Automotive central rearview mirror

Abstract

A kind of automobile central rearview mirror, including mirror seat, the front side of cabin facing is provided with mirror piece, the back of mirror seat is connected with the mirror seat support rod fixed on the body by ball head and spherical crown face articulation, mirror seat support rod is connected with first limit rod, second limit rod, the free end of first limit rod, second limit rod extends to the back of mirror seat, the free end of first limit rod, second limit rod and the ball center of ball head are not collinear arrangement, when the free end of first limit rod, second limit rod and the back of mirror seat abut, mirror piece is at the reflection light of the incident light of rear glass windshield, and the reflection light is directed to the normal observation direction of driver vision.The free end of first limit rod, second limit rod and ball head cooperate with each other, limit and support mirror seat, even if mirror seat is miscontacted and deflection, just pull mirror seat to the reference position of the free end of first limit rod, second limit rod again abut, it can be reset to the previous normal observation angle, it is convenient for driver and passenger to quickly reset the deflection of central rearview mirror.

Description

Technical Field

[0001] The present application relates to automobile parts, and in particular to an automobile central rearview mirror. Background Art

[0002] The central rearview mirror of a car is one of the important components used to observe objects behind the vehicle inside the car. It can be used to supplement the field of view of the left and right rearview mirrors outside the car, judge the obstacles behind or the distance to the following vehicle, etc. During driving, the left and right rearview mirrors are used in conjunction with the central rearview mirror inside the car to ensure driving safety.

[0003] Currently, the center rearview mirror of a car is typically mounted on the top of the car's windshield or on the roof near the top of the windshield via a bracket. The bracket is hinged to the mirror base via a ball-jointed joint. Before driving, the driver can adjust the mirror base's vertical and horizontal angles on the bracket by turning the mirror base, adjusting the mirror's position to ensure the driver can see the scene behind the vehicle, corresponding to the rear windshield, through the mirror, meeting driving safety requirements. However, the ball-jointed connection between the mirror base and the bracket relies on friction to prevent the base from swinging freely; it lacks a rigid support to limit the base's angular deflection. Even if the driver has adjusted the mirror base to the appropriate angle based on their needs, if the center rearview mirror is accidentally touched during driving or in other unexpected circumstances, causing the center rearview mirror's angle to change, the driver will find it difficult to quickly and accurately adjust the center rearview mirror to the previously appropriate position, making it difficult to reset the center rearview mirror. If this situation occurs while driving, the inconvenience of resetting the center rearview mirror can seriously impact driving safety. Summary of the Invention

[0004] The invention provides a central rearview mirror for an automobile, which provides position limiting support for the central rearview mirror and can assist the central rearview mirror to quickly reset after being accidentally touched.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted is: a central rearview mirror of a car, including a mirror base, a lens is arranged on the front side of the mirror base facing the cockpit, the back side of the mirror base is hingedly connected to the mirror base support rod fixed to the car body through a ball head and a spherical crown surface, the mirror base support rod is connected to a first limit rod and a second limit rod, the free ends of the first limit rod and the second limit rod extend toward the back side of the mirror base, the free ends of the first limit rod and the second limit rod are non-collinearly arranged with the center of the ball head, and when the free ends of the first limit rod and the second limit rod abut against the back side of the mirror base, the reflected light of the incident light on the rear windshield of the lens points to the direction of normal observation of the driver's vision.

[0006] Compared with the prior art, the technical effect of the present invention is that when the free ends of the first limit rod and the second limit rod abut against the back of the mirror seat, the reflected light of the incident light of the lens on the rear windshield points to the normal observation direction of the driver's vision, and the first limit rod, the second limit rod and the ball head cooperate with each other to play the role of limiting support for the mirror seat. Even if the mirror seat is accidentally touched and deflected, it only needs to be moved to the reference position where the free ends of the first limit rod and the second limit rod abut against the free ends of the first limit rod and the second limit rod again to reset it to the previous normal observation angle. It can also be operated with one hand, which makes it convenient for drivers and passengers to quickly reset the deflection of the central rearview mirror and ensure driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the front side of the three-dimensional appearance of the present invention;

[0008] Figure 2 This is a schematic diagram of the structure on the back of the mirror mount;

[0009] Figure 3 This is a schematic diagram of the local structure on the back of the mirror mount;

[0010] Figure 4 for Figure 3 K-direction view in;

[0011] Figure 5 for Figure 3 A magnified view of part A in FIG;

