Easy-to-disengage low-resistance folding mechanism for rearview mirror

Abstract

The application provides a rearview mirror easy-to-disengage low-resistance folding mechanism, which comprises a rotating shaft provided with a stop shoulder at an upper end, the rotating shaft is sequentially penetrated through a folding base and a disengaging base and is fixed with a base at a lower end, a disengaging spring, an upper wear-resistant ring, a gear ring and a pushing ring are sequentially sleeved on the rotating shaft from the lower surface of the stop shoulder to the upper surface of the folding base, a lifting spring and a lower wear-resistant ring are sequentially sleeved on the rotating shaft from the upper surface of the disengaging base to the lower surface of the folding base, the folding base is provided with a motor for rotating the folding base relative to the gear ring, the disengaging base is further provided with a rotatable supporting cylinder, the lower end of the supporting cylinder is provided with a disengaging groove, and the disengaging base is provided with a disengaging protrusion. The application has the advantages that the rotating resistance can be effectively reduced, the gap between the rotating structures is reduced after the rotating and unfolding are completed, the wind noise is reduced, the gap between the rotating structures is reserved for cleaning in the folding state, the disengaging mechanism is internally arranged, the service life is prolonged and the disengaging flexibility is improved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts, specifically to a rearview mirror easy-clutch low-resistance folding mechanism. Background Technology

[0002] Existing traditional rearview mirror modules include a base connected to the vehicle body or door, a rotating shaft fixedly connected to the base, and a clutch base and a folding base arranged sequentially from bottom to top, all fitted around the rotating shaft. The folding base houses a drive motor and components such as a gear ring and a pressure-holding spring fitted around the rotating shaft. The pressure-holding spring provides downward pressure to the folding base and clutch base, allowing the upper clutch slider at the lower end of the clutch base to be fitted with the lower clutch slider of the base at a fixed angle. This ensures that when the rearview mirror folds inward or outward due to external impact, the upper and lower clutch sliders can be engaged and disengaged by their inclined surfaces, preventing the rearview mirror from breaking. When the rearview mirror is normally folded and unfolded, the motor drives the folding base to rotate relative to the clutch base. Due to the pressure of the pressure-holding spring, the folding base experiences significant resistance when rotating relative to the clutch base. Over time, dust and dirt can cause problems such as jamming during rotation.

[0003] To address the aforementioned issues, the applicant filed an application on December 5, 2025, and published it on January 30, 2026, for a low-resistance rearview mirror folding device with application number CN202511825012.2. The device includes a rotating shaft with a shoulder at its upper end. The lower end of the rotating shaft passes sequentially through a folding base and a clutch base before being fixed to a base. A clutch spring, an upper wear-resistant ring, a gear ring, and a shift ring are sequentially fitted onto the rotating shaft from the lower surface of the shoulder towards the upper surface of the folding base. A lifting spring and a lower wear-resistant ring are sequentially fitted onto the rotating shaft from the upper surface of the clutch base towards the lower surface of the folding base. The folding base is equipped with a motor that rotates the folding base relative to the gear ring. This invention has the advantages of effectively reducing rotational resistance, minimizing gaps between rotating structures and reducing wind noise after the rotating structure is fully extended, and providing cleaning space between the rotating structures in the folded state, facilitating maintenance.

[0004] Although the aforementioned patent solved the relevant problems, the applicant discovered during subsequent product verification that, when subjected to an accidental impact, the clutch is engaged by "the upper clutch slider climbing up the clutch ramp to above the lower clutch slider and compressing the clutch spring to force the folding base and clutch base to rotate together to relieve the force" (a self-protecting clutch state for the rearview mirror to retract or flip outward upon accidental impact). Due to the large rotation diameter of the base and clutch base, the clutch is not flexible enough due to the excessively long lever arm. At the same time, since the upper and lower clutch sliders are exposed, problems such as dried grease and dust adhesion on the clutch surface are easily caused, which further aggravates the resistance during clutch engagement. Summary of the Invention

[0005] Based on the above problems, the purpose of this invention is to provide a rearview mirror easy-clutch low-resistance folding mechanism that can effectively reduce rotational resistance, reduce the gap between rotating structures and reduce wind noise after rotating and unfolding into place, reserve cleaning space between rotating structures in the folded state for easy maintenance, and integrate the clutch mechanism to extend service life and clutch flexibility.

