Electric folding device for frameless outside rear-view mirror of automobile

Abstract

The invention discloses an automobile frameless outside rear-view mirror electric folding device which comprises a motor main structure assembly, a motor folding hydraulic assembly, a motor manual folding assembly, a motor folding driving assembly, a motor horizontal adjusting hydraulic assembly and a horizontal adjusting driving assembly. The motor folding driving assembly conveys hydraulic oil to the motor folding hydraulic assembly through the gear pump assembly, then the motor folding hydraulic assembly is driven to rotate around the motor folding axis, and folding of a rearview mirror lens is achieved. The horizontal adjustment driving assembly conveys hydraulic oil to the motor horizontal adjustment hydraulic assembly through the gear pump assembly, then the motor horizontal adjustment hydraulic assembly is driven to rotate around the motor horizontal adjustment axis, and an output shaft of the motor horizontal adjustment hydraulic assembly drives the rearview mirror lens installation base to rotate through the torque transmission mechanism. The adjusting function of the rearview mirror lens is achieved. Low-noise work can be achieved, meanwhile, the control method of the whole vehicle is unchanged, and good compatibility is achieved.

Description

Technical Field

[0001] This invention relates to an electric folding device for a frameless exterior rearview mirror for automobiles, belonging to the field of automotive parts control. Background Technology

[0002] Existing frameless electric folding mechanisms for automotive exterior rearview mirrors, such as Figure 1 As shown, this structure has the following main drawbacks:

[0003] (1) Excessive noise and abnormal sounds during operation. The core principle of existing electric folding rearview mirror devices is: a DC motor drives a gear + worm gear reducer to achieve the folding and vertical adjustment of the rearview mirror lens. During operation, both the DC motor and the reduction mechanism generate significant noise, and this noise spectrum is often discontinuous, exhibiting sharp frequency bands. Manufacturing errors in the reduction mechanism further amplify this defect. In the context of the widespread adoption of new energy passenger vehicles, this defect becomes even more prominent because the overall background noise of the vehicle is much lower than that of traditional internal combustion engine passenger vehicles.

[0004] (2) Poor reliability in low temperature, high temperature and humidity environments. Because existing electric folding mechanisms for exterior rearview mirrors commonly use plastic gears and housings, in low temperature, high temperature and humidity environments, the plastic parts undergo dimensional changes due to thermal expansion and contraction and moisture absorption. These changes alter the fit accuracy of the gears and worm gears, leading to increased friction and excessive wear of moving parts. All of these factors ultimately cause problems such as occasional failure to fold and abnormal folding noises when the exterior rearview mirror is electrically folded.

[0005] (3) Insufficient load-bearing capacity for the lens. Due to the internal space limitations of the exterior rearview mirror, the module of the worm gear and gear cannot be too large, resulting in limited strength of the worm gear and gear teeth. The lens load of existing folding motors is generally no more than 1000g, which is not suitable for use in larger exterior rearview mirrors.

[0006] (4) High manufacturing difficulty and high manufacturing cost. Since the reduction mechanism of the existing electric folding device of the exterior rearview mirror is essentially a gear + worm gear reducer, the manufacturing precision of the gear, worm, worm and reduction gearbox will inevitably determine the performance and life of the assembly. Therefore, strict dimensional control and a large number of high-precision manufacturing equipment and molds are required. Summary of the Invention

[0007] The purpose of this invention is to provide an electric folding device for frameless exterior rearview mirrors of automobiles, which can achieve low noise operation and large output torque, and the size does not exceed that of existing electric folding mechanisms. The control method of the whole vehicle remains unchanged, achieving good compatibility.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an electric folding device for a frameless exterior rearview mirror, comprising a main motor structure assembly, a motor folding hydraulic assembly, a motor manual folding assembly, and a motor folding drive assembly. The motor folding drive assembly delivers hydraulic oil to the motor folding hydraulic assembly via a gear pump assembly, thereby driving the motor folding hydraulic assembly to rotate around the motor folding axis, thus realizing the folding of the rearview mirror lens. Simultaneously, the device also includes a motor horizontal adjustment hydraulic assembly and a horizontal adjustment drive assembly. The horizontal adjustment drive assembly delivers hydraulic oil to the motor horizontal adjustment hydraulic assembly via a gear pump assembly, thereby driving the motor horizontal adjustment hydraulic assembly to rotate around the motor horizontal adjustment axis. The output shaft of the motor horizontal adjustment hydraulic assembly drives the rearview mirror lens mounting base to rotate via a torque transmission mechanism, thus realizing the adjustment function of the rearview mirror lens.

