CN220483014U - Electric trailer hook - Google Patents

Abstract

The utility model discloses an electric trailer hook, which belongs to the technical field of automobiles, and reduces acting force transmitted to a motor when a towing hook is loaded to protect the motor.

Description

Electric trailer hook

[ field of technology ]

The utility model relates to the technical field of automobiles, in particular to an electric trailer hook.

[ background Art ]

A trailer hook is an accessory arranged on a vehicle, is used for rescuing the vehicle, and can be used for dragging the vehicle to move when the vehicle is damaged and cannot be started. The existing trailer hook comprises a manual trailer hook and an electric trailer hook, wherein the manual trailer hook can be detached from the vehicle under the condition that the manual trailer hook is not needed to be used, the electric trailer hook is kept to be installed on the vehicle, and the rotation of the trailer hook can be controlled through a motor, so that the trailer hook can be switched between an unfolding position and a storage position. When the towing hook is used, a large load is born, so that acting force can be transmitted to the motor along a transmission path, and the internal structure of the motor is damaged.

[ utility model ]

The technical problem to be solved by the utility model is to provide the electric trailer hook for overcoming the defects in the prior art, so that the acting force transmitted to the motor when the trailer hook is loaded is reduced to protect the motor.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the electric trailer hook comprises a mounting frame, a towing hook, an actuating unit and a driving part, wherein a sleeve is arranged on the mounting frame, the towing hook is sleeved on the outer side of the sleeve, the actuating unit is arranged in the sleeve and is driven to rotate by the driving part, the driving part comprises a motor and a transmission part, the motor comprises an output shaft, the transmission part comprises a transmission shaft and a transmission disc, the transmission disc comprises a disc body, a first transmission push block and a second transmission push block are arranged on the disc body, one of the transmission shaft and the output shaft is provided with a first transmission projection, the other one is provided with a second transmission projection, the first transmission projection and one of the first transmission push blocks are arranged in pairs to form a first transmission groove, the other one is arranged in the first transmission groove and is in clearance fit with the inner wall of the first transmission groove when the towing hook is locked, so that the relative rotation is interrupted to the circumferential acting force transmitted to the motor when the towing hook bears a load, and the second transmission projection is in circumferential abutment with the second transmission push block and in clearance fit with the disc body.

On the basis of the scheme, the driving part further comprises a mounting plate for axially positioning the transmission part, and the motor and the transmission part are respectively arranged on two sides of the mounting plate.

On the basis of the scheme, the transmission part further comprises a bearing and a bearing mounting seat, the bearing mounting seat is mounted on the mounting frame, the outer ring of the bearing is abutted between the bearing mounting seat and the mounting plate, and the transmission disc is connected with the inner ring of the bearing.

On the basis of the scheme, the mounting plate is provided with the opening, the outer ring of the bearing is abutted to the mounting plate on the periphery of the opening, and the output shaft penetrates through the opening to be in transmission fit with the transmission disc.

On the basis of the scheme, the transmission disc is in clearance fit with the transmission shaft in the circumferential direction, and the output shaft is in clearance fit with the transmission disc in the axial direction.

On the basis of the scheme, when the towing hook rotates, the first transmission lug and the first transmission push block are in circumferential abutting joint to transmit torque, and when the towing hook stops rotating, the motor drives the transmission disc to rotate reversely to a position enabling the first transmission lug and the first transmission push block to be in circumferential clearance fit.

On the basis of the scheme, two ends of the first transmission groove in the radial direction are tapered towards the axis of the disc body.

On the basis of the scheme, the second transmission pushing blocks are arranged in pairs, and a second transmission groove matched with the second transmission convex block is formed between the two second transmission pushing blocks; or the second transmission convex blocks are arranged in pairs, and a second transmission groove matched with the first transmission push block is formed between the two second transmission convex blocks.

On the basis of the scheme, the mounting frame further comprises a sleeve, the towing hook is rotatably mounted on the sleeve, an elastic piece and a positioning part for axially positioning the sleeve are arranged on the sleeve, and the elastic piece is pressed between the positioning part and the towing hook.

On the basis of the scheme, the transmission shaft is in spline fit with the actuating unit.

The utility model has the beneficial effects that:

the electric trailer hook comprises a towing hook, a driving component and an actuating unit, wherein the driving component can generate torque, and the actuating unit can transmit the torque to the towing hook to drive the towing hook to rotate so as to unfold or store the towing hook. The driving part comprises a motor, a transmission disc and a transmission shaft, torque is generated by the motor, and the torque is transmitted step by step through the transmission disc and the transmission axial actuating unit. The first transmission lug can be propped against the first transmission push block in the circumferential direction to transmit torque, the second transmission lug can be propped against the second transmission push block in the circumferential direction to transmit torque, and the torque can be transmitted between the output shaft and the transmission disc and between the transmission shaft and the transmission disc without fixed connection, so that the assembly of the transmission part and the motor is facilitated.

The towing hook can bear great load in the use, can make the towing hook have the trend of rotation, axial displacement, and effort can be passed through actuating unit, drive unit and to the motor, because there is axial clearance fit between second transmission lug and the disk body, can eliminate the axial effort that passes to the motor through relative axial displacement's mode between the two, first transmission lug and first transmission ejector pad accessible are in the relative pivoted mode in circumference and are removed the circumference effort that passes to the motor.

Further, the driving part further comprises a mounting plate for axially positioning the transmission part, the motor and the transmission part are respectively arranged on two sides of the mounting plate, and the transmission plate is rotatably mounted on the mounting plate. The mounting plate can axially position the transmission component, so that the transmission component can be kept in a matched state in the axial direction, the transmission disc can rotate relative to the mounting plate to transmit the torque of the motor to the transmission shaft, and the transmission disc can be kept on the mounting plate, so that the axial impact force transmitted to the output shaft can be greatly reduced.

Further, the transmission part further comprises a bearing and a bearing mounting seat, the bearing mounting seat is mounted on the mounting frame, the outer ring of the bearing is abutted between the bearing mounting seat and the mounting plate, and the transmission disc is connected with the inner ring of the bearing. The bearing can ensure the stable rotation of the transmission disc, so that the transmission between the output shaft and the transmission disc and between the transmission disc and the transmission shaft is stable, and the outer ring of the bearing is abutted between the bearing mounting seat and the mounting plate, so that the axial direction and the radial direction of the bearing are both fixed, the transmission part can be radially limited, and the axial position of the transmission disc connected to the inner ring of the bearing is also fixed.

