Double-row ball thin-walled flexible bearing and harmonic gear reducer

A gear reducer and flexible bearing technology, applied in the field of harmonic transmission, can solve the problems of low radial and axial bending stiffness, low working reliability, short service life, etc., and achieve improved contact conditions, axial and circumferential Effects of increased stiffness and load-carrying capacity and extended service life

CN105156469AActive Publication Date: 2015-12-16NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-12-16

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Abstract

The invention discloses a double-row ball thin-walled flexible bearing and a harmonic gear reducer. The double-row ball thin-walled flexible bearing comprises an outer ring, an inner ring coaxially disposed in the outer ring, an annular integral holder disposed between the outer ring and the inner ring, and rolling elements. Two rows of semicircle-shaped ball socket holes with openings in staggered arrangement are disposed along the outer circumference of the holder, the semicircle-shaped ball socket holes with openings in the same row have the same opening directions and are arrange in a uniformly-spaced manner, the semicircle-shaped ball socket holes with openings in the different rows have the opposite opening directions. The rolling elements are disposed in the ball socket holes of the holder, and are positioned on the arc-shaped raceways on the outer ring and the inner ring. The double-row ball thin-walled flexible bearings sleeve outer walls of the elliptical cams to form a wave generator subassembly. The rigidity in radial and circumferential direction and bearing capability of the harmonic gear reducer are improved, and then the contact status between the rigid and flexible wheels in the working process are improved, and distortion and snapping teeth of the flexible wheel under high overload are avoided, so that the working life of the harmonic gear reducer is prolonged.
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Description

technical field

[0001] The invention relates to the technical field of harmonic transmission, in particular to a double-row ball thin-wall flexible bearing and a harmonic gear reducer. Background technique

[0002] Precision harmonic gear transmission is a high-tech product that emerged with the development of aerospace, rockets, satellites, etc. Due to its advantages of small size, light weight, large transmission ratio, high transmission precision and small hysteresis, it is widely used in automatic control, It has a wide range of applications in mechatronics, numerical control equipment, weapon systems, aerospace, robotics and other fields.

[0003] The flexible bearing is one of the key components in the harmonic gear transmission. The traditional flexible bearing is composed of a single row of balls, thin-walled inner and outer rings and a cage. When it works, the inner and outer rings are constantly changing with the meshing interval of the rigid-flexible wheel. defor...

Examples

Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020]A double-row ball thin-wall flexible bearing, comprising an outer ring 1, an inner ring 2, rolling elements 3 and a cage 4, characterized in that the outer ring 1 and the inner ring 2 are coaxially arranged, and the inner ring 2 is arranged inside the outer ring 1 The width of the outer ring 1 is equal to the width of the inner ring 2. The inner wall of the outer ring 1 is provided with two parallel, symmetrical and equal-width grooves along the circumferential direction as raceways. The outer wall of the inner ring 2 has a Corresponding raceways; there is a cage 4 between the outer ring 1 and the inner ring 2, the cage 4 is an annular cage, and there are two rows of semicircular open ball socket holes along its outer circumference, and the same row of semicircular open balls The opening direction of the socket holes is the same and arranged at equal in...