CN104776121A

CN104776121A - Low-torque high-rigidity combined bearing

Info

Publication number: CN104776121A
Application number: CN201510169752.5A
Authority: CN
Inventors: 周琳; 王小刚; 陈明育; 张彦合; 张佳; 张晓杨
Original assignee: Luoyang LYC Bearing Co Ltd
Current assignee: Luoyang LYC Bearing Co Ltd
Priority date: 2015-04-13
Filing date: 2015-04-13
Publication date: 2015-07-15

Abstract

The invention belongs to the technical field of turntable combined rolling bearing and discloses a low-torque high-rigidity combined bearing. The bearing is of a combined structure of an axial thrust ball (4) and a radial roller (6); the radial thrust ball (4) is of a structure of at least three rows of dense balls; roller paths in a first inner ring (2), a second inner ring (3) and an outer ring (1) are straight roller paths and are matched with the axial trust ball (4); a bearing retainer (5) corresponding to each row of axial thrust balls (4) is arranged; the pocket matched with the axial thrust ball (4) in the bearing retainer is a straight pocket; a support step is formed in the loop surface of the bearing retainer; arc notches are formed in both the bearing step and the inner diameter guide surface of each bearing retainer; a radial retainer (7) is arranged in a manner of corresponding to the radial roller (6). The rotating speed of the bearing is increased and the requirements of low friction torque and high rigidity; precision and stability of the combined bearing are met.

Description

A kind of low moment of torsion height stiff assembly bearing

Technical field

The invention belongs to turntable compound rolling bearing technical field, relate generally to a kind of low moment of torsion height stiff assembly bearing.

Background technique

At present, the high-accuracy bearing of combined loading can be born, usually have two kinds of structures, be respectively three-row roller combination thrust-bearing (YRT structure) and double angular contact thrust ball bearing (ZKLDF structure), these two kinds of bearings are mainly used in the equipment such as high precision machine tool, radar base and medical equipment; Although two kinds of airframe bearings can obtain very high precision, also Shortcomings.As shown in Figure 1, wherein YRT airframe bearing is linear contact lay, and its axial roller also exists inevitable slip because of inside and outside speed difference, radial roller is full complement, also there is larger friction between radial roller, therefore bearing integral friction torque is large, is not suitable at a high speed and the occasion of low moment of torsion; As shown in Figure 2, although and ZKLDF airframe bearing is point cantact, friction torque is little, and rigidity is slightly poor, and difficulty of processing is large, not easily obtains higher precision; The requirement of the high rigidity proposed for the equipment such as telescope, test stand, test instrument, highi degree of accuracy, low torque, high stationarity, the bearing of these two kinds of structures all can not meet simultaneously.

Summary of the invention

The object of the invention is to propose a kind of low moment of torsion height stiff assembly bearing, the requirement of the low friction moment of combination bearing, high rigidity, highi degree of accuracy and high stationarity can be met.

The present invention takes following technological scheme for completing above-mentioned purpose:

A kind of low moment of torsion height stiff assembly bearing, described combination bearing is the structure that end thrust ball and radial roller combine, in order to bear bidirectional axial force, radial force and tilting moment, for axle system provides axis and radial location simultaneously; Described end thrust ball is between the first inner ring and outer ring, between the second inner ring and outer ring; Described end thrust ball is the close pearl structure of at least three rows, and adjacent two row's end thrust balls are in radial direction interlaced arrangement, end thrust ball adopts the close pearl structure of at least three rows to bear axial force, makes the good rigidly of bearing, easy acquisition highi degree of accuracy, and process easy; The raceway that the first described inner ring, the second inner ring and outer ring coordinate with end thrust ball is straight raceway, effectively reduces friction torque, improves the rotating speed of bearing; Correspondence is often arranged end thrust ball and is provided with retainer, the pocket hole that described retainer coordinates with end thrust ball is straight pocket hole, reduce the area of contact between end thrust ball and retainer, thus reduce the friction between end thrust ball and retainer; The structural design of multiple retainer, increases the rigidity of bearing while improving bearing capacity; The ring surface of described axial cage has supporting step, on described supporting step, the internal diameter guide surface of axial cage all has arc notch, in order to reduce axial cage and outer ring, area of contact between the first inner ring and the second inner ring, reach loss of weight and reduce the effect rubbed; Radial roller described in correspondence is provided with radial retainer, reduces the friction between radial roller, improves the rotating speed of bearing.

Feature, bearing rigidity is good, easily obtains highi degree of accuracy, processes easy; The upper pocket hole on the one hand of axial cage design adopts straight pocket hole, and straight pocket hole reduces the area of contact between steel ball and retainer compared with arc pocket hole, can reduce friction between the two like this.Arc notch is increased on the other hand, to reduce the area of contact between retainer and lasso, to reach loss of weight and to reduce the effect rubbed on supporting step and guide surface; Radial cylindrical roller increases retainer, can reduce the friction between roller, improves the rotating speed of bearing.

