Anti-backlash structure and transmission device

Abstract

The utility model relates to the technical field of mechanical transmission, and provides an anti-backlash structure and a transmission device.A first mounting groove and a second mounting groove are formed in one side wall of a support in the first direction, and the second mounting groove is formed in the bottom wall of the first mounting groove; the bearing is mounted in the second mounting groove, and the axis of the bearing is parallel to the first direction; the end face of the first protruding part of the fixing plug is provided with a plurality of protruding points capable of generating plastic deformation around the axis of the bearing, the fixing plug is connected with the support in an inserted mode and fixed in the first direction, and the attaching face is attached to the bottom wall of the first installation groove and fixed through laser welding. The plastic deformation of the protruding points fills the gap between the first protruding part and the axial end face of the outer ring of the bearing, and the machining difficulty of the fixing plug can be reduced, so that when the first protruding part abuts against the outer ring of the bearing, the attaching face can be attached to the bottom wall of the first installation groove, and welding is completed. And when the bearing is subjected to an axial acting force, axial movement is not easy to occur.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to a backlash elimination structure and a transmission device. Background Art

[0002] The transmission device using the lead screw-slider model generally includes a bracket, a lead screw, a guide rod and a slider. The lead screw and the guide rod are arranged in parallel, the lead screw and the bracket are rotatably arranged, the guide rod is inserted into the bracket, one end of the slider is slidably connected to the guide rod, and the other end is threadedly connected to the lead screw. When the axis of the lead screw rotates, the slider moves along the axial direction of the lead screw. In order to reduce the friction between the lead screw and the bracket, one axial end of the lead screw is connected to the drive assembly in a transmission manner, and the other end is rotatably connected to the bracket through a bearing.

[0003] When the slider moves with a large load, the bearing is subjected to axial force. Affected by the processing accuracy, there is always an axial gap between the bearing and the bracket. The bearing is prone to relative movement with the bracket along its axial direction, and the bearing and the bracket collide, making a "clicking" sound, forming operating noise.

[0004] Therefore, there is an urgent need for a backlash-eliminating structure and a transmission device to solve the above-mentioned technical problems. Utility Model Content

[0005] The utility model aims to provide a backlash elimination structure and a transmission device, which can prevent the axial movement of the bearing and reduce the processing accuracy of the fixing plug.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Anti-backlash structure, including:

[0008] A bracket, wherein a first mounting groove and a second mounting groove are formed on a side wall of the bracket along a first direction, and the second mounting groove is formed on a bottom wall of the first mounting groove;

[0009] A bearing, the bearing is installed in the second installation groove, and the axis of the bearing is parallel to the first direction;

[0010] A fixing plug, the fixing plug includes a fitting surface and a first raised portion, the end surface of the first raised portion is provided with a plurality of protrusions around the axis of the bearing, the fixing plug is plugged into and fixed to the bracket along the first direction, the protrusions abut against the outer ring of the bearing and the protrusions can undergo plastic deformation, the fitting surface fits against the bottom wall of the first mounting groove and is fixed by laser welding.

[0011] As a preferred technical solution of the above-mentioned anti-backlash structure, the above-mentioned first protrusion is in a circular ring shape, and the projection of the above-mentioned first protrusion along the above-mentioned first direction coincides with the projection of the outer ring of the above-mentioned bearing and is spaced apart from the projection of the inner ring of the above-mentioned bearing.

[0012] As a preferred technical solution of the above-mentioned anti-backlash structure, the contact surface between the above-mentioned protrusion and the outer ring of the above-mentioned bearing is spherical.

[0013] As a preferred technical solution of the above-mentioned anti-backlash structure, the above-mentioned fixing plug and the above-mentioned bracket are both made of plastic.

[0014] A transmission device is also provided, comprising a lead screw, a guide rod, a slider and the above-mentioned anti-backlash structure, wherein the axis of the lead screw and the axis of the guide rod are both arranged parallel to the above-mentioned first direction, the slider is threadedly connected to the lead screw and slidably connected to the above-mentioned guide rod, one axial end of the lead screw is fixedly inserted in the inner ring of the above-mentioned bearing, and the other end is rotatably arranged in the above-mentioned bracket, and the axial ends of the above-mentioned guide rod are respectively inserted in the above-mentioned bracket.

