Motor transmission structure

Abstract

The utility model discloses a motor transmission structure. The motor transmission structure comprises a motor body; the bracket is fixedly arranged on the outer wall of the motor body; the screw rod is connected to the output end of the motor body and penetrates through the bracket; the sliding part is in threaded connection with the lead screw, the sliding part penetrates through a movable space for the lead screw to penetrate through, and an opening is formed in one side of the movable space so that threads in the movable space can form a non-coherent opening shape; the limiting piece limits separation of the sliding piece and the lead screw; and the force application piece applies elastic pre-compression force to the screw rod. The transmission clearance adjusting device has the advantages that the transmission clearance is automatically adjusted through the force applying piece, and the situation that the back clearance of a terminal product is poor due to the transmission clearance is reduced.

Description

Technical Field

[0001] The utility model relates to the field of motor transmission structures, in particular to a motor transmission structure. Background Art

[0002] Currently, existing motor transmission systems primarily utilize a screw and slider in combination to achieve power transmission. However, this transmission method presents some significant issues. For one thing, excessive clearance may occur between the screw and slider. This is primarily due to wear from long-term use, insufficient machining precision, or accumulated errors during installation. Excessive clearance can lead to significant backlash during transmission, significantly reducing transmission accuracy and causing inaccurate operation of the terminal device. Alternatively, the clearance can be too small, increasing friction between components, accelerating wear and tear and potentially causing stalling during transmission. These issues directly impact end-user experience. In applications requiring high precision, such as precision instrument processing and positioning systems in automated production lines, this transmission clearance issue can lead to poor backlash in the end product, severely impacting product performance and quality and reducing end-customer satisfaction. Utility Model Content

[0003] In order to reduce the possibility of hidden dangers caused by the gap problem between the lead screw and the slider of the motor during the transmission process, the utility model provides a motor transmission structure.

[0004] The utility model provides a technical solution that adopts the following:

[0005] A motor transmission structure, comprising:

[0006] Motor body;

[0007] A bracket, fixed to the outer wall of the motor body;

[0008] A screw rod is connected to the output end of the motor body and passes through the bracket;

[0009] A sliding member is threadedly connected to the screw rod, and the sliding member has a movable space for the screw rod to pass through, and one side of the movable space is open so that the threads in the movable space form a discontinuous opening shape;

[0010] A limiting member, which limits the sliding member from separating from the lead screw;

[0011] A force applying member applies elastic preload to the screw rod.

[0012] An open movable space is set for the sliding part, and then the sliding part is threadedly connected to the outer periphery of the screw rod. When the gap is large, the force-applying part applies pressure to the screw rod to press the screw rod against the meshing thread, so that there is no obvious idle stroke during the transmission process, and the shaking of the screw rod due to the gap is reduced; when the gap is too small, the screw rod itself pushes away the force-applying part, and the force-applying part has a certain deformation space. The screw rod and the sliding part can automatically adjust the gap suitable for transmission through mutual meshing. The transmission gap is automatically adjusted by the force-applying part, which is conducive to reducing the problem of transmission gap that causes poor backlash in the terminal product.

[0013] Preferably, the sliding part includes an upper threaded portion, a lower threaded portion and a connecting portion, and the upper threaded portion and the lower threaded portion are arranged on both sides of the connecting portion opposite each other, and the threads of the upper threaded portion and the lower threaded portion are both embedded in the threads of the screw rod, and the opening side of the movable space is located on the side of the lower threaded portion away from the connecting portion.

[0014] Compared with the traditional annular thread, the proportion of the threaded connection area of ​​the sliding part is reduced, and when the diameter of the screw rod changes to a certain extent, the upper threaded part is pressed down, so that the upper threaded part is closer to the lower threaded part. The housing makes both the upper threaded part and the lower threaded part fit with the peripheral wall thread of the screw rod. The annular thread can adapt to a smaller range of screw rod diameters. The setting of the sliding part can improve the adaptability of the sliding part.

[0015] Preferably, two groups of screw threads are provided in the sliding member, and the two groups of screw threads each include two lower screw threads provided in the lower threaded portion and one upper screw thread provided in the upper threaded portion, and the upper screw thread is opposite to the thread gap between the two lower screw threads in the same group, and the two groups of screw threads are respectively provided at both ends of the sliding member along the length direction of the screw rod.

