JPH10196659A - Roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a roller from coming off from a retainer and prevent an oil film of the roller from breaking off by arranging roller stopper pawls, which are engaged with an expanded end face part in the roller, on the axial directional both end faces inside a pocket of the retainer. SOLUTION: A bearing is constructed of a cylindrical retainer 1, in which pockets 2 housing a roller 3 are formed in plural parts in the circumference direction, and a roller 3 whose axial direction end face aprts 3a are formed into an expanded shapes. In the end faces of the axial direction both ends inside a pocket 2, roller stopper pawls 4a, 4b are arranged. The pawls 4a are arranged in two positions, the front and rear positions, in the circumference direction on the outside diameter side from a shaft center O of the roller 3 while putting the shaft center O between them, while the pawls 4b are arranged in two positions, the front and rear positions, in the circumference direction on the inside diameter side from the shaft center O while putting the shaft center O between then. In this way, the roller 3 is prevented from coming off in the retainer 1 diameter direction from the pocket 2, and the pawls 4a, 4b are not brought into contact with a rolling face 3b in the roller 3, so that an oil film of the roller 3 can be prevented from breaking off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing used in various equipment, particularly in a place where high-speed rotation is required under lean lubrication or where it is difficult to form an oil film, such as a bearing for an engine connecting rod large end. .

[0002]

2. Description of the Related Art Conventionally, as a roller bearing of this type, as shown in FIGS. 6 and 7, a needle-shaped cage with rollers 30 and cages 31A, 31B, 31C is provided. Rollers are used. Cage 31A shown in FIG.
Is a retainer of a type in which the column portion 33 between the pockets 32 is bent to form an M-shaped cross section as a whole, and the roller 30 is prevented from coming off by a roller stopper claw 34a on the inner diameter side formed in the center.
And roller stopper claws 34b on the outer diameter side formed near both ends. However, in the case of the retainer 31A, since the roller stopper claws 34a and 34b are in contact with the rolling surface 30a of the roller 30, the oil film of the roller 30 is removed at the claw contact portion A of the roller rolling surface 30a shown in FIG. There is a problem that the roller pawls 34a and 34b are cut off, which causes flaking and peaking.

[0003] A retainer 31B shown in Fig. 7 (A) is a retainer of a type in which a pillar portion 33 between pockets 32 is not bent, and is a roller dropping type having no roller stopper claws. This cage 3
In the case of 1B, since the oil film of the roller 30 is not cut, there is no problem as in the retainer 31A of FIG. 6, but since it is a roller dropping type, it is difficult to handle and the assembly is troublesome.

[0004] A retainer 31C shown in FIG.
Although the retainer has the same overall shape as that of (A), in this example, roller stopper claws 35a and 35b are provided, and a problem that the oil film on the roller rolling surface 30a is cut off as in the example of FIG. There is.

[0005] It is an object of the present invention to solve such a problem and to provide a roller bearing having a structure in which the rollers do not fall out of the cage and in which the oil film of the rollers does not break.

[0006]

The roller bearing according to the present invention comprises:
A pocket for accommodating the rollers is provided with a cylindrical retainer formed at a plurality of locations in the circumferential direction, and rollers accommodated in the respective pockets. A roller stopper claw is provided for engaging the end face portion having the bulge of the roller to prevent the roller from falling out of the pocket in the radial direction of the retainer. According to this configuration, the roller stopper claw of the retainer does not contact the rolling surface of the roller, and engages with the bulged end surface portion. Cutting of the oil film on the surface can be reduced or eliminated. Since the load applied to the roller bearing mainly acts on the outer diameter surface which is the rolling surface of the roller, even if the roller stopper claw is engaged with the end surface of the roller,
Does not hinder roller rotation. In the roller bearing having the above configuration, the bulged end face of the roller may have a flat surface having a chamfered portion on an outer peripheral edge, or may have a shape in which the entire end surface is a spherical curved surface. In this case, the roller pawls are provided on both sides of the end surface in the pocket. By providing the roller stopper claws on both sides as described above, the roller can be reliably prevented from coming off from the roller end face having the above-described shape. Further, the end face portion of the roller having the bulge may have a hemispherical curved surface as a whole. In this case, the roller stopper claw is formed to extend over the entire width of the end face in the pocket. By providing the roller stopper claws in this way, reliable engagement with the hemispherical roller end face can be performed.

