CN112590474A

CN112590474A - Automobile-used rotatable back towing pintle and vehicle

Info

Publication number: CN112590474A
Application number: CN202011528219.0A
Authority: CN
Inventors: 吕超; 郭东卿; 赵�智; 索联兵
Original assignee: Dongfeng Off Road Vehicle Co Ltd
Current assignee: Dongfeng Off Road Vehicle Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-04-02

Abstract

The invention belongs to the technical field of automobile accessories, and particularly discloses a rotatable rear towing hook for an automobile and the automobile. The rear support seat is fixedly connected with the frame through a rear support seat fixing bolt, and a cavity for accommodating the buffer block is formed between the rear support seat and the towing hook; the periphery of the front supporting seat is fixedly connected with the frame through a front supporting seat fixing bolt, an opening used for penetrating through the traction hook is formed in the middle of the front supporting seat, the front supporting seat and the traction hook are in shaft fit connection, and the traction hook can rotate or slide back and forth along the front supporting seat. The invention can improve the capability of bearing the backward pulling force, the forward pushing force and the up-and-down force transmitted to the towing hook by the trailer on the premise of not changing the length of the towing hook.

Description

Automobile-used rotatable back towing pintle and vehicle

Technical Field

The invention belongs to the technical field of automobile accessories, and particularly relates to a rotatable rear towing hook for an automobile and the automobile.

Background

The rear towing hook of the off-road vehicle is used for towing a central shaft trailer and the like, and when the off-road vehicle runs on an off-road, the rear towing hook bears a large force in the vertical direction, so that the rear towing hook is required to have high strength. The minimum ground clearance, the departure angle, of off-road vehicles limits the rear hitch from increasing in strength by increasing in length. The existing structure rear towing hook can not meet the requirements at the same time.

Chinese patent CN102431401A proposes a lubricating and sealing device for a full-trailer towing hook, which is prone to malfunction of a supporting seat and a frame tail cross beam due to excessive vertical force when the towing hook is used in a mid-axle trailer or off-road. When the length of the supporting seat is increased, the length of the towing hook is correspondingly increased, and the problem that the leaving angle of the vehicle is reduced is caused.

Based on the defects and shortcomings, the field needs to make a further improved design on the existing towing hook, construct a towing hook which is safe and reliable and meets the requirements on strength, and solve the problem that the strength is improved in a mode of increasing the length of the rear towing hook due to the limitation of the minimum ground clearance and the departure angle of the off-road vehicle in the prior art by changing the force transmission mode on the premise of not changing the length of the towing hook.

Disclosure of Invention

Aiming at the defects or the improvement requirements of the prior art, the invention provides a rotatable rear towing hook for a vehicle and the vehicle, wherein the rotatable rear towing hook is correspondingly designed by combining the characteristics of the rear towing hook and the characteristics of the minimum ground clearance and the minimum departure angle of the vehicle, the structures of key components of the rotatable rear towing hook, such as a towing hook, a lock nut, a rear supporting seat, a buffer block and a front supporting seat, and the specific arrangement mode of the structures are researched and designed, the problem that the strength is improved by increasing the length of the rear towing hook due to the minimum ground clearance and the departure angle of a cross-country vehicle in the prior art can be correspondingly effectively solved, meanwhile, the rotatable rear towing hook can improve the backward pulling force, the forward pushing force and the up-and-down force transmitted to the towing hook by a trailer under the premise of not changing the length of the towing hook, meets the use requirements of the trailer, has simple connection mode and low cost, is convenient to use.

In order to achieve the purpose, the invention provides a rotatable rear towing hook for a vehicle, which comprises a towing hook, and a lock nut, a buffer block and a front supporting seat which are sequentially arranged on the periphery of the towing hook, wherein,

the locking nut is fixedly arranged at the tail end of the traction hook;

a rear supporting seat is fixedly arranged on the periphery of the locking nut, one end of the rear supporting seat is in shaft fit connection with the locking nut, the locking nut can rotate around the rear supporting seat or slide back and forth, the other end of the rear supporting seat extends to the front supporting seat, the periphery of the rear supporting seat is fixedly connected with a frame through a plurality of rear supporting seat fixing bolts, and a cavity for accommodating the buffer block is formed between the rear supporting seat and the traction hook;

the periphery of the front supporting seat is fixedly connected with the frame through a plurality of front supporting seat fixing bolts, an opening used for penetrating a traction hook is formed in the middle of the front supporting seat, the front supporting seat is connected with the traction hook in a shaft matching mode, the traction hook can rotate or slide back and forth along the front supporting seat, in this way, the force in the vertical direction, received by the traction hook, is transmitted to the frame through the front supporting seat and the rear supporting seat, the thrust in the horizontal direction, received by the traction hook, sequentially passes through the traction hook, the buffer block and the rear supporting seat and is transmitted to the frame, and the tension in the horizontal direction, received by the traction hook, sequentially passes through the traction hook, the locking nut, the buffer block and the front supporting seat and is transmitted.