[0012] Figure 6 for Figure 4 A magnified view of part B in FIG;

[0013] Figure 7 It is a schematic diagram of the vertical hinge shaft and the auxiliary support in the separated state;

[0014] Figure 8a This is a schematic diagram of the locking seat in the locked position;

[0015] Figure 8b This is a schematic diagram of the locking seat in the disengaged position;

[0016] Figure 9 Schematic diagram of the rocker extending in the opposite direction along the long diameter of the cam;

[0017] Figure 10 This is a schematic diagram of the split structure of the locking seat and the vertical articulated shaft;

[0018] Figure 11 Schematic diagram of the fixation between the connecting sleeve and the mirror base support rod. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-11 And related content, the present invention is further described in detail:

[0020] The application discloses an automobile central rearview mirror, which comprises a mirror seat 10, a mirror lens 11 arranged on the front side of the mirror seat 10 facing the cabin, a mirror seat supporting rod 20 fixed on the vehicle body and connected with the back of the mirror seat 10 through a ball head and a spherical crown surface, a first limiting rod 32 and a second limiting rod 42 connected with the mirror seat supporting rod 20, and the free ends of the first limiting rod 32 and the second limiting rod 42 extend towards the back of the mirror seat 10, and the free ends of the first limiting rod 32 and the second limiting rod 42 are arranged in a non-collinear mode with the ball center of the ball head, and when the free ends of the first limiting rod 32 and the second limiting rod 42 abut against the back of the mirror seat 10, the mirror lens 11 is arranged in a mode that the reflected light of the incident light of the rear glass windshield is directed to the normal observation direction of the driver.

[0021] In the above scheme, the free ends of the first limiting rod 32 and the second limiting rod 42 are arranged in a non-collinear mode with the ball center of the ball head, three points form a supporting surface, and when the free ends of the first limiting rod 32 and the second limiting rod 42 abut against the back of the mirror seat 10, the mirror lens 11 is arranged in a mode that the reflected light of the incident light of the rear glass windshield is directed to the normal observation direction of the driver. The first limiting rod 32, the second limiting rod 42 and the ball head cooperate with each other to support and limit the mirror seat 10. Since the positions of the first limiting rod 32 and the second limiting rod 42 and the ball head are fixed and cannot be moved, the supporting surface formed thereby serves as a reference position of the mirror seat 10. Even if the mirror seat 10 is accidentally bumped and deviated, the mirror seat 10 can be reset to the previous normal observation angle by pulling the mirror seat 10 back to the reference position where the free ends of the first limiting rod 32 and the second limiting rod 42 abut against the back of the mirror seat 10 again. The operation can be performed by one hand, which is convenient for the driver and the passenger to quickly reset the central rearview mirror after deviation and ensures the driving safety.

[0022] It should be noted that, in the scheme, the normal observation angle refers to the angle at which the driver can conveniently observe the rear of the vehicle through the central rearview mirror when driving the vehicle in a normal sitting posture. In addition, since one end of the first limiting rod 32 and the second limiting rod 42 is arranged on the mirror seat supporting rod 20 and the free ends extend towards the back of the mirror seat 10, the first limiting rod 32 and the second limiting rod 42 are arranged in a range that is blocked by the central rearview mirror and observed by the driver, so that the arrangement of the first limiting rod 32 and the second limiting rod 42 does not interfere with the normal observation of the central rearview mirror by the driver.

[0023] Further, the free end of the first limiting rod 32 and the back of the mirror seat 10 are arranged in a region above or below the ball head, and the free end of the second limiting rod 42 and the back of the mirror seat 10 are arranged in a region left or right of the ball head, to form a butt joint. Figure 2As shown in the figure, the free end of the first limiting rod 32 abuts against the area on the back of the mirror base 10 above the ball head, and the first limiting rod 32 can limit the upward deflection of the mirror base 10, while the free end of the second limiting rod 42 abuts against the area on the back of the mirror base 10 to the right of the ball head, and the second limiting rod 42 can limit the rightward deflection of the mirror base 10. The first limiting rod 32 and the second limiting rod 42 cooperate with each other to provide vertical and horizontal limiting support for the mirror base 10, serving as a reference position for the subsequent mirror base 10, and facilitating the reset of the mirror base 10 after deflection. It should be noted that the free end of the first limit rod 32 is limited to the area above the ball head on the back of the mirror base 10, and the free end of the second limit rod 42 is limited to the area to the right of the ball head on the back of the mirror base 10. Once the posture of the mirror base 10 changes and leaves the limit support position and needs to be reset, for vehicles with left-hand steering wheels such as those used in my country, using the right hand to hold the mirror base 10 upward and to the right to reset is the most natural force state, and the above scheme also ensures that the first limit rod 32 and the second limit rod 42 will not appear in the driver's field of view when the driver observes the central rearview mirror normally; for vehicles with right-hand steering wheels such as those used in Hong Kong, China, the United Kingdom, etc., the free end of the second limit rod 42 can be set to the area to the left of the ball head on the back of the limit mirror base 10.

