Transmission assembly and actuator

Abstract

The transmission assembly is reliable in operation and convenient to use and comprises a pivoting piece and a transmission piece which are coaxially arranged, the front end of the transmission piece extends into an inner hole of the pivoting piece, the transmission piece is provided with a C-shaped clamping spring in a hooping mode, and the C-shaped clamping spring is connected with the pivoting piece in a hooping mode. The notch of the C-shaped clamp spring is matched with the stop block on the pivoting piece; the relative rotation of the transmission piece and the pivoting piece is limited by the pre-tightening effect of the C-shaped clamp spring; a one-way limiting structure is arranged on the transmission part and abuts against the pivoting part, and the one-way limiting structure and the C-shaped clamping spring jointly limit rotation of the transmission part in the first direction. When the one-way limiting structure is separated from the pivoting piece, the transmission piece rotates in the second direction; the utility model relates to the technical field of automobile parts.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and more specifically to transmission components and actuators. Background Technology

[0002] Automobiles are generally equipped with door assembly structures (such as charging doors or refueling doors); door assemblies are usually movable (e.g., rotating connections, or driven by motors through transmission components) to realize the function of opening or closing the door assembly.

[0003] The door assembly is driven by a motor through a transmission component. The transmission component is equipped with a two-way clutch (such as a C-shaped snap ring) as a torque transmission element. The force of the C-shaped snap ring enables the two to engage and transmit power.

[0004] When in use, the user can press the door assembly, and after the C-shaped spring expands, it loses its friction limiting function, thus enabling the door assembly to be closed manually (push to run function).

[0005] Alternatively, in an emergency, the door assembly can be forcibly rotated. Once the C-shaped retaining spring expands and loses its friction limiting function, the door assembly can be rotated and opened (emergency opening function).

[0006] A C-shaped snap ring acts as a two-way clutch, enabling both push-to-run and emergency opening functions.

[0007] However, there is a problem in the market: when a vehicle is traveling at high speed, the door assembly overcomes the friction of the C-shaped retaining spring due to inertia and wind force, causing the door assembly to open.

[0008] Increasing the C-type friction will reduce the failure rate, but the push-to-run function will be weakened or even lost, because the greater the C-type friction, the greater the external pushing force required, which will prevent the user from using it normally. Utility Model Content

[0009] To address the shortcomings and defects of existing technologies, a reliable and easy-to-use transmission component and an actuator using the transmission component are provided.

[0010] A transmission assembly, comprising:

[0011] A pivot and a transmission are coaxially arranged, the front end of the transmission extends into the inner hole of the pivot, the transmission is fitted with a C-shaped retaining ring, and the notch of the C-shaped retaining ring matches the stop block on the pivot;

[0012] The preload of the C-type retaining ring drives the rotation of the transmission component and the pivot component in a linked manner. When the relative rotation tendency overcomes the preload of the C-type retaining ring, the pivot component or the transmission component can rotate relative to each other.

[0013] A one-way limiting structure is installed between the transmission component and the pivot component.

[0014] When the pivot rotates in the first direction, or the transmission rotates in the opposite second direction, the engagement force between the pivot and the transmission increases;

[0015] When the pivot rotates in the second direction or the transmission rotates in the first direction, the one-way limiting structure disengages from the pivot and the transmission without generating additional resistance. It can rotate relative to the pivot only by overcoming the preload of the C-type snap ring.

[0016] With the above structure, the transmission component of this utility model has the following advantages compared with the prior art: the pivot can be driven to rotate by a worm motor or a worm wheel, and the worm wheel meshes with the worm (which can lock the pivot so that it cannot rotate when stopped).

[0017] The transmission component can be connected to the required parts (e.g., the rotation of parts such as the car charging door and the car refueling door);

[0018] If it is necessary to make the transmission component rotate in the first direction

[0019] First, the pivot is driven to rotate in the first direction. The one-way limiting structure, combined with the C-shaped snap ring, forms a structure similar to a linkage shaft between the pivot and the transmission components. It can transmit a large torque, which enables the transmission components to drive the parts to move more easily.

[0020] If manual control of the components to perform the opposite action is required, human force can be applied to the components to make the transmission component rotate in the first direction. At this time, the one-way limiting structure disengages between the pivot and the transmission component. The transmission component only needs to overcome the preload of the C-shaped retaining spring to rotate. The required rotational torque is small, and rotation can be achieved relatively easily.

