JP2003049844A - Thrust roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust roller bearing enhancing the strength of presser tabs, capable of securing an equal or more throughput of lubricating oil to that of the conventional type, suppressing chips of the presser tabs, and preventing seizure etc. SOLUTION: The presser tabs 15 are formed over a prescribed length in the circumferential direction of a guide part 14 and trapezoidal lubricating oil through grooves 16 are provided between mutually adjoining presser tabs 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust roller bearing such as a thrust needle roller bearing.

[0002]

2. Description of the Related Art As a roller bearing using rollers such as needle rollers as rolling elements, there are thrust roller bearings shown in FIGS. This thrust roller bearing includes a thrust race 11, rollers 12, and a cage 13, and a cylindrical guide portion 14 is integrally formed on the outer peripheral edge portion of the thrust trace 11. The guide portion 14 is for guiding the retainer 13 in the circumferential direction of the thrust race 11, and a pressing tab 15 is provided at a plurality of positions at the tip of the guide portion 14. The pressing tab 15 is for preventing the retainer 13 from being separated from the thrust trace 11, and is bent toward the inner diameter side of the thrust trace 11. Therefore, in such a thrust roller bearing, the pressing tab 15 is pushed to the inner diameter side of the thrust trace 11,
In this state, the cage 13 is attached to the raceway surface 1 of the thrust trace 11.
It is assembled by pushing it into the thrust race 11 from the 1a side.

[0003]

However, in the thrust roller bearing as described above, since the holding width of the holding tab 15 is small, if the tab 15 wears due to the contact between the tab 15 and the cage 13 during use, In the worst case, there was a problem that the tab 15 was chipped and the cage 13 and the thrust trace 11 were broken.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a thrust roller bearing capable of suppressing the occurrence of chipping of the pressing tab. .

[0005]

In order to achieve the above object, the invention of claim 1 has a cylindrical guide portion at the outer peripheral edge portion or the inner peripheral edge portion of the thrust trace, and the tip end portion of this guide portion. In a thrust roller bearing assembled by a plurality of pressing tabs formed by bending, the pressing tabs are formed over a predetermined length in the circumferential direction of the guide portion, and trapezoidal shapes are formed between the pressing tabs adjacent to each other. It is characterized in that a lubricating oil flow-through groove is provided.

According to a second aspect of the present invention, in the thrust roller bearing of the first aspect, the pressing tab is provided over the entire circumference of the guide portion.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of a thrust roller bearing according to a first embodiment of the present invention, and FIG. 2 is a II-II of FIG.
It is arrow sectional drawing which follows the line. As shown in FIGS. 1 and 2, a thrust roller bearing 10 according to a first embodiment of the present invention includes a thrust trace 11, rollers 12, and a cage 1.
3, the cage 13 is formed by stacking a pair of annular metal members 13a and 13b press-molded into a predetermined shape.

A cylindrical guide portion 14 is integrally formed on the outer peripheral portion of the thrust trace 11. This guide 1
Reference numeral 4 is for guiding the cage 13 in the circumferential direction of the thrust race 11, and the pressing tab 1 is provided at the tip of the guide portion 14.
5 and the lubricating oil flow-through groove 16 are provided at a plurality of locations. The retainer tab 15 attaches the retainer 13 to the thrust trace 11
It is for preventing it from being separated from, and is bent to the inner diameter side of the thrust trace 11. The pressing tab 15 is formed over a predetermined length in the circumferential direction of the thrust trace 11.

The lubricating oil flow-through groove 16 is provided to allow the lubricating oil to flow therethrough, and is formed by cutting the tip of the guide portion 14 into a trapezoidal shape. As described above, by providing a plurality of pressing tabs 15 that are pressed and bent on the inner diameter side of the thrust trace 11 over a predetermined length at the tip of the guide portion 14, the strength of the pressing tab 15 increases. It is possible to prevent occurrence of chipping of the tab 15 during use. Also,
Since the contact area between the retainer 13 and the pressing tab 15 increases, the assembling force between the retainer 15 and the thrust trace 11 increases, and the retainer 13 is less likely to come off than the thrust trace 11.

Further, in the above-described embodiment, since the lubricating oil flow-through groove 16 is formed in a trapezoidal shape, the amount of lubricating oil that is equal to or greater than that of the conventional arc-shaped lubricating oil flow-through groove flows, It is possible to prevent the occurrence of image sticking. Next, a second embodiment of the present invention will be described.
3 is a plan view of a thrust roller bearing according to a second embodiment of the present invention, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. As shown in FIGS. 3 and 4, a thrust roller bearing 20 according to a second embodiment of the present invention includes thrust traces 11, rollers 12 and a cage 13, and the cage 13 has a predetermined shape. It is configured by stacking a pair of press-molded annular metal members 13a and 13b.

A cylindrical guide portion 14 is integrally formed on the inner peripheral edge of the thrust trace 11. This guide 1
Reference numeral 4 is for guiding the cage 13 in the circumferential direction of the thrust race 11, and the pressing tab 1 is provided at the tip of the guide portion 14.
5 and the lubricating oil flow-through groove 16 are provided at a plurality of locations. The retainer tab 15 attaches the retainer 13 to the thrust trace 11
It is for preventing it from being separated from, and is pushed and bent to the outer diameter side of the thrust trace 11. The pressing tab 15 is formed over a predetermined length in the circumferential direction of the thrust trace 11.

The lubricating oil flow-through groove 16 is provided to allow the lubricating oil to flow therethrough, and is formed by cutting the tip of the guide portion 14 into a trapezoidal shape. In the above-mentioned second embodiment, the strength of the pressing tab 15 is improved by providing a plurality of pressing tabs 15 pressed and bent on the outer diameter side of the thrust trace 11 over a predetermined length at the tip of the guide portion 14. Therefore, it is possible to prevent the pressing tab 15 from being chipped. Further, the cage 13 is less likely to come off than the thrust trace 11.

