A helical anti-backlash gear assembly

Abstract

The utility model relates to a kind of spin in anti-backlash gear assembly, including shaft body, first gear, second gear, anti-backlash unit and locking unit;First gear is sleeved on shaft body and rotates with it;Second gear is engaged transmission with first gear;Anti-backlash unit includes anti-backlash gear, anti-backlash gear ring and straight sliding block;Anti-backlash gear is sleeved to the outside of shaft body and can rotate relative thereto, one tooth is engaged into the engagement tooth groove of second gear with anti-backlash gear;Anti-backlash gear ring is coaxially fixed in the side of anti-backlash gear away from first gear and is equipped with inclined groove;Straight sliding block is coaxially fixed in the side of anti-backlash gear ring away from anti-backlash gear and is equipped with inclined guide rail, after being correspondingly inserted into inclined groove, the anti-backlash between first gear and second gear can be completed;Locking unit includes first spin sliding block;First spin sliding block is sleeved to the outside of shaft body and is threadedly connected with it, straight sliding block is pressed to anti-backlash gear ring.The utility model has the advantages of meeting the use requirement of large torque gear and being easy to install and disassemble.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology, and in particular to a backlash-eliminating gear assembly. Background Technology

[0002] Gear transmission is a common mechanical transmission method. It transmits power through the meshing of the teeth of two parallel-axis driving and driven gears. The distance between the teeth of the driving and driven gears affects the accuracy of the gear transmission. Therefore, in existing technologies, after the two gears are pre-installed, the backlash between the teeth generally needs to be adjusted to reduce it. Consequently, various backlash elimination structures have emerged. Among them, relying on the elastic force of spring plates or other elastic elements to achieve backlash elimination by misalignment of the two gears is a relatively common method.

[0003] Please see Figure 1 The existing gear backlash elimination structure includes a shaft 1, a fixed gear 2, and a misalignment unit. The misalignment unit includes a misalignment gear 3 and a spring 5. The fixed gear 2 meshes with an external gear for transmission, and is coaxially connected to the shaft 1. The misalignment gear 3 is mounted on the shaft 1, close to the fixed gear 2, and can rotate relative to the fixed gear 2 around the axis of the shaft 1. The misalignment gear 3 has a through hole 6 extending circumferentially along the shaft 1, and a second fixing rod 4b is provided next to the through hole. The fixed gear 2 has a first fixing rod 4a, which passes through the through hole 6. A spring 5 is placed between the first fixing rod 4a and the second fixing rod 4b, with its two ends fixed to the first fixing rod 4a and the second fixing rod 4b respectively, and is in a compressed state. Because the spring 5 is compressed, it applies opposite elastic forces to the first fixing rod 4a and the second fixing rod 4b respectively. The fixed gear 2 and the misalignment gear 3 rotate in opposite directions under the action of the elastic forces, thereby abutting against two opposing tooth surfaces in the same meshing groove of the external gear, thus eliminating backlash between the external gear and the fixed gear 2.

[0004] However, when using the aforementioned gear backlash elimination structure, the rotary backlash elimination gear assembly often suffers from inaccurate finished product dimensions and low yield when machining parts on industrial machine tools. This is especially true when performing high-torque, high-precision transmissions, and after the transmission device has been used for a period of time. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and to provide a backlash-free gear assembly.

[0006] This utility model is achieved through the following technical solution: a backlash-eliminating gear assembly, comprising a shaft, a first gear, a second gear, a backlash-eliminating unit, and a locking unit; the shaft extends along an axis; the first gear is sleeved on the shaft and rotates therewith; the second gear meshes with the first gear; the backlash-eliminating unit includes a backlash-eliminating gear, a backlash-eliminating gear ring, and a straight slider; the backlash-eliminating gear is sleeved on the shaft and can rotate relative to it, one side of the backlash-eliminating gear abuts against the first gear, and one tooth of the backlash-eliminating gear and one tooth of the first gear simultaneously mesh with one meshing groove of the second gear; the backlash-eliminating gear ring is coaxially fixed to the backlash-eliminating unit. The backlash-eliminating gear is located on the side away from the first gear; the straight slider is sleeved on the shaft body and located on the side of the backlash-eliminating ring away from the backlash-eliminating gear. One of the backlash-eliminating gear and the straight slider is recessed with several inclined grooves, and the other is protruded with several inclined guide rails. After the inclined guide rails are inserted into the inclined grooves, they enable the two opposite tooth surfaces of the first gear and the backlash-eliminating gear to abut against the two opposite tooth surfaces in the same meshing groove of the second gear. The locking unit includes a first rotary slider. The first rotary slider is sleeved on the shaft body and threadedly connected to it. The first rotary slider abuts against the straight slider and presses the straight slider against the backlash-eliminating ring.