[0009] Furthermore, the main structure component of the motor includes a rearview mirror lens mounting base, a base plate, and a ball bearing plate. Ball bearings are provided between the rearview mirror lens mounting base and the main shaft plastic-coated part. The ball bearing plate is fixedly connected to the rearview mirror lens mounting base, and rollers are provided between the ball bearing plate and the base plate.

[0010] Furthermore, the balls are fixed by ball retainers, and an elastic pressure plate is provided above the rollers to maintain smoothness and reduce noise.

[0011] Furthermore, the motor horizontal adjustment hydraulic assembly includes a horizontal adjustment piston, a horizontal adjustment guide gear ring, a horizontal adjustment hydraulic cylinder, a steel pipe, a large cylinder head, and a small cylinder head. The horizontal adjustment piston is disposed inside the horizontal adjustment hydraulic cylinder. The horizontal adjustment piston meshes with the horizontal adjustment guide gear ring through oblique meshing teeth disposed around it. The horizontal adjustment piston moves and rotates under the drive of hydraulic oil.

[0012] Furthermore, the horizontal adjusting piston is mounted on a steel pipe, and internal hexagonal holes for outputting torque are provided at both ends of the steel pipe.

[0013] Furthermore, the torque transmission mechanism includes a drive shaft, a rotating shaft, a rotating shaft sleeve, and a rearview mirror lens mounting base drive gear. One end of the drive shaft is connected to the output end of the horizontal adjustment drive assembly, and the other end is connected to the rearview mirror lens mounting base drive gear through a transmission gear. The rearview mirror lens mounting base drive gear is mounted on the rotating shaft, and a rotating shaft sleeve is fitted onto the end of the rotating shaft.

[0014] Furthermore, both the horizontal adjustment drive assembly and the motor folding drive assembly include a drive motor, a planetary reducer assembly, and a clutch assembly. The DC motor drives the internal gear pump to move through the clutch assembly and the planetary reducer assembly, and the internal gear pump drives the piston assembly to move up and down through hydraulic oil.

[0015] Furthermore, the clutch assembly includes an input disc, a meshing disc, a diaphragm disc spring, an output shaft, and a first-stage sun gear. The input disc and the meshing disc mesh with each other through meshing teeth. The diaphragm disc spring is located on the outside of the meshing disc, with its center inserted into the front groove of the input disc and its circumference pressed against the meshing disc. It is used to provide a certain pressure to engage the input disc and the meshing disc. When the resistance is less than the rated value, the torque is transmitted to the first-stage sun gear and the output shaft through the meshing disc. When the resistance is greater than the rated value, the axial thrust generated by the inclined surface of the meshing teeth pushes the diaphragm disc spring to undergo elastic deformation, the meshing teeth disengage, and the DC motor idles.

[0016] Furthermore, the motor folding drive assembly includes a main shaft, a plastic-coated part of the main shaft, a piston, a hydraulic cylinder, and a guide gear ring. The piston is mounted on the main shaft, and the guide gear ring is mounted inside the hydraulic cylinder. The piston, the main shaft, and the guide gear ring are engaged by oblique T-shaped teeth. The piston moves under the drive of hydraulic oil and drives the main shaft to rotate.

[0017] Furthermore, the motor manual folding assembly includes a rivet tube, a base, and a disc spring. The base is mounted on the rivet tube, and the base and the main shaft plastic-coated part are engaged with each other through the interlocking inclined surfaces of the concave-convex structure. Under the action of the disc spring, the base and the main shaft plastic-coated part are engaged.

