CN201314336Y

CN201314336Y - High rotation velocity low noise motor precise bearing

Info

Publication number: CN201314336Y
Application number: CNU2008200117227U
Authority: CN
Inventors: 何春达
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-25
Filing date: 2008-03-25
Publication date: 2009-09-23
Anticipated expiration: 2018-03-25

Abstract

The utility model relates to a high rotation velocity low noise motor precise bearing, which is characterized in that the appearance of the bearing is similar to that of the ordinary bearing; the bearing mainly comprises an outer ring, an inner ring, a cylindrical roller and a retainer. The quantity of the bearing outer ring is one, and the bearing outer ring is integrally designed; an inner ring is arranged inside the bearing outer ring, and the inner ring is provided with a single flange; the retainer is arranged between the inner and the outer rings, and both ends of the retainer present in an arc shape and are integrally closed; and a single row of cylindrical rollers on the retainer consists of 14 rollers. The high rotation velocity low noise motor precise bearing improves the limit rotation velocity of the motor bearing and the turning quality and the turning precision of the entire bearing, and eliminates the unfavorable elements influencing the turning of the bearing caused by the non-reasonability of the retainer structure, and reduces the noise and the vibration value of the motor bearing.

Description

High rotating speed low noise motor precision bearing

Technical field

The utility model relates to the development of high rotating speed low noise motor precision bearing of a kind of special retainer structure of field of bearings

Background technique

Motor is the core of all lathe transferring power, motor is also more and more higher to the requirement of bearing, according to different equipment, motor requires the precision difference of bearing, general bearing can reach the Z1 group, reach Z2 group, Z3 group difficulty is very big, Z4 organizes above motor bearings needs bigger technology input, difficulty is very big.The motor bearings model of this project invention is NJ322EMA, and design characteristic is to reduce the rolling element damping, improves the motor bearings rotating speed.Under high speed conditions, produce rolling element damping position according to bearing, the retainer window structure is improved.This class motor bearings of using comprises bearing inner race, rolling element and bearing outer ring, retainer at present.Belong to common shape, i.e. bearing outer ring raceway linearly, inner ring also is the straight line raceway, and the distance of interior raceway and outer raceway equals the rolling return radius, the ball journal of this structure only can bear radial load, can not bear thrust load.The rotating speed of this ordinary construction bearing is difficult to bring up to 7000-8000 to be changeed.On many special devices with specific (special) requirements, existing ball bearing can't satisfy the requirement of above equipment.For overcoming the not high defective of above roller bearing rotating speed, must improve design to roller-mill bearing.

High rotating speed precision electric motor bearing is different from common use bearing, must guarantee that bearing must guarantee long lifetime, low coefficient of friction, performances such as high self lubricity, high rotating speed use in the usage requirement of precision machine tool, the high rotating speed of precision type instrument, low noise.General axis is accepted insurance and is not demonstrate,proved usage requirement, domestic most of imported bearing that adopts.This project is the production domesticization research achievement.

Summary of the invention

The purpose of this utility model provides a kind of high rotating speed low noise motor precision bearing

The bearing outward appearance is similar substantially with plain bearing, and the critical piece of bearing is made up of outer ring, inner ring, cylindrical roller, retainer.One of bearing outer ring is arranged, and bearing outer ring is global design; The interior setting is equipped with one of inner ring, and inner ring is made as single block border; Be provided with between inner ring and the outer ring one of retainer is installed, retainer fenestra two ends are circular shape, one sealing retainer structure; Single-row cylinder roller totally 14 formations on the retainer adopt known technology to assemble.

Described high rotating speed low-noise accurate motor bearings has changed original bearing cage structure, by original separated type two body rivet type retainer structures, changes one sealing retainer structure into.This one retainer structure has been cancelled two body rivets and has been connected, and prevents in the bearing using process rivet breakage problem.In the design of retainer pocket hole, according to routine motor bearings Failure analysis up to a hundred, spot failure is all at retainer fenestra two ends root, so Transform Type design becomes retainer fenestra two ends to be circular shape simultaneously.

In addition because the Position Design of two body retainers is integral retainer, the space is strengthened, can be big the intensity of retainer design, improved high rotating speed low-noise accurate motor can reach 6000-7000 rev/min with the high-speed precision bearing limit speed, has improved 2 times more than than original 2000-3000 rev/min.Working life is also than original raising 25%.Rotating mass and rotating accuracy are higher than conventional bearing.

Mounting type is identical with original selfaligning roller bearing, and bearing outer ring is global design, is convenient to the client and by former mode bearing is maintained.Inner ring is made as single block border, can be general.Difficulty of processing is big, but installs and uses more convenient.

The main inventive point of the utility model is: because retainer is designed to the one enclosed construction, retainer fenestra two end sections are circular arc and connect, improved motor bearings in the process of running up, the smoothness of rolling element rotation and revolution, reduce damping, thereby improved the rotating speed of bearing, reduced noise, also improve 25% the working life of motor bearings.

The utility model has following advantage compared to existing technology:

Can improve speed motor bearing limit speed; Improved the rotating mass and the rotating accuracy of whole bearing, eliminated owing to the structural unreasonable rotating unfavorable factor of bearing that influences of retainer; Improved the working life of whole bearing; Reduce the noise and the vibration values of motor bearings.The high speed of special equipment spindle speed such as lathe, precision type instrument, steady, low noise operation have been guaranteed, the vibrations of reduction equipment under the state of running up.

Description of drawings

Fig. 1 is the utility model simplified schematic diagram

Fig. 2 is the utility model bearing outer ring simplified schematic diagram

Fig. 3 is the utility model bearing inner race simplified schematic diagram

Fig. 4 is the utility model bearing roller simplified schematic diagram

Fig. 5 is the utility model retainer side simplified schematic diagram

Fig. 6 is the utility model retainer side simplified schematic diagram

Fig. 7 is that simplified schematic diagram is amplified by the utility model inner ring portion of residence

Embodiment

Embodiment: in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, high rotating speed low noise motor precision bearing simplified schematic diagram shown in Figure 7, have 1 one of bearing outer rings, 2 one of bearing inner races, 14 of bearing rollers 3 (each roller Φ 34mm x 34mm), retainer one cover 4 to form, the employing known technology connects and assembles; The 2-1 enlarged view that the bearing inner race part is wherein arranged, the profile 4-1 of retainer.

The setting rated load is CR=458KN:COR=534kn.

Radial internal clearance 0.06-0.10 (C4); Outer ring 1 raceway is packed into: cylindrical roller 3 back two interior fourth contact diameter phase mutual deviations should be less than 0.010mm; Outer ring 1 external diameter is less than 0.008mm; Two raceway diameters are less than 0.012mm, and the joint of raceway and grinding undercut does not allow cusped edge and burr; The difference 0.012mm of raceway two ends average diameter; Respectively there are 14 sealed pocket holes both sides on retainer 4 circumference.

Claims

1, a kind of high rotating speed low noise motor precision bearing, it is characterized in that: the bearing outward appearance is similar substantially with plain bearing, and the critical piece of bearing is made up of outer ring, inner ring, cylindrical roller, retainer, and one of bearing outer ring is arranged, and bearing outer ring is global design; The interior setting is equipped with one of inner ring, and inner ring is made as single block border; Be provided with between inner ring and the outer ring one of retainer is installed, retainer fenestra two ends are circular shape, one sealing retainer structure; Totally 14 assemblings of single-row cylinder roller on the retainer constitutes.