Further, an opening is formed in the mounting plate, the outer ring of the bearing is abutted to the mounting plate at the periphery of the opening, and the output shaft penetrates through the opening to be in transmission fit with the transmission disc. The motor that sets up the opening can make the motor that is located the mounting panel opposite side can pass through the output shaft and export the moment of torsion to the driving disk on, the inner circle of bearing is located the within range of trompil and can not contact the mounting panel and influence its rotation relative outer lane.

Further, when the towing hook rotates, the first transmission lug is in circumferential abutting connection with the first transmission push block to transmit torque, and when the towing hook stops rotating, the motor drives the transmission disc to rotate reversely to a position enabling the first transmission lug and the first transmission push block to be in circumferential clearance fit. In the transmission process, the first transmission lug and the first transmission push block are in circumferential butt joint to keep power transmission, after the towing hook stops rotating, if the towing hook still keeps circumferential butt joint, the towing hook can only have a buffering effect on circumferential acting force in one direction, and the first transmission lug and the first transmission push block can keep gaps in two directions by controlling the reverse rotation of the transmission disc through the motor.

Further, the mounting frame further comprises a sleeve, the towing hook is rotatably mounted on the sleeve, an elastic piece and a positioning portion for axially positioning the sleeve are arranged on the sleeve, and the elastic piece is pressed between the positioning portion and the towing hook. The positioning part can axially position the towing hook to keep the towing hook on the sleeve, the elastic piece can be pressed to generate elastic force acting on the towing hook and the positioning part so as to keep the towing hook stable, and the elastic piece can correspondingly deform to play a buffering role when the towing hook receives axial acting force.

Further, the transmission shaft is in spline fit with the actuating unit. Through spline fit, can make actuating unit can be along with the synchronous pivoted in-process relative transmission shaft axial displacement of transmission shaft, when the towing pintle receives axial effort, can reduce or eliminate the axial effort that transmits to the motor direction through the mode of relative movement between transmission shaft and the actuating unit.

These features and advantages of the present utility model will be disclosed in detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The utility model is further described with reference to the accompanying drawings:

FIG. 1 is a schematic illustration of the connection of an electric trailer hook to a vehicle in an embodiment of the present utility model;

FIG. 2 is a schematic view of an electric trailer hook according to an embodiment of the present utility model;

FIG. 3 is an exploded view of an electric trailer hitch in an embodiment of the present utility model;

FIG. 4 is a front view of an electric trailer hitch in accordance with an embodiment of the present utility model;

FIG. 5 is a cross-sectional view taken at A-A of FIG. 4;

FIG. 6 is a cross-sectional view at B-B in FIG. 4;

FIG. 7 is an enlarged schematic view of FIG. 5 at C;

FIG. 8 is a schematic view of an electric trailer hook when the stop rotary member is in an unlocked position according to an embodiment of the present utility model;

FIG. 9 is a schematic diagram illustrating the cooperation between the first actuating member and the rotation stopping member according to an embodiment of the present utility model;

FIG. 10 is a schematic view of a first actuator in a first embodiment with a circumferential surface tiled;

FIG. 11 is a schematic view of an actuator unit according to an embodiment of the present utility model;

FIG. 12 is a schematic view of an end cap according to an embodiment of the present utility model;

FIG. 13 is a schematic view of a driving unit according to an embodiment of the present utility model;

FIG. 14 is a cross-sectional view taken at D-D of FIG. 13;

fig. 15 is a schematic structural diagram of a transmission component in an embodiment of the present utility model.

Reference numerals:

the device comprises a mounting frame 100, a sleeve 110, a through hole 111, a first transmission member 120 and a positioning part 130;

towing hook 200, drive protrusion 210, positioning groove 220, body 230, sealing groove 231, end cover 240, connecting shaft 250, locking surface 251;

the actuating unit 300, the first actuating member 310, the guide portion 311, the first locking portion 3111, the second locking portion 3112, the unlocking portion 3113, the assembly cavity 312, the second actuating member 320, the guide unit 321, the first helical guide segment 3211, the transmission portion 3212, the second helical guide segment 3213, the transmission groove 322, the second transmission member 330, the first locking segment 331, the second locking segment 332, the transmission segment 333;

a rotation stopper 400;

a cavity 500, an assembly gap 510;

a first seal 600, a second seal 610, a seal ring 611, a seal lip 612, an elastic member 620;

The housing 700, the motor 710, the output shaft 711, the second driving projection 7111, the driving part 720, the driving shaft 721, the first driving projection 7211, the driving disk 722, the disk 7221, the first driving push block 7222, the second driving push block 7223, the mounting plate 730, the opening 731, the bearing 740, the outer ring 741, the inner ring 742, the bearing mount 750, the first driving groove 760, the sector area 761, the second driving groove 770;

mounting post 800, first fitting portion 810, second fitting portion 820, first fitting hole 820, first stepped portion 830, second fitting hole 840, fastener 850, first thread 860, second thread 870.

[ detailed description ] of the utility model

The technical solutions of the embodiments of the present utility model will be explained and illustrated below with reference to the drawings of the embodiments of the present utility model, but the following embodiments are only preferred embodiments of the present utility model, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present utility model.

The appearances of the phrases such as "exemplary," "some embodiments," and the like in the following text are meant to be "serving as examples, embodiments, or illustrative," and any embodiment described as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, it will be appreciated by those skilled in the art that the present disclosure may be practiced without some of these specific details.

Referring to fig. 1 to 15, the embodiment of the application discloses an electric trailer hook, which comprises a mounting frame 100, a towing hook 200, an actuating unit 300 and a driving component, wherein the mounting frame 100 is mounted on a vehicle, the towing hook 200, the actuating unit 300 and the driving component are all mounted on the mounting frame 100, the driving component can generate torque and transmit the torque to the actuating unit 300, and the actuating unit 300 drives the towing hook 200 to switch from a storage position to a unfolding position.

A rotation stopping member 400 is further disposed between the actuating unit 300 and the towing hook 200, and the rotation stopping member 400 can lock the towing hook 200 when the towing hook 200 is located at the storage position or the unfolding position to limit the rotation of the towing hook 200, so as to avoid the unexpected action of the towing hook 200 when being stored or the influence of rotation when being used. The rotation stopping member 400 is driven by the actuating unit 300 to be switched between a locking position and an unlocking position, the rotation stopping member 400 can lock the towing hook 200 when in the locking position, and the rotation stopping member 400 can unlock the towing hook 200 when in the unlocking position so as to allow the towing hook 200 to be driven to rotate by the actuating unit 300.

