Worm and gear mechanism suitable for automatic clearance elimination

Abstract

The utility model discloses a worm and gear mechanism suitable for automatic clearance elimination. The worm and gear mechanism comprises a worm and a worm gear assembly suitable for being meshed with the worm. The worm wheel assembly comprises a hub, a first worm wheel piece detachably assembled and matched with the hub, and a second worm wheel piece arranged on the hub in a sleeving mode. The first worm wheel piece and the second worm wheel piece are the same in outer diameter and suitable for being meshed with the worm. The first worm wheel piece and the second worm wheel piece are suitable for being in magnetic attraction fit. A pair of first magnetic blocks is embedded in the first worm wheel piece, and a second magnetic block is embedded in the second worm wheel piece. Through the first magnetic block arranged on the first worm gear piece and the second magnetic block arranged on the second worm gear piece, teeth of the worm can be firmly clamped between the first worm gear piece and the fixed second worm gear piece, so that a gap between the worm gear and the worm is eliminated, and even if the worm gear and the worm are abraded, the worm gear and the worm cannot be damaged. And the gap can be automatically eliminated through the magnetic force of the magnetic block.

Description

Technical Field

[0001] This utility model relates to the field of transmission equipment technology, and in particular to a worm gear mechanism suitable for automatic backlash elimination. Background Technology

[0002] Worm gear transmission refers to a speed reduction transmission with the worm as the main motion. When the reverse stroke is not self-locking, the worm wheel can also be used as the main motion for speed increase. Worm gear transmission is mainly realized through the meshing worm wheel and worm structure. The worm wheel and worm structure is often used to transmit motion and power between two intersecting shafts. The worm wheel and worm are equivalent to a gear and rack in their middle plane, and the worm is also similar in shape to a screw.

[0003] When installing a worm gear, it is necessary to ensure that the worm gears mesh with each other without any gaps. Gaps between the worm gears can cause excessive noise during transmission and will also accelerate wear between the worm gears and worms. Therefore, gap adjustment is required during the installation of the worm gear.

[0004] Worm gears will wear out after prolonged use, leading to an increase in the gap between the worm gears and worms. This affects the meshing relationship between the worm gears and worms, which is not conducive to the normal transmission of the worm gears; therefore, it does not meet the current requirements.

[0005] To address this, existing technologies typically employ methods for eliminating backlash in worm gear systems, including increasing the manufacturing precision of the worm gear, using materials with better wear resistance to process the worm gear, or incorporating springs into the worm gear for tension to compensate for the backlash. However, these methods either increase existing manufacturing costs, consuming significant manpower and resources, or make the installation and maintenance of the worm gear mechanism inconvenient, leading to a risk of compromising the mechanism's stability with each maintenance. Based on this situation, CN208634321U discloses a precision worm gear pair backlash elimination device, which achieves the backlash elimination effect by combining screws, anti-loosening washers, wedges, compression springs, and top blocks to form an adjustment and locking mechanism. However, this disclosed technology also suffers from structural complexity.

[0006] Therefore, in view of the problems existing in the backlash elimination methods used in worm gears, it is necessary to optimize the structure of worm gears that can automatically eliminate backlash. Utility Model Content

[0007] The purpose of this invention is to provide a worm gear mechanism suitable for automatic backlash elimination, so as to solve the technical problem of optimizing its overall structure.

[0008] The worm gear mechanism suitable for automatic backlash elimination of this utility model is implemented as follows:

[0009] A worm gear mechanism suitable for automatic backlash elimination includes: a worm, and a worm gear assembly adapted to mesh with the worm; wherein...

[0010] The worm gear assembly includes a hub, a first worm gear plate that is detachably assembled with the hub, and a second worm gear plate that is fitted onto the hub;

[0011] The first and second worm gears have the same outer diameter and are both suitable for meshing with the worm; and

[0012] The first worm gear plate and the second worm gear plate are adapted to magnetic attraction; and a pair of first magnetic blocks are embedded on the first worm gear plate, and a second magnetic block is embedded on the second worm gear plate.

