CN216895362U

CN216895362U - Roller bearing

Info

Publication number: CN216895362U
Application number: CN202122889252.2U
Authority: CN
Inventors: 葛世东; 文小康
Original assignee: Shanghai United Bearing Co ltd
Current assignee: Shanghai United Bearing Co ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-07-05
Anticipated expiration: 2031-11-23

Abstract

A roller bearing includes an outer ring having an outer ring raceway, an inner ring having an inner ring raceway, a plurality of rolling elements disposed between the inner ring raceway and the outer ring raceway, and a cage holding the plurality of rolling elements between the inner ring and the outer ring at intervals. The outer ring raceway is V-shaped, and two side surfaces of the outer ring raceway are straight surfaces or convex cambered surfaces; the inner ring raceway and the outer ring raceway are arranged oppositely, and the shape and the size of the inner ring raceway are the same as those of the outer ring raceway; the rolling body is formed by combining two circular truncated cones together by the lower bottom surfaces of the two circular truncated cones; the side surfaces of the two circular truncated cones of each rolling body are in one-to-one contact with the outer ring raceway and the inner ring raceway; the retainer comprises a retainer ring body and a plurality of partition beams which axially extend from one end face of the retainer ring body and are uniformly distributed along the circumference; the adjacent partition beams and the retainer ring body form rolling body pockets, and two side faces of the end part of each partition beam are provided with locking openings. The roller bearing can bear larger axial force and radial force in two directions.

Description

Roller bearing

Technical Field

The present invention relates to a roller bearing.

Background

The traditional bearing mainly comprises an inner ring, an outer ring, a rolling body and a retainer. The classification according to the type of the rolling element is mainly divided into two categories, namely a ball bearing and a roller bearing. The rolling bodies of the ball bearings are spherical, and the rolling bodies of the roller bearings are of a cylinder, a cone, a drum cylinder and the like. The typical structure is a radial ball bearing, a cylindrical roller bearing, a tapered roller bearing, a spherical roller bearing and a needle bearing.

When the rolling bodies of the bearing are spherical, conical and cylindrical, the main working contact surfaces of the bearing are two point contacts (ball bearings) or two line contacts (roller bearings). For a ball bearing, two point contacts are not enough to ensure complete stability of a steel ball during movement, so that the bearing is easy to spin and slip under high-speed operation, the two-point contact anti-overturning moment capacity of the ball bearing is also insufficient, and under the condition of overturning moment, the anti-overturning moment capacity is improved by adopting bearing pairing generally. The cylindrical roller bearing has a large radial load capacity, but an insufficient axial load capacity. Although the tapered roller bearing can bear radial force and axial force, the tapered roller bearing can only bear unidirectional axial force, and the bearing pair is also required to be used for bidirectional axial force. However, the pair of bearings has a large structural size, and is difficult to apply in the fields of compact space robots and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a roller bearing which can bear larger axial force and radial force in two directions and has the characteristics of strong bearing capacity, good high-speed motion stability, strong anti-overturning moment capacity, small contact load and long service life.

The purpose of the utility model is realized as follows: a roller bearing comprises an outer ring with an outer ring raceway, an inner ring with an inner ring raceway, a plurality of rolling bodies arranged between the inner ring raceway and the outer ring raceway, and a retainer which holds the plurality of rolling bodies at intervals between the inner ring raceway and the outer ring and is uniformly distributed along the circumference; wherein the content of the first and second substances,

the outer ring raceway is V-shaped, and two side surfaces of the outer ring raceway are straight surfaces or convex arc surfaces;

the inner ring raceway and the outer ring raceway are arranged oppositely, and the shape and the size of the inner ring raceway are the same as those of the outer ring raceway;

the rolling body is in a butterfly shape with two pointed ends and a thick middle part and is formed by combining two round tables with the same size by the lower bottom surfaces of the round tables; the outer surface of the rolling body is chamfered by an arc surface at the joint of the two round tables, and the joints of the side surfaces of the two round tables and the respective upper bottom surfaces are chamfered by the arc surfaces; the side surfaces of the two circular truncated cones of each rolling body are in one-to-one contact with the outer ring raceway and the inner ring raceway;

the retainer comprises a retainer ring body in a straight cylinder shape and a plurality of partition beams which axially extend from one end face of the retainer ring body and are uniformly distributed along the circumference; the adjacent distance beams and the retainer ring body form rolling body pockets, and both side surfaces of the end part of each distance beam are provided with locking notches.

