External meshing transmission structure of cam and vector gear

Abstract

The invention relates to an external meshing transmission structure of cams and vector gears, and relates to the technical field of gear transmission, the transmission structure comprises a main shaft I, a main shaft II, a plurality of cams and a plurality of vector gears, the plurality of cams and the plurality of vector gears are arranged on the main shaft I and the main shaft II, and a plurality of vector grooves are formed in the vector gears; the multiple elastic pieces are detachably arranged on the vector gear through connecting assemblies and have elasticity, clamping grooves are formed in the multiple vector grooves, the multiple elastic pieces and the multiple clamping grooves are arranged in a one-to-one correspondence mode, and the two ends of each elastic piece are located in the corresponding clamping groove and extend out of the corresponding clamping groove under the action of elastic force to form an abutting part. In the meshing process of the cam and the vector groove, the elastic piece abuts against the cam under the action of elastic force, the cam extrudes the elastic piece after rotating and enables the elastic piece to enter the clamping groove, and the stability and transmission efficiency in the transmission process are improved.

Description

Technical Field

[0001] This application relates to the technical field of gear transmission, and in particular, to an external meshing transmission structure between a cam and a vector gear. Background Art

[0002] Robots need reducers as joints to complete various actions. Reducers used as robot joints need to have the properties of large reduction ratio, large load, high transmission accuracy, good accuracy retention, high transmission efficiency, small backlash, long service life, small volume, and light weight.

[0003] To better meet the above requirements, in the prior art, referring to the invention patent with the publication number of CN117052856A, this invention provides a transmission mechanism with external meshing between a cam and a vector gear. The contour curves of both the cam and the vector gear are vector curves, which improve the disadvantages of small transmission ratio, large occupied space, and backlash in the traditional external gear meshing transmission. The reduction ratio is equal to the number of teeth of the vector gear, with a large reduction ratio, small occupied space, zero backlash, rolling friction, small volume, high transmission accuracy, high transmission efficiency, good accuracy retention, high return accuracy, and smooth transmission, which can well meet the functional requirements of robot reducers.

[0004] A plurality of vector grooves meshing with the cam are formed on the circumference of the vector gear, and the vector grooves on the plurality of vector gears are spaced apart and mesh with the plurality of cams to achieve the driving effect. However, due to the particularity of the cam, the cam can only mesh with the vector groove once after one rotation. Even if there are multiple cams cooperating with the vector groove, the contact area between the vector gear and the vector groove is small when they mesh, resulting in poor stability during the transmission process. Especially when there is a gap between the cam and the vector groove, the stability during the transmission process is even worse, leading to poor stability and transmission efficiency of the gear transmission. Summary of the Invention

[0005] In order to improve the stability and transmission efficiency during the transmission process, this application provides an external meshing transmission structure between a cam and a vector gear.

[0006] An external meshing transmission structure between a cam and a vector gear provided by this application adopts the following technical solutions: An external meshing transmission structure between a cam and a vector gear includes a first main shaft, a second main shaft, a plurality of cams and a plurality of vector gears arranged on the first main shaft and the second main shaft. A plurality of vector grooves meshing with the cams are arranged on the vector gear. It is characterized in that: it further includes a plurality of elastic members which are detachably arranged on the vector gear through a connecting component and have elasticity. A plurality of clamping grooves are formed on the plurality of vector grooves. The plurality of elastic members are arranged in one-to-one correspondence with the plurality of clamping grooves. Both ends of the elastic member are located in the clamping groove and extend out of the clamping groove under the action of elastic force to form a pressing portion. When the cam meshes with the vector groove, the pressing portion is extruded and moves into the clamping groove.