The actuating unit 300 includes a first actuating member 310 and a second actuating member 320, the torque output by the driving component can drive the first actuating member 310 and the second actuating member 320 to rotate at the same time, the first actuating member 310 can drive the rotation stopping member 400 to act under the action of the torque to switch between a locking position and an unlocking position, the second actuating member 320 can generate axial displacement under the action of the torque while rotating to switch between a transmission position and an idle position, when the second actuating member 320 is in the transmission position, the torque on the second actuating member 320 can be transmitted to the towing hook 200 to drive the towing hook 200 to rotate synchronously, and when the second actuating member 320 is in the idle position, the torque of the second actuating member 320 cannot be transmitted to the towing hook 200 to idle relative to the towing hook 200.

When the towing hook 200 is operated, the towing hook 200 is switched from the storage position to the use position or from the use position to the storage position, the towing hook 200 needs to be locked when both the storage position and the use position are needed, the towing hook 200 is switched from the storage position to the use position or from the use position to the storage position, the rotation stopping member 400 is switched from the locking position to the unlocking position and then from the unlocking position to the locking position, and the second actuating member 320 is switched from the idle position to the transmission position and then from the transmission position to the idle position. When the first actuating member 310 rotates, the second actuating member 320 is also in a rotating state, and the position change of the rotation stopping member 400 is matched with the position change of the second actuating member 320, that is, when the rotation stopping member 400 is switched to the locking position, the second actuating member 320 is synchronously switched to the idle position, and when the rotation stopping member 400 is switched to the unlocking position, the second actuating member 320 is synchronously switched to the transmission position, so that the mutual interference of the motion of the rotation stopping member 400 and the motion of the second actuating member 320 is avoided.

The towing hook 200 includes a transmission protrusion 210, the second actuating member 320 includes a guide unit 321, when the rotation stopping member 400 is in a locked position, the second actuating member 320 is in an idle position to enable the transmission protrusion 210 and the guide unit 321 to slide relatively and rotate relatively, when the rotation stopping member 400 is in an unlocked position, the second actuating member 320 is in a transmission position to enable the transmission protrusion 210 and the guide unit 321 to slide relatively and rotate synchronously, when the second actuating member moves axially, the second actuating member can move relatively to the towing hook 200 to enable the guide unit 321 and the transmission protrusion 210 to slide relatively, when the second actuating member 320 moves to the transmission position, the guide unit 321 can be matched with the transmission protrusion 210 to transmit torque to the towing hook 200, and when the second actuating member 320 is in the idle position, the guide unit 321 and the transmission protrusion 210 are out of engagement axially and cannot transmit torque. Of course, the transmission projection may also be provided on the second actuating member, and the guide unit on the towing hook.

In the prior art, in order to unlock the towing hook, lock the towing hook and rotate the towing hook respectively, the power of a motor is transmitted by two sets of transmission mechanisms respectively, one set of transmission mechanism is used for unlocking and locking the towing hook, the other set of transmission mechanism is used for driving the towing hook to rotate when the towing hook is unlocked, and a planetary gear is needed for one set of transmission mechanism. Compared with the prior art, in the application, the second actuating element 320 can keep rotating under the action of the torque output by the driving component, and the torque on the second actuating element 320 can be intermittently transmitted to the towing hook 200 by adjusting the relative position between the second actuating element 320 and the towing hook 200 in the axial displacement mode in the rotating process, so that the structure of the electric trailer hook is simplified.

The first actuator 310 is provided with a guide portion 311, and the guide portion 311 can switch the position of the rotation stopper 400 during rotation along with the first actuator 310, so that the rotation stopper 400 can be switched between a locking position and an unlocking position.

The first actuator 310 and the second actuator 320 are in driving engagement with each other to transmit torque to the second actuator 320, so that the first actuator 310 and the second actuator 320 can rotate synchronously or with a constant transmission ratio, so that the second actuator 320 and the rotation stopping member 400 can keep synchronous action, and the switching time of the rotation stopping member 400 in the locking position and the unlocking position is matched with the switching time of the second actuator 320 in the idle position and the transmission position. In addition, no additional transmission structure is required between the driving member and the second actuator 320 to transfer torque to the second actuator 320.

Referring to fig. 5 to 11, in one embodiment of the present utility model, as preferable, one end of the first actuator 310 is in driving engagement with the driving part, the other end of the first actuator 310 has a fitting cavity 312, and at least part of the second actuator 320 is fitted into the fitting cavity 312 so that the first actuator 310 can transmit torque to the second actuator 320, so that the axial dimension of the actuating unit 300 can be shortened.

In addition, one end of the first actuating element can be directly connected with the second actuating element to ensure that power transmission is kept between the first actuating element and the second actuating element, for example, assembly modes such as welding, screw connection and the like are adopted, and the radial dimension of the first actuating element and the radial dimension of the second actuating element can be prevented from being excessively large through the design.

Referring to fig. 5 to 11, in one embodiment of the present utility model, as is preferable, the first actuator 310 and the second actuator 320 are relatively fixed, and the first actuator 310 is axially displaced during rotation to push the second actuator 320 to switch between the transmission position and the idle position. There is a spline fit between the first actuator 310 and the transmission member 720 such that the first actuator 310 can be axially moved while being driven in rotation by the transmission member 720.

A sleeve 110 is arranged between the towing hook 200 and the actuating unit 300, the sleeve 110 is connected to the mounting frame 100 and can keep relative fixation with the mounting frame 100, the towing hook 200 is rotatably mounted on the sleeve 110, a first transmission member 120 is arranged on the sleeve 110, a second transmission member 330 is arranged on the first actuating member 310, the second transmission member 330 can rotate relative to the first transmission member 120 when the first actuating member 310 rotates, and the first transmission member 120 is in transmission fit with the second transmission member 330 to convert the rotary motion of the second transmission member 330 into the axial displacement of the first actuating member 310.

Of course, the first transmission member may also be disposed on the second actuating member, so as to drag the first actuating member to displace synchronously when the second actuating member moves axially.

In addition, the second actuating piece can also stretch and retract relative to the first actuating piece, the position of the first actuating piece in the axial direction is unchanged, the second actuating piece is in spline fit with the first actuating piece and can axially move relative to the first actuating piece while rotating, and the second transmission piece is arranged on the second actuating piece.