[0006] To address the above problems, the following technical solution is provided: a rearview mirror easy-clutch low-resistance folding mechanism, comprising a rotating shaft with a shoulder at its upper end, the lower end of the rotating shaft passing sequentially through a folding base and a clutch base and then fixed to a base; a clutch spring, an upper wear-resistant ring, a gear ring, and a shift ring are sequentially fitted onto the rotating shaft from the lower surface of the shoulder towards the upper surface of the folding base; a lifting spring and a lower wear-resistant ring are sequentially fitted onto the rotating shaft from the upper surface of the clutch base towards the lower surface of the folding base; the folding base is equipped with a motor for rotating the folding base relative to the gear ring. The lower surface of the gear ring is provided with downwardly extending paddles and upwardly recessed unlocking grooves, each paddle and unlocking groove being a plurality of such paddles and arranged at intervals along the circumferential direction of the gear ring; the upper surface of the dial ring is provided with upwardly protruding unlocking blocks that correspond to and fit the unlocking grooves; the inner ring wall of the dial ring is provided with a plurality of lifting sliders arranged at intervals along its circumferential direction; the bottom surface of the lifting sliders is provided with a lifting ramp at the junction with the side corresponding to the unfolding direction of the folding base; the lower surface of the folding base is provided with a plurality of locking grooves arranged at intervals along its circumferential direction; the clutch base is... The surface is provided with a locking block adapted to the locking groove. The upper surface of the clutch base also has a support cylinder at its center, passing through a lifting spring, a lower wear-resistant ring, and a folding base, and rotatably mounted with the clutch base. The outer wall of the support cylinder has a lifting groove extending from top to bottom. A lifting slope is provided at the junction of the bottom of the lifting groove and the groove wall corresponding to the unfolding direction of the folding base. The paddle is located within the lifting groove, and the lifting slider is located between the paddle and the groove wall on the side of the lifting groove with the lifting slope, with the lifting slope and the lifting slope mutually adapted to each other. The lower end face of the support cylinder is provided with clutch grooves spaced apart along its circumferential direction. The clutch base is provided with clutch protrusions that are adapted to the clutch grooves. The lower end of the clutch spring pushes the upper wear-resistant ring and the toothed ring downwards and applies the elastic force to the bottom of the lifting groove through the paddle, so that the clutch grooves and the clutch protrusions engage with each other to achieve circumferential positioning. When the folding base is folded due to an external impact, the clutch grooves move upwards along the clutch protrusions and disengage from each other, so that the entire folding base rotates and relieves the force. The lifting spring pushes the lower wear-resistant ring to abut against the lower surface of the folding base.

[0007] The present invention is further configured such that the base has a plurality of fixing holes spaced apart along its circumferential direction on the side facing the clutch base; the clutch base has fixing posts spaced apart along its circumferential direction on the side facing the base; the fixing posts are inserted into the fixing holes and fixedly connected by screws.

[0008] The present invention is further configured such that the motor output shaft is provided with a driving worm; the folding base is also provided with a driven worm that meshes with a gear ring, and the driven worm is provided with a worm wheel adapted to the driving worm.

[0009] The present invention is further configured such that the lifting spring is a butterfly spring, with its inner ring higher than its outer ring; the outer ring of the butterfly spring abuts against the upper surface of the clutch base, and the inner ring abuts against the lower surface of the lower wear-resistant ring; the locking block passes through the elastic groove of the outer ring of the butterfly spring and provides circumferential degree of freedom constraint for the butterfly spring.

[0010] The invention is further configured such that the unlocking groove is fan-shaped along the circumferential direction of the gear ring, and the two ends of the fan-shaped groove are provided with guide slopes; the unlocking block is fan-shaped along the circumferential direction of the dial ring, and the two ends of the fan-shaped groove are provided with guide slopes.

[0011] The invention is further configured such that: the lower surface of the dial ring is provided with a fan-shaped downward protrusion anti-bend block along its circumferential direction; the anti-bend block is provided with an anti-bend upper inclined surface on one side corresponding to the unfolding direction of the folding base; the upper surface of the folding base is provided with an anti-bend groove along its circumferential direction; the anti-bend groove is provided with an anti-bend lower inclined surface on one side corresponding to the unfolding direction of the folding base; when the folding base is folded, the anti-bend block slides in a fan shape within the anti-bend groove; the anti-bend block and anti-bend groove are in multiple sets and are evenly distributed along the circumferential direction of the dial ring.

[0012] The present invention is further configured such that the outer wall of the base is provided with a first positioning member spaced apart along the circumferential direction of the folding base; the folding base is provided with a second positioning member adapted to the first positioning member and limiting its rotation angle range.

[0013] The present invention is further configured such that the folding base also includes a lens holder.

[0014] The present invention is further configured such that both ends of the clutch groove and the clutch protrusion in the circumferential direction are provided with clutch inclined surfaces.

[0015] The present invention is further configured such that, in the unfolded state of the folding base, the unlocking block abuts against the lower surface of the gear ring, and the dial ring presses down on the folding base to bring it close to / fit against the clutch base. At this time, the lower wear-resistant ring moves downward and compresses the lifting spring; and the locking block is embedded in the locking groove to constrain the circumferential degree of freedom between the two.

[0016] S1. When the motor is powered on, the folding begins. The gear ring is under stress and rotates clockwise relative to the clutch base. The paddle moves clockwise and pushes the lifting slider to rotate the dial ring clockwise. At this time, the lifting slope contacts the supporting slope. At the same time, the unlocking block begins to unlock in accordance with the unlocking slot, providing upward space for the dial ring to be inserted into the subsequent upward movement.

