Small-size large-torque novel rearview mirror folding control system

Abstract

The utility model discloses a small-size large-torque novel rearview mirror folding control system which comprises an upper cover and a lower cover which are buckled together, a mirror rod fixing seat is rotatably installed at the top end of the upper cover, the top of the mirror rod fixing seat is fixedly connected with a rearview mirror rod through a mirror rod connecting seat, and the upper cover is fixedly connected with the lower cover through a fastening screw. A folding control unit is mounted in a driving cavity defined by the upper cover and the lower cover; the folding control unit comprises a main shaft installed between the upper cover and the lower cover, a worm gear fixedly arranged on the lower portion of the main shaft in a sleeving mode, a worm matched with the worm gear and a gear motor module driving the worm to move, and the top of the main shaft penetrates through the upper cover and is fixedly connected with the mirror rod fixing base. Compared with a comparison file, the driving is simpler and safer on the basis of the scheme; and the volume can be reduced by more than 60% compared with the volume in the same industry, so that not only are the appearance modeling and fuel economy of the vehicle body improved, but also the design universality and expandability are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rearview mirrors for commercial vehicles, and specifically relates to a novel rearview mirror folding control system with small volume and large torque. Background Art

[0002] In order to facilitate vehicles to pass through narrow alleys and other narrow sections, automobile rearview mirrors are designed with forward and backward folding functions. However, due to the characteristics of commercial vehicle rearview mirrors such as long cantilever, heavy weight, large folding torque, and poor vibration reduction effect, current commercial vehicle electric folding rearview mirrors all use a two-stage or higher worm gear reduction mechanism. This mechanism is large in size, and the decorative covering at the installation location needs to be raised high, affecting the appearance of the front and side of the vehicle body. At the same time, the increased wind resistance affects the fuel economy of the vehicle.

[0003] In view of the shortcomings of the current commercial vehicle rearview mirror electric folding control system, which is large in size and affects the appearance of the front and side panel decorative parts and fuel economy, a folding control system with small size and self-locking and limit functions is particularly needed.

[0004] Patent No. CN116215378A discloses a multi-mode folding control system for a commercial vehicle rearview mirror, comprising an upper cover, a lower cover and a mirror rod seat, a rotation guide limit device is installed between the mirror rod seat and the upper cover; a folding drive unit is installed in a driving cavity surrounded by the upper cover and the lower cover, the folding drive unit comprises a driving device, a reduction transmission device, a main shaft, a spring and a driving card seat, the top of the main shaft extends from the top of the upper cover and is fixedly connected to the mirror rod seat; the rearview mirror can be controlled to rotate to different angles according to needs, its structure is simple and reliable, and it can be matched with a motor to realize the electric and manual folding functions of the rearview mirror; when the driving card seat is connected to the reduction transmission device, the electric folding function is realized; when the driving card seat is disengaged from the reduction transmission device, the manual folding mode is realized; the two modes can be switched freely, which is convenient and flexible.

[0005] However, in the above patent, a spur worm gear mechanism is used for driving, which relies on the axial movement of the worm gear to achieve manual and electric folding functions. This mechanism has the risk that the worm gear cannot be separated from the worm mechanism. Utility Model Content

[0006] The utility model provides a novel rearview mirror folding control system with small volume and large torque, which solves the problems raised in the above background technology.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a small-volume and high-torque new rearview mirror folding control system, comprising an upper cover and a lower cover buckled together, a mirror rod fixing seat is rotatably installed on the top of the upper cover, the top of the mirror rod fixing seat is fixedly connected to the mirror rod of the rearview mirror through a mirror rod connecting seat, the upper cover is fixedly connected to the lower cover by fastening screws, and a folding control unit is installed in a driving cavity surrounded by the upper cover and the lower cover;

[0008] The folding control unit includes a main shaft installed between the upper cover and the lower cover, a worm gear fixedly sleeved on the lower part of the main shaft, a worm matched with the worm gear, and a reduction motor module driving the worm to move. The top of the main shaft passes through the upper cover and is fixedly connected to the mirror rod fixing seat, and the bottom of the main shaft is rotatably connected to the lower cover through the main shaft sleeve.

