CN111503136A

CN111503136A - Rolling bearing and retainer thereof

Info

Publication number: CN111503136A
Application number: CN202010269218.2A
Authority: CN
Inventors: 赵圣卿; 苏柏万; 郭向东
Original assignee: Luoyang Bearing Research Institute Co Ltd
Current assignee: Luoyang Bearing Research Institute Co Ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-08-07

Abstract

The invention relates to a rolling bearing and a retainer thereof, which can solve the problem that the existing retainer influences the storage space and normal flow of lubricating grease to cause poor lubricating effect of the bearing. The retainer for the rolling bearing comprises a retainer body, a bearing seat and a bearing seat, wherein the retainer body is annular; a plurality of pairs of ball-locking claws are arranged on the axial side surface of the retainer main body at intervals, and form a pocket with the inner walls of the ball-locking claws or form a pocket with the ball-locking claws and the retainer main body; and the convex rib is arranged between two adjacent ball locking claws of the two adjacent pockets, and two ends of the convex rib are respectively connected with the outer side surfaces of the corresponding ball locking claws. Arrange protruding muscle between the ball locking claw, protruding muscle can take up two adjacent ball locking claws, reduces the deformation of ball locking claw when receiving external force impact, has improved the holistic structural strength of holder, and protruding muscle can enclose into the space of an indent with the annular end face of holder main part, and this space can holding lubricating grease.

Description

Rolling bearing and retainer thereof

Technical Field

The invention relates to a rolling bearing and a retainer thereof.

Background

The bearing is an important part in the modern mechanical equipment, and the main function of the bearing is to support the revolving body, reduce the friction coefficient in the movement process of the revolving body and ensure the revolving precision of the revolving body. The bearings are mainly classified into sliding bearings and rolling bearings according to the contact manner with the revolving body, and the rolling bearings mainly include bearing inner rings, bearing outer rings, rolling bodies arranged between the inner rings and the outer rings, and cages for partitioning the rolling bodies.

As shown in fig. 1 and 2, a conventional cage 01 includes a ring-shaped cage main body, a plurality of pairs of ball-locking claws 02 that are axially protruded from one side are arranged on an annular surface of the cage main body, a spherical space between the two ball-locking claws 02 is a pocket for placing a rolling element 04, and a portion of the cage main body located between two adjacent pockets is a bridge 03 of the cage main body.

Because the inside of the bearing is in a high-temperature state when the bearing rotates at a high speed, the structure of the retainer which generally adopts non-metallic materials can be influenced to a certain extent, and especially when the rolling element 04 drives the retainer 01 to rotate around the axis of the bearing at a high speed, the ball locking claws 02 of the retainer tend to deform radially outwards under the centrifugal action in a high-temperature environment, so that the retainer 01 is in an open state as shown in fig. 2. In order to ensure that the retainer 01 has a good retaining effect on the rolling elements 04, the structural strength of the retainer 01 itself, in particular the structural strength of the ball-locking claws 02 which axially overhang one side, needs to be ensured. The conventional practice is to increase the thickness h of the web 03 to the extent possible to subject the ball-locking claws 02 to the pulling action of the web 03, but this also entails problems. Because can carry out the partial grease of better lubrication action in the orientation lock ball claw overhang one side of pocket hole and lintel to rolling element 04 generally, the thickness of increase lintel will lead to the lubricating grease accommodation space that this side formed to reduce, reduces the reserve volume of this side position lubricating grease, and narrow and small space also can influence the mobility of lubricating grease moreover, leads to the lubricated effect of bearing not good enough on the whole.

Disclosure of Invention

The invention aims to provide a retainer for a rolling bearing, which can solve the problem that the existing retainer influences the storage space and normal flow of lubricating grease to cause poor lubricating effect of the bearing;

the invention also aims to provide a rolling bearing using the retainer, which has the advantage of good lubricating effect.

In order to achieve the above purpose, the cage for rolling bearing of the present invention adopts the following technical solutions:

cage for a rolling bearing comprising:

the retainer body is annular;

a plurality of pairs of ball-locking claws are arranged on the axial side surface of the retainer main body at intervals, and form a pocket with the inner walls of the ball-locking claws or form a pocket with the ball-locking claws and the retainer main body;

and the convex rib is arranged between two adjacent ball locking claws of the two adjacent pockets, and two ends of the convex rib are respectively connected with the outer side surfaces of the corresponding ball locking claws.

