Electric folding device for automobile outside rear-view mirror

Abstract

The electric folding device comprises a motor shell, the motor shell is provided with a left cavity and a right cavity, one cavity is internally provided with a direct current motor, a clutch assembly, a planetary reducer assembly and an internal gear pump, and the other cavity is internally provided with a gear ring, a piston assembly, a main shaft assembly and a riveting pipe. The direct current 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 through hydraulic oil, a cylinder body of the piston assembly is arranged on the main shaft in a sleeving mode, and internal meshing balls and external meshing balls or trapezoidal meshing teeth are arranged at the upper end of the cylinder body. The inner meshing balls are meshed with an inner meshing track arranged on the main shaft, and the outer meshing balls or the trapezoidal meshing teeth are meshed with an outer meshing track arranged on the gear ring. According to the invention, low-noise work can be realized, the lifting height and the output torque are relatively large, and the working reliability in low-temperature, high-temperature and high-humidity environments can be improved.

Description

Technical Field

[0001] This invention relates to an electrically folding device for automotive exterior rearview mirrors, belonging to the field of automotive electric control. Background Technology

[0002] Existing electric folding mechanisms for automotive exterior rearview mirrors have the following 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 lift and fold 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) Poor tolerance to foreign objects. The existing electric folding device of the exterior rearview mirror uses a cam structure to achieve the lifting function, which limits the lifting height (not more than 1.5mm). The insufficient lifting height means that the folding gap between the exterior rearview mirror lens and the mirror base cannot be made larger during folding. If there is a lot of dust in the gap, or if the plastic parts of the rearview mirror are out of tolerance, the electric folding function cannot work reliably.

[0006] (4) Poor ice-breaking ability in winter. Since the reduction mechanism of the existing electric folding device of the exterior rearview mirror is essentially a gear + worm gear reducer, most of the parts are plastic. At low temperatures, due to the change in size, the folding torque decreases. When there is ice between the lens and the mirror mount of the exterior rearview mirror, it often cannot work reliably and the ice needs to be removed manually to restore the electric folding function of the exterior rearview mirror.

[0007] (5) High manufacturing difficulty and 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

[0008] The purpose of this invention is to provide an electric folding device for automotive exterior rearview mirrors, which can achieve low-noise operation, a large lifting height and output torque, low manufacturing cost, size not exceeding that of existing electric folding mechanisms, no change to the overall vehicle control method, and achieve compatibility.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an electric folding device for automotive exterior rearview mirrors, comprising a motor housing, wherein the motor housing has two chambers, one chamber housing a DC motor, a clutch assembly, a planetary reducer assembly, and an internal gear pump, and the other chamber housing a gear ring, a piston assembly, a main shaft assembly, and a rivet tube. 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. The cylinder of the piston assembly is mounted on the main shaft. Furthermore, the inner wall of the upper end of the cylinder is provided with internal meshing balls, and the outer wall of the upper end of the cylinder is provided with external meshing balls or trapezoidal meshing teeth. The internal meshing balls mesh with the internal meshing track opened on the main shaft, and the external meshing balls or trapezoidal meshing teeth mesh with the external meshing track opened on the inner wall of the gear ring. The internal meshing track is divided into a straight section at the bottom and an inclined section at the top. The external meshing track is an inclined section as a whole. Under the drive of hydraulic oil, the internal meshing balls first move upward along the straight section of the internal meshing track, and then the internal meshing balls enter the inclined section of the internal meshing track.

[0010] Furthermore, the upper end of the piston assembly forms hydraulic cylinder region I, and the lower end forms hydraulic cylinder region II. The end of hydraulic cylinder region I is closed by the upper cover of the hydraulic cylinder, and the end of hydraulic cylinder region II is closed by the lower cover of the hydraulic cylinder. Both hydraulic cylinder regions I and II are connected to an internal gear pump via hydraulic pipes. The internal gear pump pressurizes the hydraulic oil and inputs it into hydraulic cylinder region II. The hydraulic oil in hydraulic cylinder region II drives the piston assembly to move. The piston moves along the track set on the main shaft assembly via the gear ring, causing the motor housing to generate upward linear and rotational motion, which drives the lens of the exterior rearview mirror to lift and fold. At the same time, the hydraulic oil in hydraulic cylinder region I flows into the internal gear pump through the hydraulic pipes for continuous oil supply.

