Torsional spring damping actuator for small charging door of automobile

Abstract

The invention 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. 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] The invention relates to the technical field of automobile parts, and in particular to a torsion spring damping actuator for an automobile charging door. Background Art

[0002] Currently, electronic actuators used in the market are applied to vehicle components that can be manually operated by users, such as electric doors, wherein the actuators generally include a motor and a gear transmission device connected to the motor;

[0003] A vehicle actuator in the prior art has a clutch device in the gear transmission device in order to achieve transmission clutch under power failure. The clutch device is usually composed of two concave-convex components that are axially abutted against each other. When excessive torque is applied, the two concave-convex components can be axially separated to achieve transmission disconnection. However, there is also an elastic member that allows the two concave-convex components to return to a reset state. The elastic member causes the two concave-convex components to return to an engaged state after separation. As the large torque is continuously applied, the two concave-convex components produce a "clicking" noise.

[0004] The prior art discloses a driving device for a rotating part of a motor vehicle with publication number CN118066226A. It provides two clutches inside and sets the slipping torques of the two clutches respectively, thereby providing the user with different hand feelings when manually opening or manually pushing and closing the door. At the same time, a one-way transmission part is also required to ensure that the clutch with a smaller slipping torque is isolated when the small door is forced to open. The structure is relatively complex and is not conducive to mass production. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a torsion spring damping actuator for a car charging door.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: A torsion spring damping actuator for a car charging door, comprising:

[0007] A motor, a damping gear set arranged on a torque transmission path, and an output assembly arranged at an end of the torque transmission path, wherein the damping gear set comprises:

[0008] A first transmission gear and a second transmission gear are coaxially arranged, and a damping torsion spring is arranged 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 assembly;

[0009] The damping torsion spring produces a first radial change under the action of the opening actuating force and further cooperates toward the second transmission gear, or the damping torsion spring produces a second radial change under the action of the closing actuating force, and the second radial direction is opposite to the first radial direction and deviates from the cooperation direction with the second transmission gear.

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

[0011] Further, the output assembly receives the opening actuation force from the outside to transmit 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 assembly receives the closing actuating force from the outside to transmit a push-to-close torque greater than the limit closing torque, the strong opening torque is greater than the push-to-close torque, and the second transmission gear slips relative to the damping torsion spring under the push-to-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, and the mounting cavity is defined at a 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 fixing portion for plugging and fitting the fixed end, and the second transmission gear is provided with an abutment portion supported on the other end of the damping torsion spring.

[0015] Furthermore, the first transmission gear receives torque from the motor, and a groove for accommodating a damping torsion spring is provided in the first transmission gear, and an end of the damping torsion spring is fixed in the groove. The second transmission gear is provided with a connecting shaft inserted into and passed through the groove, and the damping torsion spring is clamped on the connecting shaft by an interference fit. The damping torsion spring rubs and slips relative to the connecting shaft under the action of a strong opening torque or a pushing closing torque.

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

[0017] Furthermore, the second transmission gear receives torque from the motor, and is provided with a groove for accommodating a damping torsion spring and a connecting shaft extending axially in the groove. The damping torsion spring is pressed against the outer wall of the connecting shaft by interference fit, and the first transmission gear is provided with a supporting portion facing the groove. One end of the damping torsion spring has a fixed end extending radially, and the supporting portion is provided with a fixing portion for the fixed end to be plugged in. The damping torsion spring rubs and slips relative to the outer wall of the connecting shaft under the action of a strong opening torque or a pushing closing torque.

[0018] Furthermore, one end of the damping torsion spring extends in the axial and radial directions to form a fixed end, the fixed end is inserted into the groove, and the groove is provided with a limiting edge abutting against one side of the fixed end of the damping torsion spring.

[0019] Furthermore, a circuit board and a potentiometer arranged on the circuit board are also provided in the actuator, and the output component includes a coaxially driven output gear and a detection shaft, the output gear is meshed with the other of the first transmission gear and the second transmission gear, and the detection shaft is passed through the potentiometer.

[0020] Furthermore, a worm is sleeved on the output shaft of the motor, the worm is meshed with a double gear, and the double gear is meshed with one of the first transmission gear or the second transmission gear;

[0021] Alternatively, a worm is sleeved on the output shaft of the motor, the worm is meshed with a double gear, the double gear is also meshed with a reduction gear, and the reduction gear is meshed 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] The present invention uses a damping torsion spring as an intermediate transmission member 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. The damping torsion spring is also pressed against the second transmission gear in an interference fit manner. Under normal conditions, the motor can transmit torque to the output assembly through the first transmission gear, the damping torsion spring and the second transmission gear, thereby reducing the number of components for clutching, simplifying the structure, and reducing the difficulty of assembly.

