signs that a non-penetrating groove was formed in the approximate center of the diameter direction of a roller stop part. It is an enlarged view of the pocket part of the holder | retainer which concerns on another embodiment of this invention, Comprising: It is a figure which shows a mode that the penetration groove | channel was formed in the approximate center of a pocket part end surface. It is an enlarged view of the pocket part of the holder | retainer concerning another embodiment of this invention, Comprising: It is a figure which shows a mode that the penetration groove | channel was formed in the both ends of a pocket part end surface.

The needle roller bearing according to the first embodiment of the present invention will be described below with reference to FIGS.
(First embodiment)
The needle roller bearing according to the present embodiment is, for example, for rotatably supporting a gear shaft of a planetary gear of an automobile transmission, an idler of a transmission, a connecting rod of an engine, and the like.

As shown in FIGS. 1 and 2, the needle roller bearing 50 according to the present embodiment includes a plurality of

needle rollers

10, 10,..., A pair of ring-shaped

ring portions

11, 11, and the pair of rings. A plurality of

column portions

12, 12... For connecting the

portions

11, 11 to each other and a plurality of

pocket portions

13, 13... For accommodating the needle rollers 10 between the adjacent column portions 12. 30.

Each of the plurality of needle rollers 10 in the present embodiment is provided in the pocket portion 13 at substantially equal intervals in the circumferential direction of the pair of ring-shaped

ring portions

11 and 11. Each of the plurality of needle rollers 10 in the present embodiment is provided in the pocket portion 13 at substantially equal intervals in the circumferential direction of the pair of ring-shaped

ring portions

11, 11. It is not limited.

The cage 30 in the present embodiment is formed of a metal material selected from the group consisting of SCM415, S15CK, SPCC, and STKM12C.

In the cage 30, the pair of ring-shaped

ring portions

11, 11 are connected to the longitudinal direction (axial direction) one side and the other side end portions of the plurality of

column portions

12, 12. The cage 30 has a flange 14 that extends radially inward from the connection position with the pillar 12.

Each of the plurality of

column portions

12, 12... Is positioned relatively radially inward in the axial center region and relatively radially outward in the axial end region. It is located between the pair of

column end portions

16 and 16 and between the column center portion 15 and each of the pair of

column end portions

16 and 16 and is connected to the column center portion 15 and each of the pair of

column end portions

16 and 16. A pair of column inclined

portions

17 and 17. In addition, the shape of the column part 12 is not limited to this, It can have a desired shape.

The thickness of the column central portion 15, the column end portion 16 and the column inclined portion 17, the ring portion 11, and the flange portion 14 (hereinafter collectively referred to as “straight portion”) is substantially equal to the column portion 12. Are set equal. In addition, the recessed part 14a is formed in the connection position of the column end part 16 and the collar part 14 so that the collar part 14 may be folded inside.

On the other hand, the boundary portion between the column central portion 15 and the column inclined portion 17 in the column portion 12, the boundary portion between the column end portion 16 and the column inclined portion 17, and the boundary portion between the ring portion 11 and the flange portion 14 (hereinafter, These are collectively referred to as the “boundary portion”) and are thicker than the straight portion.

Thereby, the strength of the boundary portion is relatively improved. As a result, it is possible to effectively prevent the cage 30 from being damaged even if stress during rotation of the bearing is concentrated on the boundary portion.

Further, each of the plurality of

column parts

12, 12,... Is formed with a groove part 18 penetrating substantially in the center in the radial direction. More specifically, the groove portion 18 is formed so as to penetrate substantially the center in the radial direction of the column central portion 15 of each of the plurality of

column portions

12, 12. In the present embodiment, one groove portion 18 penetrating substantially the center in the radial direction of the column portion 12 is formed, but the present invention is not limited to this.

Next, as shown in FIGS. 3 and 4, the needle roller 10 rolls in a state in which the wall surface 12 a of the column portion 12 facing the pocket portion 13, that is, the needle roller 10 is accommodated in the pocket portion 13. On the wall surface 12a of the column 12 facing the surface, at least one roller stopper for preventing the needle roller 10 from dropping off and guide

surfaces

15a, 16a, 17a for guiding the rotation of the needle roller 10 are formed. Has been.

In this embodiment, the

roller stoppers

19 and 20 are formed one by one on each of the pair of

column end portions

16 and 16. And the

roller stoppers

19 and 20 prevent the needle rollers 10 from falling off radially outward.

Moreover, at least one groove portion extending in the radial direction is formed in the substantially central portion of the

roller stopper portions

19 and 20.

