An electrically folding trailer hitch device

Abstract

This application relates to the field of trailer hitch technology, specifically to an electric folding trailer hitch device, including a main component assembly, a trailer assembly, and a motor assembly. The main component assembly includes a base, a transmission disc, a driven disc, and a locking assembly. The base is fixedly mounted on the vehicle body, and the locking assembly is fixedly mounted between the driven disc and the base. A driven shaft is integrally provided on the driven disc, coaxially arranged with the driven disc, and passes through the base. One end of the transmission disc is engaged with the driven disc, and the other end is fixedly connected to the motor assembly. One end of the driven shaft passes through the base and is fixedly connected to the trailer assembly. The trailer assembly rotates synchronously with the driven shaft. The electric folding trailer hitch device facilitates the switching of the ball head hook between the retracted position and the working position via the motor assembly, and locks the ball head hook in the retracted or working position via the locking assembly, ensuring that the trailer hitch is locked in the working position and does not wobble, thereby improving the stability of the trailer hitch.

Description

Technical Field

[0001] This application relates to the field of trailer hitch technology, specifically to an electric folding trailer hitch device. Background Technology

[0002] Electric trailer hitches are a modern vehicle connection device that uses an electric drive mechanism to extend and retract the trailer hitch without requiring manual operation or reliance on a hydraulic system. This design not only improves the ease of operation but also increases the safety of use.

[0003] With the continuous changes in people's lifestyles, more and more people have higher demands for the towing performance of their vehicles. Adding an electric tow hook to a car, which is fixed to the rear bumper beam via a mounting bracket, and driven by a motor and gear transmission, generates circumferential rotation, causing the tow hook body to rotate between its initial and towing positions. This greatly improves the car's towing performance and allows for electric opening and closing, enhancing the convenience of use. However, during towing, if the tow hook body rotates or wobbles, the towed object can easily detach from it. Therefore, locking the electric tow hook at the towing position to prevent loosening during towing is crucial. For existing electric tow hooks, the self-locking force of the motor is insufficient to meet the locking requirements, and the tow hook is prone to wobbling during towing of heavy objects, affecting the stability of the electric folding tow hook. Summary of the Invention

[0004] To improve the stability of electric folding trailer hitches, this application provides an electric folding trailer hitch device.

[0005] The electric folding trailer hitch device provided in this application adopts the following technical solution: An electric folding trailer hitch device includes a main component assembly, a trailer assembly, and a motor assembly; The main component assembly includes a base, a transmission disk, a driven disk, and a locking assembly; The base is fixedly mounted on the vehicle body. A stepped groove is provided on one side wall of the base. A driven shaft is integrally provided on the driven disc. The driven shaft is coaxially arranged with the driven disc. The end face of the driven disc near the driven shaft abuts against the end face of the stepped groove. The driven shaft passes through the stepped groove and is rotatably connected to the base. One end of the transmission disc is engaged with the driven disc, and the other end is fixedly connected to the motor assembly. One end of the driven shaft passes through the stepped groove and is fixedly connected to the trailer assembly. The trailer assembly rotates synchronously with the driven shaft. A transmission boss is provided on the transmission disc. A transmission groove is coaxially provided on the driven disc. The transmission boss is inserted into the transmission groove, and the transmission boss can rotate freely at a certain angle along the transmission groove. The locking assembly is fixedly installed between the driven disk and the base. The locking assembly includes a locking caliper, a pin, a limiting pin, a fixing member, and a resetting member. The fixing member includes a limiting seat, which is fixedly installed on the side wall of the base near the transmission disk. A locking cavity is formed between the inner wall of the limiting seat and the side wall of the driven disk. The locking caliper is inserted into the locking cavity and slides along the locking cavity. One end of the pin is inserted into the locking caliper and is fixedly connected to the locking caliper. The other end of the pin is inserted into the resetting member and is slidably connected to the resetting member. One end of the limiting pin passes through the pin and the other end abuts against the side wall of the transmission disk. The resetting member is used to drive the locking caliper to lock the driven disk.