[0024] In the power-off state, the user applies a strong opening torque greater than the limit opening torque externally, or applies a push-closing torque greater than the limit closing torque externally during electric closing, so that the damping torsion spring can cause friction and slip relative to the second transmission gear, thereby reducing clutch noise;

[0025] Moreover, in this process, since the opening torque and the push-closing torque act on the damping torsion spring in two different directions, the damping torsion spring can provide the user with different strong opening feel and push-closing feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

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

[0028] Figure 3 It is a schematic diagram of the structure of the present invention after the circuit board is removed;

[0029] Figure 4 is a cross-sectional view of a first embodiment of a damping gear set of the present invention;

[0030] Figure 5 A schematic diagram of a first transmission gear of a first embodiment of a damping gear set of the present invention;

[0031] Figure 6 An exploded view of a first embodiment of a damping gear set of the present invention;

[0032] Figure 7 An exploded view of the first embodiment of the damping gear set of the present invention from another angle;

[0033] Figure 8 is a cross-sectional view of a second embodiment of the damping gear set of the present invention;

[0034] Fig. 9 An exploded view of a second embodiment of the damping gear set of the present invention;

[0035] Fig.10 An exploded view of the second embodiment of the damping gear set of the present invention from another angle;

[0036] Fig.11 is a cross-sectional view of a third embodiment of the damping gear set of the present invention;

[0037] Fig.12 An exploded view of a third embodiment of a damping gear set of the present invention;

[0038] Fig.13 An exploded view of the third embodiment of the damping gear set of the present invention from another angle;

[0039] Fig.14 It is a connection diagram of the controller and the potentiometer of the present invention;

[0040] In the figure:

[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; 6. Double gear; 7. Reduction gear; 8. Supporting part; 9. Controller; 10. PTC thermal protector; DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be understood that although the terms upper, middle, lower, top, end, etc. appear in this article to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, and are not used to define any direction or order limitation.

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

[0045] A motor 1, a damping gear set 2 arranged on a torque transmission path, and an output assembly 3 arranged at the end of the torque transmission path, wherein the damping gear set 2 is used for torque transmission, and the output assembly 3 is used for receiving torque from the motor 1 side and connecting the charging door, wherein the damping gear set 2 includes:

[0046] A first transmission gear 2.1 and a second transmission gear 2.2 are coaxially arranged, and a damping torsion spring 2.3 is arranged 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 fit with the second transmission gear 2.2.

[0047] One of the first transmission gear 2.1 and the second transmission gear 2.2 receives the torque from the motor 1, and the other of the first transmission gear 2.1 and the second transmission gear 2.2 outputs the torque toward the output assembly 3, so that the damping torsion spring 2.3 is used as an intermediate transmission member between the first transmission gear 2.1 and the second transmission gear 2.2, so as to complete the power transmission when the motor 1 is working. During the electric opening and closing process, the damping torsion spring 2.3 cooperates with the second transmission gear 2.2 in a static friction manner.

[0048] It is worth mentioning that, due to the spiral characteristics of the damping torsion spring 2.3, when the first transmission gear 2.1 and the second transmission gear 2.2 are transmitted in the electric opening direction, the damping torsion spring 2.3 produces a first radial change under the action of the opening actuating force and further cooperates toward the second transmission gear 2.2, while when the first transmission gear 2.1 and the second transmission gear 2.2 are transmitted in the electric closing direction, the damping torsion spring 2.3 produces a second radial change under the action of the closing actuating force, and the second radial direction is opposite to the first radial direction and deviates from the cooperation direction with the second transmission gear 2.2, so that it can move in the closing direction with a smaller driving torque than in the opening direction.

[0049] The first radial direction and the second radial direction specifically refer to the spiral direction along or away from the damping torsion spring 2.3, so that the damping torsion spring 2.3 is tightened inwardly or expanded outwardly in the radial direction to further cooperate with the second transmission gear, or is loosened 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 a limit closing torque, and the limit opening torque is greater than the limit closing torque. When the user manually applies an actuating force to the electric small door, when the limit opening torque is exceeded, the damping torsion spring 2.3 and the second transmission gear 2.2 produce friction and slippage in the opening direction to achieve manual forced opening by the user; when the limit closing torque is exceeded, the damping torsion spring 2.3 and the second transmission gear 2.2 produce friction and slippage in the closing direction to achieve manual push closing by the user.

