Friction type clutch actuator for small electric door of automobile

Abstract

The utility model discloses an automobile electric small door friction type clutch actuator which comprises a motor, an output final stage driven by the motor and a torque transmission structure arranged between the motor and the output final stage, and the torque transmission structure comprises at least one transmission gear stage. The transmission gear stage comprises an input component bearing the input torque of the motor and an output component coaxial with the input component, and the output component is connected to the output final stage; the transmission device further comprises a damping sleeve, the damping sleeve is tightly assembled between the input component and the output component in the radial direction, the damping sleeve has preset limit torque, and the transmission gear stages form transmission within the limit torque range. And the output member applies an actuating force exceeding the limit torque from the output final stage side to slip relative to the input member.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive parts, and particularly relates to a frictional clutch actuator for an automotive electric small door. Background Art

[0002] At present, for the electronic actuators used in the market, when the actuator is applied to vehicle components such as electric small doors that can be manually operated by users, generally, the actuator includes a motor and a gear transmission device connected to the motor.

[0003] In an existing vehicle actuator, in order to achieve transmission clutch, a clutch device is provided in the gear transmission device. For example, in a Chinese patent with the publication number CN118499380A, titled "Clutch", it includes two axially inserted gears and a shaft member, and a concave-convex engagement device is provided between the end faces of the two. By applying elastic pressure on one of them, the transmission state under normal conditions is ensured. When the motor is blocked, the gears and the shaft member are axially disengaged, and under the action of the elastic member and the transmission force, they rotate relative to each other, and at the same time, there is a "click-click" abnormal noise, which affects the user experience, and the surface wear of this structure is relatively large, which is not conducive to long-term use. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a frictional clutch actuator for an automotive electric small door.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] A frictional clutch actuator for an automotive electric small door, comprising:

[0007] A motor, an output final stage driven by the motor, and a torque transmission structure arranged between the motor and the output final stage. The torque transmission structure includes at least one transmission gear stage. The transmission gear stage includes an input member for receiving the input torque of the motor, and an output member coaxially arranged with the input member. The output member is connected to the output final stage.

[0008] It further includes a damping sleeve. The damping sleeve is tightly fitted between the input member and the output member in the radial direction, and the damping sleeve has a preset limit torque. The transmission gear stage constitutes transmission within the limit torque range; and when the output member applies a driving force exceeding the limit torque from the output final stage side, it slips relative to the input member.

[0009] Furthermore, the input member includes an external gear, the output member includes a shaft portion, and a cavity for placing the shaft portion and the damping sleeve is provided inside the external gear.

[0010] Further, the damping sleeve is fixedly arranged relative to the input member, and the damping sleeve and the input member are fixed and rotate synchronously by means of shape fit, and / or a fastener is provided between the damping sleeve and the input member.

[0011] Furthermore, the inner and outer sides of the fastener, the outer side of the damping sleeve, and the inner side of the input member are provided with matching shape-matching contours.

[0012] Furthermore, the inner surface of the damping sleeve is provided with a plurality of radial protrusions arranged at intervals, the radial protrusions are tightly embraced on the outer surface of the output member, and the radial protrusions are elastically arranged.

[0013] Furthermore, the input member is provided with a first limit portion corresponding to one end of the damping sleeve, the output member is provided with a second limit portion corresponding to the other end of the damping sleeve, and the transmission gear stage is provided with a fixing member for limiting axial movement of the input member and the output member.

[0014] Furthermore, the input member is fixedly connected to the output shaft of the motor, or the input member is drivingly connected to the output shaft of the motor, or a reduction gear stage is provided between the input member and the output shaft of the motor.

[0015] Furthermore, the output member is fixedly connected to the output final stage, or a transmission gear is meshed between the output member and the output final stage.

[0016] Furthermore, a worm gear assembly is provided between the motor and the input member, and the self-locking force of the worm gear assembly is greater than the limit torque of the damping sleeve.

[0017] Furthermore, it also includes a circuit board arranged in the actuator, the output final stage is provided with a shaft end of coaxial transmission, the circuit board is provided with a potentiometer corresponding to the shaft end, and the potentiometer is used to feed back the position signal of the output final stage.

[0018] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0019] The utility model provides static holding force on the transmission gear stage through the damping sleeve, and the damping sleeve plays the role of transmitting torque, so that the coaxial input member and output member rotate synchronously, thereby providing driving force during normal electric opening and electric closing. In the state of power shortage and power failure, the user can manually operate the connecting piece of the output final stage, and the connecting piece can also be an electric small door. At this time, the torque of the manually actuated output final stage is applied to the output member. The user needs to apply a torque greater than the limit torque to make the transmission gear stage slip, so as to realize the forced opening of the connecting piece.