[0006] By adopting the above technical solution, the designed electric folding trailer hook device, when a car needs to tow a heavy load, first starts the motor assembly. The output end of the motor assembly drives the transmission disc to rotate, and the transmission boss rotates 60° in the transmission groove. The transmission disc abuts against the limit pin, driving the locking caliper to slide in the locking cavity. The locking caliper pushes the pin shaft to press the reset component, at which point the driven disc is unlocked. The transmission disc drives the driven disc to rotate synchronously, and the towing assembly fixedly connected to the driven shaft rotates accordingly. After the transmission disc rotates 180°, the towing assembly rotates to the working position. The reset component pushes the locking caliper deeper into the locking cavity, and the locking caliper presses against the side wall of the transmission disc, stopping the transmission disc from rotating, thus locking the towing assembly. Then, the towing assembly is loaded. After towing is completed, the load on the towing assembly is released, the motor assembly rotates in the reverse direction, and the transmission disc drives the driven disc to rotate in the reverse direction by 60°. At 0°, the transmission disc abuts against the limit pin, driving the locking caliper to slide within the locking cavity. The locking caliper pushes the pin shaft to press against the reset component, unlocking the driven disc. The transmission disc drives the driven disc to rotate synchronously, and the tow assembly fixedly connected to the driven shaft rotates accordingly. When the transmission disc rotates 180°, the electric folding trailer hook device rotates to the folded position. The reset component pushes the locking caliper deeper into the locking cavity, and the locking caliper presses against the side wall of the transmission disc, stopping the transmission disc from rotating and locking the tow assembly. The electric folding trailer hook device facilitates switching the tow assembly between the folded and working positions via the drive assembly, and locks the tow assembly in either the folded or working position via the locking assembly, ensuring that the tow assembly is locked and does not wobble when in the unfolded position, thus improving the stability of the electric folding trailer hook device.

[0007] In one specific implementation scheme, a drive track surface is integrally provided on the transmission disk. The drive track surface is arranged circumferentially along the side wall of the transmission disk. The drive track surface includes a horizontal segment and two inclined segments. One end of the inclined segment is flush with the side wall of the transmission disk, and the other end extends downward. The downward-extending ends of the two inclined segments are connected to the horizontal segment. The horizontal segment and the inclined segment are smoothly transitioned. The end of the limiting pin abuts against the drive track surface.

[0008] By adopting the above technical solution, the drive track surface is set, and the end of the limit pin abuts against the drive track surface. When the transmission disc rotates, the limit pin abuts against different positions on the drive track surface. The smooth transition between the horizontal and inclined sections facilitates the movement of the limit pin driven by the transmission disc. The limit pin drives the locking caliper to slide in the locking cavity, thereby facilitating the locking and unlocking of the trailer assembly and improving the stability of the electric folding trailer hook device.

[0009] In one specific implementation scheme, one end of the locking caliper abuts against the inner wall of the limiting seat, and the other end abuts against the driven plate. The driven plate is provided with a locking surface with an angle, and the locking caliper is provided with a locking mating surface with the same angle.

[0010] By adopting the above technical solution, the locking surface and the locking mating surface are set, and the locking caliper is pushed into the locking cavity by the reset component, so that the locking surface and the locking mating surface are in close contact, reducing the gap between the locking caliper and the driven plate, making it easier for the towing assembly to shake when the locking caliper and the driven plate are pressed together, thus improving the stability of the electric folding trailer hook device.

[0011] In one specific implementation, the reset component includes a spring seat and a spring. The spring is fixedly disposed in the inner cavity of the spring seat. The pin is inserted into the spring seat at one end away from the locking caliper and is slidably connected to the spring seat. A limiting step is coaxially provided on the side wall of the pin near the spring seat. The spring is coaxially wound around the pin and is disposed between the limiting step and the bottom wall of the spring seat.

[0012] By adopting the above technical solution, the reset component is designed such that one end of the spring abuts against the side wall of the limiting step, and the other end abuts against the bottom wall of the spring seat. When the towing assembly is in the retracted position, the end of the limiting pin abuts against the horizontal section, and the spring changes from a compressed state to a relaxed state. The spring generates a thrust on the limiting step, which pushes the pin to slide on the spring seat. The pin drives the locking caliper to penetrate into the locking cavity to lock the transmission disc, which facilitates the fixation of the position of the towing assembly.

[0013] In one specific implementation, the transmission groove includes an integrally formed arc-shaped portion and two fan-shaped portions, the two fan-shaped portions being symmetrically arranged at both ends of the arc-shaped portion, and the two fan-shaped portions communicating with the inner cavity of the arc-shaped portion; The transmission boss is located in the inner cavity of the sector-shaped part, and a rotational clearance is left between the transmission boss and the inner sidewall of the sector-shaped part.