[0013] In an optional embodiment of this invention, the wheel hub includes a cylindrical body and a pair of extension plates disposed on the outer side wall of the cylindrical body; and

[0014] Each of the extension pieces is provided with a threaded hole;

[0015] The first worm gear plate has a mounting hole for mating with a threaded hole, so that the first worm gear plate is suitable for mating with a pair of extension plates by screws.

[0016] In an optional embodiment of this invention, the second worm gear plate is provided with a clearance hole suitable for corresponding to a pair of extension plates.

[0017] In an optional embodiment of this invention, the first magnetic block and the second magnetic block are staggered along the circumferential direction.

[0018] In an optional embodiment of this utility model, the second worm gear plate is provided with a pair of through holes that correspond one-to-one with a pair of first magnetic blocks on the first worm gear plate.

[0019] In an optional embodiment of this utility model, an alignment hole is also designed on the first worm gear plate and the second worm gear plate respectively;

[0020] When the first and second worm gears are assembled and mesh with the worm, the alignment holes on the first and second worm gears are connected.

[0021] In an optional embodiment of this invention, both the first and second magnetic blocks employ a radial magnetization structure.

[0022] In an optional embodiment of this utility model, the first worm gear plate has a pre-set first mounting hole for mounting the first magnet; and

[0023] The second worm gear plate has a pre-set second mounting hole for mounting the second magnet.

[0024] In an optional embodiment of this invention, the outer edge of the first magnet is adapted to be bonded and fixed to the inner edge of the first mounting hole; and

[0025] The outer edge of the second magnet is adapted to be bonded and fixed to the inner edge of the second mounting hole.

[0026] In an optional embodiment of this invention, a pair of first magnetic blocks on the first worm gear are centrally symmetrically distributed about the axis of the first worm gear; and

[0027] The pair of second magnetic blocks on the second worm gear plate are centrally symmetrical about the axis of the second worm gear plate.

[0028] By adopting the above technical solution, this utility model has the following beneficial effects: The worm gear mechanism of this utility model, which is suitable for automatic backlash elimination, achieves magnetic attraction between the first worm gear and the second worm gear by using a first magnetic block set on the first worm gear and a second magnetic block set on the second worm gear. This can firmly clamp the teeth of the worm between the teeth of the first worm gear and the fixed second worm gear, thereby eliminating the backlash between the worm gear and the worm. Even if wear occurs between the worm gear and the worm, the backlash can be automatically eliminated by the magnetic force of the magnetic block. Attached Figure Description

[0029] Figure 1 This is a first-view structural schematic diagram of the worm gear mechanism suitable for automatic backlash elimination according to this utility model;

[0030] Figure 2 This is a second-view structural schematic diagram of the worm gear mechanism suitable for automatic backlash elimination according to this utility model;

[0031] Figure 3 yes Figure 2 Sectional view along direction A;

[0032] Figure 4 This is a third-view structural diagram of the worm gear mechanism suitable for automatic backlash elimination according to this utility model.

[0033] In the figure: worm 1, first worm wheel 2, second worm wheel 3, first magnet 4, second magnet 5, first mounting hole 6, second mounting hole 7, columnar body 8, extension plate 9, threaded hole 10, mounting hole 11, clearance hole 12, through hole 13, alignment hole 14. Detailed Implementation

[0034] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0035] Example 1:

[0036] Please see Figures 1 to 4As shown, this embodiment provides a worm gear mechanism suitable for automatic backlash elimination, including: a worm 1, and a worm gear assembly suitable for meshing with the worm 1; wherein the worm gear assembly includes a hub, a first worm gear plate 2 detachably assembled with the hub, and a second worm gear plate 3 fitted on the hub; the first worm gear plate 2 and the second worm gear plate 3 have the same outer diameter and are both suitable for meshing with the worm 1.

