Double-damping clutch actuator for small electric door of automobile and operation method of double-damping clutch actuator

Abstract

The invention discloses an automobile electric small door double-damping clutch actuator and an operation method thereof.The automobile electric small door double-damping clutch actuator comprises a motor, a worm and gear assembly, a first gear assembly and a second gear assembly, each of the first gear assembly and the second gear assembly comprises two coaxially-arranged transmission units and a damping sleeve, and the damping sleeves are fixed to the transmission units on the input side; the second gear assembly is in interference fit with the transmission unit on the output side in the radial direction, the second gear assembly is connected to the small electric door, a one-way bearing is further arranged between the two transmission units of the second gear assembly, and the one-way bearing provides locking torque in the opening direction for the two transmission units of the second gear assembly. The two transmission units of the second gear assembly are allowed to rotate relative to each other in the closing direction, so that manual operation in the power losing and opening process is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to an automobile electric small door double damping clutch actuator and an operating method thereof. 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. 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] In addition, in the actuator in the prior art, usually only one clutch is provided, so the feel is the same whether the user is manually operating or forcibly opening the door in an unexpected situation such as a power outage. In order to ensure that the electric door is not thrown out during the driving of the vehicle, the user needs to apply a large force to exceed the limit torque of the clutch, which makes it difficult for the user to perform follow-up operations during the normal opening and closing of the actuator. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a dual-damping clutch actuator for an electric small door of an automobile.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] Automobile electric small door double damping clutch actuator, including:

[0008] a motor for providing driving torque, and a worm gear assembly, a first gear assembly and a second gear assembly arranged along a torque transmission path,

[0009] The first gear assembly and the second gear assembly each include two transmission units arranged coaxially, and a damping sleeve arranged between the two transmission units, the damping sleeve is fixed to the transmission unit on the input side, and is radially interference-fitted with the transmission unit on the output side, the second gear assembly is connected to the electric small door, and a one-way bearing is further arranged between the two transmission units of the second gear assembly, the one-way bearing provides a locking torque in the opening direction for the two transmission units of the second gear assembly, and allows the two transmission units of the second gear assembly to rotate relative to each other in the closing direction;

[0010] The first gear assembly provides a first overload torque through a damping sleeve, the second gear assembly provides a second overload torque less than the first overload torque through a damping sleeve, the locking torque is greater than the first overload torque, and the self-locking torque of the worm gear assembly is greater than the first overload torque;

[0011] The second gear assembly keeps the two transmission units and the damping sleeve relatively still in the opening direction through the one-way bearing, and transmits the manual opening torque of the first gear assembly greater than the first overload torque under the action of external force, so as to force the two transmission units of the first gear assembly to rotate relative to each other and disengage the transmission;

[0012] The second gear assembly transmits the electric closing torque in the electric closing direction through the damping sleeve therein, and bears the manual closing torque greater than the second overload torque under the action of external force, so as to force the two transmission units of the second gear assembly to rotate relative to each other and disengage the transmission. The manual closing torque is set to actuate the electric small door in the closing direction.

[0013] Furthermore, the transmission units on the input side all have a transmission cavity, and the transmission units on the output side all have a shaft portion, and the shaft portion is at least partially inserted into the transmission cavity. The damping sleeve is radially pressed into the transmission cavity on the circumferential surface, and the inner side surface of the damping sleeve is pre-tightened on the outer surface of the shaft portion, and a first overload torque is defined between the first damping sleeve and the gear shaft, and a second overload torque is defined between the second damping sleeve and the output shaft, and the one-way bearing is inserted into the transmission cavity of the second gear assembly.

[0014] Further, the first gear assembly comprises:

[0015] An input gear and a gear shaft that are coaxially plugged and arranged, and a first damping sleeve that is sleeved between the input gear and the gear shaft, wherein the input gear serves as an input side to bear torque, and the gear shaft serves as an output side to output torque, and the first damping sleeve maintains static friction with the gear shaft, and slides and rubs with the gear shaft after bearing a torque greater than a first overload torque;

[0016] The second gear assembly comprises:

[0017] An output gear and an output shaft are coaxially plugged in, and a second damping sleeve is sleeved between the output gear and the output shaft, the output gear serves as the input side, the output shaft serves as the output side to output torque, and the second damping sleeve maintains static friction with the output shaft, and after receiving a torque greater than the second overload torque in the closing direction, it slides and rubs with the output shaft, the one-way bearing is sleeved on the output shaft, and is axially upper-limited between the output gear and the output shaft.

[0018] Further, the damping sleeve includes an outer contour feature, and the outer contour feature is used to match the inner wall of the transmission unit on the input side and limit the relative rotation with the transmission unit on the input side in shape;

[0019] The damping sleeve also includes an elastic deformation portion protruding in the radial direction. The elastic deformation portion is arranged at intervals in the circumferential direction and has a pre-tensioned interference fit with the transmission unit on the output side, so that the transmission unit on the output side rotates relative to the damping sleeve when overloaded.

[0020] Furthermore, the damping sleeve is axially limited in the transmission cavity, or pre-tightened in the axial direction.

[0021] Furthermore, a first transmission cavity is defined inside the input gear, a first limiting portion is provided at one end of the first transmission cavity, a second limiting portion is provided at the other end of the gear shaft corresponding to the first transmission cavity, and the axial end face of the first damping sleeve is positioned between the first limiting portion and the second limiting portion.

