Torsional spring damping actuator for small charging door of automobile

Abstract

The utility model discloses an automobile charging small door torsional spring damping actuator which comprises a motor, a damping gear set arranged on a torque transmission path and an output assembly arranged at the tail end of the torque transmission path, and the damping gear set comprises a first transmission gear and a second transmission gear. The damping torsional spring is arranged between the first transmission gear and the second transmission gear, the damping torsional spring is fixedly connected with the first transmission gear and is in interference fit with the second transmission gear, one of the first transmission gear and the second transmission gear receives torque from the motor, and the other one receives torque from the motor. The other one of the first transmission gear and the second transmission gear outputs torque towards the output assembly; the damping torsion spring further cooperates towards the second transmission gear under the action of the opening actuating force, or the damping torsion spring generates a change in a second radial direction under the action of the closing actuating force, and the second radial direction is opposite to the first radial direction and deviates from the direction of cooperation with the second transmission gear.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a torsion spring damping actuator for a car charging door. Background Technology

[0002] Currently, the electronic actuators used in the market are applied to vehicle components that can be manually operated by the user, such as electric gates. The actuators typically include a motor and a gear transmission device connected to the motor.

[0003] In a prior art vehicle actuator, a clutch device is incorporated into the gear transmission to enable transmission clutch engagement in the event of power failure. This clutch device typically consists of two axially engaged concave-convex components. When excessive torque is applied, the two concave-convex components can axially separate, thus disengaging the transmission. However, it also includes an elastic element that returns the two concave-convex components to their reset state. This elastic element causes the two concave-convex components to return to the engaged state after separation. With the continuous application of high torque, the two concave-convex components produce a "clicking" noise.

[0004] The existing technology disclosed in CN118066226A is a drive device for a rotating part of a motor vehicle. It provides different feel for the user when manually opening or closing the door by setting two clutches inside and setting the slip torque of each clutch. At the same time, it also needs to set a one-way transmission component to ensure that the clutch with the smaller slip torque is isolated when the small door is opened. The structure is relatively complex and not conducive to mass production. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a torsion spring damping actuator for the small door of an automobile charging station.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a torsion spring damping actuator for a car charging door, comprising:

[0007] The motor, a damping gear set disposed on the torque transmission path, and an output component disposed at the end of the torque transmission path, the damping gear set comprising:

[0008] A first transmission gear and a second transmission gear are coaxially arranged, and a damping torsion spring is disposed between the first transmission gear and the second transmission gear. The damping torsion spring is fixedly connected to the first transmission gear and is interference-fitted with the second transmission gear. One of the first transmission gear and the second transmission gear receives torque from the motor, and the other of the first transmission gear and the second transmission gear outputs torque toward the output component.

[0009] The damping torsion spring undergoes a first radial change when the actuation force is applied, and further engages with the second transmission gear; or the damping torsion spring undergoes a second radial change when the actuation force is applied, the second radial change being opposite to the first radial change and deviating from the engagement direction with the second transmission gear.

[0010] Furthermore, the damping torsion spring in the interference state receives motor torque and has a predetermined limit opening torque and limit closing torque, wherein the limit opening torque is greater than the limit closing torque.

[0011] Furthermore, the output component receives an opening actuation force from the outside that transmits a strong opening torque greater than the limit opening torque, and the second transmission gear slips relative to the damping torsion spring under the strong opening torque.

[0012] The output component receives a closing actuation force from the outside that transmits a push-close torque greater than the ultimate closing torque. The forced opening torque is greater than the push-close torque, and the second transmission gear slips relative to the damping torsion spring under the push-close torque.

[0013] Furthermore, a mounting cavity for accommodating a damping torsion spring is provided between the first transmission gear and the second transmission gear, the mounting cavity being defined in the portion where the first transmission gear and the second transmission gear overlap in the axial direction.

[0014] Furthermore, one end of the damping torsion spring has a fixed end extending axially or radially, the first transmission gear is provided with a fixed part for the fixed end to be inserted and engaged, and the second transmission gear is provided with an abutment part supported on the other end of the damping torsion spring.

[0015] Furthermore, the first transmission gear receives torque from the motor, and the first transmission gear has a groove for accommodating the damping torsion spring. The end of the damping torsion spring is fixed in the groove. The second transmission gear has a connecting shaft inserted into and passing through the groove. The damping torsion spring is tightly held on the connecting shaft by an interference fit. Under the action of a strong opening torque or a push-closing torque, the damping torsion spring rubs and slips relative to the connecting shaft.