[0007]

FIG. 1 shows a first embodiment of the present invention.
A description will be given based on (A) to (D). The roller bearing according to this embodiment is an example in which the present invention is applied to a needle roller bearing having no inner and outer rings (that is, a “needle roller with a retainer”). And a roller 3 accommodated in each of the pockets 2. Axial end face 3a of roller 3
Has a bulging shape. More specifically, the end surface portion 3a is formed as a slightly spherical curved surface whose entire end surface is swollen. Roller stopper claws 4a, which engage with end faces 3a of the rollers 3 to prevent the rollers 3 from falling out of the pockets 2 in the radial direction of the cage 1, are provided on end faces at both ends in the axial direction in the pockets 2 of the cage 1. 4b is provided. The roller stopper claw 4a is a claw provided at a position on the outer diameter side with respect to the axis O of the roller 3 as shown in FIG.
Are arranged at two places in the circumferential direction with respect to the axis O. The other roller stopper claw 4b is a claw provided at a position on the inner diameter side with respect to the axis O of the roller 3 as shown in FIG. 1 (B). , And are disposed at two locations in the circumferential direction. That is, both the inner and outer diameter roller stopper claws 4a and 4b are provided on both sides of the pocket end surface. In addition, each roller stopper claw 4
a, 4b are provided at positions slightly away from both side edges of the pocket end surface. The retainer 1 is manufactured by pressing or turning from a steel plate or a pipe material.
The roller stopper claws 4a and 4b are formed by cutting or plastic working. That is, the roller stopper claws 4a,
4b may be a nail made by cutting, or a protrusion formed by caulking the pocket edge of the cage 1. Note that the cage 1 may be a resin molded product.

According to the roller bearing having this configuration, the outer and inner diameter roller stopper claws 4 a and 4 b engage with the bulging end face portion 3 a of the roller 3 at both ends in the pocket 2 of the cage 1. However, the rollers 3 are prevented from coming off the pockets 2 in the radial direction of the cage 1. In this case, the roller stopper claws 4a,
4b does not come into contact with the rolling surface 3b of the roller 3;
Can be prevented from being cut by the roller stopper claws 4a and 4b, and the occurrence of flaking and peeling can be eliminated.
In addition, since the roller 3 is a non-falling type bearing, handling is easy.

FIGS. 2A to 2D show a roller bearing according to a second embodiment. In this embodiment, FIGS. 2 (B) to 2 (D)
As shown in (1), outer and inner diameter roller stopper claws 4a and 4b extending over the entire width thereof are provided on the end face in the pocket 2 of the cage 1. As shown in FIGS. 2 (A) and 2 (C), the roller 3 has a bulged end surface portion 3a whose entire end surface is a hemispherical curved surface.

When the end face 3a of the roller 3 has a hemispherical shape as in this example, the amount of movement of the roller 3 in the radial direction of the cage is large, which is preferable in terms of resistance to rotation. For such a hemispherical end face portion 3a, as shown in this example, the anti-rolling claw 4 is provided over the entire width of the end face in the pocket 2.
By providing a and 4b, the roller 3 is reliably prevented from coming off. Other configurations and operations are the same as those of the previous embodiment.

FIGS. 3A to 3D show a roller bearing according to a third embodiment. In this embodiment, FIGS. 3 (B) to 3 (D)
As shown in (1), outer and inner diameter roller stopper claws 4a and 4b are provided on both sides of the end face in the pocket 2 of the cage 1. Roller pawls 4a and 4b in this example are:
It is provided on the end surface in the pocket 2 without leaving from the side edge. The roller 3 has an end face 3a having the bulge.
As shown in FIGS. 3A and 3C, a flat surface having a chamfer on the outer peripheral edge is formed. When the end surface of the roller 3 is a flat surface with a chamfered portion, the roller stopper claws 4a,
4b reduces the amount by which the roller 3 is allowed to move in the radial direction of the cage, which is preferable in the case of the cage 1 for rolling element guide.

