CN106838266B

CN106838266B - Bearing speed reducer retainer

Info

Publication number: CN106838266B
Application number: CN201710220191.6A
Authority: CN
Inventors: 李亚明
Original assignee: Chongqing Kegu Machinery Co ltd
Current assignee: Chongqing Kegu Machinery Co ltd
Priority date: 2017-04-06
Filing date: 2017-04-06
Publication date: 2023-02-03
Anticipated expiration: 2037-04-06
Also published as: CN106838266A

Abstract

The invention discloses a bearing speed reducer retainer in the field of mechanical transmission, which comprises an input ring, a mounting ring and an output ring which are sequentially distributed from top to bottom; the outer side wall of the input ring is provided with a plurality of clamping grooves which are uniformly distributed in a circular shape, and the outer side wall of the input ring between every two adjacent clamping grooves is fixedly connected with a retaining plate; the mounting ring is positioned on the outer side of the input ring; the bottom of the output ring is provided with a plurality of connecting holes. The retainer of the scheme can effectively limit the roller of the bearing speed reducer, and meanwhile, the load of the bearing speed reducer is uniformly distributed on the roller and the retainer, so that the bearing speed reducer is more uniformly stressed and can bear larger load.

Description

Bearing speed reducer retainer

Technical Field

The invention relates to the field of mechanical transmission, in particular to a bearing reducer retainer.

Background

At present, two types of speed reducers are mainly used in the field of robots, one is a Rotate Vector speed reducer (RV speed reducer for short) of Nabtesco emperor-machine company in Japan, and the other is a Harmonic speed reducer of Harmonic Drive in Japan, which almost monopolize the speed reducer for the robots all over the world. In a robot joint, since an RV reducer has higher rigidity and slewing accuracy, the RV reducer is generally placed at a heavy-load position such as a base, a boom, a shoulder, or the like, while a harmonic reducer is placed at a small arm, a wrist, or a hand.

The transmission of the harmonic reducer is to realize rotating speed conversion and power transmission through radial elastic deformation of the thin-wall flexible gear, the bearing capacity and the transmission rigidity of the thin-wall flexible gear are relatively low, and meanwhile, the flexible gear is easy to generate fatigue damage due to periodic deformation, so the harmonic reducer is mainly used for a medium-and-light-load precision transmission system and is mainly used for precision speed reduction transmission of wrists and hands of industrial robots.

The RV reducer is formed by compounding primary involute cylindrical planetary gear transmission and primary cycloid pinwheel planetary transmission. The structural design is characterized in that: after power is input by the driving pinion, three rotating arms are driven by three planetary gears which are uniformly distributed in the circumferential direction to synchronously drive two cycloidal gears which are arranged in an eccentric mode by 180 degrees, multiple tooth difference meshing is formed between the cycloidal gears and the needle teeth, and the generated output torque is output by the rotating speed output mechanism. The RV reducer has the advantages of compact structure, large transmission ratio, strong bearing capacity, high transmission rigidity and the like. However, the basic structure of RV remains deficient. On one hand, because of the adoption of involute gear transmission, tooth surface gluing is often generated due to the reasons of few contact teeth, large tooth surface acting force, large tooth surface relative sliding speed and the like, so that tooth shapes are abraded, poor meshing is caused, excessive friction and abrasion exist among the tooth shapes, and the problems of noise, heating and the like are generated; on the other hand, because the cycloid gear and the needle teeth are meshed by multiple tooth differences, the number of the same meshing teeth is more than that of the same meshing teeth under the condition of single tooth difference meshing, but the same meshing state is not achieved, so that a gap exists between part of the needle teeth and the outline of the cycloid gear in the meshing process, sliding friction is easy to generate between the needle teeth and the cycloid gear during meshing, the needle teeth and the cycloid gear can be seriously abraded after long-term operation, noise and heating phenomena are generated, and the reducer is failed and scrapped when the gear is serious.

The speed reducer adopting the bearing balls is provided, the multi-stage balls are adopted for carrying out rotating speed conversion and power transmission, the speed reducer comprises an eccentric wheel, an inner row of rollers, a bearing ring, an outer row of rollers and a central wheel shell, the problems of abrasion, noise, heating and the like are improved by adopting full meshing and pure rolling, the balls are required to be limited and kept, meanwhile, enough radial and axial loads can be borne by the balls, and the ball retainer for the bearing speed reducer with the effect is urgently needed.

Disclosure of Invention

The invention aims to provide a bearing speed reducer retainer to solve the problem that the existing speed reducer is poor in bearing capacity.

In order to achieve the purpose, the basic technical scheme of the invention is as follows: the bearing speed reducer retainer comprises an input ring, a mounting ring and an output ring which are sequentially distributed from top to bottom; the outer side wall of the input ring is provided with a plurality of circular and uniformly distributed holding plates, and the top ends of the holding plates are higher than the top end of the input ring; the bottom of the output ring is provided with a plurality of connecting holes.