[0016] Furthermore, the second transmission gear receives torque from the motor, and the second transmission gear has a groove for accommodating a damping torsion spring. The damping torsion spring is pressed against the inner wall of the groove by an interference fit. The first transmission gear has a connecting shaft inserted into and passing through the groove. The end of the damping torsion spring is fixed to the end of the connecting shaft. Under the action of a strong opening torque or a push-closing torque, the damping torsion spring rubs and slips against the inner wall of the groove.

[0017] Furthermore, the second transmission gear receives torque from the motor. The second transmission gear has a groove for accommodating the damping torsion spring and a connecting shaft extending axially within the groove. The damping torsion spring is pressed against the outer wall of the connecting shaft by an interference fit. The first transmission gear has a support portion facing the groove. One end of the damping torsion spring has a fixed end extending radially. The support portion has a fixing part for the fixed end to be inserted. Under the action of a strong opening torque or a push-close torque, the damping torsion spring rubs and slips against the outer wall of the connecting shaft.

[0018] Furthermore, one end of the damping torsion spring extends axially and radially to form a fixed end, the fixed end being inserted into a groove, and the groove having a limiting edge that abuts against one side of the fixed end of the damping torsion spring.

[0019] Furthermore, the actuator is also provided with a circuit board and a potentiometer disposed on the circuit board. The output component includes a coaxially driven output gear and a detection shaft. The output gear meshes with another of the first transmission gear and the second transmission gear. The detection shaft passes through the potentiometer.

[0020] Furthermore, a worm gear is fitted onto the output shaft of the motor, and the worm gear meshes with a double gear, which meshes with either the first transmission gear or the second transmission gear;

[0021] Alternatively, a worm gear is fitted onto the output shaft of the motor, the worm gear meshes with a double gear, the double gear also meshes with a reduction gear, and the reduction gear meshes with one of the first transmission gear or the second transmission gear.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] This utility model uses a damping torsion spring as an intermediate transmission component between the first transmission gear and the second transmission gear. The fixed end of the damping torsion spring is fixed to the first transmission gear, and the damping torsion spring is also pressed against the second transmission gear in an interference fit. Under normal conditions, the motor can transmit torque to the output component through the first transmission gear, the damping torsion spring and the second transmission gear, reducing the number of clutch components, simplifying the structure and reducing the assembly difficulty.

[0024] In the power-off state, the user can apply a strong opening torque greater than the limit opening torque externally, or apply a push closing torque greater than the limit closing torque externally when electrically closing, so that the damping torsion spring can rub and slip relative to the second transmission gear, thereby reducing clutch noise.

[0025] Furthermore, during this process, since the opening torque and the closing torque act on the damping torsion spring in two different directions, the damping torsion spring can provide users with different strong opening and closing feel. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of this utility model after the circuit board has been removed;

[0029] Figure 4 This is a cross-sectional view of the first embodiment of the damping gear set of this utility model;

[0030] Figure 5 This is a schematic diagram of the first transmission gear in a first embodiment of the damping gear set of this utility model;

[0031] Figure 6 This is an exploded view of the first embodiment of the damping gear set of this utility model;

[0032] Figure 7 This is an exploded view from another angle of the first embodiment of the damping gear set of this utility model;

[0033] Figure 8 This is a cross-sectional view of a second embodiment of the damping gear set of this utility model;

[0034] Figure 9 This is an exploded view of a second embodiment of the damping gear set of this utility model;

[0035] Figure 10 This is an exploded view from another angle of the second embodiment of the damping gear set of this utility model;

[0036] Figure 11 This is a cross-sectional view of a third embodiment of the damping gear set of this utility model;

[0037] Figure 12 This is an exploded view of a third embodiment of the damping gear set of this utility model;

[0038] Figure 13 This is an exploded view from another angle of the third embodiment of the damping gear set of this utility model;

[0039] Figure 14 This is a schematic diagram showing the connection between the controller and the potentiometer of this utility model;

[0040] In the picture:

[0041] 1. Motor; 2. Damping gear set; 2.1. First transmission gear; 2.2. Second transmission gear; 2.3. Damping torsion spring; 2.31. Fixed end; 2.4. Mounting cavity; 2.5. Fixed part; 2.6. Groove; 2.61. Limiting edge; 2.7. Connecting shaft; 2.8. Abutment part; 3. Output assembly; 4. Circuit board; 4.1. Potentiometer; 4.2. Detection shaft; 5. Worm gear; 6. Double gear; 7. Reduction gear; 8. Support part; 9. Controller; 10. PTC thermal protector; Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0044] like Figure 1-13 As shown, a torsion spring damping actuator for a car charging door includes:

[0045] The system includes a motor 1, a damping gear set 2 disposed on the torque transmission path, and an output component 3 disposed at the end of the torque transmission path. The damping gear set 2 is used for torque transmission, and the output component 3 is used to receive torque from the motor 1 and is connected to a charging gate. The damping gear set 2 includes:

[0046] The first transmission gear 2.1 and the second transmission gear 2.2 are coaxially arranged, and a damping torsion spring 2.3 is disposed between the first transmission gear 2.1 and the second transmission gear 2.2. The damping torsion spring 2.3 is fixedly connected to the first transmission gear 2.1 and is interference-fitted with the second transmission gear 2.2.

