Transmission mechanism

Abstract

The utility model discloses a transmission mechanism which is used for transmitting power between a first main body and a second main body. One end of the pitch shaft is fixedly connected to the first main body, and the worm gear and the worm are rotatably mounted on the second main body and are meshed with each other; one end, far away from the first main body, of the pitch shaft is fixedly connected with the worm gear; and a coupling boss and a coupling groove matched with the coupling boss are respectively arranged on the contact surface of the pitch shaft and the worm wheel. According to the transmission mechanism, the coupler boss and the coupler groove are integrally arranged on the worm wheel and the pitch shaft respectively, so that the result that the installation space is increased due to the arrangement of the coupler is avoided, the structure of the transmission mechanism is more compact, and meanwhile, the transmission load between the worm wheel and the pitch shaft is effectively improved through the integrated design.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to a transmission mechanism. Background Art

[0002] In PTZ security products, the camera housing usually only moves in the pitch direction. In practice, the transmission parts such as worm gears are usually connected to the pitch axis of the camera housing through a coupling, which will result in a certain limit to its transmission load and also require a larger installation space. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a transmission mechanism which has a compact structure and can effectively increase the transmission load.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a transmission mechanism for transmitting power between a first body and a second body; comprising a pitch shaft having one end fixedly connected to the first body and a worm wheel and a worm rotatably mounted on the second body, the worm wheel and the worm being meshed with each other; the pitch shaft is coaxially arranged with the worm wheel, and one end of the pitch shaft away from the first body is fixedly connected to the worm wheel; a coupling boss and a coupling groove cooperating with the coupling boss are respectively provided on the contact surfaces of the pitch shaft and the worm wheel.

[0005] Furthermore, the coupling boss is provided on the worm wheel, and the coupling groove is provided on the pitch shaft; or, the coupling groove is provided on the worm wheel, and the coupling boss is provided on the pitch shaft.

[0006] Furthermore, the number of the coupling bosses and the coupling grooves is multiple, and the multiple coupling bosses and coupling grooves are evenly distributed around the axial direction of the worm wheel.

[0007] Furthermore, it also includes a first screw, and the worm gear and the pitch axis are fixedly connected by the first screw.

[0008] Furthermore, there are multiple first screws, and the multiple first screws are evenly distributed around the axial direction of the worm wheel.

[0009] Furthermore, it also includes a fixed sleeve, which is fixedly installed on the second main body, and at least one bearing is arranged in the fixed sleeve, and the pitch axis passes through the bearing.

[0010] Furthermore, it also includes a limiting ring, an annular limiting shoulder is provided in the fixing sleeve, the limiting ring is detachably mounted on one end of the fixing sleeve, and an annular groove for accommodating the bearing is formed between the limiting ring and the limiting shoulder.

[0011] Furthermore, at least one limiting boss is provided on a side of the limiting ring close to the worm wheel, and a limiting bulge is provided on an end face of the worm wheel close to the limiting ring, and the limiting boss is used to abut against the limiting bulge.

[0012] Furthermore, it also includes a second screw, and the limiting ring and the fixing sleeve are fixedly connected by the second screw.

[0013] Furthermore, it also includes a photoelectric sensor, which is fixedly connected to the second body, and a triggering member is provided on the worm gear corresponding to the photoelectric sensor.

[0014] The beneficial effect of the utility model is that the transmission mechanism integrates the coupling boss and the coupling groove on the turbine and the pitch shaft respectively, thereby avoiding the increase in installation space caused by the setting of the coupling, making its own structure more compact. At the same time, the integrated design also effectively increases the transmission load between the worm gear and the pitch shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the working state of the transmission mechanism of the first embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the transmission mechanism of the first embodiment of the utility model;

[0017] Figure 3 It is a cross-sectional view of the transmission mechanism of the first embodiment of the utility model;

[0018] Figure 4 It is a schematic structural diagram of a worm wheel, a worm and a trigger member in a transmission mechanism of Embodiment 1 of the present utility model;

[0019] Figure 5 This is a schematic structural diagram of the pitch axis in the transmission mechanism of the first embodiment of the utility model;

[0020] Figure 6 It is a schematic structural diagram of a fixed sleeve, a limiting ring and a bearing in a transmission mechanism of Embodiment 1 of the utility model.