[0017] S2. As the gear ring rotates clockwise relative to the clutch base, the lifting slider moves upward along the lifting slope under the push of the paddle, and the paddle ring moves upward and fits with the gear ring, causing the unlocking block to enter the unlocking groove; at this time, the lifting spring pushes the folding base upward through the lower wear-resistant ring, causing the folding base to separate from the clutch base and creating an upward gap to reduce friction. At the same time, the locking block disengages from the locking groove to unlock the circumferential degree of freedom between the folding base and the clutch base.

[0018] S3. As the gear ring rotates clockwise relative to the clutch base, the paddle, unlocking block, and lifting groove form a rigid contact. At this time, the folding base begins to rotate counterclockwise under the drive of the reverse force until it is folded in place.

[0019] S4. When the folded position is in place, the top of the locking block and the bottom of the folding base are supported against each other, so that the lifting gap between the folding base and the clutch base is always maintained.

[0020] The invention is further configured such that when the motor is powered on and begins to unfold the folding base in its folded state, the folding base rotates clockwise under the reverse force of the gear ring; when the folding base is unfolded to its final position, the locking block realigns with the locking groove to leave axial space for the folding base to fall. At this time, the end face of the anti-folding groove abuts against the end face of the anti-folding block, forcing the folding base to drive the dial ring to generate a clockwise rotation torque. Meanwhile, the gear ring generates a counterclockwise torque under the drive of the motor, and its lifting slider is constrained by the other side of the lifting groove. At this time, the gear ring is moving counterclockwise, and the dial ring is moving clockwise, resulting in a circumferential angle difference that causes the unlocking block to slide out of the unlocking groove, thereby pushing the dial ring downward and pushing the folding base to fall so that the locking block engages with the locking groove for positioning. At this time, the unfolding is completed and the positioning state is entered.

[0021] The invention is further configured such that locking slopes are provided on both sides of the locking groove and the locking block.

[0022] The beneficial effects of this invention are:

[0023] 1. When folding, lift the folding base to reduce the friction between the folding base and the clutch base, thereby reducing rotational resistance; at the same time, when unfolded, the folding base and the clutch base are close to each other, which can effectively reduce gaps and reduce wind noise.

[0024] 2. By setting the support cylinder and clutch base into a structure that can rotate relative to each other, the clutch groove and clutch protrusion are engaged by the clutch spring to form a circumferential constraint positioning. When the rearview mirror encounters an external force at any angle position, causing it to fold or flip outward, the folding base acts as the first force-bearing component and transmits the rotation to the support cylinder through the motor, gear ring, and shift ring. When the force of the groove moving upward along the clutch protrusion is greater than the thrust of the clutch spring, the clutch spring is compressed and disengaged, and the clutch groove and clutch protrusion separate, causing the support cylinder to rotate relative to the clutch base, thereby relieving the force and protecting the motor, gear ring, shift ring, and other components inside the rearview mirror.

[0025] 3. Because the diameter of the support cylinder is smaller than that of the prior patent, the lever arm in the circumferential direction is shorter when unloading, making it easier to engage the clutch. This results in a lower torsional force threshold required to open the unloading mechanism, greatly reducing the stress burden on the gear ring when it is subjected to impact.

[0026] 4. Meanwhile, since the clutch groove and clutch protrusion are located inside the folding base and are protected by the folding base, they can effectively prevent dust and moisture from entering and grease from being lost. Compared with the exposed structure of the existing patent, it has a longer service life and smoother operation.

[0027] 5. The base and clutch base are connected by a fixing post and a fixing hole, and are fixed with screws. Compared with the existing patent, its clutch mechanism is located between the base and the clutch base, which is more stable.

[0028] 6. The upward gap formed when folded makes cleaning and maintenance easier and also reduces friction when unfolded. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention with the lens holder in the unfolded state.

[0030] Figure 2 This is a three-dimensional structural diagram of the lens holder of the present invention, which folds inward when subjected to an external impact.

[0031] Figure 3 This is a three-dimensional structural diagram of the lens holder of the present invention, which flips outward due to an external impact.

[0032] Figure 4 This is a first-view three-dimensional structural diagram of the lens holder and base in a separated state according to the present invention.

[0033] Figure 5 This is a first-view three-dimensional structural diagram of the lens holder and base in a separated state according to the present invention.

[0034] Figure 6 This is a three-dimensional structural diagram of the motor in the separated state according to the present invention.

[0035] Figure 7 This is a three-dimensional structural diagram of the unfolded folding base of the present invention.

[0036] Figure 8 For the present invention Figure 7 A partial cross-sectional structural diagram.

[0037] Figure 9 This is a schematic diagram of the three-dimensional structure of the S1 state of the present invention.