[0014] By adopting the above technical solution, two fan-shaped parts are symmetrically arranged at both ends of the arc-shaped part, which helps to reduce the influence of unbalanced forces on the transmission groove during rotation and ensures the smooth rotation of the driven shaft. At the same time, the set rotation gap facilitates the transmission plate to drive the locking caliper to unlock when the transmission plate rotates 60°. At this time, the transmission boss rotates in the fan-shaped part while the transmission plate remains stationary, avoiding the force between the driven plate and the locking caliper, which could cause damage to the driven plate or the locking caliper.

[0015] In one specific implementation scheme, a limiting groove is formed on the bottom wall of the stepped groove. The limiting groove is set in a semi-circular arc shape with an arc of 180°. The center of the limiting groove coincides with the center of the driven shaft. A limiting boss is fixedly provided on the side wall of the driven shaft. When the driven disk rotates, the driven shaft rotates synchronously, and the limiting boss slides synchronously within the limiting groove following the driven shaft.

[0016] By adopting the above technical solution, the limiting boss slides within the limiting groove, which facilitates the limitation of the rotation range of the driven disc, ensuring that the driven disc maintains a stable motion trajectory during rotation. This helps prevent the driven disc from shifting or shaking due to vibration or external interference, thereby preventing the trailer assembly from shifting or shaking synchronously under the action of the driven disc, and improving the stability of the electric folding trailer hook. At the same time, the curvature of the limiting groove is set to 180°, which helps to ensure the rotation range of the driven disc and the transmission disc, so that the limiting pin always abuts against the drive track surface. This ensures that the drive track surface drives the limiting pin to move, thereby causing the pin shaft to drive the locking caliper to slide within the locking cavity, realizing the locking and unlocking of the transmission disc.

[0017] In one specific implementation, the motor assembly includes a mounting base, a bearing, and a motor body; the mounting base is fixedly connected to the base, the bearing is embedded in the middle of the mounting base, and the output shaft of the motor body passes through the bearing and is fixedly engaged with the transmission disc.

[0018] By adopting the above technical solution, the motor assembly is designed such that, by starting the motor body, the output shaft of the motor body can easily drive the transmission disc to rotate, thereby facilitating the reciprocating movement of the trailer assembly between the working position and the retracted position, and facilitating the fixing and unlocking of the trailer assembly.

[0019] In one specific implementation scheme, the motor assembly is provided with a bottom cover and a top cover plate from the inside to the outside. The bottom cover is fixedly connected to the fixed base, and the top cover plate is fixedly connected to the side wall of the bottom cover away from the fixed base. The motor body is disposed in the cavity between the bottom cover and the fixed base.

[0020] By adopting the above technical solution, the upper cover and bottom cover provide effective protection for the motor body, which helps to prevent external dust, moisture, debris and other contaminants from entering the motor assembly, thereby extending the service life of the motor assembly.

[0021] In one specific implementation, the trailer assembly includes an end cap, a nut, a ball head hook, and a diaphragm spring; the driven shaft passes through the stepped groove at one end and through the ball head hook, and the ball head hook rotates synchronously with the driven shaft, the ball head hook abutting against the base; the nut is threadedly connected to the driven shaft at one end passing through the ball head hook, the end cap is fixedly disposed at the end of the ball head hook away from the base, and the nut is located in the inner cavity between the end cap and the ball head hook; the diaphragm spring is disposed between the base and the ball head hook.

[0022] By adopting the above technical solution, the tow assembly is designed such that the ball head hook and the driven shaft rotate synchronously, which facilitates the switching of the ball head hook between the working position and the retracted position driven by the driven shaft; the nut and the driven shaft are threaded through one end of the ball head hook to limit the ball head hook and prevent it from disengaging from the driven shaft during operation; the end cap is fixedly set at the end of the ball head hook away from the base, providing effective protection for the tow assembly and helping to prevent external dust, moisture, debris and other contaminants from entering the interior of the tow assembly, thereby extending the service life of the tow assembly.

[0023] In one specific implementation, sealing rings are provided between the base and the bottom cover, between the base and the bottom cover, between the bottom cover and the top cover, between the base and the ball head hook, and between the ball head hook and the end cover.