The one low moment of torsion height stiffness combine bearing that the present invention proposes, solve conventional turntable bearing low friction moment, problem that highi degree of accuracy, high rotating speed, high rigidity cannot be taken into account simultaneously, reduce the friction torque of bearing, ensure that the rigidity of bearing simultaneously, be applicable to the two-way positioning bearing of low friction moment height rigid requirements.

Accompanying drawing explanation

Fig. 1 is turntable bearing YRT structural representation.

Fig. 2 is turntable bearing ZDLKF structural representation

Fig. 3 is structural representation of the present invention.

Fig. 4 is the arrange diagram of axial thrust ball in the present invention.

Fig. 5 is axial cage plan view in the present invention.

In figure; 1, outer ring, the 2, first inner ring, the 3, second inner ring, 4, axial steel ball, 5, axial cage, 6, radial roller, 7, radial retainer, 8, attachment bolt, 9, axial roller, 10, supporting step, 11, internal diameter guide surface, 12, arc notch.

Embodiment

With specific embodiment, the present invention is illustrated by reference to the accompanying drawings:

As shown in Figure 3, Figure 4, a kind of low moment of torsion height stiff assembly bearing, described combination bearing is the structure that end thrust ball 4 combines with radial roller 6, in order to bear bidirectional axial force, radial force and tilting moment, for axle system provides axis and radial location simultaneously; Described end thrust ball 4 is between the first inner ring 2 and outer ring 1, between the second inner ring 3 and outer ring 1; Described end thrust ball 4 is the close pearl structure of three rows, and adjacent two row's end thrust balls 4 are in radial direction interlaced arrangement, and end thrust ball 4 adopts the close pearl structure of three rows to bear axial force, makes the good rigidly of bearing, easily obtains highi degree of accuracy, and process easy; The raceway that the first described inner ring 2, second inner ring 3 and outer ring 1 coordinate with end thrust ball 4 is straight raceway, significantly reduces friction torque, improves the rotating speed of bearing; Correspondence is often arranged end thrust ball 4 and is provided with retainer 5, the pocket hole that described retainer 5 coordinates with end thrust ball 4 is straight pocket hole, reduce the area of contact between end thrust ball 4 and retainer 5, thus reduce the friction between end thrust ball 4 and retainer 5; The structural design of multiple retainer 5, increases the rigidity of bearing while improving bearing capacity; As shown in Figure 5, the ring surface of described axial cage 5 has supporting step 10, on described supporting step 10, the internal diameter guide surface 11 of axial cage all has arc notch 12, in order to reduce axial cage and outer ring, area of contact between the first inner ring and the second inner ring, reach loss of weight and reduce the effect rubbed; In order to reduce axial cage 5 and the area of contact between outer ring 1, first inner ring 2 and the second inner ring 3, reach loss of weight and reduce the effect rubbed; Radial roller 6 described in correspondence is provided with radial retainer 7, reduces the friction between radial roller 6, improves the rotating speed of bearing, and the material of radial retainer adopts nylon 1010-HG2-869.

Claims

1. a low moment of torsion height stiff assembly bearing, described combination bearing is the structure that end thrust ball (4) combines with radial roller (6), in order to bear bidirectional axial force, radial force and tilting moment, for axle system provides axis and radial location simultaneously; Described end thrust ball (4) is positioned between the first inner ring (2) and outer ring (1), between the second inner ring (3) and outer ring (1); Described end thrust ball (4) is the close pearl structure of at least three rows, and adjacent two row's end thrust balls are in radial direction interlaced arrangement, end thrust ball (4) adopts the close pearl structure of at least three rows to bear axial force, makes the good rigidly of bearing, easy acquisition highi degree of accuracy, and process easy; Described the first inner ring (2), the second inner ring (3) and outer ring (1) upper raceway coordinated with end thrust ball (4) are straight raceway, effectively reduce friction torque, improve the rotating speed of bearing; Correspondence is often arranged end thrust ball (4) and is provided with retainer (5), the upper pocket hole coordinated with end thrust ball (4) of described retainer (5) is straight pocket hole, reduce the area of contact between end thrust ball and retainer, thus reduce the friction between end thrust ball and retainer; The structural design of multiple retainer, increases the rigidity of bearing while improving bearing capacity; The ring surface of described axial cage (5) has supporting step (10), described supporting step (10) is upper, the internal diameter guide surface (11) of axial cage (5) all has arc notch (12), in order to reduce axial cage and outer ring (1), area of contact between the first inner ring (2) and the second inner ring (3), reach loss of weight and reduce the effect rubbed; Radial roller (6) described in correspondence is provided with radial retainer (7), reduces the friction between radial roller (6), improves the rotating speed of bearing.