An electric limit switch and a car

Abstract

This invention relates to the field of automotive parts technology, and discloses an electric limiter and an automobile. The electric limiter includes: a nut, a sleeve, a motor, a flexible shaft, a mounting housing, a reducer, a screw, a connecting rod for connection with a car door, a first gear mounted on the flexible shaft, and a second gear rotatably mounted inside the mounting housing; the sleeve is connected to the mounting housing; the motor is mounted inside the mounting housing; the output shaft of the motor is coaxially connected to the flexible shaft; the input end of the reducer is connected to the first gear, and the output end of the reducer is connected to the second gear; the screw is coaxially connected to the second gear. In this embodiment of the invention, the first gear and the output shaft of the motor are connected by a flexible shaft, avoiding a rigid connection between them. During the rotation of the motor output shaft, even if there is misalignment between the first gear and the motor output shaft, the flexible shaft can compensate for the eccentricity error through its own deformation, preventing the first gear from wobbling and thus reducing the vibration noise of the first gear.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to an electric limiter and an automobile. Background Technology

[0002] Currently, electric limit switches are widely used in the automotive field. By driving the car with electric limit switches, the side doors of the car can be opened and closed automatically, which greatly improves the convenience of using the car.

[0003] Because the existing electric limit switch structure connects the first gear and the motor output shaft directly through the shaft coupling, when used for a long time or when there are assembly deviations, the first gear and the motor output shaft will become eccentric. The motor output shaft will wobble severely during rotation, which will cause the entire structure to vibrate and generate noise, thereby reducing the service life of the electric limit switch. Summary of the Invention

[0004] The purpose of this invention is to provide an electric limiter and automobile that can prevent the first gear from deflecting.

[0005] To achieve the above objectives, the present invention provides an electric limiter, comprising: a nut, a sleeve, a motor, a flexible shaft, a mounting housing, a reducer, a screw, a connecting rod for connection with a vehicle door, a first gear disposed on the flexible shaft, and a second gear rotatably disposed within the mounting housing; the sleeve is connected to the mounting housing;

[0006] The motor is housed within the mounting housing; the output shaft of the motor is coaxially connected to the flexible shaft; the input end of the reducer is connected to the first gear, and the output end of the reducer is connected to the second gear; the screw is coaxially connected to the second gear; the nut is threadedly connected to the screw and slides within the sleeve; the connecting rod is connected to the nut.

[0007] Optionally, the screw extends along a first straight line; the nut is provided with a ball head; the ball head has a first plane, a first arcuate surface, a second plane, and a second arcuate surface in sequence along its circumferential direction; the first plane and the second plane are opposite to each other and spaced apart along a second straight line; the end of the connecting rod is provided with a mounting hole adapted to the ball head; the mounting hole has a first arcuate wall, a first side wall, a second arcuate wall, and a second side wall in sequence; the first side wall and the second side wall are spaced apart along the axial direction of the connecting rod; the first side wall is provided with a first recess adapted to the first arcuate surface; the second side wall is provided with a second recess adapted to the second arcuate surface;

[0008] When the ball head is inserted into the mounting hole, the first plane is opposite to the first sidewall, the second plane is opposite to the second sidewall, the first arc-shaped surface is opposite to the first arc-shaped wall, and the second arc-shaped surface is opposite to the second arc-shaped wall.

[0009] When the ball head is engaged in the mounting hole, the first plane is opposite to the first arc-shaped wall, the first arc-shaped surface is engaged in the first recess, the second plane is opposite to the second arc-shaped wall, and the second arc-shaped surface is engaged in the second recess.

[0010] Optionally, the first plane and the second plane are arranged parallel to each other; the first sidewall and the second sidewall are arranged parallel to each other; the distance between the first plane and the second plane is D1; ​​the distance between the first sidewall and the second sidewall is D2; and the diameter of the ball head is D3.

[0011] The following conditions must be met: D1 < D2, D3 > D2.

[0012] Optionally, the reducer includes: a first input shaft, a first output shaft, a third gear, a fourth gear, a fifth gear, and a sixth gear; the first input shaft and the first output shaft are rotatably disposed within the mounting housing; the third gear and the fourth gear are sleeved on the first input shaft; the fifth gear and the sixth gear are sleeved on the first output shaft; the third gear meshes with the first gear; the fourth gear meshes with the fifth gear; and the sixth gear meshes with the second gear.

