Transmission mechanism and image forming apparatus

By designing a matching structure between the contact element and the first gear tooth in the transmission mechanism, continuous contact between the contact element and the gear tooth is ensured, solving the backlash problem in the transmission process, realizing high-precision transmission and multi-dimensional adjustment, and improving the overall accuracy and smoothness of the transmission mechanism.

CN224944216UActive Publication Date: 2026-11-06ZW OPTICAL ZWO
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Patent Information

Application Number
CN202522381018.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-11-10
Publication Date
2026-11-06
Estimated Expiration
2035-11-10

AI Technical Summary

Technical Problem

Existing transmission mechanisms suffer from low transmission efficiency and large backlash during transmission, especially when using bevel gear meshing transmission, worm gear transmission, and belt transmission, making it difficult to maintain high precision.

Method used

Design a transmission mechanism in which the first gear tooth is held abutted by two contact members. By ensuring continuous contact between the contact members and the first gear tooth in the meshing state, an adaptation design between the contact members and the gear tooth is adopted to reduce backlash, and the transmission accuracy is further improved by a multi-dimensional adjustment mechanism.

Benefits of technology

It effectively avoids backlash during transmission, improves transmission accuracy and smoothness, reduces wear on parts, and enhances the adjustment accuracy of the transmission mechanism.

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Abstract

This application provides a transmission mechanism and an imaging device. The transmission mechanism includes a first transmission wheel and a second transmission wheel. The first transmission wheel includes a first wheel body and first teeth. The first teeth are distributed on the edge of the first wheel body and protrude outward from the plane of the first wheel body. The second transmission wheel includes a second wheel body and contact members. The contact members are distributed on the edge of the second wheel body and have axial and circumferential directions. The axial direction of the contact members intersects the plane of the second wheel body. The plane of the first wheel body intersects the plane of the second wheel body. The first transmission wheel meshes with the second transmission wheel through the first teeth and the contact members. At the meshing point of the first and second transmission wheels, at least one first tooth is circumferentially contacted by two contact members. This transmission mechanism avoids backlash during transmission and improves transmission accuracy by ensuring that at least one first tooth is held by two contact members in the state of the first and second transmission wheels.
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Description

Technical Field

[0001] This application relates to the field of transmission technology, and more specifically, to a transmission mechanism and an imaging device. Background Technology

[0002] Currently, when it is necessary to change the direction of force or torque through transmission, bevel gear meshing transmission, worm gear transmission, or belt transmission are usually used.

[0003] Belt drives are typically based on friction, making them prone to slippage and resulting in low transmission efficiency. Bevel gear drives and worm gear drives, due to the presence of gaps at the meshing points, are also susceptible to backlash during transmission.

[0004] In other words, current transmission mechanisms struggle to reduce backlash during transmission while maintaining sufficient transmission efficiency. Ultimately, this results in low transmission accuracy. Utility Model Content

[0005] The purpose of this application is to provide a transmission mechanism and imaging device, which, in the meshing state, ensures that at least one tooth is held abutted by two contact members, thereby effectively avoiding backlash during transmission and improving transmission accuracy.

[0006] In a first aspect, this application provides a transmission mechanism, including a first transmission wheel and a second transmission wheel; the first transmission wheel includes a first wheel body and first teeth; the first teeth are distributed on the edge of the first wheel body and protrude outward from the plane where the first wheel body is located; the second transmission wheel includes a second wheel body and contact members; the contact members are distributed on the edge of the second wheel body; the contact members have axial and circumferential directions; wherein the axial direction of the contact members intersects the plane where the second wheel body is located; wherein the plane where the first wheel body is located intersects the plane where the second wheel body is located; the first transmission wheel meshes with the second transmission wheel through the first teeth and the contact members; at least one of the first teeth is circumferentially contacted by two of the contact members at the meshing point between the first transmission wheel and the second transmission wheel.

[0007] The aforementioned transmission mechanism effectively avoids backlash during transmission by ensuring that at least one tooth of the first gear is held abutted by two contact members in the states of the first and second transmission wheels. This improves transmission accuracy.