[0022] Furthermore, a second transmission cavity is defined inside the input gear, a third limiting portion is provided at one end of the second transmission cavity, the one-way bearing abuts against the third limiting portion, the second damping sleeve abuts against the one-way bearing, and the actuator includes a shell, a fourth limiting portion abutting against the second damping sleeve is provided on the shell, and the fourth limiting portion is arranged corresponding to the other end of the second transmission cavity.

[0023] Furthermore, a detection shaft is provided at the end of the output shaft, a circuit board is provided in the actuator, a potentiometer is provided on the circuit board, and the detection device is arranged on the potentiometer.

[0024] Furthermore, it also includes a shell, a circuit board and a motor arranged in the shell, the motor is perpendicular to the axes of the first gear assembly and the second gear assembly, the circuit board is arranged in the same direction as the axial direction of the motor, and the circuit board respectively divides the first gear assembly, the second gear assembly and the worm gear assembly in their axial directions, the shell has a partition wall and a transmission notch arranged along the axial direction of the motor, the motor is horizontally placed on one side of the partition wall, the worm gear assembly is arranged at the transmission notch, and is respectively connected to the motor and the first gear assembly in transmission, the first gear assembly and the second gear assembly are arranged on the other side of the partition wall, and an electrical connection port electrically connected to the circuit board extends from the outer edge of the shell, and the electrical connection port is arranged in the same direction as the circuit board.

[0025] The present invention also provides an operating method for a friction clutch actuator applied to an automobile electric small door, comprising the following steps:

[0026] Electric opening:

[0027] A1, the actuator receives the opening signal, the motor starts to rotate in the opening direction and provides the rated torque;

[0028] A2, the motor actuates the worm gear assembly and transmits torque to the input gear, the input gear rotates together with the first damping sleeve, and drives the gear shaft to rotate through the static friction between the first damping sleeve and the gear shaft;

[0029] A3. The gear shaft drives the output gear to rotate. The output gear and the output shaft rotate synchronously under the locking torque of the one-way bearing. The second damping sleeve rotates synchronously with the output gear and the output shaft, and the electric small door is actuated to open.

[0030] A4, the electric door opens to the fully open position, and feedback is given on the position signal and the angle position of the output shaft, and then the actuator stops;

[0031] Manual opening:

[0032] B1, in the power-off state, manually pull the electric door and apply manual opening torque;

[0033] B2, the output gear and the output shaft rotate synchronously under the locking torque of the one-way bearing, and the second damping sleeve rotates synchronously with the output gear and the output shaft, the output gear transmits torque to the gear shaft, the gear shaft transmits a manual opening torque greater than the first overload torque to the first damping sleeve, at this time the gear shaft rotates relative to the second damping sleeve and generates sliding friction;

[0034] B3, the electric door is manually moved to the fully open position;

[0035] Electric closing:

[0036] C1, the actuator receives the closing signal and detects the angular position of the output shaft, the motor starts to rotate in the closing direction and provides the rated torque;

[0037] C2, the motor actuates the worm gear assembly and transmits torque to the input gear, the input gear rotates together with the first damping sleeve, and drives the gear shaft to rotate through the static friction between the first damping sleeve and the gear shaft;

[0038] C3, the gear shaft drives the output gear to rotate, the output gear and the output shaft rotate synchronously under the locking torque of the one-way bearing, and the second damping sleeve rotates synchronously with the output gear and the output shaft, and the electric small door is actuated to close;

[0039] C4, the electric door moves to the fully closed position, and feeds back the in-position signal and the angular position of the output shaft, and then the actuator stops.

[0040] Manual shutdown:

[0041] D1, manually apply a manual closing torque to the electric door in the closing direction;

[0042] D2, the one-way bearing releases the lock of the output gear and the output shaft in the closing direction, the manual closing torque is greater than the second overload torque, and overcomes the static friction between the second damping sleeve and the output shaft;

[0043] D3, under the action of manual closing torque, the output shaft rotates relative to the second damping sleeve and generates sliding friction;

[0044] D4, the actuator detects the angular position of the output shaft until the electric door moves to the fully closed position.

[0045] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0046] The present invention provides a worm gear assembly, a first gear assembly and a second gear assembly on a torque transmission path to achieve a deceleration effect, wherein the worm gear assembly provides a self-locking torque at the output end of the motor.

[0047] The first gear assembly provides a first overload torque through a first damping sleeve, the second gear assembly provides a second overload torque through a second damping sleeve, and the second gear assembly also provides a locking torque in the opening direction through a one-way bearing, so that the small door can be opened and closed by applying an external force by the user.

[0048] When manually opened, the one-way bearing fixes the second gear assembly as an integral component. At this time, the user needs to overcome the first overload torque to provide a greater operating feel, so that the transmission unit of the first gear assembly rotates relatively by friction. At this time, the electric small door is opened under the action of external force, so as to cope with the situation where the small door loses power;

[0049] When closing manually, the one-way bearing releases the locking torque. At this time, the user only needs to overcome the second overload torque of the second damping sleeve to provide a smaller operating feel, so that the second gear assembly transmission unit rotates relative to friction, thereby realizing manual operation closing during the closing process of the electric small door. In addition, the first damping sleeve and the second damping sleeve can be frictionally clutched in the opening direction and the closing direction, thereby avoiding stalling in the opening and closing directions and causing damage to the internal transmission structure.