[0018] The beneficial effects of this invention are as follows:

[0019] (1) Eliminate noise and completely eliminate the problem of abnormal noise when folding the exterior rearview mirror.

[0020] (2) The whole system is rigid, eliminating the loosening phenomenon of the existing structure.

[0021] (3) It has a large output torque and can carry a lens weighing 1300g.

[0022] (4) It simplifies the manufacturing process and reduces manufacturing difficulty. Except for the rotating piston, which requires control of the groove shape tolerance, other core components only need to control the diameter tolerance, roundness tolerance, and concentricity; it is basically a single-dimensional control. In contrast, traditional folding motors have components such as gears and worm gears, so they need to control more characteristic tolerances, such as tooth profile, tooth center distance, and worm gear meshing, which is extremely difficult.

[0023] (5) It is designed with a mechanical clutch structure, so the motor does not require an electronic module to protect the DC motor. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an existing frameless electric folding rearview mirror.

[0025] Figure 2This is a schematic diagram of the external structure of the electric folding device for the frameless exterior rearview mirrors of this car.

[0026] Figure 3 This is a schematic diagram of the installation of the electric folding device for the frameless exterior rearview mirrors of this car.

[0027] Figure 4 This is a schematic diagram showing the connection between the electric folding device of the frameless exterior rearview mirror and the mirror mount of the car.

[0028] Figure 5 This is a schematic diagram showing the connection between the electric folding device of the frameless exterior rearview mirror and the lens of the exterior rearview mirror.

[0029] Figure 6 This is a schematic diagram of the main components of the electric folding motor of the frameless exterior rearview mirror of this car (with the motor cover open).

[0030] Figure 7 This is an exploded view of the main components of the folding motor in the electric folding device of the frameless exterior rearview mirror of this car.

[0031] Figure 8 This is a cross-sectional view of the electric folding drive motor and planetary reducer assembly / horizontal motor drive motor and planetary reducer assembly of the present invention.

[0032] Figure 9 This is a schematic diagram of the working principle of the clutch of the present invention, wherein (a) is an assembly diagram and (b) is an exploded diagram.

[0033] Figure 10 This is an assembly diagram of the gear pump assembly of the present invention.

[0034] Figure 11 This is an exploded view of the electric folding hydraulic assembly of the present invention.

[0035] Figure 12 This is a cross-sectional view of the electric folding hydraulic assembly of the present invention.

[0036] Figure 13 This is a schematic diagram of the hydraulic oil inlet and outlet arrangement in the electric folding hydraulic assembly of the present invention.

[0037] Figure 14 This is a diagram showing the fit between the piston, main shaft, and guide gear ring in the electric folding hydraulic assembly of the present invention.

[0038] Figure 15 This is an exploded view of the horizontal adjustment hydraulic assembly of the present invention.

[0039] Figure 16 This is a cross-sectional view of the horizontal adjustment hydraulic assembly of the present invention.

[0040] Figure 17 This is a schematic diagram of the hydraulic oil inlet and outlet arrangement in the horizontal adjustment hydraulic assembly of the present invention.

[0041] Figure 18 This is a cross-sectional view of the piston and guide gear ring meshing in the horizontal adjustment hydraulic assembly of the present invention.

[0042] Figure 19 This is an exploded view of the main components of the manually folding assembly of the present invention.

[0043] Figure 20 This is a schematic diagram of the engagement slope of the manual folding component of the present invention.

[0044] Figure 21 This is a schematic diagram of the horizontal adjustment mechanism of the present invention.

[0045] Figure 22 This is a schematic diagram of the torque transmission mechanism of the present invention.

[0046] Figure 23 This is an exploded view of the main structural components of the motor of the present invention.

[0047] Figure 24 This is a schematic diagram of the hydraulic pipeline of the present invention.

[0048] Figure 25 This is a product assembly diagram of the present invention.