[0008] In conjunction with the first aspect, optionally, the contact element has a radial direction; the radial dimension of the contact element is equal to the tooth root spacing of the first gear tooth; the width of the tooth root of the first gear tooth is equal to the spacing between the contact elements.

[0009] The aforementioned transmission mechanism, by matching the spacing between the roots of the first gear teeth with the radial dimension of the contact element, and by matching the width of the roots of the first gear teeth with the spacing between the contact elements, further ensures continuous contact between the contact element and the first gear teeth during transmission, thereby further avoiding backlash during transmission and improving transmission accuracy.

[0010] In conjunction with the first aspect, optionally, the diameter of the end of the contact member closer to the second wheel body is greater than the diameter of the end of the contact member farther from the second wheel body.

[0011] In the aforementioned transmission mechanism, since the first gear teeth are distributed in a ring along the edge of the first gear body, the spacing between the first gear teeth can be narrower on the inside and wider on the outside. Therefore, by designing the contact element in a shape similar to a frustum, the fit between the contact element and the first gear teeth is further improved, thereby further enhancing the transmission accuracy.

[0012] In conjunction with the first aspect, optionally, the plane in which the first wheel body is located is perpendicular to the plane in which the second wheel body is located.

[0013] The aforementioned transmission mechanism, through its design that the plane containing the first wheel body is perpendicular to the plane containing the second wheel body, ensures that the rotation center line of the first transmission wheel is perpendicular to the rotation center line of the second transmission wheel, thereby simplifying the structural design of the bracket used to mount the first and second transmission wheels.

[0014] In conjunction with the first aspect, optionally, the axial direction of the contact element is perpendicular to the plane containing the second wheel body.

[0015] In the aforementioned transmission mechanism, with the plane containing the first wheel body perpendicular to the plane containing the second wheel body, the axial direction of the contact element is perpendicular to the plane containing the second wheel body, thus making the axial direction of the contact element parallel to the plane containing the first wheel body. To ensure sufficient contact between the contact element and the first wheel teeth, the tips of the first wheel teeth can all be located on a surface parallel to the first wheel body, which also facilitates the machining and manufacturing of the first transmission wheel.

[0016] In conjunction with the first aspect, optionally, the mechanism further includes a third transmission wheel; the third transmission wheel includes a third wheel body and third gears; the third gears are distributed on the edge of the third wheel body and protrude outward from the plane where the third wheel body is located; the plane where the third wheel body is located is parallel to the plane where the first wheel body is located; the third transmission wheel meshes with the second transmission wheel through the third gears and a contact member.

[0017] The aforementioned transmission mechanism, by adding a third transmission wheel, enables the transmission mechanism to function as a multi-dimensional adjustment mechanism, adjusting the rotation, oscillation, etc. of the target object.

[0018] In conjunction with the first aspect, optionally, at the meshing point between the third transmission wheel and the second transmission wheel, at least one of the third gear teeth is circumferentially contacted by the two contacting members.

[0019] The aforementioned transmission mechanism, by adding a third transmission wheel to enable it to function as a multi-dimensional adjustment mechanism, further reduces the backlash between the third and second transmission wheels by adopting a structure similar to the first transmission wheel. This improves the transmission accuracy of the entire transmission mechanism and consequently enhances its adjustment accuracy when used as an adjustment mechanism.

[0020] In conjunction with the first aspect, optionally, the contact member is rotatably connected to the second wheel body; wherein the rotation axis of the contact member is parallel to the axial direction.

[0021] The aforementioned transmission mechanism, through its design where the rotation axis of the contact element is parallel to the axial direction, causes the contact element to roll on the gear teeth during transmission, thereby converting the original sliding friction between the contact element and the gear teeth into rolling friction. This reduces wear between parts and improves the smoothness of the transmission process. Ultimately, it further improves transmission accuracy.

[0022] In conjunction with the first aspect, optionally, the second transmission wheel further includes a connecting shaft; the connecting shaft is distributed on the edge of the second wheel body; the contact element includes a sleeve; wherein the sleeve is rotatably fitted onto the connecting shaft.