[0024] Taking into account that different drivers have different angles of observation for the central rearview mirror, in order to adapt to the usage needs of different drivers, the mirror base support rod 20 is provided with limiting guides for limiting the displacement of the free ends of the first limiting rod 32 and the second limiting rod 42 toward the back of the mirror base 10. By controlling the displacement of the free ends of the first limiting rod 32 and the second limiting rod 42 toward the back of the mirror base 10, the limiting support points of the first limiting rod 32 and the second limiting rod 42 are changed, thereby changing the swing angle limit of the mirror base 10 to meet the adjustment needs of different drivers.

[0025] As a preferred solution, Figure 2 、 3 As shown, the mirror base support rod 20 is provided with a guide rail 31 extending toward the back of the mirror base 10. A first limiting rod 32 is connected to a sliding sleeve 321 that forms a guide and limiting engagement with the guide rail 31. A locking unit is provided between the sliding sleeve 321 and the guide rail 31 to lock or release the relative position restriction between the sliding sleeve 321 and the guide rail 31. In this embodiment, by controlling the movement of the sliding sleeve 321 on the guide rail 31, the mirror base support rod 20 connected to the sliding sleeve 321 can be moved closer to or further away from the mirror base 10. The relative position of the free end of the first limiting rod 32 is adjusted according to the driver's needs to limit the fore-and-aft deflection angle of the mirror base 10 and meet different support requirements. After the first limiting rod 32 is adjusted, the locking unit can be used to lock the sliding sleeve 321 to the guide rail 31, preventing the sliding sleeve 321 from freely moving on the guide rail 31 and thus preventing the first limiting rod 32 from providing fixed-point support.

[0026] Further, in combination with Figure 3 , 4 , 5, 6, the guide rail 31 is provided with a positioning groove 311 with an upward opening at a regular interval along the length direction of the guide rail 31. The length direction of the positioning groove 311 is perpendicular to the length direction of the guide rail 31. A strip-shaped baffle 312 is arranged above the opening of the positioning groove 311. The strip-shaped baffle 312 is arranged at an interval between the surface of the opening of the positioning groove 311 and the strip-shaped baffle 312, and spans the positioning groove 311 and is connected to the front and rear ends of the guide rail 31. A U-shaped sliding sleeve 321 with a downward opening is arranged on the strip-shaped baffle 312 and the guide rail 31 from top to bottom. A positioning rod 3211 connected to the sliding sleeve 321 is parallel to the length direction of the positioning groove 311 and is arranged in the corresponding positioning groove 311. When the relative position of the first limiting rod 32 and the guide rail 31 needs to be adjusted, the sliding sleeve 321 can be pulled upward to disengage the positioning rod 3211 from the positioning groove 311 and move to the interval between the strip-shaped baffle 312 and the surface of the opening of the positioning groove 311. At this time, the sliding sleeve 321 can be controlled to move along the guide rail 31 to control the free end of the first limiting rod 32 to approach or move away from the back of the mirror seat 10. Then, by pressing the sliding sleeve 321 downward, the positioning rod 3211 is again inserted into the corresponding positioning groove 311, and the relative position between the sliding sleeve 321 and the guide rail 31 is locked by the limiting action of the positioning groove 311, thereby achieving the position adjustment and locking of the first limiting rod 32.

[0027] It should be noted that the groove wall of the positioning groove 311 has a certain elasticity, so as to be able to embed or remove the positioning rod 3211 in or from the positioning groove 311. At the same time, the interval distance between the strip-shaped baffle 312 and the surface of the opening of the positioning groove 311 is greater than the rod diameter of the positioning rod 3211, so as to ensure that the positioning rod 3211 does not interfere with the positioning groove 311 when moving forward and backward after pulling the sliding sleeve 321 upward.

