Automobile electronic rearview mirror actuator

Abstract

The utility model discloses an automobile electronic rearview mirror actuator which comprises an upper shell, a lower shell, a built-in driving assembly and a built-in clutch output assembly, the driving assembly comprises a motor, and the motor is provided with a motor output gear; the embedded gear shaft is meshed with the motor output gear through a stepped transmission gear; the main driving gear is meshed with the embedded gear shaft; the clutch output assembly comprises a clutch clamping cover which is arranged on the main driving gear in a clamping mode. The clutch shaft sleeve is positioned between the clutch clamping cover and the main driving gear; and the output shaft is axially and fixedly connected with the clutch shaft sleeve through a key groove. According to the actuator, the space occupied by the rearview mirror after the whole vehicle is parked is reduced, the gear transmission loss is reduced, the transmission rate is improved, and the whole operation is more stable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electronic actuator, concretely relates to an automobile electronic rearview mirror actuator. BACKGROUND

[0002] The automobile electronic rearview mirror actuator is a device for adjusting the automobile rearview mirror, which mainly comprises a driving assembly, an electric signal assembly and an execution assembly, and when working, the driving assembly generates driving force through the electric signal control, and the driving force is transferred to the execution assembly through a transmission device and drives the execution assembly to move mechanically, so that the automobile rearview mirror folding is completed.

[0003] The technical scheme of the existing electronic rearview mirror folding actuator is as follows:

[0004] 1) Transmission chain:

[0005] Scheme: two-stage worm gear transmission, worm gear teeth are metal materials,

[0006] Disadvantages:

[0007] a. Low forward driving transmission efficiency, high energy consumption; high product cost, overall uneconomical.

[0008] b. Poor reverse driving efficiency will be self-locking, when the rearview mirror is folded by external force (such as manual opening or closing under the condition of power failure or collision with other vehicles), it is easy to cause damage to the transmission chain, resulting in maintenance cost.

[0009] 2) Real-time position monitoring

[0010] Scheme: no real-time angle feedback, that is, during the opening and closing process of the rearview mirror, only the hard stop of the full opening and closing position is provided, such as the stop of the mechanism, combined with the current steep rise of the driving motor to determine whether the opening and closing are in place.

[0011] Disadvantages:

[0012] a. Each opening and closing needs to use the motor to block the rotation, which requires high bearing and durability of the overall mechanism, and the energy consumption is also high.

[0013] b. When there is an obstacle, it is easy to cause position misjudgment, such as insufficient opening angle.

[0014] 3) Communication mode

[0015] Scheme: only power hardwire, opening and closing are executed by the vehicle body ECU.

[0016] Disadvantages:

[0017] a. No initial position and opening angle self-learning function.

[0018] 4) IP protection

[0019] Scheme: the upper and lower shells are usually welded by ultrasonic waves, but the output shaft is radially without sealing.

[0020] Disadvantages: the rearview mirror driver is arranged in the outer cover, but there is still a gap between the rotating arm and the stationary arm, and the whole is exposed to the air environment, and water vapor and dust still have the probability of invading the actuator, which brings challenges to the function and performance of the driver.

[0021] The purpose of the electronic rearview mirror actuator is to reduce the space occupied by the rearview mirror after parking, reduce the loss of gear transmission, improve the transmission rate, thereby reducing the maintenance cost in the later period, improve the accuracy of the movement angle of the rearview mirror, use ultrasonic welding technology, use different sealing technologies in different parts, reduce the exposure of the whole structure in the air environment, water vapor and dust, and prolong the service life.

[0022] Whether in the early manufacturing production or in the later maintenance, the cost can be reduced and the economic benefit can be improved. Content of the utility model

[0023] Therefore, the technical problem to be solved by the utility model is to provide an automobile electronic rearview mirror actuator, which avoids the trouble of low transmission efficiency and poor accuracy in the running process of the previous actuator.