[0023] The aforementioned transmission mechanism enables the connecting component to rotate on the second wheel body by means of a sleeve fitted onto the connecting shaft. Since the sleeve is entirely fitted onto the connecting shaft, the stability of the rotatable connection between the sleeve and the connecting shaft is improved.

[0024] Secondly, this application provides an imaging device, including a first rotating drive member, a second rotating drive member, an image acquisition member, and a transmission mechanism as described above; the first rotating drive member is connected to a first wheel body of the transmission mechanism; the second rotating drive member is connected to a third wheel body of the transmission mechanism; and the image acquisition member is connected to a second wheel body of the transmission mechanism.

[0025] The imaging device described above has the same beneficial effects as the transmission mechanism provided by the first aspect or any optional embodiment of the first aspect.

[0026] In conjunction with the second aspect, optionally, the first rotary drive component includes a first servo motor; the second rotary drive component includes a second servo motor.

[0027] The aforementioned imaging device, because servo motors have higher driving precision than ordinary motors, further improves the adjustment precision of the imaging device by using a first servo motor and a second servo motor to drive the first transmission wheel and the third transmission wheel respectively. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A first perspective view of the transmission mechanism provided in the embodiments of this application; Figure 2 A second perspective view of the transmission mechanism provided in the embodiments of this application; Figure 3 This is a third perspective view of the transmission mechanism provided in the embodiments of this application.

[0030] Icons: 100, Transmission mechanism; 110, First transmission wheel; 111, First wheel body; 112, First wheel tooth; 120, Second transmission wheel; 121, Second wheel body; 122, Contact element; 123, Connecting shaft; 130, Third transmission wheel; 131, Third wheel body; 132, Third wheel tooth; 140, Support. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this application, 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 utility model product is in use. They are only for the convenience of describing this application 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 application. 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.

[0035] Furthermore, terms such as "horizontal" and "vertical" 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 than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] Please refer to Figure 1 , Figure 1 This is a first perspective view of the transmission mechanism 100 provided in the embodiments of this application. The transmission mechanism 100 provided in the embodiments of this application includes a first transmission wheel 110 and a second transmission wheel 120. The first transmission wheel 110 and the second transmission wheel 120 can be respectively mounted on the bracket 140.

[0038] The first transmission wheel 110 includes a first wheel body 111 and first gear teeth 112. The first gear teeth 112 are distributed on the edge of the first wheel body 111 and protrude outward from the plane of the first wheel body 111. The first gear teeth 112 may protrude outward in a direction perpendicular to the plane of the first wheel body 111, or they may protrude outward in a direction oblique to the plane of the first wheel body 111. The first wheel body 111 and the first gear teeth 112 may be integrally formed, or they may be connected together by welding or other connection methods.

[0039] The second transmission wheel 120 includes a second wheel body 121 and a contact member 122. The contact member 122 abuts against the first gear tooth 112 on the first transmission wheel 110, thereby achieving the engagement between the first transmission wheel 110 and the second transmission wheel 120. The contact member 122 is distributed along the edge of the second wheel body 121. The contact member 122 has axial and circumferential directions. The axial direction of the contact member 122 intersects the plane containing the second wheel body 121. The axial direction of the contact member 122 can be oblique to the plane containing the second wheel body 121 or orthogonal to the plane containing the second wheel body 121.

[0040] The plane containing the first wheel body 111 intersects the plane containing the second wheel body 121. The planes containing the first wheel body 111 and the second wheel body 121 may or may not be perpendicular to each other. The first transmission wheel 110 meshes with the second transmission wheel 120 via the first gear tooth 112 and the contact member 122.

[0041] At the meshing point of the first transmission wheel 110 and the second transmission wheel 120, at least one first tooth 112 is circumferentially contacted by two contact members 122. That is, during the transmission process between the first transmission wheel 110 and the second transmission wheel 120, only one first tooth 112 is held by the two contact members 122. For example, during the transmission process between the first transmission wheel 110 and the second transmission wheel 120, the current first tooth 112 is held by the two contact members 122. As the transmission process continues, one of the two contact members 122 holding the current first tooth 112 gradually penetrates deeper, that is, gradually approaches the first wheel body 111. The other contact member 122 gradually moves away from the first wheel body 111. As the transmission process continues, the other contact member 122 eventually disengages from the current first tooth 112. However, before disengaging, the next first gear tooth 112 adjacent to the current first gear tooth 112, that is, the other first gear tooth 112 held by the gradually deepening contact member 122, will be clamped by the gradually deepening contact member 122 and the next adjacent contact member 122. This ensures that during transmission, at least one first gear tooth 112 is always clamped by two contact members 122, thereby eliminating backlash.

