CN212868175U

CN212868175U - Multi-row thrust cylindrical roller bearing

Info

Publication number: CN212868175U
Application number: CN202022013597.7U
Authority: CN
Inventors: 孙建修; 王黎峰; 刘波; 何嘉博; 郑晓生
Original assignee: Luoyang Luozhou Precision Bearing Co ltd
Current assignee: Luoyang Luozhou Precision Bearing Co ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2021-04-02
Anticipated expiration: 2030-09-15

Abstract

A multi-row thrust cylindrical roller bearing comprises a seat ring, a shaft ring, cylindrical rollers and a retainer, wherein a plurality of pockets with different lengths are distributed on the retainer in a staggered mode along the radial direction, and one or more cylindrical rollers are placed in the pockets along the radial direction. The cage adopts the pocket layout with different lengths and staggered distribution, breaks the frame limitation and the interval limitation of the existing cage pocket layout, increases the arrangement quantity of the cylindrical rollers to the maximum extent, and improves the bearing load of the bearing. The utility model improves the utilization rate of the roller path, and has the progressive significance that on one hand, the bearing load of each cylindrical roller on the roller path surface is dispersed, and the failure of the roller path surface due to over fatigue is prevented; on the other hand, the stress concentration of the raceway surface between the bearing surface and the non-bearing surface is avoided, so that the service life of the raceway is greatly prolonged. Furthermore, the utility model discloses still solve between cylindrical roller and the pocket hole between the cylindrical roller friction problem, reduced the friction torque of bearing.

Description

Multi-row thrust cylindrical roller bearing

Technical Field

The utility model belongs to the technical field of the bearing technique and specifically relates to a multiseriate thrust cylinder roller bearing is related to.

Background

The cylindrical roller thrust bearing is a rolling bearing for bearing axial load and consists of a race, a shaft ring, cylindrical rollers and a retainer. The thrust roller bearing is classified into a one-way thrust roller bearing and a multi-way thrust roller bearing according to a thrust load direction, or into a single-row thrust roller bearing, a double-row thrust roller bearing and a multi-row thrust roller bearing according to the number of roller rows. The thrust cylindrical roller bearing is mainly applied to low-speed and heavy-load working occasions, such as: screw-down mechanisms of engineering machinery and metallurgical machinery, etc.

Multiseriate thrust cylindrical roller bearing is used for the axial to bear the higher occasion of requirement, generally is biserial thrust cylindrical roller bearing, and a plurality of pocket hole of equipartition on the holder, two are listed as roller diameter unanimity, and length equals or one length and one short staggered distribution, places in the pocket hole of holder. Large and super-huge bearings generally adopt metal solid cages, and the cages also have several structures: a monolithic structure or a two-half combined structure; the pocket holes of the whole structure are milled and processed by adopting square holes, the two half combined structures comprise a retainer seat, a retainer cover, a pin or a screw, and the pocket holes are in cylindrical arc shapes and are drilled and processed.

Because the inner and outer ends of the cylindrical roller have a speed difference, the ratio of the height to the diameter of the cylindrical roller is not suitable to be too large. In the case of using the same cylindrical rollers, the axial load of the thrust cylindrical roller bearing depends on the number of the cylindrical rollers, and the more the cylindrical rollers are arranged, the greater the axial load can be carried. Therefore, more cylindrical rollers are arranged in a limited space as much as possible, and the method is the most effective method for improving the axial bearing load of the thrust cylindrical rollers. The conventional single-row or multi-row thrust cylindrical roller bearing adopts a single-row or multi-row raceway to support cylindrical rollers, so that the utilization rate of the raceway is low on one hand, and the service life of the raceway is short on the other hand. Thus, increasing the utilization of the raceway is also a weight consideration.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the background art, the utility model discloses a multi-row thrust cylindrical roller bearing, which aims to increase the number of the cylindrical rollers and improve the bearing load of the bearing; the utilization rate of the roller path is improved, and the service life of the roller path is prolonged.

In order to realize the purpose, the following technical scheme is adopted:

a multi-row thrust cylindrical roller bearing comprises a seat ring, a shaft ring, cylindrical rollers and a retainer, wherein a plurality of pockets with different lengths are distributed on the retainer in a staggered mode along the radial direction, and one or more cylindrical rollers are placed in the pockets along the radial direction.

As a further improvement of the utility model, the pockets on the retainer are divided into two types, one is a long pocket and the other is a short pocket; at least two cylindrical rollers are arranged in the long pocket along the radial direction, and one cylindrical roller is arranged in the short pocket along the radial direction.

As a further improvement of the utility model, the number of the long pockets is four, and the pockets are distributed in a cross shape; the short pockets are distributed in an inner layer and an outer layer, the outer layer is eight, the inner layer is four, and twelve short pockets are distributed among four long pockets at intervals.