[0049] The diagram is labeled as follows: 1-Main motor structure assembly, 2-Manual motor folding assembly, 201-Rivet pipe, 202-Disc spring, 203-Spring washer, 3-Motor horizontal adjustment hydraulic assembly, 301-Horizontal adjustment hydraulic cylinder, 302-Horizontal adjustment piston, 303-Large cylinder head, 304-Small cylinder head, 305-Horizontal adjustment guide gear ring, 306-Steel pipe, 307-Piston meshing teeth, 308-Guide gear ring meshing teeth, 4-Gear pump assembly, 5-Horizontal adjustment drive assembly, 6-Motor folding drive assembly, 7-Motor folding hydraulic assembly, 701-Folding hydraulic... 702-Folding hydraulic piston, 703-Folding hydraulic cylinder, 704-Folding hydraulic guide gear ring, 705-Main spindle plastic-coated part, 706-Main spindle steel tube insert, 707-Main spindle end cover, 708-Upper cylinder head, 709-Upper cylinder head insert, 710-Piston inner T-shaped meshing teeth, 711-Piston outer T-shaped meshing teeth, 712-Main spindle T-shaped meshing teeth, 713-Guide gear ring T-shaped meshing teeth, 8-Motor cover, 9-Rearview mirror folding axis, 10-Rearview mirror horizontal rotation axis, 11-Rearview mirror mount fixing hole, 12-Rearview mirror lens fixing hole, 13-Rear 14-Rearview mirror mount, 15-Connecting stud between rearview mirror lens and motor lens mounting plate, 16-DC motor, 17-Input disc, 18-Meshing disc, 19-Diaphragm disc spring, 20-First stage sun gear, 21-Motor housing, 22-Sun gear, 23-Planet gears, 24-Planet gear retaining disc, 25-Ring gear, 26-Motor retaining ring, 27-Clutch assembly, 28-Input shaft I, 29-Input shaft II, 30-Base plate, 31-Ball bearing, 32-Ball bearing cage, 33-Hydraulic oil inlet / outlet, 34-Base, 3 5-Base meshing slope, 36-Main shaft meshing slope, 37-Center point, 38-Rearview mirror lens mounting base, 39-Rotating shaft, 40-Rotating shaft sleeve, 41-Rotating shaft sleeve pressure plate, 42-Roller pressure plate, 43-Roller, 44-Elastic pressure plate, 45-Drive shaft, 46-Drive gear, 47-Rearview mirror lens mounting base drive gear, 48-Folding hydraulic cylinder pre-embedded hydraulic pipe, 49-Horizontal adjustment hydraulic cylinder pre-embedded hydraulic pipe, 50-Internal gear pump I oil circuit interface, 51-Internal gear pump II oil circuit interface, 52-Connecting stud between rearview mirror lens and motor lens fixing plate. Detailed Implementation

[0050] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0051] like Figures 2 to 7As shown, an electric folding device for a frameless exterior rearview mirror includes a motor main structure assembly 1, a motor manual folding assembly 2, a motor folding hydraulic assembly 7, a motor folding drive assembly 6, a motor horizontal adjustment hydraulic assembly 3, and a horizontal adjustment drive assembly 5. The motor folding drive assembly 6 delivers hydraulic oil to the motor folding hydraulic assembly 7 via a gear pump assembly 4, thereby driving the motor folding hydraulic assembly 7 to rotate around a motor folding axis 9, thus folding the rearview mirror lens. The horizontal adjustment drive assembly 5 delivers hydraulic oil to the motor horizontal adjustment hydraulic assembly 3 via the gear pump assembly 4, thereby driving the motor horizontal adjustment hydraulic assembly 3 to rotate around a motor horizontal adjustment axis 10. The output shaft of the motor horizontal adjustment hydraulic assembly 3 drives the rearview mirror lens mounting base 38 to rotate via a torque transmission mechanism, thus achieving the adjustment function of the rearview mirror lens.

[0052] like Figures 8 to 9 As shown, the working principle of the drive motor and planetary reducer of the motor folding drive assembly and the horizontal adjustment drive assembly is as follows: the torque of the DC motor 15 is transmitted to the sun gear 22 through the clutch assembly 27, and then the torque is increased by the planetary gears 23 and the ring gear before being transmitted to the planetary gear fixed disk 24. The entire mechanism is sealed in the motor housing 21, which avoids dust contamination and facilitates lubrication and reduces noise.

