JP2009191908A - Assembly and inspection method of roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembly and an inspection method of a roller bearing capable of reducing production of unacceptable assembled roller bearings, raising work performance and reducing costs by removing unacceptable products by inspecting the width of a retainer before installing a roller. <P>SOLUTION: The assembly line for the roller bearing has at least a roller assembly process, a roller-defect inspection process, and a turning inspection process. In the roller assembly process, the roller is attached to the retainer. A retainer inspection process used for performing a 100-percent inspection on the width of the roller stopper of the retainer is provided before the roller assembly process. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for assembling and inspecting a roller bearing in which rolling elements are accommodated in a pocket of a cage.

  A roller, which is a rolling element that constitutes a roller bearing, is generally accommodated in a pocket of a cage, and a roller stopper that rotatably holds the roller at a predetermined position is provided in the pocket.

FIG. 2 is a plan view of a main part of an example of a roller bearing cage (the drawing shows a thrust roller bearing cage) and a cross-sectional view taken along the line AA.
The cage 1 is formed into an annular shape by pressing a metal plate such as a carbon steel plate, for example, and a substantially inverted trapezoidal concave portion 2 having a predetermined width in the circumferential direction is formed in the annular portion 1a. A plurality of pockets 3 are provided at predetermined intervals in the circumferential direction from 2 to the inner and outer diameter side flanges.
A roller stopper 4a is provided opposite to the circumferential edge of the pocket 3 on the outer diameter side and the inner diameter side, and a roller stopper 4b is also provided opposite to the recess 2. And the roller (for example, cylindrical roller) which is a rolling element is hold | maintained at roller stopper 4a, 4b, and is accommodated rotatably.

In such a roller bearing, a circumferential interval (hereinafter referred to as a width) S of the roller stoppers 4a, 4a facing the cage 1 and an axial interval of the roller stopper 4a and the stopper 4b (if necessary) ( S ₁ ) (hereinafter referred to as width) needs to have a predetermined dimension. Wakashi, these widths S or width S, when S ₁ is smaller than a predetermined size, difficult to accommodate the pocket 3 variation in roller, housing also the rotation is not smooth, and these widths are predetermined dimension If it is larger, there is a problem that the roller accommodated in the pocket 3 falls off (in the following description, the roller bearing using the cage shown in FIG. 2 is called a normal roller bearing).

  Conventionally, as shown in FIG. 3, a normal roller bearing assembly line includes a roller assembly process in which a roller is assembled by assembling a roller in a cage, and a roller missing for inspecting the assembled roller bearing for a missing roller. It consisted of an inspection process and a rotation inspection process for inspecting whether the roller bearings rotate smoothly. In addition, the cage is manufactured in a separate process, the roller stopper width is inspected for multiple rods (for example, thousands), and all cages except for rejected products are assembled by roller assembly. It was sent to the process. (Patent literature and non-patent literature related to such an assembly line for ordinary roller bearings have been investigated but could not be found.)

FIG. 5 is a perspective view of a welded cage constituting the main part of the roller bearing, and FIG. 6 is a front view of a main part of FIG.
A welded cage 11 constituting the main part of the roller bearing is formed with a substantially inverted trapezoidal concave portion 12 along the longitudinal direction in the width direction of a belt-shaped body made of a carbon steel plate or the like, and the concave portions 12 at predetermined intervals in the longitudinal direction. A pocket 13 is provided from the heel to the heel, cut into a predetermined length, bent into a circle, and welded at both ends 15 to form a substantially cylindrical weld cage 11 as shown in FIG. It is a thing.

An outer diameter side roller stopper 14a is provided facing the circumferential edge of the pocket 13 of the welded cage 11, and an inner diameter roller stopper 14b is opposed to the circumferential edge of the recess 12. (The roller stopper is omitted in FIG. 5). Rollers that are rolling elements (for example, needle rollers) are held by the outer diameter side roller stopper 14 a and the inner diameter side roller stopper 14 b and are rotatably accommodated in the pocket 13.
A roller bearing using such a welded cage 11, particularly a roller bearing used for a high-speed rotating part, requires a detailed inspection in an assembly line, and is subjected to extremely strict process control.