[0009] Preferably, a limiting boss is arranged on the outer side of the lower end of the mirror rod fixing seat, a fan-shaped groove matching the limiting boss is arranged on the outer side of the upper cover, a steel ball mounting hole is opened on the upper part of the upper cover and a steel ball is installed inside, and a circular groove matching the steel ball is arranged on the lower part of the mirror rod fixing seat.

[0010] Preferably, a semicircular groove and a retaining ring groove are provided at the lower end of the main shaft, a worm gear holder and a retaining ring are provided at the connection between the main shaft and the worm gear, a circular hole is provided in the center of the worm gear, and several groups of trapezoidal bosses are evenly distributed around the center, a semicircular hole matching the semicircular groove of the main shaft is provided in the middle of the worm gear holder, and a trapezoidal groove matching the trapezoidal boss of the worm gear is provided on the periphery of the worm gear holder.

[0011] Preferably, a U-shaped washer is sleeved on the lower part of the main shaft and located above the worm gear seat, and a vibration-damping spring is installed on the U-shaped washer.

[0012] Preferably, the reduction motor module is connected to the worm through a motor connecting shaft, the motor connecting shaft is installed on the lower cover through a connecting shaft sleeve, the top of the worm is fixedly connected through a worm sleeve and a top ball, and the bottom and sides of the reduction motor module are fixedly arranged on the reinforcement ribs of the lower cover.

[0013] Preferably, a circuit board installation box is installed below the reduction motor module, and the circuit board installation box is connected to the lower cover through self-tapping screws, a controllable circuit board is installed inside the circuit board installation box, and heat dissipation holes are opened at the bottom of the installation box.

[0014] The beneficial effects of adopting the above technical solution are:

[0015] 1. This solution can realize the forward and reverse rotation and overload protection functions of the rearview mirror by folding the control unit, and can limit the rotation angle of the rearview mirror when the mirror rod seat moves in the fan-shaped limit area outside the upper cover to avoid collision with the vehicle body.

[0016] 2. This solution effectively reduces the vibration of the rearview mirror during vehicle operation by installing a spring inside the electric folding control system, and realizes the electric folding function through the cooperation of the worm gear holder and the spring. After compressing the spring, the transmission force between the worm gear and the main shaft can be released, thereby realizing the manual folding function.

[0017] 3. Compared with the comparative documents, this solution avoids the risk of the worm gear being unable to disengage that may occur in the original patent, and improves the reliability and stability of the folding function, reducing the frequency of failures and repairs; and the volume can be reduced by more than 60% compared with the same industry, which not only improves the appearance and fuel economy of the car body, but also improves the versatility and scalability of the design. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an assembly drawing provided by the utility model;

[0019] Figure 2 is an assembly diagram of the folding control unit;

[0020] Figure 3 It is an exploded diagram provided by the utility model;

[0021] Figure 4 is a cross-sectional view of a folded control unit portion;

[0022] Figure 5 is a cross-sectional view of another part of the folding control unit;

[0023] Figure 6 is a cross-sectional view of the upper cover;

[0024] in:

[0025] 1. Mirror rod connecting seat; 2. Mirror rod fixing seat; 3. Steel ball; 4. Main shaft; 5. Upper cover; 6. Compression spring; 7. U-shaped washer; 8. Worm gear holder; 9. Worm gear; 10. Retaining ring; 11. Main shaft sleeve; 12. Lower cover; 13. Top ball; 14. Worm; 15. Worm sleeve; 16. Motor connecting shaft; 17. Connecting shaft sleeve; 18. Reducer motor module; 19. Control circuit board; 20. Circuit board installation box. DETAILED DESCRIPTION

[0026] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping technicians in the field to have a more complete, accurate and in-depth understanding of the concept and technical solution of the utility model and facilitating its implementation.