[0011] Furthermore, the internal and external meshing balls are respectively limited by ball cages, and the slant guide distance of the external meshing track is greater than that of the external meshing track.

[0012] Furthermore, the upper end of the spindle is connected to a limit ring, and the lower end is provided with a spindle plastic coating. A base is provided below the spindle plastic coating, and the spindle plastic coating and the base are engaged with each other through the interlocking inclined surfaces of the concave-convex structure.

[0013] Furthermore, an upper end face ball and a lower end face ball are respectively provided below the limiting ring and above the main shaft plastic-coated part, and the upper end face ball and the lower end face ball are limited by a ball retainer; and an upper end face steel plate is provided above the upper end face ball, and an upper cover steel plate is provided at the opposite position of the upper cover of the hydraulic cylinder below; a lower end steel sleeve is provided below the lower end face ball, and a lower cover steel plate is provided at the opposite position of the lower cover of the hydraulic cylinder above.

[0014] Furthermore, the spindle is rotatably mounted on the rivet tube, and a steel tube is provided inside the spindle. An upper steel sleeve is installed at the upper end of the spindle, and a lower steel sleeve is installed at the lower end of the spindle. The lower end of the lower steel sleeve extends horizontally in all directions to below the lower end face ball.

[0015] Furthermore, a spring assembly is provided between the upper port of the spindle and the upper port of the rivet tube, the spring assembly including a disc spring and spring washers located at the upper and lower ends of the disc spring.

[0016] 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.

[0017] Furthermore, the planetary reducer assembly adopts an embedded motor bracket structure.

[0018] Furthermore, a lower cylinder cover insert is provided on the lower cover of the hydraulic cylinder, and a dust cover is installed outside the lower cylinder cover insert, with the dust cover and the base being interference fit.

[0019] The beneficial effects of this invention are as follows:

[0020] (1) Eliminate noise and completely eliminate the problem of abnormal noise when folding the exterior rearview mirror.

[0021] (2) Large lifting height. This allows for a design gap of <0.5mm between the exterior rearview mirror lens and the mirror mount. The small gap helps to eliminate wind noise from the exterior rearview mirror; and when folding, the mirror can be raised by 0~4mm, thus avoiding folding interference.

[0022] (3) The large lifting height can eliminate the influence of foreign objects and winter ice on the folding function.

[0023] (4) Larger lifting force and folding torque. By optimizing the design of the gear pump and hydraulic cylinder diameter, the lifting force and output torque of the folding motor can be exceeded, which can effectively overcome the reliability problems in low temperature, high temperature and high humidity environments.

[0024] (5) 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.

[0025] (6) It is designed with a mechanical clutch structure, so the motor does not require an electronic module to protect the DC motor.

[0026] (7) The entire motor system has high rigidity and can withstand greater lens weight. Attached Figure Description

[0027] Figure 1 This is a main cross-sectional view of the present invention;

[0028] Figure 2 This is an exploded view of the present invention;

[0029] Figure 3 This is a schematic diagram of the hydraulic principle of the present invention;

[0030] Figure 4 This is a schematic diagram illustrating the assembly principle of the lifting and rotating piston drive motor housing of the present invention.

[0031] Figure 5 This is a schematic diagram of the piston and spindle assembly and gear ring of the present invention; wherein (a) is a diagram of the gear ring and ball meshing state, (b) is a diagram of the spindle and ball meshing state, (c) is a schematic diagram of the spindle track unfolding, and (d) is a schematic diagram of the gear ring track unfolding.

[0032] Figure 6 This is a diagram showing the state of the end face ball bearing during folding;

[0033] Figure 7 This is a diagram showing the state of the end face ball bearing during reset.