[0050] The present invention provides static holding force on the gear stage through the damping sleeve, and the damping sleeve plays the role of transmitting torque, so that the coaxial transmission unit rotates synchronously, thereby providing driving force during normal electric opening and electric closing. In the state of power failure and power outage, the user can manually operate the electric small door. At this time, the torque of the manual actuation output final stage is applied to the output member. The user needs to apply a torque greater than the limit torque to make the friction clutch of the transmission gear stage to realize the forced opening of the connecting member;

[0051] This method also provides the actuator with sufficient holding force, which is helpful to prevent the connector from being thrown off during vehicle driving. In addition, during the normal opening and closing process of the connector, the user can also directly manually actuate the connector to achieve the abuse of follow-up operation;

[0052] In addition, during the friction clutch operation, the sliding friction of the damping sleeve can still provide the user with a certain hand feel. The present invention avoids the spring in the axial direction in the transmission system, thereby effectively avoiding axial collision during the process, and there is no abnormal sound caused by hard collision of concave and convex structures, thereby achieving a silent effect. In comparison, it also avoids wear between axial clutch components and fatigue of axial springs, thereby reducing factors causing clutch failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0054] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0055] Figure 3 is a cross-sectional schematic diagram of a second gear assembly of the present invention;

[0056] Figure 4 is an exploded schematic diagram of a second gear assembly of the present invention;

[0057] Figure 5 is a cross-sectional schematic diagram of a first gear assembly of the present invention;

[0058] Figure 6 is an exploded schematic diagram of a first gear assembly of the present invention;

[0059] Figure 7 It is a schematic diagram of the internal arrangement of the present invention;

[0060] Figure 8 It is a schematic diagram of the structure of the present invention after the shell is removed;

[0061] In the figure:

[0062] 1. Motor; 2. Worm gear assembly; 2.1. Worm; 2.2. Worm gear member; 3. First gear assembly; 3.1. Input gear; 3.2. Gear shaft; 3.3. First transmission cavity; 3.4. First stopper; 3.5. Second stopper; 3.6. Matching profile; 4. Second gear assembly; 4.1. Output gear; 4.2. Output shaft; 4.3. Second transmission cavity; 4.4. Third stopper; 4.5. Stopper concave portion; 5, one-way bearing; 6, first damping sleeve; 7, second damping sleeve; 8, outer contour feature; 8.1, special-shaped contour; 8.2, strip-shaped convex portion; 9, elastic deformation portion; 10, housing; 10.1, fourth limit portion; 10.2, partition wall; 10.3, transmission notch; 10.4, electrical connection port; 11, detection shaft; 12, circuit board; 13, potentiometer; 14, intermediate gear assembly; 15, C-shaped retaining ring; DETAILED DESCRIPTION

[0063] 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.

[0064] 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.

[0065] like Figure 1-8 As shown, the double damping clutch actuator for an electric small door of an automobile comprises:

[0066] A motor 1 for providing driving torque, and a worm gear 2.1 assembly 2, a first gear assembly 3 and a second gear assembly 4 arranged along a torque transmission path. Preferably, an intermediate gear assembly 14 is further arranged between the worm gear 2.1 assembly 2 and the first gear assembly 3, and the second gear assembly 4 is connected to the electric wicket;

[0067] The first gear assembly 3 and the second gear assembly 4 each include two coaxially arranged transmission units, and a damping sleeve arranged between the two transmission units, the damping sleeve is fixed to the transmission unit on the input side, and is radially interference fit in the transmission unit on the output side, wherein the damping sleeve is used to transmit torque between the two coaxial transmission units and provide friction clutching effect when subjected to overload torque, that is, during normal transmission, the two transmission units and the damping sleeve maintain relatively stationary synchronous rotation, and under overload or external force, the transmission unit on the output side rotates relative to the damping sleeve and generates sliding friction.

[0068] Among them, a one-way bearing 5 is also provided between the two transmission units of the second gear assembly 4, and the one-way bearing 5 provides a locking torque in the opening direction for the two transmission units of the second gear assembly 4. At this time, the one-way bearing 5 plays a locking role, and allows the two transmission units of the second gear assembly 4 to rotate relative to each other in the closing direction. At this time, the one-way bearing 5 plays a normal bearing role;

[0069] The first gear assembly 3 provides a first overload torque through the damping sleeve, the second gear assembly 4 provides a second overload torque less than the first overload torque through the damping sleeve, the locking torque is greater than the first overload torque, and the self-locking torque of the worm gear 2.1 assembly 2 is greater than the first overload torque;

[0070] Therefore, under the action of the one-way bearing 5, the second gear assembly 4 keeps the two transmission units and the damping sleeve relatively still in the opening direction, that is, the overall transmission of the second gear assembly 4 is realized. At this time, the damping sleeve therein does not produce a torque transmission effect. At this time, under the action of overload or external force, the second gear assembly 4 receives a manual opening torque greater than the first overload torque through the electric small door, and transmits it to the first gear assembly 3. At this time, the output side transmission unit of the first gear assembly 3 is forced to rotate relative to its damping sleeve and disengage from the transmission, and then the manual opening operation is performed in the power-off state;

[0071] The second gear assembly 4 transmits the electric closing torque in the electric closing direction through the damping sleeve therein.