[0047] One of the first transmission gear 2.1 and the second transmission gear 2.2 receives torque from the motor 1, and the other of the first transmission gear 2.1 and the second transmission gear 2.2 outputs torque toward the output assembly 3, thereby making the damping torsion spring 2.3 an intermediate transmission component between the first transmission gear 2.1 and the second transmission gear 2.2, thus completing the power transmission when the motor 1 is working. During the electric opening and closing process, the damping torsion spring 2.3 engages with the second transmission gear 2.2 in a static friction manner.

[0048] It is worth mentioning that, due to its helical characteristics, when the first transmission gear 2.1 and the second transmission gear 2.2 are driven in the electric opening direction, the damping torsion spring 2.3 undergoes a first radial change under the action of the opening actuation force and further engages with the second transmission gear 2.2. However, when driven in the electric closing direction, the damping torsion spring 2.3 undergoes a second radial change under the action of the closing actuation force. The second radial change is opposite to the first radial change and is away from the engagement direction with the second transmission gear 2.2. Therefore, it can operate with a smaller driving torque in the closing direction than in the opening direction.

[0049] The first radial direction and the second radial direction specifically refer to the direction in which the damping torsion spring 2.3 is aligned with or deviates from the helical direction of the damping torsion spring 2.3, causing the damping torsion spring 2.3 to tighten inward or expand outward in the radial direction, thereby further cooperating with the second transmission gear, or relaxing relative to the second transmission gear.

[0050] Specifically, the damping torsion spring 2.3 in the interference state receives the torque of the motor 1 and has a predetermined limit opening torque and limit closing torque. The limit opening torque is greater than the limit closing torque. When the user manually applies actuating force to the electric gate, when the limit opening torque is exceeded, the damping torsion spring 2.3 and the second transmission gear 2.2 generate frictional slippage in the opening direction to realize the user's manual forced opening. When the limit closing torque is exceeded, the damping torsion spring 2.3 and the second transmission gear 2.2 generate frictional slippage in the closing direction to realize the user's manual push closing.

[0051] In the power-off state, the output component 3 receives the opening actuation force from the outside and transmits a strong opening torque greater than the limit opening torque. Under the strong opening torque, the second transmission gear 2.2 slips against the damping torsion spring 2.3. In the electrically closed state, the output component 3 receives the closing actuation force from the outside and transmits a push-close torque greater than the limit closing torque. The strong opening torque is greater than the push-close torque. Under the push-close torque, the second transmission gear 2.2 slips against the damping torsion spring 2.3. Furthermore, since the opening torque and the push-close torque act on the damping torsion spring 2.3 in two different directions, the damping torsion spring 2.3 can provide the user with different strong opening and push-close sensations.

[0052] It is worth mentioning that a damping torsion spring 2.3 is used as an intermediate transmission component. The damping torsion spring 2.3 transmits power to the second transmission gear 2.2 through its inner or outer wall surface, or generates friction and slippage, thereby reducing transmission noise during electric transmission or friction and slippage, reducing the number of parts involved in the clutch action, simplifying the structure and reducing assembly difficulty.

[0053] As one way of installing the damping torsion spring 2.3 in the damping gear set 2, a mounting cavity 2.4 for accommodating the damping torsion spring 2.3 is provided between the first transmission gear 2.1 and the second transmission gear 2.2. The mounting cavity 2.4 is defined in the part where the first transmission gear 2.1 and the second transmission gear 2.2 overlap in the axial direction, so that the damping torsion spring 2.3 is accommodated and limited between the first transmission gear 2.1 and the second transmission gear 2.2.

[0054] Specifically, one end of the damping torsion spring 2.3 has a fixed end 2.31 extending axially, the first transmission gear 2.1 is provided with a fixing part 2.5 for the fixed end 2.31 to be inserted, and the second transmission gear 2.2 is provided with an abutment part 2.8 supported on the other end of the damping torsion spring 2.3.