As a further improvement of the utility model, the rolling area of the cylindrical roller in the long pocket hole on the raceway surface and the rolling area of the cylindrical roller in the short pocket hole on the raceway surface are overlapped alternately.

As a further improvement of the utility model, two positioning surfaces are arranged on the retainer, one of the positioning surfaces is in contact positioning with the inner circular surface of the shaft ring, and the other positioning surface is in contact positioning with the raceway surface of the shaft ring.

As a further improvement of the utility model, the shape of the pocket is approximately rectangular, and the over-travel groove is arranged at the vertex angle of the rectangle.

As a further improvement of the utility model, the cylindrical roller is provided with a ball base surface towards one end of the outer diameter of the retainer.

As a further improvement of the utility model, the locking point for preventing the cylindrical roller from falling out is chiseled and printed on the pocket.

Owing to adopt above-mentioned technical scheme, compare the background art, the utility model discloses following beneficial effect has:

the utility model discloses a cage adopts the pocket overall arrangement of different in size, crisscross distribution, has broken frame restriction, the interval restriction of current cage pocket overall arrangement, and furthest has increased cylindrical roller's range quantity, has improved the bearing load of bearing, has creativity.

The utility model improves the utilization rate of the roller path, and has the progressive significance that on one hand, the bearing load of each cylindrical roller on the roller path surface is dispersed, and the failure of the roller path surface due to over fatigue is prevented; on the other hand, the stress concentration of the raceway surface between the bearing surface and the non-bearing surface is avoided, so that the service life of the raceway is greatly prolonged.

Furthermore, the utility model discloses still solve the friction problem between cylindrical roller and the pocket hole and between the cylindrical roller in the pocket hole, reduced the friction torque of bearing.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the distribution of pockets on the cage.

Fig. 3 is a schematic view showing the cylindrical rollers being put into the long and short pockets.

Fig. 4 is a sectional structure diagram of the cage.

Fig. 5 is a schematic view of the cross-sectional structure E-E in fig. 3.

Fig. 6 is a schematic structural view of a cylindrical roller.

In the figure: 1. a seat ring; 2. a shaft ring; 3. a cylindrical roller; 31. a ball base surface; 4. a holder; 41. a long pocket; 42. a short pocket; 43. positioning the surface; 44. and (4) locking points.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. It should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

A multi-row thrust cylindrical roller bearing, as shown in FIG. 1, includes a race 1, an axle ring 2, cylindrical rollers 3, and a cage 4. Because the bearing belongs to a large-scale bearing, the retainer 4 adopts a whole copper alloy circular plate as a matrix of the retainer 4, and the copper alloy matrix has better self-lubricating property and is matched with the cylindrical rollers 3 in a soft and hard way, so that the cylindrical rollers 3 can be better protected.

As shown in fig. 2, a plurality of pockets with different lengths are milled on the base body along the radial direction in a staggered manner, the pockets are approximately rectangular, and the four vertex angles of the rectangle are provided with overrun grooves which are used for clearing the fillets left at the vertex angles of the milling cutter so as to prevent the fillets from interfering with the cylindrical roller 3. In the present embodiment, the pockets on the cage 4 are divided into two types, one being the long pockets 41 and one being the short pockets 42. The number of the long pockets 41 is four, and the pockets are uniformly distributed in four directions, namely, front, rear, left and right. The short pockets 42 are divided into two layers in the radial direction, eight short pockets 42 are provided near the outer layer, and are circumferentially spaced apart from the four long pockets 41; there are four short pockets 42 adjacent the inner layer, again circumferentially spaced. As can be seen from the figure, circles passing through the centers of the outer short pockets 42, the long pockets 41 and the inner short pockets 42 with the center of the cage 4 as a circular dot have different diameters d1, d2 and d 3. The pocket layout with different lengths and staggered distribution breaks the frame limitation and the interval limitation of the existing pocket layout, increases the arrangement quantity of the cylindrical rollers 3 to the maximum extent, and improves the bearing load of the bearing.

As shown in fig. 3, two cylindrical rollers 3 are disposed in the long pocket 41 in the radial direction, and one cylindrical roller 3 is disposed in the short pocket 42 in the radial direction. As can be seen from the figure, the cylindrical rollers 3 inside the long pockets 41 that are close to the outer side have the same rolling area on the raceway surface as the cylindrical rollers 3 inside the outer layer short pockets 42, but the cylindrical rollers 3 inside the long pockets 41 that are close to the inner side have not all the same rolling area on the raceway surface as the cylindrical rollers 3 inside the inner layer short pockets 42. That is, the rolling areas of the two cylindrical rollers 3 in the long pockets 41 on the raceway surface and the rolling areas of the cylindrical rollers 3 in the inner and outer short pockets 42 on the raceway surface are overlapped with each other, so that the effective areas of the raceways are increased as the race 1 and the race 2 supporting the respective cylindrical rollers 3, and the raceway utilization ratio is improved. The bearing load of each cylindrical roller 3 on the raceway surface is dispersed, failure of the raceway surface due to over fatigue is prevented, and stress concentration of the raceway surface between the bearing surface and the non-bearing surface is avoided. As is well known, in the conventional multi-row cylindrical roller thrust 3 bearing, the rolling areas of the roller bearings in each row are a series of concentric circular belts, and the rolling areas do not overlap with each other, so that the failure of the rolling areas due to over fatigue is easily caused because of high concentration of load bearing. On the other hand, the rolling area is a bearing surface, and the adjacent non-rolling area is a non-bearing surface, and a crack is generated at the boundary between the bearing surface and the non-bearing surface due to stress concentration, thereby causing bearing scrap.