[0072] In the closing direction, since the one-way bearing releases the locking effect, the user can apply a manual closing torque in the closing direction to the electric door. The manual closing torque is greater than the second overload torque to force the two transmission units of the second gear assembly 4 to rotate relative to each other and disengage the transmission, specifically, the output side transmission unit of the second gear assembly 4 rotates relative to its damping sleeve.

[0073] In some cases, if a manual opening force is applied in the closing direction to open the door, the above-mentioned friction clutch phenomenon will occur in the first gear assembly 3, thereby avoiding damage to the teeth in the transmission system. Thanks to the setting of the worm gear 2.1, it is ensured that the motor 1 shaft and the first gear assembly 3 do not rotate, ensuring the normal friction clutch of the first gear assembly 3. At the same time, the friction clutch effect of the damping sleeve is also reflected in the situation of obstacles and jams in the closing and opening path of the electric small door, so as to avoid damage to the electric small door.

[0074] As an implementation method for the cooperation between the transmission unit and the damping sleeve, the transmission unit on the input side has a transmission cavity, and the transmission unit on the output side has a shaft portion, which is used for transmitting torque. The shaft portion is at least partially inserted into the transmission cavity, and the damping sleeve is radially pressed into the transmission cavity on the circumferential surface. The inner surface of the damping sleeve is pre-tightened on the outer surface of the shaft portion. In this way, the damping sleeve is positioned in the transmission cavity, and the power is transmitted to the transmission unit on the output side by extrusion in the radial direction. Furthermore, the damping sleeve has a non-circular outer surface corresponding to the transmission cavity, and it maintains a fixed non-relative rotational relationship with the transmission unit on the input side through the outer surface to ensure that friction clutch is performed between the inner surface of the damping sleeve and the transmission unit on the output side.

[0075] In this embodiment, the damping sleeve has an incomplete deformation in the radial direction in the assembled state. Its purpose is to provide sufficient rated transmission torque. Under the premise of receiving the overload torque from the external force, the damping sleeve can generate friction clutch with the transmission unit on the output side through further elastic deformation. After the overload torque is eliminated, the damping sleeve again holds the transmission unit on the output side in a pre-tightened posture through its own elastic reset force. Compared with the separation and engagement of the concave and convex parts on the traditional shaft end face, the damping sleeve of the present invention effectively solves the clutch noise problem, reduces wear, and increases the service life of the actuator.

[0076] In other embodiments, different material surfaces may be provided on the shaft portion at the output side, or different material covers may be added to control the overload torque through the friction coefficient.

[0077] As a further embodiment of the first gear assembly 3 and the second gear assembly 4:

[0078] like Figure 5 and Figure 6 As shown, the first gear assembly 3 includes:

[0079] The input gear 3.1 and the gear shaft 3.2 are coaxially plugged together, and the first damping sleeve 6 is sleeved between the input gear 3.1 and the gear shaft 3.2.

[0080] The input gear 3.1 serves as a transmission unit on the input side to bear torque, and the gear shaft 3.2 serves as a transmission unit on the output side to output torque, and a first transmission cavity 3.3 with an open shaft end is opened on the inner side of the input gear 3.1, and the first damping sleeve 6 is inserted into the first transmission cavity 3.3 and keeps a fixed relative position with the input gear 3.1, and the first damping sleeve 6 and the gear shaft 3.2 maintain static friction through the first overload torque, and slide friction with the gear shaft 3.2 after bearing a torque greater than the first overload torque.

[0081] like Figure 3 and Figure 4 As shown, the second gear assembly 4 includes:

[0082] The output gear 4.1 and the output shaft 4.2 are coaxially plugged, and the second damping sleeve 7 is sleeved between the output gear 4.1 and the output shaft 4.2. The output gear 4.1 serves as a transmission unit on the input side, and the output shaft 4.2 serves as a transmission unit on the output side to output torque. A second transmission cavity 4.3 with an open shaft end is provided on the inner side of the output gear 4.1, and the second damping sleeve 7 is placed in the second transmission cavity 4.3 and maintains static friction with the output shaft 4.2, and slides with the output shaft 4.2 after receiving a torque greater than the second overload torque in the closing direction. The one-way bearing 5 is placed in the second transmission cavity 4.3 and sleeved on the output shaft 4.2, and is axially limited between the output gear 4.1 and the output shaft 4.2.

[0083] Through the above arrangement, due to the locking torque of the one-way bearing 5 in the opening direction and the unlocking effect in the closing direction, a first overload torque in the opening direction is defined between the first damping sleeve 6 and the gear shaft 3.2, and a second overload torque in the closing mode is defined between the second damping sleeve 7 and the output shaft 4.2.

[0084] As an example, the first overload torque is set to 6N·m and the second overload torque is set to 1.4N·m, so that the user can apply a smaller force in the closing direction during the closing process, and in the opening direction, a larger force needs to be applied to force the electric door to open. This is to prevent the electric door from being thrown away due to excessively small holding force in the opening direction during driving and turning of the vehicle. Therefore, the first overload torque is set to set the holding force required in the driving state to ensure the position stability of the electric door. At the same time, this setting method does not require additional locking actuators and emergency unlocking structures on the electric door, which simplifies the design of the electric door and reduces costs.

