CN216742777U - Gear clearance eliminating mechanism, transmission device and automobile headlamp adjusting device - Google Patents
Gear clearance eliminating mechanism, transmission device and automobile headlamp adjusting device Download PDFInfo
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- CN216742777U CN216742777U CN202122419997.2U CN202122419997U CN216742777U CN 216742777 U CN216742777 U CN 216742777U CN 202122419997 U CN202122419997 U CN 202122419997U CN 216742777 U CN216742777 U CN 216742777U
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- 230000007246 mechanism Effects 0.000 title claims abstract description 46
- 238000009434 installation Methods 0.000 claims description 16
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- 238000000034 method Methods 0.000 abstract description 8
- 230000008030 elimination Effects 0.000 abstract description 6
- 238000003379 elimination reaction Methods 0.000 abstract description 6
- 230000002441 reversible effect Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 7
- 230000000670 limiting effect Effects 0.000 description 4
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- 230000006835 compression Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of gear transmission, and particularly relates to a gear clearance elimination mechanism, a transmission device and an automobile headlamp adjusting device. Because the anti-backlash subassembly can provide the elastic force in the radial of anti-backlash gear, anti-backlash gear can keep comparatively inseparable meshing all the time with external gear under the effect of elastic force like this, is in contact state always to eliminate the fit clearance between the gear, so the gear is in the in-process of switching over from forward rotation to reverse rotation, effectively reduces the phenomenon that the gear rotated certain idle stroke, improves gear drive accuracy, reduces the impact that the tooth surface of the gear produced.
Description
Technical Field
The utility model belongs to the technical field of gear transmission, and particularly relates to a gear clearance eliminating mechanism, a transmission device and an automobile headlamp adjusting device.
Background
In the field of mechanical transmission, involute gear transmission is the most widely used transmission form, and has the advantages of high transmission efficiency, stable operation, long service life and the like, and is widely applied to automobile headlamp adjusting devices. However, certain errors exist in the manufacturing and assembling of the gear, namely, the actually manufactured gear has tooth profile errors, tooth direction errors and the like, and meanwhile, the tooth surfaces of the gear have high and low fluctuation in a microscopic mode, namely the tooth surfaces of the gear cannot be perfectly superposed with a theoretical involute.
In addition, a fit clearance exists between a gear shaft for setting the gear and a corresponding mounting hole, and manufacturing errors exist in the center distance between the gear and the mounting hole, so that a small backlash exists in the meshing process of the involute gear, namely, when a pair of gears are meshed, tooth surfaces on the left side and the right side are not contacted simultaneously, and when one tooth surface of one gear is contacted, the tooth surfaces on the other side are separated by a certain distance.
From the above analysis, it can be seen that the gear rotates a certain idle stroke, i.e. the backlash distance, during the process of switching from the forward rotation to the reverse rotation. Thus, the transmission device with the positioning accuracy requirement on the positive and reverse rotation brings a plurality of adverse effects, the tooth surface of the gear can generate impact, and the reciprocating positioning accuracy of the gear transmission can be reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a gear backlash eliminating mechanism, a transmission device and an automobile headlamp adjusting device, and aims to solve the technical problem that a gear can rotate for a certain idle stroke in the process of switching from forward rotation to reverse rotation in the prior art.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a gear anti-backlash mechanism comprises an anti-backlash gear and an anti-backlash assembly, wherein the anti-backlash gear is used for being meshed with an external gear, an installation cavity is formed in the anti-backlash gear, the anti-backlash assembly is installed in the installation cavity, the anti-backlash assembly is used for providing elastic force in the radial direction of the anti-backlash gear, so that the anti-backlash gear can move in the radial direction of the anti-backlash gear relative to the anti-backlash assembly, and the anti-backlash assembly is used for being connected with an external output shaft.
Optionally, the anti-backlash assembly includes an anti-backlash guide rail and an elastic member, the anti-backlash guide rail is mounted in the mounting cavity and located in a radial direction of the anti-backlash gear, a radial gap is left between at least one end of the anti-backlash guide rail and a radial cavity wall of the mounting cavity, the elastic member abuts between the anti-backlash guide rail and the anti-backlash gear and is used for providing elastic force in the radial direction of the anti-backlash gear, and the anti-backlash guide rail is used for being connected with an external output shaft.
Optionally, the anti-backlash guide rail includes a first block, and the first block is disposed in the mounting cavity; the first block body is positioned in the circumferential direction of the anti-backlash gear, and two sides of the first block body are attached to the circumferential cavity wall of the mounting cavity; and the radial gap is reserved between at least one end of the first block body and the radial cavity wall of the mounting cavity.