[0007] Compared with the prior art, the backlash elimination gear assembly provided by this utility model has an ingenious structural design. It uses the cooperation of inclined guide rail and inclined groove to achieve high-precision backlash elimination. Moreover, the backlash elimination method is not limited by spring plates or springs and can provide sufficient force to meet the requirements of high torque gears. Furthermore, the main structural components of the backlash elimination gear assembly are all mounted on the same shaft, making installation convenient and simple.

[0008] Furthermore, the inclined groove has a first opening on the side near the backlash-eliminating gear and a second opening on the side away from the backlash-eliminating gear. When the inclined groove is projected along the axial direction of the shaft, in the circumferential direction of the shaft, the first opening is close to the tooth surfaces of the first gear and the second gear in the same meshing tooth groove, and the second opening is close to the tooth surfaces of the backlash-eliminating gear and the second gear in the same meshing tooth groove. The extension direction of the inclined guide rail is parallel to the extension direction of the inclined groove. When the straight slider is pushed into the backlash-eliminating gear ring, the backlash-eliminating gear ring rotates relative to the first gear, and the rotation direction is opposite to the rotation direction of the first gear. Therefore, the backlash-eliminating gear will be subjected to a reaction force pointing axially towards the protrusion to press the first gear, thereby eliminating the coarse installation gap between the backlash-eliminating gear and the first gear.

[0009] Furthermore, the locking unit also includes a second rotary slider, which is sleeved onto the shaft body and located on the side of the first rotary slider away from the straight slider. The second rotary slider is threadedly connected to the shaft body, and there is a gap between the second rotary slider and the first rotary slider, leaving space for bringing the first rotary slider and the second rotary slider closer together.

[0010] Furthermore, the locking unit also includes several screws and several nuts. The first rotary slider has several screw holes, and the second rotary slider has several light holes corresponding to the screw holes. Each screw is installed on the screw hole by passing through the light hole. The nuts are tightened to press the first rotary slider and the second rotary slider together. At this time, the threads of the two rotary sliders and the shaft are pressed against each other, increasing the static friction and preventing the first rotary slider from slipping out.

[0011] Furthermore, a threaded groove for threaded connection with the first rotary slider is provided on the side of the shaft away from the first gear. A straight groove extending axially along the shaft is provided on the threaded groove, and the length of the straight groove is greater than or equal to the length of the threaded groove. An opening is provided in the middle of the straight slider, and a straight guide rail extending axially along the shaft is provided on its inner sidewall. The straight guide rail is engaged in the straight groove, so that the straight slider can slide along the shaft.

[0012] Furthermore, the backlash elimination unit also includes a connecting plate, which is fixedly disposed on the end face of the backlash elimination gear ring facing the backlash elimination gear. One side of the connecting plate opposite to the backlash elimination gear has a protruding boss, and the other side has a recessed portion. The boss is inserted into the recessed portion to realize a detachable connection between the backlash elimination gear ring and the backlash elimination gear.

[0013] Furthermore, the connecting plate is fixedly connected to the backlash-eliminating gear by screws, which facilitates installation and disassembly.

[0014] Furthermore, the end of the shaft away from the backlash elimination unit is provided with a protrusion surrounding the outside of the shaft, and the first gear abuts against the protrusion to prevent the first gear from sliding out of the shaft from the end away from the backlash elimination unit.

[0015] Furthermore, a flat key protrudes from the outer peripheral surface of the shaft, and a through hole is provided in the middle of the first gear. A groove is provided on its inner sidewall. The flat key engages with the groove, so that the first gear cannot rotate relative to the shaft, thereby realizing a detachable connection between the shaft and the first gear.