[0028] As a preferred solution, as shown in Figure 2 , 3 , the mirror seat support rod 20 is connected with a secondary support 40. A second limiting rod 42 is connected to the secondary support 40 through a vertical hinge shaft 41. An angle control mechanism is arranged between the secondary support 40 and the second limiting rod 42 to control the rotation angle of the second limiting rod 42. By controlling the free end of the second limiting rod 42 to approach or move away from the back of the mirror seat 10, the limiting support point of the mirror seat 10 by the second limiting rod 42 is changed, so as to change the limiting degree of the left and right deflection angle of the mirror seat 10 to meet the adjustment needs of the driver. In this solution, the second limiting rod 42 is pivoted around the vertical hinge shaft 41 to swing, so as to control the free end of the second limiting rod 42 to approach or move away from the back of the mirror seat 10. The rotation amplitude of the second limiting rod 42 is controlled by the angle control mechanism to meet different adjustment needs.

[0029] Further, combined with Figure 3 、 4 As shown in Figures 7, 8a, 8b, and 9, the auxiliary support 40 includes an upper support plate 401A and a lower support plate 401B arranged at an upper and lower intervals, and the vertical hinge shaft 41 is located between the upper support plate 401A and the lower support plate 401B. The locking seat 411 connected to the second limit rod 42 is located in the area between the upper support plate 401A and the lower support plate 401B, and the locking seat 411 and the opposite sides of the upper support plate 401A and / or the lower support plate 401B are provided with matching toothed surfaces along the rotation path direction of the locking seat 411. The toothed surface of the locking seat 411 is in a separation position where it avoids the toothed surface of the upper support plate 401A and / or the lower support plate 401B or is in a locking position where it engages with the toothed surface of the upper support plate 401A and / or the lower support plate 401B.

[0030] When the toothed surface of the locking seat 411 is in a separated position, where it avoids the toothed surface of the upper support plate 401A and / or the lower support plate 401B, that is, the locking seat 411 is in a movable state, the second limiting rod 42 and the locking seat 411 can rotate about the vertical hinge axis 41, thereby adjusting the free end of the second limiting rod 42 to move closer to or farther from the mirror base 10. When the toothed surface of the locking seat 411 is in a locked position, where it engages with the toothed surface of the upper support plate 401A and / or the lower support plate 401B, the locking seat 411 cannot move, and the second limiting rod 42 connected thereto cannot rotate about the vertical hinge axis 41, thus fixing the position of the second limiting rod 42. This achieves the rotation adjustment and locking of the second limiting rod 42.

[0031] Combine Figure 7 、 8a As shown in , 8b, one end of the lower support plate 401B is hingedly connected to the upper support plate 401A through a horizontal hinge shaft 402, and the upper end of the vertical hinge shaft 41 is hingedly connected to the end of the upper support plate 401A opposite to the free end of the lower support plate 401B, and the lower end of the vertical hinge shaft 41 passes through the through hole 4011 on the free end plate body of the lower support plate 401B and extends downward, and the locking seat 411 and the opposite sides of the lower support plate 401B are provided with mutually matching toothed surfaces, and the lower end of the vertical hinge shaft 41 is provided with a cam 412, and the protrusion of the cam 412 is in a locking position that presses against the lower plate body 401B to drive the toothed surface of the locking seat 411 to engage with the toothed surface on the lower plate body 401B, or in a separation position that separates from the lower plate body 401B to drive the toothed surface on the locking seat 411 and the toothed surface on the lower plate body 401B to avoid each other.

[0032] In this solution, it is sufficient to set mutually matching toothed surfaces on the opposite sides of the locking seat 411 and the lower support plate 401B. When the protrusion of the cam 412 is in the locking position where it presses against the lower plate body 401B to drive the toothed surface of the locking seat 411 to engage with the toothed surface on the lower plate body 401B, the lower plate body 401B is pressed against the locking seat 411 by the protrusion of the cam 412, and the toothed surfaces on the opposite sides of the two are tightly engaged, thereby limiting the free rotation of the locking seat 411 and the second limit rod 42. When the protrusion of the cam 412 is in the separation position where it separates from the lower plate body 401B and drives the toothed surface on the locking seat 411 and the toothed surface on the lower plate body 401B to avoid each other, the protrusion of the cam 412 is separated from the lower plate body 401B and will not press against the lower plate body 401B. The lower plate body 401B can swing downward relative to the upper plate body 401A with the horizontal hinge shaft 402 as the axis, so that the toothed surfaces on the opposite sides of the lower plate body 401B and the locking seat 411 are separated from each other, and the locking seat 411 is not affected by the toothed surface of the lower plate body 401B and can move, so that the locking seat 411 and the second limit rod 42 can be rotated and adjusted.