[0021] Description of labels:

[0022] 1. Pitch axis; 11. Coupling groove;

[0023] 2. Worm gear; 21. Coupling boss; 22. Limiting convex block; 23. Trigger member;

[0024] 3. Worm;

[0025] 4. First screw;

[0026] 5. Fixed sleeve; 51. Limit waistcoat;

[0027] 6. Bearings;

[0028] 7. Limiting ring; 71. Limiting boss;

[0029] 8. Second screw;

[0030] 9. Photoelectric sensor. DETAILED DESCRIPTION

[0031] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0032] Please refer to Figures 1 to 6 A transmission mechanism is used to transmit power between a first body and a second body; it includes a pitch shaft 1, one end of which is fixedly connected to the first body, and a worm wheel 2 and a worm 3 rotatably mounted on the second body, the worm wheel 2 and the worm 3 are meshed with each other; the pitch shaft 1 is coaxially arranged with the worm wheel 2, and the end of the pitch shaft 1 away from the first body is fixedly connected with the worm wheel 2; a coupling boss 21 and a coupling groove 11 matching with the coupling boss 21 are respectively provided on the contact surfaces of the pitch shaft 1 and the worm wheel 2.

[0033] From the above description, it can be seen that the beneficial effect of the utility model is that the transmission mechanism integrates the coupling boss 21 and the coupling groove 11 on the turbine and the pitch shaft 1 respectively, thereby avoiding the increase in installation space caused by the setting of the coupling, making its own structure more compact. At the same time, the integrated design also effectively increases the transmission load between the worm gear 2 and the pitch shaft 1.

[0034] Further, the coupling boss 21 is provided on the worm wheel 2 , and the coupling groove 11 is provided on the pitch shaft 1 ; or, the coupling groove 11 is provided on the worm wheel 2 , and the coupling boss 21 is provided on the pitch shaft 1 .

[0035] It can be seen from the above description that the arrangement positions of the coupling boss 21 and the coupling groove 11 can be selected according to actual use.

[0036] Furthermore, there are multiple coupling bosses 21 and multiple coupling grooves 11 , and the multiple coupling bosses 21 and multiple coupling grooves 11 are evenly distributed around the axial direction of the worm gear 2 .

[0037] It can be seen from the above description that the uniform distribution of the plurality of coupling bosses 21 and coupling grooves 11 around the axial direction of the worm gear 2 is conducive to more uniform transmission of torque.

[0038] Furthermore, it also includes a first screw 4 , and the worm gear 2 and the pitch axis 1 are fixedly connected via the first screw 4 .

[0039] It can be seen from the above description that the connection method between the worm gear 2 and the pitch axis 1 is simple and stable.

[0040] Furthermore, there are multiple first screws 4 , and the multiple first screws 4 are evenly distributed around the axial direction of the worm gear 2 .

[0041] Furthermore, it also includes a fixing sleeve 5 , which is fixedly mounted on the second main body. At least one bearing 6 is provided in the fixing sleeve 5 , and the pitch axis 1 passes through the bearing 6 .

[0042] It can be seen from the above description that the bearing 6 is provided to support the pitch axis 1 and reduce the friction between the pitch axis 1 and the second body, so that the pitch axis 1 can rotate more smoothly.

[0043] Furthermore, it also includes a limiting ring 7. An annular limiting shoulder 51 is provided in the fixing sleeve 5. The limiting ring 7 is detachably installed on one end of the fixing sleeve 5. An annular groove for accommodating the bearing 6 is formed between the limiting ring 7 and the limiting shoulder 51.

[0044] It can be seen from the above description that the bearing 6 is simple to install and easy to assemble and disassemble.

[0045] Furthermore, at least one limiting boss 71 is provided on one side of the limiting ring 7 close to the worm gear 2 , and a limiting protrusion 22 is provided on one end face of the worm gear 2 close to the limiting ring 7 , and the limiting boss 71 is used to abut against the limiting protrusion 22 .

[0046] It can be seen from the above description that the limiting ring 7 can limit the rotational stroke of the worm gear 2 through the limiting boss 71 , thereby limiting the rotational stroke of the pitch axis 1 .

[0047] Furthermore, it also includes a second screw 8 , and the limiting ring 7 and the fixing sleeve 5 are fixedly connected via the second screw 8 .