[0038] Figure 10 For the present invention Figure 9 A partial cross-sectional structural diagram.

[0039] Figure 11 This is a schematic diagram of the three-dimensional structure of the S2 state of the present invention.

[0040] Figure 12 For the present invention Figure 11 A partial cross-sectional structural diagram.

[0041] Figure 13 This is a schematic diagram of the three-dimensional structure of the S3 state of the present invention.

[0042] Figure 14 For the present invention Figure 13 A partial cross-sectional structural diagram.

[0043] Figure 15 This is a schematic diagram of the full cross-sectional structure of the folding base and gear ring of the present invention.

[0044] Figure 16 This is a schematic diagram showing the full cross-sectional structure of the rotating shaft, gear ring, dial ring, folding base, and lower wear-resistant ring of the present invention.

[0045] Figure 17 This is a schematic diagram of the rotating cross-sectional structure of the toothed ring, derailleur ring, and folding base of the present invention.

[0046] Figure 18 This is a first-view three-dimensional structural diagram of the local explosion of the present invention.

[0047] Figure 19 This is a two-dimensional structural diagram of the local explosion from a second perspective according to the present invention.

[0048] Figure 20 This is a first-view perspective three-dimensional structural diagram of the explosion of the present invention.

[0049] Figure 21 This is a two-dimensional structural diagram of the explosion from a second perspective of the present invention.

[0050] Figure 22 This is a schematic diagram of the full cross-sectional three-dimensional structure of the present invention.

[0051] Figure 23 This is a three-dimensional structural diagram of the support cylinder in a disengaged state when subjected to external force impact and folding.

[0052] Figure 24 For the present invention Figure 23 A schematic diagram of the full sectional three-dimensional structure.

[0053] The labels in the diagram mean: 10-rotating shaft; 11-shoulder; 20-folding base; 21-locking groove; 22-anti-folding groove; 221-anti-folding lower slope; 23-second positioning component; 30-clutch base; 301-clutch protrusion; 31-locking block; 32-support cylinder; 321-lifting groove; 322-lifting slope; 323-clutch groove; 33-fixing post; 34-clutch slope; 40-base; 41-fixing hole; 42-first positioning component; 50-clutch spring; 51-upper wear-resistant ring; 52 - Lifting spring; 521- Inner ring; 522- Outer ring; 523- Elastic groove; 53- Lower wear-resistant ring; 54- Motor; 541- Driving worm gear; 542- Circuit board; 56- Driven worm gear; 561- Worm wheel; 57- Guide slope; 58- Locking slope; 60- Gear ring; 61- Paddle; 62- Unlocking groove; 70- Paddle ring; 71- Unlocking block; 72- Lifting slider; 721- Lifting slope; 73- Anti-bending block; 731- Anti-bending upper slope; 80- Lens bracket; 90- Lifting gap. Detailed Implementation

[0054] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0055] Note: To facilitate understanding of the folding and clockwise / counterclockwise rotation directions, this technical solution uses the left rearview mirror as a reference.

[0056] refer to Figures 1 to 24 ,like Figures 1 to 24The rearview mirror easy-clutch low-resistance folding mechanism shown includes a rotating shaft 10 with a shoulder 11 at its upper end. The lower end of the rotating shaft 10 passes through a folding base 20 and a clutch base 30 in sequence and is fixed to a base 40. A clutch spring 50, an upper wear-resistant ring 51, a gear ring 60, and a shift ring 70 are sequentially fitted onto the rotating shaft 10 from the lower surface of the shoulder 11 toward the upper surface of the folding base 20. A lifting spring 52 and a lower wear-resistant ring 53 are sequentially fitted onto the rotating shaft 10 from the upper surface of the clutch base 30 toward the lower surface of the folding base 20. The folding base 20 is provided with a motor 54 for rotating the folding base 20 relative to the gear ring 60. The lower surface of the gear ring 60... The clutch 60 is provided with a downwardly extending paddle 61 and an upwardly recessed unlocking groove 62. Several paddles 61 and unlocking grooves 62 are arranged at intervals along the circumferential direction of the gear ring 60. The upper surface of the clutch ring 70 has an upwardly protruding unlocking block 71 that corresponds to and fits the unlocking groove 62. The inner ring wall of the clutch ring 70 has several lifting sliders 72 arranged at intervals along its circumferential direction. A lifting inclined surface 721 is provided at the junction of the bottom surface of each lifting slider and the side corresponding to the unfolding direction of the folding base 20. The lower surface of the folding base 20 has several locking grooves 21 arranged at intervals along its circumferential direction. The upper surface of the clutch base 30 has locking grooves that fit the locking grooves 21. Block 31, the clutch base 30 has a support cylinder 32 at the center of its upper surface, through which the lifting spring 52, the lower wear-resistant ring 53, and the folding base 20 pass, and is rotatably arranged with the clutch base 30. The outer wall of the support cylinder 32 has a lifting groove 321 that runs from top to bottom. The bottom of the lifting groove 321 and the groove wall on the side corresponding to the unfolding direction of the folding base 20 have a lifting inclined surface 322. The paddle 61 is located in the lifting groove 321. The lifting slider 72 is located between the paddle 61 and the groove wall on the side of the lifting groove 321 with the lifting inclined surface 322, and the lifting inclined surface 322 and the lifting inclined surface 721 are mutually adapted. The support cylinder 32 The lower end face is provided with clutch grooves 323 spaced apart along its circumferential direction. The clutch base 30 is provided with clutch protrusions 301 adapted to the clutch grooves 323. The lower end of the clutch spring 50 pushes the upper wear-resistant ring 51 and the gear ring 60 downward and applies the elastic force to the bottom of the lifting groove 321 through the paddle 61, so that the clutch grooves 323 and the clutch protrusions 301 engage with each other to achieve circumferential positioning. When the folding base 20 is folded due to an external impact, the clutch grooves 323 move upward along the clutch protrusions 301 and disengage from each other, so that the entire folding base 20 rotates and relieves the force. The lifting spring 52 pushes the lower wear-resistant ring 53 to abut against the lower surface of the folding base 20.