Optionally, a blind hole extending along the radial direction of the anti-backlash gear is formed in the first block, and the elastic piece is arranged in the blind hole and abutted against the wall of the mounting cavity.
Optionally, the anti-backlash guide rail further comprises a second block body, the second block body is connected with the first block body, and the second block body is located outside the installation cavity and attached to the outer surface of the anti-backlash gear.
Optionally, the mounting cavity is provided on an axial end face of the anti-backlash gear.
Compared with the prior art, the gear backlash eliminating mechanism provided by the embodiment of the utility model has the beneficial effects that:
according to the gear backlash eliminating mechanism, the backlash eliminating assembly is arranged on the backlash eliminating gear, so that the backlash eliminating gear can be always kept in tight engagement with the external gear under the action of elastic force and is always in a contact state to eliminate the fit clearance between the gears in the process of meshing the backlash eliminating gear with the external gear, the phenomenon of certain idle stroke of gear rotation is effectively reduced in the process of switching the gears from forward rotation to reverse rotation, the gear transmission precision is improved, the impact generated by the tooth surfaces of the gears is reduced, and the use effect is good.
The embodiment of the utility model provides another technical scheme that:
a transmission device comprises at least one transmission gear and the gear anti-backlash mechanism, wherein the anti-backlash gear is meshed with the transmission gear.
The transmission device provided by the embodiment of the utility model uses the gear backlash eliminating mechanism, so that the backlash eliminating gear is always in a contact state when being meshed with the transmission gear, the fit clearance between the gears is eliminated, the gear transmission precision is improved, the impact generated by the tooth surface of the gear is reduced, and the use effect is good.
Optionally, the transmission device further comprises a driving part, and a driving end of the driving part is connected with the transmission gear and drives the transmission gear to rotate;
or the transmission device further comprises a driving part and a transmission mechanism, the driving end of the driving part is connected with the input end of the transmission mechanism and drives the transmission mechanism to rotate, and the output end of the transmission mechanism is connected with the transmission gear and drives the transmission gear to rotate.
Optionally, the transmission device further comprises an output shaft, and when the anti-backlash assembly comprises an anti-backlash guide rail and an elastic part, the anti-backlash guide rail is fixedly connected with the output shaft and used for driving the output shaft to rotate.
The embodiment of the utility model provides a further technical scheme that:
an automobile headlamp adjusting device comprises the transmission device.
According to the automobile headlamp adjusting device provided by the embodiment of the utility model, due to the adoption of the transmission device, the precision of adjusting the angle of the automobile lamp is effectively improved, and the safety of driving the automobile at night is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a gear backlash elimination mechanism provided in an embodiment of the present invention;
FIG. 2 is an exploded view of the gear backlash mechanism of FIG. 1;
FIG. 3 is a schematic diagram of a portion of a transmission according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the transmission of FIG. 3;
FIG. 5 is a schematic structural diagram of a transmission according to an embodiment of the present invention;
fig. 6 is a schematic view of an internal structure of a transmission according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
10-anti-backlash gear;
11-mounting cavity; 111-radial chamber walls; 112-circumferential chamber walls;
20-a backlash elimination assembly;
21-a backlash eliminating guide rail; 22-an elastic member; 211 — a first block; 212 — a second block; 213-blind hole;
30-radial clearance;
40-a transmission gear;
50-a driving member;
60, a transmission mechanism;
70-an output shaft;
80-a housing.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to fig. 1-6 are exemplary and intended to be used to illustrate the utility model, but are not to be construed as limiting the utility model.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, 2 and 3, a description will now be given of a gear backlash elimination mechanism provided in an embodiment of the present invention. The gear anti-backlash mechanism comprises an anti-backlash gear 10 and an anti-backlash assembly 20, wherein the anti-backlash gear 10 is used for being meshed with an external gear, a mounting cavity 11 is arranged on the anti-backlash gear 10, the anti-backlash assembly 20 is mounted in the mounting cavity 11, the anti-backlash assembly 20 is used for providing elastic force in the radial direction of the anti-backlash gear 10, so that the anti-backlash gear 10 can move in the radial direction of the anti-backlash gear 10 relative to the anti-backlash assembly 20, and the anti-backlash assembly 20 is used for being connected with an external output shaft 70.