The beneficial effects are that: convex ribs are arranged between the ball locking claws and can tension the two adjacent ball locking claws, so that the deformation of the ball locking claws when being impacted by external force is reduced, and the integral structural strength of the retainer is improved; meanwhile, the convex ribs can enclose an inwards concave space with the annular end face of the retainer body, the space can contain lubricating grease, a grease storage space for storing the lubricating grease in the rolling bearing can be increased, in addition, the thickness of the retainer body can be reduced due to the fact that the convex ribs for improving the strength of the retainer are added, more spaces for storing the lubricating grease can be made out of the rolling bearing, and the lubricating capability of the rolling bearing is improved.

Furthermore, the convex rib extends along an arc between the two ball locking claws, and the corresponding circle center of the arc is superposed with the circle center of the retainer body.

The beneficial effects are that: the convex ribs are arc-shaped, force is gentle when the force is transmitted along the convex ribs, stress concentration is reduced, and the structure of the retainer is more stable.

Further, the convex rib is arranged at the edge of the annular end face close to the outer ring.

The beneficial effects are that: the convex ribs are arranged at the outer edge, so that the deformation of the ball locking claw can be better limited when the ball locking claw is turned outwards, and the stability of the retainer is ensured; meanwhile, the convex ribs can limit the lubricating grease to flow outwards, so that the lubricating grease is concentrated at the axis position of the bearing, and the lubricating effect of the rolling body is ensured.

Furthermore, the convex rib and the retainer body are integrally formed.

The beneficial effects are that: the convex rib is of a force bearing structure, and can be integrally formed along with the retainer body, so that the overall strength of the convex rib and the retainer can be ensured, and the stability of the retainer is improved.

Furthermore, the retainer main body is a solid ring body, and the size of the solid ring body in the radial direction is equal to the size of the locking ball claw in the radial direction.

The beneficial effects are that: the retainer main body is of a solid structure and can improve the structural strength by matching with the convex ribs, so that the thickness of the retainer main body can be reduced, more spaces for placing lubricating grease are reserved between the bearing outer ring and the bearing inner ring, and the lubricating effect of the rolling bearing is ensured; the size of the ball locking claw in the radial direction is the same as the corresponding size of the solid ring body, so that the connection area of the ball locking claw and the retainer body can be maximized, and the integral rigidity of the retainer is improved.

Furthermore, a recess is arranged on the inner wall surface of the ball locking claw and used for containing a lubricating medium.

The beneficial effects are that: the ball locking claw is provided with the recess, lubricating grease or lubricating oil can be contained in the recess, the lubricating effect of the rolling bearing is guaranteed, the contact area between the ball locking claw and the rolling body can be reduced, and friction between the rolling body and the ball locking claw is reduced.

Further, the recess is a groove extending along the circumferential direction of the pocket and penetrating through the ball-locking claw in the radial direction of the retainer body.

The beneficial effects are that: the groove is arranged in a penetrating mode, the two ends of the groove are communicated with the annular end face, a channel is provided for circulation of lubricating grease, the gathering amount of the lubricating grease on the annular end face is reduced, the problem of degradation caused by repeated impact and sliding shearing of the lubricating grease by the rolling body is avoided, and the service life of the rolling bearing is prolonged.

Furthermore, two grooves in a pair of ball-locking claws are positioned on the circumference of the same circle.

The beneficial effects are that: the two grooves are positioned on the same circumference, and when the rolling body rotates, the lubricating grease in one groove can be driven to enter the other groove positioned on the same circumference, so that the lubricating grease circulates between the paired ball locking claws, and the lubricating effect is ensured.

In order to achieve the purpose, the rolling bearing adopts the following technical scheme:

rolling bearing, comprising:

a bearing inner race;

a bearing outer race;

the retainer is arranged between the bearing inner ring and the bearing outer ring and is provided with pockets which are arranged in the circumferential direction;

rolling bodies accommodated in the pockets of the cage;

wherein, the holder includes:

the retainer body is annular;

Furthermore, the convex rib and the retainer body are integrally formed.

Drawings

FIG. 1 is a schematic structural diagram of a conventional cage;

FIG. 2 is a schematic view of a conventional cage in an open state;

FIG. 3 is a front view of a cage of embodiment 1 of a rolling bearing of the invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3;

in the figure:

01-a cage; 02-ball locking claw; 03-edge beam; 04-rolling body;

10-a cage; 11-a cage body; 12-ball-locking claws; 13-a groove;

14-a convex rib; 15-ball pits; 16-pocket holes; 20-rolling elements.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the rolling bearing and its cage according to the invention are described in further detail below with reference to the examples.