[0024] By adopting the above technical solution, the sealing ring can effectively improve the sealing performance between the motor assembly and the base and between the trailer assembly and the base, ensuring the cleanliness and dryness of key internal components of the electric folding trailer hook device, thereby extending the service life of the electric folding trailer hook device.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The electric folding trailer hook device is equipped with a motor assembly that drives the transmission disc to rotate. The drive track surface on the transmission disc drives the limit pin to move when the transmission disc rotates, thereby pushing the locking caliper to slide in the locking cavity. The locking caliper separates from the driven disc, realizing the unlocking of the driven disc. The driven disc rotates synchronously with the transmission disc, and the trailer assembly rotates with the driven disc, which facilitates the switching of the electric folding trailer hook device between the working position and the folded position.

[0026] 2. The reset component is designed so that when the trailer assembly is in the retracted position, the end of the limit pin abuts against the horizontal section, the spring changes from a compressed state to a relaxed state, the spring generates a thrust on the step, pushing the pin to slide on the spring seat, and the pin drives the locking caliper to penetrate into the locking cavity to lock the transmission disc, which facilitates the fixation of the trailer assembly position and thus improves the stability of the electric folding trailer hook device. Attached Figure Description

[0027] Figure 1 This is an exploded view of an embodiment of an electric folding trailer hitch device.

[0028] Figure 2 This is a cross-sectional view of an embodiment of an electric folding trailer hitch device.

[0029] Figure 3 This is a schematic diagram of the main component assembly of an electric folding trailer hitch device according to an embodiment.

[0030] Figure 4 This is a cross-sectional view of the driven disc and the base of an electric folding trailer hook device according to an embodiment.

[0031] Figure 5 This is a schematic diagram of the locking caliper and driven disc of an electric folding trailer hitch device according to an embodiment.

[0032] Figure 6 This is a schematic diagram of the drive plate and driven plate of an electric folding trailer hook device according to an embodiment.

[0033] Figure 7 This is a cross-sectional view of the drive disc and driven disc of an electric folding trailer hook device according to an embodiment.

[0034] Figure 8 This is a schematic diagram of the locking caliper and driven disc of an electric folding trailer hook device according to an embodiment.

[0035] Figure Descriptions: 1. Main component assembly; 11. Base; 111. Step groove; 1111. Limiting groove; 12. Transmission disc; 121. Transmission boss; 122. Drive trajectory surface; 1221. Horizontal section; 1222. Inclined section; 13. Driven disc; 131. Transmission groove; 1311. Arc-shaped part; 1312. Fan-shaped part; 132. Locking surface; 14. Locking assembly; 141. Locking caliper; 1411. Locking mating surface; 142. Pin; 1421 1. Limiting step; 143. Limiting pin; 144. Fixing component; 1441. Limiting seat; 145. Reset component; 1451. Spring seat; 1452. Spring; 146. Locking cavity; 15. Driven shaft; 151. Limiting boss; 2. Trailer assembly; 21. End cover; 22. Nut; 23. Ball head hook; 24. Diaphragm spring; 3. Motor assembly; 31. Fixing seat; 32. Bearing; 33. Motor body; 34. Bottom cover; 35. Top cover plate; 4. Sealing ring. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0037] This application discloses an electric folding trailer hitch device.

[0038] Reference Figure 1 and Figure 2 An electric folding trailer hitch device includes a main component assembly 1, a trailer assembly 2, and a motor assembly 3. The main component assembly 3 is fixedly connected to the vehicle body, and the motor assembly 3 is located on one side of the main component assembly 3. The trailer assembly 2 is rotatably connected to the main component assembly 1, and the motor assembly 3 is used to drive the trailer assembly 2 to switch between the working position and the folded position.

[0039] Reference Figures 1-3 The main component assembly 1 includes a base 11, a transmission disc 12, a driven shaft 15, a driven disc 13, and a locking assembly 14. The base 11 is fixedly mounted on the vehicle body. A stepped groove 111 is provided on one side wall of the base 11. The driven disc 13 is embedded in the stepped groove 111 and can rotate within the stepped groove 111. The driven shaft 15 is integrally set with the driven disc 13, and the driven shaft 15 is coaxially set on the end face of the driven shaft 15. The driven shaft 15 passes through the middle of the base 11. The end of the driven disc 13 near the driven shaft 15 abuts against the bottom wall of the stepped groove 111.