[0033] Combine Figure 10 As shown, considering that the locking seat 411 and the vertical hinge shaft 41 are connected in a conjoined structure, which may cause inconvenience in installing or removing the vertical hinge shaft 41 and the auxiliary support 40, the second limiting rod 42 and the vertical hinge shaft 41 are connected by the locking seat 411. The locking seat 411 is arranged in a C shape, and the shaft body of the vertical hinge shaft 41 located in the area between the upper support plate 401A and the lower support plate 401B is embedded in the slot in the middle of the locking seat 411 through the opening on the circumference of the locking seat 411. The locking seat 411 and the shaft body of the vertical hinge shaft 41 adopt a split structure. The vertical hinge shaft 41 does not need to be moved. The locking seat 411, as a movable component, can be disassembled and assembled separately, which is convenient for use and maintenance.

[0034] As a preferred solution, combined Figure 7 、 8a As shown in FIG. 8 b , the cam 412 is hingedly connected to the lower end of the vertical hinge shaft 41 via a camshaft 4121. A swing lever 4122 connected to the cam 412 is used to control the rotation of the cam 412 about the camshaft 4121. The cam 412 can be driven to rotate by toggling the swing lever 4122, thereby controlling the protrusion of the cam 412 to press against the lower half 401B or to cancel the protrusion's pressure on the lower half 401B, thereby controlling the movement of the locking seat 411. The provision of the swing lever 412 makes it easier to control the rotation of the cam 412.

[0035] Furthermore, considering that the horizontally positioned swing link 4122 may deflect downward due to the weight of the link and vehicle jolting, causing the protruding portion of the cam 412 to rotate to a position separated from the lower half 401B, the angle between the length direction of the swing link 4122 and the major diameter direction of the cam 412 is obtuse. This ensures that the overall position of the swing link 4122 is biased downward, preventing excessive deflection due to the weight of the link and vehicle jolting. This ensures that the protruding portion of the cam 412 remains pressed against the lower half 401B, effectively locking the locking seat 411 and preventing it from moving freely, thereby ensuring the stable position of the locked second limiting rod 42.

[0036] Combine Figure 9 As shown, in this embodiment, the swing arm 4122 extends in the opposite direction of the long axis of the cam 412 from the position opposite the protrusion on the cam 412. Thus, when the locking seat 411 is locked, the entire shaft of the swing arm 4122 is vertical and prevents it from swinging upward due to its own weight or vehicle jolts. In this state, the cam 412 is more stable when pressing against the lower half 401B. It should be noted that the long axis of the cam 412 is the direction of the line connecting the center of the cam 412 and the apex of the protrusion.

[0037] As a preferred solution, Figure 2 、 3 As shown in Figures 4 and 5, a connecting sleeve 30 is sleeved on the end of the mirror base support rod 20 adjacent to the ball head, and the aforementioned limiting and guiding fittings are all provided on the connecting sleeve 30. In this solution, the first and second limiting rods 32, 42 and the corresponding guiding and limiting fittings can be provided on the connecting sleeve 30, which is then further connected to the mirror base support rod 20. There is no need to modify the main structure of the mirror base support rod 20. The entire structure can be pre-assembled and then connected to the mirror base support rod 20, making assembly more convenient.

[0038] In addition, if Figure 11As shown, in order to further adjust the range of movement of the first and second limit rods 32 and 42 to expand the support requirements of the first and second limit rods 32 and 42 for the mirror base 10, the connecting sleeve 30 is movably connected to the rod body of the rod end section of the mirror base support rod 20 near the ball head, and a locking rod 33 is provided on the connecting sleeve 30. The locking rod 33 and the connecting sleeve 30 are hingedly connected by a hinge shaft 331. The axial core direction of the hinge shaft 331 is perpendicular to the sleeve core direction of the connecting sleeve 30. The rod end section of the mirror base support rod 20 near the ball head is arranged with limit grooves 21 at intervals along its rod core direction. One end of the locking rod 33 near the mirror base support rod 20 is in a fixed position in the limit groove 21 to limit the relative movement of the connecting sleeve 30 and the mirror base support rod 20, or is in a movable position to avoid the limit groove 21. In this embodiment, the inner end of the locking rod 33 passes through the through hole on the peripheral surface of the connecting sleeve 30 to abut against the limiting groove 21; the outer end of the locking rod 33 extends to the outside of the connecting sleeve 30 to facilitate the control of the locking rod 33 to move.