[0037] Based on the above structure, it should be noted that the first worm gear plate 2 and the second worm gear plate 3 are adapted to magnetic attraction; for this purpose, a pair of first magnetic blocks 4 are embedded on the first worm gear plate 2, and a second magnetic block 5 is embedded on the second worm gear plate 3.

[0038] Specifically, the first magnetic block 4 and the second magnetic block 5 are staggered along the circumferential direction. Both the first magnetic block 4 and the second magnetic block 5 adopt an axial magnetization structure. A pair of first magnetic blocks 4 on the first worm gear plate 2 are centrally symmetrically distributed about the axis of the first worm gear plate 2; and a pair of second magnetic blocks 5 on the second worm gear plate 3 are centrally symmetrically distributed about the axis of the second worm gear plate 3. This design ensures that the magnetic attraction force generated between the first worm gear plate 2 and the second worm gear plate 3 is uniform and reliable. In an optional embodiment, both the first magnetic block 4 and the second magnetic block 5 are made of neodymium iron boron material, which has a magnetic force about three times greater than that of ordinary ferrite, and are nickel-plated on the surface, making them less susceptible to corrosion.

[0039] Based on the above structure, it is also necessary to explain that the first worm gear 2 has a pre-set first mounting hole 116 for mounting the first magnet 4; and the second worm gear 3 has a pre-set second mounting hole 117 for mounting the second magnet 5. Preferably, both the first mounting hole 116 and the second mounting hole 117 are circular holes, and both the first magnet 4 and the second magnet 5 are cylindrical structures. Furthermore, preferably, the first mounting hole 116 and the second mounting hole 117 are the same size, so that the first magnet 4 and the second magnet 5 do not need to be distinguished during use.

[0040] The outer edge of the first magnetic block 4 is adapted to be bonded and fixed to the inner edge of the first mounting hole 116; and

[0041] The outer edge of the second magnet 5 is suitable for bonding and fixing to the inner edge of the second mounting hole 117. Adhesive can be used for bonding here, and this bonding method can prevent the fit from loosening.

[0042] Furthermore, the hub includes a cylindrical body 8 and a pair of extension plates 9 disposed on the outer side wall of the cylindrical body 8; each extension plate 9 is provided with a threaded hole 10; the first worm gear plate 2 is provided with a mounting hole 11 for engaging with the threaded hole 10, so that the first worm gear plate 2 is suitable for mating with the pair of extension plates 9 by screws. The second worm gear plate 3 is provided with a clearance hole 12 adapted to correspond to the pair of extension plates 9. The design of the clearance hole 12 can satisfy the mating of the first worm gear plate 2 and the extension plate 9 without interfering with the second worm gear plate 3. Based on this structure, the second worm gear 3 is directly fitted onto the cylindrical body 8 of the hub, forming a tight fit between the second worm gear 3 and the hub. The first worm gear 2 is connected to the hub by screws, allowing it to float within a small range relative to the hub. This allows for a small range of relative rotation between the first gear 2 and the second gear 3, creating a scissor-like opening between the teeth of the first gear 2 and the second gear 3. This opening can be distributed to abut against two different sides of the teeth on the worm 1, thus eliminating meshing clearance.

[0043] Furthermore, the second worm gear plate 3 has a pair of through holes 13 that correspond one-to-one with a pair of first magnetic blocks 4 on the first worm gear plate 2. The first worm gear plate 2 and the second worm gear plate 3 are also each designed with an alignment hole 14; when the first worm gear plate 2 and the second worm gear plate 3 are assembled and mesh with the worm 1, the alignment holes 14 on the first worm gear plate 2 and the second worm gear plate 3 are connected. Here, the alignment holes 14 on the first worm gear plate 2 and the second worm gear plate 3 are of the same size.