[0020] This method also provides sufficient holding force for the actuator, which is beneficial to prevent the connecting piece from being thrown off during vehicle driving. In addition, during the normal opening and closing of the connecting piece, the user can directly manually actuating the connecting piece to achieve the operation of abuse follow-up;

[0021] In addition, during the slipping clutch operation, the sliding friction of the damping sleeve can still provide a certain feel for the user, and there is no abnormal noise of hard collision of the concave-convex structure during the process, achieving a silent effect. Brief Description of the Drawings

[0022] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0023] Figure 2 is a schematic diagram of the internal structure of the present utility model;

[0024] Figure 3 is a schematic diagram of the structure of the present utility model after removing the actuator housing;

[0025] Figure 4 is a cross-sectional view of the actuator of the present utility model;

[0026] Figure 5 is a cross-sectional view of the input member and the output member of the present utility model;

[0027] Figure 6 is an exploded view of the input member and the output member of the present utility model;

[0028] In the figure: 1. Motor; 2. Output final stage; 3. Transmission gear stage;

[0029] 4. Input member; 4.1 Outer gear; 4.2 Concave cavity; 4.3 First limiting portion;

[0030] 5. Output member; 5.1 Shaft portion; 5.2 Second limiting portion;

[0031] 6. Damping sleeve; 6.1 Radial convex portion;

[0032] 7. Fastener;

[0033] 8. Shape matching profile; 9. Fixing member; 10. Worm and worm gear assembly; 11. Transmission gear; 11.1 Gear shaft; 12. Circuit board; 13. Potentiometer; 14. Shaft end; Detailed Embodiments

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0035] It should be understood that although terms such as upper, middle, lower, top, one 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, rather than to define any directional or sequential limitations.

[0036] As Figure 1-6 shown, an automotive electric small door friction clutch actuator includes:

[0037] A motor 1, an output final stage 2 driven by the motor 1, and a torque transmission structure disposed between the motor 1 and the output final stage 2. The torque transmission structure includes at least one transmission gear stage 3. The transmission gear stage 3 includes an input member 4 that receives the input torque of the motor 1, and an output member 5 coaxially disposed with the input member 4. The output member 5 is connected to the output final stage 2;

[0038] It further includes a damping sleeve 6. The damping sleeve 6 is tightly fitted between the input member 4 and the output member 5 in the radial direction, and the damping sleeve 6 has a preset limit torque. The transmission gear stage 3 constitutes a transmission within the limit torque range; and the output member 5 slips relative to the input member 4 when a driving force exceeding the limit torque is applied from the output final stage 2 side.

[0039] In most cases, the driving force exceeding the limit torque mainly comes from the external force of the user's manual operation. For example, in the power-off state, the user needs to manually open the electric small door. At this time, due to the preset limit torque of the damping sleeve 6, the electric small door can be manually opened. In some other cases, this setting method of the transmission gear stage 3 also allows the user to actuate the electric small door during the opening or closing process of the electric small door, such as manually operating to close or open. Of course, it also allows the user to stop the electric small door when it is electrically opened or closed, so that it remains in the current position. Correspondingly, in some other cases, when the electric small door is blocked, the electric small door can also frictionally slip under the action of the damping sleeve 6, thereby preventing damage to the electric small door.

[0040] In this embodiment, the damping sleeve 6 is preferably fixed relative to the input member 4, and under the action of an external driving force on the electric small door, the output member 5 slips relative to the damping sleeve 6.

[0041] As Figure 5As shown in the figure, specifically, the input member 4 includes an external gear 4.1, and the output member 5 includes a shaft portion 5.1. An inner cavity 4.2 for inserting the shaft portion 5.1 and the damping sleeve 6 is provided inside the external gear 4.1. The shaft portion 5.1 is inserted into the inner cavity 4.2, the damping sleeve 6 is placed in the inner cavity 4.2 and sleeved on the shaft portion 5.1 of the output member 5. The outer side of the damping sleeve 6 rotates synchronously with the output member 5, while the inner side of the damping sleeve 6 is in a pre-tensioned state under normal conditions to achieve synchronous rotation of the output member 5 and the input member 4 through static friction. Under the action of an external force, when the damping sleeve 6 bears a torque greater than its preset limit torque, the shaft portion 5.1 of the output member 5 slips relative to the damping sleeve 6 in the form of sliding friction. During this process, the sliding friction does not generate a "clicking" noise, realizing a silent friction clutch between the input member 4 and the output member 5.

