JPH11210764A - Bearing outer ring, its manufacture, and clutch release bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing outer ring manufacturing method whereby the materials used and cost can be reduced to obtain an even higher efficiency of production. SOLUTION: In a bearing outer ring manufacturing method including a blanking process whereby a blank 21 is obtained by punching a metallic workpiece 20 such as a small-thickness steel plate and a drawing process whereby a cylindrical drawn product is obtained by drawing the blank 21, a deformed area RS in which a dimension DL in the directions DE 1, DE 2 of formation of lugs is set to be shorter by an amount equal to the amount HE of the lugs formed than a dimension DS in the direction DEN in which no lug is formed is punched as the punched area of the metallic workpiece 20 during the blanking process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch release bearing mainly used in automobiles and the like, a bearing outer ring applied to the bearing, and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing a clutch release bearing of an automobile. As shown in the figure, the clutch release bearing includes an inner ring (1) and an outer ring (2), and both wheels (1).
And (2) a rolling element (3) such as a ball, which is rotatably interposed therebetween, as a basic component, and is disposed between the engine and the transmission, and one end of the inner ring (1). A flange (1a), which is in contact with the diaphragm spring of the clutch, is integrally formed on the outer periphery to temporarily support the rotation of the engine.

In such a clutch release bearing, the inner ring (1) and the outer ring (2) are generally manufactured by press forming using a thin steel plate as a material in order to reduce the weight and cost. .

For example, conventionally, as shown in FIGS. 7 and 8, a bearing outer ring (2) is made of a metal work material (1) such as a thin steel plate.
9) By punching out a perfect circular blank region (RC) in (0) to obtain a perfect circular blank product (11) and subjecting the blank product (11) to a plurality of drawing processes as shown in FIG. Thus, a cylindrical drawn product (12) is obtained. Then, as shown in FIG.
The bottom part (14) of the drawn product (12) is punched out in a circular shape to form a circular hole (14a), and then, as shown in FIG. ) Is removed.

[0005]

In the meantime, when a blank product (11) obtained by punching a plate-shaped metal working material (10) into a perfect circle as in the above-mentioned conventional example is drawn into a cylindrical shape. An ear (12a) is formed at the end of the peripheral side wall of the drawn product (12) based on the anisotropy of the processed material (10).
In a state where the ear (12a) is left,
Since the accuracy of outer ring groove processing etc. decreases,
The ear (12a) needs to be swirled away.

However, in the above-mentioned turning process, FIG.
As shown in FIG. 0, the portion corresponding to the ear height (HE) and the portion corresponding to the turning allowance (HL) required for the turning are cut off by turning. Will increase the amount of materials used,
There is a problem that the cost is increased.

[0007] In addition, the number of steps is increased by the amount of the ear resection step, which causes a problem that the production efficiency is reduced. Furthermore, since the ears (12a) are cut off by machining such as turning, machining during press working such as blanking or drawing is performed at a different rate from press working with low efficiency. In addition, there has been a problem that the respective steps cannot be smoothly shifted, and the production efficiency is further reduced.

The present invention provides a bearing outer ring, a method of manufacturing the same, and a clutch release bearing capable of solving the above-mentioned problems of the prior art, reducing the materials used and the cost, and obtaining higher production efficiency. The purpose is to do.

[0009]

In order to achieve the above object, the first aspect of the present invention provides a blanking step of punching a sheet metal material to obtain a blank product, and performing a drawing process on the blank product. And a drawing step of obtaining a cylindrical drawn product, comprising: a drawing step of obtaining a cylindrical drawn product, wherein when a circular blank product is drawn, an ear of a drawn product edge generated based on anisotropy of a metal work material. Generation direction and amount
Before performing the blanking step, it is predicted in advance, and in the blanking step, the dimension in the direction corresponding to the direction in which the ears are generated is compared with the dimension in the direction corresponding to the direction in which no ears are generated. The gist is that a region having a different shape set short by the generation amount is punched as a punched region of the metal processing material.