[0013] The third gear has more teeth than the fourth gear; the fifth gear has more teeth than the sixth gear.

[0014] Optionally, the sleeve has an opening at one end away from the mounting housing; the connecting rod extends through the opening to the outside of the sleeve; and an anti-collision rubber strip is provided at the edge of the opening.

[0015] Optionally, it also includes: a first guide bar and a second guide bar; the first guide bar and the second guide bar are respectively disposed on the nut; a first guide groove and a second guide groove are formed in the sleeve along a first straight direction; the first guide bar is slidably disposed in the first guide groove; the second guide bar is slidably disposed in the second guide groove.

[0016] Optionally, it also includes: a cover; the mounting shell has an installation opening on the side facing away from the sleeve; the cover is placed over the installation opening.

[0017] Optionally, it further includes: a first bearing and a second bearing; a first hole is provided inside the cover; a second hole is provided inside the mounting shell; the first bearing is disposed in the first hole; the second bearing is disposed in the second hole; a first sleeve and a second sleeve are respectively provided at both ends of the first gear along the first straight direction; the first sleeve and the second sleeve are respectively sleeved on the flexible shaft; the first bearing is sleeved on the outside of the first sleeve; the second bearing is sleeved on the outside of the second sleeve.

[0018] Optionally, it further includes: a coupling; the coupling is connected to the output shaft of the motor, the coupling has a retaining hole, and the flexible shaft is retained in the retaining hole; the flexible shaft has a first part, a second part, and a third part sequentially along the first straight direction; the diameter of the second part is larger than the diameter of the first part and the third part; the inner diameter of the first sleeve and the diameter of the retaining hole are smaller than the inner diameter of the first gear; the first part is disposed inside the first sleeve; the second part is disposed inside the second gear; and the third part is disposed in the coupling.

[0019] An automobile includes: an electric limiter as described in any of the preceding claims.

[0020] Compared with the prior art, the electric limiter and automobile of this invention have the following advantages:

[0021] In this embodiment of the invention, a flexible shaft is used to connect the first gear and the output shaft of the motor, avoiding a rigid connection between the first gear and the output shaft of the motor. During the rotation of the motor output shaft, even if the first gear and the motor output shaft are not concentric, the flexible shaft can compensate for the eccentricity error through its own deformation, avoiding the first gear from wobbling, thereby reducing the vibration noise of the first gear. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of AA in an embodiment of the present invention;

[0024] Figure 3 yes Figure 2 Enlarged diagram of A in the middle;

[0025] Figure 4 yes Figure 2 Enlarged diagram of B in the middle;

[0026] Figure 5 This is a schematic diagram of the sleeve structure in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the connection relationship between the motor, coupling, flexible shaft and first gear in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the connection relationship between the ball head and the connecting rod in an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the connection relationship between the ball head and the connecting rod in an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the connection relationship between the ball head and the connecting rod in an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the ball head structure in an embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the connecting rod in an embodiment of the present invention;

[0033] Figure 12 This is a schematic diagram of the connecting rod in an embodiment of the present invention;

[0034] Figure 13 This is a schematic diagram of the reducer in an embodiment of the present invention.

[0035] In the diagram, 1. Nut; 2. Sleeve; 21. Opening; 3. Motor; 4. Flexible shaft; 41. First part; 42. Second part; 43. Third part; 5. Mounting housing; 6. Reducer; 61. First input shaft; 62. First output shaft; 63. Third gear; 64. Fourth gear; 65. Fifth gear; 66. Sixth gear; 7. Screw; 8. Connecting rod; 81. Mounting hole; 811. First arc-shaped wall; 812. First side wall; 8121 813. First recessed portion; 814. Second arc-shaped wall; 815. Second side wall; 816. Second recessed portion; 9. First gear; 10. Second gear; 11. Ball head; 117. First plane; 118. First arc-shaped surface; 119. Second plane; 110. Second arc-shaped surface; 12. Anti-collision strip; 15. First sleeve; 16. Second sleeve; 17. Coupling; 18. Cover; 19. First bearing; 20. Second bearing; 22. L-shaped fastener. Detailed Implementation

[0036] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0037] First, it should be noted that the directions such as top, bottom, upward, and downward mentioned in this article are defined relative to the directions in the various accompanying figures. They are relative concepts and therefore can change depending on their different positions and practical applications. Therefore, these or other directions should not be interpreted as restrictive terms.