[0040] Reference Figure 4The bottom wall of the stepped groove 111 is provided with a limiting groove 1111. The limiting groove 1111 is a 180° semi-circular arc, and the center of the limiting groove 1111 coincides with the center of the driven shaft 15. A limiting boss 151 is fixedly provided on the side wall of the driven shaft 15 near the driven plate 13. The limiting boss 151 is engaged in the limiting groove 1111. When the driven plate 13 rotates, the driven shaft 15 rotates synchronously with the driven plate 13. The limiting boss 151 slides back and forth in the limiting groove 1111 along with the driven shaft 15. The limiting groove 1111 controls the range of the rotation angle of the driven shaft 15 from 0° to 180°.

[0041] Reference Figure 5 The driven disk 13 has two inclined locking surfaces 132 symmetrically arranged on its side wall, and the distance between the two locking surfaces 132 gradually decreases from the end of the driven disk 13 closer to the driven shaft 15 to the end of the driven disk 13 farther away from the driven shaft 15.

[0042] Reference Figure 3 and Figure 6 The transmission disk 12 is integrally provided with a drive track surface 122 for driving the locking assembly 14. The drive track surface 122 is arranged circumferentially along the side wall of the transmission disk 12. The drive track surface 122 includes a horizontal segment 1221 and two inclined segments 1222. One end of the inclined segment 1222 is flush with the end face of the transmission disk 12, and the other end extends downward. The downward-extending ends of the two inclined segments 1222 are connected to the two ends of the horizontal segment 1221. The horizontal segment 1221 and the inclined segment 1222 are smoothly transitioned. The horizontal segment 1221 is parallel to the end face of the transmission disk 12.

[0043] Reference Figures 6-8 The driven disk 13 has a transmission groove 131 coaxially formed at the end away from the driven shaft 15. The end of the transmission disk 12 is integrally provided with a transmission boss 121, which is engaged in the transmission groove 131. The transmission groove 131 includes an integrally formed arc-shaped part 1311 and two fan-shaped parts 1312. The two fan-shaped parts 1312 are symmetrically arranged at both ends of the arc-shaped part 1311 and are connected to the inner cavity of the arc-shaped part 1311. The two ends of the transmission boss 121 are located in the inner cavity of the fan-shaped part 1312, and there is a rotation gap between the transmission boss 121 and the inner sidewall of the fan-shaped part 1312. The transmission boss 121 can rotate freely in the rotation gap between the fan-shaped part 1312 and the transmission boss 121, and the rotation angle range of the transmission boss 121 is 0° to 60°.

[0044] Reference Figures 1-3The locking assembly 14 includes a locking caliper 141, a pin 142, a limiting pin 143, a fixing member 144, and a resetting member 145. The fixing member 144 includes a limiting seat 1441, which is fixedly installed on the side wall of the base 11 near the transmission disc 12. A locking cavity 146 is formed between the inner wall of the limiting seat 1441 and the side wall of the driven disc 13. The locking caliper 141 is inserted into the locking cavity 146. Sliding grooves are provided on both sides of the inner wall of the limiting seat 1441, and the sliding grooves are set along the height direction of the inner wall of the limiting seat 1441. Sliding blocks that fit into the sliding grooves are integrally provided on both sides of the locking caliper 141. The sliding blocks slide in the sliding grooves. One end of the locking caliper 141 abuts against the inner wall of the limiting seat 1441, and the other end abuts against the side wall of the driven disc 13. The locking caliper 141 has a locking mating surface 1411 with the same slope as the locking surface 132. The locking surface 132 and the locking mating surface 1411 are in close contact, which reduces the gap between the driven plate 13 and the locking caliper 141. This helps to prevent the driven plate 13 from shaking when the locking caliper 141 is pressed against it, which would cause the towing assembly 2 to shake and affect the stability of the electric folding trailer hook. One end of the pin 142 is inserted into the locking caliper 141 and is fixedly connected to the locking caliper 141. The other end of the pin 142 is inserted into the reset member 145 and is slidably connected to the reset member 145. One end of the limiting pin 143 passes through the side wall of the pin 142 radially along the pin 142, and the other end abuts against the drive track surface 122.