[0039] The locking rod 33 can be swung about the hinge axis 331 by toggling it, controlling whether the end of the locking rod 33, which is adjacent to the base support rod 20, abuts against the limiting groove 21. When the end of the locking rod 33 abuts against the limiting groove 21, the relative movement of the connecting sleeve 30 and the base support rod 20 is restricted, thereby ensuring that the first and second limiting rods 32 and 42 remain stable relative to the base support rod 20 during use. When the end of the locking rod 33 is out of the limiting groove 21, the fixation between the connecting sleeve 30 and the mirror base support rod 20 is cancelled, and the connecting sleeve 30 and the first and second limiting rods 32 and 42 can be controlled to slide along the axial direction of the sleeve section that matches on the mirror base support rod 20, thereby expanding the range of movement of the first and second limiting rods 32 and 42 to meet different adjustment requirements. After controlling the connecting sleeve 30 to slide to the specified position, the end of the locking rod 33 is used to push into the corresponding limiting groove 21 again to achieve the re-fixation between the connecting sleeve 30 and the mirror base support rod 20.

[0040] In addition, a torsion spring can be installed on the hinge shaft 331. By utilizing the elastic force of the torsion spring, the end of the locking rod 33 will not easily disengage when it abuts the limiting groove 21, ensuring that the connecting sleeve 30 is limited to the corresponding rod section position of the mirror base support rod 20.

Claims

1. A central rearview mirror for an automobile, comprising a mirror base (10), a lens (11) being provided on the front side of the mirror base (10) facing the front of the cockpit, the back side of the mirror base (10) being hingedly connected to a mirror base support rod (20) fixed to the vehicle body via a ball head and a spherical crown surface, characterized in that: The mirror base support rod (20) is connected to a first limiting rod (32) and a second limiting rod (42), the free ends of the first limiting rod (32) and the second limiting rod (42) extend toward the back of the mirror base (10), the free ends of the first limiting rod (32) and the second limiting rod (42) are arranged non-collinearly with the center of the ball head, and when the free ends of the first limiting rod (32) and the second limiting rod (42) abut against the back of the mirror base (10), the reflected light of the incident light of the lens (11) on the rear windshield is directed in the direction of normal observation of the driver's vision; A limiting guide is provided on the mirror base support rod (20) for limiting the displacement of the free end of the first limiting rod (32) toward the back of the mirror base (10); A guide rail (31) extending toward the back of the mirror base (10) is provided on the mirror base support rod (20); a sliding sleeve (321) is connected to the first limiting rod (32) and forms a guide limiting fit with the guide rail (31); a locking unit is provided between the sliding sleeve (321) and the guide rail (31) for locking or releasing the relative position restriction between the sliding sleeve (321) and the guide rail (31); The guide rail (31) is provided with a closed-end positioning groove (311) with a notch facing upwards and arranged at adjacent intervals along the rail length direction. The notch length direction of the positioning groove (311) is perpendicular to the length direction of the guide rail (31). A strip baffle (312) is provided above the notch of the positioning groove (311). The notch surface of the positioning groove (311) and the strip baffle (312) are arranged at intervals. The strip baffle (312) spans the positioning groove (311) and is connected to the front and rear ends of the guide rail (31) at both ends. A U-shaped sliding sleeve (321) with an opening facing downwards is clamped on the strip baffle (312) and the guide rail (31) from top to bottom. A positioning rod (3211) connected to the sliding sleeve (321) is parallel to the notch length direction of the positioning groove (311) and is clamped in the corresponding positioning groove (311).

2. The automobile central rearview mirror according to claim 1, characterized in that: The free end of the first limiting rod (32) forms a contact fit with an area on the back of the mirror base (10) located above or below the ball head, and the free end of the second limiting rod (42) forms a contact fit with an area on the back of the mirror base (10) located on the left or right side of the ball head.

3. The automobile central rearview mirror according to claim 1 or 2, characterized in that: A limiting guide fitting is provided on the mirror base support rod (20) for limiting the displacement of the free end of the second limiting rod (42) toward the back side of the mirror base (10).

