Limiting element, adjusting device, outside rear-view mirror assembly and vehicle

Abstract

The utility model relates to a limiting ring, an adjusting device, an outside rear-view mirror assembly and a vehicle. The limiting ring, the adjusting device, the outside rear-view mirror assembly and the vehicle comprise the limiting ring, an elastic unit and a limiting unit. The limiting unit is connected to the limiting ring through the elastic unit; in the radial direction of the limiting ring, the elastic unit can generate elastic deformation so as to drive the limiting unit to move in the radial direction of the limiting ring, and the limiting unit can pass through a check block on the corner limiting structure. When the limiting unit passes through the check block, the check block applies pressure in the radial direction of the limiting ring to the limiting unit, so that the limiting unit gets close in the radial direction of the limiting ring, the limiting ring is prevented from colliding with the bottom wall of the shell after the limiting unit passes through the check block, and noise is avoided or reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile accessories and relates to a limiting element, an adjusting device, an exterior rearview mirror assembly and a vehicle. Background Art

[0002] The exterior rearview mirror assembly mainly includes an adjustment device and an exterior rearview mirror. The adjustment device is used to adjust the angle of the exterior rearview mirror. Related technology CN 202180038180.0, the adjustment device includes a base, a shell and a limiting element, wherein the shell can rotate relative to the base around the axis of the limiting element. During the rotation of the shell relative to the base, the shell will also rotate relative to the limiting element. A block is provided on the shell, and the limiting element includes a limiting ring and a card. Through the cooperation of the block and the card, the relative rotation of the shell and the limiting ring can be achieved. When the shell rotates, the card will generate noise after passing through the block. Utility Model Content

[0003] Aiming at the problem that noise is generated when the housing of a position adjustment device of an exterior rearview mirror assembly rotates in the related art, a limiting element, an adjustment device, an exterior rearview mirror assembly and a vehicle are provided.

[0004] In order to solve the above technical problems, on the one hand, an embodiment of the present utility model provides a limiting element, including a limiting ring, an elastic unit and a limiting unit; the limiting unit is connected to the limiting ring through the elastic unit; the elastic unit can produce elastic deformation along the radial direction of the limiting ring to drive the limiting unit to move in the radial direction of the limiting ring.

[0005] Optionally, the limiting unit protrudes from the outer side surface of the limiting ring along the radial direction of the limiting ring.

[0006] Optionally, there are multiple elastic units, and each elastic unit is arranged around the axis of the limiting ring; and each elastic unit is connected to the limiting unit.

[0007] Optionally, the elastic units are evenly arranged around the axis of the limiting ring; and / or the limiting units are evenly arranged around the axis of the limiting ring.

[0008] Optionally, the elastic unit is connected to the outer side surface of the limiting ring, and the limiting unit is connected to the surface of the elastic unit facing away from the limiting ring.

[0009] Optionally, the elastic unit and the limiting ring enclose a contraction space, and the elastic unit can be elastically deformed toward the contraction space.

[0010] Optionally, in the circumferential direction of the limiting ring, the elastic unit includes a first connection part, a second connection part and a third connection part connected in sequence; in the circumferential direction of the limiting ring, one end of the first connection part facing away from the second connection part and one end of the third connection part facing away from the second connection part are both connected to the limiting ring; the second connection part is spaced apart from the limiting ring, and the first connection part, the second connection part, the third connection part and the limiting ring together form the shrinkage space; the limiting unit is connected to the surface of the second connection part facing away from the limiting ring; at least one of the first connection part, the second connection part and the third connection part can produce elastic deformation in the radial direction of the limiting ring.

[0011] Optionally, the limiting ring, the elastic unit and the limiting unit are integrally formed.

[0012] Optionally, the limiting unit has a blocking surface and a guiding surface; along the circumferential direction of the limiting ring and along the direction from the blocking surface to the guiding surface, the guiding surface gradually approaches the limiting ring.

[0013] Optionally, the limiting element further includes a blocking unit, which is connected to the limiting ring; along the circumferential direction of the limiting ring, the blocking unit includes a first protrusion and a second protrusion arranged at intervals; in the axial direction of the limiting ring, the first protrusion and the second protrusion protrude from the limiting ring in the same direction.

[0014] Optionally, there are multiple blocking units, and each blocking unit is arranged on the same end surface of the limiting ring around the axis of the limiting ring.

[0015] In order to solve the above technical problems, on the other hand, an embodiment of the present utility model provides an adjusting device, comprising a base, a shell and a limiting element as described above; the shell is connected to the base and can rotate relative to the base around the axis of the limiting element; an angle limiting structure is provided on the shell; when the shell rotates relative to the base around the axis of the limiting element, the limiting element and the base are relatively stationary; the angle limiting structure cooperates with the limiting element to limit the rotation angle of the shell relative to the base.

[0016] Optionally, the limiting unit has a resisting surface and a guiding surface; when the limiting element rotates around its own axis and along the direction from the guiding surface to the resisting surface, the resisting surface can resist the angle limiting structure to prevent the limiting element from rotating in the positive direction relative to the angle limiting structure; when the limiting element rotates around its own axis and along the direction from the resisting surface to the guiding surface, the guiding surface can resist the angle limiting structure, so that the limiting unit is subjected to a radial force along the limiting element, thereby causing the elastic unit to deform elastically, so that the limiting unit can pass through the angle limiting structure.

[0017] Optionally, the limiting element is arranged in the shell; in the radial direction of the limiting element ring, the limiting unit is spaced apart from the inner side wall of the shell.

[0018] Optionally, the corner limiting structure is a stopper provided on the inner side wall of the shell.

[0019] Optionally, the adjusting device further includes a driving element; the driving element is used to drive the housing so that the housing can rotate relative to the base around the axis of the limiting element.

[0020] Optionally, the driving element includes a driving unit and a rotating unit, and the driving unit and the rotating unit are both arranged in the shell; the driving unit is connected to the shell, and is used to drive the rotating unit to rotate around its own axis, and the rotating unit is coaxial with the shell and the limiting element; a first retaining structure is provided on the rotating unit, and a second retaining structure is provided on the base, and the first retaining structure and the second retaining structure cooperate with each other to limit the rotation angle of the rotating unit relative to the base.

[0021] Optionally, the adjusting device also includes a connecting shaft and an elastic member; a first limiting structure and a second limiting structure are provided on the connecting shaft; the first limiting structure and the elastic member are located inside the outer shell, and the second limiting structure is located outside the outer shell; the elastic member is compressed between the first limiting structure and the rotating unit; the elastic member presses the rotating unit onto the base, and presses the limiting element onto the outer shell through the rotating unit; the second limiting structure interferes with one end of the base facing away from the rotating unit.

[0022] Optionally, the limiting element includes a resisting unit; when the housing rotates relative to the base around the axis of the limiting element, the first resisting structure can simultaneously resist the second resisting structure and the resisting unit, so that the limiting element and the base are relatively stationary.

[0023] Optionally, the base includes a support shaft and a support flange; a first through hole is provided on the shell along the axial direction of the limiting element; the support shaft extends into the shell through the first through hole, and the support flange is arranged on the side wall of the support shaft, and the support flange is located outside the shell and can contact the shell in the axial direction of the limiting element; the elastic member presses the rotating unit against the end of the support shaft extending into the shell; the second limiting structure contacts the end of the support shaft away from the rotating unit.

[0024] Optionally, the supporting shaft, the limiting element and the rotating unit are sleeved on the connecting shaft; and the limiting element is sleeved on the supporting shaft.

[0025] Optionally, in the axial direction of the limiting element, the outer shell includes a first shell and a second shell, and the first shell and the second shell are connected and enclosed to form an installation space; the second shell is located on the side of the first shell away from the support flange; the limiting element, the driving unit, the rotating unit and the elastic member are all arranged in the installation space; the first through hole is arranged on the first shell; a fourth through hole is provided on the second shell, and a fifth through hole opposite to the fourth through hole is provided on the connecting shaft; in the axial direction of the limiting element, the fourth through hole passes through the second shell, and the fifth through hole passes through the connecting shaft.

[0026] Optionally, the base is provided with a first through-hole and the shell is provided with a second through-hole; along the axial direction of the limiting element, the first through-hole completely penetrates the base; along the axial direction of the limiting element, the second through-hole completely penetrates the shell; in the axial direction of the limiting element, the first through-hole and the second through-hole are opposite to each other to form a wire-passing hole.

[0027] In order to solve the above technical problems, on the other hand, an embodiment of the present invention provides an exterior rearview mirror assembly, comprising an exterior rearview mirror and an adjustment device as described above, wherein the exterior rearview mirror is connected to a housing of the adjustment device.

[0028] In order to solve the above technical problems, on the other hand, an embodiment of the present invention provides a vehicle, including the exterior rearview mirror assembly as described above, or including the adjustment device described in any one of the above items.

[0029] In the limiting element, adjusting device and vehicle provided by the embodiments of the present invention, when the limiting unit passes through the block, the block applies pressure along the radial direction of the limiting element to the limiting unit, so that the limiting unit approaches along the radial direction of the limiting element, and then after the limiting unit passes through the block, the limiting element can be prevented from colliding with the bottom wall of the shell, thereby avoiding noise or reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a cross-sectional view of an adjustment device provided by one embodiment of the present utility model;

[0031] Figure 2 This is an exploded view of an adjustment device provided by an embodiment of the present utility model;

[0032] Figure 3 This is a schematic structural diagram of a limiting element of an adjusting device provided by an embodiment of the present utility model;

[0033] Figure 4 This is a schematic diagram of the structure of the base of the adjustment device provided by an embodiment of the utility model Figure 1 ;

[0034] Figure 5 This is a schematic diagram of the structure of the base of the adjustment device provided by an embodiment of the utility model Figure 2 ;

[0035] Figure 6 This is a structural diagram of a rotating unit of an adjusting device provided by an embodiment of the present utility model;

[0036] Figure 7 This is a schematic structural diagram of a connecting shaft of an adjusting device provided in one embodiment of the present utility model;

[0037] Figure 8 This is a schematic diagram of the structure of the second housing of the adjustment device provided in one embodiment of the present invention. Figure 1 ;

[0038] Figure 9 This is a schematic diagram of the structure of the second housing of the adjustment device provided in one embodiment of the present invention. Figure 2 .