Compared with the prior art, the gear backlash eliminating mechanism provided by the embodiment of the utility model has the advantages that the backlash eliminating assembly 20 is arranged on the backlash eliminating gear 10, so that in the process of meshing the backlash eliminating gear 10 with an external gear, because the backlash eliminating assembly 20 can provide elastic force in the radial direction of the backlash eliminating gear 10, the backlash eliminating gear 10 is always kept in relatively close meshing with the external gear under the action of the elastic force and is always in a contact state to eliminate the fit clearance between the gears, the phenomenon of certain idle stroke of gear rotation is effectively reduced in the process of switching the gear from forward rotation to reverse rotation, the gear transmission precision is improved, the impact generated by the tooth surface of the gear is reduced, and the use effect is good.
The anti-backlash gear 10 is preferably a sector gear box, and can also be a non-eccentric gear of other types; the external gear may be any of various gears combined with the anti-backlash gear 10, as desired.
In one embodiment, as shown in fig. 1, 2 and 4, the anti-backlash assembly 20 includes an anti-backlash guide rail 21 and an elastic member 22, the anti-backlash guide rail 21 is installed in the installation cavity 11 and located in a radial direction of the anti-backlash gear 10, a radial gap 30 is left between at least one end of the anti-backlash guide rail 21 and a radial cavity wall 111 of the installation cavity 11, the elastic member 22 abuts between the anti-backlash guide rail 21 and the anti-backlash gear 10 and is used for providing elastic force in the radial direction of the anti-backlash gear 10, and the anti-backlash guide rail 21 is used for being connected with the external output shaft 70.
Specifically, when in use, the anti-backlash guide rail 21 is in a fixed state, and the anti-backlash guide rail 21 is used for guiding the anti-backlash gear 10 to move in the radial direction; the radial gap 30 left between the anti-backlash guide rail 21 and the radial cavity wall 111 of the mounting cavity 11 in the radial direction of the anti-backlash gear 10 is used as a radial moving space of the anti-backlash gear 10, so that the anti-backlash gear 10 can move back and forth in the radial direction along the anti-backlash guide rail 21.
Then, as the anti-backlash guide rail 21 is in a fixed state, the elastic part 22 is abutted between the anti-backlash guide rail 21 and the anti-backlash gear 10 in a certain compression state, when the anti-backlash gear 10 is not tightly meshed with an external gear, the elastic part 22 moves the anti-backlash gear 10 towards the external gear through the action of the elastic force of the elastic part, so that the anti-backlash gear and the external gear are tightly meshed, the fit clearance between the gears is eliminated, and the requirement of accurate small transmission of a product is met; when the anti-backlash gear 10 and the external gear are meshed too tightly, namely the meshed gap between the anti-backlash gear 10 and the external gear is too small, the elastic part 22 can be compressed, the normal meshing of the anti-backlash gear 10 and the external gear is ensured, and the elastic part 22 plays a good adjusting role.
The elastic member 22 is preferably an elongated spring, but may be other types of elastic members capable of providing a back-and-forth elastic force.
In one embodiment, as shown in fig. 2 and 4, the anti-backlash guide rail 21 includes a first block 211, and the first block 211 is disposed in the installation cavity 11; the first block 211 is positioned in the circumferential direction of the anti-backlash gear 10, and two sides of the first block are attached to the circumferential cavity wall 112 of the installation cavity 11; in the radial direction of the anti-backlash gear 10, a radial gap 30 is left between at least one end of the first block 211 and the radial cavity wall 111 of the mounting cavity 11.
Specifically, through making the both sides of first block 211 and the laminating of the circumference chamber wall 112 of installation cavity 11, can make first block 211 and eliminate between the clearance gear 10 can accurate transmission in circumference like this, eliminate clearance gear 10 promptly and can drive first block 211 synchronous revolution in circumference to when making first block 211 be connected with outside output shaft 70, drive outside output shaft 70 and rotate, realize the transmission. The radial gap 30 left between the first block 211 and the radial cavity wall 111 of the installation cavity 11 is a radial moving space of the anti-backlash gear 10.
The shape of the first block 211 is preferably a long-bar column, such as: a cylinder, a cuboid, a cube or other cylindrical bodies with polygonal cross sections.
In one embodiment, as shown in fig. 2, the first block 211 is provided with a blind hole 213 extending along the radial direction of the anti-backlash gear 10, and the elastic member 22 is disposed in the blind hole 213 and abuts against the wall of the mounting cavity 11.
Specifically, by arranging the blind hole 213 adapted to the elastic element 22, after the elastic element 22 is disposed in the blind hole 213, the blind hole 213 limits the elastic element 22, so as to ensure that the elastic element 22 generates elastic force in the radial direction of the anti-backlash gear 10, so as to drive the anti-backlash gear 10 to move in the radial direction.