[0016] Furthermore, the recesses on the backlash-eliminating gear and the bosses on the connecting plate are evenly distributed and correspond one-to-one along the circumference of the shaft, and / or the inclined guide rail and the inclined groove are evenly distributed and correspond one-to-one along the circumference of the shaft, and / or the screw holes on the first rotary slider and the light holes on the second rotary slider are evenly distributed and correspond one-to-one along the circumference of the shaft, so that the axial force generated by screwing into the first rotary slider and pointing towards the straight slider can be more evenly distributed on the straight slider, and thus act more evenly on the backlash-eliminating gear ring, driving the backlash-eliminating gear to rotate and generate misalignment, thereby achieving further backlash elimination between the second gear and the first gear.

[0017] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a gear backlash elimination structure in the prior art; Figure 2 This is an exploded view of the overall structure of the backlash-free gear assembly of this utility model; Figure 3 This is a partial structural schematic diagram of the backlash-eliminating gear assembly of this utility model; Figure 4 This is a schematic diagram of the structure of the shaft of this utility model; Figure 5 This is a schematic diagram of the structure of the first gear of this utility model; Figure 6 This is a schematic diagram of the backlash-free gear of this utility model; Figure 7 This is a schematic diagram of the connecting plate of this utility model; Figure 8 This is a schematic diagram of the backlash-eliminating toothed ring of this utility model; Figure 9 This is a schematic diagram of the first and second gears of this utility model meshing. Figure 10 This is a schematic diagram of the structure of the first rotary slider of this utility model; Figure 11 This is a schematic diagram of the structure of the second rotary slider of this utility model.

[0019] Figure label: 1. Shaft; 2. Fixed gear; 3. Offset gear; 4a. First fixed rod; 4b. Second fixed rod; 5. Spring; 6. Through hole; 10. Shaft body; 12. Threaded groove; 14. Straight groove; 16. Protrusion; 18. Keyway; 19. Flat key; 20. First gear; 22. Groove; 30. Backlash elimination unit; 32. Backlash elimination gear; 322. Recess; 34. Connecting plate; 342. Boss; 36. Backlash elimination gear ring; 362. Inclined groove; 38. Straight slider; 382. Inclined guide rail; 384. Straight guide rail; 40. Locking unit; 42. First rotary slider; 422. Threaded opening; 424. Screw hole; 44. Second rotary slider; 442. Threaded hole; 444. Plain hole; 46. Screw; 48. Nut; 50. Second gear. Detailed Implementation

[0020] To address the issues of inaccurate finished product dimensions and low yield rates that commonly occur in actual industrial machine tool systems, the applicant conducted research and analysis on existing backlash-eliminating gear assemblies. The findings revealed that most existing backlash-eliminating gear assemblies utilize the elastic force of springs or other elastic components to misalign the two gears. Since the magnitude of this elastic force is determined by the spring's properties: if the spring rigidity is too low, the backlash-eliminating gear assembly often suffers from insufficient elasticity when providing large torques, resulting in incomplete backlash elimination; if the spring rigidity is too high, it increases the pressure on the two sides of the meshing tooth grooves, thereby increasing friction and wear, and reducing accuracy after long-term use. Therefore, selecting the right spring is challenging. Even if a suitable spring is provided, it will fatigue with increasing usage time, reducing the elastic force provided and consequently decreasing the accuracy of the inter-tooth clearance.

[0021] Therefore, based on the existing screw-in backlash elimination gear assembly, this utility model changes the backlash elimination method from using a spring to a backlash elimination method using a slanted guide rail and a slanted groove. The relative sliding of the slanted guide rail and the slanted groove causes the two gears to remain misaligned and abut against two opposing tooth surfaces in the same meshing tooth groove. Therefore, the backlash elimination of the screw-in backlash elimination gear assembly is not limited by the spring, and the slanted guide rail and the slanted groove have high rigidity and can provide sufficient force to meet the requirements of high torque gears. In addition, the main structural components of the screw-in backlash elimination gear assembly are all mounted on the same shaft, making installation convenient and simple.