[0042] In the above implementation process, by ensuring that at least one first gear tooth 112 is held abutted by two contact members 122 in the state of the first transmission wheel 110 and the second transmission wheel 120, backlash during transmission is effectively avoided, thereby improving transmission accuracy.

[0043] Please continue to refer to Figure 1In some alternative embodiments, the contact 122 has a radial direction. The radial dimension of the contact 122 is equal to the spacing between the tooth roots of the first gear teeth 112. Taking a cylindrical contact 122 as an example, the radial direction is the direction of the diameter of the cylinder. The radial dimension is the diameter of the cylinder. The width of the tooth roots of the first gear teeth 112 is equal to the spacing between the contact 122. That is, the spacing between the tooth roots of the first gear teeth 112 matches the radial dimension of the contact 122, and the width of the tooth roots of the first gear teeth 112 matches the spacing between the contact 122.

[0044] In the above implementation process, the spacing between the tooth roots of the first gear 112 is adapted to the radial dimension of the contact member 122, and the width of the tooth roots of the first gear 112 is adapted to the spacing between the contact members 122. This further ensures continuous contact between the contact member 122 and the first gear 112 during transmission, thereby further avoiding backlash during transmission and improving transmission accuracy.

[0045] Please continue to refer to Figure 1 In some alternative embodiments, the diameter of the end of the contact 122 near the second wheel body 121 is larger than the diameter of the end of the contact 122 away from the second wheel body 121. For example, the contact 122 is frustum-shaped.

[0046] In the above implementation process, since the first gear teeth 112 are distributed in a ring along the edge of the first gear body 111, the spacing between the first gear teeth 112 can be narrower on the inside and wider on the outside. Therefore, by designing the contact member 122 in a shape similar to a frustum, the fit between the contact member 122 and the first gear teeth 112 is further improved, thereby further improving the transmission accuracy.

[0047] Please refer to Figure 2 , Figure 2 This is a second perspective view of the transmission mechanism 100 provided in the embodiments of this application. In some optional embodiments, the plane containing the first wheel body 111 is perpendicular to the plane containing the second wheel body 121.

[0048] In the above implementation process, by designing the plane where the first wheel body 111 is located to be perpendicular to the plane where the second wheel body 121 is located, the rotation center line of the first transmission wheel 110 is perpendicular to the rotation center line of the second transmission wheel 120, thereby simplifying the structural design of the bracket 140 used to install the first transmission wheel 110 and the second transmission wheel 120.

[0049] Please continue to refer to Figure 2 In some alternative embodiments, the axial direction of the contact 122 is perpendicular to the plane in which the second wheel body 121 is located.

[0050] When the plane of the first wheel body 111 is perpendicular to the plane of the second wheel body 121, the axial direction of the contact member 122 is parallel to the plane of the first wheel body 111.

[0051] In the above implementation process, when the plane where the first wheel body 111 is located is perpendicular to the plane where the second wheel body 121 is located, the axial direction of the contact member 122 is perpendicular to the plane where the second wheel body 121 is located, making the axial direction of the contact member 122 parallel to the plane where the first wheel body 111 is located. To ensure sufficient contact between the contact member 122 and the first gear tooth 112, the tooth tips of the first gear tooth 112 can be located on a surface parallel to the first wheel body 111, which also facilitates the processing and manufacturing of the first transmission wheel 110.