[0007] By adopting the above technical solution, during the meshing process of the cam and the vector groove, the elastic member is pressed against the cam under the action of elastic force. After the cam rotates and squeezes the elastic member and enters the clamping groove, the cam and the vector groove are meshed, thus greatly increasing the contact area when the cam and the vector groove are meshed. The increased area can make the force more balanced during the transmission process, and the setting of the elastic member will not affect the original meshing process of the cam and the vector groove, making the transmission process more stable, thereby improving the stability and transmission efficiency during the transmission process; at the same time, the elastic member is a vulnerable part, so the elastic member can be replaced during the maintenance of the transmission structure, thereby further improving the stability and transmission efficiency during the transmission process.

[0008] Optionally, the plurality of clamping grooves communicate with each other and the plurality of elastic members are connected to each other.

[0009] By adopting the above technical solution, after connecting the plurality of elastic members as a whole and then installing them, the convenience of replacing and installing the elastic members is improved, and when one of the elastic members is stressed, the stress can be dispersed to the elastic members that are not squeezed, thereby greatly improving the elastic force effect of the elastic members and improving the stability and transmission efficiency during the transmission process.

[0010] Optionally, after the plurality of elastic members are connected to form an elastic body, the connecting assembly includes: Two plugging posts are arranged at both ends of the elastic body and are plugged and installed on the clamping groove for positioning; A connecting screw passes through one of the plugging posts and is threadedly connected to the other plugging post and is located in the clamping groove.

[0011] By adopting the above technical solution, a through hole is opened in the clamping groove. By screwing the connecting screw, the elastic body can be removed from the clamping groove. Place the elastic body to be replaced into the plurality of mutually connected clamping grooves. Plug and install the two plugging posts located at both ends of the elastic body on the through hole. Pass the connecting screw through one of the plugging posts and threadedly connect it to the other plugging post. At the same time, the head of the connecting screw is located in the clamping groove. The elastic body is clamped and installed on the clamping groove for positioning. The plurality of clamping grooves limit the movement of the elastic body and make the pressing parts located in the plurality of clamping grooves extend outside the clamping groove, thereby improving the convenience during installation. And when the vector gear is produced, only one more clamping groove and through hole need to be processed on the original processing basis, and the processing accuracy requirements for the clamping groove and the through hole are not high, so while meeting the installation of the elastic member, the production cost during processing is also reduced.

[0012] Optionally, a bent connecting portion is formed at the connection of two adjacent elastic members and is engaged with the connection of two adjacent clamping grooves. Before being squeezed, the elastic member maintains a certain distance from the connection of the two clamping grooves and drives the connecting portion to abut against the connection of the two clamping grooves for positioning after being squeezed. A limiting component is arranged on the two clamping grooves on both sides of the connecting portion. The limiting component enables one end of the elastic member close to the connecting portion to be located in the clamping groove and allows the elastic member to move within a certain range when being squeezed.

[0013] By adopting the above technical solution, when the elastic member is not squeezed, there is a certain gap buffer between the connecting portion and the connection of the two clamping grooves. The limiting component restricts the elastic member at the connecting portion in the clamping groove, so that both ends of multiple elastic members are located in the clamping groove, and the pressing portion is located outside the clamping groove, improving the stability during the extrusion of the elastic member against the cam; After the elastic member is squeezed, the connecting portion can approach and abut against the connection of the two clamping grooves for positioning, so as to achieve buffering, reduce the risk of damage to the elastic member after being squeezed, and improve the stability and transmission efficiency during the transmission process.

[0014] Optionally, the cross section of the clamping groove is trapezoidal and is convenient for the elastic member to be placed. A moving hole is opened on the elastic member. The limiting component includes: Two limiting plates, which are clamped and installed on the clamping grooves on both sides of the connecting portion. A moving space for the movement of the elastic member is formed by the cooperation between the limiting plate and the clamping groove. A moving column that passes through the moving hole, is slidably connected with the moving hole, and is clamped and matched with the clamping groove is arranged on each of the two limiting plates; A limiting screw, which passes through one of the limiting plates and the moving column and is threadedly connected with the other moving column.