[0039] The reference numerals in the specification are as follows:

[0040] 100. Adjustment device;

[0041] 1. Base; 11. Second retaining structure; 111. First boss; 112. Second boss; 113. First inclined surface; 114. Second inclined surface; 115. First supporting surface; 116. Third inclined surface; 117. Second supporting surface; 118. Third supporting surface; 119. Fourth supporting surface; 12. Support seat; 13. Support unit; 131. Fifth supporting surface; 14. Support shaft; 141. Second through hole; 142. First avoidance groove; 143. Second avoidance groove; 15. Support flange; 151. Recessed structure;

[0042] 2. Housing; 21. First through hole; 22. First shell; 221. Outer convex structure; 23. Second shell; 231. Fourth through hole;

[0043] 3. Driving element; 31. Driving unit; 311. Motor; 312. First worm; 313. Second worm; 314. Second gear; 32. Rotating unit; 321. First resisting structure; 322. Force-bearing unit; 323. First resisting surface; 324. Second resisting surface; 325. Third resisting surface; 326. Third through hole;

[0044] 4. Limiting element; 41. Limiting ring; 42. Elastic unit; 421. First connecting portion; 422. Second connecting portion; 423. Third connecting portion; 43. Limiting unit; 431. Stopping surface; 432. Guide surface; 44. Contraction space; 45. Stopping unit; 451. First protrusion; 452. Second protrusion; 453. First limiting surface; 454. Second limiting surface; 455. Third limiting surface; 456. Fourth limiting surface; 457. Fifth limiting surface;

[0045] 5. Angle limiting structure; 51. Stopper;

[0046] 6. Connecting shaft; 61. First limiting structure; 62. Second limiting structure; 63. Fifth through hole;

[0047] 7. Elastic parts. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] like Figures 1 to 3 As shown, in one embodiment, the adjustment device 100 includes a base 1, a housing 2, a driving element 3, and a limiting element 4. The limiting element 4 includes a limiting ring 41, an elastic unit 42, and a limiting unit 43. The limiting unit 43 is connected to the limiting ring 41 via the elastic unit 42. The elastic unit 42 can generate elastic deformation along the radial direction of the limiting ring 41 to drive the limiting unit 43 to move in the radial direction of the limiting ring 41.

[0050] The housing 2 is connected to the base 1 and can rotate relative to the base 1 about the axis of the retaining ring 41. The driving element 3 is used to drive the housing 2, allowing the housing 2 to rotate relative to the base 1 about the axis of the retaining ring 41. The housing 2 is provided with a rotation angle limiting structure 5. When the housing 2 rotates relative to the base 1 about the axis of the retaining ring 41, the retaining element 4 can remain stationary relative to the base 1.

[0051] When the base 1 is stationary and the housing 2 rotates relative to the base 1 around the axis of the limiting ring 41 , the limiting element 4 can remain stationary with the base 1 . At this time, the housing 2 also rotates relative to the limiting element 4 around the axis of the limiting ring 41 .

[0052] The limiting element 4 is used to cooperate with the rotation angle limiting structure 5 to limit the rotation angle of the housing 2 relative to the base 1.

[0053] Among them, when the shell 2 rotates in the positive direction around the axis of the limiting ring 41 relative to the base 1 (that is, the base 1 rotates in the negative direction around the axis of the limiting ring 41 relative to the shell 2), the limiting unit 43 of the limiting element 4 can pass through the angle limiting structure 5. At this time, the limiting element 4 will not block the relative rotation between the shell 2 and the base 1; when the shell 2 rotates in the negative direction around the axis of the limiting ring 41 relative to the base 1 (that is, the base 1 rotates in the positive direction around the axis of the limiting ring 41 relative to the shell 2), the limiting unit 43 of the limiting element 4 can cooperate with the angle limiting structure 5 to limit the relative rotation angle of the shell 2 and the base 1.

[0054] Specifically, during the positive rotation of the housing 2 around the axis of the limiting ring 41, when the limiting unit 43 rotates to contact the angle limiting structure 5, the angle limiting structure 5 will apply a force toward the limiting ring 41 along the radial direction of the limiting ring 41 to the limiting unit 43, so that the elastic unit 42 can shrink along the radial direction of the limiting ring 41. At this time, the limiting unit 43 will also approach the limiting ring 41 along the radial direction of the limiting ring 41, so that the limiting unit 43 can pass through the angle limiting structure 5, so that the limiting unit 43 and the angle limiting structure 5 will not hinder the positive rotation of the housing 2; and the housing 2 rotates around the axis of the limiting ring 41. During the reverse rotation process, after rotating to a certain angle, the limiting unit 43 cooperates with the angle limiting structure 5. At this time, although the angle limiting structure 5 is in contact with the limiting unit 43, the angle limiting structure 5 cannot apply a force toward the limiting ring 41 along the radial direction of the limiting ring 41 to the limiting unit 43. At this time, the limiting unit 43 cannot rely on the pressure of the angle limiting structure 5 to approach the limiting ring 41, so that the limiting unit 43 cannot pass through the angle limiting structure 5. At this time, the shell 2 can be prevented from continuing to rotate relative to the base 1 around the axis of the limiting ring 41, thereby achieving the limitation of the rotation angle of the shell 2 relative to the base 1.

[0055] The housing 2 is coaxial with the limiting ring 41 , and the axis of the housing 2 is the axis of the limiting ring 41 . In addition, the axis of the limiting element 4 is the axis of the limiting ring 41 , and the radial direction of the limiting element 4 is the radial direction of the limiting ring 41 .

[0056] In one application scenario, the adjustment device 100 can be used in a vehicle, with the base 1 connected to the vehicle body and the housing 2 connected to the external vision unit. This allows the adjustment device 100 to limit the rotation angle of the external vision unit relative to the vehicle body around the axis of the housing 2. During operation, the base 1 remains stationary relative to the vehicle body, while a force can be applied to the housing 2 to rotate the housing 2 relative to the base 1, thereby enabling the external vision unit connected to the housing 2 to rotate relative to the vehicle body.

[0057] The external visual unit may be an exterior rearview mirror of the vehicle, and the axis of the housing 2 may be parallel to the height direction of the vehicle, that is, the axis of the housing 2 may be parallel to the vertical direction.

[0058] During use, the limiting element 4 and the rotation angle limiting structure 5 can achieve one-way limiting of the rotation of the housing 2 relative to the base 1, that is, only when the housing 2 rotates in the opposite direction around its own axis can the maximum rotation angle of the housing 2 be limited by the cooperation of the limiting element 4 and the rotation angle limiting structure 5. In order to limit the maximum rotation angle of the housing 2 when it rotates in the forward direction around its own axis, the housing 2 can be limited by parts outside the adjusting device 100. For example, the external element can be a limiting block installed on the vehicle body. Among them, when the housing 2 is limited by the external element, the external element can directly contact the housing 2, or the external element can also contact a corresponding component connected to the housing 2. In this case, the external element is in indirect contact with the housing 2.

[0059] It should be understood that in other application scenarios, the housing 2 may remain stationary, and the base 1 may be driven to rotate relative to the housing 2 .

[0060] In the related art, when a card passes through a block, it is subjected to the upward pressure of the block, causing the card to bend upward. After the card passes through the block, the card moves downward to reset. At this time, the card is likely to hit the bottom wall of the shell, thereby generating noise.

[0061] Moreover, in the related art, the limit ring will contact the bottom wall of the shell. When the card passes through the block, the upward pressure exerted by the block on the card will easily cause the limit ring to be lifted (that is, it moves a certain distance away from the bottom wall along the axial direction of the limit ring), thereby making the limit ring and the bottom wall of the shell separated by a certain distance. After the card passes through the block, the limit ring will hit the bottom wall of the shell when it moves downward, which will also generate noise.

[0062] In this embodiment, the combination of the elastic unit 42 and the limiting unit 43 is equivalent to a card in the related art. The provision of the elastic unit 42 enables the limiting unit 43 to approach or move away from the limiting ring 41 along the radial direction of the limiting ring 41. In this embodiment, when the limiting unit 43 passes through the corner limiting structure 5, the stopper 51 applies pressure along the radial direction of the limiting ring 41 to the limiting unit 43, causing the limiting unit 43 to approach the limiting ring 41 along the radial direction of the limiting ring 41. This can effectively prevent the limiting ring 41 from moving a certain distance away from the bottom wall of the housing 2 along its own axis due to the force applied by the corner limiting structure 5 (i.e., it can effectively prevent the limiting ring 41 from being lifted by the stopper 51). Furthermore, after the limiting unit 43 passes through the corner limiting structure 5, the limiting ring 41 can be prevented from colliding with the bottom wall of the housing 2, thereby avoiding or reducing noise.

[0063] like Figure 3 As shown, in one embodiment, along the radial direction of the limiting ring 41 , the limiting unit 43 protrudes from the outer side surface of the limiting ring 41 . This arrangement facilitates the cooperation between the limiting unit 43 and the rotation angle limiting structure 5 .