[0022] Please see Figure 2 , 39. The backlash-eliminating gear assembly of this utility model includes a shaft 10, a first gear 20, a backlash-eliminating unit 30, a locking unit 40, and a second gear 50. The first gear 20 is sleeved on one axial end of the shaft 10 and rotates accordingly. The axis of the second gear 50 is parallel to the axis of the first gear 20 and meshes with it for transmission. The first gear 20 serves as either a driving gear or a driven gear, while the second gear 50 serves as either a driven gear or a driving gear. The backlash-eliminating unit 30 is disposed axially on the shaft 10 and abuts against the first gear 20. The first gear 20 and the backlash-eliminating unit 30 respectively mesh into the same meshing tooth groove of the second gear 50 and abut against two opposite tooth surfaces of the meshing tooth groove. The locking unit 40 is located on the side of the backlash-eliminating unit 30 facing away from the first gear 20 and is close to the backlash-eliminating unit 30 to press and lock the backlash-eliminating unit 30 and the first gear 20 together.

[0023] Specifically, please refer to Figure 4-5 The shaft 10 has a smooth upper end, and the first gear 20 is sleeved on the outer side of its smooth side and rotates with the shaft 10. The other end of the shaft 10 has a threaded groove 12 extending along its axial direction for engaging with the locking unit 40. Preferably, the shaft 10 and the first gear 20 are detachably connected. In this embodiment, a protrusion 16 is provided at the end of the shaft 10 away from the backlash elimination unit 30. The protrusion 16 surrounds the outside of the shaft 10, and the first gear 20 abuts against the protrusion 16 to prevent the first gear 20 from sliding out of the shaft 10 from the end away from the backlash elimination unit 30. Furthermore, a keyway 18 is recessed on the outside of the shaft 10, and a flat key 19 that matches the keyway 18 is engaged in the keyway 18. At least a portion of the flat key 19 protrudes out of the outside of the keyway 18. Correspondingly, a through hole is provided in the middle of the first gear 20, and a groove 22 extending axially along the shaft 10 is provided on its inner sidewall. The flat key 19 is engaged in the groove 22, so that the first gear 20 cannot rotate relative to the shaft 10, thereby enabling the shaft 10 to drive the first gear 20 to rotate.

[0024] Please see Figure 6-9The backlash elimination unit 30 includes a backlash elimination gear 32, a backlash elimination gear ring 36, and a straight slider 38. The backlash elimination gear 32 is sleeved on the outside of the shaft 10, with one side abutting against the first gear 20 and capable of rotating relative to the shaft 10. The tooth configuration of the backlash elimination gear 32 is correspondingly set to the tooth configuration of the first gear 20, so that one tooth of the backlash elimination gear 32 and one tooth of the first gear 20 can simultaneously mesh with the same meshing groove of the second gear 50. The backlash elimination gear ring 36 is a cylindrical ring with a through hole inside, coaxially fixed on the side of the backlash elimination gear 32 away from the first gear 20, and a plurality of inclined grooves 362 are provided axially through the inner wall of the backlash elimination gear ring 36. The straight slider 38 is sleeved outside the shaft 10, and the backlash-eliminating gear ring 36 is located between the straight slider 38 and the first gear 20. The straight slider 38 can be embedded into the backlash-eliminating gear ring 36. Several inclined guide rails 382 are distributed circumferentially on the outer periphery of the straight slider 38. The inclined guide rails 382 are correspondingly inserted into the inclined grooves 362 of the backlash-eliminating gear ring 36. In the direction from the first gear 20 to the backlash-eliminating gear ring 36, the inclined grooves 362 and the inclined guide rails 382 are inclined away from the tooth surface that abuts the first gear 20 and the second gear 50. When the straight slider 38 is pushed into the backlash-eliminating gear ring 36, the backlash-eliminating gear ring 36 rotates relative to the first gear 20. In the same meshing groove, the two opposite tooth surfaces of the first gear 20 and the backlash-eliminating gear 32 abut against the two opposite tooth surfaces in the same meshing groove of the second gear 50.

[0025] Specifically, in this embodiment, the inclined groove 362 has a first opening 362a on the side near the backlash-eliminating gear 32 and a second opening 362b on the side away from the backlash-eliminating gear 32. When the inclined groove 362 is projected along the axial direction of the shaft 10, in the circumferential direction of the shaft 10, the first opening 362a is close to the tooth surfaces of the first gear 20 and the second gear 50 in the same tooth groove, and the second opening 362b is close to the tooth surfaces of the backlash-eliminating gear 32 and the second gear 50 in the same tooth groove; the extending direction of the inclined guide rail 382 is parallel to the extending direction of the inclined groove 362. For example, if the rotation direction of the first gear 20 is clockwise, the straight slider 38 pushes into the backlash-eliminating gear ring 36, and the inclined guide rail 382 pushes the inclined groove 362, causing the backlash-eliminating gear ring 36 to rotate counterclockwise, thereby driving the backlash-eliminating gear 32 to rotate counterclockwise to eliminate backlash.