[0052] Please refer to Figure 3 , Figure 3 This is a third perspective view of the transmission mechanism 100 provided in the embodiments of this application. In some optional embodiments, the transmission mechanism 100 provided in the embodiments of this application further includes a third transmission wheel 130. The third transmission wheel 130 includes a third wheel body 131 and third wheel teeth 132. The third wheel teeth 132 are distributed on the edge of the third wheel body 131 and protrude out of the plane where the third wheel body 131 is located. The plane where the third wheel body 131 is located is parallel to the plane where the first wheel body 111 is located. The third transmission wheel 130 engages with the second transmission wheel 120 through the third wheel teeth 132 and the contact member 122.

[0053] In the case where the transmission mechanism 100 provided in this application embodiment further includes a third transmission wheel 130, the third transmission wheel 130, the second transmission wheel 120, and the first transmission wheel 110 can constitute a multi-dimensional adjustment mechanism. For example, when the adjustment target is connected to the second transmission wheel 120, and the first transmission wheel 110 and the third transmission wheel 130 rotate in the same direction and at the same speed, the adjustment target oscillates around the rotation center line of the first transmission wheel 110; when the first transmission wheel 110 and the third transmission wheel 130 rotate in opposite directions and at the same speed, the adjustment target rotates around the center line of the second transmission wheel 120.

[0054] In the above implementation process, by configuring a third transmission wheel 130 for the transmission mechanism 100, the transmission mechanism 100 can be used as a multi-dimensional adjustment mechanism to adjust the rotation, swing, etc. of the adjustment target.

[0055] Please continue to refer to Figure 3 In some alternative embodiments, at the meshing point between the third drive wheel 130 and the second drive wheel 120, at least one third gear tooth 132 is circumferentially contacted by two contact members 122.

[0056] In other words, the structure and shape of the third transmission wheel 130 can be the same as that of the first transmission wheel 110, thereby reducing the backlash between the third transmission wheel 130 and the second transmission wheel 120 and improving the transmission accuracy.

[0057] In the above implementation process, on the basis of configuring a third transmission wheel 130 for the transmission mechanism 100 and realizing the use of the transmission mechanism 100 as a multi-dimensional adjustment mechanism, by adopting a structure similar to the first transmission wheel 110, the backlash between the third transmission wheel 130 and the second transmission wheel 120 is reduced, thereby further reducing the backlash of the entire transmission mechanism 100, improving the transmission accuracy of the transmission mechanism 100, and correspondingly improving the adjustment accuracy of the transmission mechanism 100 when used as an adjustment mechanism.

[0058] Please continue to refer to Figure 3 In some optional embodiments, the contact 122 is rotatably connected to the second wheel body 121. The rotation axis of the contact 122 is parallel to the axial direction.

[0059] In the above implementation process, by designing the rotation axis of the contact element 122 to be parallel to the axial direction, the contact element 122 rolls on the gear teeth during transmission, thereby converting the original sliding friction between the contact element 122 and the gear teeth into rolling friction. This reduces wear between parts and improves the smoothness of the transmission process. Ultimately, it further improves the transmission accuracy.

[0060] Please continue to refer to Figure 3 In some optional embodiments, the second drive wheel 120 further includes a connecting shaft 123. The connecting shaft 123 is distributed along the edge of the second wheel body 121. The distribution of the connecting shaft 123 can be the same as the distribution of the contact members 122. In other words, the distribution of the connecting shaft 123 determines the distribution of the sleeve. The contact member 122 includes a sleeve. The sleeve is rotatably fitted onto the connecting shaft 123. The sleeve can be cylindrical or frustum-shaped as described above.

[0061] In the above implementation process, the connecting member is rotatable on the second wheel body 121 by sleeve being fitted onto the connecting shaft 123. Since the sleeve is entirely fitted onto the connecting shaft 123, the stability of the rotatable connection between the sleeve and the connecting shaft 123 is improved.

[0062] Optionally, the wear coefficient of contact 122 shall not exceed 3.0 × 10⁻⁶. -6 mm³ / (N·m).

[0063] Based on the same concept, embodiments of this application provide an imaging device, specifically a telescope. The imaging device includes a first rotation drive component, a second rotation drive component, an image acquisition component, and the transmission mechanism 100 described above. Accordingly, the image acquisition component can specifically be the objective lens of the telescope.