[0034] Figure 8 This is a schematic diagram of the lower ball bearing structure;

[0035] Figure 9 A schematic diagram showing a trapezoidal tooth structure for external meshing;

[0036] Figure 10 A schematic diagram of the piston body with a trapezoidal tooth structure;

[0037] Figure 11 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 view;

[0038] Figure 12 This is a schematic diagram of the arrangement of the planetary gear reducer assembly of the present invention;

[0039] Figure 13 This is a schematic diagram of the internal gear pump structure of the present invention;

[0040] Figure 14 This is a schematic diagram of the spindle assembly of the present invention;

[0041] Figure 15 This is a schematic diagram of the manual folding principle structure of the present invention;

[0042] Figure 16 This is a schematic diagram of the dustproof structure of the present invention;

[0043] Figure 17 Schematic diagram of the mounting holes for this invention Figure 1 ;

[0044] Figure 18 Schematic diagram of the mounting holes for this invention Figure 2 ;

[0045] Figure 19 This is a product assembly diagram of the present invention.

[0046] The components in the diagram are labeled as follows: 1-Motor housing, 2-DC motor, 3-Clutch assembly, 301-Input disc, 302-Meshing disc, 303-Diaphragm disc spring, 304-Output shaft, 305-First stage sun gear, 4-Planetary reducer assembly, 401-Sun gear retaining plate, 402-Sun gear, 403-External gear ring, 404-Planetary gear set, 405-Planet carrier, 5-Internal gear pump, 501-Sealing cover. 502-Pump top cover, 503-Main gear, 504-Pump gear ring, 505-Flow divider, 506-Pump bottom cover, 6-Piston assembly, 601-Cylinder block, 602-Internal meshing ball, 603-External meshing ball, 604-Internal meshing ball cage, 605-External meshing ball cage, 606-Trapezoidal meshing teeth, 7-Spindle assembly, 701-Spindle, 702-Limiting ring, 703-Spindle plastic-coated part, 704- Internal meshing track, 705-Upper steel sleeve, 706-Lower steel sleeve, 707-Upper end face ball, 708-Lower end face ball, 709-Upper end face ball cage, 710-Lower end face ball cage, 711-Upper end face steel plate, 712-Upper cover steel plate, 713-Lower cover steel plate, 714-Steel pipe, 715-Main shaft meshing inclined surface, 8-Gear ring, 801-External meshing track, 9-Rivet tube, 10-Hydraulic cylinder upper cover, 1 1-Hydraulic cylinder lower cover, 1101-Lower cylinder cover insert, 12-Spring assembly, 13-Motor cover, 14-Base, 1401-Base meshing slope, 15-Dust cover, 16-Motor bracket, 17-Hydraulic cylinder I zone, 18-Hydraulic cylinder II zone, 19-Hydraulic pipe, 20-Exterior rearview mirror base connection hole, 21-Exterior rearview mirror base plate connection hole, 22-Exterior rearview mirror base plate reinforcement connection hole, 23-Exterior rearview mirror base plate mating rib. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0048] like Figure 1 and 2As shown, an electric folding device for automotive exterior rearview mirrors includes a motor housing 1. The motor housing 1 has two chambers, one of which is a drive chamber containing a DC motor 2, a clutch assembly 3, a planetary reducer assembly 4, and an internal gear pump 5. The other chamber serves as a hydraulic transmission chamber, containing a gear ring 8, a piston assembly 6, a main shaft assembly 7, and a rivet tube 9. The DC motor 2 drives the internal gear pump 5 through the clutch assembly 3 and the planetary reducer assembly 4. The internal gear pump 5 drives the piston assembly 6 up and down through hydraulic oil. The cylinder 601 of the piston assembly 6 is mounted on the main shaft 701. The inner wall of the upper end of the cylinder has internal meshing balls 602, and the outer wall of the upper end of the cylinder has external meshing balls 603. The internal meshing balls 602 mesh with internal meshing tracks 704 on the main shaft, and the external meshing balls 603 mesh with external meshing tracks 801 on the inner wall of the gear ring 8.