  FIG. 7 is a block diagram showing a process of a conventional roller bearing assembly line using the welded cage 11. First, the axial dimension of the welded cage 11 is inspected in the axial dimension inspection process, and the welded cage 11 that has passed this inspection is sent to the roller assembly process to assemble the rollers. Roller bearings assembled with rollers are sequentially subjected to rotational torque inspection, roller missing inspection, inner diameter dimension inspection, cage peel-off inspection, and rotation inspection. Roller bearings that fail in each process are removed. Only the roller bearings that are discarded and passed in the previous process are sent to the subsequent process. Finally, the roller bearings that passed the rotation inspection are packaged and shipped. In this case as well, welded cages are manufactured in a separate process as in the case of ordinary roller bearing cages, and all welded cages except those rejected by sampling inspection are used in the axial dimension inspection process. I was sending. (Patent literature and non-patent literature related to the assembly line of roller bearings using such a welded cage have been investigated but could not be found.)

In the conventional normal roller bearing assembly line, a cage with a mix of defective products is sent to the roller assembly process. As a result, although the rollers themselves are good products, the entire roller bearings must be disposed of, so the amount of defective products to be disposed of becomes high, resulting in costs. There was a problem of rising.
In addition, because there are defective products in the cage, troubles occur in assembling the rollers into the cage in the roller assembly process, resulting in a stagnation in the roller assembly line and a reduction in work efficiency. was there.

In addition, the same problems as in the above case also occur in the roller bearing assembly line consisting of welded cages, but in particular, because there are a wide variety of inspection items, rejected roller bearings after roller assembly. There was a problem that the occurrence rate of was high.
As described above, in the roller bearing, management of the width of the roller stopper provided in the cage is extremely important in assembling the roller bearing.

  The present invention has been made to solve the above-described problems. Before assembling the rollers, the assembled rollers are obtained by inspecting the width of the roller stoppers for the total number of cages and removing rejected products. An object of the present invention is to provide a roller bearing assembly and inspection method that can reduce the generation of rejected bearings, improve work efficiency, and reduce costs.

  The roller bearing assembly and inspection method according to the present invention includes a roller assembly process for assembling rollers in a cage, a roller missing inspection process, and a rotation inspection process. A cage inspection process for inspecting the width of the roller stopper with respect to the total number of the cages is provided.

  Moreover, a welded cage is used for the above cage.

  According to the present invention, before assembling the rollers, the roller stoppers are inspected for the total number of the cages to remove the rejected products, and only the passed cages are sent to the roller assembly process to assemble the rollers. Therefore, the generation of rejected products due to the post-process of the assembled roller bearing is greatly reduced, the amount of waste due to the rejection can be reduced, and the work efficiency can be improved and the cost can be reduced.

[Embodiment 1]
FIG. 1 is a process diagram of a normal roller bearing assembly and inspection method according to Embodiment 1 of the present invention.
In this embodiment, the normal roller bearing assembly line is a cage inspection process, roller assembly process, roller missing inspection process, and rotation inspection process, and the roller stopper width of the cage is inspected before the roller assembly process. A cage inspection process is provided.

In the cage inspection process, stop 4a roller facing the total number of retainer 1 shown in FIG. 2, the width S of 4b, or the width S ₁ of the width S where stop 4a and 4b, for example, by an optical instrument measured, these widths S or dimensions of width S and S ₁ is sent to the next time the assembly process as accepted products is within a predetermined range, or does not reach the predetermined range, or fail is in excess of this Remove as product and discard.

  And the cage | basket | car 1 which passed the cage | basket test | inspection became a roller bearing by assembling a roller in a roller assembly process, and it was sent to the next roller missing inspection process, and the presence or absence of the roller missing was inspected. Things are removed and discarded, and the passed roller bearings are sent to the rotation inspection process. In this inspection, the defective roller bearing is removed and discarded, and the passed roller bearing is packed and shipped as a finished product.

In this case, the cage inspection process is increased compared to the conventional roller bearing assembly line, but the time required for the inspection is extremely short (for example, about 3 seconds), so the speed of the roller bearing assembly line is hardly affected. Don't give.
Also, in the cage inspection process before the roller assembly process, the width dimensions of the roller stoppers 4a or 4a and 4b are inspected, and only the acceptable products are sent to the next roller assembly process so that the rollers are assembled. There are very few defective products found in the roller missing inspection process and the rotation inspection process of the roller bearing, and most of them are acceptable products.

According to the present embodiment, the roller stopper width is inspected for the total number of cages before roller assembly, and rejected products of relatively inexpensive cages are removed at the stage of this inspection. Is sent to the roller assembling process, the number of rejected products due to roller missing inspection and rotation inspection of the assembled expensive roller bearing is greatly reduced, and the majority can be shipped as acceptable products.
As a result, the amount (loss) of rejected products to be discarded can be greatly reduced, and troubles in the roller assembly process can be eliminated, so that the assembly line does not stagnate and work efficiency is improved. Can do. And by these, merchandise value can improve and reliability can be improved, and also work efficiency can improve and cost can be reduced.