[0085] As a further embodiment of the damping sleeve, Figure 5 and Figure 6It can be seen that the damping sleeve is a circumferentially closed annular component, and its outer side has an outer contour feature 8, which is used to match the inner wall of the transmission unit on the input side. The outer contour feature 8 preferably has a non-circular surface and limits the relative rotation with the transmission unit on the input side in shape.

[0086] As an example, the outer contour feature 8 may be as follows Figure 4 The special-shaped contour 8.1 of the regular polygon and the arc surface shown in the figure, a matching contour 3.6 matching the special-shaped contour 8.1 is arranged in the transmission cavity, thereby providing a reliable holding force to prevent the damping sleeve and the transmission unit on the input side from rotating relative to each other. In the assembled state, the shaft of the transmission unit on the output side is inserted into the damping sleeve, thereby providing an extrusion amount for the outer contour feature 8 and the inner wall of the transmission cavity in the radial direction.

[0087] As an example, the outer contour feature 8 may also be as follows Figure 6 The strip-shaped protrusion 8.2 shown in the figure has a limiting concave portion 4.5 corresponding to the strip-shaped protrusion 8.2 in the corresponding transmission cavity.

[0088] The inner side of the damping sleeve is provided with an elastic deformation portion 9, which protrudes in the radial direction. The elastic deformation portion 9 is spaced apart in the circumferential direction and has a pre-tensioned interference fit with the transmission unit on the output side, preferably it is tightly clamped on the shaft of the transmission unit on the output side. The elastic deformation portion 9 maintains an interference fit with the shaft under normal conditions, and produces a certain amount of elastic deformation. Under the predetermined rated torque of electric opening and electric closing, the power can be normally transmitted to the electric small door, so that the electric small door performs electric opening and closing actions. After receiving the overload torque as mentioned above, the shaft rotates relative to the damping sleeve when overloaded. At this time, the elastic deformation portion 9 further produces elastic deformation and generates sliding friction, thereby realizing friction clutch.

[0089] Preferably, the elastic deformation portion 9 extends in the axial direction. In other embodiments, the elastic deformation portion 9 may also be a plurality of point-shaped protrusions in the radial direction, which are arranged at intervals in the axial direction and the circumferential direction.

[0090] Further references Figure 3 and Figure 5 As shown, in other embodiments, since the damping sleeve is installed and positioned in the transmission cavity which is open at one end, the damping sleeve maintains axial limitation in the transmission cavity, or, the damping sleeve can be pre-tightened in the axial direction by the installation and limiting structure of the damping sleeve, thereby ensuring the position stability of the damping sleeve in turn, and generating a radial component by the axial tightening of the damping sleeve, the purpose of which is to ensure that the damping sleeve can transmit the output side and the transmission unit on the output side when the rated torque is transmitted.

[0091] Specifically, a first transmission cavity 3.3 is defined inside the input gear 3.1, a radially extending first limit portion 3.4 is provided at one end of the first transmission cavity 3.3, a radially extending second limit portion 3.5 is provided at the other end of the gear shaft 3.2 corresponding to the first transmission cavity 3.3, an axial end face of the first damping sleeve 6 is positioned between the first limit portion 3.4 and the second limit portion 3.5, and an annular groove is also provided at the end of the gear shaft 3.2 corresponding to the first limit portion 3.4, a C-shaped retaining spring 15 is provided on the annular groove, and the C-shaped retaining spring 15 is pressed against the end face of the input gear 3.1.

[0092] Specifically, a second transmission chamber 4.3 is defined inside the input gear 3.1, a radially extending third limit portion 4.4 is provided at one end of the second transmission chamber 4.3, a one-way bearing 5 abuts against the third limit portion 4.4, a second damping sleeve 7 abuts against the one-way bearing 5, the actuator includes a housing 10, a fourth limit portion 10.1 abutting against the second damping sleeve 7 is provided on the housing 10, and the fourth limit portion 10.1 is arranged corresponding to the other end of the second transmission chamber 4.3.

[0093] Furthermore, a hole for the output shaft 4.2 to pass through is defined at the fourth limiting portion 10.1 of the housing 10, and the end of the output shaft 4.2 is preferably received in the hole, and a concave spline is provided at the end of the output shaft 4.2 to cooperate with the pivot of the electric door.

[0094] A sealing ring is also provided at the position of the hole, and the sealing ring abuts against the end of the output shaft 4.2.

[0095] In the above embodiment, the first damping sleeve 6 and the second damping sleeve 7 are limited in the axial direction by the axially opposite first limiting portion 3.4 and the second limiting portion 3.5, and the axially opposite third limiting portion 4.4 and the fourth limiting portion 10.1, and the first damping sleeve 6 and the second damping sleeve 7 are further pressed in the axial direction by the above limiting portions, thereby providing a radial component to ensure that the interference fit state of power transmission is returned after the friction clutch is completed.

[0096] Specifically, a detection shaft 11 is provided at the end of the output shaft 4.2, a circuit board 12 is provided in the actuator, a potentiometer 13 is provided on the circuit board 12, and the potentiometer 13 is provided after detection. The detection shaft 11 that rotates synchronously with the output shaft 4.2 is used to detect the angular position of the output shaft 4.2, so that the actuator can control the actuator's movement stroke according to the current angular position of the output shaft 4.2 after manual operation.