[0064] like Figure 3 As shown, in one embodiment, multiple elastic units 42 and multiple limiting units 43 are provided; each elastic unit 42 is spaced apart around the axis of the limiting ring 41; each elastic unit 42 corresponds to each limiting unit 43; and each limiting unit 43 is connected to its corresponding elastic unit 42. After assembly, each limiting unit 43 is also spaced apart around the axis of the limiting ring 41. "Multiple" means greater than or equal to two. The term "multiple" has the same meaning in all embodiments and will not be further explained below.

[0065] Preferably, the elastic units 42 are evenly arranged around the axis of the limiting ring 41 , and the limiting units 43 are also evenly arranged around the axis of the limiting ring 41 .

[0066] exist Figure 3 In the example shown, three elastic units 42 and three limiting units 43 are provided.

[0067] like Figure 3 As shown, in one embodiment, the elastic unit 42 is connected to the outer side surface of the limiting ring 41, and the limiting unit 43 is connected to the surface of the elastic unit 42 facing away from the limiting ring 41. This can make the structure of the limiting element 4 simpler and facilitate the production and preparation of the limiting element 4.

[0068] like Figure 3 As shown, in one embodiment, the elastic unit 42 and the limiting ring 41 enclose a contraction space 44 , and the elastic unit 42 can elastically deform toward the contraction space 44 .

[0069] Specifically, such as Figure 3As shown, in one embodiment, in the circumferential direction of the limiting ring 41, the elastic unit 42 includes a first connection part 421, a second connection part 422 and a third connection part 423 connected in sequence; in the circumferential direction of the limiting ring 41, the first connection part 421 and the third connection part 423 are arranged at intervals, and the end of the first connection part 421 away from the second connection part 422 and the end of the third connection part 423 away from the second connection part 422 are both connected to the limiting ring 41; the second connection part 422 is arranged at intervals from the limiting ring 41, and the first connection part 421, the second connection part 422, the third connection part 423 and the limiting ring 41 enclose a contraction space 44, and at this time, the contraction space 44 is a closed-loop space.

[0070] In addition, in the radial direction of the limiting ring 41, the limiting unit 43 is connected to the surface of the second connecting part 422 facing away from the limiting ring 41, and at least one of the first connecting part 421, the second connecting part 422 and the third connecting part 423 can produce elastic deformation in the radial direction of the limiting ring 41, thereby enabling the limiting unit 43 to approach or move away from the limiting ring 41 along the radial direction of the limiting ring 41.

[0071] Preferably, the first connecting portion 421, the second connecting portion 422, and the third connecting portion 423 all have a certain degree of elasticity, so that all three can produce elastic deformation in the radial direction of the limiting ring 41. In this case, the first connecting portion 421 can be any elastic plastic material such as allyl plastic, polyurethane plastic, etc., the second connecting portion 422 can be any elastic plastic material such as allyl plastic, polyurethane plastic, etc., and the third connecting portion 423 can be any elastic plastic material such as allyl plastic, polyurethane plastic, etc. Of course, in other embodiments, the material of any one of the first connecting portion 421, the second connecting portion 422, and the third connecting portion 423 can also be metal, such as steel, iron, etc.

[0072] In addition, the materials of the first connection portion 421 , the second connection portion 422 and the third connection portion 423 may be the same, or the materials of any two of the three may be different.

[0073] The first connection portion 421 , the second connection portion 422 and the third connection portion 423 may all be strip-shaped structures, wherein a surface of the second connection portion 422 close to the limiting ring 41 and an outer side surface of the limiting ring 41 may be parallel to each other.

[0074] In the axial direction of the limiting ring 41, the thickness of the first connecting part 421, the second connecting part 422 and the third connecting part 423 can be the same, and, in the axial direction of the limiting ring 41, the first end face of the first connecting part 421, the first end face of the second connecting part 422 and the first end face of the third connecting part 423 can be flush, and the second end face of the first connecting part 421, the second end face of the second connecting part 422 and the second end face of the third connecting part 423 can be flush.

[0075] In the axial direction of the limiting ring 41, the distance between the first end face of the first connecting part 421 and the second end face of the first connecting part 421 is the thickness of the first connecting part 421, the distance between the first end face of the second connecting part 422 and the second end face of the second connecting part 422 is the thickness of the second connecting part 422, and the distance between the first end face of the third connecting part 423 and the second end face of the third connecting part 423 is the thickness of the third connecting part 423.

[0076] In the axial direction of the limiting ring 41 , the thickness of any one of the first connecting portion 421 , the second connecting portion 422 and the third connecting portion 423 may be the same as or different from the thickness of the limiting ring 41 .

[0077] In other embodiments, under the premise of satisfying structural strength, the contraction space 44 may also be an open-loop space. In this case, the first connection portion 421 may not be provided, or the third connection portion 423 may not be provided.

[0078] In the radial direction of the limiting ring 41, the minimum distance between each region of the limiting unit 43 and the axis of the limiting ring 41 can be greater than or equal to the maximum distance between each region of the elastic unit 42 and the axis of the limiting ring 41. This facilitates contact and cooperation between the limiting unit 43 and the rotation angle limiting structure 5 and effectively prevents contact and interference between the elastic unit 42 and the rotation angle limiting structure 5.

[0079] In one embodiment, the limiting ring 41, the elastic unit 42 and the limiting unit 43 are integrally formed, which makes it easier to produce the limiting element 4. For example, the three can be integrally formed by injection molding.

[0080] In one embodiment, the limiting unit 43 is a block-shaped structure. When it is arranged on the second connecting portion 422, the thickness of the limiting unit 43 in the axial direction of the limiting ring 41 can be equal to the thickness of the second connecting portion 422. Of course, while ensuring the strength, the thickness of the limiting unit 43 in the axial direction of the limiting ring 41 can be greater than or less than the thickness of the second connecting portion 422.

[0081] When the thickness of the limiting unit 43 in the axial direction of the limiting ring 41 is equal to the thickness of the second connecting portion 422, the first end surface of the limiting unit 43 is flush with the first end surface of the second connecting portion 422, and the second end surface of the limiting unit 43 is flush with the second end surface of the second connecting portion 422. In the axial direction of the limiting ring 41, the distance between the first end surface of the limiting unit 43 and the second end surface of the limiting unit 43 is equal to the thickness of the limiting ring 41.

[0082] like Figure 3 As shown, in one embodiment, the limiting unit 43 has a resisting surface 431 and a guiding surface 432 ; along the circumferential direction of the limiting ring 41 and along the direction from the resisting surface 431 to the guiding surface 432 , the guiding surface 432 gradually approaches the limiting ring 41 .

[0083] When the limiting element 4 rotates around its own axis and along the direction from the guide surface 432 to the resisting surface 431, the resisting surface 431 can contact the angle limiting structure 5 to prevent the limiting element 4 from rotating in the positive direction, thereby preventing the limiting element 4 from rotating in the positive direction relative to the angle limiting structure 5; when the limiting element 4 rotates around its own axis and along the direction from the resisting surface 431 to the guide surface 432, the guide surface 432 can rotate the angle limiting structure 5, so that the limiting unit 43 is subjected to a radial force along the limiting ring 41, thereby causing the elastic unit 42 to elastically deform, so that the limiting unit 43 can pass through the angle limiting structure 5.

[0084] The guide surface 432 can be an arcuate surface, a flat surface, or a partially flat surface and an arcuate surface. Furthermore, the guide surface 432 can be parallel to the axis of the retaining ring 41. When the rotational angle limiting structure 5 contacts the abutting surface 431, the surface of the rotational angle limiting structure 5 that contacts the abutting surface 431 is parallel to the abutting surface 431.

[0085] In the circumferential direction of the limiting ring 41, the first end of the guide surface 432 may be in contact with the elastic unit 42. For example, the first end of the guide surface 432 may be in contact with the surface of the second connecting portion 422 facing away from the limiting ring 41, and the second end of the guide surface 432 may be in contact with the abutment surface 431. Furthermore, in the radial direction of the limiting ring 41, the second end of the guide surface 432 of a limiting unit 43 may be the area of the limiting unit 43 farthest from the axis of the limiting ring 41.

[0086] In a feasible embodiment, the limiting unit 43 is a right-angled triangular prism. In addition to having two parallel end faces, the right-angled triangular prism also has a first side face, a second side face, and a third side face connected in sequence in the circumferential direction, wherein the first side face is perpendicular to the second side face, the third side face intersects with the first side face and the second side face respectively, the first side face coincides with the surface of the second connecting portion 422 facing away from the limiting ring 41, the second side face is a blocking surface 431, and the third side face is a guiding surface 432.

[0087] like Figure 3 As shown, in one embodiment, the limiting element 4 also includes a blocking unit 45, which is connected to the limiting ring 41; along the circumferential direction of the limiting ring 41, the blocking unit 45 includes a first protrusion 451 and a second protrusion 452 arranged at intervals; in the axial direction of the limiting ring 41, the first protrusion 451 and the second protrusion 452 protrude from the limiting ring 41 in the same direction.

[0088] The first protrusion 451 and the second protrusion 452 protrude from the limit ring 41 in the same direction, which means that: in the axial direction of the limit ring 41, along the direction from the first end face of the limit ring 41 to the second end face of the limit ring 41, the first protrusion 451 and the second protrusion 452 both protrude from the second end face of the limit ring 41; or, in the axial direction of the limit ring 41, along the direction from the second end face of the limit ring 41 to the first end face of the limit ring 41, the first protrusion 451 and the second protrusion 452 both protrude from the first end face of the limit ring 41.

[0089] The first protrusion 451 and the second protrusion 452 are used to limit the position of the first blocking structure 321 of the rotating unit 32 , and details will be described below.

[0090] The blocking unit 45 may be arranged on the end face of the limiting ring 41 , specifically: the first protrusion 451 and the second protrusion 452 are both arranged on the first end face of the limiting ring 41 ; or, the first protrusion 451 and the second protrusion 452 are both arranged on the second end face of the limiting ring 41 .