Embodiment 1 of rolling bearing in the invention: the rolling bearing comprises a bearing outer ring, a bearing inner ring and a rolling part arranged between the bearing inner ring and the bearing outer ring, wherein the rolling part comprises rolling bodies and a retainer, and the rolling bodies are uniformly distributed between the bearing outer ring and the bearing inner ring by virtue of the retainer. The rolling bearing of the present invention is improved mainly by its cage, and the structure of the cage will now be described with emphasis.

As shown in fig. 3, 4 and 5, the cage 10 includes a cage body 11, the cage body 11 is a solid ring body, the cage body 11 has annular end faces facing in the axial direction, i.e., a front ring face and a rear ring face facing in the left-right direction in fig. 3, and the cage body 11 further has an inner circumferential face and an outer circumferential face facing in the radial direction. The cage 10 is provided with a plurality of pockets 16, and the spherical rolling elements 20 are mounted in the pockets 16 of the cage 10, the pockets 16 being located on a front circumferential surface of the cage body 11.

In this embodiment, a plurality of pairs of ball-locking claws 12 are convexly provided on the front annular surface of the cage main body 11, and the size of the ball-locking claws 12 in the radial direction is the same as the radial size of the cage main body 11. The thickness of the overhanging portion of the ball detent 12 away from the front annulus is less than the thickness of the root portion near the front annulus. The part of the front ring surface between each pair of ball-locking claws 12 is a concave ball pit 15, the inner wall surface of the other one of each pair of ball-locking claws 12 facing each other is a partial spherical surface and is connected with the ball pit 15, and a pocket 16 is enclosed by the inner wall surface of the ball-locking claw 12 and the ball pit 15 on the front ring surface of the retainer body 11.

Still be provided with the protruding muscle 14 along with holder main part 11 integrated into one piece on the preceding anchor ring face of holder main part 11, protruding muscle 14 is located between two adjacent ball-locking claws 12 of two adjacent pockets 16, arranges promptly between adjacent and different ball-locking claws 12 to, and the both ends of protruding muscle 14 are connected with two ball-locking claw 12 outer wall surfaces that correspond, can receive the tight ball-locking claw 12 of centrifugal force tensioning at ball-locking claw 12, reduce and warp. And because the convex rib 14 is additionally arranged between the two ball-locking claws 12, the stability of the retainer under the action of external force can be enhanced, and technicians can correspondingly reduce the thickness Hg of the boundary beam between the two ball-locking claws 12 and leave more space for placing lubricating grease in the rolling bearing.

The convex rib 14 extends along the arc line to form an arc section, and the circle center corresponding to the arc convex rib 14 is overlapped with the circle center of the holder main body 11. In addition, in the radial direction of the cage main body 11, a bead 14 is arranged at the outer edge of the front ring surface, and the outer side edge of the bead 14 coincides with the outer edge of the front ring surface. The convex rib 14 is convexly arranged on the front ring surface and connected with the outer side surface of the ball locking claw 12, and a space capable of storing lubricating grease is formed at the front ring surface.

On the inner wall surfaces of each pair of ball-locking claws 12 facing each other, there is also provided a groove 13 as a depression, the groove depth h of the groove 13 can be taken from 0-0.5mm, the groove depth h of the groove 13 in this embodiment is 0.25 mm. Grease serving as a lubricating medium can be stored in the grooves 13, and the contact area between the rolling elements 20 and the ball-locking claws 12 is reduced, thereby reducing friction. In the pair of ball-locking claws 12, the grooves 13 on the two ball-locking claws 12 are located on the same circumference, and the circumference corresponding to the groove 13 is parallel to the retainer body 11 of the ring body. In this embodiment, the groove 13 on the ball-locking claw 12 is a through groove, and two ends of the groove 13 penetrate through the ball-locking claw 12 in the radial direction of the holder body, so that the lubricating grease can conveniently flow inside and outside the groove 13.

The rolling bearing in the present invention is not limited to the one provided in embodiment 1, and the one provided in the following embodiment may also be adopted.

Embodiment 2 of rolling bearing in the invention: the difference from the above embodiment is that in this embodiment, the retainer includes an annular retainer body, a plurality of pairs of ball-locking claws with C-shaped cross sections are arranged at intervals on an annular end surface of the retainer body, pockets are defined by inner walls of the ball-locking claws, and the retainer body is used as a carrier to support the ball-locking claws and is not limited to the scheme that the ball-locking claws and the retainer body define the pockets together.

