Speed reducer structure

Abstract

The utility model provides a speed reducer structure which defines an axis, an input shaft extending along the axis, a first external gear which is eccentric relative to the axis and is rotatably connected to the input shaft, when the input shaft rotates, the first external gear is driven to rotate around the axis, a first internal gear is arranged outside the first external gear, and a second internal gear is arranged outside the first external gear. The first inner gear and the second inner gear are sequentially arranged along the axis, the number of teeth of the first inner gear is different from that of teeth of the second inner gear, the first outer gear is meshed with the first inner gear and the second inner gear at the same time, an output shaft is connected with the second inner gear and wraps and supports related groups, the first inner gear is fixed in the shell, and therefore the speed reducer is small in size and easy to manufacture.

Description

Technical Field

[0001] The utility model relates to a reducer. Background Art

[0002] A reducer is a device used in machinery to reduce speed and increase torque. Depending on the principle, it can be classified into planetary reducers, cycloid reducers, worm gear reducers, harmonic reducers, etc.

[0003] However, most of the aforementioned reducers are relatively bulky and cannot be used under conditions requiring lightweight machinery. Alternatively, they require the manufacture of special components such as flexible splines or eccentric gears, which are costly and difficult to manufacture. In addition, the elastic gear structure has low strength and cannot withstand large loads.

[0004] Therefore, how to reduce the overall size of the reducer and reduce its cost while also taking into account its service life has become an urgent issue that needs to be addressed in the industry. Utility Model Content

[0005] The purpose of the present invention is to provide a reducer with a small size, a high reduction ratio and easy processing and manufacturing. Another purpose is to improve the structural strength of the reducer components to increase their service life.

[0006] In order to achieve the above-mentioned object, the present invention provides a reducer structure, characterized in that it comprises:

[0007] an input shaft extending along the axis and having a large end supporting a single external gear and a balance weight retainer;

[0008] a first external gear, the shaft of which extends parallel to the axis of the input shaft and is eccentric relative to the input shaft, such that when the input shaft rotates, the first external gear is driven to rotate about the axis of the input shaft;

[0009] a first internal gear;

[0010] a second internal gear, wherein the number of teeth of the first internal gear is different from the number of teeth of the second internal gear, and the first external gear is meshed with both the first internal gear and the second internal gear;

[0011] an output shaft connected to the second internal gear and extending parallel to the axis;

[0012] A housing is provided outside the first external gear, the first internal gear and the second internal gear. The first internal gear is fixed in the housing.

[0013] The reducer structure, wherein: when a single external gear is used, it will include a counterweight block, which is arranged on the opposite side of the first external gear and is also eccentrically arranged relative to the axis of the input shaft. One end of the counterweight block is connected to the retainer. When the input shaft rotates, the counterweight block is driven to rotate around the axis through the retainer.

[0014] The reducer structure, wherein: the distance from an axis of the first external gear to the axis of the reducer structure is equal to the distance from an axis of the counterweight block to the axis of the reducer structure, and the line connecting the axis of the first external gear and the axis of the counterweight block passes through the axis of the reducer structure.

[0015] The reducer structure is described, wherein: the counterweight block is replaced with a second external gear, the second external gear has the same number of teeth as the first external gear and is also engaged with the first internal gear and the second internal gear at the same time, the second external gear is arranged on the opposite side of the first external gear, and when the input shaft rotates, the second external gear is driven to rotate around the axis through the retainer.

[0016] In the reducer structure, when the difference in tooth thickness between the two internal gears is N teeth, the number of external gears provided on the input shaft retainer is N or 2N.

[0017] The reducer structure provided by this utility model utilizes all internal and external gears using conventional gear production equipment, eliminating the need for special curves or flexible splines. The overall volume is significantly smaller than conventional reducers while maintaining high reduction ratios. More importantly, the reducer is easy to manufacture and assemble, boasts a symmetrical and stable overall structure, and offers stable, vibration-free rotation and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the present utility model.

[0019] Figure 2 It is a side view of the present utility model.

[0020] Figure 3 for Figure 2 AA cross-section diagram.

[0021] Figure 4 This is a three-dimensional exploded view of the present invention.

[0022] Figure 5 It is a partial three-dimensional diagram of the utility model.

[0023] Figures 6a to 6u It is a schematic diagram of the continuous action of the utility model.

[0024] Figure 7 This is a cross-sectional view of the second embodiment of the present invention.

[0025] Explanation of reference numerals: input shaft 10 ; first external gear 20 ; first through-portion 21 ; first internal gear 30 ; second internal gear 40 ; output shaft 50 ; housing 60 ; retainer 70 ; first through-hole 71 ; counterweight 80 ; second through-portion 81 ; second external gear 90 ; third through-portion 91 . DETAILED DESCRIPTION

[0026] In order to enable a further understanding of the present invention, a preferred embodiment is now listed and described in detail with reference to the accompanying drawings:

[0027] The utility model provides a reducer structure. Please refer to the exploded diagram. Figure 4 The reducer structure includes an input shaft 10 , a first external gear 20 , a first internal gear 30 , a second internal gear 40 , an output shaft 50 and a housing 60 .

[0028] The input shaft 10 extends along the axis; the external gear 20 is parallel to the axis of the first external gear 20 and is supported in the hole of the large end retainer 71 of the input shaft 10 when assembled. When the input shaft 10 rotates, it drives the first external gear 20 to rotate around the axis of the input shaft 10; the axis of the first internal gear 30 is parallel to the axis of the second internal gear 40, and the two internal gears 30 and 40 are concentric. The number of teeth of the first internal gear 30 is different from the number of teeth of the second internal gear 40, and the difference in teeth number can be 1, 2 or 3. When in operation, the first external gear 20 is engaged with the first internal gear 30 and the second internal gear 40 at the same time; the output shaft 50 and the second internal gear 40 are an integral structure; the housing 60 supports the output shaft 50 through bearings, and the first internal gear 30 is fixed in the housing 60. Please refer to the combined structure Figure 5 .