[0053] The clutch assembly 27 consists of an input disc 16, an engagement disc 17, a diaphragm disc spring 18, an output shaft 19, and a first-stage sun gear 20. The input disc 16 and engagement disc 17 are designed with toothed meshing. The diaphragm disc spring 18 provides pressure to engage the input disc 16 and engagement disc 17. When the resistance (torque) is less than the rated value, the torque is transmitted to the output shaft and the first-stage sun gear through the engagement disc 17. However, when the resistance (torque) is greater than the rated value, the axial thrust generated by the inclined surface of the meshing teeth pushes the diaphragm disc spring 18 to undergo elastic deformation, disengaging the meshing teeth and allowing the DC motor to idle, thus preventing overload and burnout and providing protection.

[0054] like Figure 10 The gear pump has input shaft I 28 and input shaft II 29, meaning the motor drives internal gear set I and internal gear set II respectively, outputting hydraulic oil with different pressures and flow rates. The hydraulic oil circuit description is as follows... Figure 24 As shown. Internal gear pump I drives the folding hydraulic assembly; internal gear pump II drives the horizontal hydraulic assembly. The hydraulic pipes are made of seamless stainless steel pipes that are bent and cut; then they are placed in an injection molding machine to injection mold and cover the skeleton; finally, during the injection molding production of the base plate, the mold is placed in (as an insert), and the injection molding production is completed.

[0055] like Figures 11 to 14As shown, the working principle of the electric folding hydraulic assembly is as follows: Under the action of hydraulic oil, the piston will move upward. Because the piston meshes with the main shaft and guide gear ring via oblique T-shaped teeth; simultaneously, the hydraulic cylinder's axial movement is restricted by the end face bearings on the upper and lower end faces, ultimately causing the hydraulic cylinder and main shaft to rotate. Since the main shaft is fixed to the rearview mirror mount via the hand-folding assembly, the base plate and hydraulic cylinder (connected by screws) will inevitably drive the lens to rotate, i.e., the lens folds.

[0056] like Figure 14 The internal meshing teeth on the folding hydraulic piston 702 engage with the meshing teeth of the folding hydraulic main shaft 701. The external meshing teeth of the folding hydraulic piston 702 engage with the meshing teeth of the folding hydraulic guide gear ring 704. Specifically, the meshing teeth of the guide gear ring and the meshing teeth of the main shaft rotate in opposite directions; the guide gear ring and the hydraulic cylinder are fixedly fitted together, with no relative movement. This structure allows for a large rotation angle to be generated with a relatively small piston stroke, meeting the requirement for a large folding angle of the rearview mirror.

[0057] like Figures 15 to 18 As shown, the working principle of the motor-driven horizontal adjustment hydraulic assembly is as follows: Under the action of hydraulic oil, the horizontal adjustment piston 302 will move axially. Since the circumference of the horizontal adjustment piston has oblique meshing teeth that mesh with the guide gear ring 305, the piston simultaneously generates rotational motion during its movement. Because the horizontal rotation angle of a typical lens is relatively small (~±10º), a single-meshing-tooth structure (meshing teeth only on the outer ring of the piston) can be used. To output torque, internal hexagonal holes are designed on both sides of the piston. Simultaneously, to increase piston rigidity, a steel tube insert is designed into the piston.

[0058] like Figure 19 and 20 As shown, the working principle of the motor-driven manual folding assembly is as follows: The base 30, main shaft assembly, spring washers, disc springs, and other components are connected in series via the riveting pipe 201. Due to the six meshing inclined surfaces between the base and the main shaft, under normal conditions (corresponding to vehicle movement), no relative movement occurs between the base (connected to the mirror mount) and the main shaft, meaning the mirror remains stable. When the mirror is manually folded (i.e., the rearview mirror is manually folded), torque is transmitted to the main shaft. When the force applied to the mirror is sufficient (overcoming the pressure of the disc springs), the six meshing inclined surfaces between the base and the main shaft slide, causing rotation between the main shaft and the base (the mirror rotates, i.e., the rearview mirror folds).