More specifically,

groove portions

21 and 22 extending along the radial direction are respectively formed in substantially central portions of the

roller stopper portions

19 and 20. The

grooves

21 and 22 are formed to extend through the

roller stoppers

19 and 20 in the radial direction.

And by the said

groove parts

21 and 22, the

roller stopper parts

19 and 20 are adjacent to the 1st

roller stopper part

19a, 20a adjacent to the axial direction one of the

groove parts

21 and 22, and the axial direction other side of the

groove parts

21 and 22.

Second roller stoppers

19b and 20b.

In the present embodiment, the guide surfaces 15a, 16a, and 17a are provided at the column center portion 15, the pair of column end portions 16, and the pair of column inclined portions 17, respectively.

More specifically, the guide surface 15a is provided in a region adjacent to the groove 18 in the axial direction. The guide surface 16a is provided in the area | region adjacent to the axial direction of the 1st roller stopper part 19 and the 2nd roller stopper part 20 which were formed in each of a pair of

column edge parts

16 and 16. As shown in FIG. The guide surface 17 a is provided over the entire wall surface 12 a of the pair of column inclined

portions

17 and 17. Moreover, the guide surfaces 15a, 16a, and 17a comprise the same plane.

As described above, in the needle roller bearing 50 according to the present embodiment, the portions where the

groove portions

21 and 22 of the first roller stopper 19 and the second roller stopper 20 are provided are located on the needle roller 10. The lubricant on the rolling surface of the needle roller 10 is not scraped by friction with the

roller stoppers

19 and 20 of the retainer 30 without contacting the rolling surface.

Further, since the lubricating oil can be stored in the

groove portions

21 and 22, the lubricating oil stored in the in-

use groove portions

21 and 22 lubricates the rolling surface of the needle roller 10, so that the needle roller 10 rolls. It is possible to ensure the oil film thickness at the contact surface with the moving surface and the

stop portions

19 and 20. For this reason, it becomes difficult for the metal parts of the rolling surface of the needle roller 10 and the raceway surface to directly contact each other, and damage such as peeling is less likely to occur.

Further, the roller stopper can be formed on at least one of the column central portion 15, the pair of

column end portions

16 and 16, and the pair of column inclined

portions

17 and 17. Therefore, since the area where the lubricating oil is stored in the groove of the roller stopper increases, the lubricating oil stored in the groove during use lubricates the rolling surface, so that the rolling surface of the needle roller 10 and the stopper The oil film thickness at the contact portion can be ensured.

Further, the first roller stopper 19 and the second roller stopper 20 ensure the contact area between the rolling surface of the needle roller 10 and the

stoppers

19 and 20, and the rolling surface of the needle roller 10. However, the oil film thickness at the contact portion with the stopper can be ensured.

Further, the lubricating oil flows over the rolling surface and the raceway surface of the needle roller 10 through the

groove portions

21 and 22 that are penetrated while ensuring the amount of lubricating oil on the rolling surface of the needle roller 10. Therefore, the oil film thickness at the contact surface with the rolling surface of the needle roller 10 and the

stoppers

19 and 20 can be further ensured.

Hereinafter, a needle roller bearing according to a second embodiment of the present invention will be described with reference to FIG.
(Second embodiment)
In the needle roller bearing according to this embodiment, the configuration of the first embodiment is the same as that of the first embodiment except that at least one groove of the roller stopper in the first embodiment is not penetrated in the radial direction. . Therefore, about the structure similar to 1st embodiment, the same code | symbol is attached | subjected and the description is not repeated.

In this embodiment, as shown in FIG. 5, the

groove portions

31 and 32 in the

roller stoppers

19 and 20 are formed so as not to penetrate the

roller stoppers

19 and 20 in the radial direction.

The needle roller bearing 50 according to the present embodiment is the same as the needle roller bearing according to the first embodiment by the

non-penetrating groove portions

31 and 32 provided in the

roller stoppers

19 and 20 of the cage 30. A certain degree of effect can be achieved.

The needle roller bearing of the present invention is not limited to the first and second embodiments described above, and can of course be changed as appropriate without departing from the gist of the present invention.

In the first and second embodiments, the cage is formed of a metal material selected from the group consisting of SCM415, S15CK, SPCC, STKM12C), but is not limited thereto. The cage may be formed of a polyamide resin selected from the group consisting of polyamide 46 and polyamide 66.

In the first and second embodiments, the roller stopper is formed on the pair of column inclined portions, but is not limited thereto. For example, the roller stopper is a column central portion, You may make it form in at least one of a pair of pillar edge part and a pair of pillar inclination part.