[0091] like Figure 3 As shown, in one embodiment, a plurality of retaining units 45 are provided, and each retaining unit 45 is arranged on the same end surface of the retaining ring 41 around the axis of the retaining ring 41, which makes it easier to assemble the folder. Specifically, each retaining unit 45 is arranged on the first end surface of the retaining ring 41, or each retaining unit 45 is arranged on the second end surface of the retaining ring 41. Preferably, each retaining unit 45 is evenly arranged on the same end surface of the retaining ring 41 around the axis of the retaining ring 41.

[0092] like Figure 3As shown, in one embodiment, in the circumferential direction of the limiting ring 41, the surface of the first protrusion 451 close to the second protrusion 452 includes a first limiting surface 453, and the surface of the second protrusion 452 close to the first protrusion 451 includes a second limiting surface 454, a third limiting surface 455, and a fourth limiting surface 456. The first limiting surface 453, the second limiting surface 454, and the fourth limiting surface 456 are all inclined surfaces. Along the direction from the limiting ring 41 to the blocking unit 45, the first limiting surface 453 gradually moves away from the second protrusion 452, and the second limiting surface 454 and the fourth limiting surface 456 gradually move away from the second protrusion 452. The third limiting surface 455 is a plane that is perpendicular to the axis of the limiting ring 41.

[0093] In the circumferential direction of the limiting ring 41, the first limiting surface 453 and the second limiting surface 454 are spaced apart, and the end surface of the limiting ring 41 is located between the first limiting surface 453 and the second limiting surface 454 as the fifth limiting surface 457. Figure 6 ) moves between the first limiting surface 453 and the second limiting surface 454, the first retaining structure 321 can contact the fifth limiting surface 457, so that the first retaining structure 321 is supported by the fifth limiting surface 457. In addition, in the circumferential direction of the limiting ring 41, the second limiting surface 454 and the fourth limiting surface 456 are spaced apart. When the first retaining structure 321 moves between the second limiting surface 454 and the fourth limiting surface 456, the first retaining structure 321 can contact the third limiting surface 455, so that the first retaining structure 321 is supported by the third limiting surface 455.

[0094] like Figure 3 As shown, in one embodiment, in the axial direction of the limiting ring 41, one end of the first limiting surface 453 intersects with the end face of the limiting ring 41, the other end of the first limiting surface 453 intersects with the end face of the first protrusion 451 facing away from the limiting ring 41 (this end face is defined as end face a), one end of the second limiting surface 454 intersects with the end face of the limiting ring 41, the other end of the second limiting surface 454 intersects with one end of the third limiting surface 455, one end of the fourth limiting surface 456 intersects with the other end of the third limiting surface 455, and the other end of the fourth limiting surface 456 intersects with the end face of the second protrusion 452 facing away from the limiting ring 41 (this end face is defined as end face b).

[0095] In the axial direction of the limiting ring 41, the end surface a may be the surface of the first protrusion 451 farthest from the limiting ring 41, and the end surface b may be the surface of the second protrusion 452 farthest from the limiting ring 41. In the axial direction of the limiting ring 41, the end surface a and the end surface b may be flush.

[0096] In one embodiment, the base 1 is provided with a first through-hole, and the housing 2 is provided with a second through-hole. Along the axial direction of the retaining ring 41, the first through-hole completely penetrates the base 1; along the axial direction of the retaining ring 41, the second through-hole completely penetrates the housing 2. Along the axial direction of the retaining ring 41, the first through-hole and the second through-hole are opposed to each other, forming a wire hole. During use, a conductive wire, etc., can pass through the adjusting device 100 through the wire hole. The first through-hole and the second through-hole being opposed to each other means that, in an orthographic projection on a plane perpendicular to the axis of the retaining ring 41, the projections of the first through-hole and the second through-hole at least partially overlap.

[0097] like Figure 1 and Figure 2 As shown, in one embodiment, the limiting element 4 is disposed within the housing 2, and in the radial direction of the limiting ring 41, the limiting unit 43 is spaced apart from the inner sidewall of the housing 2, that is, the limiting unit 43 is spaced apart from the inner surface of the sidewall of the housing 2. This prevents the limiting unit 43 from colliding with the sidewall of the housing 2 after passing through the stopper 51, thereby further reducing noise.

[0098] In addition, the limiting element 4 and the housing 2 may be coaxially arranged.

[0099] In one embodiment, the rotation angle limiting structure 5 is a stopper 51 provided on the inner side wall of the housing 2 , that is, the stopper 51 is provided on the inner surface of the side wall of the housing 2 .

[0100] Among them, the structure of the stop block 51 can be the same as the structure of the limiting unit 43. For example, the stop block 51 is also a right-angled triangular prism. In addition to having two parallel end faces, it also has a fourth side surface, a fifth side surface and a sixth side surface connected in sequence in its circumferential direction, wherein the fourth side surface is perpendicular to the fifth side surface, the sixth side surface intersects with the fourth side surface and the fifth side surface respectively, the fourth side surface coincides with the inner surface of the side wall of the outer shell 2, the fifth side surface is used to contact the abutment surface 431 of the limiting unit 43, and the sixth side surface is used to guide the limiting unit 43 to pass through the stop block 51.

[0101] In addition, the stopper 51 may be spaced a certain distance from the inner surface of the bottom wall of the housing 2 .

[0102] like Figure 1 and Figure 2 as well as Figure 4 and Figure 6As shown, in one embodiment, the driving element 3 includes a driving unit 31 and a rotating unit 32, and the driving unit 31 and the rotating unit 32 are both arranged in the shell 2; the driving unit 31 is connected to the shell 2, and is used to drive the rotating unit 32, so that the rotating unit 32 can rotate around its own axis, and the rotating unit 32 is coaxial with the shell 2 and the limiting element 4; a first retaining structure 321 is provided on the rotating unit 32, and a second retaining structure 11 is provided on the base 1, and the first retaining structure 321 and the second retaining structure 11 cooperate with each other to limit the rotation angle of the rotating unit 32 relative to the base 1.

[0103] During operation, the driving unit 31 can provide a positive driving force to the rotating unit 32 to drive the rotating unit 32 to rotate forward. When the first retaining structure 321 and the second retaining structure 11 cooperate, the rotating unit 32 stops rotating relative to the base 1. At this time, the driving unit 31 can continue to provide a positive force to the rotating unit 32, so that the driving unit 31 drives the shell 2 to rotate in the opposite direction relative to the base 1.

[0104] Similarly, the driving unit 31 can provide a reverse driving force to the rotating unit 32 to drive the rotating unit 32 to rotate in the reverse direction. When the first retaining structure 321 and the second retaining structure 11 cooperate, the rotating unit 32 stops rotating relative to the base 1. At this time, the driving unit 31 can continue to provide a reverse force to the rotating unit 32, so that the driving unit 31 drives the shell 2 to rotate in the forward direction relative to the base 1.

[0105] That is, when the driving unit 31 drives the rotating unit 32 to rotate, when the first resisting structure 321 resists the second resisting structure 11 , the housing 2 can be rotated in a direction opposite to the rotation direction of the rotating unit 32 .

[0106] The base 1 further includes a support base 12, and the second retaining structure 11 is actually disposed on the support base 12. In one application scenario, the second retaining structure 11 may be located above the support base 12.

[0107] like Figure 4 and Figure 6 As shown, in one embodiment, the first resisting structure 321 is a boss structure, and the second resisting structure 11 includes a first boss 111 and a second boss 112. The first boss 111 and the second boss 112 are spaced apart around the axis of the limiting ring 41, and the first resisting structure 321 is located between the first boss 111 and the second boss 112. When the rotating unit 32 rotates forward, the first resisting structure 321 can contact the first boss 111, and when the rotating unit 32 rotates reversely, the first resisting structure 321 can contact the second boss 112.

[0108] In addition, in the circumferential direction of the limiting ring 41, the first boss 111 has a first inclined surface 113, and the second boss 112 has a second inclined surface 114, a first supporting surface 115, and a third inclined surface 116 connected in sequence; the first inclined surface 113 is the surface of the first boss 111 on the side close to the second boss 112; the second inclined surface 114, the first supporting surface 115, and the third inclined surface 116 are all surfaces of the second boss 112 on the side close to the first boss 111. At this time, the side of the second boss 112 close to the first boss 111 is a step structure, and along the direction from the support seat 12 to the second retaining structure 11 (i.e., along the bottom-up direction), the second inclined surface 114, the first supporting surface 115, and the third inclined surface 116 are arranged in sequence. In addition, the first inclined surface 113 and the second inclined surface 114 can both extend to intersect with the support seat 12.

[0109] When the first resisting structure 321 resists the first boss 111 , it actually resists the first inclined surface 113 ; when the first resisting structure 321 resists the second boss 112 , it may resist the second inclined surface 114 or the third inclined surface 116 .

[0110] Along the direction from the second retaining structure 11 to the support seat 12 (i.e., from top to bottom), the first inclined surface 113 gradually approaches the second boss 112, and the second inclined surface 114 and the third inclined surface 116 gradually approach the first boss 111. The first supporting surface 115 can be a plane, and the first supporting surface 115 is perpendicular to the axis of the limiting ring 41, wherein the direction from the second retaining structure 11 to the support seat 12 is parallel to the axis of the limiting ring 41.

[0111] When the driving unit 31 drives the rotating unit 32 to rotate, when the first retaining structure 321 contacts the first inclined surface 113, the second inclined surface 114, and the third inclined surface 116, the rotating unit 32 can stop rotating relative to the base 1, and the housing 2 can rotate in a direction opposite to the rotation direction of the rotating unit 32. The inclination angle of the third inclined surface 116 can be greater than the inclination angle of the second inclined surface 114. The inclination angle of the third inclined surface 116 can be equal to the inclination angle of the first inclined surface 113.