[0057] In the above structure, the folding base 20 is raised during folding to reduce the friction between the folding base 20 and the clutch base 30, thereby reducing rotational resistance. Simultaneously, in the unfolded state, the folding base 20 and the clutch base 30 are close together, effectively reducing gaps and wind noise. By setting the support cylinder 32 and the clutch base 30 as a relatively rotatable structure, the clutch groove 323 and the clutch protrusion 301 engage under the push of the clutch spring 50 to form a circumferential constraint positioning. When the rearview mirror encounters external force at any angle position, causing it to fold or flip outward, the folding base 20 acts as the first force-bearing component, and the rotation is transmitted to the support cylinder 32 via the motor 54, gear ring 60, and shift ring 70. The force exerted by the groove 323 along the clutch protrusion 301 is greater than that of the clutch spring 50. When the clutch spring 50 is pushed, it compresses and retracts, and the clutch groove 323 and clutch protrusion 301 separate, causing the support cylinder 32 to rotate relative to the clutch base 30, thereby dissipating the force and protecting the motor 54, gear ring 60, derailleur ring 70 and other components inside the rearview mirror. Since the diameter of the support cylinder 32 is smaller than that of the prior patent, the lever arm in the circumferential direction is shorter when dissipating the force, making it easier to engage the clutch and lowering the torsional force threshold required to engage the dissipation. This greatly reduces the stress burden on the gear ring 60 when it is subjected to impact. At the same time, since the clutch groove 323 and clutch protrusion 301 are located inside the folding base 20 and are protected by the folding base 20, it can effectively prevent dust and moisture from entering and grease from being lost. Compared with the exposed structure of the existing patent, it has a longer service life and smoother operation.

[0058] In this embodiment, the base 40 facing the clutch base 30 is provided with a plurality of fixing holes 41 spaced apart along its circumferential direction; the clutch base 30 facing the base 40 is provided with fixing posts 33 spaced apart along its circumferential direction; the fixing posts 33 are inserted into the fixing holes 41 and fixedly connected by screws (not shown in the figure).

[0059] In the above structure, the base 40 and the clutch base 30 are connected by the fixing post 33 and the fixing hole 41, and are fixed with screws (not shown in the figure). Compared with the existing patent, the design structure of the clutch mechanism located between the base 40 and the clutch base 30 is more stable.

[0060] In this embodiment, the output shaft of the motor 54 is provided with a driving worm 541; the folding base 20 is also provided with a driven worm 56 that meshes with the gear ring 60, and the driven worm 56 is provided with a worm wheel 561 that is adapted to the driving worm 541.

[0061] In the above structure, the torque is increased by deceleration, which effectively avoids jamming; at the same time, the motor 54 is equipped with a circuit board 542, which determines whether the motor 54 is folded or unfolded in place by detecting the input current (stalled current) of the motor 54.

[0062] In this embodiment, the lifting spring 52 is a butterfly spring, with its inner ring 521 higher than its outer ring 522; the outer ring 522 of the butterfly spring abuts against the upper surface of the clutch base 30, and the inner ring 521 abuts against the lower surface of the lower wear-resistant ring 53; the locking block 31 passes through the elastic groove 523 of the outer ring 522 of the butterfly spring and provides circumferential freedom constraint for the butterfly spring.

[0063] In the above structure, the disc spring has the advantages of good support and thinness.

[0064] In this embodiment, the unlocking groove 62 is fan-shaped along the circumferential direction of the gear ring 60, and guide slopes 57 are provided at both ends of the fan-shaped direction; the unlocking block 71 is fan-shaped along the circumferential direction of the dial ring 70, and guide slopes 57 are provided at both ends of the fan-shaped direction.