[0055] It should be noted that the first transmission gear 2.1 and the second transmission gear 2.2 are defined as reference components that are fixed relative to the damping torsion spring 2.3 or have an interference fit with the damping torsion spring 2.3 so that they can slide relative to each other under the action of external force. In the above embodiments, the first transmission gear 2.1 or the second transmission gear 2.2 is not limited as the input side or the output side of torque.

[0056] like Figure 2 and Figure 3 As shown, specifically, a worm 5 is mounted on the output shaft of motor 1, and the worm 5 meshes with a double gear 6. The double gear 6 meshes with one of the first transmission gear 2.1 or the second transmission gear 2.2; or, a worm 5 is mounted on the output shaft of motor 1, and the worm 5 meshes with a double gear 6. The double gear 6 also meshes with a reduction gear 7, and the reduction gear 7 meshes with one of the first transmission gear 2.1 or the second transmission gear 2.2 located on the input side of torque transmission.

[0057] Among them, the upper part of the double gear 6 cooperates with the worm 5 to form a worm gear 5 structure, which provides self-locking of the damping gear set 2 on the front side of the torque transmission path in the closed state, so that when the user manually forces open the electric door in the power failure state, the input gear of the damping gear set 2 can remain stationary.

[0058] like Figures 4 to 7 As shown, in one embodiment of the damping gear set 2, the first transmission gear 2.1 serves as the input gear and the second transmission gear 2.2 serves as the output gear. The first transmission gear 2.1 receives torque from the motor 1 and has an outer diameter larger than that of the second transmission gear 2.2.

[0059] The first transmission gear 2.1 has a groove 2.6 for accommodating the damping torsion spring 2.3. The second transmission gear 2.2 has a connecting shaft 2.7 inserted into and passing through the groove 2.6. The opening of the groove 2.6 faces the connecting shaft 2.7, and the outer wall of the connecting shaft 2.7 and the inner wall of the groove 2.6 are radially projected to coincide. The upper end of the groove 2.6 has a fixing part 2.5. The fixing end 2.31 of the damping torsion spring 2.3 is inserted and fixed in the fixing part 2.5 in the groove 2.6. The damping torsion spring 2.3 is tightly held on the connecting shaft 2.7 by an interference fit. The bottom of the connecting shaft 2.7 has an abutment part 2.8 that receives the bottom of the damping torsion spring 2.3. Under the action of a strong opening torque or a push-closing torque, the damping torsion spring 2.3 rubs and slips relative to the connecting shaft 2.7, while the first transmission gear 2.1 and the fixing end 2.31 of the damping torsion spring 2.3 remain stationary.

[0060] Specifically, one end of the damping torsion spring 2.3 extends axially and radially to form a fixed end 2.31. The fixed end 2.31 is inserted into the fixed part 2.5 of the groove 2.6. The fixed part 2.5 is specifically formed on the extension line of the circumferential tangent of the torsion spring. The groove 2.6 is provided with a limiting edge 2.61 that abuts against one side of the fixed end 2.31 of the damping torsion spring 2.3. The limiting edge 2.61 is preferably collinear with or parallel to the tangent. Through the above improvements, the damping torsion spring 2.3 and the first transmission gear 2.1 can be reliably fixed.

[0061] Preferably, the abutment portion 2.8 on the connecting shaft 2.7 is flush with the plane where the groove 2.6 opening of the first transmission gear 2.1 is located.

[0062] In this embodiment, when the user actuates the electric door from the outside with external force, the damping torsion spring 2.3 receives the force in the circumferential direction through the connecting shaft 2.7, and the first radial direction is defined as radially tightening inward, that is, the direction of action is in the same direction as the helical direction of the damping torsion spring 2.3, so that the inner wall of the damping torsion spring 2.3 is further tightened on the connecting shaft 2.7, thereby generating a large frictional force, forcing the user to apply a force greater than the limit opening torque, ensuring the sliding friction between the damping torsion spring 2.3 and the connecting shaft 2.7;

[0063] Conversely, during electric closing, when the user pushes the electric door closed from the outside with external force, the damping torsion spring 2.3 receives the force in the circumferential direction through the connecting shaft 2.7, and the second radial direction is positioned to expand radially outward, that is, the direction of action is opposite to the helical direction of the damping torsion spring 2.3, causing the damping torsion spring 2.3 to expand radially, and causing the inner wall of the damping torsion spring 2.3 to move away from the outer wall of the connecting shaft 2.7. At this time, the outer wall of the damping torsion spring 2.3 abuts against the inner wall of the groove 2.6 due to the expansion action, forcing the user to apply a force greater than the limit closing torque, so as to ensure the sliding friction between the damping torsion spring 2.3 and the connecting shaft 2.7.