[Embodiment 2]
In the first embodiment, a method for assembling and inspecting a roller bearing using a normal cage has been described. However, in this embodiment, assembling and inspection of a roller bearing using a welded cage (hereinafter referred to as a welded roller bearing). It is about the method.

FIG. 4 is a process diagram of the method for assembling and inspecting the welded roller bearing according to the present embodiment.
In the present embodiment, as shown in FIG. 4, between the welding cage axial dimension inspection step and the roller assembly step, almost the same as in the first embodiment, the total number of welded cages is reduced. A roller stopper width inspection process for inspecting the stopper width dimension is provided. Then, for example, with an optical measuring instrument, as shown in FIG. 6, the width S of the outer diameter side roller stoppers 14a and 14a facing each other, and the width S of the outer diameter side roller stopper 14a and the inner diameter side roller stopper 14b as required. The width S ₁ is inspected, and only the weld cage 11 in which these widths S or S and S ₁ are within a predetermined range are sent to the next roller assembling step, and the rollers are assembled. The following steps are the same as those in the prior art described with reference to FIG.

  According to the present embodiment, substantially the same effect as in the first embodiment can be obtained, but the economic effect is great because there are many inspection items, and the product value is further improved and the reliability is improved. In addition, the cost can be reduced and the work efficiency can be improved.

[Comparative example]
Table 1 shows the inspection results of the welded roller bearing in the conventional assembly and inspection method. The number of welded cages used was 70,000.
First, the roller was assembled to the welded cage, and an inspection as shown in FIG. 7 was performed. As a result, 0.7% of the rejected products were considered defective in assembly, 0.6% of the rejected products due to missing rollers, 5.4% of rejects occurred in contact with and out of contact with others, and a total of 6.4% failed, 93.6% passed, and about 4,500 welded roller bearings were discarded. And it turned out that many of these rejected products originate in the width | variety of the roller stopper of a welding cage.

Table 2 shows the results of the assembly of the welded roller bearing according to the second embodiment and the inspection results by the inspection line. The number of welded cages used is 70,000 as described above.
First, the total number of welded cages was inspected for the width of the roller stopper. This inspection resulted in 5.4% of rejected products, and the number of accepted products was 94.6% (about 66,200). Next, the roller was assembled to the welded cage that passed the inspection, and the assembly inspection, the roller missing inspection, the internal contact, the external contact defect, and other inspections were performed. A 1% reject product was generated, the reject rate was 0.4%, and the pass rate was 99.6% when the number of accepted products of the welded cage was 100.

  As described above, according to the assembly and inspection method of the welded roller bearing according to the second embodiment, a 5.4% defective product is generated in the inspection of the roller stopper of the relatively low-cost welded cage. The number of rejected expensive roller bearings with only 0.4% (about 2,650) can greatly reduce the failure rate of welded roller bearings. The amount of money lost due to disposal was greatly reduced.

  In the above description, the method for assembling and inspecting the roller bearing using the illustrated cage or welded cage has been described. However, the present invention is not limited to this, and rollers using other structures or welded cages are used. The present invention can also be implemented in bearing assembly and inspection lines.

It is process drawing of the assembly and inspection method of the normal roller bearing which concerns on Embodiment 1 of this invention. It is the top view of the principal part of an example of the holder | retainer of a normal roller bearing, and its AA sectional drawing. It is process drawing of the assembly and inspection method of the conventional normal roller bearing. It is process drawing of the assembly and inspection method of the welding roller bearing which concerns on Embodiment 2 of this invention. It is a perspective view of an example of a welding holder. It is the front view of the principal part of FIG. 5, and its BB sectional drawing. It is process drawing of the assembly and inspection method of the conventional welding roller bearing.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Normal roller bearing retainer, 2 recessed part, 3 pocket, 4a, 4b roller stopper, 11 welding retainer, 12 recessed part, 13 pocket, 14a outer diameter side roller stopper, 14b inner diameter side roller stopper, 15 welding.

Claims (2)

In a roller bearing assembly line having at least a roller assembly process for assembling rollers in a cage, a roller missing inspection process, and a rotation inspection process,
A roller bearing assembling and inspecting method characterized in that, before the roller assembling step, a cage inspection step for inspecting the width of the roller stopper is provided for the total number of the cages.   The roller bearing assembly and inspection method according to claim 1, wherein the cage is a welded cage.

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