[0026] Furthermore, in this embodiment, the inclined groove 362 is recessed inside the backlash-eliminating gear ring 36, and the inclined guide rail 382 protrudes from the outer periphery of the straight slider 38. However, according to actual needs, the inclined guide rail 382 can be protruded into the backlash-eliminating gear ring 36, and the inclined groove 362 can be set outside the straight slider 38. Similarly, the backlash-eliminating gear ring 36 rotates relative to the first gear 20.

[0027] Furthermore, the connection between the backlash-eliminating gear 32 and the backlash-eliminating ring 36 is preferably a detachable connection. The backlash-eliminating unit 30 also includes a connecting plate 34, which is sleeved onto the shaft 10 and fixedly installed on the end face of the backlash-eliminating ring 36 facing the backlash-eliminating gear 32. A boss 342 is provided on the end face of the connecting plate 34 facing the backlash-eliminating gear 32; correspondingly, a recess 322 is provided on the end face of the backlash-eliminating gear 32 facing the connecting plate 34. The boss 342 can be inserted into the recess 322 on the backlash-eliminating gear 32 to achieve positioning between the backlash-eliminating ring 36 and the backlash-eliminating gear 32. In this embodiment, the end face of the backlash-eliminating ring 36 facing the connecting plate 34 has several screw holes, and correspondingly, the end face of the connecting plate 34 facing the backlash-eliminating ring 36 has several flat-head screw holes. The flat-head screw holes on the connecting plate 34 are aligned with the screw holes on the backlash-eliminating ring 36, and the connecting plate 34 and the backlash-eliminating ring 36 are fixedly connected together by screws.

[0028] Preferably, in order to enable the straight slider 38 to advance along the axial direction of the shaft 10 in the backlash-eliminating ring 36 to achieve a better backlash elimination effect, in this embodiment, a straight groove 14 is also provided on the outer side of the location of the threaded groove 12 in the shaft 10. The straight groove 14 extends along the axial direction of the shaft 10, and its length is greater than or equal to the length of the threaded groove 12. Correspondingly, the straight slider 38 has an opening in the middle, and a straight guide rail 384 extending along the axial direction of the shaft 10 is provided on its inner sidewall. The straight guide rail 384 is inserted into the straight groove 14 of the shaft 10, so that the straight slider 14 can slide along the shaft 10.

[0029] Please see Figure 10-11 The locking unit 40 includes a first rotary slider 42, which is sleeved on the outside of the shaft 10 and located on the side of the straight slider 38 away from the backlash-eliminating gear 32. The middle part has a threaded opening 422 that is threadedly connected to the threaded groove 12 for threaded connection with the shaft 10. Rotating the first rotary slider 42 to move it toward the straight slider 38 can press and lock the straight slider 38 in the backlash-eliminating gear ring 36.

[0030] As a further optimization of the above scheme, the locking unit 40 also includes a second rotary slider 44, several screws 46 and several nuts 48. The first rotary slider 42 is also provided with several axially penetrating screw holes 424. The second rotary slider 44 is sleeved on the outside of the shaft 10 and located on the side of the first rotary slider 42 away from the straight slider 38, and has a threaded hole 442 in the middle that is threaded to the threaded groove 12. Rotating the second rotary slider 44 brings it closer to the first rotary slider 42 and leaves a gap between them. The second rotary slider 44 is provided with several axially penetrating light holes 444. The screw 44 is aligned with the screw hole 424 on the first sliding block 42; the screw 46 passes through the aperture 444 of the second sliding block 44 and is installed on the screw hole 424 of the first sliding block 42; the nut 48 is threadedly connected to the screw 46 and is located on the side of the second sliding block 44 away from the first sliding block 42. Tightening the screw 46 by screwing in the nut 48 reduces the distance between the first sliding block 42 and the second sliding block 44. At this time, the first sliding block 42 and the second sliding block 44 press against the threads on the shaft 10 in their gap, thereby increasing the static friction and further locking the first sliding block 42 onto the shaft 10. In this embodiment, the number of screw holes 424 on the first sliding block 42, aperture 444 on the second sliding block 44, screw 46 and nut 48 are all 4 and are evenly distributed circumferentially, corresponding one-to-one, to achieve the purpose of uniform force distribution.