[0064] As an example, the driving torque provided by motor 1 is greater than 2 N·m. Through the above torque transmission, the holding force of the electric gate is provided to be 20 N to 32 N. When the electric gate is manually forcibly opened, the torque transmitted to the output component 3 is 4.4 N·m to 7 N·m. When the electric gate is manually pushed closed, the torque transmitted to the output component 3 is 1.76 N·m to 2.64 N·m. The force provided for manually pushing and closing the electric gate is approximately 10 N ± 2 N.

[0065] like Figures 8 to 10 As shown, in another embodiment of the damping gear set 2, the second transmission gear 2.2 serves as the input gear and the first transmission gear 2.1 serves as the output gear. The second transmission gear 2.2 receives torque from the motor 1 and has an outer diameter larger than that of the first transmission gear 2.1.

[0066] Specifically, the second transmission gear 2.2 receives torque from the motor 1. The second transmission gear 2.2 has a groove 2.6 for accommodating the damping torsion spring 2.3. The damping torsion spring 2.3 is pressed against the inner wall of the groove 2.6 by an interference fit. The first transmission gear 2.1 has a connecting shaft 2.7 inserted into and passing through the groove 2.6. The end of the damping torsion spring 2.3 is fixed to the end of the connecting shaft 2.7. The lower end of the connecting shaft 2.7 forms a flat abutment portion 2.8, and a fixing part 2.5 is formed on one axial side of the abutment portion 2.8 for inserting the fixing end 2.31 of the damping torsion spring 2.3. Under the action of the opening torque or the closing torque, the damping torsion spring 2.3 and the connecting shaft 2.7 together rub against and slip against the inner wall of the groove 2.6, while the second transmission gear 2.2 remains stationary.

[0067] Preferably, the abutment portion 2.8 on the connecting shaft 2.7 is flush with the plane where the groove 2.6 opening of the first transmission gear 2.1 is located.

[0068] In this embodiment, when the user actuates the electric door from the outside by external force, the damping torsion spring 2.3 receives the force in the circumferential direction through the connecting shaft 2.7, and the first radial direction is defined as radially expanding outward, that is, the direction of action is opposite to the helical direction of the damping torsion spring 2.3, so that the outer wall of the damping torsion spring 2.3 is further pressed against the inner wall of the groove 2.6, thereby generating a large frictional force, forcing the user to apply a force greater than the limit opening torque, ensuring that the damping torsion spring 2.3 and the connecting shaft 2.7 slide and rub against each other relative to the inner wall of the groove 2.6.

[0069] Conversely, during electric closing, when the user pushes the electric door closed from the outside with external force, the damping torsion spring 2.3 receives the force in the circumferential direction through the connecting shaft 2.7, and the second radial direction is positioned to tighten radially inward, that is, the direction of action is along the helical direction of the damping torsion spring 2.3, causing the damping torsion spring 2.3 to retract radially, so that the outer wall of the damping torsion spring 2.3 is relatively away from the inner wall of the groove 2.6. At this time, under the limitation of the connecting shaft 2.7, the outer wall of the damping torsion spring 2.3 is still in contact with the inner wall of the groove 2.6, forcing the user to apply a force greater than the limit closing torque to ensure the sliding friction between the damping torsion spring 2.3 and the connecting shaft 2.7.

[0070] As an example, through the torque transmission described above, the holding force of the electric gate is provided to be between 18N and 36N. When the electric gate is manually opened, the torque transmitted to the output component 3 is between 4N.m and 8N.m. When the electric gate is manually pushed closed, the torque transmitted to the output component 3 is between 1.4Nm and 2.3Nm. The force provided for manually pushing and closing the electric gate is approximately 6.5 to 10.5N.

[0071] like Figures 11 to 13 As shown, in another embodiment of the damping gear set 2, the second transmission gear 2.2 serves as the input gear and the first transmission gear 2.1 serves as the output gear. The second transmission gear 2.2 receives torque from the motor 1 and has an outer diameter larger than that of the first transmission gear 2.1.

[0072] Specifically, the second transmission gear 2.2 receives torque from the motor 1. The second transmission gear 2.2 is provided with a groove 2.6 for accommodating the damping torsion spring 2.3, and a connecting shaft 2.7 extending axially in the groove 2.6. The damping torsion spring (2.3) is pressed against the outer wall of the connecting shaft (2.7) by an interference fit. The damping torsion spring (2.3) slips against the outer wall of the connecting shaft (2.7) under the action of a strong opening torque or a push-closing torque.