In the roller bearing, when both side surfaces of the outer ring raceway and both side surfaces of the inner ring raceway are convex arc surfaces, the side surfaces of the two circular truncated cones of the rolling element are straight surfaces; when the two side surfaces of the outer ring raceway and the two side surfaces of the inner ring raceway are both straight surfaces, the side surfaces of the two circular truncated cones of the rolling body are straight surfaces or convex cambered surfaces.

In the roller bearing, the rolling element pockets of the cage are cylindrical holes whose axes are radial lines of the cage ring body.

In the roller bearing, the root of the outer ring raceway is provided with a rectangular groove to form an outer ring raceway oil storage cavity; the root of the inner ring raceway is also provided with a rectangular groove to form an inner ring raceway oil storage cavity.

The roller bearing of the utility model has the following characteristics:

1. strong bearing capacity and good high-speed motion stability

The rolling body of the utility model adopts a butterfly roller structure, and the raceway of the ferrule adopts a V-shaped straight surface or an outward convex cambered surface, so that the bearing has good stress balance, more contact surfaces than the common bearing, strong bearing capacity, double-sided restraint of the rolling body and the raceway during high-speed motion, and good high-speed stability.

2. Strong anti-overturning moment capacity

Because the rolling bodies in the bearing are in four-surface contact, compared with a two-point contact bearing or a two-surface contact bearing of a common bearing, the contact supporting surface in the bearing is doubled, the supporting stability and the anti-overturning capability are greatly improved, and the high rigidity required by the operation of the bearing can be ensured.

3. The single bearing can bear larger axial force and radial force in two directions simultaneously

The rolling bodies of the traditional bearing are generally in contact with each other at two points or surfaces, a single set of bearing can only bear unidirectional load, the bidirectional load needs to be configured in pairs by two bearings, the roller bearing can bear large bidirectional load by only one bearing, and related mechanical structures can be simplified.

4. The bearing contact load is small and the service life is long under the same mechanical environment

Because the contact surface participating in the support is doubled, the same stress and deformation are borne by multiple surfaces, the contact load and deformation of a single contact surface are reduced, and the roller bearing has smaller contact load and longer service life under the same load compared with a bearing with a common structure.

Drawings

FIG. 1 is a plan view of a roller bearing of the present invention;

FIG. 2 is a view taken along line A-A of FIG. 1;

FIG. 3 is an axial cross-sectional view of the inner race in the roller bearing of the present invention;

FIG. 4 is an axial cross-sectional view of the outer race of the roller bearing of the present invention;

fig. 5 is a perspective view of a rolling element in the roller bearing of the present invention;

FIG. 5a is a plan view of the rolling elements in the roller bearing of the present invention;

FIG. 5B is a view from the B-B direction in FIG. 5 a;

FIG. 6 is a perspective view of a cage in the roller bearing of the present invention;

FIG. 6a is a plan view of a cage in the roller bearing of the present invention;

fig. 6b is a view from direction C-C in fig. 6 a.

Detailed Description

The utility model will be further explained with reference to the drawings.

Referring to fig. 1 to 6b, the roller bearing of the present invention includes an outer ring 1, an inner ring 2, a plurality of rolling elements 3, and a cage 4.

An outer ring raceway 10 is arranged on the inner circumferential surface of the outer ring 1, the outer ring raceway 10 is V-shaped, and two side surfaces of the outer ring raceway 10 are straight surfaces or convex arc surfaces; the root of the outer ring raceway 10 is provided with a rectangular groove 11 to form an outer ring raceway oil storage cavity;

the outer peripheral surface of the inner ring 2 is provided with an inner ring raceway 20, the inner ring raceway 20 is arranged opposite to the outer ring raceway 10, and the shape and the size of the inner ring raceway 20 are the same as those of the outer ring raceway 10; the inner ring raceway 20 is also V-shaped, and both side surfaces of the inner ring raceway 20 are straight surfaces or convex arc surfaces; the root of the inner ring raceway 20 is also provided with a rectangular groove 21 to form an inner ring raceway oil storage cavity;

a plurality of rolling elements 3 are disposed between the inner ring raceway 20 and the outer ring raceway 10; each rolling body 3 is in a butterfly shape with two pointed ends and a thick middle part, the rolling body 3 is formed by combining two round tables 30 with the same size together by the lower bottom surfaces of the round tables, and the included angles between the vertex angle alpha of each round table and the two side surfaces of the outer ring raceway 10 are the same; the outer surface of the rolling body 3 is chamfered by an arc surface at the joint 31 of the two round tables 30, and the joints 32 of the side surfaces of the two round tables 30 and the respective upper bottom surfaces are chamfered by arc surfaces; the diameters of the lower bottom surfaces of the two circular truncated cones 30 are phi L, and the total height of the rolling bodies 3 is L0 which is not more than phi L; the side surfaces of the two circular truncated cones 30 of each rolling body 3 are in one-to-one contact with the two side surfaces of the outer ring raceway 10 and the two side surfaces of the inner ring raceway 10;