[0064] The first rotary drive component is connected to the first wheel body 111 of the transmission mechanism 100. The second rotary drive component is connected to the third wheel body 131 of the transmission mechanism 100. The first rotary drive component and the second rotary drive component can be a first motor and a second motor, respectively. The image acquisition component is connected to the second wheel body 121 of the transmission mechanism 100. That is, the objective lens can be connected to the second wheel body 121. Combining the different rotation modes of the first transmission wheel 110 and the third transmission wheel 130 mentioned above, the second transmission wheel 120 will be driven to move in different ways. The image acquisition component can perform different dimensional movements under the drive of the second transmission wheel 120, thereby realizing the adjustment of the image acquisition component.

[0065] The above implementation process is the same as that of the transmission mechanism 100 described above, and will not be repeated here.

[0066] In some alternative implementations, the first rotary drive includes a first servo motor. The second rotary drive includes a second servo motor.

[0067] In the above implementation process, since the servo motor has higher driving precision than the ordinary motor, the first transmission wheel 110 and the third transmission wheel 130 are driven by the first servo motor and the second servo motor respectively, thus further improving the adjustment precision of the imaging device.

[0068] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A transmission mechanism, characterized in that, Including the first transmission wheel and the second transmission wheel; The first transmission wheel includes a first wheel body and first gear teeth; the first gear teeth are distributed on the edge of the first wheel body and protrude outward from the plane of the first wheel body; The second transmission wheel includes a second wheel body and a contact element; the contact element is distributed on the edge of the second wheel body; the contact element has axial and circumferential directions; wherein, the axial direction of the contact element intersects with the plane on which the second wheel body is located; Wherein, the plane on which the first wheel body is located intersects the plane on which the second wheel body is located; the first transmission wheel meshes with the second transmission wheel through the first wheel tooth and the contact member; At the meshing point between the first transmission wheel and the second transmission wheel, at least one of the first gear teeth is circumferentially contacted by the two contacting elements.

2. The transmission mechanism according to claim 1, characterized in that, The contact element has a radial direction; The radial dimension of the contact element is equal to the tooth root spacing of the first gear tooth; The width of the root of the first tooth is equal to the spacing between the contact elements.

3. The transmission mechanism according to claim 1, characterized in that, The diameter of the end of the contact member closest to the second wheel body is greater than the diameter of the end of the contact member furthest from the second wheel body.

4. The transmission mechanism according to claim 1, characterized in that, The plane containing the first wheel body is perpendicular to the plane containing the second wheel body.

5. The transmission mechanism according to claim 4, characterized in that, in, The axial direction of the contact element is perpendicular to the plane on which the second wheel body is located.

6. The transmission mechanism according to claim 5, characterized in that, The mechanism also includes a third transmission wheel; The third transmission wheel includes a third wheel body and third wheel teeth; The third gear teeth are distributed on the edge of the third gear body and protrude outward from the plane where the third gear body is located; the plane where the third gear body is located is parallel to the plane where the first gear body is located; the third transmission wheel meshes with the second transmission wheel through the third gear teeth and the contact member.

7. The transmission mechanism according to claim 6, characterized in that, At the meshing point between the third transmission wheel and the second transmission wheel, at least one of the third gear teeth is circumferentially contacted by the two contacting elements.

8. The transmission mechanism according to any one of claims 1 to 7, characterized in that, The contact element is rotatably connected to the second wheel body; wherein the rotation axis of the contact element is parallel to the axial direction.

9. The transmission mechanism according to claim 8, characterized in that, The second drive wheel also includes a connecting shaft; The connecting shafts are distributed along the edge of the second wheel body; The contact element includes a sleeve; wherein the sleeve is rotatably fitted onto the connecting shaft.

10. An imaging device, characterized in that, It includes a first rotary drive component, a second rotary drive component, an image acquisition component, and a transmission mechanism according to claim 6; The first rotary drive component is connected to the first wheel body of the transmission mechanism; The second rotary drive component is connected to the third wheel body of the transmission mechanism; The image acquisition device is connected to the second wheel body of the transmission mechanism.

11. The imaging device according to claim 10, characterized in that, The first rotary drive component includes a first servo motor; The second rotary drive includes a second servo motor.