[0073] The damping torsion spring 2.3 is pressed against the outer wall of the connecting shaft 2.7 by an interference fit. The first transmission gear 2.1 is provided with a support portion 8 facing the groove 2.6. One end of the damping torsion spring 2.3 has a fixed end 2.31 extending radially. The support portion 8 is provided with a fixing part 2.5 for the fixed end 2.31 to be inserted. The end of the first transmission gear 2.1 opposite to its teeth forms a plate-shaped support portion 8. The fixing part 2.5 is a protrusion provided on the radially outer side of the damping torsion spring 2.3. The protrusion is locked on both sides of the fixed end 2.31 of the damping torsion spring 2.3, thereby playing a fixing role. Under the action of strong opening torque or push-closing torque, the damping torsion spring 2.3 and the first transmission gear 2.1 together rub against and slip against the outer wall of the connecting shaft 2.7, while the second transmission gear 2.2 remains stationary.

[0074] In this embodiment, when the user actuates the electric door from the outside by external force, the damping torsion spring 2.3 receives the force in the circumferential direction through the fixed end 2.31, and the first radial direction is defined as radially tightening inward, that is, the direction of action is the same as the helical direction of the damping torsion spring 2.3, so that the inner wall of the damping torsion spring 2.3 further presses against the outer wall of the connecting shaft 2.7, thereby generating a large frictional force, forcing the user to apply a force greater than the limit opening torque, ensuring that the damping torsion spring 2.3 and the first transmission gear 2.1 slide and rub against each other relative to the outer wall of the connecting shaft 2.7.

[0075] Conversely, during electric closing, when the user pushes the electric door closed from the outside with external force, the damping torsion spring 2.3 receives the force in the circumferential direction through the fixed end 2.31, and the second radial direction is positioned to expand radially outward, that is, the direction of action is opposite to the helical direction of the damping torsion spring 2.3, causing the damping torsion spring 2.3 to expand radially, and causing the inner wall of the damping torsion spring 2.3 to move away from the outer wall of the connecting shaft 2.7. At this time, under the limitation of the groove 2.6, the inner wall of the damping torsion spring 2.3 is still in contact with the outer wall of the connecting shaft 2.7, forcing the user to apply a force greater than the limit closing torque to ensure the sliding friction between the damping torsion spring 2.3 and the connecting shaft 2.7.

[0076] In this embodiment, the second transmission gear 2.1 also has a receiving portion with an inner diameter greater than that of the groove 2.6, which is used to receive the radially extended portion of the fixed end of the damping torsion spring 2.3, and the opening of the receiving portion is flush with the plane in which it is located.

[0077] As an example, through the torque transmission described above, the holding force of the electric gate is provided to be 20N to 32N. When the electric gate is manually opened, the torque transmitted to the output component 3 is 4.4Nm to 7N.m. When the electric gate is manually pushed closed, the torque transmitted to the output component 3 is 1.76Nm to 2.64Nm. The force provided for manually pushing and closing the electric gate is approximately 8 to 12N.

[0078] In both of the above-mentioned methods of fixing the damping torsion spring 2.3 to the first transmission gear 2.1 and the second transmission gear 2.2, the necessary holding force can be provided for the electric gate in the driving state, without the need to add an additional locking structure to the electric gate; and by using the damping torsion spring 2.3 as an intermediate transmission component, stepless rotation can be achieved when manually opening and closing, providing a better door-pushing experience. Moreover, the electric gate can be operated manually whether it is electrically opened and closed or in the event of a power failure. In this process, thanks to the friction clutch transmission of the damping torsion spring 2.3, transmission noise is effectively reduced. In addition, thanks to the setting of the damping torsion spring 2.3, the rotational torque when friction slips in the opening direction is greater than the rotational torque when friction slips in the closing direction.

[0079] In the above embodiment, the output component 3 refers to an end gear that meshes with one of the first transmission gear 2.1 and the second transmission gear 2.2 on the torque output side, and the end gear is provided with a spline for connecting with the electric sluice gate drive.

[0080] Specifically, the actuator also includes a circuit board 4 and a potentiometer 4.1 mounted on the circuit board 4. The output component 3 includes a coaxially driven output gear and a detection shaft 4.2. The output gear meshes with another of the first transmission gear 2.1 and the second transmission gear 2.2. The detection shaft 4.2 passes through the potentiometer 4.1.

[0081] The potentiometer 4.1 provides feedback on the position signal. When an obstacle is encountered, the stall current of motor 1 is collected, and the reverse motion is executed to achieve the anti-pinch function. The potentiometer 4.1 is a resistive angle sensor, which can realize positioning control of any running position within a 320° range with an angle control accuracy of 2%, thereby accurately positioning the electric gate.