[0051] Among them, in the power-off state, the output component 3 receives the opening actuating force from the outside, and transmits a strong opening torque greater than the limit opening torque, and the second transmission gear 2.2 frictionally slips relative to the damping torsion spring 2.3 under the strong opening torque; in the electric closing state, the output component 3 receives the closing actuating force from the outside, and transmits a push-closing torque greater than the limit closing torque, the strong opening torque is greater than the push-closing torque, and the second transmission gear 2.2 frictionally slips relative to the damping torsion spring 2.3 under the push-closing torque, and since the opening torque and the push-closing torque act on the damping torsion spring 2.3 in two different directions, the damping torsion spring 2.3 can provide users with different strong opening feel and push-closing feel.

[0052] It is worth mentioning that the damping torsion spring 2.3 is used as the intermediate transmission component. The damping torsion spring 2.3 transmits power to the second transmission gear 2.2 through its inner wall or outer wall, or generates friction and slippage, thereby reducing the transmission noise during electric transmission or friction and slippage, and reducing the parts for clutching, with a simple structure and reduced assembly difficulty.

[0053] As an installation method of 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 at the axially overlapping portion of the first transmission gear 2.1 and the second transmission gear 2.2, so that the damping torsion spring 2.3 is accommodated and confined 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 fixed portion 2.5 for plugging the fixed end 2.31, and the second transmission gear 2.2 is provided with an abutment portion 2.8 supported on the other end of the damping torsion spring 2.3.

[0055] It should be pointed out 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 relative to the damping torsion spring 2.3 so as to be able to slide relatively under the action of external force. The above embodiments do not limit the first transmission gear 2.1 or the second transmission gear 2.2 as the input side or output side of the torque.

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

[0057] Among them, the upper link of the double gear 6 cooperates with the worm 5 to form a worm gear 5 structure to provide self-locking of the damping gear set 2 on the front side of the torque transmission path in the closed state, so that in the power-off state, when the user manually forces the electric small door to be opened, the input gear of the damping gear set 2 can be kept stationary.

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

[0059] A groove 2.6 for accommodating the damping torsion spring 2.3 is provided in the first transmission gear 2.1, and a connecting shaft 2.7 inserted into and penetrated in the groove 2.6 is provided on the second transmission gear 2.2. The opening direction of the groove 2.6 is set toward the connecting shaft 2.7, and the outer wall of the connecting shaft 2.7 coincides with the radial projection of the inner wall of the groove 2.6. A fixing portion 2.5 is provided at the upper end of the groove 2.6, and a fixing end 2.31 of the damping torsion spring 2.3 is inserted and fixed in the fixing portion 2.5 in the groove 2.6. The damping torsion spring 2.3 is tightly held on the connecting shaft 2.7 by interference fit, and the bottom of the connecting shaft 2.7 has an abutment portion 2.8 received at the bottom of the damping torsion spring 2.3. The damping torsion spring 2.3 rubs and slips relative to the connecting shaft 2.7 under the action of a strong opening torque or a push-closing torque, while the first transmission gear 2.1 and the fixed 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, and the fixed end 2.31 is inserted into the fixed portion 2.5 of the groove 2.6. The fixed portion 2.5 is specifically opened on the extension line of the circumferential tangent of the torsion spring, and the groove 2.6 is provided with a limiting edge 2.61 abutting against one side of the fixed end 2.31 of the damping torsion spring 2.3. The limiting edge 2.61 is preferably colinear or parallel to the above-mentioned 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 opening of the groove 2.6 of the first transmission gear 2.1 is located.

[0062] In this embodiment, when the user actuates the electric door to open 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 radial tightening inward, that is, the action direction is along the spiral 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, and a larger friction force is generated, forcing the user to apply a force greater than the limit opening torque to ensure the sliding friction between the damping torsion spring 2.3 and the connecting shaft 2.7;

[0063] On the contrary, during electric closing, when the user pushes the electric small door to close from the outside through 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 spiral direction of the damping torsion spring 2.3, so that the damping torsion spring 2.3 expands in the radial direction, and the inner wall of the damping torsion spring 2.3 is relatively away from the outer wall of the connecting shaft 2.7. At this time, the outer wall of the damping torsion spring 2.3 is against the inner wall of the groove 2.6 due to the expansion effect, 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.

