CN111043252A

CN111043252A - Interdental transmission structure of speed reducer

Info

Publication number: CN111043252A
Application number: CN201911201927.0A
Authority: CN
Inventors: 胡松林; 黄亮
Original assignee: Guangdong Dashi Intelligent Equipment Co ltd
Current assignee: Guangdong Dashi Intelligent Equipment Co ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-04-21

Abstract

The invention provides an inter-tooth transmission structure of a speed reducer, which comprises an outer wheel, an inner wheel and a rolling piece arranged between the outer wheel and the inner wheel, wherein when the inner wheel eccentrically swings relative to the outer wheel, the rolling piece revolves around the central axis of the outer wheel while rotating. The inter-tooth transmission structure can reduce the transmission friction between the outer wheel and the inner wheel to a greater extent, thereby having the advantages of high transmission efficiency, lower requirement on materials, longer service life and the like.

Description

Interdental transmission structure of speed reducer

Technical Field

The invention relates to the technical field of speed reducer transmission, in particular to an inter-tooth transmission structure of a speed reducer.

Background

The transmission device applied to the precise servo mechanisms of robots, precise machine tools, aerospace and the like is required to have the characteristics of high transmission precision, high transmission rigidity, large transmission ratio, high transmission efficiency, small volume, light weight, small transmission return difference, small rotational inertia of a rotating part and the like. In the prior art, a description of a harmonic transmission device (publication number: CN207261609U, publication number 2018-04-20) with a cycloid pin gear discloses a related art, in which a rigid gear and a flexible gear are connected through a needle roller, and a rib structure is designed in the rigid gear so that the needle roller is restrained in the semicircular groove. In planetary reducers, needle bearings are usually fixed between the cycloid gears and the needle housing, and the needle bearings are connected to each other, as disclosed in the specification entitled pure cycloid reducer (publication No. CN101749376A, published 2010-06-23). Although these two transmission structures have many advantages, the simultaneous revolution of the self-transmission of the rolling elements (such as needles or needle bearings) cannot be realized in the transmission, and the transmission friction is still large, which results in the defects of low transmission efficiency, high requirement on materials, short service life and the like. Thus, there is a need for further improvements.

Disclosure of Invention

The invention provides a tooth space transmission structure of a speed reducer, which solves the technical problem of large tooth space transmission friction of the speed reducer in the prior art.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the inter-tooth transmission structure of the speed reducer comprises an outer wheel, an inner wheel and a rolling piece arranged between the outer wheel and the inner wheel, wherein when the inner wheel eccentrically swings relative to the outer wheel, the rolling piece revolves around the central axis of the outer wheel while rotating.

Furthermore, the outer wheel is provided with an inner gear ring, the inner wheel is provided with an outer gear ring, the rolling pieces are uniformly distributed in a gap between the outer wheel and the inner wheel along the inner circumference of the outer wheel, and when the inner wheel eccentrically swings relative to the outer wheel, the rolling pieces are circularly engaged, meshed and meshed with the inner teeth of the inner gear ring and the outer teeth of the outer gear ring respectively.

Furthermore, an inner tooth groove is formed between two adjacent inner teeth of the inner gear ring, an outer tooth groove is formed between two adjacent outer teeth of the outer gear ring, the depth of the inner tooth groove is h1, the depth of the outer tooth groove is h2, and the outer diameter of the rolling piece is d, wherein h1 is less than d/2, and h2 is less than d/2.

Preferably, d/4< h1< d/2, d/4< h2< d/2.

Further, the inner wheel is a cycloid wheel, and the outer wheel is a pin gear shell.

Preferably, the inner wheel is provided with at least three support holes, and the support holes are supported by ball bearings.

Preferably, the number of the inner wheels is 4.

Further, the inner wheel is a flexible gear, and the outer wheel is a rigid gear.

Preferably, the rolling member is a cylindrical rolling member.

Preferably, the inner teeth and the outer teeth are both provided in a cycloid tooth form, and the outer teeth have two more teeth than the inner teeth.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of an interdental transmission structure of a reducer according to the present invention;

FIG. 2 is a schematic view of the partially exploded structure of FIG. 1;

FIG. 3 is a schematic structural diagram of a second embodiment of the interdental transmission structure of the reducer according to the present invention;

fig. 4 is an exploded view of fig. 3.

Detailed Description

The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are for reference and illustration only and are not to be construed as limiting the scope of the invention.