In the method for manufacturing a bearing outer ring according to the present invention,
In the blanking step, a blank product is obtained by punching out an irregularly shaped region in which the size in the ear generation direction is shortened by the amount of ear generation, and the blank product having the irregular shape is drawn. Ears can be prevented. Therefore, there is no need to perform machining such as turning for removing the ears, and the number of steps can be reduced.
There is no need to perform low-efficiency turning or the like that is different from press working. Therefore, the bearing outer ring can be manufactured only by pressing such as blanking and drawing.

Further, in the present invention, since the ear is not cut off, there is no need to use extra material for the cut.

In the first invention, at least one of the inner peripheral corner portion and the outer peripheral corner portion of the peripheral side wall end surface of the drawn product is crushed and deformed by the pressing of the pressing member, thereby forming a chamfered portion. Preferably, the method includes a chamfering step of forming

That is, in this case, the chamfer for mounting the bearing seal can be formed by high-efficiency pressing without using low-efficiency turning or the like.

In the first aspect, it is preferable that the drawing step and the chamfering step are performed simultaneously.

That is, in this case, it is not necessary to perform the chamfering in a separate step, so that the production efficiency can be further improved.

On the other hand, the second invention specifies a bearing manufactured by the first invention.

A third aspect of the present invention is a clutch release bearing comprising an inner ring and an outer ring, and a rolling element rotatably interposed between the two wheels, wherein the ear is formed when the outer ring is drawn. The gist is that the outer ring is drawn out of a non-circular blank product that does not generate.
In the invention, it is preferable that the large-diameter end surface of the outer race is a punched surface.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing an outer ring in a clutch release bearing according to an embodiment of the present invention will be described below in accordance with a manufacturing procedure.

As shown in FIG. 1 and FIG. 2, an irregular shaped punched region (RS) in a metal workpiece (20) made of a thin steel plate is punched to form an irregular shaped blank product (21).
Get.

Here, as described in the conventional example, when a blank product obtained by punching a circular punching region (RC) is drawn into a cylindrical shape, the blank product is drawn due to the anisotropy of the work material (20). Then, an ear is formed on the opening-side peripheral end surface of the drawn product.

Therefore, in the present embodiment, in consideration of the direction and amount of ears generated in the drawn product in advance, the peripheral wall end face of the drawn product is arranged in a flat surface, and in the blanking step, The processing material (20) is punched into a shape different from the perfect circular shape.

More specifically, when a thin steel plate is used as the work material (20) as in the present embodiment, the direction in which the ears are generated depends on the rolling direction (DE1) of the work material (20).
And a direction (DE2) orthogonal to the rolling direction (DE1)
The direction in which ears do not occur is defined as a direction (DEN) having an angle of 45 ° with respect to the rolling direction.

On the other hand, when the ear is conventionally removed by turning, it is necessary to remove not only the ear height (HE) but also the turning allowance (HL) required for turning. Therefore, for example, when manufacturing an outer ring product having the same size as the conventional one, first, a portion (2HL) corresponding to the turning allowance (HL) is subtracted from the diameter of the perfect circular punching region (RC) having the same size as the conventional one. The obtained major axis (DL) and the minor axis (DS) obtained by subtracting (2HE) corresponding to the ear height (HE) from the major axis (DL) are obtained. In addition, when these are represented by a relational expression, the major axis (DL) −the equivalent of the turning allowance (2HL) = the minor axis (D
S).

In this embodiment, the diameter in the ear generation direction (DE1) (DE2) of the metal workpiece (20) is set to the short diameter (DS), and the direction in which no ear is generated (DE).
N), the irregularly shaped region (R
S) is specified, and the region is punched as a punched region (RS) of the metal work material (20) to obtain a blank product (21) having a different shape.

Next, the blank product (2)
1) is subjected to a plurality of drawing processes to obtain a cylindrical drawn product (22) as shown in FIG.

As described above, the drawn product (22) is obtained by drawing a blank product (21) in which the diameter in the ear generation direction (DE1) (DE2) is shortened by the amount of the ear generation. Ears can be prevented from being generated in (22), and the opening side peripheral end surface (23a) in the peripheral side wall (23) of the drawn product (22) is arranged in a flat surface.