[0015] By adopting the above technical solution, the trapezoidal clamping groove is convenient for the elastic member to be placed and is convenient for the limiting plate to press against the notch of the clamping groove to form a moving space with the clamping groove. The moving space is for the movement of the elastic member. The two limiting plates are respectively pressed against the notches of two adjacent clamping grooves. At the same time, the moving column passes through the moving hole and is clamped and matched with the clamping groove. The setting of the moving column can position and guide the positions of the two limiting plates and the movement of the elastic member. The limiting screw passes through one of the limiting plates, the moving column and is threadedly connected with the other moving column, so that two moving spaces can be formed for the movement of two adjacent elastic members, and only a hole structure for the clamping of the moving column for limiting needs to be opened on the clamping groove, improving the convenience during processing and reducing the production cost of the transmission structure.

[0016] Optionally, a corrugated portion in a corrugated shape is arranged on the elastic member By adopting the above technical solution, after the corrugated part is extruded and extended, when the cam moves away from the corrugated part, the corrugated part rebounds under the action of elastic force and presses against the cam, thereby increasing the contact area when the cam meshes with the vector gear and improving the stability and transmission efficiency during the transmission process.

[0017] Optionally, it further includes a linkage mechanism that connects the first main shaft and the second main shaft and enables the first main shaft and the second main shaft to rotate synchronously.

[0018] By adopting the above technical solution, the linkage mechanism enables the first main shaft and the second main shaft to rotate synchronously, that is, enables multiple cams and multiple vector gears to rotate synchronously, thereby further improving the stability and transmission efficiency during the transmission process.

[0019] Optionally, the linkage mechanism includes: A first gear and a second gear, which are respectively arranged on the first main shaft and the second main shaft; A linkage component, which is located between the first main shaft and the second main shaft and is connected to the first gear and the second gear and enables the first gear and the second gear to rotate synchronously and in opposite rotation directions.

[0020] By adopting the above technical solution, the rotation of the first main shaft drives the rotation of multiple cams and the first gear. The rotation of the first gear drives the rotation of the second gear through the linkage component. The rotation of the second gear drives the rotation of the second main shaft and multiple vector gears, thereby enabling multiple cams and multiple vector gears to rotate synchronously, further improving the stability during the transmission process, and improving the stability and transmission efficiency during the transmission process.

[0021] At the same time, through the design of the linkage component, the synchronous rotation of the first gear and the second gear is realized, and at the same time, the sizes of the first gear, the second gear and the linkage component are reduced, thereby improving the stability and transmission efficiency during the transmission process and meeting the effect of a small transmission structure at the same time.

[0022] Optionally, the linkage component includes: A first linkage gear and a second linkage gear, which are meshed with each other and are respectively meshed with the first gear and the second gear.

[0023] By adopting the above technical solution, the simultaneous rotation of the first gear and the second gear is realized, and at the same time, the parameters of the first gear and the second gear can be designed according to needs, so that the first gear and the second gear rotate synchronously and in opposite rotation directions, so as to enable the first gear and the second gear to rotate synchronously and in opposite rotation directions.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. During the meshing process of the cam and the vector groove, the elastic member is pressed against the cam under the action of elastic force. After the cam rotates and squeezes the elastic member and enters the clamping groove, the cam and the vector groove are meshed, thus greatly increasing the contact area when the cam and the vector groove are meshed, making the transmission process more stable, and thus improving the stability and transmission efficiency during the transmission process.

[0025] 2. When the elastic member is not squeezed, there is a certain clearance buffer at the connection between the connecting portion and the two clamping grooves; after the elastic member is squeezed, the connecting portion can approach and abut against the connection between the two clamping grooves for positioning, so as to achieve buffering, reducing the risk of damage to the elastic member after being squeezed, and improving the stability and transmission efficiency during the transmission process. Brief Description of the Drawings

[0026] Figure 1 is a three-dimensional structural schematic diagram of the transmission structure; Figure 2 is a structural schematic diagram of a single vector gear in the transmission structure and its structure located on the vector gear; Figure 3 is Figure 2 a sectional schematic diagram of A-A in Figure 4 is Figure 3 an enlarged schematic diagram of part B in Figure 5 is Figure 3 an enlarged schematic diagram of part C in