[0112] Furthermore, the first, second, and third inclined surfaces 113, 114, and 116 are spaced apart in sequence around the circumference of the retaining ring 41. A second support surface 117 is located between the first and second inclined surfaces 113, 114. The second support surface 117 can also be a flat surface parallel to the first support surface 115, with both ends of the second support surface 117 intersecting the first and second inclined surfaces 113, 114, respectively. Around the circumference of the retaining ring 41, the spacing between the first and second inclined surfaces 113, 114, and the spacing between the second and third inclined surfaces 114, 116, are both greater than the width of the first retaining structure 321. During operation, when the first retaining structure 321 rotates between the first and second inclined surfaces 113, 114, it is supported by the second support surface 117. When the first retaining structure 321 rotates between the second and third inclined surfaces 114, 116, it is supported by the first support surface 115.

[0113] The end surface of the first boss 111 facing away from the support seat 12 (defined as the third support surface 118) and the end surface of the second boss 112 facing away from the support seat 12 (defined as the fourth support surface 119) can be flush, and the third support surface 118 and the fourth support surface 119 can both be parallel to the first support surface 115. The first inclined surface 113 can extend to intersect with the third support surface 118, and the third inclined surface 116 can extend to intersect with the fourth support surface 119.

[0114] The second retaining structure 11 may be provided in plurality, and each second retaining structure 11 is evenly arranged around the axis of the limiting ring 41, and two adjacent second retaining structures 11 are connected by a support unit 13, and the support unit 13 is provided on the support seat 12, and the end face of the support unit 13 facing away from the support seat 12 is the fifth support face 131, and one end of the fifth support face 131 intersects with the third support face 118 of the first second retaining structure 11, and the other end of the fifth support face 131 intersects with the fourth support face 119 of the second second retaining structure 11, wherein the first second retaining structure 11 and the second second retaining structure 11 are adjacently arranged.

[0115] In addition, the areas of the fifth supporting surface 131 close to the two second retaining structures 11 are all inclined areas, and the closer to the second retaining structure 11, the greater the distance between the area and the support seat 12 (that is, the greater the height), so that a concave space can be formed between the two adjacent second retaining structures 11.

[0116] In one feasible embodiment, along the circumference of the retaining ring 41, the fifth supporting surface 131 includes a first region, a second region, and a third region connected in sequence. The first region intersects with the third supporting surface 118 of one second retaining structure 11, and the third region intersects with the fourth supporting surface 119 of another second retaining structure 11. The first and third regions may be curved surfaces, and the second region may be either flat or curved.

[0117] During operation, when the housing 2 rotates relative to the base 1 about the axis of the limiting element 4, the first retaining structure 321 can simultaneously abut the second retaining structure 11 and the retaining unit 45, thereby keeping the limiting element 4 stationary relative to the base 1. For example, when the first retaining structure 321 abuts the first inclined surface 113, the first retaining structure 321 can also abut the fourth limiting surface 456, thereby keeping the limiting element 4 stationary relative to the base 1.

[0118] like Figure 6 As shown, in one embodiment, the rotating unit 32 further includes a force-receiving unit 322 , which is used to receive the force applied by the driving unit 31 , and the first resisting structure 321 is disposed on the force-receiving unit 322 .

[0119] Along the circumferential direction of the limiting ring 41, the first resisting structure 321 includes a first resisting surface 323, a second resisting surface 324 and a third resisting surface 325 connected in sequence; wherein, along the axial direction of the limiting ring 41, the second resisting surface 324 is the end face of the first resisting structure 321 away from the force-bearing unit 322, the first resisting surface 323 and the second resisting surface 324 are both inclined surfaces, and along the direction from the force-bearing unit 322 to the first resisting structure 321, the first resisting surface 323 gradually approaches the second resisting surface 324, and the second resisting surface 324 gradually approaches the first resisting surface 323. At this time, the first resisting structure 321 is a trapezoidal protrusion structure.

[0120] When the first resisting structure 321 is in conflict with the first inclined surface 113, it is actually the first resisting surface 323 that is in conflict with the first inclined surface 113; when the first resisting structure 321 is in conflict with the second inclined surface 114, it is actually the third resisting surface 325 that is in conflict with the second inclined surface 114; when the first resisting structure 321 is in conflict with the third inclined surface 116, it is actually the third resisting surface 325 that is in conflict with the third inclined surface 116; when the first supporting surface 115 supports the first resisting structure 321, it is actually the first supporting surface 115 that supports and contacts the second resisting surface 324 to support the first resisting structure 321; when the second supporting surface 117 supports the first resisting structure 321, it is actually the second supporting surface 117 that supports and contacts the second resisting surface 324 to support the first resisting structure 321.

[0121] In one embodiment, a rotating unit 32 is provided with a plurality of first resisting structures 321, each first resisting structure 321 is evenly arranged around the axis of the limiting ring 41, and each first resisting structure 321 cooperates with each second resisting structure 11. Figure 4 and Figure 6 In the example shown, three first retaining structures 321 and three second retaining structures 11 are provided, and the first retaining structures 321 are matched with the second retaining structures 11 in a one-to-one manner. In addition, when a first retaining structure 321 is matched with its corresponding second retaining structure 11, the first retaining structure 321 is located between the first boss 111 and the second boss 112 of the second retaining structure 11.

[0122] like Figure 2 and Figure 6 As shown, in one embodiment, the force-bearing unit 322 is a gear (defined as the first gear), and the driving unit 31 includes a motor 311, a first worm 312, a second worm 313, and a second gear 314, wherein the housing of the motor 311 is connected to the housing 2, the main shaft of the motor 311 is connected to the first worm 312, the first worm 312 is meshed with the second gear 314, the second gear 314 is connected to the second worm 313, and the second gear 314 is coaxially arranged with the second worm 313, and the second worm 313 is meshed with the first gear. The second worm 313 is connected to the housing 2 and can rotate relative to the housing 2 around its own axis. In addition, the axis of the first worm 312 and the axis of the second worm 313 can be perpendicular, and the axis of the first worm 312 and the axis of the second worm 313 can both be perpendicular to the axis of the limiting ring 41.

[0123] When the motor 311 drives the first worm 312 to rotate, it can also drive the second gear 314 to rotate. The second gear 314 can then drive the second worm 313 to rotate. The second worm 313 can then drive the first gear (i.e., the force-bearing unit 322) to rotate. In other words, the first worm 312 and the second gear 314 form a worm-gear mechanism, while the second worm 313 and the first gear form another worm-gear mechanism.

[0124] Before the first resisting structure 321 abuts against the second resisting structure 11 on the base 1, the driving unit 31 can drive the first gear to rotate, and at this time the shell 2 is stationary relative to the base 1; when the first gear rotates until the first resisting structure 321 abuts against the second resisting structure 11, the first gear stops rotating, so that the motor 311 can drive the shell 2 to rotate in a direction opposite to the rotation direction of the rotating unit 32.

[0125] In addition, after assembly, the first resisting structure 321 is located between the first protrusion 451 and the second protrusion 452, and the first resisting structure 321 can always be maintained between the first protrusion 451 and the second protrusion 452, wherein the direction from the first protrusion 451 to the second protrusion 452 is consistent with the direction from the first boss 111 to the second boss 112; when the first resisting structure 321 conflicts with the first boss 111, the first resisting structure 321 can also conflict with the first protrusion 451; when the first resisting structure 321 conflicts with the second boss 112, the first resisting structure 321 can also conflict with the second protrusion 452.

[0126] Moreover, when the first resisting structure 321 conflicts with the first protrusion 451 , it is actually the first resisting structure 321 that conflicts with the first limiting surface 453 ; when the first resisting structure 321 conflicts with the second protrusion 452 , the first resisting structure 321 may conflict with the second limiting surface 454 , or the first resisting structure 321 may conflict with the fourth limiting surface 456 .

[0127] refer to Figure 3 and Figure 4 The first limiting surface 453 can be parallel to the first inclined surface 113, the second limiting surface 454 can be parallel to the second inclined surface 114, the third limiting surface 455 can be parallel to the first supporting surface 115, the fourth limiting surface 456 can be parallel to the third inclined surface 116, and the fifth limiting surface 457 can be parallel to the second supporting surface 117.

[0128] In addition, when the limiting ring 41 contacts the bottom wall of the outer shell 2, in the vertical direction, the third limiting surface 455 can be flush with the first support surface 115, the fifth limiting surface 457 can be flush with the second support surface 117, the end surface a is higher than the third support surface 118, and the end surface b is higher than the fourth support surface 119.

[0129] like Figure 1 、 Figure 2 as well as Figure 7As shown, in one embodiment, the adjustment device 100 further includes a connecting assembly, which includes a connecting shaft 6 and an elastic member 7; a first limiting structure 61 and a second limiting structure 62 are provided on the connecting shaft 6; the first limiting structure 61 and the elastic member 7 are located inside the housing 2, and the second limiting structure 62 is located outside the housing 2; the elastic member 7 is compressed between the first limiting structure 61 and the rotating unit 32; the elastic member 7 presses the rotating unit 32 onto the base 1, and presses the limiting ring 41 (i.e., the limiting element 4) onto the housing 2 through the rotating unit 32, i.e., the support shaft 14 and the limiting ring 41 are located on the side of the rotating unit 32 away from the elastic member 7; the second limiting structure 62 contacts the end of the base 1 away from the rotating unit 32, and the base 1 and the housing 2 can contact each other. In this way, the base 1, the housing 2, the rotating unit 32, and the limiting element 4 can be connected together through the connecting shaft 6 and the elastic member 7.

