A multi-mode folding control system for a commercial vehicle mirror

Abstract

The application discloses a multi-mode folding control system for a rearview mirror of a commercial vehicle, which comprises an upper cover, a lower cover and a mirror rod base, a rotating guide limiting device is arranged between the mirror rod base and the upper cover, a folding driving unit is arranged in a driving cavity surrounded by the upper cover and the lower cover, the folding driving unit comprises a driving device, a speed reduction transmission device, a main shaft, a spring and a driving clamping base, the top end of the main shaft extends from the top end of the upper cover and is fixedly connected with the mirror rod base, the rearview mirror can be controlled to rotate different angles according to requirements, the structure is simple, the reliability is high, and the rearview mirror can be matched with a motor to realize electric and manual folding functions; when the driving clamping base is in transmission connection with the speed reduction transmission device, the electric folding function is realized; when the driving clamping base is disconnected with the speed reduction transmission device, the manual folding mode is realized; the two modes can be freely switched, and the system is convenient and flexible.

Description

Technical Field

[0001] This invention relates to the field of automotive rearview mirror technology, and more particularly to a multi-mode folding control system for commercial vehicle rearview mirrors. Background Technology

[0002] To facilitate vehicles' passage through narrow alleys and other confined spaces, car rearview mirrors are designed with front and rear folding functions. Currently, rearview mirror folding comes in two types: manual and electric. For passenger car rearview mirrors, due to their short cantilever and light weight, electric folding is a mature product, and the electric folding module has become standardized. Commercial vehicles, however, have rearview mirrors with larger body extensions due to varying cargo box widths. Furthermore, the larger mirror size results in greater weight and folding torque. Additionally, commercial vehicles are freight vehicles, employing leaf spring damping structures on both front and rear axles. Their operating conditions are more complex, leading to significantly lower overall vibration damping compared to passenger cars. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a simple and highly reliable multi-mode folding control system for commercial vehicle rearview mirrors, which can be matched with a 12V or 24V motor to realize electric and manual folding functions of the rearview mirrors.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: a multi-mode folding control system for commercial vehicle rearview mirrors, including an upper cover and a lower cover fastened together, wherein a mirror rod seat connected to the mirror rod is rotatably mounted on the top of the upper cover; a rotation guide limiting device is installed between the mirror rod seat and the upper cover; a folding drive unit is installed in the drive cavity formed by the upper cover and the lower cover, and the output end of the folding drive unit extends from the top of the upper cover and is fixedly connected to the mirror rod seat;

[0005] The folding drive unit includes a main shaft rotatably mounted between the upper cover and the lower cover. The top end of the main shaft extends from the top end of the upper cover and is fixedly connected to the mirror rod seat. A spring is fitted on the main shaft and located in the drive cavity. A drive bracket is fixedly mounted on the main shaft. A drive device is installed in the drive cavity. A speed reduction transmission device is installed between the power output end of the drive device and the drive bracket. The drive bracket and the speed reduction transmission device are engaged and driven. The spring presses the speed reduction transmission device tightly onto the drive bracket.

[0006] As a preferred technical solution, the rotary guide limiting device includes a plurality of large ball bearings rotatably mounted on the top surface of the upper cover. The large ball bearings are circumferentially distributed around the main shaft. An annular groove that mates with the large ball bearings is provided on the end face of the mirror rod seat facing the upper cover. A fan-shaped limiting groove is also provided on the top surface of the upper cover, and a limiting block that extends into the fan-shaped limiting groove is provided on the mirror rod seat.

[0007] As a preferred technical solution, a main shaft sleeve is snapped into the lower cover, and the bottom end of the main shaft is rotatably installed in the main shaft sleeve.

[0008] As a preferred technical solution, a large washer is fitted on the main shaft between the spring and the upper cover, the top end of the spring presses the large washer against the upper cover, and the bottom end of the spring presses against the speed reduction transmission device.

[0009] As a preferred technical solution, the driving device includes a motor mount fixedly installed between the upper cover and the lower cover, a drive motor fixedly installed on the motor mount, and the power output end of the drive motor being connected to the reduction transmission device.