[0016] As the slider slides along the lead screw, the upper and lower threads engage with the lead screw's threads. The two lower threads within the same set of threads provide secure support for the lead screw, preventing the lead screw from unbalanced support from the lower threads and causing wobble. The two sets of threads enhance the stability of the lead screw's support, making it less susceptible to wobble when the slider slides on the lead screw.

[0017] Preferably, the force applying member includes a pre-pressing tooth connected to the connecting portion, the pre-pressing tooth is connected to the side wall of the connecting portion through a metal plate, the pre-pressing tooth is arranged between the two upper screw threads, and the distance from the top of the pre-pressing tooth to the top of the lower screw thread is smaller than the distance from the top of the upper screw thread to the top of the lower screw thread;

[0018] The upper threaded portion includes two support plates, which correspondingly support two upper threads. The two support plates and the metal plate are independently arranged, and the thickness of the metal plate is smaller than that of the support plate.

[0019] The metal plate is set to a relatively thin thickness. When the pre-stressing teeth under the metal plate are subjected to thrust, there is a certain deformation space at the connection between the metal plate and the connecting part. When the pre-stressing teeth are subjected to thrust by the screw rod, the pre-stressing teeth are deformed toward the connecting part, thereby adjusting the gap between the screw rod and the screw thread; when the screw rod is removed, the thrust exerted on the pre-stressing teeth disappears, the metal plate recovers its deformation and drives the pre-stressing teeth to reset.

[0020] Preferably, a material reduction groove is provided at the top end of the connecting portion, and the material reduction groove is located at the connection between the connecting portion and the support plate.

[0021] The setting of the material reduction groove reduces the connection area between the connecting part and the support plate. When the diameter of the screw rod is large, the support plate is squeezed by the screw rod. The setting of the material reduction groove makes the connection between the connecting part and the support plate less likely to break.

[0022] Preferably, the support plate is parallel to the lower threaded portion, and a connecting plate is integrally connected between the support plate and the connecting portion, and the connecting plate is inclined to transition between the support plate and the connecting portion.

[0023] The connecting plate increases the angle between the supporting plate and the connecting portion. When the supporting plate is subjected to force, the connection between the supporting plate and the connecting portion is less likely to break, which is beneficial to protecting the connection between the supporting plate and the connecting portion.

[0024] Preferably, the limiting member includes a guide hole and a guide rod, the guide rod is fixed to the bracket, the guide rod is parallel to the screw rod, the guide hole passes through the sliding member, the guide hole is set to avoid the activity space, and the guide rod is adapted to slide in the guide hole.

[0025] When the sliding part moves along the screw, the guide hole slides along the guide rod. Since the guide rod is fixed, the guide hole and the guide rod cooperate to limit the circumferential rotation of the sliding part around the screw. While limiting the separation of the sliding part from the screw, the guide hole and the guide rod can also limit the rotation of the sliding part around the screw, and can also improve the stability of the sliding part moving along the screw.

[0026] In summary, the present invention has the following beneficial technical effects:

[0027] An open movable space is set for the sliding part, and then the sliding part is threadedly connected to the outer periphery of the screw rod. When the gap is large, the force-applying part applies pressure to the screw rod to press the screw rod against the meshing thread, so that there is no obvious idle stroke during the transmission process, and the shaking of the screw rod due to the gap is reduced; when the gap is too small, the screw rod itself pushes away the force-applying part, and the force-applying part has a certain deformation space. The screw rod and the sliding part can automatically adjust the gap suitable for transmission through mutual meshing. The transmission gap is automatically adjusted by the force-applying part, which is conducive to reducing the problem of transmission gap that causes poor backlash in the terminal product. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of a motor transmission structure of the present utility model.

[0029] Figure 2 It is a structural diagram used to illustrate the material reduction chute.

[0030] Explanation of the accompanying reference numerals: 1. Motor body; 2. Bracket; 3. Screw; 4. Sliding part; 5. Upper threaded portion; 51. Upper thread; 52. Support plate; 6. Lower threaded portion; 61. Lower thread; 7. Connecting portion; 71. Material reduction groove; 72. Connecting plate; 8. Pre-pressing thread; 9. Guide hole; 10. Guide rod. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-2 The utility model is described in further detail.

[0032] The embodiment of the utility model discloses a motor transmission structure.

[0033] Reference Figure 1 as well as Figure 2 , a motor transmission structure, comprising:

[0034] Motor body 1;

[0035] The bracket 2 is fixed to the outer wall of the motor body 1;

[0036] The screw rod 3 is connected to the output end of the motor body 1 and passes through the bracket 2;

[0037] The sliding member 4 is threadedly connected to the screw rod 3. The sliding member 4 has a movable space for the screw rod 3 to pass through. One side of the movable space is open so that the threads in the movable space form a discontinuous opening.