[0065] In the above structure, both the unlocking groove 62 and the unlocking block 71 are provided with guide slopes 57, which makes the transition smoother when the two are joined or separated.

[0066] In this embodiment, the lower surface of the dial ring 70 is provided with a fan-shaped anti-bend block 73 protruding downward along its circumferential direction. The anti-bend block 73 is provided with an anti-bend upper inclined surface 731 on one side corresponding to the unfolding direction of the folding base 20. The upper surface of the folding base 20 is provided with an anti-bend groove 22 protruding downward along its circumferential direction. The anti-bend groove 22 is provided with an anti-bend lower inclined surface 221 on one side corresponding to the unfolding direction of the folding base 20. When the folding base 20 is folded, the anti-bend block 73 slides in a fan shape within the anti-bend groove 22. There are multiple sets of anti-bend blocks 73 and anti-bend grooves 22, which are evenly distributed along the circumferential direction of the dial ring 70.

[0067] In the above structure, when the folding base 20 is unfolded into place, the end of the anti-folding block 73 away from the anti-folding upper inclined surface 731 abuts against the end of the anti-folding groove 22 away from the anti-folding lower inclined surface 221. Since the dial ring 70 is adapted to the lifting groove 321 of the support cylinder 32 through the lifting slider 72, and the support cylinder 32 is constrained and fixed with the clutch base 30 in the circumferential direction, the folding base 20 is forced to generate circumferential resistance (i.e., limiting resistance) in the clockwise direction. This resistance will cause the motor 54 to rotate and the load will increase, causing it to generate a stall current which is detected by the circuit board 542, thereby disconnecting the power supply to the motor 54.

[0068] In this embodiment, the outer wall of the base 40 is provided with a first positioning member 42 spaced apart along the circumferential direction of the folding base 20; the folding base 20 is provided with a second positioning member 23 adapted to the first positioning member 42 and limiting its rotation angle range.

[0069] In the above structure, there are preferably two first positioning members 42, which are arranged at intervals in the circumferential direction of the rotation of the folding base 20. The second positioning member 23 is located between adjacent first positioning members 42 and is used to limit the extreme angle between the folding and outward folding sections. At the same time, when the folding is in place, the first positioning member 42 and the second positioning member 23 are used to increase the rotational load of the motor 54, so that the stall current is generated and detected by the circuit board 542, thereby disconnecting the power supply to the motor 54.

[0070] In this embodiment, the folding base 20 also includes a lens holder 80.

[0071] In the above structure, the lens holder 80 is used to install the rearview lens (not shown in the figure); the second positioning member 23 is located on the lens holder 80.

[0072] In this embodiment, both ends of the clutch groove 323 and the clutch protrusion 301 in the circumferential direction are provided with clutch inclined surfaces 34.

[0073] In the above structure, when it is folded and flipped outward due to an external impact, the clutches can be staggered along the clutch ramp 34.

[0074] In this embodiment, when the folding base 20 is unfolded, the unlocking block 71 abuts against the lower surface of the gear ring 60, and the dial ring 70 presses down on the folding base 20 to bring it closer to / fit against the clutch base 30. At this time, the lower wear-resistant ring 53 moves downward and compresses the lifting spring 52; and the locking block 31 is embedded in the locking groove 21 to constrain the circumferential degree of freedom between the two (refer to...). Figure 7 , Figure 8 );

[0075] S1. When the motor 54 is powered on, the folding begins. The gear ring 60 is under stress and rotates clockwise relative to the clutch base 30. The paddle 61 moves clockwise and pushes the lifting slider 72, causing the shift ring 70 to rotate clockwise. At this time, the lifting inclined surface 721 contacts the supporting inclined surface 322. Simultaneously, the unlocking block 71 begins to unlock itself in accordance with the unlocking slot 62, providing upward space for the subsequent upward insertion of the shift ring 70 (see reference). Figure 9 , Figure 10 );

[0076] S2. As the gear ring 60 rotates clockwise relative to the clutch base 30, the lifting slider 72, pushed by the paddle 61, has its lifting ramp 721 move upward along the supporting ramp 322. The paddle ring 70 moves upward and engages with the gear ring 60, causing the unlocking block 71 to enter the unlocking groove 62. At this time, the lifting spring 52 pushes the folding base 20 upward through the lower wear-resistant ring 53, causing the folding base 20 to separate from the clutch base 30, creating an upward gap 90 to reduce friction. Simultaneously, the locking block 31 disengages from the locking groove 21, unlocking the circumferential degree of freedom between the folding base 20 and the clutch base 30 (see reference). Figure 11 , Figure 12);

[0077] S3. As the gear ring 60 rotates clockwise relative to the clutch base 30, the paddle 61, unlocking block 71, and lifting groove 321 form rigid contact. At this time, driven by the reverse force, the folding base 20 begins to rotate counterclockwise until it is folded in place (see reference). Figure 13 , Figure 14 );

[0078] S4. When the folded position is in place, the top of the locking block 31 and the bottom surface of the folding base 20 are supported against each other, so that the upward gap 90 between the folding base 20 and the clutch base 30 is always maintained.