[0010] As a preferred technical solution, the speed reduction transmission device includes a vertically arranged primary worm and a secondary worm. The primary worm is connected to the power output shaft of the drive motor. A primary worm wheel that meshes with the primary worm is fixedly installed on the secondary worm. A secondary worm wheel that engages with the drive jack is mounted on the main shaft. The secondary worm meshes with the secondary worm wheel. The secondary worm wheel is installed between the spring and the drive jack.

[0011] As a preferred technical solution, the center of the secondary worm gear is provided with a mounting slot, the drive mounting slot is fixedly mounted on the main shaft and extends into the mounting slot, a snap-fit ​​device is provided between the bottom of the mounting slot and the top of the drive mounting slot, the snap-fit ​​device includes a plurality of snap-fit ​​grooves circumferentially distributed at the bottom of the mounting slot, and the top of the drive mounting slot is provided with a snap-fit ​​protrusion that matches the snap-fit ​​groove.

[0012] As a preferred technical solution, the first-stage worm gear is installed between the motor base and the lower cover, and a worm washer is installed at each end of the first-stage worm gear. The upper worm washer abuts against the motor base, and the lower worm washer abuts against the lower cover.

[0013] As a preferred technical solution, at least one worm sleeve is fitted onto the secondary worm gear, the worm sleeve is snapped onto the motor base, and both ends of the secondary worm gear are connected to the upper cover via small ball bearings.

[0014] As a preferred technical solution, the bottom end of the spindle is provided with a D-shaped shaft section, and the center of the drive jack is provided with a D-shaped hole that mates with the D-shaped shaft section of the spindle; a retaining ring located below the drive jack is fixedly installed on the spindle.

[0015] Thanks to the above-mentioned technical solution, this commercial vehicle rearview mirror multi-mode folding control system can control the rearview mirror to rotate at different angles according to needs. It has a simple structure and high reliability, and can be matched with a 12V or 24V motor to realize the electric and manual folding functions of the rearview mirror. When the drive cassette is connected to the reduction gear, the electric folding function is realized; when the drive cassette is disengaged from the reduction gear, the manual folding mode is realized. The two modes can be switched freely, which is convenient and flexible. Attached Figure Description

[0016] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

[0017] Figure 1 This is a perspective view of the internal structure of an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention;

[0019] Figure 3 yes Figure 2 AA section view in the middle;

[0020] Figure 4 yes Figure 2 BB section view in the middle;

[0021] Figure 5 yes Figure 2 CC section view in the middle;

[0022] Figure 6 yes Figure 2 DD section view in the middle;

[0023] Figure 7 This is an exploded view of an embodiment of the present invention;

[0024] In the diagram: 11-Upper cover; 12-Lower cover; 13-Mirror rod seat; 21-Main spindle; 22-Main spindle sleeve; 23-Spring; 24-Large washer; 31-Large ball; 32-Sector-shaped limiting groove; 33-Limiting block; 41-Motor seat; 42-Drive motor; 43-First-stage worm; 44-First-stage worm wheel; 45-Worm washer; 46-Motor connecting shaft; 51-Second-stage worm; 52-Second-stage worm wheel; 53-Drive bracket; 54-Snap-fit ​​groove; 55-Snap-fit ​​protrusion; 56-Worm sleeve; 57-Small ball; 58-Retaining ring. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0026] like Figures 1 to 7 As shown, a multi-mode folding control system for a commercial vehicle rearview mirror includes an upper cover 11 and a lower cover 12 fastened together. A mirror rod seat 13 is rotatably mounted on the top of the upper cover 11, and a rearview mirror rod is fixedly mounted on the mirror rod seat 13. A rotation guide limiting device is installed between the mirror rod seat 13 and the upper cover 11. A folding drive unit is installed in the drive cavity formed by the upper cover 11 and the lower cover 12. The output end of the folding drive unit extends from the top of the upper cover 11 and is fixedly connected to the mirror rod seat 13. The folding drive unit includes components rotatably mounted on the upper cover 11 and the lower cover 12. A main shaft 21 is located between the lower cover 12. The top end of the main shaft 21 extends from the top end of the upper cover 11 and is fixedly connected to the mirror rod seat 13. A spring 23 located in the drive cavity is fitted on the main shaft 21. A drive bracket 53 is fixedly installed on the main shaft 21. The drive bracket 53 is a circular bracket. A drive device is installed in the drive cavity. A speed reduction transmission device is installed between the power output end of the drive device and the drive bracket 53. The drive bracket 53 and the speed reduction transmission device are engaged and driven. The spring 23 presses the speed reduction transmission device tightly onto the drive bracket 53.