[0027] Specifically, Figures 1 to 6As shown, a novel rearview mirror folding control system with small volume and large torque comprises an upper cover 5 and a lower cover 12 which are buckled together, a mirror rod fixing seat 2 is rotatably mounted on the top of the upper cover 5, the top of the mirror rod fixing seat 2 is fixedly connected to the mirror rod of the rearview mirror through a mirror rod connecting seat 1, the upper cover 5 is fixedly connected to the lower cover 12 through a fastening screw, and a folding control unit is installed in a driving cavity surrounded by the upper cover 5 and the lower cover 12;

[0028] It should be noted that the upper cover 5 and the lower cover 12 are also positioned by two positioning pins, and the fastening screws are used to ensure that the upper cover 5, the lower cover 12 and the main shaft 4 are coaxial and concentric.

[0029] The folding control unit includes a main shaft 4 installed between the upper cover 5 and the lower cover 12, a worm gear 9 fixedly sleeved on the lower part of the main shaft 4, a worm 14 adapted to the worm gear 9, and a reduction motor module 18 for driving the worm 14 to move. The top of the main shaft 4 passes through the upper cover 5 and is fixedly connected to the mirror rod fixing seat 2, and the bottom of the main shaft 4 is rotatably connected to the lower cover 12 through the main shaft sleeve 11.

[0030] It should be noted that, compared with the folding drive unit in the reference document, the folding control unit in this solution has the following main differences:

[0031] 1. Inconsistent driving methods: the original motor drive drives the first-stage worm gear, the first-stage worm gear drives the second-stage worm gear, and the second-stage worm gear drives the second-stage worm gear. However, this patent adopts an integrated motor drive, where the motor and the multi-stage gear reduction mechanism are combined into a reduction control unit to drive the worm gear to rotate;

[0032] 2. Inconsistent limit structure: the original one uses internal limit mechanism, while this patent uses external limit mechanism;

[0033] 3. The worm gear mirror rod driving method is inconsistent: the original patent uses a straight-tooth worm gear mechanism, relying on the axial movement of the worm gear to achieve manual and electric folding functions. This mechanism has the risk that the worm gear cannot be separated from the worm gear mechanism. This patent drives the worm gear and the worm gear holder in reverse, and the worm gear is changed to helical teeth, relying on the axial movement of the worm gear holder to meet the manual folding function;

[0034] 4. Modularity: The original patent adopts a structure in which the mirror rod and the control unit are welded together. The structure is large in size, difficult to weld, and has high transportation and storage costs. This patent adopts a split structure and a screw connection structure, which can be assembled quickly. The control unit can be produced in a modular manner to improve efficiency.

[0035] 5. Small size: The original patent is bulky, and the decorative cover needs to be raised high, which affects the appearance of the front and side of the car body. At the same time, the increased wind resistance affects the fuel economy of the whole vehicle. This patent adopts an integrated motor control module and an external drive limit mechanism, so it is smaller than the original patent.

[0036] A limiting boss is arranged on the outer side of the lower end of the mirror rod fixing seat 2, and a fan-shaped groove matched with the limiting boss is arranged on the outer side of the upper cover 5. A steel ball mounting hole is opened on the upper part of the upper cover 5 and a steel ball 3 is installed inside. A circular groove matched with the steel ball 3 is arranged on the lower part of the mirror rod fixing seat 2.

[0037] It should be noted that the steel ball 3 and the circular groove are coated with grease, so as to ensure that the mirror rod fixing seat 2 can rotate easily around the main axis 4 relative to the upper cover 5, thereby reducing the rotational friction between the mirror rod fixing seat 2 and the upper cover 5;

[0038] In addition, the size of the fan-shaped groove limits the rotation angle of the main shaft, thereby playing a limiting role.

[0039] A semicircular groove and a retaining ring groove are provided at the lower end of the main shaft 4, a worm gear holder 8 and a retaining ring 10 are provided at the connection between the main shaft 4 and the worm gear 9, a circular hole is provided in the center of the worm gear 9, and a plurality of groups of trapezoidal bosses are evenly distributed around the center, a semicircular hole is provided in the middle of the worm gear holder 8 to match the semicircular groove of the main shaft 4, and a trapezoidal groove is provided on the periphery of the worm gear holder 8 to match the trapezoidal boss of the worm gear 9.