[0015] As a preferred technical solution for the transmission device, the bracket is provided with a first mounting hole and a second mounting hole on opposite sides of the first direction, respectively. The first mounting hole is a blind hole, and the second mounting hole is a through hole. The axial ends of the guide rod are respectively inserted into the first mounting hole and the second mounting hole. The fixing plug also includes a second protrusion, which is fixed to the fitting surface. The second protrusion can be inserted into the second mounting hole, and the guide rod is clamped between the second protrusion and the bottom wall of the first mounting hole along the first direction.

[0016] As a preferred technical solution for the above-mentioned transmission device, the above-mentioned slider includes a block body and a fixed plate, the above-mentioned block body is provided with a light hole and a U-shaped groove, the above-mentioned light hole is used to pass the above-mentioned guide rod, the above-mentioned lead screw is placed in the above-mentioned U-shaped groove, the above-mentioned fixed plate is connected to the above-mentioned block body through fasteners, the above-mentioned fixed plate can close the opening of the above-mentioned U-shaped groove in its depth direction, and the above-mentioned lead screw is threadedly connected to the above-mentioned fixed plate.

[0017] As a preferred technical solution of the transmission device, a limiting member is fixed to one axial end of the screw, and after the screw portion is inserted into the inner ring of the bearing, the limiting member abuts against the axial end face of the inner ring along the first direction.

[0018] As a preferred technical solution of the above-mentioned transmission device, it also includes a driving member, the above-mentioned driving member is installed on the above-mentioned bracket, and the output end of the above-mentioned driving member is transmission-connected with the other end of the above-mentioned lead screw.

[0019] As a preferred technical solution of the transmission device, the drive member is transmitted to the lead screw via a transmission assembly.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a clearance elimination structure, including a bracket, a bearing and a fixing plug. The bracket is provided with a first mounting groove and a second mounting groove along a first direction on one side wall thereof, and the second mounting groove is formed on the bottom wall of the first mounting groove; the bearing is installed in the second mounting groove, and the axis of the bearing is parallel to the first direction; the fixing plug includes a fitting surface and a first protruding portion, and the end surface of the first protruding portion is provided with a plurality of convex points around the axis of the bearing, the fixing plug is plugged and fixed with the bracket along the first direction, the convex points are in contact with the outer ring of the bearing and the convex points can undergo plastic deformation, and the fitting surface is in contact with the bottom wall of the first mounting groove and fixed by laser welding. The first raised portion abuts against the axial end face of the outer ring of the bearing through the convex point, clamping the bearing between the bottom wall of the second mounting groove and the first raised portion, preventing the bearing from moving along the first direction when subjected to axial force. The plastic deformation of the convex point fills the gap between the first raised portion and the axial end face of the outer ring of the bearing, and can reduce the processing difficulty of the fixing plug, so that when the first raised portion abuts against the outer ring of the bearing, the fitting surface can also be fitted with the bottom wall of the first mounting groove to complete the welding.

[0022] A transmission device is also provided, comprising a lead screw, a guide rod, a slider and the above-mentioned clearance elimination structure, wherein the axis of the lead screw and the axis of the guide rod are both arranged parallel to the first direction, the slider is threadedly connected to the lead screw and slidably connected to the guide rod, one axial end of the lead screw is fixedly inserted in the inner ring of the bearing, and the other end is rotatably arranged in the bracket, and the axial ends of the guide rod are respectively inserted in the bracket. When the lead screw rotates, it can drive the slider to move along the first direction, and the slider is used to connect the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0024] Figure 1 It is a structural schematic diagram of a transmission device provided by an embodiment of the utility model;

[0025] Figure 2 is a top view of the transmission device provided by an embodiment of the utility model;

[0026] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0027] Figure 4 It is a schematic diagram of the structure of the bracket provided by the embodiment of the utility model;

[0028] Figure 5 It is a schematic diagram of the structure of the fixing plug provided by the embodiment of the utility model;

[0029] Figure 6 It is a structural schematic diagram of a slider provided in an embodiment of the utility model;

[0030] Figure 7 It is a schematic diagram of the structure of the transmission device (excluding the bracket) provided in the embodiment of the utility model;

[0031] Figure 8 It is a structural schematic diagram of a transmission assembly provided in an embodiment of the utility model.