[0027] The rotary guide limiting device includes multiple large ball bearings 31 rotatably mounted on the top surface of the upper cover 11. These large ball bearings 31 are circumferentially distributed around the main shaft 21. The end face of the mirror rod seat 13 facing the upper cover 11 has an annular groove (not shown) that mates with the large ball bearings 31. A fan-shaped limiting groove 32 is also provided on the top surface of the upper cover 11, and a limiting block 33 extending into the fan-shaped limiting groove 32 is provided on the mirror rod seat 13. A main shaft sleeve 22 is snapped into the lower cover 12, and the bottom end of the main shaft 21 is rotatably mounted within the main shaft sleeve 22, restricting the radial movement of the main shaft 21. A large washer 24 is fitted onto the main shaft 21 between the spring 23 and the upper cover 11. The top end of the spring 23 presses the large washer 24 against the upper cover 11, and the bottom end of the spring 23 presses against the reduction transmission device. The upper part of the large washer 24 contacts the upper cover 11, and the lower part contacts the spring 23, which can prevent the spring 23 from wearing the upper cover 11.

[0028] The driving device includes a motor base 41 fixedly installed between the upper cover 11 and the lower cover 12. A drive motor 42 is fixedly installed on the motor base 41 and is bolted to the motor base 41. The power output end of the drive motor 42 is connected to the reduction transmission device. The reduction transmission device includes a vertically arranged primary worm 43 and a secondary worm 51. The primary worm 43 is connected to the power output shaft of the drive motor 42. A primary worm wheel 44 that meshes with the primary worm 43 is fixedly installed on the secondary worm 51. A secondary worm wheel 52 that engages with the drive jack 53 is fitted on the main shaft 21. The secondary worm 51 and the secondary worm wheel 52 mesh with each other. The secondary worm wheel 52 is installed between the spring 23 and the drive jack 53.

[0029] The secondary worm gear 52 has a center slot for mounting a card holder. The drive card holder 53 is fixedly mounted on the main shaft 21 and extends into the slot for mounting a card holder. A snap-fit ​​device is provided between the bottom of the slot for mounting a card holder and the top of the drive card holder 53. The snap-fit ​​device includes a plurality of snap-fit ​​grooves 54 circumferentially distributed at the bottom of the slot for mounting a card holder. The top of the drive card holder 53 is provided with snap-fit ​​protrusions 55 that match the snap-fit ​​grooves 54.

[0030] The primary worm gear 43 is installed between the motor base 41 and the lower cover 12. A worm washer 45 is installed at each end of the primary worm gear 43. The upper worm washer 45 abuts against the motor base 41, and the lower worm washer 45 abuts against the lower cover 12. When the primary worm gear 43 moves, it reduces friction between parts, ensuring smooth operation of the reduction mechanism. It also prevents direct contact and wear between the primary worm gear 43, motor base 41, and lower cover 12, thus improving component lifespan. At least one worm sleeve 56 is fitted onto the secondary worm gear 51, and the worm sleeve 56 is snapped onto the motor base 41. Two worm sleeves 56 are installed on the secondary worm gear 51, respectively fitted onto both sides of the threaded section of the secondary worm gear 51. Both ends of the secondary worm gear 51 are connected to the upper cover 11 via small ball bearings 57. The small ball bearings 57 reduce friction between the contact surfaces of the secondary worm gear 51 and the upper cover 11, extending service life.

[0031] The bottom end of the main shaft 21 is provided with a D-shaped shaft section. The cross section of the D-shaped shaft section is D-shaped and has a plane. The center of the drive jack 53 is provided with a D-shaped hole that mates with the D-shaped shaft section of the main shaft 21. With the cooperation of the D-shaped hole and the D-shaped shaft section, the main shaft 21 can rotate synchronously with the drive jack 53. A retaining ring 58 located below the drive jack 53 is fixedly installed on the main shaft 21. The retaining ring 58 provides an axial lower limit for the drive jack 53.