[0024] In order to solve the above technical problem, the utility model discloses an automobile electronic rearview mirror actuator, which comprises an upper shell, a lower shell and a driving assembly and a clutch output assembly located between the upper shell and the lower shell, wherein the driving assembly comprises:

[0025] A motor, the motor has a motor output gear;

[0026] An embedded gear shaft, the embedded gear shaft has a front stepped gear part and a rear stepped gear part which are axially fixed to a metal shaft, and the front stepped gear part is engaged with the motor output gear through a stepped transmission gear;

[0027] A main drive gear, the main drive gear is engaged with the rear stepped gear part, and the main drive gear has a containing groove on the side surface;

[0028] The clutch output assembly comprises:

[0029] A clutch cover, the clutch cover is clamped in the containing groove;

[0030] A clutch shaft sleeve, the clutch shaft sleeve is located between the clutch cover and the main drive gear;

[0031] An output shaft, the output shaft is axially fixed to the clutch shaft sleeve through a key groove, the upper end of the output shaft is pressed against the upper shell through a compression spring, and the lower end of the output shaft penetrates through the lower shell and is connected to an output panel;

[0032] The slide platform ring is fixed to the inner wall of the lower shell and is penetrated by the output shaft.

[0033] According to an embodiment of the present application, the output shaft outer ring has a plurality of guide blocks that press against the slide platform ring, and the slide platform ring is provided with a plurality of arc bosses facing the guide blocks, and the output shaft is rotated to make the guide blocks press against or stagger with the arc bosses.

[0034] According to an embodiment of the present application, a wave spring is arranged between the clutch shaft sleeve and the clutch cover, and the clutch gasket is arranged on the wave spring.

[0035] According to an embodiment of the present application, the front stepped tooth portion and the rear stepped tooth portion are formed on the metal shaft by overmolding, the metal shaft is axially knurled, and the two gears are fixedly connected.

[0036] According to an embodiment of the present application, the accommodation groove surface and the clutch shaft sleeve are matched by convex and concave key grooves to provide clutch effect.

[0037] According to an embodiment of the present application, the slide platform ring is embedded and fixed by hot riveting in the lower shell to avoid abnormal noise caused by movement.

[0038] According to an embodiment of the present application, a sealing ring is arranged between the lower end of the output shaft and the lower shell to strengthen the sealing.

[0039] According to an embodiment of the present application, the upper shell and the lower shell are ultrasonically welded to have good sealing performance.

[0040] According to an embodiment of the present application, a Hall module is further arranged between the upper shell and the lower shell to provide real-time monitoring.

[0041] Compared with the prior art, the present application can obtain the following technical effects:

[0042] The motor is rotated to drive the motor output gear, the stepped gear, the embedded gear shaft, the main drive gear, and the clutch module are sequentially meshed, the clutch module is directly connected to the output surface, and the motor is positively rotated and reversely rotated to realize the unfolding and folding of the rearview mirror, the forward driving transmission efficiency is improved, the energy consumption is reduced, the product cost is low, and better economic benefits are obtained.

[0043] Of course, any product implementing the present application does not necessarily need to achieve all the technical effects described above. BRIEF DESCRIPTION OF DRAWINGS

[0044] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their description serve to explain the present application. They do not constitute an inappropriate limitation on the present application. In the drawings:

[0045] Figure 1 is an internal schematic diagram of the automobile electronic rearview mirror actuator of the embodiment of the present application;

[0046] Figure 2 is an exploded view of the automobile electronic rearview mirror actuator of the embodiment of the present application;

[0047] Figure 3 is an exploded view of the clutch output assembly of the embodiment of the present application;

[0048] Figure 4 is an installation cross-sectional view of the clutch output assembly and the upper shell of the embodiment of the present application;

[0049] Figure 5 is an installation exploded view of the clutch output assembly and the lower shell of the embodiment of the present application.

[0050] Reference signs

[0051] Upper shell 11, lower shell 12, motor 21, motor output gear 22, stepped transmission gear 23, embedded gear shaft 24, main drive gear 25, clutch cover 31, clutch shaft sleeve 32, output shaft 33, compression spring 34, output panel 35, sliding table ring 36, guide block 41, radian boss 42, wave spring 51, clutch washer 52, sealing ring 60, washer 70, bolt 80, Hall module 90. DETAILED DESCRIPTION

[0052] The implementation of the present application will be described in detail below with reference to the drawings and embodiments, so that the realization process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented.