[0082] Another objective of this utility model is to provide a control method for an actuator, based on the damping torsion spring 2.3 of the above embodiment, to achieve slippage during forced opening and forced closing, when the small door is electrically opened or closed:

[0083] The BCM sends a command to the BCM to open or close the small door via the central control screen, remote key, etc. After receiving the command, the BCM sends an opening or closing command to the small door actuator.

[0084] The small door actuator receives the action signal sent by the vehicle's MCU chip, drives the motor to move and open or close the small door, and at the same time the angle sensor feeds back the current angle position to the MCU;

[0085] The angle sensor tells the MCU that it has reached the termination position. At the same time, the MCU determines that the motor current has reached the set stall current, and the MCU stops driving the motor.

[0086] The vehicle's MCU chip uses the LIN signal to provide feedback on whether the BCM door is fully open or closed.

[0087] During the above process, the small door actuator collects angle signals from the angle sensor. If it stalls in the non-termination area, it performs a stall return operation to achieve anti-pinch and fault return functions. When the vehicle's circuit fails or the battery power is too low, and the small door cannot be opened electrically, it can be manually forced open. The small door actuator has a built-in worm gear mechanism for self-locking, and combined with a damping torsion spring, it provides a holding force of 20N to 32N for the small door. The small door actuator has a built-in damping torsion spring to provide the ultimate closing torque value for manually pushing and closing the small door, and can also realize automatic closing.

[0088] like Figure 14 As shown, the MCU and BCM mentioned above can generally refer to the controller of the actuator. As a further implementation of the motor and controller, the motor has pin PIN1 and pin PIN2. A PTC thermal protector is also arranged between pin PIN1 and the motor. Pin PIN1 and pin PIN2 are both connected to the controller. Pin PIN1 and pin PIN2 are set to be connected to a 12V constant power input with a rated current of 0.2A.

[0089] During the work process:

[0090] When pin1 is "-" and pin2 is "+", the actuator performs the door closing action; PWM control: frequency 20KHz, voltage 13.6V, 66.2% PWM control, the remaining voltage is adjusted according to the speed of the small door;

[0091] When pin1 is "+" and pin2 is "-", the actuator performs the door opening action; PWM control: frequency 20KHz, voltage 13.6V, 66.2% PWM control, the remaining voltage is adjusted according to the speed of the small door;

[0092] The potentiometer has pins PIN3, PIN4, and PIN5 that connect to the controller. Pin PIN3 is configured as the 5V input voltage side, pin PIN4 as the output voltage side, and pin PIN5 as the 5V output voltage side. The resistance R1 connecting pins PIN3 to PIN5 is 10KΩ ± 30%. The voltage ratio of pin PIN4 in the closed position is U(Pin3-Pin4) / U(Pin3-Pin5) = 50% (+ / - 5%); in the open position, the voltage ratio is U(Pin3-Pin4).

[0093] / U(Pin3-Pin5)=77% (+ / -5%).

[0094] In other embodiments, the damping torsion spring also applies an axial force, thereby reducing the backlash between the first and second transmission gears and further reducing motion noise.

[0095] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A torsion spring damping actuator for a car charging door, characterized in that, include: The motor (1), the damping gear set (2) disposed on the torque transmission path, and the output component (3) disposed at the end of the torque transmission path, wherein the damping gear set (2) includes: A first transmission gear (2.1) and a second transmission gear (2.2) are coaxially arranged, and a damping torsion spring (2.3) is disposed between the first transmission gear (2.1) and the second transmission gear (2.2). The damping torsion spring (2.3) is fixedly connected to the first transmission gear (2.1) and has an interference fit with the second transmission gear (2.2). One of the first transmission gear (2.1) and the second transmission gear (2.2) receives torque from the motor (1), and the other of the first transmission gear (2.1) and the second transmission gear (2.2) outputs torque toward the output assembly (3). The damping torsion spring (2.3) undergoes a first radial change under the action of the open actuation force and further engages with the second transmission gear (2.2), or the damping torsion spring (2.3) undergoes a second radial change under the action of the closed actuation force, the second radial change being opposite to the first radial change and deviating from the engagement direction with the second transmission gear (2.2).

2. The torsion spring damping actuator for a car charging door according to claim 1, characterized in that: The damping torsion spring (2.3) in the interference state receives the torque of the motor (1) and has a predetermined limit opening torque and limit closing torque, wherein the limit opening torque is greater than the limit closing torque.

