CN201347975Y

CN201347975Y - Combination bearing

Info

Publication number: CN201347975Y
Application number: CNU2008202322071U
Authority: CN
Inventors: 李连鹏; 陶淑媛; 李连宙; 王震江; 刘勇; 邓爱秋; 陈维秀
Original assignee: Wafangdian Pengdong Bearing Manufacturing Co Ltd
Current assignee: Wafangdian Pengdong Bearing Manufacturing Co Ltd
Priority date: 2008-12-26
Filing date: 2008-12-26
Publication date: 2009-11-18
Anticipated expiration: 2018-12-26

Abstract

The utility model discloses a combination bearing, which comprises an upper shaft washer (1), a roller (2), a middle shaft washer (3), a steel ball (5), a seat ring (6) and retainers, wherein the cylindrical roller (2) is arranged between the upper shaft washer (1) and the middle shaft washer (3 ), the cylindrical roller is held in a first retainer (4), steel ball rollers are installed between the middle shaft washer (3) and the seat ring (6), the steel ball rollers are held in a second retainer (7), and the retainers are both closed brass solid retainers. The combination bearing can play a certain of aligning effect under the work state, improves the strength and the wear resistance of the retainers, and increases two times of axial carrying capacity.

Description

Combined bearing

Technical Field

The invention relates to a combined bearing provided with two sets of rolling bodies.

Background

In the prior art, the bidirectional thrust angular contact ball bearing mainly has the problems that dynamic and static loads of radial thrust to be borne are low, the rotating flexibility of a steel ball is influenced by the heavy weight of a closed retainer, the lubricating performance of the bearing is poor and the like, and the requirements of drilling equipment cannot be met.

Disclosure of Invention

The invention aims to provide a bidirectional thrust combined bearing which has high bearing capacity, good lubricating performance and certain axial action compared with a bidirectional thrust angular contact ball bearing.

The invention constructs a combined bearing which comprises two sets of rolling element assemblies which are overlapped up and down. The first set of rolling element assembly positioned at the upper part comprises an upper shaft ring at the upper part, a middle shaft ring at the lower part and a cylindrical roller between the upper shaft ring and the middle shaft ring; the cylindrical roller is retained in position by a first retainer. The second set of rolling element assembly positioned at the lower part comprises the middle shaft ring, a race ring at the lowest part and a steel ball roller between the middle shaft ring and the race ring; the steel ball rollers are limited in position by the second retainer.

The combined bearing is improved in that the diameter of the seat ring is smaller than that of the upper shaft ring and the middle shaft ring. In addition, the first retainer and the second retainer are preferably closed solid brass retainers. The invention has the advantages that under the condition of unchanging the external dimension, the upper part of the thrust angular contact ball bearing is changed into a thrust cylindrical bearing structure, and the thrust angular contact ball bearing at the lower part is unchanged, so that a certain aligning effect can be achieved in the working state; the holder adopts a brass solid closed structure, which is beneficial to improving the strength and the wear resistance of the holder, and the axial bearing capacity of the bidirectional thrust combined bearing is improved by two times.

Drawings

FIG. 1 is a schematic view of a half-section structure of a bearing according to the present invention.

Detailed Description

The combined bearing shown in figure 1 comprises two sets of rolling element assemblies stacked one above the other. The first set of rolling element assembly comprises an upper shaft ring 1 at the upper part, a middle shaft ring 3 at the lower part and a cylindrical roller 2 between the upper shaft ring 1 and the middle shaft ring 3; the cylindrical roller 2 is defined in position by a first cage 4. The second set of rolling element assemblies comprises a middle shaft ring 3, a lowest seat ring 6 and a steel ball roller 5 between the middle shaft ring 3 and the seat ring 6; the ball rollers 5 are position-limited by a second cage 7. Furthermore, the diameter of the race 6 is preferably smaller than the diameters of the upper and middle races 1, 3. The central race 3 and the raceway 6 are provided with raceways for the steel ball rollers 5, respectively. Also preferably, the first holder 4 and the second holder 7 are preferably closed solid holders of brass.

Claims

1. A combined bearing is characterized by comprising two sets of rolling element assemblies which are overlapped up and down; wherein,

the first set of rolling element assembly comprises an upper shaft ring (1) at the upper part, a middle shaft ring (3) at the lower part and a cylindrical roller (2) between the upper shaft ring (1) and the middle shaft ring (3); the cylindrical roller (2) is limited in position by a first retainer (4);

the second set of rolling element assembly comprises the middle shaft ring (3), a lowest race ring (6) and a steel ball roller (5) between the middle shaft ring (3) and the race ring (6); the steel ball rollers (5) are limited in position by a second retainer (7).

2. Combination bearing according to claim 1, wherein the diameter of the raceway (6) is smaller than the diameters of the upper (1) and middle (3) races.

3. Combination bearing according to claim 1, wherein the first cage (4) and the second cage (7) are closed solid cages of brass.