[0130] In addition, the base 1 includes a support shaft 14 and a support flange 15, wherein the support seat 12 actually includes the support shaft 14 and the support flange 15; a first through hole 21 is provided on the outer shell 2 along the axial direction of the limiting ring 41; the support shaft 14 extends into the outer shell 2 from the first through hole 21, and the support flange 15 is arranged on the side wall of the support shaft 14, and the support flange 15 is located outside the outer shell 2 and can contact the outer shell 2 in the axial direction of the limiting ring 41; the elastic member 7 presses the rotating unit 32 on the end of the support shaft 14 extending into the outer shell 2; the second limiting structure 62 contacts the end of the support shaft 14 away from the rotating unit 32.

[0131] After assembly, the elastic force of the elastic member 7 can press the second limiting structure 62 against the support shaft 14, thereby causing the support flange 15 to contact the housing.

[0132] In one embodiment, along the axis of the limiting ring 41, a second through hole 141 is defined on the support shaft 14, and a third through hole is defined on the rotating unit 32. The support shaft 14, the limiting ring 41, and the rotating unit 32 are sleeved on the connecting shaft 6. The limiting ring 41 is sleeved on the support shaft 14, i.e., the limiting element 4 is sleeved on the support shaft 14, wherein the limiting element 4 can also rotate about its own axis relative to the support shaft 14. The connecting shaft 6 passing through the rotating unit 32 means that the connecting shaft 6 passes through the rotating unit 32 at the third through hole 326, and the connecting shaft 6 passing through the support shaft 14 means that the connecting shaft 6 passes through the support shaft 14 at the second through hole 141.

[0133] In addition, the elastic member 7 may be a coil spring, which is sleeved on the connecting shaft 6. The third through hole 326 is actually provided on the force-bearing unit 322.

[0134] In one embodiment, the second retaining structure 11 is disposed on one end face of the support shaft 14 in the axial direction of the retaining ring 41 and is located within the housing 2. The support shaft 14 is coaxial with the retaining ring 41. The retaining ring 41 is sleeved on the support shaft 14, and the support shaft 14 and the retaining ring 41 may be loosely fitted. The support shaft 14 prevents the retaining ring 41 from shaking in its radial direction.

[0135] like Figure 2 and Figure 8 As shown, in one embodiment, in the axial direction of the limiting ring 41, the housing 2 includes a first shell 22 and a second shell 23, the first shell 22 and the second shell 23 are connected and enclosed to form an installation space, and the second shell 23 is located on the side of the first shell 22 away from the support flange 15; the limiting ring 41, the driving unit 31, the rotating unit 32 and the elastic member 7 are all arranged in the installation space; the first through hole 21 is arranged on the first shell 22; the second shell 23 is provided with a fourth through hole 231, and the connecting shaft 6 is provided with a fifth through hole 63; in the axial direction of the limiting ring 41, the fourth through hole 231 passes through the second shell 23, and the fifth through hole 63 passes through the connecting shaft 6; the fourth through hole 231 and the fifth through hole 63 are arranged relative to each other.

[0136] The components installed within the housing 2 are actually installed within the installation space. The fourth through hole 231 and the fifth through hole 63 are relative to each other, meaning that, in an orthographic projection of a plane perpendicular to the axis of the retaining ring 41, the projection of the fourth through hole 231 and the projection of the fifth through hole 63 at least partially overlap. The bottom wall of the housing 2 is the bottom wall of the first shell 22, and the side walls of the housing 2 include the side walls of the first shell 22 and the side walls of the second shell 23. In one feasible embodiment, the stopper 51 is provided on the first shell 22.

[0137] After the adjustment device 100 is assembled, the fourth through hole 231 and the fifth through hole 63 can be spaced apart from each other across a portion of the installation space, and the conductive wire can pass through the adjustment device 100 from the fourth through hole 231, the fifth through hole 63 and the area opposite the installation space.

[0138] The aforementioned first through-hole is the second through-hole 141. The aforementioned second through-hole includes the first through-hole 21, the fourth through-hole 231, and a portion of the mounting space, through which the first through-hole 21 and the fourth through-hole 231 communicate. Furthermore, the first through-hole 21, the second through-hole 141, the third through-hole 326, the fourth through-hole 231, and the fifth through-hole 63 may be coaxially arranged and may all be coaxial with the retaining ring 41.

[0139] like Figure 7As described above, the first limiting structure 61 can be a flange structure set at one end of the connecting shaft 6, and the second limiting structure 62 can be a protrusion set at the other end of the connecting shaft 6, wherein the first limiting structure 61 and the second limiting structure 62 are set at intervals along the axis of the connecting shaft 6.

[0140] like Figure 5 As shown, a first avoidance groove 142 and a second avoidance groove 143 are provided on the inner surface of the second through hole 141, and the first avoidance groove 142 and the second avoidance groove 143 are arranged at intervals along the circumferential direction of the limiting ring 41; wherein, the first avoidance groove 142 passes through the support shaft 14 along the axial direction of the limiting ring 41; the second avoidance groove 143 is arranged on the surface of the support shaft 14 away from the rotating unit 32, and does not extend through the surface of the support shaft 14 close to the rotating unit 32.

[0141] During assembly, the connecting shaft 6 can be first passed through the elastic member 7, the first gear, the limiting ring 41 and the first shell 22, and then force is applied to the connecting shaft 6 along the axial direction of the connecting shaft 6 to compress the elastic member 7; then the connecting shaft 6 can be passed through the support shaft 14 from the second through hole 141, and at this time the second limiting structure 62 can pass through the support shaft 14 from the first avoidance groove 142; after the second limiting structure 62 passes through the support shaft 14 from the first avoidance groove 142, the connecting shaft 6 is rotated around its own axis so as to move the second limiting structure 62 into the second avoidance groove 143, and then the application of force along the axial direction of the connecting shaft 6 is stopped, so that the connecting shaft 6 can move along the direction from the first shell 22 to the second shell 23 under the action of the elastic member 7 until the second limiting structure 62 contacts the groove wall of the second avoidance groove 143, so that the base 1, the first gear, the limiting ring 41 and the first shell 22 can be connected together through the connecting shaft 6.

[0142] like Figure 4 and Figure 9 As shown, in one embodiment, a recessed structure 151 is provided on the surface of the support flange 15 close to the first shell 22 (this surface is defined as the first mating surface), and a protruding structure 221 is provided on the surface of the first shell 22 close to the support flange 15 (this surface is defined as the second mating surface). After assembly, the protruding structure 221 can extend into the recessed structure 151 (at this time, the shell 2 is in a lowered state). When the shell 2 rotates relative to the base 1 around the axis of the limiting ring 41, the protruding structure 221 can rotate within the recessed structure 151 and eventually rotate out of the recessed structure 151. At this time, the protruding structure 221 contacts the first mating surface, thereby raising the height of the entire shell 2 (at this time, the shell 2 is in a raised state). That is, when the shell 2 rotates around its own axis, it can move a certain distance away from the support flange 15 along the axis of the limiting ring 41.

[0143] In other embodiments, the convex structure 221 may be provided on the first mating surface, and the concave structure 151 may be provided on the second mating surface.

[0144] When the adjustment device 100 is used to connect an exterior rearview mirror to a vehicle body, it has the following application scenarios: Three second retaining structures 11 are defined: unit A, unit B, and unit C. Unit A is located between units B and C, and the direction from unit A to unit B is counterclockwise. Furthermore, the following scenarios use the first retaining structure 321, which cooperates with unit A, as an example to describe the movement of the first retaining structure 321.

[0145] Scenario 1: Electric folding exterior mirrors

[0146] Initially, the exterior rearview mirror is in the driving position, with the first retaining structure 321 located on the first support surface 115 of unit A (i.e., the second retaining surface 324 is located on the first support surface 115). The first retaining structure 321 is also located on the third limiting surface 455 (i.e., the second retaining surface 324 is located on the third limiting surface 455). The motor 311 then drives the first gear to rotate clockwise, causing the first retaining surface 323 to move toward the first inclined surface 113 until the first retaining surface 323 contacts the first inclined surface 113. This causes the first gear to stop rotating, causing the motor 311 to drive the housing 2 counterclockwise until the housing 2 contacts the first limiting block outside the adjustment device 100. The housing 2 is connected to the exterior rearview mirror and moves synchronously with the exterior rearview mirror. When the housing 2 contacts the first limiting block, the exterior rearview mirror folds into the parking position. Subsequently, when the motor 311 continues to rotate the first gear clockwise, the first gear and the housing 2 do not rotate, and the motor 311 is blocked and can be automatically shut down.

[0147] Among them, when the shell 2 rotates counterclockwise, since the shell 2 is in contact with the limit ring 41, the limit ring 41 may rotate with the shell 2 due to the friction of the shell 2. When the first limit surface 453 conflicts with the first supporting structure 321, the limit ring 41 no longer rotates with the shell 2.

[0148] Scenario 2: Electric deployment of exterior mirrors

[0149] Initially, the exterior rearview mirror is in the parking position, and the first retaining structure 321 is located on the second supporting surface 117 of unit A and also on the fifth limiting surface 457 . Then, the motor 311 drives the first gear to rotate counterclockwise until the first resisting structure 321 conflicts with the second inclined surface 114. Subsequently, the first gear stops rotating, so that the motor 311 can drive the shell 2 to rotate clockwise. At this time, the shell 2 can also drive the limit ring 41 to rotate clockwise until the second limit surface 454 of the limit ring 41 conflicts with the first resisting structure 321. At this time, the limit ring 41 stops rotating (that is, the blocking force provided by the first resisting structure 321 to the limit ring 41 is greater than the friction force provided by the shell 2 to the limit ring 41), and the shell 2 continues to rotate clockwise until the stop block 51 conflicts with the resisting surface 431. Subsequently, when the shell 2 continues to rotate clockwise, it can continue to drive the limit ring 41 to rotate clockwise until the first resisting structure 321 conflicts with the fourth limit surface 456. Subsequently, the motor 311 is blocked and can be automatically shut down.