[0064] As an example, the driving torque provided by the motor 1 is greater than 2N.m. Through the above-mentioned torque transmission, the holding force of the electric small door is provided in the range of 20N to 32N. When the electric small door is manually opened, the torque transmitted to the output component 3 is 4.4Nm to 7N.m. When the electric small door is manually closed, the torque transmitted to the output component 3 is 1.76Nm to 2.64Nm, providing a manual closing force of the electric small door of approximately 10N±2N.

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

[0066] Specifically, the second transmission gear 2.2 receives the torque from the motor 1, and a groove 2.6 for accommodating the damping torsion spring 2.3 is provided in the second transmission gear 2.2. The damping torsion spring 2.3 is pressed against the inner wall of the groove 2.6 by interference fit. A connecting shaft 2.7 is provided on the first transmission gear 2.1 and inserted into and penetrates the groove 2.6. The end of the damping torsion spring 2.3 is fixed to the end of the connecting shaft 2.7, wherein a flat abutting portion 2.8 is formed at the lower end of the connecting shaft 2.7, and a fixed portion 2.5 for inserting a fixed end 2.31 of the damping torsion spring 2.3 is formed on one axial side of the abutting portion 2.8. Under the action of a strong opening torque or a pushing closing torque, the damping torsion spring 2.3 and the connecting shaft 2.7 rub and slip relative to 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 opening of the groove 2.6 of the first transmission gear 2.1 is located.

[0068] In this embodiment, when the user actuates the electric small door to open 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 radial expansion outward, that is, the action direction is opposite to the spiral 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 larger friction 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 the inner wall of the groove 2.6;

[0069] On the contrary, during electric closing, when the user pushes the electric small door to close from the outside through 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 be tightened radially inward, that is, the action direction is along the spiral direction of the damping torsion spring 2.3, so that the damping torsion spring 2.3 shrinks in the radial direction, and 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, the damping torsion spring 2.3 is limited by the connecting shaft 2.7, and 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 above-mentioned torque transmission, the holding force of the electric small door is provided in the range of 18N to 36N. When the electric small door is manually opened, the torque transmitted to the output component 3 is 4N.m to 8N.m. When the electric small door is manually closed, the torque transmitted to the output component 3 is 1.4Nm to 2.3Nm, providing a force of about 6.5 to 10.5N for manually closing the electric small door.

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

[0072] Specifically, the second transmission gear 2.2 receives torque from the motor 1, and is provided with a groove 2.6 for accommodating the damping torsion spring 2.3, and a connecting shaft 2.7 axially extending in the groove 2.6, and a connecting shaft (2.7) axially extending in the groove (2.6), the damping torsion spring (2.3) is pressed against the outer wall of the connecting shaft (2.7) by interference fit, and the damping torsion spring (2.3) rubs and slips relative to 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 interference fit, and the first transmission gear 2.1 is provided with a supporting portion 8 facing the groove 2.6, and one end of the damping torsion spring 2.3 has a fixed end 2.31 extending radially, and the supporting portion 8 is provided with a fixing portion 2.5 for the fixed end 2.31 to be plugged in, wherein the end of the first transmission gear 2.1 away from its tooth portion forms a plate-shaped supporting portion 8, and the fixing portion 2.5 is a convex portion arranged on the radial outer side of the damping torsion spring 2.3, and the convex portion is clamped on both sides of the fixed end 2.31 of the damping torsion spring 2.3, thereby playing a fixing role, and under the action of a strong opening torque or a push-closing torque, the damping torsion spring 2.3 and the first transmission gear 2.1 rub and slip relative to 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 small door to open 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 radial tightening inward, that is, the action direction is the same as the spiral direction of the damping torsion spring 2.3, so that the inner wall of the damping torsion spring 2.3 is further pressed against the outer wall of the connecting shaft 2.7, thereby generating a larger friction 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 the outer wall of the connecting shaft 2.7;

[0075] On the contrary, during electric closing, when the user pushes the electric small door to close from the outside through 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 action direction is opposite to the spiral direction of the damping torsion spring 2.3, so that the damping torsion spring 2.3 expands in the radial direction, and the inner wall of the damping torsion spring 2.3 is relatively away from the outer wall of the connecting shaft 2.7. At this time, the damping torsion spring 2.3 is limited by the groove 2.6, and 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 further has a receiving portion with an inner diameter larger than the groove 2.6, the receiving portion is used to receive the radial extension of the fixed end of the damping torsion spring 2.3, and the opening of the receiving portion is flush with the plane where it is located.

