Gear transmission structure and anti-impact reducer with clearance elimination

Abstract

The application provides a gear transmission structure and an anti-impact gear reducer. The gear transmission structure comprises a driving assembly and a driven assembly. The driving assembly has at least two groups of driving teeth groups arranged at intervals in the axial direction, and there is a misalignment angle alpha between two opposite teeth of any two adjacent driving tooth groups. The driven assembly has a planetary gear, and the planetary gear has at least two groups of driven tooth groups meshing with the driving tooth groups. One of any two adjacent groups of driven tooth groups meshes with the left tooth surface of the teeth of the corresponding driving tooth group, and the other group meshes with the right tooth surface of the teeth of the corresponding driving tooth group. The application solves the problem that the meshing gap and transmission impact of the reducer in the prior art are difficult to eliminate.

Description

Technical Field

[0001] This invention relates to the field of speed reducer technology, and more specifically, to a gear transmission structure and a backlash-free, impact-resistant speed reducer. Background Technology

[0002] The RV reducer is a two-stage reducer consisting of a primary planetary gear drive and a secondary cycloidal pinwheel drive. It is commonly used in industrial robots, machine tool magazines, and other environments where high transmission accuracy and smoothness are required. The first stage of the RV reducer uses planetary gear meshing, and there is typically backlash between the input shaft (sun gear) and the planetary gears. This leads to large transmission errors, low transmission accuracy, and is accompanied by meshing impacts and a rapid decline in tooth surface precision, affecting the overall transmission accuracy and lifespan of the machine. Currently, the industry typically addresses these issues by reducing backlash and increasing tooth surface hardness, but these solutions are not only costly and ineffective, but also fail to completely resolve the problems.

[0003] Therefore, existing technologies suffer from the problem of difficult-to-eliminate gear meshing clearance and transmission shock. Summary of the Invention

[0004] The main objective of this invention is to provide a gear transmission structure and a backlash-free, impact-resistant reducer to solve the problem of difficult elimination of meshing backlash and transmission impact in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a gear transmission structure is provided, comprising: a drive assembly having at least two sets of spaced-apart drive gears along its axial direction, wherein there is a misalignment angle α between two opposing teeth of any two adjacent drive gear sets; and at least two driven assemblies having planetary gears having at least two sets of driven gears meshing with the drive gear sets, wherein one set of any two adjacent driven gear sets meshes with the left tooth surface of the corresponding drive gear set, and the other set meshes with the right tooth surface of the corresponding drive gear set.

[0006] Furthermore, there are two driven components, which are symmetrically arranged about the driving component.

[0007] Furthermore, the drive assembly includes a drive shaft, one end of which is provided with a set of drive teeth, and all the sets of drive teeth are spaced apart along the axial direction of the drive shaft.

[0008] Furthermore, the driven component includes a driven shaft, and a planetary gear is sleeved on the driven shaft and drives the driven shaft to rotate.

[0009] Furthermore, the axis of the drive shaft is parallel to the axis of the driven shaft.

[0010] Furthermore, the axis of the drive shaft coincides with the axis of the drive gear set; and / or the axis of the driven shaft coincides with the axis of the driven gear set.

[0011] Furthermore, the planetary gear also has internal transmission teeth, and the driven shaft has splines in the circumferential direction that mate with the internal transmission teeth.

[0012] Furthermore, the misalignment angle α between the two opposing teeth of any two adjacent drive gear sets is the same.

[0013] Furthermore, the misalignment angle α is greater than or equal to 2° and less than or equal to 5°.

[0014] According to another aspect of the present invention, a backlash-free, shock-resistant speed reducer is provided, comprising the gear transmission structure described above.

[0015] Applying the technical solution of this invention, the gear transmission structure in this application includes a drive assembly and at least two driven assemblies. The drive assembly has at least two sets of spaced-apart drive gears along its axial direction, and there is a misalignment angle α between the two opposing teeth of any two adjacent drive gear sets; the driven assembly has a planetary gear, and the planetary gear has at least two sets of driven gears that mesh with the drive gear sets, wherein one set of any two adjacent driven gear sets meshes with the left tooth surface of the corresponding drive gear set, and the other set meshes with the right tooth surface of the corresponding drive gear set.