[0038] A limiting member, which limits the sliding member 4 from separating from the screw rod 3;

[0039] The force applying member applies elastic preload to the screw rod 3 .

[0040] An open movable space is set for the sliding member 4, and then the sliding member 4 is threadedly connected to the outer periphery of the screw rod 3. When the gap is large, the force-applying member applies pressure to the screw rod 3 to press the screw rod 3 tightly against the meshing thread, so that there will be no obvious idle stroke during the transmission process, reducing the shaking of the screw rod 3 due to the gap; when the gap is too small, the screw rod 3 itself pushes away the force-applying member, and the force-applying member has a certain deformation space. The screw rod 3 and the sliding member 4 can automatically adjust the gap suitable for transmission through mutual meshing. The transmission gap is automatically adjusted by the force-applying member, which is beneficial to reducing the problem of transmission gap that causes poor backlash in the terminal product.

[0041] Reference Figure 1 as well as Figure 2 In this embodiment, the sliding member 4 includes an upper threaded portion 5, a lower threaded portion 6 and a connecting portion 7. The upper threaded portion 5 and the lower threaded portion 6 are arranged on both sides of the connecting portion 7. The threads of the upper threaded portion 5 and the lower threaded portion 6 are both embedded in the threads of the screw rod 3, and the opening side of the movable space is located on the side of the lower threaded portion 6 away from the connecting portion 7.

[0042] Compared with the traditional annular thread, the proportion of the threaded connection area of ​​the sliding member 4 is reduced, and when the diameter of the screw rod 3 changes to a certain extent, the upper threaded portion 5 is pressed down, so that the upper threaded portion 5 is closer to the lower threaded portion 6. The housing makes the upper threaded portion 5 and the lower threaded portion 6 fit with the circumferential wall thread of the screw rod 3. The annular thread can adapt to a smaller range of screw rod 3 diameters. The setting of the sliding member 4 can improve the adaptability of the sliding member 4.

[0043] Reference Figure 1 as well as Figure 2 In this embodiment, two groups of screw threads are provided in the sliding member 4. Both groups of screw threads include two lower screw threads 61 provided on the lower threaded portion 6 and one upper screw thread 51 provided on the upper threaded portion 5. The upper screw thread 51 is opposite to the thread gap between the two lower screw threads 61 of the same group. The two groups of screw threads are respectively provided at both ends of the sliding member 4 along the length direction of the screw rod 3.

[0044] When the slider 4 slides along the screw rod 3, the upper and lower threads 51 and 61 respectively engage with the threads of the screw rod 3. The two lower threads 61 provided within the same set of threads firmly support the screw rod 3 and prevent the screw rod 3 from shaking due to the unbalanced support provided by the lower threads 61. The provision of two sets of threads improves the stability of the support provided by the lower threads 61 on the screw rod 3, making it less likely for the slider 4 to shake when sliding on the screw rod 3.

[0045] Reference Figure 1 as well as Figure 2 In this embodiment, the force applying member includes a pre-pressing tooth 8 connected to the connecting portion 7. The pre-pressing tooth 8 is connected to the side wall of the connecting portion 7 through a metal plate. The pre-pressing tooth 8 is arranged between the two upper screw threads 51. The distance from the top of the pre-pressing tooth 8 to the top of the lower screw thread 61 is smaller than the distance from the top of the upper screw thread 51 to the top of the lower screw thread 61.

[0046] The upper threaded portion 5 includes two support plates 52 , which support the two upper threads 51 respectively. The two support plates 52 and the metal plate are independently provided, and the thickness of the metal plate is smaller than that of the support plates 52 .

[0047] The metal plate is set to a relatively thin thickness. When the pre-pressing teeth 8 under the metal plate are subjected to thrust, there is a certain deformation space at the connection between the metal plate and the connecting part 7. When the pre-pressing teeth 8 are subjected to thrust by the screw rod 3, the pre-pressing teeth 8 are deformed toward the connecting part 7, thereby adjusting the gap between the screw rod 3 and the screw thread; when the screw rod 3 is removed, the thrust applied to the pre-pressing teeth 8 disappears, the metal plate recovers its deformation and drives the pre-pressing teeth 8 to reset.

[0048] Reference Figure 1 as well as Figure 2 In this embodiment, a material reduction groove 71 is provided at the top of the connecting portion 7 , and the material reduction groove 71 is located at the connection between the connecting portion 7 and the support plate 52 .