[0040] It should be noted that the retaining ring 10 is installed in the retaining ring groove of the main shaft 4 to limit the axial movement of the worm gear 9. When the worm gear 9 rotates, due to the axial restriction of the retaining ring 10 and the worm gear holder 8, the rotational force can only be transmitted to the worm gear holder 8 through the boss. The worm gear holder 8 drives the main shaft 4 to rotate, thereby driving the mirror rod fixing seat 2, the mirror rod connecting seat 1, and the mirror rod 24 to rotate.

[0041] A U-shaped washer 7 is sleeved on the lower part of the main shaft 4 and above the worm gear holder 8 , and a damping spring 6 is installed on the U-shaped washer 7 .

[0042] It should be noted that in order to ensure that the rearview mirror rod does not change its position by itself during driving, and to effectively reduce the vibration of the engine and the shaking of the rearview mirror caused by different road surfaces, a shock-absorbing spring 6 is installed on the upper part of the U-shaped washer 7. Under the action of the spring, the worm gear seat 8 and the worm gear 9 are pressed to fit closely, and at the same time, the different vibration frequencies transmitted by the road surface and the engine can be effectively offset.

[0043] The reduction motor module 18 is connected to the worm 14 through a motor connecting shaft 16, and the motor connecting shaft 16 is installed on the lower cover 12 through a connecting shaft sleeve 17. The top of the worm 14 is fixedly connected through a worm sleeve 15 and a top ball 13, and the bottom and side of the reduction motor module 18 are fixedly arranged on the reinforcing ribs of the lower cover 12.

[0044] It should be noted that the spindle sleeve 15 cooperates with the lower cover to ensure that the mirror rod fixing seat 2, the upper cover 5, the lower cover 12 are coaxial and concentric with the spindle 4, and improve wear resistance to ensure service life. The top of the worm 14 is fixed to the lower cover 12 by the top ball 13 to reduce rotational friction and increase service life. The bottom and side of the reduction motor module 18 are fixed on the reinforcement ribs of the lower cover 12, thereby ensuring that the output shafts of the worm 14 and the reduction motor module 18 are on the same axis.

[0045] A circuit board installation box 20 is installed below the reduction motor module 18, and the circuit board installation box 20 is connected to the lower cover 12 through self-tapping screws. A controllable circuit board 19 is installed inside the circuit board installation box 20, and heat dissipation holes are opened at the bottom of the installation box 20.

[0046] It should be noted that, in order to protect the motor, the motor input end is connected to the controllable circuit board 19. When the mirror rod fixing seat 2 is rotated to both sides of the fan-shaped groove of the upper cover 5, the limit block plays a limiting role. At this time, the motor current becomes larger. When the current exceeds the set threshold, the output end of the circuit board 19 is immediately powered off, so that the folding unit stops rotating, and overload protection is achieved;

[0047] In addition, in order to reduce the volume of the control unit and ensure effective heat dissipation and sealing of the controllable circuit board 19, the controllable circuit board 19 is installed in a circuit board mounting box 20. The circuit board mounting box 20 has heat dissipation holes at the bottom and is installed on the lower side of the reduction motor module 18. The wiring harness is connected through the wiring harness through hole in the lower cover. One end of the circuit board mounting box 20 is fixed to the lower cover 12 with a plug-in structure, and the other end is fastened to the lower cover 12 with a self-tapping screw 21.

[0048] The specific working method is described below with specific embodiments: Example 1

[0049] During operation, after the reduction motor module 18 is energized, it drives the worm 14 to rotate, and drives the main shaft 4 to rotate through the worm wheel 9 and the worm wheel holder 8, thereby driving the mirror rod fixing seat 2, the mirror rod connecting seat 1, and the mirror rod to rotate around the center of the main shaft 4, and finally drives the lens to rotate around the main shaft 4, realizing the electric folding function of the rearview mirror lens. When the power is reversed, the reduction motor rotates in the reverse direction, thereby driving the worm wheel to rotate in the reverse direction, realizing the reverse rotation of the lens.