[0031] Furthermore, when the recesses 322 on the backlash-eliminating gear 32 and the bosses 342 on the connecting plate 34 are evenly distributed and correspond one-to-one in the circumferential direction, the flat-head screw holes on the connecting plate 34 and the screw holes on the backlash-eliminating gear ring 36 are evenly distributed and correspond one-to-one in the circumferential direction, the inclined guide rails 382 on the straight slider 38 and the inclined grooves 362 on the backlash-eliminating gear ring 36 are evenly distributed and correspond one-to-one in the circumferential direction, and the size and shape of the first rotary slider 42 and the straight slider 38 are consistent, the axial force pointing towards the straight slider 38 generated by rotating the first rotary slider 42 can be more evenly distributed on the straight slider 38, and thus more evenly act on the backlash-eliminating gear ring 36 to drive the backlash-eliminating gear 32 to rotate and generate misalignment, thereby achieving further backlash elimination between the second gear 50, the first gear 20, and the backlash-eliminating gear ring 36.

[0032] When installing the backlash-eliminating gear assembly of this utility model, first insert the flat key 19 into the keyway 18, then sleeve the first gear 20 on the outside of the shaft 10, abutting against the side of the protrusion 16 facing the threaded groove 12, with the groove 22 of the first gear 20 holding the flat key 19; next, sleeve the backlash-eliminating gear 32 on the outside of the shaft 10, with the end face of the recess 322 facing outward, and one tooth of the first gear 20 abutting against the first tooth surface on one side of a meshing groove of the second gear 50, at this time the first gear is completed. The initial backlash between gear 20 and the second gear 50 is eliminated; then, the fixedly connected connecting plate 34 and backlash-eliminating gear ring 36 are fitted onto the shaft 10, with the boss 342 on the connecting plate 34 correspondingly inserted into the recess 322 on the backlash-eliminating gear 32; next, the straight slider 38 is fitted onto the shaft 10, with the straight guide rail 384 on the straight slider 38 correspondingly inserted into the straight groove 14 of the shaft 10, and the inclined guide rail 382 on the straight slider 38 correspondingly inserted into the inclined groove 362 of the backlash-eliminating gear ring 36, so that when the straight… When slider 38 is pushed into the backlash-eliminating gear ring 36, the backlash-eliminating gear ring 36 rotates relative to the first gear 20, and its gear facing away from the first tooth surface turns to the second tooth surface in the same tooth groove of the second gear 50, which is opposite to the first tooth surface. Then, the first rotary slider 42 is screwed into the shaft 10 and moves towards the straight slider 38. As the first rotary slider 42 is screwed in, the straight slider 38 is pushed into the backlash-eliminating gear ring 36 by its axial force, and the inclined groove 362 of the backlash-eliminating gear ring 36 is subjected to force, so that the backlash-eliminating gear... Ring 36 continues to rotate relative to backlash-eliminating gear 32 until misalignment and backlash elimination are completed. After misalignment and backlash elimination are completed, since the straight guide rail 384 of the straight slider 38 engages in the straight groove 14, the straight slider 38 rotates with the shaft 10, thereby driving the backlash-eliminating gear ring 36 and backlash-eliminating gear 32 to rotate synchronously with the shaft 10. Since the first gear 20 also rotates synchronously with the shaft 10, the first gear 20 can maintain synchronous rotation with the backlash-eliminating gear 32, so the gap between the two relative to the second gear 50 remains unchanged.

[0033] Compared with the prior art, the rotary backlash elimination gear assembly transmission device of this utility model has the following advantages: the backlash elimination of the rotary backlash elimination gear assembly is not limited by the spring and the force is uniform, which can provide sufficient force to meet the requirements of high torque gears; while eliminating gear backlash, it can also eliminate the coarse installation gap between the main structural components on the shaft; the main structural components of the rotary backlash elimination gear assembly are all sleeved on the same shaft and adopt a detachable connection method, making installation, disassembly and replacement more convenient and simple.