[0048] It can be seen from the above description that the connection method between the limiting ring 7 and the fixing sleeve 5 is simple and stable.

[0049] Furthermore, it also includes a photoelectric sensor 9 , which is fixedly connected to the second body, and a triggering member 23 is provided on the worm gear 2 corresponding to the photoelectric sensor 9 .

[0050] It can be seen from the above description that the photoelectric sensor 9 cooperates with the trigger member 23 to record the initial position of the worm gear 2, thereby limiting the extreme position of the worm gear 2 rotating in a certain direction.

[0051] Please refer to Figures 1 to 6The first embodiment of the utility model is: a transmission mechanism for transmitting power between a first body and a second body. In this embodiment, the first body is a camera compartment, and the second body is a camera seat cavity.

[0052] The transmission mechanism includes a pitch shaft 1 fixedly connected to the first body at one end, and a worm wheel 2 and a worm 3 rotatably mounted on the second body, the worm wheel 2 and the worm 3 are meshed, and the worm 3 is fixedly connected to the output shaft of the rotating drive member on the second body; the pitch shaft 1 is coaxially arranged with the worm wheel 2, and the end of the pitch shaft 1 away from the first body is fixedly connected with the worm wheel 2; the contact surfaces of the pitch shaft 1 and the worm wheel 2 are respectively provided with a coupling boss 21 and a coupling groove 11 matched with the coupling boss 21. Specifically, the number of coupling bosses 21 and coupling grooves 11 is set one by one. The coupling boss 21 is in the shape of a rectangular body, and the coupling groove 11 is adapted to the shape of the coupling boss 21. In this embodiment, a coupling boss 21 is provided on the worm wheel 2, and a coupling groove 11 is provided on the pitch shaft 1. The worm wheel 2 and the coupling boss 21 are an integral structure formed in one piece, and the coupling groove 11 and the pitch shaft 1 are an integral structure formed in one piece. In other embodiments, it is also feasible that the worm wheel 2 is provided with a coupling groove 11, and the pitch shaft 1 is provided with a coupling boss 21; or, it is also feasible that both the worm wheel 2 and the pitch shaft 1 are provided with a coupling boss 21 and a coupling groove 11.

[0053] like Figure 4 and Figure 5 As shown, the number of coupling bosses 21 and coupling grooves 11 is multiple, and the multiple coupling bosses 21 and coupling grooves 11 are evenly distributed around the axial direction of the worm wheel 2. In this embodiment, the number of coupling bosses 21 and coupling grooves 11 is four.

[0054] like Figure 4 As shown, the transmission mechanism further includes a first screw 4, and the worm wheel 2 is fixedly connected to the pitch axis 1 through the first screw 4. There are multiple first screws 4, and the multiple first screws 4 are evenly distributed around the axial direction of the worm wheel 2. In this embodiment, there are four first screws 4, and the first screws 4 and the coupling boss 21 are arranged at intervals around the axial direction of the worm wheel 2.

[0055] like Figure 3 and Figure 6 As shown, the transmission mechanism further includes a fixed sleeve 5, which is fixedly mounted on the second body, and at least one bearing 6 is arranged in the fixed sleeve 5, and the pitch axis 1 passes through the bearing 6. Specifically, the second body is provided with an assembly hole connecting the inner cavity and the outside, and the fixed sleeve 5 is arranged in the assembly hole, and the fixed sleeve 5 is connected and fixed to the second body by screws. There are two bearings 6, and the two bearings 6 are arranged at intervals along the axial direction of the fixed sleeve 5.

[0056] like Figure 3 and Figure 6 As shown, the transmission mechanism further includes a limiting ring 7 and a second screw 8, an annular limiting shoulder 51 is provided in the fixed sleeve 5, the limiting ring 7 is detachably mounted on one end of the fixed sleeve 5 by the second screw 8, and an annular groove for accommodating the bearing 6 is formed between the limiting ring 7 and the limiting shoulder 51. Specifically, there are two limiting rings 7, and the two limiting rings 7 are connected to both ends of the fixed sleeve 5 respectively.