[0049] like Figure 1 and 3 As shown, the upper end of the piston assembly forms hydraulic cylinder I zone 17, and the lower end forms hydraulic cylinder II zone 18. The end of hydraulic cylinder I zone 17 is closed by the upper cover 10, and the end of hydraulic cylinder II zone 18 is closed by the lower cover 11. Both hydraulic cylinder I zone 17 and hydraulic cylinder II zone 18 are connected to the internal gear pump 5 through hydraulic pipe 19. The internal gear pump 5 pressurizes the hydraulic oil and inputs it into hydraulic cylinder II zone 18. The hydraulic oil in hydraulic cylinder II zone 18 drives the piston assembly 6 to move. The piston moves along the track set on the main shaft assembly through the gear ring 8, causing the motor housing to generate upward linear and rotational motion, that is, driving the lens of the exterior rearview mirror to lift and fold. At the same time, the hydraulic oil in hydraulic cylinder I zone 17 flows into the internal gear pump through the hydraulic pipe for continuous oil supply.

[0050] like Figure 4 and 5 As shown, the inner meshing track 704 is divided into a straight section at the bottom and an inclined section at the top. The outer meshing track 801 is entirely an inclined section. Driven by hydraulic oil, the piston assembly causes the inner meshing ball 602 to first move upward along the straight section of the inner meshing track 602, and then the inner meshing ball 602 enters the inclined section of the inner meshing track 704. The inner meshing ball 602 and the outer meshing ball 603 are respectively limited by ball retainers, and the inclined guide distance of the outer meshing track is greater than that of the inner meshing track.

[0051] Driven by hydraulic oil, the piston moves the inner meshing ball 602 upwards along the straight section of the inner meshing track 704 of the main shaft assembly. Since the meshing track between the outer meshing ball 603 and the gear ring is inclined (with a larger lead), the piston will carry the motor housing 1 upwards along the main shaft, resulting in an upward movement for the exterior rearview mirror. When the piston moves upwards to the set value (… Figure 5 After the spindle track unfolds (4mm), the inner meshing ball 602 enters the inclined section of the inner meshing track 704 of the spindle assembly; at this time, the hydraulic cylinder cover assembly also touches the limit ring 702, and the upward movement of the motor housing 1 ends. However, under the continuous action of the hydraulic oil, the piston will inevitably continue to move; at this time, since the inner meshing ball 602 has entered the inclined section of the inner meshing track 704 of the spindle assembly, the piston will generate rotational motion in addition to moving upward. This rotational motion will also cause the outer meshing ball 603 to force the gear ring to rotate through the outer meshing track 801 of the gear ring, that is, the rearview mirror lens folds.

[0052] like Figures 6 to 8 As shown, the upper end of the spindle 701 is connected to a limiting ring 702, and the lower end is provided with a spindle plastic-coated part 703. The lower end of the limiting ring 702 and the upper end of the spindle plastic-coated part 703 are respectively provided with an upper end face ball 707 and a lower end face ball 708. The upper end face ball 707 and the lower end face ball 708 are limited by a ball retainer. The upper end face ball 707 is provided with an upper end face steel plate 711 above it and an upper cover steel plate 712 is provided at the position of the upper cover 10 of the hydraulic cylinder below it. The lower end face ball 708 is provided with a lower end steel sleeve 706 below it and a lower cover steel plate 713 is provided at the position of the lower cover 11 of the hydraulic cylinder above it. Meanwhile, the main shaft 707 is rotated and mounted on the rivet tube 9, and the inside of the main shaft is provided with a steel tube 714. The upper end of the main shaft is equipped with an upper steel sleeve 705, and the lower end of the main shaft is equipped with a lower steel sleeve 706. The lower end of the lower steel sleeve 706 extends horizontally in all directions to below the lower end ball bearing 708.

[0053] Thus, during the rotation of the motor housing, the use of end-face ball bearings at both ends of the main shaft effectively reduces motion resistance and frictional noise. Simultaneously, to ensure the motor is not damaged by the instantaneous impact force on the exterior rearview mirrors, two steel sleeves are installed on the main shaft. These sleeves are fitted with the steel plates in the upper and lower cover assemblies of the hydraulic cylinder with a clearance of 0.02~0.05mm. Figure 6 When the motor housing rotates (i.e., the exterior rearview mirror folds), the ball bearings on the upper surface contact the upper steel plate, resulting in rolling friction. Note that the motor housing has already been raised to the designed position at this time. Figure 7 When the motor housing resets (folds in the opposite direction, i.e., the exterior rearview mirror resets), the lower ball bearings contact the lower steel sleeve. At this point, rolling friction occurs. Note that the motor housing has not yet lowered in height; it is merely rotating. The internally meshing ball bearings on the piston are still in the inclined section of the internally meshing track on the main shaft. (The last sentence appears to be incomplete and possibly refers to a different motor housing.) Figure 8 The steel plate of the hydraulic cylinder lower cover assembly has four round holes distributed at 90°. When the motor reaches this position, the four steel balls will fall into the four round holes of the steel plate, ensuring the stability of the motor and preventing slight rotation during operation.