[0053] Please refer to Figures 1 to 5 , Figure 1 is an internal schematic diagram of the automobile electronic rearview mirror actuator of the embodiment of the present application; Figure 2 is an exploded view of the automobile electronic rearview mirror actuator of the embodiment of the present application; Figure 3 is an exploded view of the clutch output assembly of the embodiment of the present application; Figure 4 is an installation cross-sectional view of the clutch output assembly and the upper shell of the embodiment of the present application; Figure 5 is an installation exploded view of the clutch output assembly and the lower shell of the embodiment of the present application.

[0054] As shown in the figure, an automobile electronic rearview mirror actuator comprises an upper shell 11, a lower shell 12, and a driving assembly and a clutch output assembly between the upper shell 11 and the lower shell 12, wherein the upper shell 11 and the lower shell 12 form a main body shell, the clutch output assembly is radially increased with dynamic sealing, and glue sealing is added at the motor external circuit. The gap between the rotating arm and the stationary arm can be effectively eliminated, the contact with the air environment is reduced, the invasion of water vapor and dust into the actuator is prevented, the function and performance of the driver are guaranteed, and the service life is prolonged.

[0055] In detail, the driving assembly comprises a motor 21, the motor 21 having a motor output gear 22; an embedded gear shaft 24, the embedded gear shaft 24 having a front stepped gear part and a rear stepped gear part axially fixedly connected by a metal shaft, the front stepped gear part being engaged with the motor output gear through a stepped transmission gear 23; and a main drive gear 25, the main drive gear 25 being engaged with the rear stepped gear part, and the main drive gear 25 having a containing groove on the side surface.

[0056] The clutch output assembly comprises a clutch cover 31 clamped in the containing groove; a clutch shaft sleeve 32 between the clutch cover 31 and the main drive gear 25, the surface of the containing groove being matched with the clutch shaft sleeve 32 through a convex-concave key groove; an output shaft 33 axially fixedly connected with the clutch shaft sleeve 32 through a key groove, the upper end of the output shaft 33 being pressed against the upper shell 12 through a compression spring 34, and the lower end of the output shaft 33 being connected to an output panel 35 through the lower shell 11; and a sliding table ring 36 fixed to the inner wall of the lower shell 12 and penetrated by the output shaft 33. A wave spring 51 is arranged between the clutch shaft sleeve 32 and the clutch cover 31, and a clutch washer 52 is arranged on the wave spring 51.

[0057] In the embodiment, the motor 21 rotates to drive the motor output gear 22, the stepped transmission gear 23, the embedded gear shaft 24, and the main drive gear 25 are sequentially engaged, and finally the clutch output assembly is directly connected to the output panel 35 to rotate, the output panel 35 is an action surface, the output shaft 33 and the rearview mirror stationary base are connected by bolts 80, and the actuator body is fixed with the rearview mirror rotating base. The motor 21 can drive the rearview mirror rotating base to perform opening and closing actions by forward and reverse rotation, that is, the motor 21 can realize the unfolding and folding of the rearview mirror by forward and reverse rotation.

[0058] In the clutch output assembly, the clutch cover 31 is clamped on the main drive gear 25, the main drive gear 25 and the clutch sleeve 32 have convex-concave matching features, the clutch sleeve 32 and the output shaft 33 are axially fixed and axially slidable, the wave spring 51 and the clutch washer 52 are arranged between the clutch sleeve 32 and the clutch cover 31, the wave spring 51 is preloaded, and the clutch sleeve 32 is pressed on the main drive gear 25, so that the convex-concave features of the two are embedded and can transmit power.