[0059] like Figures 21 to 23As shown, the working principle of the main motor structure is as follows: Driven by the electric folding hydraulic assembly and the horizontal adjustment hydraulic assembly, the rearview mirror lens mounting base rotates around the horizontal rotation axis and the folding axis of the rearview mirror, respectively, thus realizing the folding and adjustment functions of the rearview mirror lens. To ensure smooth and stable movement and meet the vibration requirements of the entire vehicle, the electric folding hydraulic assembly is designed with end-face ball bearings and wear-resistant metal sleeves.

[0060] Because the horizontal adjustment hydraulic assembly is eccentrically mounted, a mechanism is needed to transmit torque to the rearview mirror lens mounting base. Specifically, this torque transmission mechanism drives the rearview mirror lens mounting base to rotate, thus achieving the adjustment function of the rearview mirror lens. The torque transmission mechanism includes a drive shaft 45, a rotating shaft 39, a rotating shaft sleeve 40, and a rearview mirror lens mounting base drive gear 47. One end of the drive shaft 45 is connected to the output end of the horizontal adjustment drive assembly, and the other end is connected to the rearview mirror lens mounting base drive gear 47 via a drive gear 46. A rotating shaft sleeve is fitted at the end of the rotating shaft, and the rotating shaft and rotating shaft sleeve ensure that the rearview mirror lens mounting plate rotates around the horizontal rotation axis of the rearview mirror. Ball bearings 31 and rollers 43 ensure smooth and low-noise rotation; meanwhile, the elastic pressure plate 44 is a thin-walled spring steel component, and its interference fit with the rollers provides constant damping, absorbing vibrations during vehicle operation; it also eliminates gap changes caused by manufacturing errors and temperature variations in various moving parts.

[0061] Preferably, in order to further improve the load capacity and resistance to rough operation of the motor, the gears of the drive shaft and the rearview mirror lens mounting bracket drive gear are large gears with a module of 1.

[0062] In the specific production implementation of this device, the following requirements can be referenced:

[0063] (1) Requirements for power supply of the motor to the whole vehicle: The power supply requirement of this folding motor is 9~16V, 1.2~1.5A DC power supply; the power supply time of a single power supply is ≤15S.

[0064] (2) Selection of linear motor: A small motor with a diameter of φ20 can be selected.

[0065] (3) Selection of hydraulic oil: It is recommended to select hydraulic oil that meets the DOT5.1 standard.

[0066] (4) Safe working pressure of hydraulic system: 2~3MPa.

[0067] (5) Effective sealing: The sealing ring installed on the piston should be able to ensure that the hydraulic oil does not leak in an environment of -40℃ to 90℃.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the scope of protection of the present invention in any way, and all technical solutions obtained by equivalent substitution or other means fall within the scope of protection of the present invention. Parts not covered in this invention are the same as or can be implemented using existing technology.

Claims

1. A frameless electric folding device for automotive rearview mirrors, comprising a main motor structure assembly, a motor folding hydraulic assembly, a motor manual folding assembly, and a motor folding drive assembly, wherein the motor folding drive assembly delivers hydraulic oil to the motor folding hydraulic assembly via a gear pump assembly, thereby driving the motor folding hydraulic assembly to rotate around a motor folding axis to achieve folding of the rearview mirror lens; characterized in that, The device also includes a motor leveling hydraulic assembly and a leveling drive assembly. The leveling drive assembly delivers hydraulic oil to the motor leveling hydraulic assembly via a gear pump assembly, thereby driving the motor leveling hydraulic assembly to rotate around the motor leveling axis. The output shaft of the motor leveling hydraulic assembly drives the rearview mirror lens mounting base to rotate via a torque transmission mechanism, thereby realizing the adjustment function of the rearview mirror lens.