Further, in the above-described embodiment, since the lubricating oil flow-through groove 16 is formed in a trapezoidal shape, the amount of lubricating oil that is equal to or greater than that of the conventional arc-shaped lubricating oil flow-through groove flows. It is possible to prevent the occurrence of image sticking. In the above-described first embodiment, the thrust trace 11
Although the pressing tabs 15 are provided at a plurality of locations on the tip of the guide portion 14 formed on the outer peripheral edge of the sheet, the third tab shown in FIGS.
The pressing tab 15 may be provided on the entire circumference of the guide portion 14 as in the above embodiment. With such a configuration,
Further, the assembling force between the cage and the thrust trace 11 is increased, and the cage is less likely to come off than the thrust trace 11.

Further, in the above-described second embodiment, the pressing tabs 15 are provided at a plurality of positions on the tip of the guide portion 14 formed on the inner peripheral edge of the thrust trace 11, but in FIGS. As in the fourth embodiment shown, the holding tab 15
May be provided on the entire circumference of the guide portion 14. With such a configuration, the assembling force between the cage and the thrust trace 11 is further increased, and the cage is less likely to come off than the thrust trace 11.

FIG. 9 shows an axial sectional view of a thrust roller bearing according to a fifth embodiment of the present invention, and FIG. 10 shows a view of the thrust roller bearing as seen from the direction of arrow X in FIG. As shown in FIGS. 9 and 10, the thrust roller bearing 20 according to the fifth embodiment has two thrust races 21, 21 having annular raceway surfaces 21 a, 22 a facing each other.
22 and the orbital surface 21 of these thrust traces 21 and 22.
A thrust roller is provided with a plurality of rollers 23 provided between a and 22b, and a cage 24 that holds these rollers 23 in the circumferential direction of the thrust traces 21 and 22 so as to be rotatable and at equal intervals. Outer peripheral edge of race 21 and thrust race 2
A retainer 24 is attached to the thrust traces 21,
Cylindrical guide portions 25 and 26 for guiding the circumferential direction of 22 extend from the thrust traces 21 and 22.

The guide portions 25 and 26 are the thrust traces 21,
22 is formed integrally with the guide portions 25 and 26, and trapezoidal lubricating oil flow-through grooves 27 are formed at a plurality of positions at the tips of the guide portions 25 and 26, and pressing tabs 28 and 29 are provided at the lubricating oil flow-through grooves 2 as well.
It is provided between 7 over a predetermined length. These pressing tabs 28 and 29 are for integrating the two retainer forming members 30 and 31 forming the retainer 24. The pressing tab 28 is located on the inner diameter side of the thrust trace 21. Are respectively pushed and bent on the outer diameter side of the thrust trace 22.

As described above, a plurality of pressing tabs 28, 29 are provided at the tips of the guide portions 25, 26, and the thrust traces 21, 29 are provided.
By providing the pressing tabs 28, 29 in the circumferential direction for a predetermined length, the strength of the pressing tabs 28, 29 is increased, so that it is possible to prevent the tabs 28, 29 from being chipped during use. Further, since the contact area between the retainer 24 and the pressing tabs 28 and 29 increases, the retainer 24 and the thrust trace 2
The assembling force with respect to 1, 2 is increased, and the retainer 24 is less likely to come off than the thrust traces 21, 22.

Further, since the lubricating oil flow-through groove 27 is formed into a trapezoidal shape, the amount of lubricating oil that is equal to or greater than that of the conventional arc-shaped lubricating oil flow-through groove flows, so that seizure or the like occurs. Can be prevented.

[0019]

As described above, according to the present invention,
Since the strength of the pressing tab is increased and the amount of lubricating oil that is equal to or greater than that of the conventional shape can be secured, it is possible to suppress the occurrence of chipping of the pressing tab and prevent the occurrence of seizure or the like. A thrust roller bearing can be provided.

[Brief description of drawings]

FIG. 1 is a plan view of a thrust roller bearing according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a plan view of a thrust roller bearing according to a second embodiment of the present invention.

4 is a sectional view taken along the line IV-IV of FIG.

FIG. 5 is a plan view of a thrust trace for explaining a third embodiment of the present invention.

FIG. 6 is an axial cross-sectional view of the thrust trace shown in FIG.

FIG. 7 is a plan view of a thrust trace for explaining a fourth embodiment of the present invention.

8 is an axial cross-sectional view of the thrust trace shown in FIG.

FIG. 9 is an axial sectional view of a thrust roller bearing according to a fifth embodiment of the present invention.

10 is a view of the thrust roller bearing seen from the direction of arrow X in FIG.

FIG. 11 is a plan view of a conventional thrust roller bearing.

12 is a cross-sectional view showing a part of the thrust roller bearing shown in FIG.

[Explanation of symbols]

11,2,22 Thrust Race Around 12,23 13,24 cage 14,25,26 Guide 15, 28, 29 Pressing tab 16,27 Lubricating oil flow-through groove

Claims (2)

[Claims] 1. A thrust roller bearing having a cylindrical guide portion at an outer peripheral edge portion or an inner peripheral edge portion of a thrust race, and assembled by a plurality of pressing tabs formed by bending a tip portion of the guide portion, A thrust roller bearing, wherein the pressing tabs are formed over a predetermined length in the circumferential direction of the guide portion, and trapezoidal lubricating oil flow grooves are provided between the pressing tabs adjacent to each other. 2. The thrust roller bearing according to claim 1, wherein the pressing tab is provided over the entire circumference of the guide portion.