the retainer 4 holds a plurality of rolling bodies 3 between the inner ring 2 and the outer ring 1 at intervals and is uniformly distributed along the circumference; the retainer 4 comprises a retainer ring body 40 which is a right cylinder and a plurality of partition beams which axially extend from one end surface of the retainer ring body 40 and are uniformly distributed along the circumference; the adjacent webs and cage ring body 40 form rolling element pockets, and each web 42 has a locking notch 43 on both sides of its end. The rolling bodies 3 are inserted into the rolling body pockets 41 from one end of the cage 4 via the elastically expandable webs 42 and then locked in the rolling bodies 3 via the locking openings 43 of the webs 42, a gap is provided between the rolling bodies 3 and the rolling body pockets 41, and the rolling bodies 3 can freely move radially and axially in the rolling body pockets 41 but cannot move out of the rolling body pockets 41.

According to the roller bearing, the two side faces of the rolling body 3 and the outer ring raceway 10 and the two side faces of the inner ring raceway 10 are in line contact, when the bearing is applied to high rigidity and low speed, the two side faces of the outer ring raceway and the two side faces of the inner ring raceway are both straight faces, and the side faces of two circular truncated cones of the rolling body 3 are also straight faces; when friction torque between the side surfaces of the two circular truncated cones of the rolling element 3 and the two side surfaces of the outer ring raceway 10 and the two side surfaces of the inner ring raceway 10 is required to be a little smaller, the two side surfaces of the outer ring raceway 10 and the two side surfaces of the inner ring raceway 20 are both set to be convex arc surfaces, or the two side surfaces of the outer ring raceway 10 and the two side surfaces of the inner ring raceway 20 are both set to be straight surfaces, but the side surfaces of the two circular truncated cones of the rolling element 3 are set to be convex arc surfaces; the rolling elements 3 in the roller bearing of the present invention are in four surface contact with the outer ring raceway 10 and the inner ring raceway 20 in total. The internal play of the bearing can be selected as positive play or negative play according to requirements, and the assembly mode of the bearing is similar to that of a common ball bearing. Because the rolling bodies 3 are in four-surface contact, the roller bearing of the utility model has two contact surfaces compared with the common bearing, and the internal contact rigidity and the bearing capacity of the roller bearing of the utility model are greatly increased under the same size. Meanwhile, the included angle of the two side surfaces of the outer ring roller path and the included angle of the two side surfaces of the inner ring roller path can be correspondingly adjusted according to the magnitude of the axial force and the radial force. When the radial force is larger, the included angle of the two side surfaces of the outer ring roller path and the included angle of the two side surfaces of the inner ring roller path can be smaller, when the axial force is larger, the included angle of the two side surfaces of the outer ring roller path and the included angle of the two side surfaces of the inner ring roller path can be larger, and the cone angles of the two round tables forming the rolling body are correspondingly adjusted.

The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.

Claims

1. A roller bearing comprises an outer ring with an outer ring raceway, an inner ring with an inner ring raceway, a plurality of rolling bodies arranged between the inner ring raceway and the outer ring raceway, and a retainer which holds the plurality of rolling bodies at intervals between the inner ring raceway and the outer ring and is uniformly distributed along the circumference; it is characterized in that the preparation method is characterized in that,

2. The roller bearing of claim 1, wherein when both side surfaces of the outer ring raceway and both side surfaces of the inner ring raceway are convex arc surfaces, the side surfaces of the two truncated cones of the rolling element are straight surfaces; when the two side surfaces of the outer ring raceway and the two side surfaces of the inner ring raceway are both straight surfaces, the side surfaces of the two circular truncated cones of the rolling body are straight surfaces or convex cambered surfaces.

3. The roller bearing according to claim 1, wherein the rolling element pockets of the cage are cylindrical holes whose axes are radial lines of the cage ring bodies.

4. The roller bearing of claim 1, wherein the root of the outer ring raceway is provided with a rectangular groove to form an outer ring raceway oil storage cavity; the root of the inner ring raceway is also provided with a rectangular groove to form an inner ring raceway oil storage cavity.