As shown in fig. 1 to 4, an inter-tooth transmission structure of a reduction gear comprises an outer wheel 1, an inner wheel 2, and a rolling element 3 disposed between the outer wheel 1 and the inner wheel 2, wherein when the inner wheel 2 eccentrically swings with respect to the outer wheel, the rolling element 3 revolves around a central axis of the outer wheel while rotating on its axis.

As a further improvement, the outer wheel 1 is provided with an inner gear ring 11, the inner wheel 2 is provided with an outer gear ring 21, the rolling members 3 are uniformly arranged in a gap between the outer wheel and the inner wheel along the inner circumference of the outer wheel 1, and when the inner wheel 2 eccentrically swings relative to the outer wheel 1, the rolling members 3 are circularly engaged, meshed and disengaged with the inner teeth of the inner gear ring and the outer teeth of the outer gear ring respectively.

Specifically, an inner tooth groove is formed between two adjacent inner teeth of the inner gear ring 11, an outer tooth groove is formed between two adjacent outer teeth of the outer gear ring 21, the depth of the inner tooth groove is h1, the depth of the outer tooth groove is h2, and the outer diameter of the rolling member is d, wherein h1 is less than d/2, and h2 is less than d/2. More preferably, d/4< h1< d/2, d/4< h2< d/2. Preferably, the inner teeth and the outer teeth are both provided with cycloid teeth, and the number of the outer teeth is two more than that of the inner teeth.

The first embodiment is as follows: as shown in fig. 1 and 2, on the basis of the above-mentioned technology, the inter-tooth transmission structure also has a transmission structure similar to a cycloidal pin gear reducer, which is specifically as follows:

the inner wheel 2 is selected as a cycloid wheel, and the outer wheel 1 is selected as a needle gear shell.

In this embodiment, at least three support holes 22 are formed in the inner wheel 2, and the support holes 22 are supported by ball bearings 4.

In the present embodiment, the number of the inner wheels 2 is 4.

Example two: as shown in fig. 3 and 4, on the basis of the above-mentioned technology, the inter-tooth transmission structure also has a transmission structure similar to a harmonic reducer, specifically as follows: the inner wheel 2 is a flexible gear, and the outer wheel 1 is a rigid gear.

The rolling elements 3 are cylindrical rolling elements. In particular, the cylindrical rolling elements are rigid cylindrical rolling beads, and the type of the cylindrical rolling elements can be rolling needles, rolling beads or miniature rolling bearings.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention.

Claims

1. The interdental drive structure of the speed reducer is characterized in that: the eccentric swinging device comprises an outer wheel, an inner wheel and a rolling piece arranged between the outer wheel and the inner wheel, wherein when the inner wheel eccentrically swings relative to the outer wheel, the rolling piece revolves around the central axis of the outer wheel while rotating.

2. The interdental transmission structure of a speed reducer according to claim 1, wherein: the outer wheel is provided with an inner gear ring, the inner wheel is provided with an outer gear ring, the rolling pieces are uniformly distributed in a gap between the outer wheel and the inner wheel along the inner circumference of the outer wheel, and when the inner wheel eccentrically swings relative to the outer wheel, the rolling pieces are circularly engaged, meshed and nibbled with the inner teeth of the inner gear ring and the outer teeth of the outer gear ring respectively.

3. The interdental transmission structure of a speed reducer according to claim 2, wherein: an inner tooth groove is formed between two adjacent inner teeth of the inner gear ring, an outer tooth groove is formed between two adjacent outer teeth of the outer gear ring, the depth of the inner tooth groove is h1, the depth of the outer tooth groove is h2, the outer diameter of the rolling piece is d, wherein h1 is less than d/2, and h2 is less than d/2.

4. The interdental transmission structure of a speed reducer according to claim 3, wherein: d/4< h1< d/2, d/4< h2< d/2.

5. The interdental transmission structure of a speed reducer according to any one of claims 1 to 4, wherein: the inner wheel is a cycloid wheel, and the outer wheel is a pin gear shell.

6. The interdental transmission structure of a speed reducer according to claim 5, wherein: at least three supporting holes are formed in the inner wheel, and the supporting holes are supported through ball bearings.

7. The interdental transmission structure of a speed reducer according to claim 6, wherein: the number of the inner wheels is 4.

8. The interdental transmission structure of a speed reducer according to any one of claims 1 to 4, wherein: the inner wheel is a flexible gear, and the outer wheel is a rigid gear.

9. The interdental transmission structure of a speed reducer according to claim 1, wherein: the rolling member is a cylindrical rolling member.

10. The interdental transmission structure of a speed reducer according to claim 3, wherein: the internal teeth and the external teeth are both set to be cycloid tooth shapes, and the number of the external teeth is two more than that of the internal teeth.