FIG. 4 shows a roller bearing according to a fourth embodiment.
In this embodiment, as in the case of the third embodiment (FIG. 3), outer-diameter and inner-diameter roller stopper claws 4a and 4b are provided on both sides of the end surface in the pocket 2 of the cage 1. In addition, the end face portion 3a of the roller 3 has a hemispherical curved surface as a whole like the second embodiment (FIG. 2). The combination of the shape and arrangement of the roller stopper claws 4a and 4b and the end face 3a of the roller 3 in each of the examples of FIGS. 1 to 4 can be any combination other than the illustrated example.

FIGS. 5A and 5B show a roller bearing according to a fifth embodiment. The roller bearing according to this embodiment includes an outer ring 5 in addition to the cage 1 and the rollers 3 in the first embodiment (FIG. 1).
Further, among the roller stopper claws 4a and 4b in the pocket 2 of the retainer 1, the roller stopper claws 4a on the outer diameter side are omitted. In this case, since the outer ring 5 is provided, the roller 3 is prevented from falling out of the cage 1 to the outer diameter side.
Will block. Other configurations and actions are the first
This is the same as the embodiment (FIG. 1).

In each of the above embodiments, the retainer 1 is formed as an integral cylindrical member. However, the retainer 1 is not limited to this, and may be a split cylinder type divided at one or more locations in the circumferential direction. There may be.

[0015]

According to the roller bearing of the present invention, a roller stopper claw is provided on the end face in the pocket of the cage to engage with the end face having the bulge of the roller to prevent the roller from coming off. The oil film is less likely to be cut by the retainer pawls of the retainer, or can be eliminated altogether.

[Brief description of the drawings]

FIG. 1A is a partially omitted cross-sectional view of a roller bearing according to a first embodiment of the present invention, FIG. 1B is a cross-sectional view taken along a line II of FIG. 1, and FIG. FIG. 2D is a partially omitted front view of the cage of the roller bearing, in which a pocket is partially omitted.

FIG. 2A is a partially omitted sectional view of a roller bearing according to a second embodiment of the present invention, FIG. 2B is a sectional view taken along the line II-II, and FIG. FIG. 2D is a partially omitted front view of the cage of the roller bearing, in which a pocket is partially omitted.

FIG. 3A is a partially omitted sectional view of a roller bearing according to a third embodiment of the present invention, FIG. 3B is a sectional view taken along line III-III of FIG. 3, and FIG. FIG. 2D is a partially omitted front view of the cage of the roller bearing, in which a pocket is partially omitted.

FIG. 4 is a sectional view of a roller bearing according to a fourth embodiment of the present invention.

FIG. 5A is a partially omitted sectional view of a roller bearing according to a fifth embodiment of the present invention, and FIG. 5B is a sectional view taken along line VV of FIG.

FIG. 6A is a cross-sectional view of a conventional roller bearing, and FIG. 6B is an explanatory diagram showing an oil film cut in the roller bearing.

FIG. 7A is a sectional view of another conventional roller bearing,
(B) is a partially omitted cross-sectional view of another conventional roller bearing, (C) is a partially omitted front view of the roller bearing viewed from the outer diameter side, and (D) and (E) are oil films in the roller roller bearing. It is explanatory drawing which shows a cut.

[Description of Signs] 1 ... Cage 2 ... Pocket 3 ... Roller 3a ... End face 4a ... Outer diameter side roller stopper claw 4b ... Inner side roller stopper claw

Claims (3)

[Claims] 1. An end face at both ends in the axial direction in a pocket of the cage, comprising: a cylindrical retainer in which pockets for accommodating rollers are formed at a plurality of positions in a circumferential direction; and rollers accommodated in the pockets. A roller bearing provided with a roller stopper claw which engages with a bulged end face of the roller to prevent the roller from falling out of the pocket in the radial direction of the retainer. 2. The swelling end surface of the roller is a flat surface having a chamfered portion on an outer peripheral edge, or the entire end surface is a spherical curved surface, and the roller stopper claw is provided in the pocket. 2. The roller bearing according to claim 1, wherein the roller bearing is provided on both sides of the inner end face. 3. The end face portion having the bulge of the roller is formed so that the entire end face is a hemispherical curved surface, and the roller stopper claw is formed to extend over the entire width of the end face in the pocket. The roller bearing according to claim 1, wherein