[0054] like Figure 9 and 10 As shown, the external meshing balls on the piston assembly can also be replaced with trapezoidal meshing teeth. Their motion principle is the same as that of meshing balls. The advantage is a simpler structure and easier manufacturing, but the disadvantage is higher motion resistance and lower output torque under the same hydraulic pressure.

[0055] like Figure 11 As shown, the clutch assembly 3 consists of an input disc 301, an engagement disc 302, a diaphragm disc spring 303, an output shaft 304, and a first-stage sun gear 305. The input disc and engagement disc are designed with toothed meshing. The diaphragm disc spring provides a certain pressure to engage the input disc and engagement disc. 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. However, when the resistance (torque) is greater than the rated value, the axial thrust generated by the inclined surface of the engagement teeth pushes the diaphragm disc spring to undergo elastic deformation, the engagement teeth disengage, and the DC motor idles, thus preventing overload and burnout, providing a protective function.

[0056] like Figure 12 As shown, the planetary gear reducer adopts an embedded motor bracket design. This design has the following advantages: (1) compact structure; (2) the outer gear ring of the planetary gear set is on the inner wall of the motor bracket, and the entire reducer has stable dimensions and good rigidity; (3) the gear set is in a multi-sealed state, which can isolate noise to the maximum extent even when lubricated.

[0057] like Figure 13 As shown, the internal gear pump can use an existing gear pump, which mainly includes a sealing cover 501, a pump upper cover 502, a main gear 503, a pump gear ring 504, a flow divider 505, a pump lower cover 506, and other parts.

[0058] like Figure 14 and 15 As shown, the main shaft is made of seamless steel pipe through flanging, stamping, machining, and injection molding (a steel sleeve needs to be inserted during injection molding). A spring assembly is installed between the upper end of the main shaft and the upper end of the rivet tube. The spring assembly includes a disc spring and spring washers at the upper and lower ends of the disc spring. Both the main shaft and the base have meshing inclined surfaces, which are normally engaged. Due to the spring force, the engagement is relatively firm, and there will be no loosening during normal vehicle operation. When the torque applied to the exterior rearview mirror lens by hand (this torque will ultimately be transmitted to the motor housing) exceeds a certain value, the axial component of the force generated by the meshing inclined surfaces of the main shaft and the base exceeds the spring force. The meshing surfaces disengage, and the motor housing + main shaft and base will rotate around the rivet tube, resulting in the manual folding of the exterior rearview mirror.

[0059] In addition, the motor's main shaft is fixed to the lens mount, and the motor housing is fixed to the lens; the main shaft has a steel sleeve as an insert; the motor housing is a plastic part, and the steel inserts are embedded in the cylinder heads at both ends during injection molding. This structural design ensures both low motion resistance and the overall rigidity and vibration resistance of the folding motor.

[0060] like Figure 16 As shown, a dust cover 15 is installed on the outside of the lower cylinder head insert 1101. The hard rubber of the dust cover and the soft rubber of the dust cover are combined using a two-color injection molding process.

[0061] like Figure 17 and 18 As shown, the motor is connected to the lens mount using three M3.5 screws, and to the lens base plate using three ST2.9 self-tapping screws. When the lens is lightweight (<900g), the lens base plate only needs to maintain an interference fit of 0.1mm with the mating rib on the motor head; when the lens is heavy (>900g), it is recommended to install two more ST2.9 self-tapping screws to mate with the reinforced connection holes on the exterior rearview mirror base plate.