[0045] Reference Figures 1-3 The reset component 145 includes a spring seat 1451 and a spring 1452. The spring 1452 is fixedly disposed in the inner cavity of the spring seat 1451. The end of the pin 142 away from the locking caliper 141 is inserted into the spring seat 1451 and is slidably connected to the spring seat 1451. A limiting step 1421 is coaxially disposed on the side wall of the pin 142 near the spring seat 1451. The spring 1452 is coaxially wound around the pin 142 and is disposed between the limiting step 1421 and the bottom wall of the spring seat 1451.

[0046] Reference Figures 1-3The motor assembly 3 includes a fixed base 31, a bearing 32, and a motor body 33. The fixed base 31 is fixedly connected to the side wall of the base 11 near the transmission disk 12. The bearing 32 is embedded in the middle of the fixed base 31 and coincides with the center of the driven disk 13. The end face of the transmission disk 12 away from the base 11 has a locking groove for connecting the output shaft of the motor body 33. The output shaft of the motor body 33 passes through the bearing 32 and is embedded in the locking groove. The transmission disk 12 and the output shaft of the motor body 33 rotate synchronously. The output shaft of the motor body 33 is rotatably connected to the bearing 32. The motor assembly 3 is provided with a bottom cover 34 and an upper cover plate 35 from the inside to the outside. The bottom cover 34 is fixedly connected to the fixed base 31. The upper cover plate 35 is fixedly connected to the side wall of the bottom cover 34 away from the fixed base 31. The motor body 33 is disposed in the cavity between the bottom cover 34 and the fixed base 31.

[0047] Reference Figure 1 and Figure 2 The tow assembly 2 includes an end cap 21, a nut 22, a ball head hook 23, and a diaphragm spring 24. One end of the driven shaft 15, passing through the stepped groove 111, passes through the ball head hook 23. The ball head hook 23 and the driven shaft 15 can be connected by a key, a gear ring meshing connection, or a shaft-hole mating connection. In this embodiment, the ball head hook 23 has an internal hexagonal hole, and the driven shaft 15 has an external hexagonal contour section that fits into the hexagonal hole. The external hexagonal contour section is tightly inserted into the internal hexagonal hole of the ball head hook 23, ensuring that the ball head hook 23 can rotate synchronously with the driven shaft 15. The nut 22 and the driven disc 13 are threaded through one end of the ball head hook 23, tightly abutting the ball head hook 23 against the side wall of the base 11, preventing the ball head hook 23 from falling off the drive shaft during operation. The end cap 21 is fixedly disposed on the side wall surface of the ball head hook 23 away from the base 11, preventing... Dust and debris entering the interior of the electric folding trailer hitch can affect its service life. A diaphragm spring 24 is fixedly abutted between the base 11 and the ball hook 23. When the ball hook 23 is impacted, the diaphragm spring 24 cushions the impact between the ball hook 23 and the base 11, preventing damage and improving the durability of the electric folding trailer hitch. Specifically, sealing rings 4 are provided between the base 11 and the bottom cover 34, between the bottom cover 34 and the top cover 35, between the base 11 and the ball hook 23, and between the ball hook 23 and the end cover 21. These seals improve the sealing performance between the motor assembly 3 and the base 11, and between the trailer assembly 2 and the base 11, ensuring the cleanliness and dryness of key internal components and extending the service life of the electric folding trailer hitch.