2. The electric folding device for frameless exterior rearview mirrors of automobiles according to claim 1, characterized in that, The main structure assembly of the motor includes a rearview mirror lens mounting base, a base plate, and a ball bearing plate. Ball bearings are provided between the rearview mirror lens mounting base and the plastic-coated part of the main shaft. The ball bearing plate is fixedly connected to the rearview mirror lens mounting base, and rollers are provided between the ball bearing plate and the base plate.

3. The electric folding device for frameless exterior rearview mirrors of automobiles according to claim 2, characterized in that, The balls are fixed by ball retainers, and an elastic pressure plate is provided above the rollers to maintain smoothness and reduce noise.

4. The electric folding device for frameless exterior rearview mirrors of automobiles according to claim 1, characterized in that, The motor horizontal adjustment hydraulic assembly includes a horizontal adjustment piston, a horizontal adjustment guide gear ring, a horizontal adjustment hydraulic cylinder, a steel pipe, a large cylinder head, and a small cylinder head. The horizontal adjustment piston is disposed inside the horizontal adjustment hydraulic cylinder. The horizontal adjustment piston meshes with the horizontal adjustment guide gear ring through oblique meshing teeth arranged around it. The horizontal adjustment piston moves and rotates under the drive of hydraulic oil.

5. The electric folding device for frameless exterior rearview mirrors of automobiles according to claim 4, characterized in that, The horizontal adjusting piston is mounted on a steel pipe, and internal hexagonal holes for outputting torque are provided at both ends of the steel pipe.

6. The electric folding device for frameless exterior rearview mirrors of automobiles according to claim 1 or 4, characterized in that, The torque transmission mechanism includes a drive shaft, a rotating shaft, a rotating shaft sleeve, and a rearview mirror lens mounting base drive gear. One end of the drive shaft is connected to the output end of the horizontal adjustment drive component, and the other end is connected to the rearview mirror lens mounting base drive gear through a transmission gear. The rearview mirror lens mounting base drive gear is mounted on the rotating shaft, and a rotating shaft sleeve is fitted at the end of the rotating shaft.

7. The electric folding device for frameless exterior rearview mirrors of automobiles according to claim 1, characterized in that, Both the horizontal adjustment drive assembly and the motor folding drive assembly include a drive motor, a planetary reducer assembly, and a clutch assembly. The DC motor drives the internal gear pump to move through the clutch assembly and the planetary reducer assembly. The internal gear pump drives the piston assembly to move up and down through hydraulic oil.

8. The electric folding device for frameless exterior rearview mirrors of automobiles according to claim 1, characterized in that, The clutch assembly includes an input disc, a meshing disc, a diaphragm disc spring, an output shaft, and a primary sun gear. The input disc and the meshing disc mesh with each other through meshing teeth. The diaphragm disc spring is located on the outside of the meshing disc, with its center locked in the front groove of the input disc and its circumference pressed against the meshing disc. It is used to provide a certain pressure to engage the input disc and the meshing disc. When the resistance is less than the rated value, the torque is transmitted to the primary sun gear and the output shaft through the meshing disc. When the resistance is greater than the rated value, the axial thrust generated by the inclined surface of the meshing teeth pushes the diaphragm disc spring to undergo elastic deformation, the meshing teeth disengage, and the DC motor idles.

9. The electric folding device for frameless exterior rearview mirrors of automobiles according to claim 1, characterized in that, The motor folding drive assembly includes a main shaft, a plastic-coated part of the main shaft, a piston, a hydraulic cylinder, and a guide gear ring. The piston is mounted on the main shaft, and the guide gear ring is mounted inside the hydraulic cylinder. The piston, the main shaft, and the guide gear ring are engaged by oblique T-shaped teeth. The piston moves under the drive of hydraulic oil and drives the main shaft to rotate.

10. The electric folding device for a frameless exterior rearview mirror of an automobile according to claim 1, characterized in that, The motor manual folding assembly includes a rivet tube, a base, and a disc spring. The base is mounted on the rivet tube, and the base and the main shaft plastic-coated part are engaged by a convex-concave structure with interlocking inclined surfaces. Under the action of the disc spring, the base and the main shaft plastic-coated part are engaged.

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