In practical application, the input ring is used as the input end of the bearing speed reducer, so that an input shaft and an eccentric wheel for inputting power are conveniently arranged on the input ring, the mounting ring is used for positioning and mounting the retainer, and the output ring is used for outputting the power after speed change. The upper end of input ring is used for placing the race in the bearing speed reducer and is the interior row roller of circular distribution, and the inboard of input ring is used for installing the input shaft and the eccentric wheel of location bearing speed reducer, and the outside of input ring is used for installing the outer row roller of location bearing speed reducer. The retaining plate is used for limiting and protecting an outer row of rollers of the bearing speed reducer, and limiting the bearing ring and the inner row of rollers and reinforcing the transmission structure.

The input shaft transmits power to the inner row of rollers, the inner row of rollers transmits power to the bearing ring, the bearing ring transmits power to the outer row of rollers, the outer row of rollers is matched with the shell of the bearing speed reducer to push the retainer to rotate, and rotation speed conversion and power transmission of input power are achieved through transmission of the multistage rollers. The retainer plate is in close contact with the outer rollers arranged inside the bearing speed reducer, power transmission is convenient to transmit to the retainer, the retainer plate simultaneously limits the bearing ring in the bearing speed reducer, the axial and radial mechanical structure of the retainer is strengthened, the radial load born by the bearing speed reducer is equally distributed to all the outer rollers arranged outside through the retainer plate when in use, the outer rollers arranged outside through the retainer plate are limited when the bearing speed reducer bears the axial load, the axial load is uniformly distributed to the outer rollers arranged outside, the retainer, the bearing ring and the inner rollers arranged outside, the phenomenon that the inner wear of the bearing speed reducer is aggravated due to dislocation when the outer rollers bear the load is prevented, the stress of the retainer is uniform, the load is prevented from being concentrated, and the retainer can bear higher torsional force and shearing force. The retainer of this scheme can carry on spacingly to the outer row roller of bearing speed reducer, simultaneously with the load evenly distributed of bearing speed reducer on roller and retainer, makes the inside atress of bearing speed reducer more even, can bear bigger load.

Preferably, as an improvement of the basic solution, a middle part of the inner wall of the input ring protrudes outwards to form a limiting ring. The limiting ring is arranged, so that the input shaft positioning bearing in the input ring can be conveniently and quickly positioned, and the assembly is more convenient and accurate; the limiting ring and the input ring are integrally formed due to the arrangement, the shaping performance is better, the bearing capacity of the limiting ring is better, and the retainer is better in overall performance, more stable and more reliable.

In a second preferred embodiment, as an improvement of the first preferred embodiment, a locking groove is formed on an outer side wall of the input ring between adjacent retaining plates. Set up the draw-in groove and can provide spacing and protection for outer row of roller, outer row of roller intermittent type nature receives the extrusion of interior row of roller and centre wheel casing in the retainer use, can provide certain buffering clearance for outer row of roller through the draw-in groove, makes outer row of roller can carry out elastic motion between adjacent retainer plate, reduces outer row of roller and retainer plate, interior row of roller, centre wheel casing between the big sliding friction that rigid extrusion caused and bad influences such as wearing and tearing, noise etc..

Preferably, in a third aspect, as an improvement of the second aspect, the cross-sectional profile of the slot is arc-shaped. The ball is convenient for place in the draw-in groove like this to set up, makes for rolling contact between ball and the draw-in groove, and frictional force is littleer, and the wear is littleer, is difficult for themogenesis and production noise.

Preferably, in a third improvement of the first improvement, the retaining plate is integrally formed on the outer side wall of the input ring. The integrated forming enables the holding plate and the retainer to be more convenient to machine and form, the integrity is better, the mechanical property is better, and the bearing capacity of the bearing speed reducer is further enhanced.

Preferably, in a third improvement of the first improvement, the retaining plate is fixed to the outer side wall of the input ring by screws. The holding plate and the input ring can be assembled after being processed respectively by the arrangement, the structure of a single part is simpler, the processing and the manufacturing are more convenient, and the replacement and the maintenance are more convenient after the single holding plate is damaged.

Preferably, as an improvement of the fourth or fifth preferred embodiment, a positioning ring is disposed between the input ring and the mounting ring, the diameter of the input ring is smaller than that of the positioning ring, the diameter of the positioning ring is smaller than that of the mounting ring, the diameter of the output ring is smaller than that of the mounting ring, and the retaining plate is located above the positioning ring. The locating ring that sets up like this is convenient for fix a position the installation to the holder, also is convenient for set up the bearing in the outside of locating ring and turns into rolling friction with the sliding friction between holder and other parts for the inside friction of speed reducer reduces, further noise reduction, and reducing wear.