[0059] The outer circle of the output shaft 33 has a plurality of guide blocks 41 pressing against the slide table ring 36, the slide table ring 36 is provided with a plurality of arc bosses 45 facing the guide blocks 41, and the output shaft 33 is rotated to press or stagger the guide blocks 41 and the arc bosses 45. In short, the slide table ring 36 is arranged between the output shaft 33 and the lower shell 12, and when the output shaft 33 starts to rotate, under the action of the top compression spring 34, it first slides from the protruding part of the slide table ring 36, i.e. the arc boss 45, to the bottom plane. This action reflects on the rearview mirror that the output shaft 33 does not move, and the driver body drives the rearview mirror rotating part to lift up, which can avoid the sealing pad between the rotating part and the fixed part from being rubbed during rotation.

[0060] Principle of clutch output assembly:

[0061] The clutch sleeve 32 is a conventional clutch shaft, which is axially fixed with the output shaft 33 through a key groove. When the output shaft 33 is blocked by external force and cannot rotate normally, the clutch sleeve 32 will also be locked, but the main drive gear 25 still has a driving torque to drive the clutch sleeve 32 under the action of the motor 21 and the entire transmission chain. For the motor 21, it is a blocked working condition. To avoid long-term blocking from causing the motor 21 to burn out, in addition to software that can turn off the driver through an algorithm, a mechanism can also be selected for protection. That is, the concave-convex structure between the main drive gear 25 and the clutch sleeve 32 has an inclination. When the clutch sleeve 32 is locked by external force, the main drive gear 25 is driven by the motor 21 to overcome the spring counterforce of the clutch sleeve 32 and forcibly press the clutch sleeve 32 away from a certain height. The original concave-convex fit is changed to top face contact. At this time, the main drive gear 25 can continue to rotate under the drive of the motor 21 until it falls into the next concave groove fit and repeats the above steps. The above is the basic principle of the clutch action. However, the use scene of this clutch is more applied to the scene where the motor 21 is not powered, the output shaft 33 is driven by external force, and the main drive gear 25 is indirectly driven. Due to the worm and helical gears and the staggered teeth in the entire transmission chain, the reverse driving efficiency is low and has a self-locking effect. The external force may be much higher than the positive driving output torque, which may cause damage to the transmission chain. The clutch can play a protective role in this scene, allowing the clutch shaft and the main drive gear 25 to produce a similar “slip” phenomenon, cutting off the transmission chain, and thus playing a protective role. One key point is the setting of the clutch spring counterforce, which is the upper limit of the positive driving capacity of the mechanism and is also the upper limit of the reverse slip. In addition, the metal clutch washer 52 can ensure that the wave spring 51 can slide circumferentially on the washer when the clutch is working, avoiding direct contact with the plastic clutch cover 31, which may cause problems such as gumming or difficulty in rotating.

[0062] The front and rear stepped tooth portions are formed on the metal shaft by plastic injection molding. The metal shaft is axially knurled and fixed with the two gears. The structure is simple and the transmission is stable.

[0063] The slide ring 36 is embedded and hot riveted to the lower housing 12 to avoid abnormal noise caused by its movement.

[0064] A sealing ring 60 is arranged between the lower end of the output shaft 33 and the lower housing 12 to enhance the shaft diameter sealing.

[0065] A Hall module 90 is also arranged between the upper housing 11 and the lower housing 12 to complete real-time monitoring. The Hall monitoring principle is as follows: The opening angle of the rearview mirror is generally between 40-60°. The real-time position of the mirror is monitored by a small gear meshing with the output shaft 33, which amplifies the number of rotation turns and matches a magnetic ring fixed thereto. Through a Hall sensor, as many Hall signals as possible are output to improve the position judgment accuracy.

[0066] In summary, the utility model has the following advantages:

[0067] 1) transmission chain:

[0068] Scheme: staggered teeth and worm gear cooperation, full plastic gear, and optional clutch.

[0069] Advantages:

[0070] a. The positive drive transmission efficiency is improved, the energy consumption is reduced, the product cost is low, and better economic benefits are obtained.

[0071] b. After the optional clutch, the positive and negative driving can pass through the slip to protect itself when encountering obstacles, that is, when the rearview mirror is folded by external force (such as manual opening or closing under power failure or collision with other vehicles), it will not cause damage to the transmission chain and cause maintenance costs.

[0072] c. Because plastic gears are used, the corrosion resistance and sound performance will be better.