[0057] like Figure 2 and Figure 4 As shown, the transmission mechanism further includes a photoelectric sensor 9, which is fixedly connected to the second body, and a trigger 23 is provided on the worm gear 2 corresponding to the photoelectric sensor 9. Specifically, the photoelectric sensor 9 is fixedly connected to the fixed sleeve 5. The photoelectric sensor 9 cooperates with the trigger 23 to record the initial position of the worm gear 2, thereby limiting the extreme position of the worm gear 2 rotating in a certain direction.

[0058] Further, such as Figure 4 and Figure 6 As shown, at least one limiting boss 71 is provided on one side of the limiting ring 7 close to the worm wheel 2, and a limiting convex block 22 is provided on one end face of the worm wheel 2 close to the limiting ring 7, and the limiting boss 71 is used to abut against the limiting convex block 22. In this embodiment, there are two limiting bosses 71, and the two limiting bosses 71 are respectively used to abut against the two side faces of the limiting convex block 22, thereby limiting the rotation stroke of the limiting convex block 22. It is easy to understand that the limiting ring 7 can mechanically limit the rotation stroke of the worm wheel 2 through the limiting boss 71, thereby limiting the rotation stroke of the pitch axis 1, and avoiding the over-travel of the worm wheel 2 and the pitch axis 1 due to the failure of the photoelectric sensor 9.

[0059] In summary, the transmission mechanism provided by the utility model integrates the coupling boss and the coupling groove on the turbine and the pitch shaft respectively, thereby avoiding the result of increasing the installation space due to the setting of the coupling, making the structure more compact. At the same time, the integrated design also effectively increases the transmission load between the worm gear and the pitch shaft. The limit ring can limit the rotation stroke of the worm gear through the limit boss, thereby limiting the rotation stroke of the pitch shaft. The photoelectric sensor cooperates with the trigger member to record the initial position of the worm gear, thereby limiting the extreme position of the worm gear rotating in a certain direction.

[0060] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A transmission mechanism for transmitting power between a first body and a second body; characterized in that: It includes a pitch axis with one end fixedly connected to the first body, and a worm wheel and a worm gear rotatably mounted on the second body, the worm wheel and the worm gear being meshed with each other; the pitch axis is coaxially arranged with the worm wheel, and the end of the pitch axis away from the first body is fixedly connected to the worm wheel; a coupling boss and a coupling groove cooperating with the coupling boss are respectively provided on the contact surfaces of the pitch axis and the worm wheel.

2. The transmission mechanism according to claim 1, characterized in that: The coupling boss is provided on the worm wheel, and the coupling groove is provided on the pitch shaft; or, the coupling groove is provided on the worm wheel, and the coupling boss is provided on the pitch shaft.

3. The transmission mechanism according to claim 1, characterized in that: The number of the coupling bosses and coupling grooves is multiple, and the multiple coupling bosses and coupling grooves are evenly distributed around the axial direction of the worm wheel.

4. The transmission mechanism according to claim 1, characterized in that: It also includes a first screw, and the worm gear is fixedly connected to the pitch axis through the first screw.

5. The transmission mechanism according to claim 4, characterized in that: There are multiple first screws, and the multiple first screws are evenly distributed around the axial direction of the worm wheel.

6. The transmission mechanism according to claim 1, characterized in that: It also includes a fixing sleeve, which is fixedly installed on the second main body. At least one bearing is arranged in the fixing sleeve, and the pitch axis passes through the bearing.

7. The transmission mechanism according to claim 6, characterized in that: It also includes a limiting ring. An annular limiting shoulder is arranged in the fixing sleeve. The limiting ring is detachably mounted on one end of the fixing sleeve. An annular groove for accommodating the bearing is formed between the limiting ring and the limiting shoulder.

8. The transmission mechanism according to claim 7, characterized in that: At least one limiting boss is provided on a side of the limiting ring close to the worm wheel, and a limiting convex block is provided on an end surface of the worm wheel close to the limiting ring, and the limiting boss is used to abut against the limiting convex block.

9. The transmission mechanism according to claim 7, characterized in that: It also includes a second screw, and the limiting ring and the fixing sleeve are fixedly connected by the second screw.

10. The transmission mechanism according to claim 1, characterized in that: It also includes a photoelectric sensor, which is fixedly connected to the second body, and a triggering member is provided on the worm gear corresponding to the photoelectric sensor.

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