[0027] Reference Signs: 11, the first main shaft; 12, the second main shaft; 13, the cam; 14, the vector gear; 15, the vector groove; 16, the clamping groove; 17, the through hole; 18, the mounting hole; 19, the moving hole; 2, the elastic member; 21, the pressing portion; 22, the connecting portion; 3, the connecting assembly; 31, the inserting column; 32, the connecting screw; 4, the limiting assembly; 41, the limiting plate; 42, the limiting screw; 43, the moving column; 5, the linkage mechanism; 51, the first gear; 52, the second gear; 6, the linkage assembly; 61, the first linkage gear; 62, the second linkage gear. Detailed Embodiment

[0028] The following further elaborates on the present application in detail.

[0029] The embodiment of the present application discloses an external meshing transmission structure of a cam and a vector gear.

[0030] Referring to Figure 1 and Figure 2, a cam and external meshing transmission structure of a vector gear, comprising a first main shaft 11, a second main shaft 12, a plurality of cams 13 and a plurality of vector gears 14 arranged on the first main shaft 11 and the second main shaft 12. A plurality of vector slots 15 meshing with the cams 13 are arranged in a circumferential array around the axis of the vector gear 14. The structure further includes a plurality of elastic members 2 detachably arranged on the vector gear 14 through a connecting assembly 3. A clamping groove 16 is formed on each of the plurality of vector slots 15. The plurality of elastic members 2 are arranged in one-to-one correspondence with the plurality of clamping grooves 16 and are elastic. Both ends of the elastic member 2 are located in the clamping groove 16, and other parts extend outside the clamping groove 16 under the action of elastic force to form a pressing portion 21. When the cam 13 meshes with the vector slot 15, the pressing portion 21 is extruded and moves into the clamping groove 16.

[0031] Referring to Figures 2 - 4 , the plurality of clamping grooves 16 are arranged along the arc of the vector slot 15, and both ends of the plurality of clamping grooves 16 communicate with each other. After the plurality of elastic members 2 are connected to each other, an elastic body is formed. The connecting assembly 3 includes two inserting columns 31 and a connecting screw 32. Through holes 17 are formed at one ends of the two clamping grooves 16 close to each other, and the through holes 17 penetrate through the two clamping grooves 16; the two inserting columns 31 are fixedly installed at both ends of the elastic body and are inserted and installed in the through holes 17 from both ends of the through holes 17; the connecting screw 32 passes through one end of the elastic body and the inserting column 31 and is threadedly connected to the other inserting column 31, so as to enable the elastic body to be clamped and installed in the clamping groove 16.

[0032] Referring to Figures 2 - 5 , a bent connecting portion 22 is formed at the connection of two adjacent elastic members 2. The connecting portion 22 cooperates with the connection of two adjacent clamping grooves 16. When the elastic member 2 is extruded, the connecting portion 22 is driven to abut against the connection of the two clamping grooves 16 for positioning. A limiting assembly 4 is arranged on the two clamping grooves 16 on both sides of the connecting portion 22. The limiting assembly 4 enables one end of the elastic member 2 close to the connecting portion 22 to be located in the clamping groove 16 and allows the elastic member 2 to move within a certain range when being extruded; the two elastic members 2 close to the connecting screw 32 are limited by the connecting screw 32 and the limiting assembly 4, and the other elastic members 2 are limited by the limiting assembly 4 at both ends thereof. Other parts of the elastic member 2 extend outside the clamping groove 16 under the action of elastic force to form a pressing portion 21. At the same time, a wavy corrugated portion is formed on the elastic member 2 and / or the pressing portion 21.

[0033] An installation hole 18 penetrating through the two clamping grooves 16 is formed at one end of two adjacent clamping grooves 16 close to each other and at the position of the connecting portion 22. The cross section of the clamping groove 16 is trapezoidal, and the width on the side close to the vector slot 15 is greater than the width on the side far from the vector slot 15, so as to facilitate the placement of the elastic body into the plurality of clamping grooves 16.