[0073] 2) Real-time position monitoring

[0074] Scheme: matched with Hall IC, and real-time monitoring of the rotation angle of the output shaft, which will not cause misjudgment of the opening angle of the rearview mirror due to clutch slip.

[0075] Advantages:

[0076] a. The vehicle body ECU can know the opening position of the rearview mirror in real time, and can also customize the opening position and speed.

[0077] b. Additional anti-pinch or collision strategies can be added, such as for drivers without a clutch module, to provide mechanism protection.

[0078] 3) Communication mode

[0079] Scheme: motor connection harness, which can be matched with a chip in other embodiments to support LIN communication.

[0080] Advantages:

[0081] a. Self-learning and self-diagnosis are realized, and OTA upgrade is supported. This is an extension example, and the utility model will not be described in detail here.

[0082] b. High integration, saving external hardwires, and easy to arrange.

[0083] 4) IP protection

[0084] Scheme: the upper and lower shells are commonly ultrasonically welded, the output shaft is radially increased with dynamic sealing, and the motor external circuit is increased with glue sealing.

[0085] Advantages: eliminate the gap between the rotating arm and the static arm, reduce the contact with the air environment, eliminate the invasion of water vapor and dust into the actuator, bring protection to the function and performance of the driver, and prolong the service life.

[0086] The above description shows and describes several preferred embodiments of the present application, but as previously described, it should be understood that the present application is not limited to the forms disclosed herein, and should not be considered as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application conceived herein by the above teachings or related art or knowledge. Any modification and change made by those skilled in the art without departing from the spirit and scope of the present application shall be within the protection scope of the appended claims of the present application.

Claims

1. An automotive electronic rearview mirror actuator, comprising an upper housing, a lower housing, and a drive assembly and a clutch output assembly located between the upper housing and the lower housing, characterized in that, The driving component includes: An electric motor, the electric motor having an output gear; An embedded gear shaft has a front stepped gear portion and a rear stepped gear portion axially fixed by a metal shaft, wherein the front stepped gear portion meshes with the motor output gear through a stepped transmission gear. The main drive gear meshes with the rear stepped gear section, and the side of the main drive gear has a receiving groove. The clutch output component includes: Clutch cover, the clutch cover being engaged with the receiving groove; A clutch bushing, the clutch bushing being located between the clutch cover and the main drive gear; The output shaft is axially fixed to the clutch bushing via a keyway. The upper end of the output shaft is pressed against the upper housing by a compression spring, and the lower end extends out of the lower housing and connects to the output panel. A slide ring is fixed to the inner wall of the lower housing and passes through the output shaft.

2. The automotive electronic rearview mirror actuator according to claim 1, characterized in that, The outer ring of the output shaft has multiple guide blocks that press against the slide ring. The slide ring is provided with multiple arc-shaped bosses facing the guide blocks. The output shaft rotates so that the guide blocks press against or intersect with the arc-shaped bosses.

3. The automotive electronic rearview mirror actuator according to claim 1, characterized in that, A wave spring is provided between the clutch bushing and the clutch cover, and clutch washers are provided above and below the wave spring.

4. The automotive electronic rearview mirror actuator according to claim 1, characterized in that, The front stepped gear portion and the rear stepped gear portion are molded onto the metal shaft by plastic coating, and the metal shaft is axially knurled and fixedly connected to the two gears.

5. The automotive electronic rearview mirror actuator according to claim 1, characterized in that, The surface of the receiving groove is engaged with the clutch bushing via a keyway.

6. The automotive electronic rearview mirror actuator according to claim 1, characterized in that, The slide ring is embedded and hot-riveted to the lower housing.

7. The automotive electronic rearview mirror actuator according to claim 1, characterized in that, A sealing ring is provided between the lower end of the output shaft and the lower housing.

8. The automotive electronic rearview mirror actuator according to claim 1, characterized in that, The upper housing and the lower housing are welded using common ultrasonic welding.

9. The automotive electronic rearview mirror actuator according to claim 1, characterized in that, A Hall module is also provided between the upper housing and the lower housing.

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