[0150] Scenario 3: Manually folding the exterior mirror backwards from the driving position

[0151] Initially, the exterior rearview mirror is in the driving position, and the first retaining structure 321 is located on the first support surface 115 of unit A. The first retaining structure 321 is also located on the third limiting surface 455. Then, manually apply force to the outer shell 2 to rotate the outer shell 2 counterclockwise. At this time, the outer shell 2 will drive the motor 311, the first gear, and the limiting ring 41 to rotate counterclockwise until the rear outer shell 2 contacts the first limiting block, thereby achieving the folding of the rearview mirror. At this time, the first retaining structure 321 is located above surface n (surface n is the fifth support surface 131 between unit A and unit B). Moreover, the outer shell 2 is in a raised state, and the limiting ring 41 is also raised. In this way, the third limiting surface 455 of the limiting ring 41 lifts the first gear, so that the first retaining structure 321 is separated from surface n by a certain distance. In addition, the state at this time is defined as the first state.

[0152] Based on the first state, the exterior rearview mirror is manually deployed by manually rotating the housing 2 clockwise until the exterior rearview mirror is rotated to the driving position. When the housing 2 rotates clockwise, the stopper 51 cooperates with the abutment surface 431 to apply force to the limit ring 41, thereby driving the limit ring 41 to rotate clockwise.

[0153] Based on the first state, the exterior mirrors are electrically deployed. From an ergonomic perspective, the driver will subconsciously toggle the mirror folding and deployment switch, causing the motor 311 to drive the mirrors to deploy. Specifically, the motor 311 drives the first gear to rotate counterclockwise. Before the first retaining structure 321 reaches the third support surface 118 of unit B, it abuts against surface n, stopping its rotation and causing the housing 2 to rotate clockwise. When the housing 2 rotates clockwise, the stopper 51 of the housing 2 can come into contact with the abutment surface 431, thereby driving the limiting ring 41 to rotate clockwise together with the housing 2 until the fourth limiting surface 456 of the limiting ring 41 comes into contact with the first abutment structure 321 of the first gear. At this point, the power of the motor 311 driving the rearview mirror to deploy acts on the limiting ring 41 from two opposite directions through the cooperation between the fourth limiting surface 456 and the first abutment structure 321, and the cooperation between the stopper 51 and the abutment surface 431. As a result, the motor 311 will be stalled and automatically shut down. In other words, the exterior rearview mirror will not deploy.

[0154] From the perspective of ergonomics, since the exterior rearview mirror does not respond when it is unfolded, the driver may try to turn the rearview mirror folding and unfolding switch in the opposite direction (ie, to drive the motor 311 to fold the exterior rearview mirror).

[0155] At this time, the motor 311 drives the first gear to rotate clockwise. Before the first retaining structure 321 reaches the fourth supporting surface 119 of the unit A, the following may occur:

[0156] Case 1: If the first gear stops rotating due to the slope of surface n and the pressure of the elastic member 7. At this time, the housing 2 will rotate counterclockwise until the housing 2 contacts the first limit block. At this time, the exterior rearview mirror is in the parking position. Subsequently, the motor 311 continues to drive the unit 31 gear to rotate clockwise until the first retaining structure 321 contacts the first inclined surface 113 of unit A. At this time, the first gear returns to the position during electric folding, and the motor 311 is blocked and shut down. During this process, the exterior rearview mirrors may fold with each other without any response. From an ergonomic point of view, at this time the driver will try to toggle the mirror folding and unfolding switch in the opposite direction, that is, the motor 311 drives the exterior rearview mirror to unfold. Among them, the subsequent process of electrically driving the exterior rearview mirror to unfold can refer to the description of scenario 2.

[0157] Scenario 2: If the first gear does not stop rotating due to the slope of surface n and the pressure of elastic member 7, the motor 311 will continue to drive the first gear to rotate clockwise until the first retaining structure 321 contacts the first inclined surface 113 of unit A. At this time, the first gear returns to the position during electric folding, and the motor 311 is blocked and shut down. During this process, the exterior mirrors will fold without responding to each other. From an ergonomic point of view, the driver will try to toggle the mirror folding and unfolding switch in the opposite direction, causing the motor 311 to drive the exterior mirrors to unfold. The subsequent process of electrically driving the exterior mirrors to unfold can refer to the description of scenario 2.

[0158] Scenario 4: Manually folding the exterior mirror forward from the driving position

[0159] Initially, the exterior rearview mirror is in the driving position, and the first retaining structure 321 is located on the first support surface 115 of unit A. The first retaining structure 321 is also located on the third limiting surface 455. Then, manually apply force to the housing 2 to rotate it clockwise. At this time, the housing 2 will drive the motor 311, the first gear, and the limiting ring 41 to rotate clockwise together until the rear housing 2 contacts the second limiting block outside the adjustment device 100. The second limiting block can be installed on the vehicle body. At this time, the housing 2 cannot continue to fold forward. The first retaining structure 321 is located above surface m (surface m is the fifth support surface 131 between unit A and unit C). Moreover, the housing 2 is in a raised state, and the limiting ring 41 is also raised. In this way, the third limiting surface 455 of the limiting ring 41 lifts the first gear, so that the first retaining structure 321 is separated from surface n by a certain distance. In addition, the state at this time is defined as the second state.

[0160] On the basis of the second state, it is manually folded back to the initial position: the housing 2 is manually driven to rotate counterclockwise until the recessed structure 151 and the first protrusion 451 structure re-enter the recessed structure 151 and return to the initial state, that is, the exterior rearview mirror returns to the driving position.

[0161] Based on the second state, the mirror is electrically folded back to the initial position. From an ergonomic point of view, the driver may try to turn the mirror folding and unfolding switch toward the folding direction, which causes the motor 311 to drive the exterior mirror to fold. At this time, the motor 311 drives the first gear to rotate clockwise. Before the first limiting structure 61 reaches the fourth support surface 119 of unit C, the following may occur:

[0162] In case 1, if the first gear stalls due to the slope of surface m and spring pressure, the housing 2 will rotate counterclockwise until it contacts the first stopper, causing the exterior mirror to move to the parking position. Subsequently, the motor 311 will continue to drive the gear clockwise until the first stop structure 321 contacts the first inclined surface 113 of unit C. At this point, the motor 311 will stall and automatically shut down. Subsequently, the exterior mirror can be controlled to move back to the driving position by electrically deploying it.

[0163] In the second scenario, if the first gear does not stall due to the slope of surface m and the spring pressure, it will continue to rotate clockwise until the first stop structure 321 contacts the first inclined surface 113 of unit C. At this point, the first gear will stall, and the housing 2 will rotate counterclockwise until it contacts the first stop. At this point, the motor 311 will stall and automatically shut down. Subsequently, the exterior mirrors can be controlled by electrically deploying them to rotate back to the driving position.

[0164] During the clockwise rotation of the gear, the first resisting structure 321 will contact the first limiting surface 453, thereby driving the limiting block to rotate clockwise. During this process, the rotation angle of the limiting ring 41 will exceed 120 degrees (taking the limiting ring 41 as an example with three limiting units 43), so that the block 51 will contact the guide surface 432, causing the limiting unit 43 to pass through the block 51.

[0165] Scenario 5: The exterior rearview mirror is manually extended forward from the parking position to the driving position or beyond the driving position. Beyond the driving position means that after the exterior rearview mirror is rotated forward to the driving position, it continues to fold forward a certain distance.

[0166] Initially, the exterior rearview mirror is in the parking position, and the first retaining structure 321 is located on the second support surface 117 of unit A and also on the fifth limiting surface 457. Manually driving the housing 2 clockwise, the housing 2 drives the motor 311, the second gear 314, and the limiting ring 41 to rotate clockwise until the housing 2 rotates the exterior rearview mirror to the driving position or until the housing 2 contacts the second limiting block. At this point, the first retaining structure 321 is located on surface m. This state is defined as the third state.

[0167] On the basis of the third state, the housing 2 is manually folded back to the initial position: a force is manually applied to the housing 2 to drive the housing 2 to rotate counterclockwise until it contacts the first limit block.

[0168] On the basis of the third state, the mirror is electrically folded back to the initial position: on this basis, from the perspective of ergonomics, the driver will subconsciously turn the rearview mirror folding and unfolding switch to allow the motor 311 to drive the exterior rearview mirror to fold back to its original position.

[0169] Specifically, the motor 311 drives the first gear to rotate clockwise. Before the first resisting structure 321 reaches the third supporting surface 118 of the unit C, the following situations may occur:

[0170] In case 1, if the first gear stalls due to the slope of surface m and spring pressure, housing 2 will rotate counterclockwise until it contacts the first stopper. Then, motor 311 will continue to drive the first gear clockwise until the first stop structure 321 contacts the first inclined surface 113 of unit C. At this point, motor 311 will stall and automatically shut down.

[0171] Case 2: If the first gear does not stop due to the slope of surface m and the spring pressure, the first gear will continue to rotate clockwise until the first blocking structure 321 contacts the first inclined surface 113 of unit C. At this time, the first gear stops, and then the shell 2 rotates counterclockwise until the shell 2 contacts the first limit block. At this time, the motor 311 will be stalled and automatically shut down.

[0172] Scenario 6: The exterior mirror is manually extended forward from the parking position but does not reach the driving position

[0173] Initially, the exterior rearview mirror is in the parking position, with the first retaining structure 321 located on the second support surface 117 of unit A and also on the fifth limiting surface 457. Manually driving the housing 2 clockwise, the housing 2 drives the motor 311, the second gear 314, and the limiting ring 41 to rotate clockwise a certain angle. This state is defined as the fourth state.