[0050] When the mirror rod needs to be rotated manually, when the mirror rod is swung by hand, the mirror rod fixing seat 2 drives the main shaft 4, and the main shaft 4 drives the worm gear holder 8 to rotate around the axial direction. Because the worm gear has a self-locking function, the worm wheel cannot drive the worm gear to rotate. The lower part of the worm wheel 9 is restricted by the main shaft retaining ring 10, and the worm wheel cannot move downward, forcing the trapezoidal groove on the worm gear holder 8 to disengage from the trapezoidal boss of the worm wheel 9, thereby compressing the spring. When the trapezoidal boss and the trapezoidal groove are disengaged, the mirror rod is manually rotated, thereby realizing the manual folding function. Example 2

[0051] In order to ensure that the rearview mirror rod does not change its position by itself during driving and to effectively reduce the vibration of the engine and the shaking of the rearview mirror caused by different road surfaces, a damping spring 6 is installed on the upper part of the U-shaped washer 7. Under the action of the spring, the worm gear seat 8 and the worm gear 9 are pressed to fit closely, and the different vibration frequencies transmitted by the road surface and the engine can be effectively offset.

[0052] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above-mentioned concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A novel rearview mirror folding control system with small volume and large torque, comprising an upper cover (5) and a lower cover (12) which are buckled together, a mirror rod fixing seat (2) being rotatably mounted on the top of the upper cover (5), the top of the mirror rod fixing seat (2) being fixedly connected to the mirror rod of the rearview mirror via a mirror rod connecting seat (1), the upper cover (5) being fixedly connected to the lower cover (12) via a fastening screw, characterized in that: A folding control unit is installed in the driving cavity surrounded by the upper cover (5) and the lower cover (12); The folding control unit comprises a main shaft (4) installed between an upper cover (5) and a lower cover (12), a worm wheel (9) fixedly sleeved on the lower part of the main shaft (4), a worm (14) matched with the worm wheel (9), and a reduction motor module (18) for driving the worm (14) to move; the top of the main shaft (4) passes through the upper cover (5) and is fixedly connected to the mirror rod fixing seat (2); the bottom of the main shaft (4) is rotatably connected to the lower cover (12) via a main shaft sleeve (11).

2. A novel small-volume and high-torque rearview mirror folding control system according to claim 1, characterized in that: A limiting boss is arranged on the outer side of the lower end of the mirror rod fixing seat (2), a fan-shaped groove matching the limiting boss is arranged on the outer side of the upper cover (5), a steel ball mounting hole is opened on the upper part of the upper cover (5) and a steel ball (3) is mounted inside, and a circular groove matching the steel ball (3) is arranged on the lower part of the mirror rod fixing seat (2).

3. The novel small-volume and high-torque rearview mirror folding control system according to claim 1 is characterized in that: A semicircular groove and a retaining ring groove are formed at the lower end of the main shaft (4); a worm gear holder (8) and a retaining ring (10) are provided at the connection between the main shaft (4) and the worm gear (9); a circular hole is provided at the center of the worm gear (9), and a plurality of groups of trapezoidal bosses are evenly distributed around the center; a semicircular hole matching the semicircular groove of the main shaft (4) is provided in the middle of the worm gear holder (8), and a trapezoidal groove matching the trapezoidal boss of the worm gear (9) is provided on the periphery of the worm gear holder (8).

4. A novel small-volume and high-torque rearview mirror folding control system according to claim 3, characterized in that: A U-shaped washer (7) is sleeved on the lower part of the main shaft (4) and located above the worm gear holder (8), and a vibration-damping spring (6) is installed on the U-shaped washer (7).

5. The novel small-volume and high-torque rearview mirror folding control system according to claim 1 is characterized in that: The reduction motor module (18) is connected to the worm (14) via a motor connecting shaft (16); the motor connecting shaft (16) is mounted on the lower cover (12) via a connecting shaft sleeve (17); the top of the worm (14) is fixedly connected via a worm sleeve (15) and a top bead (13); the bottom and side of the reduction motor module (18) are fixedly arranged on the reinforcing ribs of the lower cover (12).

6. The novel small-volume and high-torque rearview mirror folding control system according to claim 1 is characterized in that: A circuit board installation box (20) is installed below the reduction motor module (18), and the circuit board installation box (20) is connected to the lower cover (12) via self-tapping screws. A controllable circuit board (19) is installed inside the circuit board installation box (20), and a heat dissipation hole is provided at the bottom of the installation box (20).

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