[0016] When using the gear transmission structure of this application, since the drive component of the gear transmission structure has at least two sets of spaced-apart drive gears, and the planetary gear of the driven component has driven gears that mesh with the two sets of drive gears, and since one set of any two adjacent driven gears meshes with the left tooth surface of the corresponding drive gear, and the other set meshes with the right tooth surface of the corresponding drive gear, when the drive component rotates forward or reverse, it can ensure that there is no meshing backlash during forward or reverse driving, avoiding the impact of meshing impact on the tooth surface, thereby improving the service life of the gear transmission structure and the backlash-free and impact-resistant reducer. At the same time, when the drive component changes its driving direction, this arrangement also avoids the phenomenon of the drive component spinning freely, eliminating the impact of backlash on transmission error and improving transmission accuracy. Therefore, the gear transmission structure of this application effectively solves the problem of difficult elimination of meshing backlash and transmission impact in the prior art. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of a backlash-free, impact-resistant speed reducer according to a specific embodiment of the present invention is shown;

[0019] Figure 2 It shows Figure 1 A schematic diagram showing the positional relationship between the two planetary gears of the two driven components and the drive gear set in the gear transmission structure of the backlash-free and impact-resistant reducer.

[0020] Figure 3 It shows Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 It shows Figure 2 Enlarged view of point B in the middle.

[0022] The above figures include the following reference numerals:

[0023] 10. Drive assembly; 11. Drive gear set; 111. Left tooth surface; 112. Right tooth surface; 12. Drive shaft; 20. Driven assembly; 21. Planetary gear; 211. Driven gear set; 212. Internal transmission gear; 22. Driven shaft; 221. Spline. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0027] To address the problem of difficult elimination of meshing backlash and transmission impact in existing reducers, this application provides a gear transmission structure and a backlash-free, impact-resistant reducer.

[0028] And, as Figure 1 As shown, the backlash-free, impact-resistant reducer in this application has the following gear transmission structure.

[0029] like Figures 1 to 4As shown, the gear transmission structure in this application includes a drive assembly 10 and at least two driven assemblies 20. The drive assembly 10 has at least two sets of spaced-apart drive gear sets 11 in its axial direction, and there is a misalignment angle α between the two opposing teeth of any two adjacent drive gear sets 11. The driven assembly 20 has a planetary gear 21, which has at least two sets of driven gear sets 211 that mesh with the drive gear sets 11. One set of any two adjacent driven gear sets 211 meshes with the left tooth surface 111 of the corresponding drive gear set 11, and the other set meshes with the right tooth surface 112 of the corresponding drive gear set 11.

[0030] When using the gear transmission structure of this application, since the drive assembly 10 of the gear transmission structure has at least two sets of spaced-apart drive gear sets 11, and the planetary gear 21 of the driven assembly 20 has driven gear sets 211 that mesh with the two sets of drive gear sets 11, and since one set of any two adjacent sets of driven gear sets 211 meshes with the left tooth surface 111 of the corresponding drive gear set 11, and the other set meshes with the right tooth surface 112 of the corresponding drive gear set 11, when the drive assembly 10 rotates forward or reverse, it can ensure that there is no meshing backlash when the drive assembly 10 is driven in both directions, avoiding the influence of meshing impact on the tooth surface, thereby improving the service life of the gear transmission structure and the backlash-free and impact-resistant reducer. At the same time, when the drive assembly 10 changes the driving direction, this arrangement can also avoid the phenomenon of the drive assembly 10 spinning freely, eliminate the influence of backlash on transmission error, and improve transmission accuracy. Therefore, the gear transmission structure of this application effectively solves the problem of difficult elimination of meshing backlash and transmission impact in the prior art.