[0021] As an improvement of this utility model, the one-way limiting structure is a roller, the transmission component is provided with a cam groove on its periphery, the roller is disposed in the cam groove, the cam groove is configured to gradually decrease in depth along the first direction and gradually increase in depth along the second direction.

[0022] The roller is movably connected in the cam groove. The roller travels in the cam groove to the side with a smaller groove depth, and the roller part protrudes from the opening of the cam groove and abuts against the inner hole wall.

[0023] The roller travels within the cam groove to the side with the greater groove depth, where the roller slides into the inner bore.

[0024] As an improvement of this utility model, a spring is provided in the cam groove. One end of the spring stops at the tail end of the cam groove, and the other end stops at the roller, causing the roller to always have a tendency to move towards the side with a smaller groove depth.

[0025] As an improvement of this utility model, the number of cam grooves is at least two, and the cam grooves are arranged at intervals along the circumference of the transmission component. Each cam groove is independently provided with a roller and a spring that cooperates with and abuts against it.

[0026] As an improvement of this utility model, the front end of the transmission component is provided with a forward-extending connecting part, and the C-shaped snap ring is provided on the periphery of the connecting part;

[0027] The stop block is set on the bottom wall of the inner hole.

[0028] As an improvement of this utility model, the unidirectional limiting structure and the C-type snap ring are arranged on the transmission component at intervals along the axial direction of the transmission component.

[0029] As an improvement of this utility model, the one-way limiting structure is a one-way bearing, which is disposed between the inner hole and the outer circumference of the transmission component, and the outer ring is fixedly connected to the inner hole, and the inner ring is fixedly connected to the transmission component.

[0030] An actuator employs a transmission component as described in any one of the above, comprising a motor, a worm gear drivenly connected to the output end of the motor, a worm wheel meshing with the worm gear, a first transmission gear coaxially disposed on the worm wheel, a first gear ring disposed on a pivot member, the first gear ring meshing with the first transmission gear, a second transmission gear coaxially disposed on the transmission member, the second transmission gear meshing with an output gear, and the output gear being drivenly connected to the rotating shaft of a door assembly.

[0031] An actuator employs the aforementioned transmission assembly, wherein the transmission component has a coaxial output end, and the output end is drively connected to a door assembly.

[0032] The pivot member is provided with a second gear ring, which meshes with a third transmission gear. The third transmission gear is provided with a coaxial fourth transmission gear, which meshes with a fifth transmission gear. The fifth transmission gear is provided with a coaxial sixth transmission gear, which meshes with a seventh transmission gear. The seventh transmission gear is provided with a coaxial eighth transmission gear, which meshes with a worm gear. The worm gear is connected to the output end of the motor.

[0033] With the above structure, the actuator of this utility model has the following advantages compared with the prior art:

[0034] If the pivot is driven to rotate in the first direction, the one-way limiting structure combined with the C-type snap ring will form a structure similar to a linkage shaft between the pivot and the transmission component, which can make the torque transmitted by the transmission component large. The transmission component drives the output gear to rotate through the second gear ring (or the transmission component and the output end rotate synchronously). The rotation of the output gear (output end) can drive the door component to perform corresponding actions through the rotation of the door component (e.g., opening of parts such as car charging door, car refueling door, etc.). For example, when ice forms on the surface of the door component and the door component needs to be opened electrically, the large opening torque of the door component can break the ice and open the door component more easily.

[0035] If the pivot is driven to rotate in the second direction, the preload of the C-type retaining ring can drive the transmission component to rotate in the same direction. The transmission component drives the output gear to rotate through the second gear ring (or the transmission component rotates synchronously with the output end). The rotation of the output gear (output end) can drive the door assembly to perform corresponding actions through the rotation of the door assembly (e.g., closing of components such as car charging door, car refueling door, etc.).

[0036] During operation, if the door assembly is subjected to force that tends to open, the transmission component needs to rotate in the second direction, and the pivot component is locked by the transmission structure of the worm gear and worm.

[0037] The transmission component needs to overcome the binding force of the one-way limiting structure and the preload of the C-type retaining ring in order to rotate. The transmission component requires a large torque, so it cannot be rotated easily, and the door assembly cannot be opened, always remaining in a closed state, which greatly improves the reliability of operation.

[0038] When it is necessary to manually open the door assembly, the door assembly can be opened by forcefully prying it and overcoming the opposing force of the one-way limiting structure and the preload of the C-shaped retaining spring.

[0039] When the door assembly needs to be closed manually, the user presses the door assembly, and the transmission component rotates in the first direction. The transmission component only needs to overcome the preload of the C-shaped retaining spring to rotate. The required torque of the transmission component is small, and the door assembly can be closed relatively easily by rotating it.