Embodiment 3 of rolling bearing in the invention: the difference from the above embodiment is that in this embodiment, the rib extends along a straight line, that is, the projection of the rib on the annular end surface of the holder main body is a straight line segment, and the rib extending along an arc line is not limited to be used. In other embodiments, the rib still extends along the arc line, and the center of the circle corresponding to the rib is slightly misaligned with the center of the circle corresponding to the holder body.

Embodiment 4 of rolling bearing in the invention: the difference from the above embodiment is that in this embodiment, the rib extends along an arc between the two ball-locking claws, the corresponding center of the arc coincides with the center of the retainer body, and the rib is disposed at the edge of the annular end surface close to the inner ring. In other embodiments, the rib may be disposed at a position intermediate between the inner ring edge and the outer ring edge of the annular end surface, and the rib may be divided into two grease storage spaces near the inner ring edge and near the outer ring edge at the annular end surface.

Embodiment 5 of rolling bearing in the invention: the difference from the above embodiment is that in this embodiment, the cage is made of a metal material, and the rib thereof is made separately from the cage body and then fixed between two adjacent ball-locking claws of two adjacent pockets by welding.

Embodiment 6 of rolling bearing in the invention: the difference from the above embodiment is that in this embodiment, the retainer body is still a solid ring body, pairs of ball-locking claws are arranged on the annular end surface of the solid ring body, and the size of each ball-locking claw in the radial direction of the retainer body is slightly smaller than that of the retainer body in the radial direction. When the ball locking claws are fixed on the retainer body in a welding mode, the size of the ball locking claws can be slightly larger than that of the retainer body to be welded in the radial direction. In other embodiments, the side of the cage body facing away from the ball-locking claws may be a thin-walled shell structure as shown in fig. 1 and 2, and is not limited to a solid ring.

Embodiment 7 of rolling bearing in the invention: the difference from the above embodiment is that, in this embodiment, the recess provided on the inner wall surface of the ball-locking claw is a ball pit, and the diameter of the ball pit corresponding to the spherical space is smaller than the diameter of the spherical pocket surrounded by the ball-locking claw. In other embodiments, the recess in the ball-locking claw may be a counter bore or a closed groove, the groove may be a straight shape or a cross shape, or after the rolling element is installed in the pocket, a relatively large gap may be formed between the rolling element and the pocket, and the ball-locking claw may not be provided with the recess.

Embodiment 8 of rolling bearing in the invention: the difference from the above embodiment is that, in the present embodiment, the grooves on the inner wall surfaces of the pair of ball-locking claws are through grooves, and the two through grooves are staggered along the overhanging direction of the ball-locking claw, that is, the two through grooves are in a high-low state.

The structure of the cage in the present invention is the same as that of the cage in the above-described rolling bearing embodiment, and therefore, description about the embodiment of the cage will not be repeated.

The above-mentioned embodiments, the objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. Cage for a rolling bearing comprising:

the retainer body is annular;

it is characterized by also comprising:

2. Cage for a rolling bearing according to claim 1, characterized in that the rib extends between the two ball-locking claws along an arc whose corresponding centre coincides with the centre of the cage body.

3. Cage for a rolling bearing according to claim 2, characterized in that the ribs are arranged at the edge of the annular end face close to the outer ring.

4. A cage for a rolling bearing according to claim 1, 2 or 3 wherein the ribs are integrally formed with the cage body.

5. A cage for a rolling bearing according to claim 1, 2 or 3 wherein the cage body is a solid ring body having a dimension in a radial direction equal to a dimension of the locking claws in the radial direction.

6. The cage for a rolling bearing according to claim 1, 2 or 3, wherein a recess is provided on an inner wall surface of the ball-locking claw for accommodating a lubricating medium.

7. The cage for a rolling bearing according to claim 6, wherein the recess is a groove extending in a circumferential direction of the pocket and penetrating the ball-locking claw in a radial direction of the cage main body.

8. A cage for a rolling bearing according to claim 7 wherein the two recesses in a pair of ball-locking pawls are located on the circumference of the same circle.

9. Rolling bearing, comprising:

a bearing inner race;

a bearing outer race;

rolling bodies accommodated in the pockets of the cage;

it is characterized in that the preparation method is characterized in that,

the cage is a cage for a rolling bearing according to any one of claims 1 to 8 above.