[0032] In the figure:

[0033] X, first direction;

[0034] 10. Bracket; 11. First mounting slot; 12. Second mounting slot; 13. First mounting hole; 14. Second mounting hole;

[0035] 20. Bearings;

[0036] 30. fixing plug; 31. fitting surface; 32. first raised portion; 321. raised point; 33. second raised portion;

[0037] 40. Lead screw; 41. Limiting member;

[0038] 50. Guide rod; 60. Sliding block; 61. Block body; 611. Light hole; 612. U-shaped groove; 62. Fixed plate; 70. Transmission assembly; 71. Ring gear; 72. Planetary gear; 73. Planetary carrier. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] like Figures 1 to 8 As shown, the utility model provides a clearance elimination structure, including a bracket 10, a bearing 20 and a fixing plug 30. The bracket 10 is provided with a first mounting groove 11 and a second mounting groove 12 along a first direction X on one side wall thereof, and the second mounting groove 12 is formed on the bottom wall of the first mounting groove 11; the bearing 20 is installed in the second mounting groove 12, and the axis of the bearing 20 is parallel to the first direction X; the fixing plug 30 includes a fitting surface 31 and a first protruding portion 32, and the end surface of the first protruding portion 32 is provided with a plurality of convex points 321 around the axis of the bearing 20, the fixing plug 30 is plugged and fixed with the bracket 10 along the first direction X, the convex points 321 are in contact with the outer ring of the bearing 20 and the convex points 321 can undergo plastic deformation, and the fitting surface 31 is in contact with the bottom wall of the first mounting groove 11 and fixed by laser welding.

[0044] Specifically, during the assembly process, the bearing 20 is first installed in the second installation groove 12, and then the fixing plug 30 is inserted into the bracket 10 along the first direction X. The protrusion 321 preferentially abuts against the outer ring of the bearing 20 along the first direction X. Further, the fixing plug 30 is pushed along the first direction X, so that the protrusion 321 undergoes plastic deformation until the fitting surface 31 fits with the bottom wall of the first installation groove 11, and then welding is performed to complete the relative fixation of the fixing plug 30 and the bracket 10.

[0045] In this way, the first raised portion 32 abuts against the axial end face of the outer ring of the bearing 20 through the protrusion 321, clamping the bearing 20 between the bottom wall of the second mounting groove 12 and the first raised portion 32, preventing the bearing 20 from moving along the first direction X when subjected to axial force. The plastic deformation of the protrusion 321 not only fills the gap between the first raised portion 32 and the axial end face of the outer ring of the bearing 20, but also reduces the processing difficulty of the fixing plug 30, so that when the first raised portion 32 abuts against the outer ring of the bearing 20, the fitting surface 31 can also fit with the bottom wall of the first mounting groove 11 to complete the welding.

[0046] Furthermore, the fixing plug 30 and the bracket 10 are both made of plastic, and the laser can penetrate the fitting surface 31 of the fixing plug 30 and melt the fitting surface 31 and the bottom wall of the first installation groove 11 into one piece.

[0047] It should be noted that the laser welding process is an existing technology, and its specific operation process and working principle will not be repeated here.

[0048] Optionally, the first raised portion 32 is annular, and along the projection in the first direction X, the projection of the first raised portion 32 coincides with the projection of the outer ring of the bearing 20 and is spaced apart from the projection of the inner ring of the bearing 20. In this way, the first raised portion 32 of the fixing plug 30 abuts against the outer ring of the bearing 20 along the first direction X through the convex point 321, and does not contact the inner ring of the bearing 20, thereby avoiding affecting the relative rotation of the inner ring and the outer ring of the bearing 20.

[0049] Optionally, the contact surface between the protrusion 321 and the outer ring of the bearing 20 is spherical. When the fixing plug 30 is inserted into the bracket 10 along the first direction X, the spherical surface of the protrusion 321 abuts against the axial end surface of the outer ring of the bearing 20. The spherical surface can reduce stress concentration and is more easily deformed than the columnar protrusion.

[0050] Optionally, the fixing plug 30 and the bracket 10 are both made of plastic.

[0051] A transmission device is also provided, comprising a lead screw 40, a guide rod 50, a slider 60 and a backlash elimination structure, wherein the axis of the lead screw 40 and the axis of the guide rod 50 are both arranged parallel to the first direction X, the slider 60 is threadedly connected to the lead screw 40 and slidably connected to the guide rod 50, one axial end of the lead screw 40 is fixedly inserted in the inner ring of the bearing 20, and the other end is rotatably arranged in the bracket 10, and the axial ends of the guide rod 50 are respectively inserted in the bracket 10. In this way, when the lead screw 40 is driven to rotate around its axis, the slider 60 cannot rotate with the lead screw 40 around the axial direction of the lead screw 40 due to the limitation of the guide rod 50, and can only reciprocate along the first direction X.