Referring to fig. 5 to 11, in an embodiment of the present utility model, the first transmission member 120 is a slider, the second transmission member 330 is a spiral groove, the slider is inserted into the spiral groove, and when the first transmission member 120 rotates, the slider and the spiral groove rotate relatively, and the slider can slide relatively along the spiral groove, so that the second transmission member 330 can move axially while rotating continuously under the driving of the first transmission member 120 in the axial direction during the rotation relative to the spiral groove.

The spiral groove includes a first locking section 331, a second locking section 332, and a transmission section 333 connected therebetween, and the first locking section 331, the transmission section 333, and the second locking section 332 are disposed along an axial direction of the first actuator 310 so that the slider can sequentially pass through the first locking section 331, the transmission section 333, and the second locking section 332, thereby sequentially subjecting the tow hook 200 to three processes of locking, rotating, and locking. When the slider is in the first locking section 331 or the second locking section 332, the second actuator 320 is in the idle position, the rotation stopper 400 is in the locked position, and when the slider is in the transmitting section 333, the second actuator 320 is in the transmitting position, and the rotation stopper 400 is in the unlocked position.

The helix angle of the transmission section 333 (as shown in fig. 6, fig. 6 is a schematic diagram of the outer peripheral surface of the first actuating element after being tiled, the helix angle is an included angle θ) is related to the axial displacement speed of the second actuating element 320, and under the condition that the rotation speed of the second actuating element 320 is unchanged and the transmission section 333 with the same length has the same rotation speed, the larger the helix angle is, the faster the axial displacement speed of the second actuating element 320 is, so that the rotation angle of the second actuating element 320 at the transmission position can be adjusted by designing the helix angle, and the rotation angle of the towing hook 200 is adjusted under the condition that other structures do not need to be changed, so that the adaptability of the electric trailer hook of the application and the adaptation difficulty of the application on different vehicle types are improved. Exemplary: when the helix angle is θ1, the second actuator rotates 150 ° to disengage the driving protrusion 210 and the guide unit 321, and when the helix angle is θ2, θ2 < θ1, the second actuator needs to rotate 180 ° to disengage the driving protrusion 210 and the guide unit 321. In addition, the length of the transmission section can be adjusted to adjust the rotation angle of the towing hook under the condition that the screw angle is unchanged.

In adjusting the lead angle, the length of the transmission section 333 and the length of the guide unit 321 that can be engaged with the transmission protrusion 210 need to be designed, but the overall size of the first actuator 310, the overall size of the second actuator 320, the size of the tow hook 200, the size of the driving member, and the like need not be adjusted.

To improve the stability of the transmission, two opposite sliders are provided on the sleeve 110, and two spiral grooves are provided on the second actuating member 320, which are spaced apart to be respectively engaged with one slider.

Of course, it will be appreciated that the arrangement of the helical groove on the inner wall of the sleeve and the slider on the first actuating member also enables the solution described above to be implemented, with the same technical effects.

Referring to fig. 5 to 9, in one embodiment of the present utility model, based on the above-described embodiment, the guide part 311 includes a first locking part 3111, a second locking part 3112, and an unlocking part 3113 connected therebetween, the first locking part 3111 and the second locking part 3112 being for holding the guide part 311 in the locked position, and the unlocking part 3113 being for holding the guide part 311 in the unlocked position.

Since the first actuator 310 has axial displacement during rotation, the first locking portion 3111, the unlocking portion 3113 and the second locking portion 3112 are sequentially disposed along the axial direction of the first actuator 310, so that the rotation stopper 400 can sequentially pass through the first locking portion 3111, the unlocking portion 3113 and the second locking portion 3112 during rotation of the first actuator 310, and the rotation stopper 400 is switched from the locking position to the unlocking position and then from the unlocking position to the locking position. When the rotation stopper 400 is located at the locking position, the first locking portion 3111 or the second locking portion 3112 can move axially relative to the rotation stopper 400 during rotation of the first actuator 310, and the rotation stopper 400 cannot be switched from the locking position to the unlocking position until the unlocking portion 3113 moves to cooperate with the rotation stopper 400. The position of the guide portion 311 relative to the rotation stopping member 400 may be changed along with the rotation of the first actuating member 310, so as to switch the position of the rotation stopping member 400, and no additional transmission structure is required between the first actuating member 310 and the rotation stopping member 400 to control the movement of the rotation stopping member 400.

If the first actuating member is in spline fit with the second actuating member, the first actuating member is kept fixed in the axial direction, and the first locking portion, the unlocking portion and the second locking portion are sequentially arranged along the circumferential direction of the first actuating member.

Referring to fig. 5 to 9, according to the above embodiment, in one embodiment of the present utility model, the sleeve 110 is provided with the through hole 111 for the rotation stopper 400 to extend and retract, the guide portion 311 can guide the rotation stopper 400 to extend and retract with respect to the through hole 111, the tow hook 200 is provided with the positioning groove 220, and the rotation stopper 400 is positioned in the through hole 111 and inserted into the positioning groove 220 and abuts against the side wall of the positioning groove 220 when in the locked position, and the rotation stopper 400 can restrict the rotation of the tow hook 200 when abutting against the side wall of the positioning groove 220 because the through hole 111 has a positioning function on the rotation stopper 400.

In this application, the side portion of the first actuating element 310 is recessed in the radial direction to form a guiding portion 311, the rotation stopping element 400 retracts into the sleeve 110 to switch to the unlocking position, and a recessed area is formed between the recessed guiding portion 311 and the inner wall of the sleeve 110, so that the rotation stopping element 400 retracts into the sleeve 110 into the recessed area, and the rotation stopping element 400 does not abut against the side wall of the positioning slot 220 any more and releases the locking of the towing hook.

The first locking portion 3111, the unlocking portion 3113 and the second locking portion 3112 are three planes of the guide portion 311, respectively, wherein the unlocking portion 3113 is a plane disposed along an axial direction of the first actuator 310, the first locking portion 3111 and the second locking portion 3112 are two inclined planes connecting the unlocking portion 3113 and an outer periphery of the first actuator 310, respectively, the first locking portion 3111 and the second locking portion 3112 can gradually guide the rotation stopper 400 to be separated from the positioning groove 220 during rotation of the first actuator 310, and the unlocking portion 3113 can hold the rotation stopper 400 at a current position while avoiding a position change of the rotation stopper 400 in the axial direction of the through hole 111. As shown in fig. 9, the rotation stopping member denoted by a is in a locking position, the rotation stopping member denoted by b moves to an unlocking position along the first locking portion, the rotation stopping member denoted by c still moves to an unlocking position along the unlocking portion, and the rotation stopping member denoted by d moves to a locking position along the second locking portion. When the rotation stopping piece moves from the position a to the position b, the rotation stopping piece is in a locking position; when the rotation stopping piece moves from the position b to the position c, the rotation stopping piece is positioned at the unlocking position; the rotation stopping members are in the locking positions during the movement from the c position to the d position.