[0174] On the basis of the fourth state, the housing 2 is manually folded back to the initial position: a force is manually applied to the housing 2 to drive the housing 2 to rotate counterclockwise until it contacts the first limit block.

[0175] On the basis of the fourth state, the exterior rearview mirror is electrically unfolded to the driving position: On this basis, from the perspective of ergonomics, the driver will subconsciously turn the rearview mirror unfolding switch at this time, causing the motor 311 to drive the exterior rearview mirror to unfold forward.

[0176] At this point, the motor 311 drives the first gear to rotate counterclockwise until the first retaining structure 321 contacts the second limiting surface 454 (at this point, the first retaining structure 321 does not contact the second retaining structure 11), which in turn drives the limiting ring 41 to rotate counterclockwise. This causes the retaining surface 431 to contact the block 51, causing the motor 311 to stall and automatically shut down. At this point, the exterior mirror does not respond to deployment. Subsequently, the driver toggles the mirror folding switch, causing the motor 311 to drive the exterior mirror to fold backward. The subsequent working process can be referred to the above description.

[0177] The present invention also provides an exterior rearview mirror assembly, comprising an exterior rearview mirror and the adjustment device 100 described in any one of the above embodiments, wherein the exterior rearview mirror is connected to the housing 2 of the adjustment device 100. Specifically, the exterior rearview mirror can be mounted on a side of the second housing 23 facing away from the first housing 22.

[0178] The present invention also provides a vehicle comprising an exterior rearview mirror and the exterior rearview mirror assembly described in any one of the above embodiments. Alternatively, the vehicle comprises an exterior rearview mirror and the adjustment device 100 described in any one of the above embodiments, wherein the adjustment device 100 can also be used to connect other components.

[0179] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0180] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A limiting element, characterized in that: It includes a limiting ring (41), an elastic unit (42) and a limiting unit (43); The limiting unit (43) is connected to the limiting ring (41) through the elastic unit (42); The elastic unit (42) can generate elastic deformation along the radial direction of the limiting ring (41) to drive the limiting unit (43) to move in the radial direction of the limiting ring (41).

2. The limiting element according to claim 1, characterized in that: The limiting unit (43) protrudes from the outer side surface of the limiting ring (41) along the radial direction of the limiting ring (41).

3. The limiting element according to claim 1, characterized in that: There are multiple elastic units (42), and each elastic unit (42) is arranged around the axis of the limiting ring (41); Each of the elastic units (42) is connected to the limiting unit (43).

4. The limiting element according to claim 3, characterized in that: The elastic units (42) are evenly arranged around the axis of the limiting ring (41); and / or, The limiting units (43) are evenly arranged around the axis of the limiting ring (41).

5. The limiting element according to claim 1, characterized in that: The elastic unit (42) is connected to the outer side surface of the limiting ring (41), and the limiting unit (43) is connected to the surface of the elastic unit (42) facing away from the limiting ring (41).

6. The limiting element according to claim 5, characterized in that: The elastic unit (42) and the limiting ring (41) enclose a contraction space (44), and the elastic unit (42) can elastically deform toward the contraction space (44).

7. The limiting element according to claim 1, characterized in that: The limiting ring (41), the elastic unit (42) and the limiting unit (43) are integrally formed.

8. The limiting element according to claim 1, characterized in that: The limiting unit (43) has a resisting surface (431) and a guiding surface (432); Along the circumferential direction of the limiting ring (41) and along the direction from the blocking surface (431) to the guiding surface (432), the guiding surface (432) gradually approaches the limiting ring (41).

9. The limiting element according to claim 1, characterized in that: The limiting element further includes a blocking unit (45), and the blocking unit (45) is connected to the limiting ring (41); Along the circumferential direction of the limiting ring (41), the blocking unit (45) includes a first protrusion (451) and a second protrusion (452) arranged at intervals; In the axial direction of the limiting ring (41), the first protrusion (451) and the second protrusion (452) protrude from the limiting ring (41) in the same direction.

10. The limiting element according to claim 9, characterized in that: There are a plurality of the retaining units (45), and each retaining unit (45) is arranged on the same end surface of the retaining ring (41) around the axis of the retaining ring (41).

11. An adjusting device, characterized in that: It comprises a base (1), a housing (2), and a limiting element (4) according to any one of claims 1 to 10; The housing (2) is connected to the base (1) and is capable of rotating relative to the base (1) around the axis of the limiting element (4); The housing (2) is provided with a rotation angle limiting structure (5); When the housing (2) rotates relative to the base (1) around the axis of the limiting element (4), the limiting element (4) and the base (1) remain relatively stationary; The rotation angle limiting structure (5) cooperates with the limiting element (4) to limit the rotation angle of the housing (2) relative to the base (1).

12. The adjustment device according to claim 11, characterized in that The limiting unit (43) has a resisting surface (431) and a guiding surface (432); when the limiting element (4) rotates about its own axis and in a direction from the guiding surface (432) to the resisting surface (431), the resisting surface (431) can abut against the rotation angle limiting structure (5) to prevent the limiting element (4) from rotating in a positive direction relative to the rotation angle limiting structure (5); When the limiting element (4) rotates around its own axis and along the direction from the blocking surface (431) to the guiding surface (432), the guiding surface (432) can abut against the rotation angle limiting structure (5), so that the limiting unit (43) is subjected to a force in the radial direction of the limiting element (4), thereby causing the elastic unit (42) to elastically deform, so that the limiting unit (43) can pass through the rotation angle limiting structure (5).

13. The adjustment device according to claim 11, characterized in that The limiting element (4) is arranged in the housing (2); In the radial direction of the limiting ring (41), the limiting unit (43) is spaced apart from the inner side wall of the outer shell (2).

14. The adjustment device according to claim 11, characterized in that The rotation angle limiting structure (5) is a stopper (51) provided on the inner side wall of the outer shell (2).

15. The adjustment device according to claim 11, characterized in that The adjusting device further comprises a driving element (3); the driving element (3) is used to drive the housing (2) so that the housing (2) can rotate relative to the base (1) around the axis of the limiting element (4).

16. The adjustment device according to claim 15, characterized in that The driving element (3) comprises a driving unit (31) and a rotating unit (32), and both the driving unit (31) and the rotating unit (32) are arranged in the housing (2); The driving unit (31) is connected to the housing (2) and is used to drive the rotating unit (32) to rotate around its own axis, and the rotating unit (32) is coaxial with the housing (2) and the limiting element (4); The rotating unit (32) is provided with a first retaining structure (321), and the base (1) is provided with a second retaining structure (11); the first retaining structure (321) and the second retaining structure (11) cooperate with each other to limit the rotation angle of the rotating unit (32) relative to the base (1).

17. The adjustment device according to claim 16, characterized in that The limiting element (4) includes a blocking unit (45); When the housing (2) rotates relative to the base (1) around the axis of the limiting element (4), the first retaining structure (321) can simultaneously abut against the second retaining structure (11) and the retaining unit (45), so as to keep the limiting element (4) and the base (1) relatively stationary.

18. The adjustment device according to claim 16, characterized in that The regulating device further comprises a connecting shaft (6) and an elastic member (7); a first limiting structure (61) and a second limiting structure (62) are provided on the connecting shaft (6); the first limiting structure (61) and the elastic member (7) are located inside the housing (2), and the second limiting structure (62) is located outside the housing (2); The elastic member (7) is compressed between the first limiting structure (61) and the rotating unit (32); The elastic member (7) presses the rotating unit (32) onto the base (1), and presses the limiting element (4) onto the housing (2) through the rotating unit (32); The second limiting structure (62) abuts against an end of the base (1) facing away from the rotating unit (32).

19. The adjustment device according to claim 18, characterized in that The base (1) comprises a support shaft (14) and a support flange (15); Along the axial direction of the limiting element (4), the housing (2) is provided with a first through hole (21); The support shaft (14) extends into the housing (2) through the first through hole (21); the support flange (15) is provided on a side wall of the support shaft (14); the support flange (15) is located outside the housing (2) and is capable of contacting the housing (2) in the axial direction of the limiting element (4); The elastic member (7) presses the rotating unit (32) against one end of the support shaft (14) extending into the housing (2); The second limiting structure (62) abuts against an end of the support shaft (14) that faces away from the rotating unit (32).

20. The adjustment device according to claim 19, characterized in that The supporting shaft (14), the limiting element (4) and the rotating unit (32) are sleeved on the connecting shaft (6); The limiting element (4) is sleeved on the supporting shaft (14).

21. The adjustment device according to claim 18, characterized in that In the axial direction of the limiting element (4), the housing (2) comprises a first shell (22) and a second shell (23), the first shell (22) and the second shell (23) being connected and enclosing to form an installation space; the second shell (23) is located on a side of the first shell (22) facing away from the supporting flange (15); The limiting element (4), the driving unit (31), the rotating unit (32), and the elastic member (7) are all arranged in the installation space; The first through hole 21 is provided on the first shell (22); The second shell (23) is provided with a fourth through hole (231), and the connecting shaft (6) is provided with a fifth through hole (63) opposite to the fourth through hole (231); In the axial direction of the limiting element (4), the fourth through hole (231) passes through the second shell (23), and the fifth through hole (63) passes through the connecting shaft (6).

22. An exterior rearview mirror assembly, characterized in that: The invention comprises an exterior rearview mirror and an adjusting device (100) according to any one of claims 11 to 21, wherein the exterior rearview mirror is connected to a housing (2) of the adjusting device (100).

23. A vehicle, characterized in that: It comprises the exterior rearview mirror assembly according to claim 22, or it comprises the adjustment device (100) according to any one of claims 11 to 21.

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