[0040] In this solution, either rollers or one-way bearings can achieve the same functional effect in the one-way limiting structure.

[0041] As an improvement of this utility model, it also includes an encoder, wherein the input shaft of the encoder is coaxially connected with the output gear. Attached Figure Description

[0042] Figure 1This is a schematic diagram of the first embodiment of the unidirectional limiting structure of this utility model.

[0043] Figure 2 This is a schematic diagram of the components of the first embodiment of the unidirectional limiting structure of this utility model under an explosive state.

[0044] Figure 3 This is a half-sectional schematic diagram of the first embodiment of the unidirectional limiting structure of this utility model.

[0045] Figure 4 This is a schematic diagram of the movement direction of the first embodiment of the unidirectional limiting structure of this utility model.

[0046] Figure 5 This is a partial cross-sectional schematic diagram of the first embodiment of the unidirectional limiting structure of this utility model.

[0047] Figure 6 This is a schematic diagram of the actuator of the present invention, which adopts the unidirectional limiting structure of the first embodiment.

[0048] Figure 7 This is a schematic diagram of the second embodiment of the unidirectional limiting structure of this utility model.

[0049] Figure 8 This is the utility model Figure 7 A schematic diagram of the structure of the components in an explosive state.

[0050] Figure 9 This is a schematic diagram of the actuator of the present invention, which adopts the unidirectional limiting structure of the second embodiment.

[0051] Figure 10 This is a cross-sectional view of the actuator of the present invention, which adopts the unidirectional limiting structure of the second embodiment.

[0052] The figure shows: 1. Pivot component; 1.1. Inner hole; 1.1.1. Stop block; 1.2. First gear ring; 1.3. Second gear ring; 2. Transmission component; 2.1. Cam groove; 2.2. Connecting part; 2.3. Output end; 3. C-type snap ring; 4. One-way limiting structure; 4.1. Roller; 4.2. One-way bearing; 5. Spring; 6. Motor; 6.1. Worm gear; 6.2. Worm wheel; 7. First transmission gear; 8. Second transmission gear; 9. Output gear; 10. Encoder; 11. Third transmission gear; 12. Fourth transmission gear; 13. Fifth transmission gear; 14. Sixth transmission gear; 15. Seventh transmission gear; 16. Eighth transmission gear; Detailed Implementation

[0053] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0054] Please see Figure 1 , Figure 2 , Figure 4 , Figure 7 , Figure 8 As shown,

[0055] A transmission assembly, comprising:

[0056] A pivot 1 and a transmission 2 are coaxially arranged. The front end of the transmission 2 extends into the inner hole 1.1 of the pivot 1. The transmission 2 is clamped with a C-shaped retaining ring 3, and the notch of the C-shaped retaining ring 3 matches the stop block 1.11 on the pivot 1.

[0057] The preload of the C-type snap ring 3 drives the transmission component 2 and the pivot component 1 to rotate in linkage. When the relative rotation trend overcomes the preload of the C-type snap ring 3 (the C-type snap ring 3 expands under force and loses contact with the circumference of the transmission component 2, thus losing its preload effect), the pivot component 1 or the transmission component 2 can rotate relative to each other.

[0058] One-way limiting structure 4 is installed between transmission component 2 and pivot component 1.

[0059] When the pivot 1 rotates in the first direction, or the transmission 2 rotates in the opposite second direction, the bonding force between the pivot 1 and the transmission 2 is increased.

[0060] When the pivot 1 rotates in the second direction, or the transmission 2 rotates in the first direction, the one-way limiting structure 4 disengages from the pivot 1 and the transmission 2, and can rotate relative to each other by overcoming the preload of the C-type snap ring 3.

[0061] The pivot 1 can be driven to rotate by the worm 6.1 motor 6 or the worm wheel 6.2. The worm wheel 6.2 is engaged with the worm 6.1 (which can lock the pivot 1 so that it cannot rotate when it is stopped).

[0062] The transmission component 2 can be connected to the required components (e.g., the rotation of components such as the car charging door and the car refueling door);

[0063] If it is necessary to rotate the transmission component 2 in the first direction

[0064] First, the pivot 1 is driven to rotate in the first direction. The one-way limiting structure 4, combined with the C-shaped snap ring 3, forms a structure similar to a linkage shaft between the pivot 1 and the transmission component 2. It can transmit a large torque, which enables the transmission component 2 to drive the components to move more easily.