[0052] Specifically, the lead screw 40 and the inner ring of the bearing 20 are fitted in a fixed manner to limit relative rotation between the lead screw 40 and the inner ring of the bearing 20 through interference fit, spline fit or other methods.

[0053] Optionally, the bracket 10 is provided with a first mounting hole 13 and a second mounting hole 14 on opposite sides of the first direction X, respectively. The first mounting hole 13 is a blind hole, and the second mounting hole 14 is a through hole. The axial ends of the guide rod 50 are respectively inserted into the first mounting hole 13 and the second mounting hole 14. The fixing plug 30 also includes a second protrusion 33, which is fixed to the fitting surface 31. The second protrusion 33 can be inserted into the second mounting hole 14, and the guide rod 50 is clamped between the second protrusion 33 and the bottom wall of the first mounting hole 13 along the first direction X. Specifically, in the first direction X, the second mounting hole 14 and the first mounting groove 11 are located on the same side of the bracket 10, and the first mounting hole 13 is located on the other side of the bracket 10. During assembly, one end of the guide rod 50 passes through the second mounting hole 14 and abuts against the bottom surface of the first mounting hole 13, and the other end is inserted into the second mounting hole 14. In order to prevent the guide rod 50 from moving along the first direction X, the fixing plug 30 also includes a second protrusion 33, and the second protrusion 33 is inserted into the second mounting hole 14 and abuts against the other end of the guide rod 50 along the first direction X. In this way, the guide rod 50 is limited in the first direction X between the bottom wall of the first mounting hole 13 and the second protrusion 33.

[0054] After long-term use, or when the slider 60 is connected to a load of excessive mass, the threaded transmission between the slider 60 and the lead screw 40 is prone to tooth disengagement, and the reason is that the thread of the slider 60 is worn. It is impossible to maintain tight engagement with the thread of the lead screw 40. To this end, in this embodiment, the slider 60 includes a block body 61 and a fixed plate 62, the block body 61 is provided with a light hole 611 and a U-shaped groove 612, the light hole 611 is used to penetrate the guide rod 50, the lead screw 40 is placed in the U-shaped groove 612, the fixed plate 62 is connected to the block body 61 by fasteners, the fixed plate 62 can close the opening of the U-shaped groove 612 in its depth direction, and the lead screw 40 is threadedly connected to the fixed plate 62. In this way, only the fixed plate 62 needs to be replaced, and the block body 61 is kept still sleeved outside the guide rod 50.

[0055] Specifically, the fixing plate 62 is connected to the block body 61 via threaded fasteners.

[0056] Optionally, a limiting member 41 is fixed to one axial end of the lead screw 40, and after the lead screw 40 is partially inserted into the inner ring of the bearing 20, the limiting member 41 abuts against the axial end surface of the inner ring along the first direction X. In this way, the limiting member 41 can limit the relative movement of the lead screw 40 and the bearing 20 along the first direction X.

[0057] Optionally, the lead screw 40 and the limiting member 41 are integrally formed.

[0058] Optionally, the transmission device further includes a driving member, which is mounted on the bracket 10, and the output end of the driving member is transmission-connected to the other end of the lead screw 40. In this way, the rotation automation of the lead screw 40 is realized by the driving member, and the slider 60 is driven to reciprocate in the first direction X by adjusting the forward and reverse rotation of the driving member, and the moving speed of the slider 60 is changed by adjusting the output speed of the driving member.

[0059] Optionally, the driving member is driven by the transmission assembly 70 and the lead screw 40 .

[0060] Specifically, the transmission assembly 70 includes a ring gear 71, a sun gear, a planet carrier 73 and a plurality of planetary gears 72. The ring gear 71 is fixed to the bracket 10; the sun gear is fixed to the output end of the driving member and is coaxially arranged with the ring gear 71; the planetary gears 72 are distributed around the axis of the sun gear and mesh with the sun gear and the ring gear 71 respectively; the planetary carrier 73 is rotationally connected to the bracket 10, one end of the planetary carrier 73 is rotationally connected to the planetary gear 72, and the other end is transmission-connected to the lead screw 40. With such an arrangement, when the driving member drives the sun gear to rotate around its axis, the planetary gear 72 not only rotates around the axis of the sun gear, but also rotates around its own axis, thereby driving the planetary carrier 73 to rotate around the axial direction of the sun gear, thereby achieving a transmission effect of reducing speed and increasing distance.