[0048] The implementation principle of the electric folding trailer hook device in this embodiment is as follows: In the initial state, the ball hook 23 is in the folded position. At this time, the locking caliper 141 is inserted into the locking cavity 146, and the locking caliper 141 presses against the side wall of the transmission plate 12. The end of the limiting pin 143 abuts against the horizontal section 1221 of the drive track surface 122. The spring 1452 is in the relaxed state, and the driven plate 13 is in the locked state. The ball hook 23 is fixed in the folded position and cannot rotate. When it is necessary to tow a heavy object, the motor assembly 3 is started first. The output end of the motor assembly 3 drives the transmission plate 12 to rotate. The transmission boss 121 rotates 60° in the transmission groove 131. The drive track surface on the transmission plate 12... The contact position between pin 122 and limit pin 143 changes from horizontal section 1221 to inclined section 1222. As the transmission disc 12 continues to rotate, when limit pin 143 abuts at the highest point of inclined section 1222, pin 142 slides into the inner cavity of spring seat 1451. Limit step 1421 on pin 142 pushes spring 1452 to contract in the inner cavity of spring seat 1451. When pin 142 moves, it drives locking caliper 141 to slide. When locking caliper 141 moves to the point where driven disc 13 disengages, it releases the unlocking of driven disc 13. Transmission disc 12 drives driven disc 13 to rotate synchronously, and ball head hook 23 fixedly connected to driven shaft 15 rotates accordingly. When the transmission disc 12 rotates 180°, the towing assembly 2 rotates to the working position. At this time, the end of the limit pin 143 abuts against the horizontal section 1221 of the drive track surface 122. Under the influence of the elastic force of the spring 1452, the pin shaft 142 presses the locking caliper 141 against the locking cavity 146. The locking surface 132 on the driven disc 13 and the locking mating surface 1411 on the locking caliper 141 are tightly fitted, and the driven disc 13 is in a locked state. The ball head hook 23 is fixed in the working position and cannot rotate. Then, a heavy object is hung on the ball head hook 23, and the car tows the heavy object. After the towing is completed, the load on the ball head hook 23 is released, and the motor assembly 3 rotates in the reverse direction. The transmission disc 12 drives the driven disc 13 to rotate 60° in the opposite direction. The transmission disc 12 abuts against the limit pin 143, driving the locking caliper 141 to slide in the locking cavity 146. The locking caliper 141 pushes the pin 142 to compress the spring 1452, thus unlocking the driven disc 13. The transmission disc 12 drives the driven disc 13 to rotate synchronously, and the tow assembly 2, which is fixedly connected to the driven shaft 15, rotates accordingly. When the transmission disc 12 rotates 180°, the ball head hook 23 rotates to the retracted position. The pin 142 pushes the locking caliper 141 to penetrate into the locking cavity 146. The locking caliper 141 presses against the side wall of the transmission disc 12, causing the transmission disc 12 to stop rotating, and thus locking the ball head hook 23.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electric folding trailer hitch device, characterized in that, It includes the main component assembly (1), the trailer assembly (2), and the motor assembly (3); The main component assembly (1) includes a base (11), a transmission disk (12), a driven disk (13), and a locking assembly (14); The base (11) is fixedly mounted on the vehicle body. A stepped groove (111) is provided on one side wall of the base (11). A driven shaft (15) is integrally provided on the driven disk (13). The driven shaft (15) is coaxially arranged with the driven disk (13). The end face of the driven disk (13) near the driven shaft (15) abuts against the end face of the stepped groove (111). The driven shaft (15) passes through the stepped groove (111) and is rotatably connected to the base (11). One end of the transmission disk (12) is engaged with the driven disk (13). The drive shaft (15) passes through the stepped groove (111) and is fixedly connected to the tow assembly (2) at one end. The tow assembly (2) rotates synchronously with the drive shaft (15). The drive disc (12) is provided with a drive boss (121). The drive disc (13) is coaxially provided with a drive groove (131). The drive boss (121) is inserted into the drive groove (131), and the drive boss (121) can rotate at a certain angle along the drive groove (131). The locking assembly (14) is fixedly installed between the driven disk (13) and the base (11). The locking assembly (14) includes a locking caliper (141), a pin (142), a limiting pin (143), a fixing member (144), and a resetting member (145). The fixing member (144) includes a limiting seat (1441), which is fixedly installed on the side wall of the base (11) near the transmission disk (12). A locking cavity (146) is formed between the inner wall of the limiting seat (1441) and the side wall of the driven disk (13). The locking caliper (141) is inserted into the locking cavity (146). 6) Inside, the locking caliper (141) slides along the locking cavity (146); one end of the pin (142) is inserted into the locking caliper (141), and the pin (142) is fixedly connected to the locking caliper (141), and the other end of the pin (142) is inserted into the reset member (145), and the pin (142) is slidably connected to the reset member (145); one end of the limiting pin (143) passes through the pin (142), and the other end abuts against the side wall of the transmission disk (12); the reset member (145) is used to drive the locking caliper (141) to lock the driven disk (13).

