JPH04231722A - Bearing ring for shell type needle bearing - Google Patents

Abstract

PURPOSE:To provide a bearing ring for a long life bearing retaining lubricating characteristic by making the properties of both surfaces of a thin plate material different from each other, making the rolling surface side flat and using a pivot contained in the flat surface as an oil retainer. CONSTITUTION:One surface 1a of a thin plate material 1X is dull finished while the other surface 1b is pivot finished. The thin plate material is placed on a die B so that time dull finished surface is made to be the outer diameter side while the pivot finished surface 1b is made to be the inner diameter side. An outer ring is formed by deep drawing with a punch A and mechanically drilling a hole 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raceway for a shell-shaped needle bearing, which is made of a thin plate material and has a rolling surface and a fitting surface that have different properties.

0002

2. Description of the Related Art The outer ring of a shell-type needle bearing is formed by drawing a thin steel plate using a press. A large number of needle rollers held by a cage are provided inside the outer ring, and these rollers are rolled in direct contact with the shaft and the inner circumferential surface of the outer ring. Particularly when an inner ring is used, the inner ring is set inside the bearing, and generally this inner ring is also formed as a shell raceway.

0003

[Problems to be Solved by the Invention] By the way, when forming the outer ring and inner ring of the above-mentioned shell type needle bearing, the material conventionally used is a dull material (with large surface protrusions) whose surface roughness is 3 to 8S on both the front and back surfaces. A bright material (polishing material) of 0.4 to 3S is used, and in particular, bright material has been widely used to increase the surface roughness as much as possible.

[0004] For this reason, during the drawing process (including ironing process), scratches are generated on the fitting surface side and wrinkles are generated on the rolling surface side, resulting in a problem that the performance as a bearing is deteriorated.

The present invention takes into consideration the problems regarding the surface properties of the materials used for the raceway rings of conventional shelled needle bearings, and creates a bearing with a long life by changing the finishing properties of both sides of the thin plate material. The challenge is to provide bearing rings.

[0006]

[Means for Solving the Problems] As a means for solving the above-mentioned problems, the present invention provides a raceway ring for a shell-type needle bearing formed of a thin plate material into a cylindrical shape, in which the properties of the rolling surface and the fitting surface are made different. At the same time, the raceway ring for shell-type needle bearings was constructed with smooth rolling surfaces.

[0007]

[Function] When the bearing ring configured as above is used as the outer ring, the outer diameter side becomes the fitting surface and the inner diameter side becomes the rolling surface, and when it is used as the inner ring, the outer diameter side becomes the rolling surface and the inner diameter side becomes the fitting surface. . In either case, the rolling surface becomes a smooth surface, and extremely smooth bearing action can be obtained as a component of the bearing.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross section of a typical shelled needle bearing. 1 is an outer ring, 2 is a needle-shaped roller, 3 is a cage, 4 is a shaft hole, 7 is a fitting surface, and 8 is a rolling surface. The outer ring 1 is formed from a thin plate material 1X shown in FIG. 2 as a bearing ring according to the present invention. The thin plate material 1X used has both sides dull-finished in advance. One side 1a is dull finished and the other side 1b is pivot finished.

[0010] Methods for obtaining a dull finish on one side and a pivot finish on the other include a method in which both sides are dull finished using a rolling roll and then a skin pass is performed lightly on one side to crush the surface, and a method in which one side is lightly ground. , or by a method in which each surface is given a different finish using special rolling rolls.

[0011] Here, dull finish means that the surface roughness is 3 to 8.
Pivot finishing refers to a finish of S level, as shown in Figure 2, where the dull surface is finished to a flat surface at a predetermined level, leaving a large number of pivots 5 (concavities) that are concave from the flat surface. Refers to finishing.

Using the thin plate material 1X as described above, FIG.
As shown in a), drawing is performed using a press. At this time, the thin plate material 1X is placed on the mold die B so that the dull finished surface 1a is on the outer diameter side and the pivot finished surface 1b is on the inner diameter side, and pressed with a punch A. Pressing is performed in the same way as normal deep drawing. Processed thin plate material 1
X is formed as an outer ring 1 in the shape of a squeeze cup as shown in FIG. 3(b). That is, the shaft hole 4 is bored, and the opening end of the punch A on the insertion side is bent as shown by the dashed line in FIG. Note that before the above bending process is performed, the rollers 2 and cage 3 are inserted as shown in FIG.

The outer ring 1 formed as described above is processed so that the pivot finished surface becomes the raceway surface on the inner diameter side during the drawing process, so most of the wrinkles that occur on the pivot finished surface are caused by the pivot. It is absorbed, leaving the inner surface with a smooth finish. In addition, the inner diameter surface becomes the raceway surface when used as a bearing, and at that time, the remaining pivot acts as an oil reservoir, resulting in a raceway surface that maintains lubricity.
This provides the advantage of a long bearing life.

On the other hand, since the mating surface on the outer diameter side is left with a dull finish, slippage with the mold die B is moderately suppressed during press working, and the lubricant of the press oil is retained on the material surface. This makes press processing (drawing, ironing, cutting, bending) easier.

FIG. 4 shows another embodiment in which the raceway according to the present invention is used as the inner ring 9. Since the components other than the inner ring 9 are the same as those in the previous embodiment, the same members are given the same reference numerals and the explanation thereof will be omitted. 7' is the fitting surface on the inner diameter side of the inner ring 9, 8
' is the raceway surface on the outer diameter side. Unlike the outer ring 1, this inner ring 9 does not require a flange portion. Therefore, the mating surface 7' has a dull finish, and the rolling surface 8' has a pivot finish.

The inner ring 9 thus formed has a flat and smooth raceway surface, and the mating surface on the inner diameter side is firmly fitted to the shaft, making it extremely convenient as a bearing.

[0017]

[Effects] As explained in detail above, the raceway according to the present invention has different properties on both sides of the raceway made of thin plate material and the rolling surface is formed as a smooth surface. In either case, the inner ring has the advantage that extremely smooth bearing action can be obtained due to the smooth rolling surface, and a long-life bearing can be formed.

[Brief explanation of the drawing]

[Figure 1] Cross-sectional view of a typical shelled needle bearing

[Figure 2
] Enlarged cross-sectional view of thin plate material with dull finish on one side and pivot finish on the other side

[Fig. 3] A diagram illustrating a method of forming an outer ring by deep drawing using a press using a thin plate material.

[Fig. 4] Cross-sectional view of a shell-type needle bearing with an inner ring

[Explanation of symbols]

1 Outer ring 1a Dull finish surface 1b Pivot finished surface 2 Needle-shaped rollers 3 Cage 4 Shaft hole 5 Pivot 7, 7' Saddle face 8, 8' Rolling surface

Claims (1)

[Claims] [Claim 1] A raceway ring for a shell-type needle bearing made of a thin plate material formed into a cylindrical shape, characterized in that the properties of the rolling surface and the fitting surface are different, and the rolling surface is a smooth surface. Raceway ring for shell type needle bearings.