[0038] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude the plural.

[0039] Furthermore, it should be noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the accompanying drawings, can still be combined among these technical features (or their equivalents) to obtain other embodiments of this application not directly mentioned herein.

[0040] It should also be understood that while the terms "first," "second," etc., are used in this document to describe various types of information, this information should not be limited to these terms, which are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0041] It should be noted that in different figures, the same reference numerals denote the same or substantially the same components.

[0042] like Figures 1-13 As shown, a preferred embodiment of the present invention provides an electric limiter comprising: a nut 1, a sleeve 2, a motor 3, a flexible shaft 4, a mounting housing 5, a reducer 6, a screw 7, a connecting rod 8 for connection with a vehicle door, a first gear 9 mounted on the flexible shaft 4, and a second gear 10 rotatably mounted within the mounting housing 5. The sleeve 2 is connected to the mounting housing 5.

[0043] See Figure 2 , Figure 3 , Figure 4 as well as Figure 6 The motor 3 is housed within the mounting housing 5. The output shaft of the motor 3 is coaxially connected to the flexible shaft 4. The input end of the reducer 6 is connected to the first gear 9, and the output end of the reducer 6 is connected to the second gear 10. The screw 7 is coaxially connected to the second gear 10. The nut 1 is threadedly connected to the screw 7 and slides within the sleeve 2. The connecting rod 8 is connected to the nut 1.

[0044] In the existing electric limit switch structure, the first gear 9 and the output shaft of the motor 3 are directly connected through the shaft coupling 17. This can lead to eccentricity between the first gear 9 and the output shaft of the motor 3 during long-term use or assembly deviations. The output shaft of the motor 3 will experience severe wobble during rotation, resulting in vibration and noise throughout the structure, thus reducing the service life of the electric limit switch. To solve this problem, this application uses a flexible shaft 4 to connect the first gear 9 and the output shaft of the motor 3, avoiding a rigid connection. Even if the first gear 9 and the output shaft of the motor 3 are not concentric during rotation, the flexible shaft 4 can compensate for the eccentricity error through its own deformation, preventing the first gear 9 from wobble and reducing vibration and noise.

[0045] It is understandable that the flexible shaft 4 is composed of a central spindle and five layers of 65Mn spring steel wires wound alternately around the spindle, so it can rotate reliably in both directions, has excellent toughness, and has no dead angle of rotation.

[0046] Further, see Figures 7-12 The screw 7 extends along a first straight line. A ball head 11 is provided on the nut 1. The ball head 11 has, in sequence, a first plane 111, a first arcuate surface 112, a second plane 113, and a second arcuate surface 114 along its circumferential direction. The first plane 111 and the second plane 113 are opposite to each other and spaced apart along a second straight line, meaning that two planes are cut radially from the ball head 11, and these two planes are parallel. The first arcuate surface 112 and the second arcuate surface 114 are the uncut outer contour of the ball head 11. A mounting hole 81 adapted to the ball head 11 is provided at the end of the connecting rod 8. The mounting hole 81 has, in sequence, a first arcuate wall 811, a first side wall 812, a second arcuate wall 813, and a second side wall 814. The first side wall 812 and the second side wall 814 are spaced apart along the axial direction of the connecting rod 8. The first sidewall 812 has a first recess 8121 that matches the first arcuate surface 112. The second sidewall 814 has a second recess 8141 that matches the second arcuate surface 114. The cross-section of the first sidewall 812 towards the second sidewall 814 in the mounting hole 81 matches the cross-section of the first plane 111 towards the second plane 113 in the ball head 11, so that the ball head 11 can be inserted into the mounting hole 81. This application can improve the assembly speed between the connecting rod 8, nut 1 and screw 7 during the production process by setting the ball head 11 and the mounting hole 81 of the connecting rod 8.