[0042] Optionally, the output member 5 further includes an output portion, which can be the output end of an actuator or one of the gear stages in the torque transmission path of the actuator.

[0043] Optionally, the input member 4 is directly fixedly connected to the output shaft of the motor 1, or the input member 4 is indirectly drivingly connected to the output shaft of the motor 1, or a reduction gear stage is provided between the input member 4 and the output shaft of the motor 1. The reduction gear stage is preferably a worm and worm gear assembly 10 to provide sufficient self-locking force so that the motor 1 shaft will not rotate when the electric small door is actuated by an external force.

[0044] Further referring to Figure 5 , specifically, the damping sleeve 6 is fixedly arranged relative to the input member 4, and the damping sleeve 6 and the input member 4 are fixed and rotate synchronously through a form-fit manner, and / or a fastener 7 is provided between the damping sleeve 6 and the input member 4.

[0045] In some embodiments, the outer wall of the damping sleeve 6 is directly joined to the inner wall of the inner cavity 4.2 of the input member 4 and is matched in a non-circular shape profile to achieve anti-rotation between the two.

[0046] Referring to Figure 6 As shown, in other embodiments, a fastener 7 is provided inside the inner cavity 4.2 of the input member 4. The inner and outer profiles of the fastener 7 match the inner wall profile of the inner cavity 4.2 of the input member 4 and the outer wall profile of the damping sleeve 6, and all are matched in a non-circular shape profile to achieve anti-rotation among the three. This setting method enables the friction coefficient between the inner side of the input member 4 and the outer wall of the damping sleeve 6 to be adjusted according to the replacement of the fastener 7. In addition, the interference amount of the damping sleeve 6 can be adjusted by adjusting the wall thickness of the fastener 7, and further the limit torque of the damping sleeve 6 can be finely adjusted.

[0047] The fastener 7 is preferably an annular metal sleeve.

[0048] In the above embodiment, the non-circular contour specifically refers to a polygon, but it may also be any other contour that has a rotation-stopping effect.

[0049] As a further embodiment of the cooperation between the damping sleeve 6 and the input member 4, the inner surface of the damping sleeve 6 is provided with a plurality of radial protrusions 6.1 arranged at intervals, the radial protrusions 6.1 are tightly embraced on the outer surface of the output member 5, and the radial protrusions 6.1 are elastically arranged, and the radial protrusions 6.1 extend in the axial direction of the damping sleeve 6 and are spaced apart in the circumferential direction, and the radial protrusions 6.1 cooperate with the shaft portion 5.1 of the output shaft in an interference sleeve manner, and the radial protrusions 6.1 are partially deformed due to the interference fit under normal conditions, thereby tightly embrace the shaft portion 5.1 of the output member 5 and rotate synchronously with the output member 5, and after receiving the limit torque, the radial protrusions 6.1 are further deformed to achieve sliding friction with the output member 5, thereby achieving transmission disconnection, and after the limit torque is eliminated, the radial protrusions 6.1 return to the local deformation under normal conditions and have an interference fit with the output member 5;

[0050] As a further embodiment of the cooperation among the input member 4, the output member 5, the damping sleeve 6 and the fastener 7, the input member 4 is provided with a first limit portion 4.3 corresponding to one end of the damping sleeve 6, the output member 5 is provided with a second limit portion 5.2 corresponding to the other end of the damping sleeve 6, and the transmission gear stage 3 is provided with a fixing member 9 for limiting the axial movement of the input member 4 and the output member 5, wherein the fastener 7 and the damping sleeve 6 are limited between the first limit portion 4.3 and the second limit portion 5.2, and the first limit portion 4.3 and the second limit portion 5.2 are provided. The parts 5.2 are radially extended parts relative to the concave cavity 4.2, the fixing member 9 specifically refers to a retaining spring, the shaft part 5.1 of the output member 5 extends out of the concave cavity 4.2, and a retaining groove is provided at a position adjacent to the concave cavity 4.2, and the retaining groove is engaged in the retaining groove, so that the input member 4, the output member 5, the damping sleeve 6 and the fastener 7 are fixed as a whole in the form of a double gear. Within the preset limit torque range, the transmission gear stage 3 can transmit torque normally, and after exceeding the limit torque, the output member 5 rubs and slips relative to the damping sleeve 6.

[0051] Specifically, the output member 5 is fixedly connected to the output final stage 2 of the actuator, that is, the output member 5 is coaxial with the output final stage 2, or a transmission gear 11 is provided between the output member 5 and the output final stage 2, and the transmission gear 11 preferably has a coaxial gear shaft 11.1, the transmission gear 11 is meshed with the output member 5, and the gear shaft 11.1 is pivotally connected to the electric wicket through a spline.