The rotation stopping members 400 are spheres, at least three rotation stopping members 400 are uniformly arranged around the first positioning member, the rotation stopping member 400 above can gradually retract into the sleeve 110 under the action of self gravity along with the rotation of the first actuating member 310, and the rotation stopping member 400 below can push the rotation stopping member 400 to retract into the sleeve 110 when the second actuating member 320 is switched to the transmission position to drive the towing hook 200 to rotate. Correspondingly, the tow hook 200 is uniformly provided with at least three positioning grooves 220 which are arranged at intervals, and the interval angle between two adjacent positioning grooves 220 is the same as the interval angle between two adjacent rotation stopping pieces 400.

Referring to fig. 5 to 11, in one embodiment of the present utility model, the guide unit 321 includes a first spiral guide section 3211, a transmission portion 3212, and a second spiral guide section 3213 disposed along an axial direction of the second actuator 320, the first spiral guide section 3211 and the second spiral guide section 3213 being in a spiral shape around an axis of the second actuator 320 in an axial direction, the transmission portion 3212 being a plane disposed along the axial direction of the second actuator 320.

During the axial movement of the second actuator 320, the guide unit 321 and the driving protrusion 210 have relative positional changes in the axial direction, so that the driving protrusion 210 may sequentially pass through the first spiral guide segment 3211, the driving portion 3212, and the second spiral guide segment 3213, and when the driving protrusion 210 passes through the driving portion 3212, the two abut in the circumferential direction to transmit torque, and the tow hook 200 and the second actuator 320 may synchronously rotate until the axial displacement of the second actuator 320 axially separates the driving protrusion 210 from the driving portion 3212.

When the transmission protrusion 210 is matched with the first spiral guide section 3211 or the second spiral guide section 3213 in a spiral shape, the transmission protrusion 210 can slide along the first spiral guide section 3211 or the second spiral guide section 3213, so that torque is prevented from being transmitted to the towing hook 200.

Referring to fig. 5 to 11, in one embodiment of the present utility model, the second actuator 320 is a bush member, both ends in the circumferential direction of the bush member are provided with guide units 321, the guide units 321 are faces on the bush member, the first spiral guide segment 3211 and the second spiral guide segment 3213 are spiral faces, the transmission portion 3212 is a straight face, one of the guide units 321 may be engaged with the transmission protrusion 210 when the second actuator 320 rotates in the first direction, and the other guide unit 321 may be engaged with the transmission protrusion 210 when the second actuator 320 rotates in the second reverse direction opposite to the first direction.

The second actuating member 320 includes two bearing members arranged in pairs, the bearing members are arranged in a central symmetry manner, guide grooves 322 for adapting to the driving protrusions 210 are formed between the opposite guide units 321 of the two bearing members, the driving protrusions 210 are pins and can simultaneously extend into the two guide grooves 322, one of the guide units 321 in the same guide groove 322 can be matched with the driving protrusions 210 when the second actuating member 320 rotates in a first direction, the other guide unit 321 can be matched with the driving protrusions 210 when the second actuating member 320 rotates in a second opposite direction, the two bearing members can be arranged to enable the driving to be more stable, and guide grooves 322 matched with the driving protrusions 210 can be formed between the two guide units 321 for pre-positioning the second actuating member 320 and the towing hook 200 relative to each other when the second actuating member 320 is assembled.

Two bushing members are mounted on the inner wall of the mounting cavity 312 and screw holes may be provided in the first actuating member 310 to lock the bushing members in the mounting cavity 312 by means of screws. Although the guide groove 322 may be directly formed at the inner wall of the fitting chamber 312, such design is extremely high in machining requirements and machining accuracy to be difficult to implement, so that forming the guide unit 321 by the bush member is a preferred embodiment.

Referring to fig. 2, 5 to 8 and 12, in one embodiment of the present utility model, the towing hook 200 includes a body 230 and an end cap 240, the body 230 is rotatably mounted on the sleeve 110, the end cap 240 is located on the front side of the sleeve 110 and forms a cavity 500 with the sleeve 110 to avoid the second actuating member 320, the end cap 240 is provided with a connection shaft 250 extending into the cavity 500, the transmission protrusion 210 is provided on the connection shaft 250, and the connection shaft 250 extends into the assembly cavity 312 to be in transmission engagement with the second actuating member 320.

The end cover 240 can shield the sleeve 110 and the actuating unit 300, and can block dust and liquid, and the cavity 500 formed between the end cover 240 and the sleeve 110 can avoid the second actuating member 320, so that the axial displacement of the second actuating member 320 is prevented from being blocked.

The end of the connecting shaft 250 connected with the end cover 240 is provided with a locking surface 251 for limiting the relative rotation between the connecting shaft 250 and the end cover 240, and the rotation of the connecting shaft 250 relative to the end cover 240 is limited under the action of the locking surface 251, so that the end cover 240 and the body 230 can be driven to rotate together in the process of bearing the transmission torque.

The end of the sleeve 110 far away from the mounting frame 100 is provided with a positioning part 130 for axially positioning the towing hook 200, and the positioning part 130 can axially position the towing hook 200 to limit the towing hook 200 on the sleeve 110 so as to avoid the towing hook 200 from being separated from the sleeve 110 in the rotating process.

Referring to fig. 3 and 5, in one embodiment of the present utility model, a first sealing member 600 is provided between the positioning portion 130 and the body 230, a second sealing member 610 is provided between the body 230 and the mounting frame 100, and an elastic member 620 is provided between at least one of the positioning portion 130 and the body 230, and between the body 230 and the mounting frame 100 to press the body 230. The elastic member 620 can play a role in buffering when the tow hook 200 receives an axial force, and the first sealing member 600 and the second sealing member 610 can respectively seal both ends of the tow hook 200 to prevent dust, liquid, etc. from entering between the tow hook 200 and the sleeve 110 or between the sleeve 110 and the actuating unit 300, so that the internal structure is protected from being polluted and disturbed by external factors.