[0031] Furthermore, it should be noted that in a preferred embodiment of this application, the number of driven tooth sets 211 of the planetary gear 21 is the same as the number of driving tooth sets 11, and they correspond one-to-one. Simultaneously, the number of teeth in each driving tooth set 11 is the same, the teeth in adjacent driving tooth sets 11 are one-to-one, and there is a misalignment angle α between corresponding teeth. Moreover, there is no misalignment angle α between corresponding teeth of adjacent driven tooth sets 211 on the planetary gear 21, thereby ensuring that in any two adjacent driven tooth sets 211, one driving tooth set 11 meshes with the left tooth surface 111 of the corresponding driving tooth set 11, and the other driving tooth set 11 meshes with the right tooth surface 112 of the corresponding driving tooth set 11.

[0032] Optionally, the diameter of the drive gear set 11 is smaller than the diameter of the driven gear set 211. This arrangement effectively ensures the deceleration effect of the backlash-free, impact-resistant reducer. Of course, the specific dimensional relationship between the drive gear set 11 and the driven gear set 211 can be adjusted according to actual usage requirements.

[0033] In one specific embodiment of this application, such as Figure 1 As shown, there are two driven components 20, which are symmetrically arranged about the drive component 10. That is, in this embodiment, the drive component 10 drives both driven components 20 simultaneously. Furthermore, the same drive gear set 11 meshes with the driven gear sets 211 of two different planetary gears 21 of the two driven components 20 simultaneously.

[0034] Specifically, such as Figure 1 As shown, the drive assembly 10 includes a drive shaft 12, one end of which is provided with a drive gear set 11, and all drive gear sets 11 are spaced apart along the axial direction of the drive shaft 12. Furthermore, the driven assembly 20 includes a driven shaft 22, and a planetary gear 21 is sleeved on the driven shaft 22 and drives the driven shaft 22 to rotate.

[0035] Optionally, the axis of the drive shaft 12 coincides with the axis of the drive gear set 11; the axis of the driven shaft 22 coincides with the axis of the driven gear set 211. Preferably, the axis of the drive shaft 12 and the axis of the driven shaft 22 are parallel.

[0036] This configuration not only ensures the meshing effect between the drive gear set 11 and the driven gear set 211, but also effectively guarantees the transmission effect between the drive assembly 10 and the driven assembly 20. Furthermore, this configuration also ensures better force distribution between the drive shaft 12 and the driven shaft 22, thereby improving the service life of the gear transmission structure and the backlash-free, impact-resistant reducer.

[0037] Optionally, the planetary gear 21 also has internal transmission teeth 212, and the driven shaft 22 has splines 221 in the circumferential direction that mate with the internal transmission teeth 212. When the drive assembly 10 drives the planetary gear 21 to rotate through the drive gear set 11, this arrangement can effectively ensure that the planetary gear 21 can drive the driven shaft 22 to rotate.

[0038] Specifically, the misalignment angle α between the two opposing teeth of any two adjacent drive tooth sets 11 is the same. This arrangement effectively ensures the meshing effect between the drive tooth set 11 and the driven tooth set 211, thereby reducing the generation of meshing backlash.

[0039] Optionally, the offset angle α is greater than or equal to 2° and less than or equal to 5°. Of course, the actual size of the offset angle α in this application can be adaptively adjusted according to the specific application.

[0040] In this application, the backlash-free, impact-resistant reducer can be an RV reducer.