According to the present invention, the direction of the die relative to the rolling direction of the thin steel plate to be used is determined by using a blanking die of a different shape which has been corrected in advance in consideration of the direction in which the ears are generated and the amount of the generation. Since the blanks are punched together, regardless of the direction when drawing the obtained blank product, regardless of the direction, even if the blank product is set in the drawing die at random, after the drawing process, a drawn product with a flat edge is obtained. can get.

Next, as shown in FIG. 4, the bottom portion (24) of the drawn product (22) is punched out into a circular shape by an inner diameter punching process to form a circular hole (24a).

Subsequently, if necessary, as shown in FIG.
The inner peripheral corner portion of the opening side peripheral end surface (23a) of the drawn product (22) is crushed and deformed by punching to form a chamfered portion (23b) for mounting a bearing seal (chamfering step). The production of the bearing outer ring is completed by performing various processes.

As described above, according to the method of manufacturing the bearing outer ring of the present embodiment, in the blanking step, the irregularly shaped region (RS) in which the diameter in the ear generation direction (DE1) (DE2) is shortened by the ear generation. ) Punched blank products (21)
Since the product (21) is obtained by drawing, the opening side peripheral end surface (23a) of the peripheral side wall (23) of the drawn product (22) is formed flat, and the occurrence of ears is prevented. Therefore, there is no need to perform machining such as turning for removing the ears, and the number of steps can be reduced, and since it is not necessary to perform low-efficiency turning, etc., which is different from press working, each process can be smoothly shifted. And the production efficiency can be improved.

Further, in the present embodiment, since no ears are generated, it is not necessary to delete the ears as a matter of course. In other words, since the material equivalent to the ear and the material equivalent to the turning allowance required for the turning are not excessively used, it is possible to reduce the material used and the cost.

In the bearing outer ring according to the present embodiment, the chamfered portion (2) is formed at the inner peripheral corner of the peripheral side wall end surface (23a).
3b), the chamfered portion (2
By using 3b), the bearing seal can be mounted without any trouble.

Further, in the present embodiment, since the peripheral wall end surface (23a) is located within a flat surface at the time of drawing, the surface pressing portion is formed at the stage of the pressing process such as drawing or inner diameter punching. Press (crushing) using a punch provided with a chamfered portion (23b)
Can be formed. Therefore, since all processes from blanking to chamfering can be performed using a high-efficiency pressing process, it is possible to manufacture a bearing outer ring with a chamfered part without hindrance while maintaining high production efficiency. Can be.

The chamfering step can be performed simultaneously with the drawing step and the inner diameter cutting step. That is, the punch for drawing and the punch for punching the inner diameter are provided with a chamfered portion. At the same time as the punch is driven, the chamfered portion is pressed against the chamfered portion forming region, and the region is crushed and deformed. The chamfered portion can be formed simultaneously with the processing and the inner diameter punching. In this case, chamfering
Since it is not necessary to perform the process in a separate step, the production efficiency can be further improved.

Here, as shown in FIG.
In order to form b), the surface pressing amount (T1) of the inner peripheral corner portion of the peripheral wall end surface (23a) is suitably 10 to 30% with respect to the wall thickness (T) of the peripheral wall (23). is there. That is, if the amount of surface pressing is too small, there is a possibility that the insertability of the bearing seal may not be improved during the assembly of the bearing. Conversely, if the amount of surface pressing is too large, the chamfering may be performed. Undesired portions other than the portion (23b) may be deformed to form burrs and protrude upward or downward, or the roundness accuracy of the peripheral side wall (23) may be reduced.

However, in the present invention, it is not always necessary to form the chamfered portion (23b), and the chamfered portion may be formed at the outer peripheral corner of the peripheral side wall end surface (23a) as necessary. Is also good.

[0037]

As described above, according to the method for manufacturing a bearing outer ring of the first invention, in the blanking step, a blank product is formed by punching out an irregularly shaped region whose dimension in the ear generation direction is shortened by the amount of ear generation. Since the obtained blank product is drawn by drawing, the occurrence of ears at the edge of the drawn product can be prevented, and the edge can be arranged in a flat surface. Therefore, there is no need to perform machining such as turning for removing the ears, and the number of steps can be reduced, and since it is not necessary to perform low-efficiency turning, etc., which is different from press working, each process can be smoothly shifted. Can be
Production efficiency can be improved. Further, in the present invention, since the ear is not cut off, there is no need to use extra material for the cut, and the effect of reducing the amount of material used and the cost can be obtained.