[0047] Among them, see Figure 8When it is necessary to assemble nut 1 and screw 7, first insert ball head 11 into the mounting hole 81 so that the first plane 111 is opposite to the first side wall 812, the second plane 113 is opposite to the second side wall 814, the first arc surface 112 is opposite to the first arc wall 811, and the second arc surface 114 is opposite to the second arc wall 813.

[0048] See Figure 9 After the ball head 11 is inserted into the mounting hole 81, it needs to be secured within the mounting hole 81. By rotating the connecting rod 8 around the ball head 11, the first plane 111 is aligned with the first arc-shaped wall 811, and the second plane 113 is aligned with the second arc-shaped wall 813. The first arc-shaped surface 112 is secured within the first recess 8121, and the second arc-shaped surface 114 is secured within the second recess 8141. At this point, the ball head 11 and the connecting rod 8 are assembled. The ball head 11 and the connecting rod 8 are connected through the engagement between the first arc-shaped surface 112 and the first recess 8121, and the second arc-shaped surface 114 and the second... The locking mechanism between the recesses 8141 achieves a snap-fit ​​connection. Compared to the previous installation method of using screws to lock the connecting rod 8 onto the nut 1, the installation method using the ball head 11 and mounting hole 81 in this application can improve the assembly speed between the connecting rod 8, nut 1, and screw 7 during the production process. Secondly, the snap-fit ​​method allows for a certain amount of play between the connecting rod 8 and the ball head 11. When there are installation errors or deformations between the door and the frame, the connecting rod 8 and the ball head 11 can adapt to the aforementioned installation errors or deformations through the movement of the ball head 11 within the mounting hole 81, thereby improving the adaptability of the electric limiter in this application.

[0049] Further, the first plane 111 and the second plane 113 are arranged parallel to each other, and the first sidewall 812 and the second sidewall 814 are arranged parallel to each other. The distance between the first plane 111 and the second plane 113 is D1, and the distance between the first sidewall 812 and the second sidewall 814 is D2; the diameter of the ball head 11 is D3. The following conditions must be met: D1 < D2, D3 > D2. D1 < D2 ensures that when the first plane 111 is parallel to the first sidewall 812 and the second plane 113 is parallel to the second sidewall 814, the ball head 11 can be inserted into the mounting hole 81. D3 > D2 ensures that when the first arcuate surface 112 is engaged in the first recess 8121 and the second arcuate surface 114 is engaged in the second recess 8141, the ball head 11 cannot be pulled out of the mounting hole 81, thus achieving the locking and fixing of the ball head 11 and the connecting rod 8.

[0050] Further, see Figure 13The reducer 6 includes: a first input shaft 61, a first output shaft 62, a third gear 63, a fourth gear 64, a fifth gear 65, and a sixth gear 66; the first input shaft 61 and the first output shaft 62 are rotatably disposed within the mounting housing 5; the third gear 63 and the fourth gear 64 are sleeved on the first input shaft 61; the fifth gear 65 and the sixth gear 66 are sleeved on the first output shaft 62; the third gear 63 meshes with the first gear 9; the fourth gear 64 meshes with the fifth gear 65; and the sixth gear 66 meshes with the second gear 10.

[0051] The third gear 63 has more teeth than the fourth gear 64; the fifth gear 65 has more teeth than the sixth gear 66.

[0052] This application uses a motor 3 to drive the first gear 9 to rotate, which in turn drives the third gear 63 to rotate. Since the third gear 63 and the fourth gear 64 are coaxially arranged, the third gear 63 can drive the fourth gear 64, which is on the same axis, to rotate. The fourth gear 64 meshes with the fifth gear 65 so that the fourth gear 64 drives the fifth gear 65 to rotate. Since the fifth gear 65 is coaxially arranged with the sixth gear, the fifth gear 65 can drive the sixth gear 66, which is on the same axis, to rotate. The sixth gear 66 meshes with the second gear 10 so that the sixth gear 66 drives the second gear 10 to rotate. The second gear 10 is coaxially connected with the screw 7, so it can drive the screw 7 to rotate, thereby increasing the torque.