[0077] As an example, through the above-mentioned torque transmission, the holding force of the electric small door is provided in the range of 20N to 32N. When the electric small door is manually opened, the torque transmitted to the output component 3 is 4.4Nm to 7N.m. When the electric small door is manually closed, the torque transmitted to the output component 3 is 1.76Nm to 2.64Nm, providing a force of about 8N to 12N for manually closing the electric small door.

[0078] In the above two fixing methods of the damping torsion spring 2.3 and the first transmission gear 2.1 and the second transmission gear 2.2, both can provide the necessary holding force for the electric small door in the driving state, without the need to add an additional locking structure on the electric small door; and through the damping torsion spring 2.3 as an intermediate transmission member, stepless rotation during manual forced opening and manual push closing can be achieved, providing a better door pushing experience, and the electric small door can be operated manually whether it is electric opening and closing or when the power is off. In this process, thanks to the transmission of the damping torsion spring 2.3 in the form of friction clutch, the transmission noise is effectively reduced. In addition, thanks to the setting of the damping torsion spring 2.3, the rotational torque during friction slipping in the opening direction is greater than the rotational torque during friction slipping in the closing direction.

[0079] In the above embodiment, the output assembly 3 refers to a final gear meshing with one of the first transmission gear 2.1 and the second transmission gear 2.2 located on the torque output side, and a spline for transmission connection with the electric wicket is provided on the final gear.

[0080] Specifically, the actuator is further provided with a circuit board 4 and a potentiometer 4.1 arranged on the circuit board 4, the output component 3 includes a coaxially driven output gear and a detection shaft 4.2, the output gear is meshed with the other of the first transmission gear 2.1 and the second transmission gear 2.2, and the detection shaft 4.2 is arranged through the potentiometer 4.1.

[0081] The position signal is fed back through the potentiometer 4.1. When encountering an obstacle, the stall current of motor 1 is collected and reverse motion is performed to realize the anti-pinch function. Among them, the potentiometer 4.1 is a resistive angle sensor, which can realize positioning control of any operating position within the range of 320°, with an angle control accuracy of 2%, so as to accurately position the electric small door.

[0082] Another object of the present invention is to provide a control method for an actuator, based on the damping torsion spring 2.3 of the above embodiment, to achieve slipping during the forced opening and forced closing process, when the small door is electrically opened or electrically closed:

[0083] Through the central control screen, remote control key, etc., send the small door electric opening or closing command to the BCM. After receiving the command, the BCM sends the small door actuator an opening or closing command to the small door actuator.

[0084] The small door actuator receives the action signal from the vehicle chip MCU, drives the motor to open or close the small door, and the angle sensor feeds back the current angle position to the MCU.

[0085] The angle sensor feeds back to the MCU that it has reached the end position, and the MCU determines that the motor current has reached the set stall current, and the MCU stops driving the motor;

[0086] The vehicle chip MCU uses the LIN signal to feedback whether the BCM small door is fully opened or closed.

[0087] During the above process, the small door actuator collects the angle signal of the angle sensor, and executes the jam return operation if it is jammed in the non-terminal area, thereby realizing the anti-pinch and fault return functions; when the vehicle circuit fails or the battery power is too low and the small door cannot be opened electrically, the small door can be forced open manually; 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, which provides the ultimate closing torque value for manually pushing the small door closed, and can also realize automatic closing.

[0088] like Fig.14 As shown, the above-mentioned MCU and BCM can be generally referred to as controllers of the actuator. As a further implementation of the motor and the controller, the motor has pins PIN1 and PIN2, and a PTC thermal protector is arranged between pin PIN1 and the motor. Pin PIN1 and pin PIN2 are both connected to the controller, wherein pin PIN1 and pin PIN2 are set to connect to 12V normal power input with a rated current of 0.2A.

[0089] During the work process:

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

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

[0092] The potentiometer has pins PIN3, PIN4 and PIN5 connected to the controller, pin PIN3 is set as the 5V voltage input side, pin PIN4 is set as the voltage output side, pin PIN5 is set as the 5V voltage output side, the resistance value of the resistor R1 connected to pins PIN3 to PIN5 is 10KΩ±30%, and 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 play clearance between the first transmission gear and the second transmission gear, and further reducing movement noise.