[0065] If manual control of the components to perform the opposite action is required, human force can be applied to the components to make the transmission component 2 rotate in the first direction. At this time, the one-way limiting structure 4 disengages between the pivot component 1 and the transmission component 2. The transmission component 2 only needs to overcome the preload of the C-type retaining spring 3 to rotate. The required rotational torque is small, and rotation can be achieved relatively easily.

[0066] Please see Figure 1-5 As shown, this is the first embodiment of the one-way limiting structure 4 of this application. The one-way limiting structure 4 is a roller 4.1. The transmission member 2 is provided with a cam groove 2.1 on its periphery. The roller 4.1 is disposed in the cam groove 2.1. The cam groove 2.1 is configured to gradually decrease in groove depth along the first direction and gradually increase in groove depth along the second direction.

[0067] The roller 4.1 is movably connected in the cam groove 2.1. The roller 4.1 travels in the cam groove 2.1 to the side with a smaller groove depth. Part of the roller 4.1 protrudes from the opening of the cam groove 2.1 and abuts against the wall of the inner hole 1.1.

[0068] The roller 4.1 travels within the cam groove 2.1 to the side with the greater groove depth, and the roller 4.1 slides into the inner hole 1.1.

[0069] After the above improvements, roller 4.1 is used as the one-way limiting structure 4, and roller 4.1 is set to move within the cam groove 2.1.

[0070] When the pivot 1 rotates in the first direction, or the transmission 2 rotates in the opposite second direction, the roller 4.1 can travel to the side with the smaller groove depth in the cam groove 2.1. At this time, the bottom wall of the cam groove 2.1 pushes the roller 4.1 outward, and part of the roller 4.1 protrudes from the opening of the cam groove 2.1 (forming a cam-like structure with the circumference of the transmission 2). The protruding part of the roller 4.1 abuts against the wall of the inner hole 1.1, thereby increasing the bonding force between the transmission 2 and the pivot 1.

[0071] When the pivot 1 rotates in the second direction or the transmission 2 rotates in the first direction, the roller 4.1 enters the side with a deeper groove depth. The roller 4.1 cannot effectively abut against the wall of the inner hole 1.1, thereby reducing the bonding force between the transmission 2 and the pivot 1.

[0072] Please see Figure 1-5 As shown, a spring 5 is provided in the cam groove 2.1. One end of the spring 5 is stopped at the tail end of the cam groove 2.1, and the other end is stopped at the roller 4.1, causing the roller 4.1 to always tend to move towards the side with a smaller groove depth.

[0073] After the above improvements, the tail end of the cam groove 2.1 is provided with an assembly hole. The tail end of the spring 5 is inserted into the assembly hole, and the front end protrudes from the assembly hole and abuts against the roller 4.1. The preload of the spring 5 drives the roller 4.1 to always tend to move towards the side with a smaller groove depth, which can improve the reliability of the fit and make the device operate stably and reliably.

[0074] Please see Figure 1-5 As shown, there are at least two cam grooves 2.1. The cam grooves 2.1 are arranged at intervals along the circumference of the transmission member 2. Each cam groove 2.1 is independently provided with a roller 4.1 and a spring 5 that cooperates with it.

[0075] After the above improvements, the multiple rollers 4.1 and springs 5 ​​distributed circumferentially have multiple points of action that abut against the inner hole 1.1 in the circumferential direction of the transmission component 2, which increases the force after abutment and further improves the reliability of operation.

[0076] Please see Figure 1-5 As shown, the front end of the transmission component 2 is provided with a forward-extending connecting part 2.2, the C-shaped snap ring 3 is clamped around the connecting part 2.2, and the stop block 1.11 is provided on the bottom wall of the inner hole 1.1.

[0077] Specifically, the front end of the transmission component 2 is provided with a connecting part 2.2, and a C-shaped retaining spring 3 is clamped onto the connecting part 2.2. A certain gap is formed between the main body of the transmission component 2 and the inner hole 1.1, and the diameter of the connecting part 2.2 is also smaller than the diameter of the main body of the transmission component 2. The gap reserved between the circumference of the connecting part 2.2 and the inner hole 1.1 allows the C-shaped retaining spring 3 to deform, thereby effectively disengaging the C-shaped retaining spring 3 from the connecting part 2.2. The transmission component 2 can rotate independently relative to the pivot component 1. After the above improvements, it has the characteristics of simple structure, reasonable layout, and stable and reliable operation.

