JPH11101240A - Holder for conical roller bearing and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a material yield by forming an circular arc-shaped strip material having plural pockets to house conical rollers in a conical cylinder shape by rolling work. SOLUTION: First, a steel plate is punched to form a circular arc-shaped strip material 40 having a width in the radial direction (process 1). At this time, in order to secure a welding margin in both end parts 41 of the strip material 40, a length (a circumferential directional length) of the strip material 40 is set slightly longer than a length when a holder 4 is unfolded. Next, this strip material 40 is punched at an equal pitch, and plural pockets 4e are formed process 2). In this case, the process 1 and process 2 are simultaneously performed, and the strip material 40 having the pockets 4e may be directly punched from a steel plate. Next, this strip material 40 is formed in a conical trapezoidal cylinder shape by rolling work, and both end parts 41 are brought near to each other (process 3), and both end parts are welded together (process 4).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tapered roller bearing retainer and a method of manufacturing the same.

[0002]

2. Description of the Related Art Tapered roller bearings are, as shown in FIG.
Multiple tapered rollers (3) between inner ring (1) and outer ring (2)
Bearings with inner and outer races (1, 2)
The roller center (O) of a, 2a) or tapered roller (3) is designed to coincide at one point on the axis (not shown). The retainer (4) holding the tapered rollers (3) extends in the roller center (O) direction at a circumferentially equidistant position with a pair of annular portions (4a, 4b) separated in the roller center (O) direction. Both annular parts (4a,
4b) a plurality of pillars bridging between them (4c: see Fig. 3);
The tip of the annular portion (4b) on the inner diameter side is bent toward the inner diameter side to form a conical shape having an annular rib portion (4d) bent and formed, and a tapered roller (4c) between adjacent column portions (4c). A rectangular window-shaped pocket (4e) for accommodating 3) is formed.

Conventionally, the retainer (4) is generally formed by pressing a steel plate. Specifically, FIG.
As shown in, a blank material (11) in the form of a disc is punched from a steel plate (10), the inner diameter of the blank material (11) is punched into a circular shape, and a conical shape is formed by a press die.
It is manufactured by performing post-processing such as removing the pocket (4e) and pushing the pillar [pressing the pillar 4c in the radial direction to form roller stoppers on the two opposing circumferential faces (pocket face 4f)]. You.

[0004]

However, according to this method, the cost cost rises because there is a lot of wasteful punching of the material in some steps. In addition, it is necessary to prepare a plurality of types of press dies according to the difference in the conical shape of the retainer, and the production and storage thereof require a lot of labor and cost.

Accordingly, an object of the present invention is to improve the material yield and to omit or reduce a press die.

[0006]

In order to achieve the above object,
A tapered roller bearing retainer according to the present invention is a retainer base formed by forming an arc-shaped strip having a plurality of pockets for accommodating a tapered roller into a conical cylindrical shape, and both ends of the retainer base. And a joint for welding and fixing the portion.

In this cage, a plurality of pockets for accommodating tapered rollers are formed in an arc-shaped strip, and the strip is formed into a conical cylindrical shape by rolling, and both ends are fixed by welding. Can be formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to FIG.

In the present invention, the cage (4) for tapered roller bearings is manufactured by the following procedures.

First, a steel plate is punched to form an arc-shaped strip material (40) having a width in the radial direction (step). At this time, in order to secure a welding margin at both ends (41: only one end is shown in the drawing) of the strip (40), the length of the strip (40) (length in the circumferential direction). Is slightly longer than the length when the retainer (4) is deployed. Next, a plurality of pockets (4e) are formed by punching the band plate material (40) at an equal pitch (step). In this case, the steps may be performed at the same time, and the strip material (40) having the pocket (4e) may be directly punched from the steel sheet.

Next, the strip material (40) is formed into a truncated conical cylindrical shape by rolling, and both ends (41) are brought close to each other (step), and both ends (41) are welded (step). . As a result, a conical trapezoidal cylindrical retainer base (42) having a pair of annular portions (4a, 4b), a plurality of pillars (4c) and pockets (4e), and both ends of the retainer base (42) A cage (4) having a joint (6) for welding and fixing the portion (41) along the roller center (O) is manufactured.

The above is the main part of the manufacturing process of the cage (4), and the other auxiliary processing is performed in consideration of the workability, processing accuracy, processing cost, etc. This may be performed during the most desirable step or before or after the step. For example, the pillar pressing process for providing the roller stopper on the pocket surface (4f) can be performed after the pocket removing step or after the rolling step or the welding step. The processing of the ribs (4d) is the simplest and most accurate by pressing the inner diameter end of the cage base material (42) after the end of the welding process, but in other processes, for example, Immediately after the pocket removing step, the rib portion (4d) can also be formed by bending the inner peripheral portion of the strip material (40) vertically and then rolling.

When the cage (4) is completed by the above procedure,
Tapered rollers (3: see FIG. 2) are incorporated in each pocket (4e). The tapered rollers (3) can be incorporated not only after the completion of the welding process but also after the rolling process and before the welding process.

In the drawing, the joint (6) is provided so as to straddle the pocket (4e). This is to avoid the influence of welding distortion by shortening the welding line. If not, the joint (6) may be provided so as to pass through the center (the center in the circumferential direction) of the pillar (4c).

[0015]

As described above, according to the present invention, the arc-shaped strip is formed into a conical cylindrical shape by rolling, so that the waste of material due to the conventional punching is small.
Good material yield. Further, a press die for forming a conical cylinder is not required, and the press die can be omitted or reduced. From the above, according to the present invention, the manufacturing cost of the cage can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a plan view (,) and a perspective view (,) showing a manufacturing procedure of a tapered roller bearing retainer according to the present invention.
Is

FIG. 2 is a sectional view of a general tapered roller bearing.

FIG. 3 is a perspective view showing a conventional manufacturing procedure.

[Explanation of symbols]

 3 Tapered roller 4 Cage 4e Pocket 40 Band plate 41 End 42 Cage base 6 Joint

Claims (2)

[Claims] 1. A retainer base formed by shaping an arc-shaped strip having a plurality of pockets for accommodating a tapered roller into a conical cylinder shape, and a joining portion for welding and fixing both ends of the retainer base. A tapered roller bearing retainer comprising: 2. A method of forming a plurality of pockets for accommodating tapered rollers in an arc-shaped strip, forming the strip into a conical cylindrical shape by rolling, and welding and fixing both ends thereof. A method for producing a tapered roller bearing retainer.