[0034] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A backlash-free gear assembly, characterized in that: include A shaft extending along an axis; A first gear, which is sleeved on the shaft and rotates accordingly; The second gear meshes with the first gear for transmission; The backlash elimination unit includes a backlash elimination gear, a backlash elimination gear ring, and a straight slider. The backlash elimination gear is sleeved on the shaft body and can rotate relative to it. One side of the backlash elimination gear abuts against the first gear, and one tooth of the backlash elimination gear and one tooth of the first gear simultaneously mesh with one meshing groove of the second gear. The backlash elimination gear ring is coaxially fixed on the side of the backlash elimination gear away from the first gear. The straight slider is sleeved on the shaft body and located on the side of the backlash elimination gear ring away from the backlash elimination gear. One of the backlash elimination gear and the straight slider has a plurality of recessed grooves, and the other has a plurality of protruding inclined guide rails. After the inclined guide rails are inserted into the corresponding grooves, they enable two opposite tooth surfaces of the first gear and the backlash elimination gear to abut against two opposite tooth surfaces in the same meshing groove of the second gear. as well as The locking unit includes a first rotary slider; the first rotary slider is sleeved onto the shaft body and threadedly connected thereto, the first rotary slider abuts against the straight slider and presses the straight slider against the backlash-eliminating toothed ring.

2. The backlash-free gear assembly according to claim 1, characterized in that: The inclined groove has a first opening on the side near the backlash-eliminating gear and a second opening on the side away from the backlash-eliminating gear. When the inclined groove is projected along the axial direction of the shaft, in the circumferential direction of the shaft, the first opening is close to the tooth surfaces of the first gear and the second gear in the same meshing tooth groove, and the second opening is close to the tooth surfaces of the backlash-eliminating gear and the second gear in the same meshing tooth groove. The extension direction of the inclined guide rail is parallel to the extension direction of the inclined groove.

3. The backlash-free gear assembly according to claim 1, characterized in that: The locking unit further includes a second rotary slider, which is sleeved onto the shaft body and located on the side of the first rotary slider away from the straight slider. The second rotary slider is threadedly connected to the shaft body, and there is a gap between the second rotary slider and the first rotary slider.

4. The backlash-free gear assembly according to claim 3, characterized in that: The locking unit also includes several screws and several nuts. The first rotary slider has several screw holes, and the second rotary slider has several light holes corresponding to the screw holes. Each screw is installed on the screw hole by passing through each light hole, and the nuts are tightened to press the first rotary slider and the second rotary slider together.

5. The backlash-free gear assembly according to claim 4, characterized in that: A threaded groove is provided on the side of the shaft away from the first gear for threaded connection with the first rotary slider. A straight groove is provided on the threaded groove, extending axially along the shaft. The length of the straight groove is greater than or equal to the length of the threaded groove. An opening is provided in the middle of the straight slider, and a straight guide rail is provided on its inner sidewall, extending axially along the shaft. The straight guide rail is engaged in the straight groove.

6. The backlash-free gear assembly according to claim 5, characterized in that: The backlash elimination unit also includes a connecting plate, which is fixed on the end face of the backlash elimination gear ring facing the backlash elimination gear. One side of the connecting plate opposite to the backlash elimination gear has a protruding boss, and the other side has a recessed portion. The boss is inserted into the recessed portion.

7. The backlash-free gear assembly according to claim 6, characterized in that: The connecting plate is fixedly connected to the backlash-eliminating gear by screws.

8. The backlash-free gear assembly according to claim 7, characterized in that: The end of the shaft away from the backlash elimination unit is provided with a protrusion surrounding the outside of the shaft, and the first gear abuts against the protrusion.

9. The backlash-free gear assembly according to claim 8, characterized in that: A flat key protrudes from the outer circumferential surface of the shaft, and a through hole is provided in the middle of the first gear. A groove is provided on its inner sidewall, and the flat key is engaged in the groove.

10. The backlash-free gear assembly according to claim 9, characterized in that: The recesses on the backlash-free gear and the bosses on the connecting plate are evenly distributed and correspond one-to-one along the circumference of the shaft, and / or the inclined guide rail and the inclined groove are evenly distributed and correspond one-to-one along the circumference of the shaft, and / or the screw holes on the first rotary slider and the light holes on the second rotary slider are evenly distributed and correspond one-to-one along the circumference of the shaft.

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