[0079] In the above structure, the upward gap 90 formed in the folded state facilitates cleaning and maintenance, and also reduces friction when unfolded. (Note that, in order to demonstrate the positional change of the folding base 20 during the folding process, the gap is designed to facilitate cleaning and maintenance.) Figure 8 , Figure 10 , Figure 12 , Figure 14 The folding base 20 is cut through a cylindrical virtual section, so it appears to be cylindrical.

[0080] In this embodiment, when the motor 54 is energized and the folding base 20 begins to unfold in the folded state, the folding base 20 rotates clockwise under the reverse force of the gear ring 60. When the folding base 20 is unfolded to the correct position, the locking block 31 realigns with the locking groove 21 to leave axial space for the folding base 20 to fall. At this time, the end face of the anti-folding groove 22 abuts against the end face of the anti-folding block 73, forcing the folding base 20 to drive the dial ring 70 to generate a clockwise rotation torque. Meanwhile, the gear ring 60 generates a counterclockwise torque under the drive of the motor 54, and its lifting slider 72 is constrained by the other side of the lifting groove 321. At this time, the gear ring 60 is moving counterclockwise and the dial ring 70 is moving clockwise, and the resulting circumferential angle difference causes the unlocking block 71 to slide out of the unlocking groove 62, thereby pushing the dial ring 70 to move downward and pushing the folding base 20 to fall, so that the locking block 31 engages with the locking groove 21 for positioning. At this time, the unfolding is completed and the positioning state is entered.

[0081] In the above structure, after entering the positioning state, the resistance of motor 54 increases sharply, and the stall current generated is detected by circuit board 542, thereby disconnecting the power supply to motor 54.

[0082] In this embodiment, locking groove 21 and locking block 31 are provided with locking slopes 58 on both sides.

[0083] In the above structure, the locking ramp 58 engages and disengages more smoothly with the locking groove 21 and the locking block 31.

[0084] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications assumed above should also be considered within the scope of protection of the present invention.

Claims

1. A rearview mirror easy-clutch low-resistance folding mechanism, comprising a rotating shaft with a shoulder at its upper end, the lower end of the rotating shaft passing sequentially through a folding base and a clutch base and then fixed to a base, characterized in that: A clutch spring, an upper wear-resistant ring, a gear ring, and a shift ring are sequentially fitted onto the shaft extending from the lower surface of the shoulder towards the upper surface of the folding base. A lifting spring and a lower wear-resistant ring are sequentially fitted onto the shaft extending from the upper surface of the clutch base towards the lower surface of the folding base. The folding base is equipped with a motor that rotates the folding base relative to the gear ring. The lower surface of the gear ring has a downwardly extending shift piece and an upwardly recessed unlocking groove. Several shift pieces and unlocking grooves are arranged at intervals along the circumferential direction of the gear ring. The upper surface of the shift ring has an upwardly protruding unlocking block that corresponds to and matches the unlocking groove. The inner ring wall of the shift ring has several lifting sliders arranged at intervals along its circumferential direction. A lifting slope is provided at the junction of the bottom surface of the lifting slider and the side corresponding to the unfolding direction of the folding base. The lower surface of the folding base has several locking grooves arranged at intervals along its circumferential direction. The upper surface of the clutch base has a locking block that matches the locking groove. The center of the upper surface of the clutch base also has a spring that passes through it. The system comprises a lower wear-resistant ring, a folding base, and a support cylinder rotatably mounted to the clutch base. The outer wall of the support cylinder has a lifting groove extending from top to bottom. A lifting ramp is located at the junction of the bottom of the lifting groove and the groove wall corresponding to the unfolding direction of the folding base. A lever is located within the lifting groove, and a lifting slider is located between the lever and the groove wall on the side with the lifting ramp, with the lifting ramp and the lifting ramp mutually compatible. The lower end face of the support cylinder has clutch grooves spaced circumferentially, and the clutch base has clutch protrusions compatible with these grooves. The lower end of the clutch spring pushes the upper wear-resistant ring and gear ring downwards, and the elastic force is applied to the bottom of the lifting groove via the lever, causing the clutch grooves and clutch protrusions to engage for circumferential positioning. When the folding base folds due to an external impact, the clutch grooves move upwards along the clutch protrusions and disengage, allowing the entire folding base to rotate and dissipate force. The lifting spring pushes the lower wear-resistant ring against the lower surface of the folding base.

2. The rearview mirror easy-locking and low-resistance folding mechanism according to claim 1, characterized in that: The base has a plurality of fixing holes spaced apart along its circumferential direction on the side facing the clutch base; the clutch base has fixing posts spaced apart along its circumferential direction on the side facing the base; the fixing posts are inserted into the fixing holes and fixedly connected by screws.