The body 230 is provided with a sealing groove 231 adapted to the first sealing member 600 on a side facing the end cover 240, the first sealing member 600 is pressed between the end cover 240 and the body 230, the second sealing member 610 is pressed between the body 230 and the mounting frame 100, the sealing groove 231 has a positioning function on the first sealing member 600, the first sealing member 600 can be prevented from being separated from the body 230 in the radial direction, the end cover 240 and the body 230 are matched with each other, the pressing state of the first sealing member 600 can be kept to keep sealing between the end cover 240 and the body 230, the position of the towing hook 200 in the axial direction can be kept fixed under the action of the positioning part 130, so that the pressing state of the second sealing member 610 can be maintained to provide sealing between the body 230 and the mounting frame 100.

The second sealing member 610 includes a sealing ring 611 and a sealing lip 612 that diverges outward from the periphery of the sealing ring 611, the sealing ring 611 is sleeved on the body 230, and the sealing lip 612 abuts against the mounting frame 100. The sealing ring 611 is sleeved on the body 230, so that the second sealing member 610 can be positioned in the radial direction, the sealing lip 612 protrudes from the periphery of the sealing ring 611 and can be abutted against the mounting frame 100, and the sealing between the body 230 and the mounting frame 100 can be maintained when the towing hook 200 generates axial displacement.

The positioning portion 130 is disposed in the cavity 500 and keeps a distance from the end cap 240, and the elastic member 620 is installed between the positioning portion 130 and the body 230, so that the installation of the elastic member 620 does not affect the assembly of the end cap 240 and the body 230, and the elastic force of the elastic member 620 is applied to the body 230, so that the compression degree of the second sealing member 610 can be improved, and the sealing performance between the body 230 and the mounting frame 100 can be improved. Since the end cap 240 is assembled with the body 230, the distance therebetween does not change to affect the sealing performance of the first sealing member 600, and the elastic member 620 has an elastic force acting on the body 230 and directed toward the second sealing member 610, so that the second sealing member 610 is maintained in a compressed state to maintain the sealing between the body 230 and the mounting frame 100 during the rotation of the towing hook.

Referring to fig. 3 and 5, in one embodiment of the present utility model, the positioning part 130 is screw-engaged with the socket 110, the position of the positioning part 130 in the axial direction of the socket 110 can be maintained stable by screw-engagement to maintain the axial positioning effect on the tow hook 200, and the position of the positioning part 130 on the socket 110 can also be adjusted by screw-engagement, and the elastic member 620 has a deformation amount, so that the pressure applied to the tow hook 200 can be maintained to buffer the axial shaking of the tow hook 200 when the positioning part 130 is located at different positions on the socket 110.

Based on the above embodiments, in one embodiment of the present utility model, the elastic member is a silicone gasket or a rubber gasket or a wavy elastic gasket. The silica gel or rubber has deformation capability, and can generate elastic force after being pressed, and the wavy elastic washer can be flattened after being pressed in the axial direction, so that the elastic force in the axial direction can be generated to restore the wavy state. When the elastic member is a wave-shaped elastic washer, a metal material may be used.

Referring to fig. 5 to 8 and 13, in one embodiment of the present utility model, based on the above-described embodiment, the driving part includes a housing 700, a motor 710, and a transmission part 720 in driving engagement with the motor 710 to transmit torque of the motor 710 to the actuating unit 300, the tow hook 200 and the driving part are respectively assembled to both sides of the mounting bracket 100, the housing 700 is provided with a mounting plate 730 for axially positioning the transmission part 720, a mounting post 800 is provided between the mounting plate 730 and the mounting bracket 100, one end of the mounting post 800 is a first assembly part 810 assembled with the mounting bracket 100, the other end of the mounting post 800 is a second assembly part 820 assembled with the housing 700, and the mounting post 800 is supported therebetween to form an assembly gap 510.

The mounting plate 730 is used to axially position the drive member 720 so that the drive member 720 can remain in driving engagement with the motor 710 and the tow hook 200, avoiding interruption of power transmission between the motor 710 and the tow hook 200 by the drive member 720 due to positional changes. The mounting plate 730 and the mounting frame 100 are assembled through the mounting column 800, and after the mounting column 800 is respectively connected with the mounting plate 730 and the mounting frame 100, a constant interval can be formed between the mounting plate 730 and the mounting frame 100 to form the assembly gap 510, and the assembly difficulty between the driving part and the mounting frame 100 is reduced because the size of the assembly gap 510 can be kept unchanged, so that the assembly of the driving part 720 can be facilitated. And the mounting column 800 is of an independent structure and is not directly formed on the mounting frame 100 or the mounting plate 730, so that the increase of the production difficulty of the mounting frame 100 or the mounting plate 730 is avoided, and the size of the mounting column 800 can be selected according to the size of the transmission part 720 and other factors, so that the size of the assembly gap 510 meets the requirement of mounting the transmission part 720, and the mounting plate 730 or the mounting frame 100 can be omitted.

Referring to fig. 6, in one embodiment of the present utility model, based on the above-described embodiment, the mounting bracket 100 includes the first fitting hole 820, the first fitting portion 810 is fitted into the first fitting hole 820, and the first stepped portion 830 abutting the mounting bracket 100 is formed between the first fitting portion 810 and the side portion of the mounting post 800. The difficulty of providing the first fitting hole 820 on the mounting bracket 100 is less than the difficulty of providing the protruding structure on the mounting bracket 100, which can be engaged with the first fitting portion 810, so that the manufacturing process of the mounting bracket 100 is facilitated. The first fitting portion 810 may be fitted into the first fitting hole 820 such that the first stepped portion 830 abuts the mounting bracket 100 around the first fitting hole 820 to improve the stability of the mounting post 800 and the mounting plate 730 in the axial direction of the mounting post 800.

The second fitting part 820 abuts the mounting plate 730 and has a second fitting hole 840, and the fastener 850 passes through the mounting plate 730 and is locked into the second fitting hole 840 to fix the mounting plate 730 with the mounting post 800, and both ends of the mounting post 800 abut the mounting plate 730 and the mounting bracket 100, respectively, thereby restricting displacement of the mounting post 800 in the axial direction to secure stability of the mounting gap. Since the fastener 850 is locked into the second fitting hole 840 through the mounting plate 730 during the assembly process, the second fitting part 820 does not protrude from the mounting plate 730.