[0097] like Figure 7 and Figure 8As shown, specifically, it also includes a shell 10, a circuit board 12 and a motor 1 arranged in the shell 10, the motor 1 is perpendicular to the axes of the first gear assembly 3 and the second gear assembly 4, the circuit board 12 is arranged in the same direction as the axial direction of the motor 1, the circuit board 12 respectively divides the first gear assembly 3, the second gear assembly 4 and the worm gear 2.1 assembly 2 in their axial directions, the shell 10 has a partition wall 10.2 and a transmission notch 10.3 arranged along the axial direction of the motor 1, the motor 1 is horizontally placed on one side of the partition wall 10.2, the worm gear 2.1 assembly 2 is arranged at the transmission notch 10.3, and is respectively connected to the motor 1 and the first gear assembly 3, the first gear assembly 3 and the second gear assembly 4 are arranged on the other side of the partition wall 10.2, and an electrical connection port 10.4 electrically connected to the circuit board 12 is extended from the outer edge of the shell 10, and the electrical connection port 10.4 is arranged in the same direction as the circuit board 12.

[0098] Through the above improvements, the actuator housing 10 is divided into a U-shaped cavity, specifically, the cavity is divided into a motor 1 cavity and a gear cavity by a partition wall 10.2. The worm gear 2.1 assembly 2 includes a worm 2.1 arranged on the shaft of the motor 1, and a worm wheel component 2.2 arranged perpendicular to the motor 1. The worm wheel component 2.2 is arranged at the transmission notch 10.3. The intermediate gear assembly 14, the first gear assembly 3 and the second gear assembly 4 are arranged in the gear cavity toward the end away from the shaft of the motor 1 to define the engagement area between the circuit board 12 and the electrical connection port 10.4 on the side of the gear cavity adjacent to the shaft of the motor 1. In addition, the worm wheel component 2.2, the intermediate gear assembly 14 and the second gear assembly 4 are all double gear components in the axial direction. The circuit board 12 is separated at its axial position so that the circuit board 12 overlaps with the above-mentioned gear component in projection, thereby fully compressing the volume of the actuator and effectively utilizing its internal space.

[0099] An operating method for a friction clutch actuator applied to an electric small door of an automobile comprises the following steps:

[0100] Electric opening:

[0101] A1, the actuator receives the opening signal, and the motor 1 starts to rotate in the opening direction and provides the rated torque;

[0102] A2, the motor 1 actuates the worm gear 2.1 assembly 2 and transmits torque to the input gear 3.1, the input gear 3.1 rotates together with the first damping sleeve 6, and drives the gear shaft 3.2 to rotate through the static friction between the first damping sleeve 6 and the gear shaft 3.2;

[0103] A3, the gear shaft 3.2 drives the output gear 4.1 to rotate, and the output gear 4.1 and the output shaft 4.2 rotate synchronously under the locking torque of the one-way bearing 5, and the second damping sleeve 7 rotates synchronously with the output gear 4.1 and the output shaft 4.2, and actuates the electric small door to open;

[0104] A4, the electric door opens to the fully open position, and feedback is given of the in-position signal and the angle position of the output shaft 4.2, and then the actuator stops;

[0105] Manual opening:

[0106] B1, in the power-off state, manually pull the electric door and apply manual opening torque;

[0107] B2, the output gear 4.1 and the output shaft 4.2 rotate synchronously under the locking torque of the one-way bearing 5, and the second damping sleeve 7 rotates synchronously with the output gear 4.1 and the output shaft 4.2, the output gear 4.1 transmits torque to the gear shaft 3.2, the gear shaft 3.2 transmits a manual opening torque greater than the first overload torque to the first damping sleeve 6, at this time the gear shaft 3.2 rotates relative to the second damping sleeve 7 and generates sliding friction;

[0108] B3, the electric door is manually moved to the fully open position;

[0109] Electric closing:

[0110] C1, the actuator receives the closing signal and detects the angular position of the output shaft 4.2, the motor 1 starts to rotate in the closing direction and provides the rated torque;

[0111] C2, the motor 1 actuates the worm gear 2.1 assembly 2 and transmits torque to the input gear 3.1, the input gear 3.1 rotates together with the first damping sleeve 6, and drives the gear shaft 3.2 to rotate through the static friction between the first damping sleeve 6 and the gear shaft 3.2;

[0112] C3, the gear shaft 3.2 drives the output gear 4.1 to rotate, and the output gear 4.1 and the output shaft 4.2 rotate synchronously under the locking torque of the one-way bearing 5, and the second damping sleeve 7 rotates synchronously with the output gear 4.1 and the output shaft 4.2, and actuates the electric small door to close;

[0113] C4, the electric door moves to the fully closed position, and feeds back the in-position signal and the angle position of the output shaft 4.2, and then the actuator stops.

[0114] Manual shutdown:

[0115] D1, manually apply a manual closing torque to the electric door in the closing direction;

[0116] D2, the one-way bearing 5 releases the lock of the output gear 4.1 and the output shaft 4.2 in the closing direction, the manual closing torque is greater than the second overload torque, and overcomes the static friction between the second damping sleeve 7 and the output shaft 4.2;

[0117] D3, under the action of manual abuse torque, the output shaft 4.2 rotates relative to the second damping sleeve 7 and generates sliding friction;

[0118] D4, the actuator detects the angular position of the output shaft 4.2 until the electric door moves to the fully closed position.