[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. An electrically folding device for automotive exterior rearview mirrors, comprising a motor housing, characterized in that, The motor housing has two chambers, left and right. One chamber houses a DC motor, a clutch assembly, a planetary reducer assembly, and an internal gear pump. The other chamber houses a gear ring, a piston assembly, a main shaft assembly, and a riveting tube. The DC motor drives the internal gear pump through the clutch assembly and the planetary reducer assembly. The internal gear pump drives the piston assembly up and down through hydraulic oil. The cylinder of the piston assembly is mounted on the main shaft. The inner wall of the upper end of the cylinder has internal meshing balls, and the outer wall of the upper end of the cylinder has external meshing balls or trapezoidal meshing teeth. The internal meshing balls mesh with the internal meshing track on the main shaft, and the external meshing balls or trapezoidal meshing teeth mesh with the external meshing track on the inner wall of the gear ring. The internal meshing track is divided into a straight section at the bottom and an inclined section at the top. The external meshing track is entirely inclined. Driven by hydraulic oil, the internal meshing balls first move upward along the straight section of the internal meshing track, and then the internal meshing balls enter the inclined section of the internal meshing track.

2. The electric folding device for an automotive exterior rearview mirror according to claim 1, characterized in that, The piston assembly has a hydraulic cylinder I section at the upper end of the cylinder body and a hydraulic cylinder II section at the lower end. The end of hydraulic cylinder I section is closed by the upper cover of the hydraulic cylinder, and the end of hydraulic cylinder II section is closed by the lower cover of the hydraulic cylinder. Both hydraulic cylinder I and hydraulic cylinder II sections are connected to an internal gear pump via hydraulic pipes. The internal gear pump pressurizes the hydraulic oil and inputs it into hydraulic cylinder II section. The hydraulic oil in hydraulic cylinder II section drives the piston assembly to move. The piston moves along the track set on the main shaft assembly via the gear ring, causing the motor housing to generate upward linear and rotational motion, which drives the lens of the exterior rearview mirror to lift and fold. At the same time, the hydraulic oil in hydraulic cylinder I section flows into the internal gear pump through the hydraulic pipes for continuous oil supply.

3. The electrically folding device for an automotive exterior rearview mirror according to claim 1, characterized in that, The internal and external meshing balls are respectively limited by ball cages, and the slant lead of the external meshing track is greater than that of the external meshing track.

4. The electrically folding device for an automotive exterior rearview mirror according to claim 1, characterized in that, The upper end of the spindle is connected to a limit ring, and the lower end is provided with a spindle plastic coating. A base is provided below the spindle plastic coating. The spindle plastic coating and the base are engaged with each other through a convex-concave structure of meshing inclined surfaces.

5. An electric folding device for an automotive exterior rearview mirror according to claim 4, characterized in that, The upper end face ball and the lower end face ball are respectively provided below the limiting ring and above the main shaft plastic coating part. The upper end face ball and the lower end face ball are limited by the ball retainer. Furthermore, an upper end face steel plate is provided above the upper end face ball and an upper cover steel plate is provided at the corresponding position of the hydraulic cylinder cover below. A lower end steel sleeve is provided below the lower end face ball and a lower cover steel plate is provided at the corresponding position of the hydraulic cylinder cover above.

6. The electrically folding device for an automotive exterior rearview mirror according to claim 4, characterized in that, The main shaft is mounted on a rivet tube, and a steel tube is installed inside the main shaft. An upper steel sleeve is installed at the upper end of the main shaft, and a lower steel sleeve is installed at the lower end of the main shaft. The lower end of the lower steel sleeve extends horizontally in all directions to below the lower end ball bearing.

7. An electric folding device for an automotive exterior rearview mirror according to claim 4, characterized in that, A spring assembly is provided between the upper port of the spindle and the upper port of the rivet tube. The spring assembly includes a disc spring and spring washers located at the upper and lower ends of the disc spring.

8. The electrically folding device for an automotive exterior rearview mirror 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. An electric folding device for an automotive exterior rearview mirror according to claim 1, characterized in that, The planetary reducer assembly adopts an embedded motor bracket structure.

10. An electric folding device for an automotive exterior rearview mirror according to claim 2, characterized in that, The lower cover of the hydraulic cylinder is provided with a lower cylinder cover insert, and a dust cover is installed outside the lower cylinder cover insert. The dust cover is interference-fitted with the base.

Images