[0034] The limiting component 4 includes two limiting plates 41 and a limiting screw 42. The two limiting plates 41 are both snap-fitted and installed on the snap-fitting grooves 16 on both sides of the connecting portion 22. The width of the limiting plate 41 is greater than the minimum width of the snap-fitting groove 16 and less than the maximum width of the snap-fitting groove 16, so that an elastic member 2 forms a moving space for the elastic member 2 to move between the limiting plate 41 and the bottom of the snap-fitting groove 16. At the same time, a moving hole 19 is formed in the elastic member 2 at the position of the limiting plate 41 along the moving direction of the elastic member 2; moving columns 43 passing through the moving hole 19 and inserted and installed on the mounting holes 18 are fixedly installed on both limiting plates 41, and the moving columns 43 are slidably connected to the moving hole 19.

[0035] After positioning both ends of the elastic body through the connecting screw 32, then the moving columns 43 on the two limiting plates 41 pass through the two moving holes 19 and are inserted and installed at both ends of the mounting hole 18. Then, the limiting screw 42 passes through one of the limiting plates 41 and the moving column 43 and is threadedly connected to the other moving column 43, so as to fix the two limiting plates 41, and then install the limiting plates 41 at other parts, thereby realizing the limitation of both ends of multiple elastic members 2. Before the elastic member 2 is squeezed, there is a certain distance from the connection part of the two snap-fitting grooves 16, and after the elastic member 2 is squeezed, it drives the connecting portion 22 to approach and abut against the connection part of the adjacent two snap-fitting grooves 16 for positioning, thereby improving the stability of the elastic member 2 during use and improving the stability and transmission efficiency of the transmission structure.

[0036] Refer to Figure 1 It further includes a linkage mechanism 5 connecting the main shaft one 11 and the main shaft two 12 and enabling the main shaft one 11 and the main shaft two 12 to rotate synchronously. The linkage mechanism 5 includes a first gear 51, a second gear 52, and a linkage component 6. The first gear 51 and the second gear 52 are respectively key-connected to the main shaft one 11 and the main shaft two 12; the linkage component 6 is located between the main shaft one 11 and the main shaft two 12, and the linkage component 6 is connected to the first gear 51 and the second gear 52 and enables the first gear 51 and the second gear 52 to rotate synchronously and in opposite rotation directions.

[0037] The linkage component 6 includes a first linkage gear 61 and a second linkage gear 62. The first linkage gear 61 and the second linkage gear 62 are located between the first gear 51 and the second gear 52. The first linkage gear 61 and the second linkage gear 62 are meshed with each other and are respectively meshed with the first gear 51 and the second gear 52. When the transmission structure is installed on a component for use, the first gear 51 and the second gear 52 are also rotatably installed on the component for support. At the same time, the parameters of the first gear 51, the second gear 52, the first linkage gear 61, and the second linkage gear 62 are designed according to actual needs, so as to meet the synchronous rotation and opposite rotation directions of multiple cams 13 and multiple vector gears 14.

[0038] The working principle of the embodiment of the present application is as follows: The first main shaft 11 and the second main shaft 12 achieve synchronous rotation through the linkage mechanism 5 and rotate in opposite directions. The rotation of the first main shaft 11 drives the rotation of a plurality of cams 13. The rotation of the cams 13 engages with the vector slots 15, so that both the elastic member 2 and the pressing portion 21 are rotated into the clamping slots 16. When the cams 13 move away from the vector slots 15 with which they engage, the pressing portion 21 continues to press against the cams 13 under the action of elastic force until the pressing portion 21 disengages from the cams 13. The meshing conditions of the other cams 13 with the vectors are the same, thus greatly increasing the contact area when the cams 13 engage with the vector slots 15 and improving the stability and transmission efficiency during the transmission process.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A cam and vector gear external meshing transmission structure, comprising a main shaft (11), a main shaft (12), a plurality of cams (13) and a plurality of vector gears (14) arranged on the main shaft (11) and the main shaft (12), wherein the vector gears (14) are provided with a plurality of vector grooves (15) meshing with the cams (13), characterized in that: It also comprises a plurality of elastic members (2) which are detachably arranged on the vector gear (14) through a connecting assembly (3), a plurality of the vector slots (15) are each provided with a clamping slot (16), the plurality of the elastic members (2) are arranged in a one-to-one correspondence with the plurality of the clamping slots (16), both ends of the elastic members (2) are located in the clamping slots (16) and extend out of the clamping slots (16) under the action of elastic force to form a pressing portion (21), and when the cam (13) is engaged with the vector slot (15), the pressing portion (21) is pressed and moved into the clamping slot (16).