Drawings

FIG. 1 is a schematic structural diagram of a bearing reducer retainer according to an embodiment of the invention;

fig. 2 is a schematic structural diagram of a bearing speed reducer according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail below by way of specific embodiments:

reference numerals in the drawings of the specification include: the bearing device comprises a bearing pressing plate 1, a retainer 2, a retaining plate 21, an inner row of rollers 22, an outer row of rollers 23, an input ring 24, a mounting ring 25, a positioning ring 251, an output ring 26, a clamping groove 27, a limiting ring 28, a connecting hole 29, a center wheel shell 3, a cover plate 4, an eccentric wheel 5 and a bearing ring 6.

The embodiment is basically as shown in the attached figure 1: the bearing speed reducer retainer comprises a circular input ring 24, a mounting ring 25 and an output ring 26 which are integrally formed from top to bottom and are distributed in sequence, and the middle part of the inner wall of the input ring 24 protrudes outwards to form a limiting ring 28; a plurality of clamping grooves 27 uniformly distributed along the circumference are formed in the outer side wall of the input ring 24, the cross section profile of each clamping groove 27 is arc-shaped, and rectangular retaining plates 21 are integrally formed on the outer side wall of the input ring 24 between every two adjacent clamping grooves 27; the mounting ring 25 is positioned outside the input ring 24, and the upper end of the mounting ring 25 is in a step shape to form a positioning ring 251; the bottom of the output ring 26 is provided with a plurality of screw coupling holes 29 in the circumferential direction.

In this embodiment, in actual application, the bearing speed reducer includes, as shown in fig. 2, a cover plate 4, a center wheel housing 3, a holder 2, and a bearing pressing plate 1, where the cover plate 4 is located above the holder 2, the center wheel housing 3 is located outside the holder 2, the bearing pressing plate 1 is located below the holder 2, and the center wheel housing 3 and the bearing pressing plate 1 limit and fix the holder 2. The input ring 24 is used as the input end of the bearing speed reducer, the limit ring 28 is convenient for installing an input shaft and an eccentric wheel 5 for inputting power on the input ring 24, the inner row of rollers 22 which are distributed annularly are placed at the upper end of the input ring 24, the eccentric wheel 5 is positioned in the middle of the input ring 24, the eccentric wheel 5 is in close contact with the inner row of rollers 22, the outer side of the inner row of rollers 22 is provided with a bearing ring 6, the outer side of the bearing ring 6 is in close contact with the outer row of rollers 23, the outer row of rollers 23 is positioned between two adjacent retaining plates 21, the outer side of the retainer 2 is a center wheel shell 3 for limiting and guiding, the inner wall of the center wheel shell 3 is provided with a circular-like track formed by smooth transition of a plurality of slots with arc-shaped sections, and the outer row of rollers 23 are in close contact with the circular-like track. The input shaft transmits power to the inner row of rollers 22 through the eccentric wheel 5, the inner row of rollers 22 transmits power to the bearing ring 6, the bearing ring 6 transmits power to the outer row of rollers 23, the outer row of rollers 23 and the central wheel shell 3 are matched to push the retainer 2 to rotate, and the connecting hole 29 on the output ring 26 is connected with an output part, so that the rotation speed conversion and the power transmission of the input power are realized through the transmission of the multi-stage rollers. The retainer plate 21 is in close contact with the outer row of rollers 23, power transmission for the retainer 2 is facilitated, the retainer plate 21 simultaneously strengthens the axial and radial mechanical structure of the retainer 2, the load borne by the bearing speed reducer is equally distributed to all the outer row of rollers 23 through the retainer plate 21 during use, so that the stress of the retainer 2 is uniform, the load concentration is avoided, the radial torsion resistance and the axial bending resistance of the retainer 2 are better, larger external pressure can be borne, the bearing capacity of the bearing speed reducer is higher, and the service life is longer.

The foregoing is merely an example of the present invention and common general knowledge in the art of specific structures and/or features of the invention has not been set forth herein in any way. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, for example, the holding plate 21 can also be block-shaped, strip-shaped, trapezoid-shaped, taper-shaped, or special-shaped, and can also be fixed by bolting, welding, etc., which should also be considered as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. The bearing speed reducer retainer is characterized by comprising a circular input ring, a mounting ring and an output ring which are integrally formed from top to bottom and are distributed in sequence; the outer side wall of the input ring is provided with a plurality of retaining plates which are uniformly distributed in an annular shape, and the top ends of the retaining plates are higher than the top end of the input ring; the bottom of the output ring is provided with a plurality of connecting holes; the middle part of the inner wall of the input ring protrudes outwards to form a limiting ring; a clamping groove is arranged on the outer side wall of the input ring between the adjacent retaining plates; the input ring is arranged on the mounting ring, the output ring is arranged on the input ring, the positioning ring is arranged on the mounting ring, the input ring is arranged on the mounting ring, the output ring is arranged on the input ring, and the holding plate is arranged above the positioning ring.

2. The bearing reducer cage of claim 1, wherein: the cross section profile of the clamping groove is arc-shaped.

3. The bearing reducer cage of claim 2, wherein: the retaining plate is integrally formed on the outer side wall of the input ring.

4. The bearing reducer cage of claim 2, wherein: the holding plate is fixed on the outer side wall of the input ring through screws.