[0053] Further, see Figure 2 and Figure 5 The sleeve 2 has an opening 21 at one end away from the mounting shell 5. The connecting rod 8 extends through the opening 21 to the outside of the sleeve 2. An anti-collision strip 12 is provided on the edge of the opening 21. When the connecting rod 8 moves along the first straight direction, it will collide with the edge of the opening 21. The collision between metals will cause noise and damage to the connecting rod 8. Therefore, the anti-collision strip 12 is provided in this application so that when the connecting rod 8 moves along the first straight direction and collides with the edge of the opening 21, the connecting rod 8 will collide with the anti-collision strip 12 to reduce noise and prevent damage to the connecting rod 8.

[0054] Furthermore, this application also includes: a first guide bar and a second guide bar. The first guide bar and the second guide bar are respectively disposed on the nut 1. A first guide groove and a second guide groove are formed in the sleeve 2 along a first straight direction. The first guide bar slides in the first guide groove and the second guide bar slides in the second guide groove. By sliding the first guide bar in the first guide groove and the second guide bar in the second guide groove, the sliding accuracy of the nut 1 in the mounting shell 5 can be improved.

[0055] Further, see Figure 2 This application also includes a cover 18. The mounting shell 5 has a mounting opening on the side facing away from the sleeve 2. The cover 18 is placed over the mounting opening.

[0056] Further, see Figure 6 This application also includes: a first bearing 19 and a second bearing 20. A first hole is provided inside the cover 18, and a second hole is provided inside the mounting shell 5. The first bearing 19 is disposed in the first hole, and the second bearing 20 is disposed in the second hole. A first sleeve 15 and a second sleeve 16 are respectively provided at both ends of the first gear 9 along the first straight direction. The first sleeve 15 and the second sleeve 16 are respectively sleeved on the flexible shaft 4. The first bearing 19 is sleeved on the outside of the first sleeve 15, and the second bearing 20 is sleeved on the outside of the second sleeve 16. During assembly, the first bearing 19 can be first installed on the cover 18, then the second bearing 20 can be installed on the mounting shell, and then the first sleeve 15 can be inserted into the first bearing 19. During the process of covering the cover 18 to the mounting opening, the second sleeve 16 can be inserted into the second bearing 20. This simplifies the assembly process and improves assembly efficiency. Furthermore, the arrangement of the first bearing 19 and the second bearing 20 makes the rotation of the first gear 9 more stable.

[0057] Further, see Figure 2 and Figure 6This application also includes a coupling 17. The coupling 17 is connected to the output shaft of the motor 3, and a retaining hole is provided on the coupling 17, in which the flexible shaft 4 is retained. The flexible shaft 4 has a first part 41, a second part 42, and a third part 43 sequentially along the first straight direction. The diameter of the second part 42 is larger than the diameters of the first part 41 and the third part 43. The inner diameter of the first sleeve 15 and the diameter of the retaining hole are smaller than the inner diameter of the first gear 9. The first part 41 is disposed inside the first sleeve 15, the second part 42 is disposed inside the second gear 10, and the third part 43 is disposed in the coupling 17. Since the second part 42 has the largest diameter, when the flexible shaft 4 moves axially, it is always limited by the first sleeve 15 and the coupling 17, thereby fixing the position of the flexible shaft 4 and preventing the flexible shaft 4 from shifting.

[0058] Furthermore, an L-shaped fastener 22 is provided on the mounting shell 5. The L-shaped fastener 22 is snapped onto the mounting shell 5, and the electric limiter of this application can have an additional lug for fixing this application.

[0059] This application also provides a car that includes the electric limiter as described above.