In order to position the retainer 4, as shown in fig. 4, two positioning surfaces 43 are provided on the retainer 4, wherein one positioning surface 43 contacts with the inner circumferential surface of the collar 2 to radially position the retainer 4; the other positioning surface 43 is positioned in contact with the raceway surface of the race 2 for axially positioning the cage 4.

In order to prevent the cylindrical rollers 3 from falling out of the short and

long pockets

42 and 41, as shown in fig. 5, after the cylindrical rollers 3 are placed in the pockets, locking points 44 for preventing the cylindrical rollers 3 from falling out are chiseled on the upper and lower surfaces of the pockets.

The rotation of the cylindrical rollers 3 in the short pockets 42 or the long pockets 41, which have both rotation and revolution, generates rotational friction on one end surface of the short pockets 42 or the long pockets 41 near the outer side. The end surfaces of the existing cylindrical rollers 3 are all planes, the friction surfaces of the planes are large, and the resistance moment caused by friction is also large. In order to reduce this resistance torque, the solution is further developed, as shown in fig. 6, in which a ball base surface 31 is provided at an end of the cylindrical roller 3 facing the outer diameter of the cage 4. The ball base surface 31 changes the face-to-face friction of the cylindrical roller 3 with the short pocket 42 or the long pocket 41 into point-to-face friction because the frictional force arm is sharply reduced, thereby greatly reducing the moment of resistance caused by the friction. Another positive aspect is that the cylindrical rollers 3 near the inner side in the long pocket 41 are pressed against the ball base surface 31 on the cylindrical rollers near the outer side on the inner end plane of the cylindrical rollers 3, which can also greatly reduce the friction torque between the two cylindrical rollers 3, and solve the problem of friction between the two cylindrical rollers 3 in the long pocket 41.

It is to be noted that, in the present embodiment, two cylindrical rollers 3 are disposed in the long pocket 41 in the radial direction, but it is not an obstacle to disposing three or more cylindrical rollers 3 in the long pocket 41 in the radial direction, and likewise, two or more cylindrical rollers 3 may be disposed in the short pocket 42 in the radial direction.

The part of the utility model not detailed is prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A multi-row thrust cylindrical roller bearing comprises a seat ring, a shaft ring, cylindrical rollers and a retainer, and is characterized in that a plurality of pockets with different lengths are distributed on the retainer in a staggered mode along the radial direction, and one or more cylindrical rollers are placed in each pocket along the radial direction.

2. The multi-row thrust cylindrical roller bearing of claim 1, wherein: the pockets on the retainer are divided into two types, one is a long pocket and the other is a short pocket; at least two cylindrical rollers are arranged in the long pocket along the radial direction, and one cylindrical roller is arranged in the short pocket along the radial direction.

3. The multi-row thrust cylindrical roller bearing of claim 2, wherein: the number of the long pockets is four, and the long pockets are distributed in a cross shape; the short pockets are distributed in an inner layer and an outer layer, the outer layer is eight, the inner layer is four, and twelve short pockets are distributed among four long pockets at intervals.

4. The multi-row thrust cylindrical roller bearing of claim 2, wherein: the rolling area of the cylindrical roller in the long pocket hole on the raceway surface is overlapped with the rolling area of the cylindrical roller in the short pocket hole on the raceway surface in a crossed manner.

5. The multi-row thrust cylindrical roller bearing of claim 1, wherein: two positioning surfaces are arranged on the retainer, wherein one positioning surface is in contact positioning with the inner circle surface of the shaft ring, and the other positioning surface is in contact positioning with the raceway surface of the shaft ring.

6. The multi-row thrust cylindrical roller bearing of claim 1, wherein: the shape of the pocket is rectangular, and an overtravel groove is arranged at the vertex angle of the rectangle.

7. The multi-row thrust cylindrical roller bearing according to any one of claims 1 to 6, wherein: one end of the cylindrical roller facing the outer diameter of the retainer is provided with a ball base surface.

8. The multi-row thrust cylindrical roller bearing of claim 7, wherein: and locking points for preventing the cylindrical rollers from falling out are chiselled and printed on the pockets.