[0095] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A torsion spring damping actuator for a car charging door, characterized in that: include: A motor (1), a damping gear set (2) arranged on a torque transmission path, and an output assembly (3) arranged at the end of the torque transmission path, wherein the damping gear set (2) comprises: A first transmission gear (2.1) and a second transmission gear (2.2) are coaxially arranged, and a damping torsion spring (2.3) is arranged 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), 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 an output assembly (3); The damping torsion spring (2.3) changes in a first radial direction under the action of the opening actuating force and further cooperates with the second transmission gear (2.2), or the damping torsion spring (2.3) changes in a second radial direction under the action of the closing actuating force, the second radial direction being opposite to the first radial direction and departing from the cooperation direction with the second transmission gear (2.2).

2. The torsion spring damping actuator for a car charging door according to claim 1 is 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 a 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 is characterized in that: The output assembly (3) receives an opening actuation force from the outside and transmits a strong opening torque greater than a limit opening torque, and the second transmission gear (2.2) slips due to friction relative to the damping torsion spring (2.3) under the strong opening torque; The output assembly (3) receives the closing actuation force from the outside and transmits a closing push torque greater than the limit closing torque, the forced opening torque is greater than the closing push torque, and the second transmission gear (2.2) slips relative to the damping torsion spring (2.3) due to friction under the closing push torque.

4. The torsion spring damping actuator for a car charging door according to claim 1 is characterized in that: An installation 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 installation cavity (2.4) is defined by a 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 in the axial direction or radial direction, the first transmission gear (2.1) is provided with a fixed portion (2.5) for mating with the fixed end (2.31), and the second transmission gear (2.2) is provided with an abutment portion (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); a groove (2.6) for accommodating a damping torsion spring (2.3) is provided in the first transmission gear (2.1); an end of the damping torsion spring (2.3) is fixed in the groove (2.6); a connecting shaft (2.7) is placed in and penetrates the groove (2.6) on the second transmission gear (2.2); the damping torsion spring (2.3) is tightly clamped on the connecting shaft (2.7) by interference fit; and the damping torsion spring (2.3) rubs and slips relative to the connecting shaft (2.7) under the action of a strong opening torque or a 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); a groove (2.6) for accommodating a damping torsion spring (2.3) is provided in the second transmission gear (2.2); the damping torsion spring (2.3) is pressed against the inner wall of the groove (2.6) by interference fit; the first transmission gear (2.1) is provided with 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) rubs and slips relative to the inner wall of the groove (2.6) under the action of a strong opening torque or a push-closing torque.

8. 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); a groove (2.6) for accommodating a damping torsion spring (2.3) and a connecting shaft (2.7) extending axially in the groove (2.6) are provided in the second transmission gear (2.2); the damping torsion spring (2.3) is pressed against the outer wall of the connecting shaft (2.7) by interference fit; a supporting portion (8) facing the groove (2.6) is provided on the first transmission gear (2.1); one end of the damping torsion spring (2.3) has a fixed end (2.31) extending radially; the supporting portion (8) is provided with a fixing portion (2.5) for plugging the fixed end (2.31); the damping torsion spring (2.3) rubs and slips relative to the outer wall of the connecting shaft (2.7) under the action of a strong opening torque or a push-closing 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 in the axial and radial directions to form a fixed end (2.31), the fixed end (2.31) is inserted into the groove (2.6), and the groove (2.6) is provided with a limiting edge (2.61) abutting 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 assembly (3) comprises a coaxially driven output gear and a detection shaft (4.2), the output gear meshing with the other of the first transmission gear (2.1) and the second transmission gear (2.2), and the detection shaft (4.2) passing through the potentiometer (4.1); the actuator is also provided with a circuit board (4) and a potentiometer (4.1) arranged on the circuit board (4); A worm (5) is sleeved on the output shaft of the motor (1), the worm (5) is meshed with a double gear (6), and the double gear (6) is meshed with one of the first transmission gear (2.1) or the second transmission gear (2.2); Alternatively, a worm (5) is sleeved on the output shaft of the motor (1), the worm (5) is meshed with a double gear (6), the double gear (6) is also meshed with a reduction gear (7), and the reduction gear (7) is meshed with one of the first transmission gear (2.1) or the second transmission gear (2.2).

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