[0049] The setting of the material reduction groove 71 reduces the connection area between the connecting part 7 and the support plate 52. When the diameter of the screw rod 3 is large, the support plate 52 is squeezed by the screw rod 3. The setting of the material reduction groove 71 makes the connection between the connecting part 7 and the support plate 52 less likely to break.

[0050] Reference Figure 1 as well as Figure 2 In this embodiment, the support plate 52 is parallel to the lower threaded portion 6 , and a connecting plate 72 is integrally connected between the support plate 52 and the connecting portion 7 , and the connecting plate 72 is inclined to transition the support plate 52 and the connecting portion 7 .

[0051] The connecting plate 72 increases the angle between the support plate 52 and the connecting portion 7 . When the support plate 52 is subjected to force, the connection between the support plate 52 and the connecting portion 7 is less likely to break, which is beneficial to protecting the connection between the support plate 52 and the connecting portion 7 .

[0052] Reference Figure 1 as well as Figure 2 In this embodiment, the limiting member includes a guide hole 9 and a guide rod 10. The guide rod 10 is fixed to the bracket 2. The guide rod 10 is parallel to the screw rod 3. The guide hole 9 passes through the sliding member 4. The guide hole 9 is set to avoid the activity space, and the guide rod 10 is adapted to slide in the guide hole 9.

[0053] When the sliding member 4 moves along the screw rod 3, the guide hole 9 slides along the guide rod 10. Since the guide rod 10 is fixed, the guide hole 9 and the guide rod 10 cooperate to limit the circumferential rotation of the sliding member 4 around the screw rod 3. While limiting the separation of the sliding member 4 from the screw rod 3, the guide hole 9 and the guide rod 10 can also limit the rotation of the sliding member 4 around the screw rod 3, and can also improve the stability of the sliding member 4 moving along the screw rod 3.

[0054] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A motor transmission structure, characterized in that: include Motor body; A bracket, fixed to the outer wall of the motor body; A screw rod is connected to the output end of the motor body and passes through the bracket; A sliding member is threadedly connected to the screw rod, and the sliding member has a movable space for the screw rod to pass through, and one side of the movable space is open so that the threads in the movable space form a discontinuous opening shape; A limiting member, which limits the sliding member from separating from the lead screw; A force applying member applies elastic preload to the screw rod.

2. The motor transmission structure according to claim 1, wherein: The sliding part includes an upper threaded portion, a lower threaded portion and a connecting portion. The upper threaded portion and the lower threaded portion are arranged on both sides of the connecting portion. The threads of the upper threaded portion and the lower threaded portion are both embedded in the threads of the screw rod. The opening side of the movable space is located on the side of the lower threaded portion away from the connecting portion.

3. The motor transmission structure according to claim 2, wherein: Two groups of screw threads are provided in the sliding member, and both groups of screw threads include two lower screw threads provided in the lower threaded portion and one upper screw thread provided in the upper threaded portion. The upper screw thread is opposite to the thread gap between the two lower screw threads in the same group. The two groups of screw threads are respectively provided at both ends of the sliding member along the length direction of the screw rod.

4. The motor transmission structure according to claim 3, wherein: The force applying member includes a pre-pressing tooth connected to the connecting portion, the pre-pressing tooth is connected to the side wall of the connecting portion through a metal plate, the pre-pressing tooth is arranged between the two upper screw threads, and the distance from the top of the pre-pressing tooth to the top of the lower screw thread is smaller than the distance from the top of the upper screw thread to the top of the lower screw thread; The upper threaded portion includes two support plates, which correspondingly support two upper threads. The two support plates and the metal plate are independently arranged, and the thickness of the metal plate is smaller than that of the support plate.

5. The motor transmission structure according to claim 4, characterized in that: A material reduction groove is provided at the top end of the connecting portion, and the material reduction groove is located at the connection between the connecting portion and the support plate.

6. The motor transmission structure according to claim 5, characterized in that: The support plate is parallel to the lower threaded portion. A connecting plate is integrally connected between the support plate and the connecting portion. The connecting plate is inclined to transition between the support plate and the connecting portion.

7. The motor transmission structure according to claim 6, characterized in that: The limiting member includes a guide hole and a guide rod, the guide rod is fixed to the bracket, the guide rod is parallel to the screw rod, the guide hole passes through the sliding member, the guide hole is set to avoid the activity space, and the guide rod is adapted to slide in the guide hole.

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