2. The cam and vector gear external meshing transmission structure according to claim 1, characterized in that: The plurality of snap-fit ​​grooves (16) are interconnected and enable the plurality of elastic members (2) to be interconnected.

3. The cam and vector gear external meshing transmission structure according to claim 2, characterized in that: A plurality of the elastic members (2) are connected to each other to form an elastic body, and the connecting assembly (3) comprises: Two plug-in posts (31) are arranged on both ends of the elastic body and are plugged and installed on the clamping groove (16) for positioning; The connecting screw (32) passes through one of the plug-in posts (31) and is threadedly connected to the other plug-in post (31) and is located in the clamping groove (16).

4. The cam and vector gear external meshing transmission structure according to claim 3, characterized in that: The connection between two adjacent elastic members (2) forms a connecting portion (22) in a bent shape and cooperates with the connection between two adjacent clamping grooves (16); before being squeezed, the elastic member (2) maintains a certain distance from the connection between the two clamping grooves (16) and after being squeezed, drives the connecting portion (22) to abut against the connection between the two clamping grooves (16) for positioning; and two clamping grooves (16) located on both sides of the connecting portion (22) are provided with a limiting component (4), and the limiting component (4) enables an end of the elastic member (2) close to the connecting portion (22) to be located in the clamping groove (16) and to enable the elastic member (2) to move within a certain range when being squeezed.

5. The cam and vector gear external meshing transmission structure according to claim 4, characterized in that: The cross section of the clamping groove (16) is trapezoidal and is convenient for the elastic member (2) to be inserted. The elastic member (2) is provided with a moving hole (19). The limiting assembly (4) comprises: Two limit plates (41) are mounted on the clamping grooves (16) located on both sides of the connecting portion (22), the limit plates (41) cooperate with the clamping grooves (16) to form a moving space for the elastic member (2) to move, and the two limit plates (41) are each provided with a moving column (43) that passes through the moving hole (19) and is slidably connected to the moving hole (19) and is clamped and matched with the clamping grooves (16); The limiting screw (42) passes through one of the limiting plates (41) and the moving column (43) and is threadedly connected to the other moving column (43).

6. The cam and vector gear external meshing transmission structure according to claim 1, characterized in that: The elastic member (2) is provided with a corrugated portion in a corrugated shape.

7. The cam and vector gear external meshing transmission structure according to claim 1, characterized in that: It also includes a linkage mechanism (5) that connects the first spindle (11) and the second spindle (12) and enables the first spindle (11) and the second spindle (12) to rotate synchronously.

8. The cam and vector gear external meshing transmission structure according to claim 7, characterized in that: The linkage mechanism (5) comprises: A first gear (51) and a second gear (52) are respectively arranged on the first main shaft (11) and the second main shaft (12); The linkage assembly (6) is located between the first main shaft (11) and the second main shaft (12) and is connected to the first gear (51) and the second gear (52) so as to enable the first gear (51) and the second gear (52) to rotate synchronously and in opposite directions.

9. The cam and vector gear external meshing transmission structure according to claim 8, characterized in that: The linkage component (6) comprises: The first linkage gear (61) and the second linkage gear (62) are meshed with each other and are respectively meshed with the first gear (51) and the second gear (52).

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