Optionally, the housing, the mounting plate and the mounting post may be fixed by a fastener, that is, the fastener sequentially passes through a corresponding portion of the housing and the mounting plate and then is locked into the second assembly hole, so that assembly between the mounting plate and the housing is not required.

In addition, can also set up the second pilot hole on the mounting panel, the fastener locking runs through the second assembly portion in order to fix mounting panel and erection column of second pilot hole, forms the second step portion of butt mounting panel between the lateral part of second assembly portion and erection column, so design, the cooperation with the second pilot hole in-process is assembled to second assembly portion accessible and is fixed in place the mounting panel in advance.

Referring to fig. 6, in an embodiment of the present utility model, the first assembly part 810 has the first screw thread 860, the second assembly part 820 has the second screw thread 870, the first screw thread 860 and the second screw thread 870 are disposed in the same direction, the first assembly part 810 is assembled with the mounting frame 100 in a screw-fit manner through the first screw thread 860, and the second assembly part 820 is assembled with the mounting plate 730 in a screw-fit manner through the second screw thread 870, and the screw-fit manner has a better axial positioning effect on the mounting post 800, which is beneficial to maintaining the stability of the assembly gap 510. The first and second threads 860 and 870 are threaded in the same direction, so that when one of the first and second fitting parts 810 and 820 is assembled, the other does not cause the previous fitting to be loosened when the other is assembled.

Specifically, the first assembly portion 810 is a threaded post, the mounting frame 100 is provided with a first thread 860 hole that mates with the threaded post, the second assembly portion 820 is a second thread 870 hole, and the fastener 850 passes through the housing 700 and mates with the second thread 870 hole to fix the mounting plate 730 to the mounting post 800.

Of course, the axes of the first thread and the second thread may be set in a non-coincident state, and an example is: the second assembly portion has the chimb, is provided with a plurality of second pilot holes that have the second screw thread on the chimb, and a plurality of second pilot holes encircle the axis setting of erection column, so design, even the opposite direction of second screw thread and first screw thread, the cooperation between the two also can not influence each other.

Referring to fig. 5 to 8 and 13, in one embodiment of the present utility model, based on the above embodiment, the motor 710 includes an output shaft 711, the driving part 720 includes a driving shaft 721 and a driving disc 722 connected between the output shaft 711 and the driving shaft 721, the motor 710 is mounted between the housing 700 and the mounting plate 730, the housing 700 is mounted on the mounting frame 100, the output shaft 711 penetrates the mounting plate 730 to output torque to the driving disc 722, the driving disc 722 transmits torque to the output shaft 711, the driving part 720 further includes a bearing 740 and a bearing mount 750, the bearing mount 750 is mounted on the mounting frame 100, an outer ring 741 of the bearing 740 is abutted between the bearing mount 750 and the mounting plate 730, the driving disc 722 is connected with an inner ring 742 of the bearing 740, the bearing 740 can ensure smooth rotation of the driving disc 722, smooth transmission between the output shaft and the driving disc 722, and the driving shaft 721, and an outer ring 741 of the bearing 740 is abutted between the bearing mount 750 and the mounting plate 730 to fix both the axial direction and the radial direction of the bearing 740, so that the radial restriction of the driving part 720 can be performed.

The mounting plate 730 is provided with an aperture 731, and an outer ring 741 of the bearing 740 abuts the mounting plate 730 around the aperture 731, and the output shaft 711 extends through the aperture 731 to be in driving engagement with the driving plate 722. The openings are provided to enable the motor 710 on the other side of the mounting plate 730 to output torque through the output shaft 711 to the drive plate 722, with the inner race 742 of the bearing 740 being located within the aperture 731 without contacting the mounting plate 730 to effect rotation thereof relative to the outer race 741.

Referring to fig. 5 to 8 and 13 to 15, in one embodiment of the present utility model, one of the output shaft 711 and the drive disc 722 and one of the drive disc 722 and the drive shaft 721 is axially and the other is circumferentially clearance fit. The towing hook 200 can bear larger acting force in the use process, the towing hook 200 can have a trend of rotation and axial displacement, the acting force can be transmitted to the motor 710 through the actuating unit 300 and the transmission part 720, and because an axial gap and a circumferential gap exist on the transmission path of the output shaft 711, the transmission disc 722 and the transmission shaft 721 of the motor 710, the acting force in the axial direction can be interrupted or reduced through the axial gap in the transmission process, and the acting force in the circumferential direction can be interrupted or reduced through the circumferential gap in the transmission process, so that the influence on the motor 710 caused when the towing hook 200 is stressed can be eliminated.

The driving disk 722 is rotatably mounted on the mounting plate 730 to transmit the torque of the motor 710 to the driving shaft 721, so that the axial impact force transmitted to the output shaft 711 can be greatly reduced, the driving disk 722 and the driving shaft 721 are in clearance fit in the circumferential direction, and the output shaft 711 and the driving disk 722 are in clearance fit in the axial direction. Providing a circumferential clearance fit between the drive plate 722 and the drive shaft 721 reduces the circumferential forces acting on the drive plate 722 and the mounting plate 730. The axial force is gradually reduced after being transmitted step by step, and finally is transmitted between the transmission disc 722 and the output shaft 711, and the influence of the axial impact force on the motor 710 can be reduced to the greatest extent by arranging an axial gap between the transmission disc 722 and the output shaft 711.

Further, since the drive shaft 721 is spline-fitted with the first actuator 310. By the spline fit, when the tow hook 200 is subjected to an axial force, the axial force transmitted in the direction of the motor 710 between the drive shaft 721 and the first actuator 310 can be reduced or eliminated by relative movement.

Referring to fig. 13 and 15, in one embodiment of the present utility model, the driving disc 722 includes a disc 7221, a first driving push block 7222 is disposed on a side of the disc 7221 facing the driving shaft 721, a second driving push block 7223 is disposed on a side of the disc 7221 facing the output shaft 711, the driving shaft 721 is provided with a first driving protrusion 7211 in driving engagement with the first driving push block 7222, and the output shaft 711 is provided with a second driving protrusion 7111 in driving engagement with the second driving push block 7223.

The first driving bump 7211 may circumferentially abut against the first driving push block 7222 to transfer torque, the second driving bump 7111 may circumferentially abut against the second driving push block 7223 to transfer torque, and the output shaft 711 and the driving disc 722 may be able to transfer torque without a fixed connection between the driving shaft 721 and the driving disc 722, so as to facilitate assembly of the driving member 720 and the motor 710, thereby also allowing a relative positional change between the output shaft 711 and the driving disc 722, and between the driving shaft 721 and the driving disc 722 to eliminate an external force transferred from the tow hook 200 to the motor 710.