[0060] In summary, the embodiments of the present invention provide an electric limiter and an automobile, which are connected between the first gear 9 and the output shaft of the motor 3 by a flexible shaft 4, avoiding a rigid connection between the first gear 9 and the output shaft of the motor 3. During the rotation of the output shaft of the motor 3, even if the first gear 9 and the output shaft of the motor 3 are not concentric, the flexible shaft 4 can compensate for the eccentricity error through its own deformation, avoiding the first gear 9 from wobbling, thereby reducing the vibration noise of the first gear 9.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An electric limit switch, characterized in that, include: Nut, sleeve, motor, flexible shaft, mounting housing, reducer, screw, connecting rod for connection with the car door, first gear mounted on the flexible shaft, second gear rotatably mounted in the mounting housing; the sleeve is connected to the mounting housing; The motor is housed within the mounting housing; the motor's output shaft is coaxially connected to the flexible shaft; the input end of the reducer is connected to the first gear, and the output end of the reducer is connected to the second gear; the screw is coaxially connected to the second gear; the nut is threadedly connected to the screw and slides within the sleeve; the connecting rod is connected to the nut. The screw extends along a first linear direction; The nut is provided with a ball head; the ball head has a first plane, a first arcuate surface, a second plane, and a second arcuate surface in sequence along its circumferential direction; the first plane and the second plane are opposite to each other and spaced apart along a second straight line; the end of the connecting rod is provided with a mounting hole adapted to the ball head; the mounting hole has a first arcuate wall, a first side wall, a second arcuate wall, and a second side wall in sequence; the first side wall and the second side wall are spaced apart along the axial direction of the connecting rod; the first side wall has a first recess adapted to the first arcuate surface; the second side wall has a second recess adapted to the second arcuate surface; When the ball head is inserted into the mounting hole, the first plane is opposite to the first sidewall, the second plane is opposite to the second sidewall, the first arc-shaped surface is opposite to the first arc-shaped wall, and the second arc-shaped surface is opposite to the second arc-shaped wall. When the ball head is engaged in the mounting hole, the first plane is opposite to the first arc-shaped wall, the first arc-shaped surface is engaged in the first recess, the second plane is opposite to the second arc-shaped wall, and the second arc-shaped surface is engaged in the second recess.

2. The electric limit switch according to claim 1, characterized in that, The first plane and the second plane are arranged parallel to each other; the first sidewall and the second sidewall are arranged parallel to each other; the distance between the first plane and the second plane is D1; ​​the distance between the first sidewall and the second sidewall is D2; the diameter of the ball head is D3; The following conditions must be met: D1 < D2, D3 > D2.

3. The electric limit switch according to claim 1, characterized in that, The reducer includes: a first input shaft, a first output shaft, a third gear, a fourth gear, a fifth gear, and a sixth gear; the first input shaft and the first output shaft are rotatably disposed within the mounting housing; the third gear and the fourth gear are sleeved on the first input shaft; the fifth gear and the sixth gear are sleeved on the first output shaft; the third gear meshes with the first gear; the fourth gear meshes with the fifth gear; and the sixth gear meshes with the second gear. The third gear has more teeth than the fourth gear; the fifth gear has more teeth than the sixth gear.

4. The electric limit switch according to claim 1, characterized in that, Also includes: A first guide bar and a second guide bar; the first guide bar and the second guide bar are respectively disposed on the nut; a first guide groove and a second guide groove are formed inside the sleeve along a first straight line direction; the first guide bar is slidably disposed in the first guide groove; the second guide bar is slidably disposed in the second guide groove.

5. The electric limit switch according to claim 1, characterized in that, Also includes: The cover; the mounting shell has an installation opening on the side facing away from the sleeve; the cover is placed over the installation opening.

6. The electric limiter according to claim 5, characterized in that, Also includes: A first bearing and a second bearing; a first hole is provided inside the cover; a second hole is provided inside the mounting shell; the first bearing is disposed in the first hole; the second bearing is disposed in the second hole; a first sleeve and a second sleeve are respectively provided at both ends of the first gear along the first straight direction; the first sleeve and the second sleeve are respectively sleeved on the flexible shaft; the first bearing is sleeved on the outside of the first sleeve; the second bearing is sleeved on the outside of the second sleeve.

7. The electric limit switch according to claim 6, characterized in that, Also includes: A coupling; the coupling is connected to the output shaft of the motor, and the coupling has a retaining hole in which the flexible shaft is retained; the flexible shaft has a first part, a second part, and a third part in sequence along the first straight line direction; the diameter of the second part is larger than the diameters of the first part and the third part; the inner diameter of the first sleeve and the diameter of the retaining hole are smaller than the inner diameter of the first gear; The first part is disposed inside the first sleeve; the second part is disposed inside the second gear; and the third part is connected to the coupling.

8. A car, characterized in that, include: The electric limiter as described in any one of claims 1-7.

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