[0032] The vehicle body is equipped with a body mounting bracket, on which the rearview mirror system is installed. The body mounting bracket is compatible with different vehicle models and has mounting holes for both the vehicle body and the rearview mirror system. The body mounting bracket can be screwed to the vehicle body for secure installation. The rearview mirror rod is a round tubular profile, compatible with different vehicle models. The rearview mirror rod and mirror rod seat 13 are fixed together by welding or screwing. The main body of the rearview mirror system is cylindrical and contains a reduction mechanism and control circuitry. It can be screwed to the aforementioned body mounting bracket and thus fixed to the vehicle body as a whole.

[0033] The mirror rod holder 13 has a through hole and a circular groove. The main shaft 21 can pass through the through hole and connect to the mirror rod holder 13. The rearview mirror rod can be welded into the circular groove. The lower part of the main shaft 21 is stepped and has a groove for installing the main shaft sleeve 22 and the retaining ring 58. The main shaft sleeve 22 is installed at the stepped end of the main shaft 21, with the inner ring fitted onto the main shaft 21 and the outer ring secured inside the groove of the lower cover 12.

[0034] The upper cover 11 has multiple circular grooves and through holes on its upper disc. A fan-shaped limiting area is provided at the mating point with the mirror rod seat 13. The upper cover 11 has a boss inside, and the main shaft 21 can pass through the aforementioned through holes to mate with the upper cover 11. The large ball bearings 31 are installed in the aforementioned circular grooves of the upper cover 11. The three large ball bearings 31 are arranged in a circle, with an included angle of 120° between each pair of large ball bearings 31. The mirror rod seat 13 has a corresponding annular groove below it that matches the large ball bearings 31, forming a rotating structure. The large ball bearings 31 are made of steel balls, which reduces friction and rotational torque during rotation. The lower cover 12 has a protruding structure inside to support the motor seat 41, the reduction mechanism, and the upper cover 11. The lower cover 12 is bolted to the upper cover 11 to form a closed housing.

[0035] The large washer 24 and the spring 23 are sequentially mounted on the main shaft 21. The surface of the large washer 24 is in contact with the inner surface of the upper cover 11, and the spring 23 is placed on the other surface of the large washer 24. The diameter of the large washer 24 is larger than the diameter of the spring 23.

[0036] The motor base 41 is provided with a positioning post, a worm gear holder, and a PCB holder. The motor base 41 is placed inside the cavity formed by the upper cover 11 and the lower cover 12, and is connected to the upper cover 11 and the lower cover 12. The upper part of the motor base 41 is mounted on the upper cover 11 and positioned by the positioning post, and the lower part is mounted on the lower cover 12. The three of them constitute the main support structure of the control unit.

[0037] The secondary worm gear 52 has a circular groove on its surface as a mounting slot for the ferrule. At the bottom of the circular groove are three trapezoidal grooves as engaging grooves 54. These trapezoidal grooves are circumferentially distributed around the main shaft 21, with an included angle of 120° between each pair of grooves. The secondary worm gear 52 has a circular through hole in its center and is fitted onto the main shaft 21 with a clearance fit. The drive ferrule 53 is circular with a D-shaped through hole at its center. The drive ferrule 53 has three trapezoidal protrusions on its surface as engaging protrusions 55. These protrusions engage with the aforementioned trapezoidal grooves, and are circumferentially distributed with an included angle of 120° between each pair. The secondary worm gear 52 and the drive jack 53 are matched by the trapezoidal groove and the trapezoidal protrusion, and can be engaged together. After matching, they are installed as a whole on the main shaft 21. The secondary worm gear 52 is in contact with the spring 23. Under the action of the spring 23, the two can realize the force transmission between the secondary worm gear 52 and the drive jack 53. The spring 23 is always kept in a compressed state, so that the secondary worm gear 52 and the drive jack 53 maintain a tight fit when the drive motor 42 starts. The retaining ring 58 is placed in the groove of the main shaft 21. The retaining ring 58 is in contact with the drive jack 53 to prevent the drive jack 53 from moving radially. The secondary worm gear 52 meshes with the secondary worm 51. The diameter of the secondary worm gear 52 is larger than that of the secondary worm 51. The worm gear mechanism of the secondary worm gear 52 completes the deceleration and amplifies the torque. The worm sleeve 56 is installed on the secondary worm 51. The worm sleeve 56 is placed in the U-shaped groove of the worm gear holder of the motor base 41 to ensure the radial stability of the secondary worm 51 and reduce friction. The two ends of the secondary worm 51 abut against the small balls 57, which are placed in the groove of the upper cover 11. The small balls 57 are made of steel balls. The small balls 57 can restrict the axial movement of the secondary worm 51, ensuring the axial stability of the secondary worm 51 and reducing friction.