3. The torsion spring damping actuator for a car charging door according to claim 2, characterized in that: The output component (3) receives the opening actuation force from the outside and transmits a strong opening torque greater than the limit opening torque, and the second transmission gear (2.2) slips against the damping torsion spring (2.3) under the strong opening torque; The output component (3) receives the closing actuation force from the outside and transmits a push-close torque greater than the limit closing torque, the force opening torque being greater than the push-close torque, and the second transmission gear (2.2) slips against the damping torsion spring (2.3) under the push-close torque.

4. The torsion spring damping actuator for a car charging door according to claim 1, characterized in that: A mounting cavity (2.4) for accommodating a damping torsion spring (2.3) is provided between the first transmission gear (2.1) and the second transmission gear (2.2), the mounting cavity (2.4) being defined in the portion where the first transmission gear (2.1) and the second transmission gear (2.2) overlap in the axial direction.

5. The torsion spring damping actuator for a car charging door according to claim 1, characterized in that: One end of the damping torsion spring (2.3) has a fixed end (2.31) extending axially or radially. The first transmission gear (2.1) is provided with a fixed part (2.5) for engaging with the fixed end (2.31). The second transmission gear (2.2) is provided with an abutment part (2.8) supported on the other end of the damping torsion spring (2.3).

6. A torsion spring damping actuator for a car charging door according to any one of claims 1 to 5, characterized in that: The first transmission gear (2.1) receives torque from the motor (1). The first transmission gear (2.1) has a groove (2.6) for accommodating the damping torsion spring (2.3). The end of the damping torsion spring (2.3) is fixed in the groove (2.6). The second transmission gear (2.2) has a connecting shaft (2.7) inserted into and passing through the groove (2.6). The damping torsion spring (2.3) is tightly held on the connecting shaft (2.7) by interference fit. The damping torsion spring (2.3) slips relative to the connecting shaft (2.7) under the action of strong opening torque or push-closing torque.

7. A torsion spring damping actuator for a car charging door according to any one of claims 1 to 5, characterized in that: The second transmission gear (2.2) receives torque from the motor (1). The second transmission gear (2.2) has a groove (2.6) for accommodating the damping torsion spring (2.3). The damping torsion spring (2.3) is pressed against the inner wall of the groove (2.6) by an interference fit. The first transmission gear (2.1) has a connecting shaft (2.7) inserted into and passing through the groove (2.6). The end of the damping torsion spring (2.3) is fixed to the end of the connecting shaft (2.7). The damping torsion spring (2.3) slips against the inner wall of the groove (2.6) under the action of a strong opening torque or a push-close torque.

8. A torsion spring damping actuator for a car charging port according to any one of claims 1 to 5, characterized in that: The second transmission gear (2.2) receives torque from the motor (1). The second transmission gear (2.2) has a groove (2.6) for accommodating the damping torsion spring (2.3) and a connecting shaft (2.7) extending axially within the groove (2.6). The damping torsion spring (2.3) is pressed against the outer wall of the connecting shaft (2.7) by an interference fit. The first transmission gear (2.1) has a support portion (8) facing the groove (2.6). One end of the damping torsion spring (2.3) has a fixed end (2.31) extending radially. The support portion (8) has a fixing part (2.5) for inserting the fixed end (2.31). The damping torsion spring (2.3) slips against the outer wall of the connecting shaft (2.7) under the action of a strong opening torque or a push-close torque.

9. The torsion spring damping actuator for a car charging door according to claim 6, characterized in that: One end of the damping torsion spring (2.3) extends axially and radially to form a fixed end (2.31), which is inserted into a groove (2.6), and the groove (2.6) is provided with a limiting edge (2.61) that abuts against one side of the fixed end (2.31) of the damping torsion spring (2.3).

10. The torsion spring damping actuator for a car charging door according to claim 1, characterized in that: The output component (3) includes a coaxially driven output gear and a detection shaft (4.2). The output gear meshes with another of the first transmission gear (2.1) and the second transmission gear (2.2). The detection shaft (4.2) passes through the potentiometer (4.1). The actuator also includes a circuit board (4) and a potentiometer (4.1) mounted on the circuit board (4). A worm gear (5) is sleeved on the output shaft of the motor (1), and the worm gear (5) meshes with a double gear (6), which meshes with either the first transmission gear (2.1) or the second transmission gear (2.2). Alternatively, a worm gear (5) is fitted onto the output shaft of the motor (1), the worm gear (5) meshes with a double gear (6), the double gear (6) also meshes with a reduction gear (7), and the reduction gear (7) meshes with one of the first transmission gear (2.1) or the second transmission gear (2.2).

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