Preferably, the front support base includes a front support sleeve and a front support plate, the front support sleeve and the front support plate are fixedly connected, the front support sleeve is disposed on the periphery of the towing hook, the towing hook can rotate around the front support sleeve or slide back and forth, the front support plate is disposed at one end of the front support sleeve close to the buffer block, and the front support plate is provided with a plurality of mounting holes for mounting the front support base fixing bolts.

As a further preferred, the front support seat further includes a front support corner joint plate disposed at a junction between the front support sleeve and the front support plate, one side of the front support corner joint plate extends to an end of the front support sleeve away from one end of the front support plate, the other side of the front support corner joint plate extends to an outer peripheral end of the front support plate, the front support corner joint plate is provided with a plurality of front support corner joint plates, and the plurality of front support corner joint plates are arranged in a symmetrical array along a center line of the front support sleeve.

As further preferred, back supporting seat is including the first back supporting plate, back supporting sleeve and the second back supporting plate that connect gradually, first back supporting plate is located back supporting sleeve is close to the one end of preceding supporting seat, and this first back supporting plate is through corresponding a plurality of preceding supporting seat fixing bolt and frame fixed connection, back supporting sleeve with it holds to draw to form one between the hook the cavity of buffer block, and this back supporting sleeve with lock nut fixed connection, the second back supporting plate is through a plurality of back supporting seat fixing bolt and frame fixed connection.

As a further preferred feature, the rear support base further includes a plurality of rear support reinforcing plates provided on the rear support sleeve, the rear support reinforcing plates are arranged along the central axis direction of the rear support sleeve, and one end of each rear support reinforcing plate is fixedly connected to the first rear support plate, and the other end of each rear support reinforcing plate is fixedly connected to the second rear support plate.

Preferably, a side of the rear support reinforcing plate not connected to the rear support sleeve is a curved arc surface.

Preferably, the hook includes a hook portion and a shaft portion, and an outer surface of the shaft portion is a tapered surface.

Preferably, a front base plate is arranged at one end, close to the front supporting seat, of the buffer block, a rear base plate is arranged at one end, close to the locking nut, of the buffer block, and the rear base plate is in contact fit with the locking nut.

As a further preferred option, the lock nut includes an internal thread, an outer surface, a front end surface and a rear end surface, the internal thread is in threaded connection with the towing hook, the outer surface is in shaft fit with the rear support block, the front end surface is a tapered surface, the tapered surface is in contact fit with the rear cushion plate, and the rear end surface is a hexagonal head with a groove structure in the periphery.

Preferably, the towing hook is further provided with a split pin, the split pin comprises a pin shaft rod and a pin shaft fixing head which are integrally formed, the pin shaft rod penetrates through the towing hook along the radial direction of the towing hook, and the pin shaft fixing head is located in the groove structure.

Preferably, the fixing device further comprises a fixing and mounting module, wherein the fixing and mounting module comprises a main mounting plate, an auxiliary mounting plate arranged at an interval with the main mounting plate, and a connecting plate arranged on the main mounting plate and the auxiliary mounting plate; wherein a reinforcing rib plate is also arranged between the main mounting plate and the auxiliary mounting plate; the main mounting plate is provided with a first mounting hole; a second mounting hole is formed in the auxiliary mounting plate; the first mounting hole and the second mounting hole are the same in size and correspond in position and are used for mounting a traction hook; the main mounting plate is connected with the front supporting seat; the auxiliary mounting plate is connected with the rear supporting seat.

According to another aspect of the invention, there is also provided a vehicle having the above-described rotatable rear hitch for a vehicle mounted thereon.

Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:

1. the invention adopts a front and rear double-support structure to support the towing hook by adding the rear support seat at the locking nut. The rear supporting seat is connected with the frame and is matched with the locking nut through a shaft. The force of the towing hook in the up-and-down direction is transmitted to the frame through the front supporting seat and the rear supporting seat at the same time, and the force in the forward direction and the backward direction is transmitted to the front supporting seat and the rear supporting seat and then transmitted to the frame. The force of the towing hook is transmitted to the frame only through the single point of the supporting seat, and in this way, the supporting seat and the locking nut are improved on the premise of not changing the length of the towing hook, the strength problem is solved by adopting a double-supporting-seat structure, and meanwhile, the vehicle departure angle cannot be reduced.

2. The invention adopts a double-support seat structure of a front support seat and a rear support seat, and the front support seat is fixed on a vehicle body. The front supporting seat is connected with the rear supporting seat and fixed on the vehicle body. The force of the towing hook is transmitted to the vehicle body through the front supporting seat and the rear supporting seat simultaneously, the towing hook penetrates through the front supporting seat, the front supporting seat and the rear supporting seat are matched through a shaft, and the towing hook can rotate along the shaft and slide back and forth; the rear supporting seat penetrates through the outer surface of the locking nut and is matched with the outer surface of the locking nut through a shaft, and the locking nut can rotate along the shaft and can slide back and forth. The vertical force received by the towing hook is transmitted to the frame through the front supporting seat and the rear supporting seat, the horizontal thrust received by the towing hook is transmitted to the frame sequentially through the towing hook, the buffer block and the rear supporting seat, and the horizontal tension received by the towing hook is transmitted to the frame sequentially through the towing hook, the lock nut, the buffer block and the front supporting seat.

3. The invention can obviously improve the capability of bearing the backward pulling force, the forward pushing force and the up-and-down force transmitted by the trailer to the towing hook, meets the use requirement of the trailer on off-road roads, has simple connection mode, low cost and convenient use, and does not need to increase the length of the towing hook.

4. The invention solves the problem that when the vehicle runs on a cross-country road, the corner between the tractor and the trailer is too large, so that parts such as a towing hook and the trailer are damaged.

Drawings

Fig. 1 is a schematic perspective view of a rotatable rear hitch for a vehicle according to a preferred embodiment of the present invention;

fig. 2 is a cross-sectional view of fig. 1.

FIG. 3 is a schematic perspective view of a rotatable rear hitch for a vehicle according to another preferred embodiment of the present invention;

fig. 4 is a schematic structural diagram of a locking key related to the rotatable rear towing hook for the vehicle.

In all the figures, the same reference numerals denote the same features, in particular: 1-towing hook, 2-front supporting seat, 3-front backing plate, 4-buffer block, 5-rear backing plate, 6-rear supporting seat, 7-locking nut, 8-rear supporting seat fixing bolt, 9-cotter pin, 10-front supporting seat fixing bolt, 11-fixed mounting module and 12-locking key.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 and fig. 2, a rotatable rear towing hook for a vehicle according to an embodiment of the present invention includes a towing hook 1, and a lock nut 7, a buffer block 4, and a front supporting seat 2 sequentially disposed on an outer periphery of the towing hook, where the lock nut 7 is fixedly disposed at a tail end of the towing hook 1; a rear support seat 6 is further arranged on the periphery of the locking nut 7, one end of the rear support seat 6 is in shaft fit connection with the locking nut 7, the locking nut 7 can rotate around the rear support seat 6 or slide back and forth, the other end of the rear support seat 6 extends to the front support seat 2, the periphery of the rear support seat 6 is fixedly connected with a frame through a rear support seat fixing bolt 8, and a cavity for accommodating the buffer block 4 is formed between the rear support seat 6 and the towing hook 1; the periphery of the front supporting seat 2 is fixedly connected with a frame through a front supporting seat fixing bolt 10, the middle part of the front supporting seat 2 is provided with an opening for passing through the towing hook 1, the front supporting seat 2 is matched and connected with the towing hook 1 through a shaft, the towing hook 1 can rotate or slide back and forth along the front supporting seat 2, in this way, the vertical force received by the towing hook 1 is transmitted to the vehicle frame through the front bearing support 2 and the rear bearing support 6, the horizontal pulling force applied to the towing hook 1 is transmitted to the frame through the towing hook 1, the locknut 7, the contact surface between the locknut 7 and the buffer block 4, and the contact surface between the buffer block 4 and the front support base 2 in turn, the horizontal thrust received by the towing hook 1 sequentially passes through the contact surface between the towing hook 1 and the buffer block 4, and the contact surface between the buffer block 4 and the rear support seat 6 is transmitted to the frame. More specifically, in the invention, the lock nut 7 is fixedly connected with the towing hook 1, the lock nut 7 is in shaft fit connection with the rear support seat 6, the lock nut 7 can rotate or slide back and forth along the rear support seat 6, the front support seat 2 is in shaft fit connection with the towing hook 1, the towing hook 1 can rotate or slide back and forth along the front support seat 2, meanwhile, the front support seat 2 and the rear support seat 6 are fixedly arranged on the vehicle frame, in this way, the free rotation of the towing hook 1 can be realized, meanwhile, two ends of an inner ring of the buffer block 4 are respectively contacted with the towing hook 1 and the lock nut 7, an outer ring of the buffer block 4 is respectively contacted with the front support seat 2 and the rear support seat 6, and the stress of the towing hook can be transferred to the vehicle frame in different ways according.