3. The rearview mirror easy-locking and low-resistance folding mechanism according to claim 1, characterized in that: The motor output shaft is provided with a driving worm; the folding base is also provided with a driven worm that meshes with a gear ring, and the driven worm is provided with a worm wheel that is adapted to the driving worm.

4. The rearview mirror easy-locking and low-resistance folding mechanism according to claim 1, characterized in that: The lifting spring is a butterfly spring, with its inner coil higher than its outer coil; the outer coil of the butterfly spring abuts against the upper surface of the clutch base, and the inner coil abuts against the lower surface of the lower wear-resistant ring; the locking block passes through the elastic groove of the outer coil of the butterfly spring and provides circumferential freedom constraint for the butterfly spring.

5. The rearview mirror easy-locking and low-resistance folding mechanism according to claim 1, characterized in that: The unlocking groove is fan-shaped along the circumferential direction of the gear ring, and guide slopes are provided at both ends of the fan-shaped direction; the unlocking block is fan-shaped along the circumferential direction of the dial ring, and guide slopes are provided at both ends of the fan-shaped direction.

6. The rearview mirror easy-locking and low-resistance folding mechanism according to claim 1, characterized in that: The lower surface of the dial ring is provided with a fan-shaped anti-bend block protruding downwards along its circumferential direction. The anti-bend block has an anti-bend upper inclined surface on one side corresponding to the unfolding direction of the folding base. The upper surface of the folding base is provided with an anti-bend groove protruding downwards in a fan shape along its circumferential direction. The anti-bend groove has an anti-bend lower inclined surface on one side corresponding to the unfolding direction of the folding base. When the folding base is folded, the anti-bend block slides in a fan shape within the anti-bend groove. There are multiple sets of anti-bend blocks and anti-bend grooves, which are evenly distributed along the circumferential direction of the dial ring.

7. The rearview mirror easy-clutch low-resistance folding mechanism according to claim 1, characterized in that: The outer wall of the base is provided with a first positioning element that is spaced apart along the circumferential direction of the folding base; the folding base is provided with a second positioning element that is adapted to the first positioning element and limits its rotation angle range.

8. The rearview mirror easy-locking and low-resistance folding mechanism according to claim 1, characterized in that: Both ends of the clutch groove and the clutch protrusion in the circumferential direction are provided with clutch inclined surfaces.

9. A rearview mirror easy-locking and low-resistance folding mechanism according to claim 6, characterized in that: When the folding base is unfolded, the unlocking block abuts against the lower surface of the gear ring, and the dial ring presses down on the folding base to bring it close to / fit against the clutch base. At this time, the lower wear-resistant ring moves downward and compresses the lifting spring; and the locking block is embedded in the locking groove to constrain the circumferential degree of freedom between the two. S1. When the motor is powered on, the folding begins. The gear ring is under stress and rotates clockwise relative to the clutch base. The paddle moves clockwise and pushes the lifting slider to rotate the dial ring clockwise. At this time, the lifting slope contacts the supporting slope. At the same time, the unlocking block begins to unlock in accordance with the unlocking slot, providing upward space for the dial ring to be inserted into the subsequent upward movement. S2. As the gear ring rotates clockwise relative to the clutch base, the lifting slider moves upward along the lifting slope under the push of the paddle, and the paddle ring moves upward and fits with the gear ring, causing the unlocking block to enter the unlocking groove; at this time, the lifting spring pushes the folding base upward through the lower wear-resistant ring, causing the folding base to separate from the clutch base and creating an upward gap to reduce friction. At the same time, the locking block disengages from the locking groove to unlock the circumferential degree of freedom between the folding base and the clutch base. S3. As the gear ring rotates clockwise relative to the clutch base, the paddle, unlocking block, and lifting groove form a rigid contact. At this time, the folding base begins to rotate counterclockwise under the drive of the reverse force until it is folded in place. S4. When the folded position is in place, the top of the locking block and the bottom of the folding base are supported against each other, so that the lifting gap between the folding base and the clutch base is always maintained.

10. A rearview mirror easy-locking and low-resistance folding mechanism according to claim 9, characterized in that: When the motor is powered on and the folding base begins to unfold in its folded state, the folding base rotates clockwise under the reverse force of the gear ring. When the folding base is fully unfolded, the locking block realigns with the locking groove to leave axial space for the folding base to fall. At this time, the end face of the anti-folding groove abuts against the end face of the anti-folding block, forcing the folding base to drive the dial ring to generate a clockwise rotation torque. Meanwhile, the gear ring generates a counterclockwise torque under the drive of the motor, and its lifting slider is constrained by the other side of the lifting groove. At this time, the gear ring is moving counterclockwise, and the dial ring is moving clockwise. The resulting circumferential angle difference causes the unlocking block to slide out of the unlocking groove, thereby pushing the dial ring downward and pushing the folding base to fall so that the locking block engages with the locking groove for positioning. At this time, the unfolding is completed and the positioning state is entered.

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