[0038] The primary worm gear 44 is mounted on the secondary worm 51. When the motor starts, the primary worm gear 44 drives the secondary worm 51 to rotate at the same angular velocity. The primary worm gear 44 meshes with the primary worm 43. The diameter of the primary worm gear 44 is larger than that of the primary worm 43. The worm gear mechanism of the primary worm gear 44 reduces speed and amplifies torque. The primary worm 43 is stepped, with a worm washer 45 installed at the step. The worm washer 45 contacts the motor base 41 and the lower cover 12. The primary worm 43 is connected to the motor connecting shaft 46 of the drive motor 42. The power output end of the drive motor 42 is connected to the motor connecting shaft 46. The power output end of the drive motor 42 has axial threads. The drive motor 42 is bolted to the motor base 41. When the drive motor 42 starts, it drives the motor connecting shaft 46 and the primary worm 43 to rotate at the same angular velocity.

[0039] Since the main shaft 21 passes through the upper cover 11 and is fitted with a main shaft sleeve 22 at the bottom, the concentricity of the main shaft 21 during rotation can be ensured. At the same time, the internal spring 23 can effectively reduce the vibration of the rearview mirror during vehicle operation.

[0040] The drive motor 42 is connected to a control circuit. The PCB circuit board of the control circuit is rectangular and has various electronic components. The PCB circuit board is snapped onto the PCB slot of the motor base 41 to ensure that the PCB circuit board does not affect the operation of other components during use.

[0041] The mirror rod holder 13 is welded to the main shaft 21. The fan-shaped limiting groove 32 on the upper cover 11 and the limiting block 33 on the mirror rod holder 13 cooperate to limit the rotation angle of the rearview mirror. When it rotates to the limit position, the control circuit can realize overload protection. The control circuit can control the drive motor 42 to achieve forward and reverse rotation through electronic components. When the mirror rod holder 13 rotates to the limit position, the current in the circuit increases. When the current exceeds the set threshold, the control circuit can detect the response signal and immediately disconnect the power supply of the drive motor 42, so that the main shaft 21 stops rotating, realizing overload protection.

[0042] When the drive motor 42 starts, because the spring 23 is always in a compressed state, the secondary worm gear 52 is engaged with the drive cassette 53. The secondary worm gear 52 can drive the drive cassette 53 and the main shaft 21 to rotate at the same angular velocity. When the mirror rod needs to be rotated manually, the drive cassette 53 will disengage from the secondary worm gear 52 due to the force, causing the secondary worm gear 52 to move axially and further compress the spring 23, causing the drive cassette 53 to disengage from the worm gear reduction mechanism, and simultaneously releasing the self-locking of the worm gear structure. At this time, the main shaft 21 only drives the drive cassette 53 to rotate at the same angular velocity to achieve the manual folding function.

[0043] This rearview mirror system has the following functions:

[0044] 1. After the drive motor 42 starts, the drive motor 42 drives the main shaft 21 and the mirror rod seat 13 to rotate after being reduced in speed by a two-stage worm gear mechanism. After the two-stage reduction, the rotation speed of the mirror rod is moderate, which makes it easy to adjust the rearview mirror angle.

[0045] 2. When the mirror rod seat 13 moves within the fan-shaped limiting area of ​​the upper cover 11, it can limit the rotation angle of the rearview mirror and avoid collision with the vehicle body.

[0046] 3. The drive motor 42 is connected to the control circuit, which can realize the forward and reverse rotation of the rearview mirror and the overload protection function.

[0047] 4. A spring 23 is provided on the main shaft 21, which can effectively reduce the vibration of the rearview mirror during vehicle operation.

[0048] 5. A spring 23 and a drive bracket 53 are installed on the main shaft 21, enabling electric folding. Compressing the spring 23 releases the self-locking characteristic of the worm gear, enabling manual folding.

[0049] 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 present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents. .