[0061] In other embodiments, the transmission assembly 70 may also adopt other transmission methods such as parallel gear transmission.

[0062] Specifically, the other end of the planet carrier 73 and the lead screw 40 are fixed by splines.

[0063] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. Anti-gap structure, characterized in that: include: A bracket (10), wherein a first mounting groove (11) and a second mounting groove (12) are formed on one side wall of the bracket (10) along a first direction (X), and the second mounting groove (12) is formed on a bottom wall of the first mounting groove (11); a bearing (20), the bearing (20) being installed in the second installation groove (12), and the axis of the bearing (20) being parallel to the first direction (X); A fixing plug (30), the fixing plug (30) comprising a fitting surface (31) and a first raised portion (32), the end surface of the first raised portion (32) being provided with a plurality of protrusions (321) around the axis of the bearing (20), the fixing plug (30) being plugged into and fixed to the bracket (10) along the first direction (X), the protrusions (321) being in contact with the outer ring of the bearing (20) and being capable of plastic deformation, the fitting surface (31) being in contact with the bottom wall of the first mounting groove (11) and being fixed by laser welding.

2. The anti-backlash structure according to claim 1, characterized in that: The first protrusion (32) is annular in shape, and along the projection of the first direction (X), the projection of the first protrusion (32) coincides with the projection of the outer ring of the bearing (20) and is spaced apart from the projection of the inner ring of the bearing (20).

3. The anti-backlash structure according to claim 1, characterized in that: The contact surface between the protrusion (321) and the outer ring of the bearing (20) is spherical.

4. The anti-backlash structure according to claim 1, characterized in that: The fixing plug (30) and the bracket (10) are both made of plastic.

5. A transmission device, characterized in that: It comprises a lead screw (40), a guide rod (50), a slider (60) and the backlash elimination structure according to any one of claims 1 to 4, wherein the axis of the lead screw (40) and the axis of the guide rod (50) are both arranged parallel to the first direction (X), the slider (60) is threadedly connected to the lead screw (40) and slidably connected to the guide rod (50), one axial end of the lead screw (40) is fixedly inserted in the inner ring of the bearing (20), and the other end is rotatably arranged in the bracket (10), and the axial ends of the guide rod (50) are respectively inserted in the bracket (10).

6. The transmission device according to claim 5, characterized in that: The bracket (10) is provided with a first mounting hole (13) and a second mounting hole (14) on opposite sides in the first direction (X), respectively; the first mounting hole (13) is a blind hole, and the second mounting hole (14) is a through hole; the axial ends of the guide rod (50) are respectively inserted into the first mounting hole (13) and the second mounting hole (14); the fixing plug (30) further comprises a second protruding portion (33); the second protruding portion (33) is fixed to the fitting surface (31); the second protruding portion (33) can be inserted into the second mounting hole (14); and the guide rod (50) is clamped between the second protruding portion (33) and the bottom wall of the first mounting hole (13) along the first direction (X).

7. The transmission device according to claim 6, characterized in that: The slider (60) comprises a block body (61) and a fixing plate (62); the block body (61) is provided with a light hole (611) and a U-shaped groove (612); the light hole (611) is used to pass the guide rod (50); the lead screw (40) is placed in the U-shaped groove (612); the fixing plate (62) is connected to the block body (61) by a fastener; the fixing plate (62) can close the opening of the U-shaped groove (612) in its depth direction; and the lead screw (40) is threadedly connected to the fixing plate (62).

8. The transmission device according to claim 5, characterized in that: A limiting member (41) is fixed to one axial end of the lead screw (40), and after the lead screw (40) is partially inserted into the inner ring of the bearing (20), the limiting member (41) abuts against the axial end surface of the inner ring along the first direction (X).

9. The transmission device according to claim 5, characterized in that: It also comprises a driving member, which is mounted on the bracket (10), and the output end of the driving member is drivingly connected to the other end of the lead screw (40).

10. The transmission device according to claim 9, characterized in that: The driving member is driven by the lead screw (40) through a transmission assembly (70).

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