[0119] Through the operating method of the present invention, the first damping sleeve 6 and the second damping sleeve 7 can be frictionally engaged in both the electric opening and electric closing directions when the motor 1 is blocked and the electric small door encounters an obstacle, so as to ensure the protection of the actuator and the electric small door. In addition, when the user manually opens the door forcibly in an emergency state, and when the user manually assists in closing the door during the closing process, different overload torques of the first damping sleeve 6 and the second damping sleeve 7 are used to provide different operating feels and friction clutches corresponding to manual operations. Under the premise of ensuring the holding force of the small door, damage to the electric small door during manual operation is prevented. In addition, friction clutch is used to achieve stepless rotation, provide a better operating feel, and there is no "clicking" noise during the friction clutch process.

[0120] 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. Automobile electric small door double damping clutch actuator, characterized in that: include: A motor (1) for providing a driving torque, and a worm gear (2.1) assembly (2), a first gear assembly (3) and a second gear assembly (4) arranged along a torque transmission path; The first gear assembly (3) and the second gear assembly (4) each comprise two transmission units arranged coaxially, and a damping sleeve arranged between the two transmission units, the damping sleeve being fixed to the transmission unit on the input side and being interference-fitted in the radial direction to the transmission unit on the output side, the second gear assembly (4) being connected to the electric small door, and a one-way bearing (5) being arranged between the two transmission units of the second gear assembly (4), the one-way bearing (5) providing a locking torque in the opening direction for the two transmission units of the second gear assembly (4), and allowing the two transmission units of the second gear assembly (4) to rotate relative to each other in the closing direction; The first gear assembly (3) provides a first overload torque through a damping sleeve, the second gear assembly (4) provides a second overload torque smaller than the first overload torque through the damping sleeve, the locking torque is greater than the first overload torque, and the self-locking torque of the worm gear (2.1) assembly (2) is greater than the first overload torque; The second gear assembly (4) maintains the two transmission units and the damping sleeve relatively still in the opening direction via the one-way bearing (5), and transmits a manual opening torque of the first gear assembly (3) greater than the first overload torque under the action of an external force, so as to force the two transmission units of the first gear assembly (3) to rotate relative to each other and disengage the transmission; The second gear assembly (4) transmits an electric closing torque in the electric closing direction through a damping sleeve therein, and bears a manual closing torque greater than the second overload torque under the action of an external force, so as to force the two transmission units of the second gear assembly (4) to rotate relative to each other and disengage the transmission, and the manual closing torque is set to actuate the electric small door in the closing direction.

2. The dual damping clutch actuator for electric small door of automobile according to claim 1, characterized in that: The transmission units on the input side all have a transmission cavity, and the transmission units on the output side all have a shaft portion, which is at least partially inserted into the transmission cavity. The damping sleeve is radially pressed into the transmission cavity on the circumferential surface, and the inner side surface of the damping sleeve is pre-tightened on the outer surface of the shaft portion.

3. The dual damping clutch actuator for electric small door of automobile according to claim 2 is characterized in that: The first gear assembly (3) comprises: An input gear (3.1) and a gear shaft (3.2) are coaxially plugged and arranged, and a first damping sleeve (6) is sleeved between the input gear (3.1) and the gear shaft (3.2), the input gear (3.1) serves as an input side to receive torque, the gear shaft (3.2) serves as an output side to output torque, and the first damping sleeve (6) maintains static friction with the gear shaft (3.2), and after receiving a torque greater than a first overload torque, it undergoes sliding friction with the gear shaft (3.2); The second gear assembly (4) comprises: An output gear (4.1) and an output shaft (4.2) are coaxially plugged together, and a second damping sleeve (7) sleeved between the output gear (4.1) and the output shaft (4.2); the output gear (4.1) serves as an input side, and the output shaft (4.2) serves as an output side to output torque, and the second damping sleeve (7) maintains static friction with the output shaft (4.2), and after receiving a torque greater than a second overload torque in a closing direction, slides in friction with the output shaft (4.2); the one-way bearing (5) is sleeved on the output shaft (4.2) and is axially upper-limited between the output gear (4.1) and the output shaft (4.2); A first overload torque is defined between the first damping sleeve (6) and the gear shaft (3.2), and a second overload torque is defined between the second damping sleeve (7) and the output shaft (4.2), and the one-way bearing (5) is placed in a transmission cavity of the second gear assembly (4).

4. The dual damping clutch actuator for electric small door of automobile according to claim 3 is characterized in that: The damping sleeve comprises an outer contour feature (8), and the outer contour feature (8) is used to match the inner wall of the transmission unit on the input side and to limit the relative rotation with the transmission unit on the input side in terms of shape; The damping sleeve also includes an elastic deformation portion (9) protruding in the radial direction. The elastic deformation portion (9) is arranged at intervals in the circumferential direction and is pre-tensioned with the transmission unit on the output side in an interference fit, so that the transmission unit on the output side rotates relative to the damping sleeve when overloaded.

5. The dual damping clutch actuator for electric small door of automobile according to claim 1, characterized in that: The damping sleeve is axially limited in the transmission cavity, or pre-tightened in the axial direction.

