JP2562728Y2 - Shell type roller bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-roller type shell roller bearing, and more particularly to an improvement in a holding structure between outer rings.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, an outer ring of a shell roller bearing of this type has a flange 2 which is bent radially inward at both ends of a thin steel plate 21 formed in a cylindrical shape.
2 and 23 are provided, and at the end of each of the flanges 22 and 23,
The holding projections 24 and 25 are formed to be bent inward in the axial direction.
By engaging the rollers 7 and 28, the rollers 26 are
Holding inside.

Incidentally, rollers 26 are provided inside the outer race 20.
When most of the rollers are assembled, the rollers can be easily assembled by tilting the rollers with respect to the axis of the outer ring 20. However, the last few rollers are one-sided as shown by a chain line in FIG. It is necessary to forcibly press the roller 26 into the outer race 20 and insert the roller 26 into the outer race 20 from the state where the end surface 27 and the holding projection 24 are in contact. For this reason, at the time of press-fitting, the end face of the roller is twisted between the outer ring and the surface thereof, and there is a possibility that those surfaces are damaged or the holding projections are cracked.

To cope with such a problem, Japanese Unexamined Utility Model Publication No. Sho 63-99026 discloses a roller insertion groove 29 provided in a holding projection 25 of an outer ring 26 as shown in FIG. There has been proposed a bearing which incorporates a bearing.

[0005] However, in the structure in which a part of the holding projection 25 is cut out by the roller insertion groove 29 as described above, if any force is applied to the assembled roller, the roller may fall out of the insertion groove 29. .

Further, since a notch step for forming the roller insertion groove 29 must be added during the manufacturing process of the outer race 20, there is also a problem that the number of steps increases and the manufacturing cost increases.

Accordingly, an object of the present invention is to provide a shell-type roller bearing that can securely incorporate rollers without damaging the rollers and the outer ring with a simple structure and that does not fall off the rollers.

[0008]

In order to solve the above-mentioned problems, the present invention is to form the both end faces of the roller in a tapered shape,
Among the holding projections formed at both ends of the outer ring, the tip of one of the holding projections is chamfered so that the diameter increases radially inward.

[0009]

In the above structure, the tapered end surface of the roller is brought into contact with the chamfered surface of one of the holding projections, and the roller is assembled into the outer ring while the holding projection is pushed and expanded at the roller end surface.

In this structure, since the end face of the roller and the holding projection are deformed while slidingly contacting each other through chamfering,
No twisting occurs, and no scratches occur on the surface of the rollers and outer ring.

Further, since the holding projection has no notch, the roller does not fall off.

[0012]

1 and 2 show an embodiment according to the present invention. The outer race 1 is formed by forming a thin steel plate 2 into a cylindrical shape, and flanges 3, 4 bent radially inward at both ends of the steel plate 2.
And holding projections 5 and 6 that bend inward in the axial direction are provided at the ends of the flanges 3 and 4.

The shell-shaped outer ring 1 is formed by a plurality of plastic working steps such as press working, punching, and cutting.

When the forming of the outer race 1 is completed, chamfering is performed on the peripheral edge of the tip of one of the holding projections 5 to form an inclined surface 7 whose diameter increases inward in the radial direction as shown in FIG.

On the other hand, the tip of the other holding projection 6 is not subjected to chamfering, but is left as it is by press molding, and is formed into a relatively sharp shape. This is to secure the axial distance L between the two holding projections 5 and 6 and not to reduce the holding force of the rollers 8 by the two holding projections 5 and 6, whereby the tips of the left and right holding projections 5 and 6 become , Formed in an asymmetric shape.

The roller 8 accommodated in the outer race 1 is provided with a cylindrical rolling surface 9 at the center, and the both end surfaces 10 and 11 are tapered so that the diameter thereof is continuously tapered from the surface of the rolling surface 9. It is formed in a shape.

The axial distance L between the holding projections 5 and 6 of the outer race 1 is smaller than the entire length of the roller 8 and larger than the length of the rolling surface 9 of the roller 8. Face 1
0 and 11 are set so as to engage with the holding projections 5 and 6.

The bearing of the embodiment has the structure as described above.
When assembling the last several rollers 8 into the outer ring 1, as shown in FIG. 1, one end face 11 of the roller 8 is fitted into the inside of the holding projection 6 which is not chamfered. The other end face 10 is inclined by the chamfering of the tip of the holding projection 5.
Contact. From this state, the rollers 8 are pressed radially outward, and the holding protrusions 5 are pushed and expanded at the end faces 10 of the rollers, so that the rollers 8 are assembled into the outer race 1.

In this assembling operation, the holding projection 5 is deformed while the end face 10 of the roller 8 and the tip of the holding projection 5 are in contact with each other in a contact state, so that no twisting force acts on the holding projection 5 and the roller 8 and the roller 8 and the outer ring 1 are free from scratches and cracks.

Further, in the above structure, since one of the holding projections 5 is chamfered, the axial distance L between the two holding projections 5 and 6 is fixed to a certain size as compared with the conventional outer ring formed only by plastic working. It is easier to get into tolerance. Therefore, the axial distance L can be set with high dimensional accuracy, and a stable holding force of the rollers 8 can be obtained.

FIG. 3 shows another embodiment, in which one of the holding projections 5 is chamfered on an arcuate surface 12. The chamfer may be formed by combining a plurality of the inclined surfaces 7 and the arc surfaces 12 described above, or by combining an inclined surface and an arc surface.

[0022]

[Effect] As described above, according to the present invention, the holding projection of the outer ring is deformed through the end face and the surface contact of the roller, and the deformation is not twisted. Can be reliably incorporated.

Further, since notches such as roller insertion grooves are not provided in the holding projections, the rollers do not fall off from the outer ring.
Further, there is an advantage that the bearing can be manufactured at a low cost because notch processing is not required.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment.

FIG. 2 is an enlarged sectional view showing a main part of the above.

FIG. 3 is a sectional view showing another embodiment.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Thin steel plate 3, 4 Flange 5, 6 Retaining projection 7 Inclined surface 8 Roller 9 Rolling surface 10, 11 End surface 12 Arc surface

Claims (1)

(57) [Scope of request for utility model registration] An outer ring and a number of rollers housed in the outer ring. The outer ring is provided with flanges that are bent radially inward at both ends of a steel plate formed into a cylindrical shape. In the shell-type roller bearing in which the holding projections are formed by providing the holding projections that are bent inward in the axial direction at the tips, and the both end faces of the roller housed inside the outer ring are held by the two holding projections, the both end faces of the rollers are tapered. A shell-type roller bearing formed in a shape, and having a chamfer that expands radially inward at a tip end of one of the holding projections of the outer ring.