Claims

1. A multi-mode folding control system for a commercial vehicle rearview mirror comprising an upper cover and a lower cover snapped together, characterized in that: A mirror rod seat connected to the rearview mirror rod is rotatably mounted on the top of the upper cover; a rotation guide limiting device is installed between the mirror rod seat and the upper cover; a folding drive unit is installed in the drive cavity formed by the upper cover and the lower cover, and the output end of the folding drive unit extends from the top of the upper cover and is fixedly connected to the mirror rod seat. The folding drive unit includes a main shaft rotatably mounted between the upper cover and the lower cover. The top end of the main shaft extends from the top end of the upper cover and is fixedly connected to the mirror rod seat. A spring is fitted on the main shaft and located in the drive cavity. A drive bracket is fixedly mounted on the main shaft. A drive device is installed in the drive cavity. A speed reduction transmission device is installed between the power output end of the drive device and the drive bracket. The drive bracket and the speed reduction transmission device are engaged and driven. The spring presses the speed reduction transmission device tightly onto the drive bracket.

2. The multi-mode folding control system for a commercial vehicle rearview mirror of claim 1, characterized in that: The rotary guide limiting device includes multiple large ball bearings rotatably mounted on the top surface of the upper cover. The large ball bearings are circumferentially distributed around the main shaft. An annular groove that mates with the large ball bearings is provided on the end face of the mirror rod seat facing the upper cover. A fan-shaped limiting groove is also provided on the top surface of the upper cover. A limiting block that extends into the fan-shaped limiting groove is provided on the mirror rod seat.

3. The multi-mode folding control system for a commercial vehicle rearview mirror of claim 1, wherein: The lower cover is fitted with a main shaft sleeve, and the bottom end of the main shaft is rotatably mounted inside the main shaft sleeve.

4. The multi-mode folding control system for a commercial vehicle rearview mirror of claim 1, wherein: A large washer is fitted on the main shaft between the spring and the upper cover. The top end of the spring presses the large washer against the upper cover, and the bottom end of the spring presses against the speed reduction transmission device.

5. The multi-mode folding control system for a commercial vehicle rearview mirror of claim 1, wherein: The drive device includes a motor mount fixedly installed between the upper cover and the lower cover, a drive motor fixedly installed on the motor mount, and the power output end of the drive motor is connected to the reduction transmission device.

6. The multi-mode folding control system for a commercial vehicle rearview mirror of claim 5, characterized by: The speed reduction transmission device includes a vertically arranged primary worm and a secondary worm. The primary worm is connected to the power output shaft of the drive motor. A primary worm wheel that meshes with the primary worm is fixedly installed on the secondary worm. A secondary worm wheel that engages with the drive jack is mounted on the main shaft. The secondary worm meshes with the secondary worm wheel. The secondary worm wheel is installed between the spring and the drive jack.

7. The multi-mode folding control system for a commercial vehicle rearview mirror of claim 6, characterized by: The center of the secondary worm gear is provided with a locating groove. The drive locating is fixedly mounted on the main shaft and extends into the locating groove. A snap-fit ​​device is provided between the bottom of the locating groove and the top of the drive locating. The snap-fit ​​device includes multiple snap-fit ​​grooves circumferentially distributed at the bottom of the locating groove. The top of the drive locating is provided with a snap-fit ​​protrusion that matches the snap-fit ​​groove.

8. The multi-mode folding control system for a commercial vehicle rearview mirror of claim 6, wherein: The first-stage worm gear is installed between the motor base and the lower cover. A worm washer is installed at each end of the first-stage worm gear. The upper worm washer abuts against the motor base, and the lower worm washer abuts against the lower cover.

9. The multi-mode folding control system for a commercial vehicle rearview mirror of claim 6, wherein: At least one worm sleeve is fitted onto the secondary worm gear, and the worm sleeve is snapped onto the motor base. Both ends of the secondary worm gear are connected to the upper cover via small ball bearings.

10. The multi-mode folding control system for a commercial vehicle rearview mirror of any one of claims 1-9, wherein: The bottom end of the main shaft is provided with a D-shaped shaft section, and the center of the driving clamping seat is provided with a D-shaped hole matched with the D-shaped shaft section of the main shaft. The main shaft is fixedly installed with a stop ring below the driving clamping seat.

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