6. The dual damping clutch actuator for electric small door of automobile according to claim 1, characterized in that: A first transmission cavity (3.3) is defined inside the input gear (3.1), a first limiting portion (3.4) is provided at one end of the first transmission cavity (3.3), a second limiting portion (3.5) is provided at the other end of the gear shaft (3.2) corresponding to the first transmission cavity (3.3), and an axial end surface of the first damping sleeve (6) is positioned between the first limiting portion (3.4) and the second limiting portion (3.5).

7. The dual damping clutch actuator for electric small door of automobile according to claim 1, characterized in that: A second transmission chamber (4.3) is defined inside the input gear (3.1); a third limiting portion (4.4) is provided at one end of the second transmission chamber (4.3); the one-way bearing (5) abuts against the third limiting portion (4.4); the second damping sleeve (7) abuts against the one-way bearing (5); the actuator comprises a housing (10); a fourth limiting portion (10.1) abutting against the second damping sleeve (7) is provided on the housing (10); the fourth limiting portion (10.1) is provided corresponding to the other end of the second transmission chamber (4.3).

8. The dual damping clutch actuator for electric small door of automobile according to claim 1, characterized in that: A detection shaft (11) is provided at the end of the output shaft (4.2), a circuit board (12) is provided in the actuator, a potentiometer (13) is provided on the circuit board (12), and the detection is then arranged through the potentiometer (13).

9. The dual damping clutch actuator for electric small door of automobile according to claim 1, characterized in that: The invention also comprises a housing (10), a circuit board (12) arranged in the housing (10), the motor (1) being perpendicular to the axes of the first gear assembly (3) and the second gear assembly (4), the circuit board (12) being arranged in the same direction as the axial direction of the motor (1), the circuit board (12) respectively dividing the first gear assembly (3), the second gear assembly (4) and the worm gear (2.1) assembly (2) in the axial direction thereof, and the housing (10) having a partition wall (10.2) and a transmission notch (10.3) arranged along the axial direction of the motor (1) The motor (1) is horizontally placed on one side of the partition wall (10.2); the worm gear (2.1) assembly (2) is arranged at the transmission notch (10.3) and is respectively transmission-connected to the motor (1) and the first gear assembly (3); the first gear assembly (3) and the second gear assembly (4) are arranged on the other side of the partition wall (10.2); an electrical connection port (10.4) electrically connected to the circuit board (12) extends from the outer edge of the housing (10); the electrical connection port (10.4) is arranged in the same direction as the circuit board (12).

10. An operating method for a dual damping clutch actuator for an electric door of an automobile according to claim 3, characterized in that: The following steps are involved: Electric opening: A1, the actuator receives an opening signal, the motor (1) starts to rotate in the opening direction and provides the rated torque; A2, the motor (1) actuates the worm gear (2.1) assembly (2) and transmits torque to the input gear (3.1), the input gear (3.1) rotates together with the first damping sleeve (6), and drives the gear shaft (3.2) to rotate through the static friction between the first damping sleeve (6) and the gear shaft (3.2); A3, the gear shaft (3.2) drives the output gear (4.1) to rotate, the output gear (4.1) and the output shaft (4.2) rotate synchronously under the locking torque of the one-way bearing (5), and the second damping sleeve (7) rotates synchronously with the output gear (4.1) and the output shaft (4.2), and actuates the electric small door to open; A4, the electric door opens to the fully open position, and the position signal and the angle position of the output shaft (4.2) are fed back, and then the actuator stops; Manual opening: B1, in the power-off state, manually pull the electric door and apply manual opening torque; B2, the output gear (4.1) and the output shaft (4.2) rotate synchronously under the locking torque of the one-way bearing (5), and the second damping sleeve (7) rotates synchronously with the output gear (4.1) and the output shaft (4.2), the output gear (4.1) transmits torque to the gear shaft (3.2), the gear shaft (3.2) transmits a manual opening torque greater than the first overload torque to the first damping sleeve (6), and at this time the gear shaft (3.2) rotates relative to the second damping sleeve (7) and generates sliding friction; B3, the electric door is manually moved to the fully open position; Electric closing: C1, the actuator receives the closing signal and detects the angular position of the output shaft (4.2), the motor (1) starts to rotate in the closing direction and provides the rated torque; C2, the motor (1) actuates the worm gear (2.1) assembly (2) and transmits torque to the input gear (3.1), the input gear (3.1) rotates together with the first damping sleeve (6), and drives the gear shaft (3.2) to rotate through the static friction between the first damping sleeve (6) and the gear shaft (3.2); C3, the gear shaft (3.2) drives the output gear (4.1) to rotate, the output gear (4.1) and the output shaft (4.2) rotate synchronously under the locking torque of the one-way bearing (5), and the second damping sleeve (7) rotates synchronously with the output gear (4.1) and the output shaft (4.2), and actuates the electric small door to close; C4, the electric door moves to the fully closed position and feeds back the in-position signal and the angular position of the output shaft (4.2), and then the actuator stops. Manual shutdown: D1, manually apply a manual closing torque to the electric door in the closing direction; D2, the one-way bearing (5) releases the lock of the output gear (4.1) and the output shaft (4.2) in the closing direction, the manual closing torque is greater than the second overload torque, and overcomes the static friction between the second damping sleeve (7) and the output shaft (4.2); D3, under the action of manual closing torque, the output shaft (4.2) rotates relative to the second damping sleeve (7) and generates sliding friction; D4, the actuator detects the angular position of the output shaft (4.2) until the electric door moves to the fully closed position.

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