In the first invention, when a chamfered portion is formed at the edge of the drawn product by press working such as pressing of a pressing member, a high-efficiency press is performed without using low-efficiency turning or the like. Since a chamfer for mounting a bearing seal can be formed by processing, there is an advantage that a bearing outer ring with a chamfer for easily inserting a bearing seal can be manufactured while maintaining high production efficiency.

Furthermore, in the first aspect, when the drawing step and the chamfering step are performed simultaneously, there is no need to perform the chamfering in a separate step, so that there is an advantage that the production efficiency can be further improved. .

On the other hand, the second invention specifies a bearing outer ring manufactured by the manufacturing method of the first invention, and can provide the same effects as above.

Further, a third aspect of the present invention specifies a clutch release bearing using a bearing outer ring manufactured by the manufacturing method of the first aspect of the invention, and the same effects as described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing a punched region of a metal workpiece used in a method of manufacturing a bearing outer ring according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a blank product in the manufacturing method of the embodiment.

FIG. 3 is a sectional view showing a drawn product in the manufacturing method of the embodiment.

FIG. 4 is a cross-sectional view showing a product after an inner diameter removing step in the manufacturing method of the embodiment.

FIG. 5 is an enlarged sectional view of a main part showing a product after a chamfering step in the manufacturing method of the embodiment.

FIG. 6 is a half sectional view showing a clutch release bearing of an automobile.

FIG. 7 is a plan view showing a punched region of a metal workpiece used in a conventional method of manufacturing a bearing outer ring.

FIG. 8 is a cross-sectional view showing a blank product in a conventional manufacturing method.

FIG. 9 is a sectional view showing a drawn product in a conventional manufacturing method.

FIG. 10 is a sectional view showing a product after an inner diameter removing step in a conventional manufacturing method.

FIG. 11 is a cross-sectional view showing a product after an ear removing step in a conventional manufacturing method.

[Explanation of symbols]

 Reference Signs List 20 metal working material 21 blank product 22 drawn product 23 peripheral wall 23a open end face 23b chamfered portion DE1, DE2 ear generation direction DEN ... ear-free direction DL ... long diameter (size in ear-generation direction) DS: short diameter (dimension in the direction in which no ear is generated) HE: ear height HL: cutting allowance RS: punching area

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Taki 3-3-5 Tenmabashi, Kita-ku, Osaka Nakanishi Kinzoku Kogyo Co., Ltd.

Claims (6)

[Claims] 1. A method of manufacturing a bearing outer ring, comprising: a blanking step of punching a sheet metal workpiece to obtain a blank product; and a drawing step of subjecting the blank product to a drawing process to obtain a cylindrical drawn product. Therefore, when a circular blank product is drawn, the direction and amount of ears generated at the edge of the drawn product edge generated based on the anisotropy of the metal work material are predicted in advance before performing the blanking step. In addition, in the blanking step, an irregularly shaped region in which the dimension in the direction corresponding to the ear generation direction is set shorter than the dimension in the direction corresponding to the direction in which the ear does not occur by the amount of ear generation. A method for manufacturing a bearing outer ring, wherein the metal working material is punched as a punched region. 2. A chamfering step of forming a chamfered part by crushing and deforming at least one of an inner peripheral side corner part and an outer peripheral side corner part on a peripheral side wall end face of the drawn product by a pressing member. The method for manufacturing a bearing outer ring according to claim 1. 3. The method according to claim 2, wherein the drawing step and the chamfering step are performed simultaneously. 4. A bearing outer ring manufactured by the manufacturing method according to claim 1. 5. A non-circular blank product in which a clutch ring bearing including an inner ring and an outer ring and a rolling element rotatably interposed between the two wheels does not generate ears when the outer ring is drawn. A clutch release bearing characterized in that it is an outer ring formed by drawing. 6. The clutch release bearing according to claim 5, wherein the large-diameter end surface of the outer ring is a punched surface.