JP6036931B2 - Method for manufacturing cage for thrust needle bearing - Google Patents

Description

  The present invention relates to an improvement in a method for manufacturing a thrust needle bearing retainer used mainly in a compressor for a car air conditioner or a planetary unit for an automatic transmission.

  By extending the outer diameter side of the thrust needle bearing cage pocket to the flange, and guiding the roller end face with the outer diameter flange part, the contact surface pressure of the pocket received from the outer end face of the roller is reduced. As a thrust needle bearing that suppresses the wear of the outer diameter side surface, a technique described in Patent Document 1 is known.

  However, the thrust needle bearing retainer described in Patent Document 1 described above is formed by punching out a single plate material and then folding the inner diameter side to form an inner diameter side flange portion. Since the outer diameter side end of the pocket extends into the flange by folding in the opposite direction on the inner diameter side from the diameter side end, the material will be used for multiple times of bending. There was a possibility that the shape of the pocket would be deformed.

  Therefore, in the thrust roller bearing described in Patent Document 2, the shape of the cage is punched out from the iron plate that is a constituent material of the cage, the outer peripheral side flange, the inner diameter side flange, and the central portion of the column portion. Fold each other in the direction of the axis of rotation, and remove the pockets while squeezing so that the outer flanges of the outer periphery are the wall surfaces on the outer periphery of the pockets. Yes.

  In this way, the pocket removal process is performed after folding the central part and collar part of the column part so as to be folded in the direction of the rotation axis, so the pocket shape can be formed with high accuracy without the possibility of deforming the pocket shape. can do.

  However, such a thrust roller bearing retainer requires a so-called ironing allowance when forming the ironing surface to be the outer wall surface of the pocket, in order to secure (thicken) the plate thickness of the cage. However, the amount of ironing becomes small and high machining accuracy is required. For this reason, it has been difficult to allow variations in pocket punching.

JP 2004-301195 A JP 2007-327517 A

  In view of the circumstances as described above, the present invention provides a method of manufacturing a thrust needle bearing retainer that can reduce deformation of a pocket due to material restriction even when a flange is formed by performing a plurality of bends. It was invented to realize.

In order to solve the above-mentioned problem, a manufacturing method of a retainer for a thrust needle bearing according to claim 1,
The inner diameter side flange portion (3), the outer diameter side flange portion (4) for guiding the roller end faces (11, 12), the inner diameter side flange portion (3), and the outer diameter side flange portion (4) are connected. A pocket portion (6) for accommodating the roller (2) between the adjacent column portions (5), and the column portion (5) 2) The portion in contact with the center is a roller holding portion (8) for holding the roller (2), and the outer diameter side end surface (9) of the pocket portion (6) is the outer diameter flange portion. (4) is a method for manufacturing a thrust needle bearing retainer that extends to the outer peripheral side of the outer diameter side flange portion (4) and further has a reinforcing flange portion (10) bent.
A first step of bending a plate material to form the roller holding portion (8) and the inner diameter side flange portion (3);
It is a post process of said 1st process, Comprising: It is located in the inner diameter side rather than the location which the said board | plate material bend | folds by bend | folding the outer-diameter side end surface (13) of the said board | plate material with respect to the outer diameter direction of the said board | plate material. A second step of forming the reinforcing flange portion (10) in contact with the portion;
A third step after the second step, in which the pocket portion (6) is formed by punching;
A process after the third step, a fourth step of forming the outer diameter side flange portion is bent at the inner diameter side than the outer diameter side end face (9) to (4) of the pocket (6), It is characterized by comprising.

  According to the present invention, since the retainer performs the pocket punching process in a subsequent process throughout the entire process, it is possible to reduce deformation of the pocket due to the restriction.

It is a figure explaining embodiment of this invention. It is a figure explaining the modification of embodiment of this invention. It is a figure explaining a part of process of manufacturing a thrust needle bearing.

  FIG. 1 shows an embodiment of the present invention. The thrust needle bearing 1 includes a plurality of rollers 2 arranged radially and a pair of annular portions, each of which is composed of an inner diameter side flange portion 3 and an outer diameter side flange portion 4, and a plurality of these connecting portions. Two members (not shown) each having a pillar portion 5 and a plurality of pocket portions 6 including the pair of annular portions and the pillar portions 5 extending to the outer diameter side flange portion 4. The two members are arranged to be freely rotatable relative to each other.