[0029] In order to avoid the center of gravity shifting and vibrating when the reducer input shaft rotates at high speed, the design of the counterweight block 80 is set on the symmetrical side of the first external gear 20 and is connected to the opposite side hole 71 at the large end of the input shaft 10.

[0030] Specifically, in the main embodiment of the present invention, the first internal gear 30 is fixed to the housing 60 and cannot rotate. When the input shaft 10 rotates, it drives the first external gear 20 to rotate about the axis of the input shaft 10. The first external gear 20 revolves around the first internal gear 30 like a planet and simultaneously rotates due to meshing with the first internal gear 30. The first external gear 20 also meshes with the second internal gear. Because the first and second internal gears have different numbers of teeth, there is a tooth misalignment between them. As the first external gear revolves and rotates, the reaction force of the first internal gear shifts the second internal gear, thereby driving the second internal gear to rotate and achieve force output. Specifically, the first external gear has 17 teeth, the first internal gear has 40 teeth, and the second internal gear has 41 teeth. The tooth number difference between the first and second internal gears is 1. When the first external gear revolves once, it drives the second internal gear to rotate by 1 tooth, that is, 1 / 40 of a turn. Therefore, a reduction ratio of 1:40 is achieved. Please refer to the operation process. Figures 6a to 6uIt can be seen that the first internal gear and the second internal gear are engaged at the same time, and the first external gear moves with the revolution of the first external gear, moving counterclockwise from the 12 o'clock position for one circle, thereby causing the second internal gear to rotate relative to the first internal gear, resulting in a deceleration effect due to the tooth difference.

[0031] Please also refer to Figure 7 , which is the second embodiment of the present invention. This embodiment further includes a second external gear 90 having the same number of teeth as the first external gear 20 and meshing with the first internal gear 30 and the second internal gear 40, respectively. In other words, the counterweight is replaced with a pair of identical left and right external gears.

[0032] In this embodiment, the first external gear 20 and the second external gear 90 have the same number of teeth, 17. In order to allow the first external gear 20 and the second external gear 90 to mesh with the first internal gear 30 and the second internal gear 40 at the same time, the difference in the number of teeth between the first internal gear 30 and the second internal gear 40 is an integer multiple of 2. For example, the first internal gear 30 has 40 teeth, and the second internal gear 40 has 42 teeth. When the first external gear 20 and the second external gear 90 orbit one circle, the second internal gear rotates 2 teeth, that is, 2 / 40 of a circle, thereby achieving a reduction ratio of 1:20. This lower reduction ratio design, due to the use of identical first external gear 20 and second external gear 90, not only achieves the best effect in balancing the weight, but also has two teeth that bear the load simultaneously, which multiplies the load on the overall structure and makes the force transmission more uniform. In practice, it is also a good embodiment.

[0033] In addition, conventional components such as bearings are provided at the front and rear of each rotating element of the present invention to ensure smooth operation, which will not be described in detail here.

[0034] In summary, the reducer structure provided by the present invention can have a relatively smaller volume when achieving a high reduction ratio compared to various conventional reducers, and does not require the manufacture of special curved parts, eccentric parts, or flexible wheels with special shapes. In principle, only circular gears of general shape need to be used. It is easy to manufacture, process, assemble, and maintain, which is superior to conventional technology. It can provide a stable reduction effect and avoid vibration and wear, which is indeed what the industry expects.

[0035] The utility model has been actually tried and manufactured, and has been applied to the precise indexing positioning of the vertical lathe workbench and similar indexing mechanisms, and has achieved good results.

Claims

1. A reducer structure, characterized in that: Include: an input shaft extending along the axis and having a large end supporting a single external gear and a balance weight retainer; a first external gear, the shaft of which extends parallel to the axis of the input shaft and is eccentric relative to the input shaft, such that when the input shaft rotates, the first external gear is driven to rotate about the axis of the input shaft; a first internal gear; a second internal gear, wherein the number of teeth of the first internal gear is different from the number of teeth of the second internal gear, and the first external gear is meshed with both the first internal gear and the second internal gear; an output shaft connected to the second internal gear and extending parallel to the axis; A housing is provided outside the first external gear, the first internal gear and the second internal gear. The first internal gear is fixed in the housing.

2. The reducer structure according to claim 1, characterized in that: When a single external gear is used, a counterweight block will be included. The counterweight block is located on the opposite side of the first external gear and is also eccentrically arranged relative to the axis of the input shaft. One end of the counterweight block is connected to the retainer. When the input shaft rotates, the counterweight block is driven to rotate around the axis through the retainer.

3. The reducer structure according to claim 2, wherein: The distance from an axis of the first external gear to the axis of the reducer structure is equal to the distance from an axis of the counterweight block to the axis of the reducer structure, and the line connecting the axis of the first external gear and the axis of the counterweight block passes through the axis of the reducer structure.

4. The reducer structure according to claim 1, wherein: The counterweight is replaced with a second external gear. The second external gear has the same number of teeth as the first external gear and is also meshed with the first internal gear and the second internal gear. The second external gear is located on the opposite side of the first external gear. When the input shaft rotates, the second external gear is driven to rotate around the axis via the retainer.

5. The reducer structure according to claim 1, wherein: When the difference in tooth thickness between the two internal gears is N teeth, the number of external gears provided on the input shaft retainer is N or 2N.

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