2. The electric folding trailer hitch device according to claim 1, characterized in that: A drive trajectory surface (122) is integrally provided on the transmission disk (12). The drive trajectory surface (122) is arranged circumferentially along the side wall of the transmission disk (12). The drive trajectory surface (122) includes a horizontal segment (1221) and two inclined segments (1222). One end of the inclined segment (1222) is flush with the side wall of the transmission disk (12), and the other end extends downward. The downward-extending ends of the two inclined segments (1222) are connected to the horizontal segment (1221). The horizontal segment (1221) and the inclined segment (1222) are smoothly transitioned. The end of the limiting pin (143) abuts against the drive trajectory surface (122).

3. The electric folding trailer hitch device according to claim 1, characterized in that: One end of the locking caliper (141) abuts against the inner wall of the limiting seat (1441), and the other end abuts against the driven plate (13). The driven plate (13) is provided with a locking surface (132) with an angle, and the locking caliper (141) is provided with a locking mating surface (1411) with the same angle.

4. The electric folding trailer hitch device according to claim 1, characterized in that: The reset component (145) includes a spring seat (1451) and a spring (1452). The spring (1452) is fixedly disposed in the inner cavity of the spring seat (1451). The pin (142) is inserted into the spring seat (1451) at one end away from the locking caliper (141). The pin (142) is slidably connected to the spring seat (1451). A limiting step (1421) is coaxially provided on the side wall of the pin (142) near the spring seat (1451). The spring (1452) is coaxially wound around the pin (142) and is disposed between the limiting step (1421) and the bottom wall of the spring seat (1451).

5. The electric folding trailer hitch device according to claim 1, characterized in that: The transmission groove (131) includes an integrally formed arc-shaped part (1311) and two fan-shaped parts (1312). The two fan-shaped parts (1312) are symmetrically arranged at both ends of the arc-shaped part (1311), and the two fan-shaped parts (1312) communicate with the inner cavity of the arc-shaped part (1311). The transmission boss (121) is located in the inner cavity of the sector (1312), and a rotation gap is left between the transmission boss (121) and the inner sidewall of the sector (1312).

6. The electric folding trailer hitch device according to claim 1, characterized in that: The bottom wall of the stepped groove (111) is provided with a limiting groove (1111). The limiting groove (1111) is set in a semi-circular arc shape, and the arc of the limiting groove (1111) is set to 180°. The center of the limiting groove (1111) coincides with the center of the driven shaft (15). The side wall of the driven shaft (15) is fixedly provided with a limiting boss (151). When the driven disk (13) rotates, the driven shaft (15) rotates synchronously, and the limiting boss (151) slides synchronously in the limiting groove (1111) along with the driven shaft (15).

7. The electric folding trailer hitch device according to claim 1, characterized in that: The motor assembly (3) includes a fixed base (31), a bearing (32) and a motor body (33); the fixed base (31) is fixedly connected to the base (11), the bearing (32) is embedded in the middle position of the fixed base (31), and the output shaft of the motor body (33) passes through the bearing (32) and is fixedly engaged with the transmission disk (12).

8. The electric folding trailer hitch device according to claim 7, characterized in that: The motor assembly (3) is provided with a bottom cover (34) and an upper cover plate (35) from the inside to the outside. The bottom cover (34) is fixedly connected to the fixed base (31), and the upper cover plate (35) is fixedly connected to the side wall of the bottom cover (34) away from the fixed base (31). The motor body (33) is disposed in the cavity between the bottom cover (34) and the fixed base (31).

9. The electric folding trailer hitch device according to claim 8, characterized in that: The trailer assembly (2) includes an end cap (21), a nut (22), a ball head hook (23), and a diaphragm spring (24); the driven shaft (15) passes through the stepped groove (111) and one end passes through the ball head hook (23), and the ball head hook (23) rotates synchronously with the driven shaft (15), and the ball head hook (23) abuts against the base (11); the nut (22) is threadedly connected to the driven shaft (15) through one end of the ball head hook (23), the end cap (21) is fixedly disposed at the end of the ball head hook (23) away from the base (11), and the nut (22) is located in the inner cavity between the end cap (21) and the ball head hook (23); the diaphragm spring (24) is disposed between the base (11) and the ball head hook (23).

10. An electric folding trailer hitch device according to any one of claims 9, characterized in that: A sealing ring (4) is provided between the base (11) and the bottom cover (34), between the bottom cover (34) and the top cover plate (35), between the base (11) and the ball head hook (23), and between the ball head hook (23) and the end cover (21).

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