[0078] Preferably, the unidirectional limiting structure 4 and the C-type retaining ring 3 are arranged on the transmission component 2 at intervals along the axial direction of the transmission component 2. This improvement results in a reasonable structural layout and reliable operation.

[0079] Please see the appendix. Figure 7-8 This is the second embodiment of the one-way limiting structure 4 in this application. The one-way limiting structure 4 is a one-way bearing 4.2. The one-way bearing 4.2 is disposed between the inner hole 1.1 and the outer periphery of the transmission member 2, and the outer ring is fixedly connected to the inner hole 1.1 and the inner ring is fixedly connected to the transmission member 2.

[0080] For the specific principle of the one-way bearing 4.2, please refer to the announcement number CN207246281U. The one-way bearing 4.2 announced can also achieve the same function as the first embodiment of the one-way limiting structure 4 when installed in the above-mentioned structural arrangement.

[0081] Please see Figure 6 An actuator, employing a transmission component of the first embodiment of the aforementioned one-way limiting structure 4, includes a motor 6. The output end 2.3 of the motor 6 is connected to a worm gear 6.1 via a worm 6.1, and the worm gear 6.1 is meshed with a worm wheel 6.2.

[0082] The worm gear 6.2 is connected to the transmission component 2 via a gear structure.

[0083] The gear structure includes: a first transmission gear 7, which is coaxially arranged with the worm gear 6.2.

[0084] The first gear ring 1.2 is mounted on the pivot member 1 and meshes with the first transmission gear 7.

[0085] The second transmission gear 8 is coaxially arranged with the transmission component 2, and the second transmission gear 8 is meshed with the output gear 9.

[0086] The output gear 9 is connected to the rotating shaft of the door assembly.

[0087] Please see the appendix Figure 9-10 An actuator, employing a transmission component of the second embodiment of the aforementioned one-way limiting structure 4,

[0088] The transmission component 2 is provided with a coaxial output end 2.3, which is connected to the door assembly in a transmission manner.

[0089] The pivot member 1 is provided with a second gear ring 1.3, which is meshed with a third transmission gear 11. The third transmission gear 11 is provided with a coaxial fourth transmission gear 12. The fourth transmission gear 12 is meshed with a fifth transmission gear 13. The fifth transmission gear 13 is provided with a coaxial sixth transmission gear 14. The sixth transmission gear 14 is meshed with a seventh transmission gear 15. The seventh transmission gear 15 is provided with a coaxial eighth transmission gear 16. The eighth transmission gear 16 is meshed with a worm gear 6.1, which is connected to the output end 2.3 of the motor 6.

[0090] After the motor 6 rotates, it can drive the pivot 1 to rotate through the transmission structure of "worm 6.1 and worm wheel 6.2". When it stops rotating, the transmission structure of "worm 6.1 and worm wheel 6.2" can self-lock.

[0091] If the pivot 1 is driven to rotate in the first direction, the one-way limiting structure 4, combined with the C-shaped retaining ring 3, forms a structure similar to a linkage shaft between the pivot 1 and the transmission 2, which can make the torque transmitted by the transmission 2 large. The transmission 2 drives the output gear 9 to rotate through the second gear ring 1.3. The rotation of the output gear 9 can drive the door assembly to perform corresponding actions through the rotation of the door assembly (e.g., opening of parts such as the car charging door and the car refueling door). For example, when ice forms on the surface of the door assembly and the door assembly needs to be opened electrically, the large opening torque of the door assembly can break the ice and open the door assembly more easily.

[0092] If the pivot 1 is driven to rotate in the second direction, the preload of the C-type retaining ring 3 can drive the transmission 2 to rotate in the same direction. The transmission 2 drives the output gear 9 to rotate through the second gear ring 1.3. The rotation of the output gear 9 can drive the door assembly to perform corresponding actions (e.g., closing of components such as the car charging door and the car refueling door).

[0093] During operation, if the door assembly is subjected to force that tends to open, the transmission component 2 needs to rotate in the second direction, and the pivot component 1 is locked by the transmission structure of the worm gear 6.2 and the worm 6.1.

[0094] The transmission component 2 needs to overcome the binding force of the one-way limiting structure 4 and the preload force of the C-type retaining ring 3 in order to rotate. The transmission component 2 requires a large torque, so it cannot be rotated easily, and the door assembly cannot be opened. It is always in a closed state, which greatly improves the reliability of operation.

[0095] When it is necessary to manually open the door assembly, the door assembly can be opened by forcefully prying it and overcoming the opposing force of the one-way limiting structure 4 and the preload of the C-type retaining spring 3.

