JPH0342260Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a cage suitable for thrust roller bearings, particularly thrust cylindrical roller bearings.

[Conventional technology and problems]

A thrust roller bearing generally consists of an inner ring, an outer ring, rollers, and a cage that houses the rollers. The cage for this thrust roller bearing is
Since the inner and outer rings are independent, it is necessary to prevent the rollers from falling off on both sides of the cage. Furthermore, it is desired that the retainer be capable of accommodating a large number of rollers in order to increase the load carrying capacity of the thrust roller bearing. Conventional cages for thrust roller bearings include a one-piece cage made by punching and bending a steel plate, and a box-shaped cage made by combining two case-shaped steel plates. The former one-piece holder (for example, the
36461) are shown in Figures 3 and 4. The cage 1 has inner and outer peripheral walls 2 and 3 bent for reinforcement, and a pocket 4 that accommodates two rollers 5. The outwardly or inwardly directed pillars 6 and 7 produced by forming this pocket 4 are formed by the rollers 5 and 5.
side parts 8, 9 and intermediate part 10 that guide the
have. Moreover, between these parts, there are holding parts 11 and 12 bent outward and holding parts 13 and 14 bent inward. Therefore, the cage 1 has the rollers 5 in the cages 11, 12 and 13,
14 to prevent the rollers 5 from falling off on both sides of the cage 1. Although the single-piece cage described above has the advantage of being able to be mass-produced with high precision, there are restrictions on the shapes of the rollers that can be used. For example, it can be used for rollers that are long in the axial direction such as needles or rods, but in the case of cylindrical rollers where the length and radial dimensions are 1:1,
The length of the pocket becomes short, and it becomes difficult to form the holding portions 11, 12, 13, and 14 within this length range. On the other hand, a box-shaped cage is constructed by combining two steel plates each with a pocket, so it is possible to hold the cylindrical rollers, but it is necessary to assemble the cage by accurately aligning the positions of the pockets on both steel plates. There is a risk that rotation of the pocket may be hindered if the pocket position shifts during use. Furthermore, in manufacturing the cage, unless all the pockets of both steel plates are punched out at the same time, the pocket pitches will be misaligned, making the cage extremely impractical. As described above, among cages using steel plates, a single-piece cage has various advantages in terms of manufacturing and use, and it is desired to adopt a single-piece cage also for cylindrical rollers. This invention was made in view of the above points, and the purpose is to provide a cage that holds a large number of cylindrical rollers using a single steel plate.

[Structure of the idea]

In order to achieve the above-mentioned purpose, this invention forms an N-shaped cross section with both inner and outer sides using an annular inclined plate and circumferential walls provided on the inner and outer circumferences thereof, and the outer circumferential wall of the inner row and the inner circumferential wall of the outer row are connected to each other. They are connected to form an intermediate wall, and each inclined plate is provided with a pocket having a width and length to fit the roller, and both ends of the pocket are formed to have a width narrower than the diameter of the roller.

[Effect]

When the rollers are fitted into the pockets provided on the annular inclined plates, the guide portion located at the center of each inclined plate comes into contact with the largest diameter portion of the rollers and guides the rolling of the rollers. Both ends of the pocket serve as holding parts for the roller in the radial direction, and interference between the holding parts and the ends prevents the roller from falling off.

【Example】

Hereinafter, an embodiment of this invention will be described based on FIGS. 1 and 2. As shown in the figure, the cage 15 is formed using a single steel plate, and annular inclined plates 16 and 17 provided on the inner and outer rows of the cage 15 have pockets for housing the rollers 18. 19 and 20 are punched out at regular intervals in the circumferential direction, and peripheral walls 21 and 22 provided on the inner circumference of the inclined plate 16 and the outer circumference of the inclined plate 17 are bent to reinforce the retainer 15. Further, the inclined plates 16 and 17 are connected by an intermediate wall 23.
In the illustrated case, the rollers 18 are rollers having the same ratio of diameter to length. The central portions of the inclined plates 16, 17 contact the maximum diameter portions of the rollers 18, and serve as guide portions 24, 25 for rolling of the rollers 18.
Both ends on both side edges of are curved inwardly,
They serve as holding parts 26 and 27 for the roller 18 in the radial direction. Guide parts 24, 2 of pockets 19, 20
In the illustrated case, 5 is formed by making a straight line within a range of about one-third of the total length of the pocket, but the guide portions 24, 25 and the holding portions 26, 27 are formed by making the entire side edges arcuate. You can. Height dimension H of the peripheral walls 21 and 22 of the cage 15
are set so that when the rollers 18 are placed parallel to the pockets 19, 20 on the inclined plates 16, 17, respectively, the end surfaces of the rollers 18 are in contact with each other or are lower than the pockets 19, 20. Therefore, the roller 18 can be fitted into the pockets 19 and 20 by moving the roller 18 in the order of the dashed line, dashed double dot line, and solid line shown in the figure. Here, the pockets 19 and 20 uniformly hold the roller 18, and the axial movement of the roller 18 can be restricted by the holding parts 26 and 27 at both ends. If an error occurs in the pockets 19, 20 during press punching, the roller 18 will move in the axial direction by the amount of error, causing the pocket to come off. Therefore, in order to reduce the gap between the end surface of the roller 18 and the intermediate wall 23, pockets 19 and 20 are provided on both sides of the intermediate wall 23.
The protrusions 28 and 29 are bent toward the side, and the end faces of the protrusions 28 and 29 limit the movement of the roller 18 in the axial direction. Note that the pockets 19 and 20 may be punched out in a staggered manner in the circumferential direction. Furthermore, the cage of this invention is not limited to use with rollers as shown in the drawings, but can also be used with needle or rod-shaped rollers.

【effect】

As described above, in this invention, pockets for accommodating the rollers are formed in the annular inclined plates provided on the inner and outer rows of the cage, and both ends of the pockets are sandwiched between the diameters of the rollers. Rollers with the same height ratio will not fall off on both sides of the cage. Moreover, a large number of rollers can be accommodated in the inner and outer rows of pockets.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of the cage according to this invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a longitudinal sectional view of a conventional cage, and Fig. 4 is shown by the arrow - in Fig. 3. A cross-sectional view along the line. 15... Cage, 16, 17... Annular inclined plate,
18...Koro, 19, 20...Pocket, 21,
22...Peripheral wall, 23...Intermediate wall.

Claims (1)

[Scope of utility model registration request] An annular inclined plate and circumferential walls provided on its inner and outer peripheries form an N-shaped cross section with both inner and outer sides, the outer circumferential wall of the inner row and the inner circumferential wall of the outer row are connected to form an intermediate wall, and each of the inclined plates has rollers. A retainer for a thrust roller bearing, which is provided with a pocket having a width and length to fit into, and has both ends of the pocket formed to have a width narrower than the diameter of the rollers.