In one embodiment, as shown in fig. 2, the anti-backlash guide rail 21 further includes a second block 212, the second block 212 is connected to the first block 211, and the second block 212 is located outside the mounting cavity 11 and abuts against the outer surface of the anti-backlash gear 10.
Specifically, the second block 212 sets up and laminates with the surface of anti-backlash gear 10 outside installation cavity 11, at first plays the limiting action, and the first block 211 of restriction breaks away from installation cavity 11, then also plays supplementary guide effect for anti-backlash gear 10 can be more steady at radial movement relative to first block 211, guarantees transmission accuracy.
In one embodiment, as shown in FIG. 1, a mounting cavity 11 is provided on an axial end face of the anti-backlash gear 10.
Specifically, the mounting cavity 11 is disposed on the axial end face of the anti-backlash gear 10, so that the anti-backlash assembly 20 can drive the anti-backlash gear 10 to be tightly engaged with an external gear on the premise of not affecting gear engagement.
As shown in fig. 3, 4 and 5, an embodiment of the present invention further provides a transmission device, which includes at least one transmission gear 40 and the above-mentioned gear backlash elimination mechanism, wherein the backlash elimination gear 10 is engaged with the transmission gear 40.
The transmission device provided by the embodiment of the utility model uses the gear backlash eliminating mechanism, so that the backlash eliminating gear 10 is always in a contact state when being meshed with the transmission gear 40, the fit clearance between the gears is eliminated, the gear transmission precision is improved, the impact generated by the tooth surfaces of the gears is reduced, and the use effect is good.
In one embodiment, as shown in fig. 6, the transmission device further includes a driving member 50, and the driving end of the driving member 50 is connected with the transmission gear 40 and drives the transmission gear 40 to rotate.
Specifically, when the anti-backlash mechanism is used, the transmission gear 40 is meshed with the anti-backlash gear 10, the driving part 50 serves as a power input end of the transmission gear 40, the driving part 50 drives the transmission gear 40 to rotate, the anti-backlash gear 10 is driven to rotate through the transmission gear 40, and the anti-backlash gear 10 drives the external output shaft 70 connected with the anti-backlash assembly 20 to rotate, so that a rotating function is achieved.
The driving member 50 may be a motor, but not limited to a motor, and may be electrically connected to the external connection port through a terminal wire/FPC for providing power.
In one embodiment, as shown in fig. 6, the transmission device further includes a driving member 50 and a transmission mechanism 60, wherein a driving end of the driving member 50 is connected to an input end of the transmission mechanism 60 and drives the transmission mechanism 60 to rotate, and an output end of the transmission mechanism 60 is connected to the transmission gear 40 and drives the transmission gear 40 to rotate.
Specifically, the transmission mechanism 60 can be arranged between the driving element 50 and the transmission gear 40, so that the transmission mechanism 60 has a decelerating effect or an accelerating effect between the driving element 50 and the transmission gear 40, and the specific effect can be realized by adjusting the transmission ratio of the gears in the transmission mechanism 60, and the setting is carried out according to needs.
Further, the transmission device further comprises a housing 80, the driving element 50, the transmission mechanism 60, the transmission gear 40 and the gear backlash eliminating mechanism are all installed in the housing 80, and an output hole for inserting the external output shaft 70 is formed in the housing 80.
Wherein, the transmission mechanism 60 may be a gear transmission assembly, a parallel shaft gear transmission assembly, a planetary gear transmission assembly, or the like.
The drive of the drive 60 can be a single-stage drive or a multi-stage drive.
The transmission type of the transmission mechanism 60 may be worm gear transmission, straight gear transmission, face gear transmission, helical gear transmission, or the like.
In one embodiment, as shown in fig. 6, the transmission device further includes an output shaft 70, and the anti-backlash guide rail 21 is fixedly connected to the output shaft 70 and is configured to drive the output shaft 70 to rotate.
Specifically, one end of the output shaft 70 is fixedly connected with the anti-backlash guide rail 21, the other end of the output shaft 70 extends out of the output hole of the housing 80 to be connected with an external device, and the output shaft 70 defines a working center of the anti-backlash assembly 20 to drive the external device to rotate, so that accurate transmission is realized.
With the continuous development of automotive electronics technology, safe driving and intelligent driving have put higher and higher requirements on the fields of automotive electronics and automotive structural design. As an important part of night safety driving, the headlamp adjusting device of the automobile needs to have certain accuracy.
The embodiment of the utility model also provides an automobile headlamp adjusting device which comprises the transmission device.