[0096] When the door assembly needs to be closed manually, the user presses the door assembly, and the transmission component 2 rotates in the first direction. The transmission component 2 only needs to overcome the preload of the C-shaped retaining spring 3 to rotate. The required torque of the transmission component 2 is small, and the door assembly can be closed relatively easily by rotating it.

[0097] In this solution, the one-way limiting structure 4 can achieve the same functional effect by using either a roller 4.1 or a one-way bearing 4.2.

[0098] Please see Figure 6As shown, it also includes an encoder 10, whose input shaft and output gear 9 are coaxially connected. The encoder 10 can be electrically connected to the motor 6. When the user pries open or presses the door assembly, the door assembly's rotating shaft drives the output gear 9 to rotate. The rotation of the output gear 9 can drive the input shaft of the encoder 10 to rotate. The encoder 10 can obtain rotation data when the input shaft rotates. After reaching the preset rotation data, it can send a signal to the motor 6. At this time, the motor 6 intervenes to control the rotation of the output terminal 2.3, thereby causing the door assembly to perform the corresponding action.

[0099] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A transmission assembly characterized by, include: A pivot (1) and a transmission (2) are coaxially arranged. The front end of the transmission (2) extends into the inner hole (1.1) of the pivot (1). The transmission (2) is fitted with a C-shaped retaining ring (3), and the notch of the C-shaped retaining ring (3) matches the stop block (1.11) on the pivot (1). The preload of the C-type snap ring (3) drives the transmission component (2) and the pivot component (1) to rotate in linkage. When the relative rotation tendency overcomes the preload of the C-type snap ring (3), the pivot component (1) or the transmission component (2) can rotate relative to each other. A one-way limiting structure (4) is set between the transmission member (2) and the pivot member (1). When the pivot member (1) rotates in the first direction or the transmission member (2) rotates in the opposite second direction, the connecting force between the pivot member (1) and the transmission member (2) is increased. When the pivot (1) rotates in the second direction or the transmission (2) rotates in the first direction, the one-way limiting structure (4) disengages from the pivot (1) and the transmission (2) and can rotate relative to each other by overcoming the preload of the C-type snap ring (3).

2. A transmission assembly according to claim 1, wherein: The one-way limiting structure (4) is a roller (4.1), and the transmission component (2) is provided with a cam groove (2.1) on its periphery. The roller (4.1) is located in the cam groove (2.1). The cam groove (2.1) is configured with a gradually decreasing groove depth along the first direction and a gradually increasing groove depth along the second direction. The roller (4.1) is movably connected in the cam groove (2.1). The roller (4.1) travels in the cam groove (2.1) to the side with a smaller groove depth. Part of the roller (4.1) protrudes from the opening of the cam groove (2.1) and abuts against the wall of the inner hole (1.1). The roller (4.1) travels within the cam groove (2.1) to the side with the greater groove depth, and the roller (4.1) slides into the inner hole (1.1).

3. A transmission assembly according to claim 2, characterized in that: A spring (5) is provided in the cam groove (2.1). One end of the spring (5) is stopped at the tail end of the cam groove (2.1), and the other end is stopped at the roller (4.1), causing the roller (4.1) to always have a tendency to move towards the side with a smaller groove depth.

4. A transmission assembly according to claim 3, characterized in that: The number of cam grooves (2.1) is at least two. The cam grooves (2.1) are arranged circumferentially along the transmission member (2). Each cam groove (2.1) is independently provided with a roller (4.1) and a spring (5) that cooperates with it.

5. A transmission assembly according to claim 1, characterized in that: The one-way limiting structure (4) is a one-way bearing (4.2). The one-way bearing (4.2) is located between the inner hole (1.1) and the outer circumference of the transmission component (2), and the outer ring is fixedly connected to the inner hole (1.1) and the inner ring is fixedly connected to the transmission component (2).

6. An actuator employing a transmission assembly as described in any one of claims 2-4, characterized in that: The device includes a motor (6), the output end of which is connected to a worm gear (6.1), the worm gear (6.1) is meshed with a worm wheel (6.2), the worm wheel (6.2) is connected to a transmission component (2) through a gear structure, and the transmission component (2) is connected to the rotating shaft of the door assembly.

7. An actuator employing a transmission assembly as described in claim 5, characterized in that: The transmission component (2) is provided with a coaxial output end (2.3), which is connected to the door assembly in a transmission manner. The pivot (1) is connected to the worm (6.1) via a transmission, and the worm (6.1) is driven to rotate by the motor (6).

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