[0052] Specifically, a worm and worm gear assembly 10 is provided between the motor 1 and the input member 4. The worm and worm gear assembly 10 meshes with the input member 4, and the self-locking force of the worm and worm gear is greater than the ultimate torque of the damping sleeve 6 to prevent the rotation of the input member 4 when the electric small door is actuated by an external force.

[0053] Specifically, it further includes a circuit board 12 disposed in the actuator. An end shaft 14 for coaxial transmission is provided on the output final stage 2. A potentiometer 13 is provided on the circuit board 12 corresponding to the end shaft 14. The potentiometer 13 is used to feedback the position signal of the output final stage 2. When an obstacle is encountered, the stall current of the motor 1 is collected and a reverse movement is performed to achieve the anti-pinch function.

[0054] This specific embodiment is only an explanation of the present invention and does not limit the present invention. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A friction clutch actuator for an electric small door of an automobile, characterized in that, Comprising: A motor (1), an output final stage (2) driven by the motor (1), and a torque transmission structure disposed between the motor (1) and the output final stage (2), the torque transmission structure including at least one transmission gear stage (3), the transmission gear stage (3) including an input member (4) for receiving the input torque of the motor (1), and an output member (5) disposed coaxially with the input member (4), the output member (5) being connected to the output final stage (2); Further including a damping sleeve (6), the damping sleeve (6) being tightly fitted radially between the input member (4) and the output member (5), and the damping sleeve (6) having a preset limit torque, the transmission gear stage (3) constituting a transmission within the limit torque range; and the output member (5) slipping relative to the input member (4) when applying a driving force exceeding the limit torque from the output final stage (2) side.

2. The friction clutch actuator for the electric small door of an automobile according to claim 1, characterized in that: The input member (4) includes an external gear (4.1), the output member (5) includes a shaft portion (5.1), and a cavity (4.2) for placing the shaft portion (5.1) and the damping sleeve (6) is provided inside the external gear (4.1).

3. The friction clutch actuator for the electric small door of an automobile according to claim 1 or 2, characterized in that: The damping sleeve (6) is fixedly disposed relative to the input member (4), and the damping sleeve (6) and the input member (4) are fixed and rotated synchronously by a form-fit manner, and / or a fastener (7) is provided between the damping sleeve (6) and the input member (4).

4. The friction clutch actuator for the electric small door of an automobile according to claim 3, characterized in that: Matched form-fit profiles (8) are provided on the inner and outer sides of the fastener (7), the outer side of the damping sleeve (6), and the inner side of the input member (4).

5. A frictional clutch actuator for an electric small door of an automobile according to claim 1, characterized in that: A plurality of radially protruding portions (6.1) are provided at intervals on the inner surface of the damping sleeve (6), the radially protruding portions (6.1) tightly holding the outer surface of the output member (5), and the radially protruding portions (6.1) are elastically arranged.

6. The friction clutch actuator for an electric small door of an automobile according to claim 3, characterized in that: A first limiting portion (4.3) corresponding to one end of the damping sleeve (6) is provided on the input member (4), a second limiting portion (5.2) corresponding to the other end of the damping sleeve (6) is provided on the output member (5), and a fixing member (9) for restricting the axial movement of the input member (4) and the output member (5) is provided on the transmission gear stage (3).

7. A frictional clutch actuator for an electric small door of an automobile according to claim 1, characterized in that: The input member (4) is fixedly connected to the output shaft of the motor (1), or the input member (4) is in transmission connection with the output shaft of the motor (1), or a reduction gear stage is provided between the input member (4) and the output shaft of the motor (1).

8. A frictional clutch actuator for an electric small door of an automobile according to claim 1, characterized in that: The output member (5) is fixedly connected to the output final stage (2), or a transmission gear (11) is engaged between the output member (5) and the output final stage (2).

9. The friction clutch actuator for the electric small door of an automobile according to claim 1, wherein: A worm and worm gear assembly (10) is provided between the motor (1) and the input member (4), and the self-locking force of the worm and worm gear assembly (10) is greater than the limit torque of the damping sleeve (6).

10. The friction clutch actuator for an electric small door of an automobile according to claim 1, characterized in that: Further including a circuit board (12) disposed inside the actuator, a shaft end (14) for coaxial transmission is provided on the output final stage (2), and a potentiometer (13) corresponding to the shaft end (14) is provided on the circuit board (12), and the potentiometer (13) is used to feedback the position signal of the output final stage (2).

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