[0044] In summary, for the worm gear mechanism suitable for automatic backlash elimination in this embodiment, the first magnetic block 4 set on the first worm gear 2 and the second magnetic block 5 set on the second worm gear 3 can firmly clamp the teeth of the worm 1 between the teeth of the first worm gear 2 and the fixed second worm gear 3, thereby eliminating the backlash between the worm gear and the worm. Even if wear occurs between the worm gear and the worm, the magnetic attraction between the first worm gear 2 and the second worm gear 3 caused by the action of the first magnetic block 4 and the second magnetic block 5 can automatically eliminate the mating clearance between the worm gear and the worm 1. The overall structure is easy to assemble, and the overall material and production costs are relatively low. Specifically, prepare the first worm gear 2, the second worm gear 3, the first magnetic block 4, the second magnetic block 5, and the worm 1. Mount the second magnetic block 5 into the second worm gear 3. The second worm gear 3 is concentrically fitted onto the hub. The first worm gear 2 is fixed to the screw holes in the hub with screws. Then, simultaneously engage the first worm gear 2 and the second worm gear 3 with the worm 1. After engagement, install the first magnetic block 4 into the first worm gear 2 and secure it with glue. For disassembly, use a heat gun to soften the glue, then use a tool to push the first worm gear 2 out through the through hole 13 of the second worm gear 3. Then, disassemble the parts in reverse order of assembly.

[0045] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0046] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0050] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A worm gear mechanism suitable for automatic backlash elimination, characterized in that, Includes: a worm gear, and a worm wheel assembly adapted to mesh with the worm gear; in The worm gear assembly includes a hub, a first worm gear plate that is detachably assembled with the hub, and a second worm gear plate that is fitted onto the hub; The first and second worm gears have the same outer diameter and are both suitable for meshing with the worm; and The first worm gear plate and the second worm gear plate are adapted to magnetic attraction; and a pair of first magnetic blocks are embedded on the first worm gear plate, and a second magnetic block is embedded on the second worm gear plate.

2. The worm gear mechanism suitable for automatic backlash elimination according to claim 1, characterized in that, The hub includes a cylindrical body and a pair of extension plates disposed on the outer side wall of the cylindrical body; and Each of the extension pieces is provided with a threaded hole; The first worm gear plate has a mounting hole for mating with a threaded hole, so that the first worm gear plate is suitable for mating with a pair of extension plates by screws.

3. The worm gear mechanism suitable for automatic backlash elimination according to claim 2, characterized in that, The second worm gear plate is provided with clearance holes suitable for corresponding to a pair of extension plates.

4. The worm gear mechanism suitable for automatic backlash elimination according to any one of claims 1 to 3, characterized in that, The first and second magnetic blocks are staggered along the circumferential direction.

5. The worm gear mechanism suitable for automatic backlash elimination according to claim 4, characterized in that, The second worm gear plate has a pair of through holes that correspond one-to-one with a pair of first magnetic blocks on the first worm gear plate.

6. The worm gear mechanism suitable for automatic backlash elimination according to any one of claims 1 to 3, characterized in that, The first and second worm gear plates are also designed with an alignment hole; When the first and second worm gears are assembled and mesh with the worm, the alignment holes on the first and second worm gears are connected.

7. The worm gear mechanism suitable for automatic backlash elimination according to claim 1, characterized in that, Both the first and second magnetic blocks employ a radial magnetization structure.

8. The worm gear mechanism suitable for automatic backlash elimination according to claim 1, characterized in that, The first worm gear plate has a pre-set first mounting hole for mounting the first magnet; and The second worm gear plate has a pre-set second mounting hole for mounting the second magnet.

9. The worm gear mechanism suitable for automatic backlash elimination according to claim 8, characterized in that, The outer edge of the first magnet is adapted to be bonded and fixed to the inner edge of the first mounting hole; and The outer edge of the second magnet is adapted to be bonded and fixed to the inner edge of the second mounting hole.

10. The worm gear mechanism suitable for automatic backlash elimination according to claim 1 or 8, characterized in that, A pair of first magnetic blocks on the first worm gear plate are centrally symmetrically distributed about the axis of the first worm gear plate; and The pair of second magnetic blocks on the second worm gear plate are centrally symmetrical about the axis of the second worm gear plate.

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