4. The automobile central rearview mirror according to claim 3, characterized in that: The mirror base support rod (20) is connected to a secondary support (40), the second limiting rod (42) is hingedly connected to the secondary support (40) via a vertical hinge shaft (41), and an angle control mechanism for controlling the rotation angle of the second limiting rod (42) is provided between the secondary support (40) and the second limiting rod (42).

5. The automobile central rearview mirror according to claim 4, characterized in that: The auxiliary support (40) includes an upper support plate (401A) and a lower support plate (401B) arranged at an upper and lower intervals, a vertical hinge shaft (41) is located between the upper support plate (401A) and the lower support plate (401B), a locking seat (411) connected to the second limiting rod (42) is located in the area between the upper support plate (401A) and the lower support plate (401B), and the locking seat (411) and the upper support plate (401A) and / or the lower support plate (401B) are provided with mutually matching toothed surfaces along the rotation path direction of the locking seat (411), and the toothed surface of the locking seat (411) is in a separation position in which it avoids the toothed surface of the upper support plate (401A) and / or the lower support plate (401B) or in a locking position in which it meshes with the toothed surface of the upper support plate (401A) and / or the lower support plate (401B).

6. The automobile central rearview mirror according to claim 5, characterized in that: One end of the lower support plate (401B) is hingedly connected to the upper support plate (401A) through a horizontal hinge shaft (402), the upper end of the vertical hinge shaft (41) is hingedly connected to the end of the upper support plate (401A) opposite to the free end of the lower support plate (401B), the lower end of the vertical hinge shaft (41) passes through the through hole (4011) on the free end plate body of the lower support plate (401B) and extends downward, the locking seat (411) and the lower support plate (401B) are connected. ) are provided with toothed surfaces that cooperate with each other on opposite sides of the vertical hinge shaft (41), and a cam (412) is provided at the lower end of the vertical hinge shaft (41), and the protrusion of the cam (412) is in a locking position where it presses against the lower support plate (401B) to drive the toothed surface of the locking seat (411) to engage with the toothed surface on the lower support plate (401B) or in a separation position where it separates from the lower support plate (401B) to drive the toothed surface on the locking seat (411) and the toothed surface on the lower support plate (401B) to avoid each other.

7. The automobile central rearview mirror according to claim 5 or 6, characterized in that: The second limiting rod (42) and the vertical hinge shaft (41) are connected by a locking seat (411). The locking seat (411) is arranged in a C shape. The shaft body of the vertical hinge shaft (41) is located in the area between the upper support plate (401A) and the lower support plate (401B) and is embedded in the slot hole in the middle of the locking seat (411) through the opening on the peripheral surface of the locking seat (411).

8. The automobile central rearview mirror according to claim 6, characterized in that: The cam (412) is hingedly connected to the lower end of the vertical hinge shaft (41) via a cam shaft (4121), and a rocker rod (4122) connected to the cam (412) is used to control the cam (412) to rotate about the cam shaft (4121).

9. The automobile central rearview mirror according to claim 8, characterized in that: The angle between the length direction of the rocker rod (4122) and the long diameter direction of the cam (412) is an obtuse angle.

10. The automobile central rearview mirror according to claim 8, characterized in that: The rocker rod (4122) extends in the opposite direction of the long diameter direction of the cam (412) from a position relative to the protruding portion on the cam (412).

11. The automobile central rearview mirror according to claim 3, characterized in that: A connecting sleeve (30) is sleeved on the rod end section of the mirror base support rod (20) adjacent to the ball head, and the position limiting guide fittings are all arranged on the connecting sleeve (30).

12. The automobile central rearview mirror according to claim 11, characterized in that: The connecting sleeve (30) is movably connected to the rod body of the rod end section of the mirror base support rod (20) adjacent to the ball head. A locking rod (33) is provided on the connecting sleeve (30). The locking rod (33) and the connecting sleeve (30) are hingedly connected by a hinge shaft (331). The axis core direction of the hinge shaft (331) is perpendicular to the sleeve core direction of the connecting sleeve (30). The rod end section of the mirror base support rod (20) adjacent to the ball head is arranged with limiting grooves (21) at intervals along the rod core direction. One end of the locking rod (33) adjacent to the mirror base support rod (20) is located in a fixed position in the limiting groove (21) to limit the relative movement of the connecting sleeve (30) and the mirror base support rod (20) or in a movable position to avoid the limiting groove (21).

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