In a preferred embodiment of the present invention, the towing hook 1 includes a towing hook portion and a shaft portion, and an outer surface of the shaft portion is a tapered surface. More specifically, the axial region includes fixed connection's first axial region, conical shaft and third axial region in proper order, first axial region one end with draw hook portion fixed connection, the main aspects of conical shaft with first axial region fixed connection, and the cross section of the main aspects of this conical shaft is less than the cross section of first axial region, it is corresponding, the periphery of this conical shaft is located to buffer 4 cover, and buffer 4 is close to the one end of preceding bearing frame 2 and extends to on the terminal surface that first axial region is connected with the conical shaft, simultaneously, the other end of buffer 4 extends to lock nut 7 department, and like this way, the power of vertical direction that towing hook 1 received passes through preceding bearing frame 2 and back bearing frame 6 and transmits to the frame, horizontal direction's thrust that towing hook 1 received loops through towing hook 1, buffer 4 and back bearing frame 6 in proper order, horizontal direction's that towing hook 1 received loop through towing hook 1, The lock nut 7, the cushion block 4 and the front bearing support 2 are transferred to the frame.

In the invention, the towing hook part comprises a towing hook body and a locking hook. The towing hook part is used for hanging the hook, and the towing hook part also comprises an openable locking key for preventing the hook from falling off, as shown in figure 4. Wherein the locking key 12 is arranged on the traction hook part. More specifically, the locking key 12 includes a first fixing hole and a second fixing hole formed on the locking hook for fixing the locking hook, and a fixed pin shaft and a movable pin shaft are inserted into the second fixing hole and the first fixing hole respectively for locking the locking hook, wherein the fixed pin shaft serves as a rotation shaft of the locking hook, the movable pin shaft serves as a locking point for preventing the locking hook from rotating, the locking hook can be rotated after the movable pin shaft is drawn out to open or close the traction device, particularly, the traction hook body and the locking hook are tightly fitted, no additional movable space needs to be provided when the locking hook is rotated, the movable part of the locking hook rotates in a recessed space inside the traction hook body, when the locking hook is integrally installed at the rear of the vehicle and located at the bottom of the vehicle, the traction device is opened or closed without affecting the space of the upper compartment or door structure, the movement is not restricted, and the shaft part of the traction hook is of a, the whole traction hook device can rotate around the fixed shaft to be installed, the axial angle of the traction device can be changed conveniently according to actual use requirements, and the traction hook device is suitable for being used in complicated and changeable field environments.

Furthermore, the fixed shaft also comprises a fixed clamping groove, a shaft body and a connector, wherein the shaft body is of a round shaft structure, the connector with larger shaft diameter and the towing hook body form an integrated structure, the shaft diameter of the connector at the joint is increased to improve the stress effect at the joint, the fixed clamping groove is an annular groove arranged at the end part of the shaft body, the fixed clamping groove provides a stress point when the shaft body is inserted into a fixed hole at the tail part of a vehicle, the whole shaft body can adjust the installation angle around the axial direction according to actual requirements, further, the towing hook body also comprises a first fixed hole, a first fixed head, a second fixed hole and a second fixed head, the second fixed head is preferably of an L-shaped structure, the fixed shaft 1, the second fixed head and the first fixed head are of an integrated structure, the first fixed head is flat and forms a U-shaped structure together with the second fixed head, and the first fixed hole and the second fixed hole which are communicated are also arranged on the first fixed head, the traction hook body and the shaft part can be formed in one step by adopting a forging process in the device, so that the strength of the connection part of the traction device and a vehicle body is ensured, the shape is relatively simple, the traction hook can be formed by forging, and the manufacturing cost of the device is reduced.