In the first and second embodiments, at least one groove is formed in the central portion in the radial direction of the roller stopper, but the present invention is not limited to this. For example, the diameter of the roller stopper A plurality of grooves may be formed in the approximate center of the direction.

In this case, the number of the roller stopper portions formed by the groove portions is, for example, in the case of two groove portions, according to the number of groove portions, the first roller stopper portion formed between the two groove portions and one groove portion. Three roller stoppers are formed, a second roller stopper formed on the outer side in the radial direction and a third roller stopper formed on the outer side in the radial direction of the other groove.

In other words, the plurality of groove portions make the roller stopper portion a plurality of roller stopper portions formed between adjacent groove portions, a roller stopper portion formed on the radially outer side of the groove portion on one end side in the radial direction, and a radial direction And a roller stopper formed on the radially outer side of the groove on the other end side.

In short, any configuration may be used as long as it can secure the contact area with the needle roller while securing the amount of lubricating oil in the roller stopper and preventing oil shortage (securing the amount of oil). The same applies to the case where the through groove or the non-through groove is formed at the substantially center in the radial direction of the roller stopper.

In the first and second embodiments, as shown in FIG. 6, a through groove 33 along the axial direction may be formed in the approximate center of the end surface 13 a of the pocket portion 13 of the cage 30. The number of through grooves 33 is not limited.

Alternatively, in the first and second embodiments, as shown in FIG. 7, through grooves 43 along the axial direction may be formed at both ends of the pocket portion 13 end surface 13 a of the cage 30. The number of through grooves 43 is not limited.

In any case, the lubricating oil can also flow through the through groove 33 or the through groove 43 provided in the axial direction of the pocket 13 end surface 13a of the cage 30, and the lubricating oil is not only in the radial direction, The entire needle roller bearing 50 can be extended in the axial direction through the through groove 33 or the through groove 43. For this reason, the decrease in the oil film thickness in the needle roller bearing 50 can be suppressed, and the oil film thickness can be further ensured.

And the metal part of the rolling surface of a needle roller 10 and a raceway surface contacts directly by maintaining the oil film thickness in the rolling surface of a needle roller 10, a raceway surface, and the needle roller bearing 50. It becomes difficult and generation | occurrence | production of peeling etc. can be suppressed further.

The needle roller bearing of the present invention is effectively used when rotatably supporting a planetary gear shaft of a transmission for an automobile, an idler of a transmission, a connecting rod of an engine, and the like.

10 needle rollers, 11 pairs of ring parts, 12 pillars, 12a wall surface, 13 pockets, 13a end face, 14 collar, 15 pillar center, 16 pairs of pillar ends, 17 pairs Column inclined part, 15a, 16a, 17a guide surface, 18 groove part, 19, 20 roller stopper, 21, 22 groove part, 30 cage, 31, 32 groove part, 33, 43 through groove, 50 needle roller bearing.

Claims

A plurality of needle rollers;
A pair of ring-shaped ring portions, a plurality of column portions interconnecting the pair of ring portions, and a cage having a plurality of pocket portions for accommodating the needle rollers between the adjacent column portions; A needle roller bearing comprising:
At least one roller stopper is formed on the wall surface of the pillar,
A needle roller bearing, wherein at least one groove extending along the radial direction is formed in a central portion of the at least one roller stopper.
The column portion is a column center portion that is relatively radially inward in the axial center region, a pair of column end portions that are relatively radially outward in the axial end region, and the column center portion The needle roller bearing according to claim 1, further comprising a pair of column inclined portions positioned between each of the pair of column end portions and facing a rolling surface of the plurality of needle rollers.
The said roller stop part contains the 1st roller stop part adjacent to the axial direction one side of the said groove part, and the 2nd roller stop part adjacent to the axial direction other side of the said groove part. Needle roller bearing.
The needle roller bearing according to claim 1, wherein the at least one groove portion is formed so as to extend through the roller stopper portion in a radial direction.
The needle roller bearing according to claim 1, wherein the at least one groove portion does not penetrate the roller stopper in a radial direction.
The needle roller bearing according to any one of claims 1 to 5, wherein a through groove along a radial direction is formed at a substantially center of the end surface of the pocket portion of the cage.
The needle roller bearing according to any one of claims 1 to 6, wherein through grooves along the radial direction are formed at both ends of the end surface of the pocket portion of the cage.
The needle roller bearing according to any one of claims 1 to 7, wherein the cage is made of a metal material selected from the group consisting of SCM415, S15CK, SPCC, and STKM12C.
The needle roller bearing according to any one of claims 1 to 7, wherein the cage is made of a polyamide resin selected from the group consisting of polyamide 46 and polyamide 66.