The first driving protrusions 7211 are arranged in pairs, and a first driving groove 760 which is matched with the first driving pushing block 7222 is formed between the two first driving protrusions 7211, and the first driving pushing block 7222 is in clearance fit with at least one side wall of the first driving groove 760. The first driving protrusion 7211 is fitted into the first driving groove 760, and the first driving protrusion 7211 abuts against one of the inner walls of the first driving groove 760 to be able to transmit the rotational torque, while a gap is maintained between the first driving protrusion 7211 and the other inner wall of the first driving groove 760. When the motor 710 drives the towing hook 200 to switch to the storage position or the unfolding position, the motor 710 outputs reverse torque immediately, so that the first transmission pushing block 7222 rotates a certain angle and keeps a gap with both inner walls of the first transmission groove 760, and the first transmission pushing block 7222 can rotate in two directions relative to the two first transmission protruding blocks 7211, so that circumferential acting forces in the two directions are prevented from being transmitted to the motor 710. As shown in fig. 14, the first transmission push block pushes the first transmission projection to rotate, when the motor rotates in place, the motor turns over a certain angle to enable the first transmission projection to rotate to the e position, and at this time, the two sides of e keep a distance with the first transmission push block.

The first driving pushing block 7222 has a strip structure, and can be simultaneously contacted with part of two inner walls of the first driving groove 760 when torque is transmitted. The two ends of the first transmission groove 760 in the radial direction taper towards the axis of the disc 7221 to form two symmetrical sector areas 761, and the first transmission protrusions 7211 respectively extend into the two sector areas 761. As shown in fig. 14, the two first transmission push blocks in fig. 14 have surfaces with two ends connected and included angles, so that two mutually communicated fan-shaped areas can be formed between the two first transmission push blocks, two ends of the first transmission convex block are respectively located in one fan-shaped area, one side of the first transmission convex block can be abutted against one of the first transmission push blocks during transmission, and the other side of the first transmission convex block can be abutted against the other first transmission push block.

Furthermore, the first drive lugs can also be arranged in pairs to form first drive recesses for the first drive pushers.

The second driving protrusion 7111 is spaced from the plate 7221 so that the second driving protrusion 7111 is in clearance fit with the driving plate 722 in the axial direction, and the second driving protrusion 7111 is spaced from the plate 7221 so that the second driving protrusion 7111 and the plate 7221 can move relatively in the axial direction, thereby buffering the axial force. When the distance between the second driving protrusion 7111 and the disc 7221 changes, the second driving protrusion 7111 can be circumferentially offset with the second driving push block 7223 to maintain torque transmission.

The second driving pushing blocks 7223 are arranged in pairs, a second driving groove 770 which is matched with the second driving convex blocks 7111 is formed between the two second driving pushing blocks 7223, the second driving convex blocks 7111 are inserted into the second driving groove 770, when the disc 7221 rotates in the first direction, the second driving convex blocks 7111 can be abutted with one side wall of the second driving groove 770 to transfer torque, and when the disc 7221 rotates in the second direction opposite to the first direction, the second driving convex blocks 7111 can be abutted with the other side wall of the second driving groove 770 to transfer torque. Of course, the second driving protrusions may be arranged in pairs to form second driving grooves adapted to the second driving push blocks.

While the utility model has been described in terms of embodiments, it will be appreciated by those skilled in the art that the utility model is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present utility model are intended to be included within the scope of the appended claims.

Claims (10)

1. The electric trailer hook comprises a mounting frame, a towing hook, an actuating unit and a driving part, wherein a sleeve is arranged on the mounting frame, the towing hook is sleeved on the outer side of the sleeve, the actuating unit is arranged in the sleeve and driven by the driving part to rotate, the driving part comprises a motor and a transmission part, and the electric trailer hook is characterized in that the motor comprises an output shaft, the transmission part comprises a transmission shaft and a transmission disc, the transmission disc comprises a disc body, a first transmission push block and a second transmission push block are arranged on the disc body, one of the transmission shaft and the output shaft is provided with a first transmission lug, the other one of the transmission shaft and the first transmission push block is provided with a second transmission lug, one of the first transmission lugs and the other one of the first transmission lugs are arranged in pairs to form a first transmission groove, and the other one of the first transmission lugs and the first transmission lugs are in clearance fit with the inner wall of the first transmission groove when the towing hook is locked, so that circumferential acting force transmitted to the motor is interrupted by relative rotation when the towing hook bears load, and the second transmission lug and the second transmission push block are in circumferential butt and clearance fit with the disc body.

2. The electric trailer hook of claim 1, wherein the drive member further comprises a mounting plate for axially positioning the drive member, the motor and the drive member being disposed on opposite sides of the mounting plate, respectively.

3. The electric trailer hook of claim 2, wherein the transmission member further comprises a bearing and a bearing mount, the bearing mount being mounted on the mounting bracket, an outer race of the bearing abutting between the bearing mount and the mounting plate, the transmission plate connecting an inner race of the bearing.

4. An electric trailer hook as claimed in claim 3, wherein the mounting plate is provided with an aperture, the outer race of the bearing being in abutment with the mounting plate at the periphery of the aperture, the output shaft passing through the aperture for driving engagement with the drive plate.

5. The electric trailer hook of claim 3, wherein said drive plate is circumferentially clearance fit with said drive shaft and said output shaft is axially clearance fit with said drive plate.

6. The electric trailer hook of claim 1, wherein the first drive tab and the first drive push block are circumferentially abutted to transmit torque when the towing hook is rotated, and wherein the motor drives the drive disk to reverse to a position that circumferentially clearance fits the first drive tab and the first drive push block when the towing hook is stopped from rotating.

7. The electric trailer hook as claimed in claim 1, wherein the two ends of the first transmission groove in the radial direction taper toward the axis of the tray body.

8. The electric trailer hook of claim 1, wherein one of the second drive push block and the second drive tab is paired to form a second drive recess, the other fitting into the second drive recess.

9. The electric trailer hook of claim 1, wherein the mounting bracket further comprises a sleeve, the towing hook is rotatably mounted on the sleeve, an elastic member and a positioning portion for axially positioning the sleeve are provided on the sleeve, and the elastic member is pressed between the positioning portion and the towing hook.

10. The electric trailer hook of claim 1, wherein the drive shaft is in splined engagement with the actuation unit.