[0041] In one specific embodiment of this application, the two planetary gears of the two driven components are a first planetary gear and a second planetary gear, respectively, and the two driven shafts are a first driven shaft and a second driven shaft, respectively. The drive shaft is axially provided with two sets of drive gears, namely a first drive gear set and a second drive gear set, respectively. The axes of the first drive gear set and the second drive gear set coincide, and the first drive gear set and the second drive gear set are arranged in series along the axial direction. The first drive gear set and the second drive gear set are offset along the axial direction with an offset angle α. The first planetary gear includes a first planetary internal tooth (i.e., transmission internal tooth) and a first planetary external tooth. The axis of the drive shaft is located at the center of symmetry between the axis of the first planetary gear and the axis of the second planetary gear. The external teeth of the first planetary gear are provided with a first driven gear set and a second driven gear set (i.e., two sets of driven gear sets) along the tooth direction. The first driven gear set and the second driven gear set are arranged in series along the tooth direction. The left tooth surface of the first driven gear set is coplanar with the left tooth surface of the second driven gear set, and the right tooth surface of the first driven gear set is coplanar with the left tooth surface of the second driven gear set. The right tooth surfaces of the moving gear set are coplanar. The second planetary gear includes the second planetary internal teeth (i.e., transmission internal teeth) and the second planetary external teeth. The second planetary external teeth are provided with a third driven gear set and a fourth driven gear set (i.e., two driven gear sets) along the tooth direction. The third and fourth driven gear sets are arranged in series along the tooth direction. The left tooth surface of the third driven gear set is coplanar with the left tooth surface of the fourth driven gear set, and the right tooth surface of the third driven gear set is coplanar with the right tooth surface of the fourth driven gear set. The left tooth surface of the first driving gear set meshes with the left tooth surface of the first driven gear set. The first driving gear group meshes with the left tooth surface of the third driven gear group, the second driving gear group meshes with the right tooth surface of the second driven gear group, and the second driving gear group meshes with the right tooth surface of the fourth driven gear group. The first driven shaft is provided with a first transmission spline, the first planetary internal gear meshes with the first transmission spline, and the first driven shaft coincides with the axis of the first planetary gear. The second driven shaft is provided with a second transmission spline, the second planetary internal gear meshes with the second transmission spline, and the second driven shaft coincides with the axis of the second planetary gear.

[0042] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0043] 1. Effectively solves the problem of difficult elimination of meshing clearance and transmission shock in existing technologies;

[0044] 2. Simple structure and stable performance.

[0045] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gear transmission structure, characterized in that, include: The drive assembly (10) has at least two sets of spaced drive tooth groups (11) in its axial direction, and there is a misalignment angle α between two opposing teeth of any two adjacent drive tooth groups (11). At least two driven components (20), each driven component (20) having a planetary gear (21), each planetary gear (21) having at least two sets of driven gears (211) meshing with the drive gear set (11), wherein one set of any two adjacent sets of driven gears (211) meshes with the left tooth surface (111) of the corresponding drive gear set (11), and the other set meshes with the right tooth surface (112) of the corresponding drive gear set (11); The drive assembly (10) includes a drive shaft (12), one end of which is provided with the drive gear set (11), and all the drive gear sets (11) are spaced apart along the axial direction of the drive shaft (12). The driven component (20) includes a driven shaft (22), and the planetary gear (21) is sleeved on the driven shaft (22) and drives the driven shaft (22) to rotate.

2. The gear transmission structure according to claim 1, characterized in that, There are two driven components (20), and the two driven components (20) are symmetrically arranged about the driving component (10).

3. The gear transmission structure according to claim 1, characterized in that, The axis of the drive shaft (12) is parallel to the axis of the driven shaft (22).

4. The gear transmission structure according to claim 3, characterized in that, The axis of the drive shaft (12) coincides with the axis of the drive gear set (11); and / or The axis of the driven shaft (22) coincides with the axis of the driven gear set (211).

5. The gear transmission structure according to claim 1, characterized in that, The planetary gear (21) also has internal transmission teeth (212), and the driven shaft (22) has a spline (221) in the circumferential direction that engages with the internal transmission teeth (212).

6. The gear transmission structure according to any one of claims 1 to 5, characterized in that, The misalignment angle α between the two opposing teeth of any two adjacent drive gear sets (11) is the same.

7. The gear transmission structure according to any one of claims 1 to 5, characterized in that, The misalignment angle α is greater than or equal to 2° and less than or equal to 5°.

8. A backlash-free, impact-resistant speed reducer, characterized in that, The gear transmission structure includes any one of claims 1 to 7.

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