According to the automobile headlamp adjusting device provided by the embodiment of the utility model, due to the adoption of the transmission device, the precision of adjusting the angle of the automobile lamp is effectively improved, and the safety of driving the automobile at night is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a gear backlash eliminating mechanism which characterized in that: the anti-backlash device comprises an anti-backlash gear and an anti-backlash assembly, wherein the anti-backlash gear is used for being meshed with an external gear, an installation cavity is arranged on the anti-backlash gear, the anti-backlash assembly is installed in the installation cavity, the anti-backlash assembly is used for providing elastic force in the radial direction of the anti-backlash gear, so that the anti-backlash gear can move in the radial direction of the anti-backlash gear relative to the anti-backlash assembly, and the anti-backlash assembly is used for being connected with an external output shaft.
2. The gear backlash mechanism of claim 1, wherein: the anti-backlash assembly comprises an anti-backlash guide rail and an elastic part, the anti-backlash guide rail is arranged in the installation cavity and is positioned in the radial direction of the anti-backlash gear, a radial gap is reserved between at least one end of the anti-backlash guide rail and the radial cavity wall of the installation cavity, the elastic part is abutted between the anti-backlash guide rail and the anti-backlash gear and used for providing elastic force in the radial direction of the anti-backlash gear, and the anti-backlash guide rail is used for being connected with an external output shaft.
3. The gear backlash mechanism of claim 2, wherein: the anti-backlash guide rail comprises a first block body, and the first block body is arranged in the mounting cavity; the first block body is positioned in the circumferential direction of the anti-backlash gear, and two sides of the first block body are attached to the circumferential cavity wall of the mounting cavity; and the radial gap is reserved between at least one end of the first block body and the radial cavity wall of the mounting cavity.
4. The gear backlash mechanism of claim 3, wherein: the first block body is provided with a blind hole extending along the radial direction of the anti-backlash gear, and the elastic piece is arranged in the blind hole and abutted against the wall of the mounting cavity.
5. The gear backlash mechanism of claim 3, wherein: the anti-backlash guide rail further comprises a second block body, the second block body is connected with the first block body, and the second block body is located outside the installation cavity and attached to the outer surface of the anti-backlash gear.
6. The gear backlash mechanism of claim 2, wherein: the mounting cavity is arranged on the axial end face of the anti-backlash gear.
7. A transmission, characterized by: the gear backlash eliminating mechanism comprises at least one transmission gear and the gear backlash eliminating mechanism as claimed in any one of claims 1 to 6, wherein the backlash eliminating gear is meshed with the transmission gear.
8. The transmission of claim 7, wherein: the driving device further comprises a driving piece, and a driving end of the driving piece is connected with the transmission gear and drives the transmission gear to rotate;
or the transmission device further comprises a driving part and a transmission mechanism, the driving end of the driving part is connected with the input end of the transmission mechanism and drives the transmission mechanism to rotate, and the output end of the transmission mechanism is connected with the transmission gear and drives the transmission gear to rotate.
9. The transmission of claim 7, wherein: the transmission device further comprises an output shaft, and when the anti-backlash assembly comprises an anti-backlash guide rail and an elastic piece, the anti-backlash guide rail is fixedly connected with the output shaft and used for driving the output shaft to rotate.
10. An automobile headlamp adjusting device is characterized in that: a transmission comprising a drive as claimed in any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122419997.2U CN216742777U (en) | 2021-10-08 | 2021-10-08 | Gear clearance eliminating mechanism, transmission device and automobile headlamp adjusting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122419997.2U CN216742777U (en) | 2021-10-08 | 2021-10-08 | Gear clearance eliminating mechanism, transmission device and automobile headlamp adjusting device |
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| CN216742777U true CN216742777U (en) | 2022-06-14 |
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| CN202122419997.2U Active CN216742777U (en) | 2021-10-08 | 2021-10-08 | Gear clearance eliminating mechanism, transmission device and automobile headlamp adjusting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944747A (en) * | 2021-10-08 | 2022-01-18 | 东莞市兆威机电有限公司 | Gear clearance eliminating mechanism, transmission device and automobile headlamp adjusting device |
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2021
- 2021-10-08 CN CN202122419997.2U patent/CN216742777U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944747A (en) * | 2021-10-08 | 2022-01-18 | 东莞市兆威机电有限公司 | Gear clearance eliminating mechanism, transmission device and automobile headlamp adjusting device |
| CN113944747B (en) * | 2021-10-08 | 2025-02-21 | 东莞市兆威机电有限公司 | Gear backlash eliminating mechanism, transmission device and automobile headlight adjustment device |
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