  The cage 7 is bent so that the inner diameter side and the outer diameter side are parallel to the end face of the roller 2, thereby forming the inner diameter side flange portion 3 and the outer diameter side flange portion 4. In addition, the plurality of column portions 5 that connect the inner diameter side flange portion 3 and the outer diameter side flange portion 4 are bent at portions that abut on the center of the rollers, thereby forming roller holding portions 8 that hold the rollers. . A pocket portion 6 that accommodates the rollers is formed between adjacent column portions, and an outer diameter side end surface 9 of the pocket portion 6 extends to the outer diameter side flange portion 4.

  Since the outer diameter side flange portion 4 is provided with the pocket portion 6 extending, the roller 2 is brought into contact with the outer diameter side end surface of the pocket portion by a centrifugal force during operation of the thrust needle bearing as in the conventional case. Without contacting the outer diameter side flange portion 4, a wide contact area can be secured, and the contact state is also stabilized. Therefore, the PV value, which is the product of the contact surface pressure P and the sliding speed V, can be stably lowered, and wear of the roller 2 or the cage 7 can be suppressed. However, the pocket portion 6 is formed on the outer diameter side flange portion 4. As long as it is provided to extend, the strength is reduced. In order to compensate for the strength reduction, a flange portion 10 is further bent on the outer peripheral side of the outer diameter side flange portion 4 in which the pocket portion 6 extends.

  In the above embodiment, the end surface 11 of the roller 2 is a flat roller. However, as shown in FIG. 2, a roller in which the end surface 12 of the roller 2 is a spherical surface is preferable. By making the end surface of the roller 2 a spherical surface, the contact with the flange portion 4 becomes a point contact, and the PV value can be lowered more stably, so that wear can be further suppressed.

  FIG. 3 is a diagram for explaining a part of the process of manufacturing the thrust needle bearing. One plate material is bent as shown in FIG. 3A to form the roller holding portion 8 and the inner diameter side flange portion 3. Further, as shown in FIG. 3B, the outer diameter side end face 13 is bent, and as shown in FIG. 3C, the pocket portion 6 is formed by punching. And finally, as shown in FIG.3 (d), the outer diameter side flange part 4 in which the pocket part 6 extended is formed by bending on the inner diameter side from the outer diameter side end face 9 of the pocket part 6.

  Compared to the conventional embodiment, the pocket portion punching process is performed in the subsequent steps throughout the entire process when the cage is formed. it can. Further, since a so-called ironing allowance is unnecessary, it is also suitable for a cage made of a relatively thin plate material.

DESCRIPTION OF SYMBOLS 1 Thrust needle bearing 2 Roller 3 Inner diameter side flange part 4 Outer diameter side flange part 5 Column part 6 Pocket part 7 Cage 8 Roller holding part 9 Outer diameter side end face 10 Flange part 11 Roller end face 12 Roller end face 13 Outer diameter side end face

Claims (1)

The inner diameter side flange portion (3), the outer diameter side flange portion (4) for guiding the roller end faces (11, 12), the inner diameter side flange portion (3), and the outer diameter side flange portion (4) are connected. A pocket portion (6) for accommodating the roller (2) between the adjacent column portions (5), and the column portion (5) 2) The portion in contact with the center is a roller holding portion (8) for holding the roller (2), and the outer diameter side end surface (9) of the pocket portion (6) is the outer diameter flange portion. (4) is a method for manufacturing a thrust needle bearing retainer that extends to the outer peripheral side of the outer diameter side flange portion (4) and further has a reinforcing flange portion (10) bent.
A first step of bending a plate material to form the roller holding portion (8) and the inner diameter side flange portion (3);
It is a post process of said 1st process, Comprising: It is located in the inner diameter side rather than the location which the said board | plate material bend | folds by bend | folding the outer-diameter side end surface (13) of the said board | plate material with respect to the outer-diameter direction of the said board | plate material. A second step of forming the reinforcing flange portion (10) in contact with the portion;
A third step after the second step, in which the pocket portion (6) is formed by punching;
A process after the third step, a fourth step of forming the outer diameter side flange portion is bent at the inner diameter side than the outer diameter side end face (9) to (4) of the pocket (6), A method for manufacturing a retainer for a thrust needle bearing, comprising:

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