The locking hook also comprises a connector and a hook end, the connector and the hook end are also of an integrally formed structure, the hook end is provided with a radian, one end of the hook end is directly connected with the two connectors to form an L-shaped traction hook, furthermore, a groove-shaped structure is formed between the two connectors and can be used for inserting the flat first fixing head, the two connectors are respectively and symmetrically provided with a first connecting hole and a second connecting hole, the axes of the first connecting holes on the two connectors are coincident, the axes of the second connecting holes are also coincident, after the first fixing head is inserted into the groove-shaped structure on the locking hook, the first fixing hole is consistent with the first connecting hole in size and the axes are coincident, the second fixing hole is consistent with the second connecting hole in size and the axes are coincident, at the moment, the fixing pin shaft passes through the second fixing hole and the second connecting hole and is fixed, and the locking hook rotates around the fixing pin shaft, the movable pin shaft penetrates through the first fixing hole and the first connecting hole and is fixed, the locking hook is completely fixed and cannot move at the moment, the trailer ring is locked in the traction device, and further, when the locking hook is opened around the fixed pin shaft, the size of the connector is slightly smaller than the size of the space of the U-shaped groove in the traction hook body, and the end part of the connector is provided with an arc matched with the second fixing head, so that the connector can rotate inside the locking hook when moving while the strength of the connector is guaranteed, unnecessary movable space does not need to be reserved, particularly, when the traction hook is integrally installed at the tail part and the bottom of a vehicle, a carriage or a vehicle door structure above the traction hook cannot reserve space for the traction hook, and the traction device can be used for off-road vehicles or military tail vehicles under the condition.

Furthermore, the fixed pin shaft also comprises a cotter pin, a gasket, a first baffle plate and a fixed pin shaft locking hole, the shaft diameter of the first baffle plate is larger than that of the fixed pin shaft, the first baffle plate and the fixed pin shaft are of an integrally formed structure, the other end of the fixed pin shaft is vertically and axially provided with the fixed pin shaft locking hole in a through mode, the fixed pin shaft can be fixed in the second fixed hole through the inward insertion of the cotter pin, so that the locking hook is prevented from falling off, preferably, the gasket can be arranged between the cotter pin and the locking hook to prevent the cotter pin from being worn when the locking hole rotates, further, the movable pin shaft also comprises a locking hole, a quick-release pin, a pull ring and a second baffle plate, the movable pin shaft adopts a structure similar to the fixed pin shaft, the shaft diameter of the second baffle plate is larger than that of the fixed pin shaft, the second baffle plate and, the quick-release pin is inserted into the quick-release pin, preferably, the quick-release pin is more convenient to pull out than the split pin, the two ends of the quick-release pin and the split pin are provided with bent or round parts for preventing the quick-release pin from falling off from holes, the movable pin shaft penetrates through the first connecting hole and the first fixing hole and then is fixed at two ends respectively, and therefore locking holes are prevented from moving.

As a preferable scheme of the present invention, the front support base 2 and the rear support base 6 are fixedly connected to the frame through a fixing bracket, and the transmission of the force between the towing hook and the frame is realized through the fixing bracket.

As a preferable scheme of the present invention, the front support base 2 includes a front support sleeve and a front support plate, the front support sleeve and the front support plate are fixedly connected, the front support sleeve is sleeved on the periphery of the towing hook 1, the towing hook 1 can rotate or slide back and forth along a central axis of the front support sleeve, the front support plate is fixedly disposed at one end of the front support sleeve close to the buffer block 4, and the front support plate is provided with a plurality of front support base fixing bolts 10, and the front support base fixing bolts 10 are used for fixedly connecting the front support plate and the frame. The front supporting seat 2 further comprises a front supporting angle joint plate arranged at the joint of the front supporting sleeve and the front supporting plate, one side of the front supporting angle joint plate extends to the end part, far away from one end of the front supporting plate, of the front supporting sleeve, the other side of the front supporting angle joint plate extends to the peripheral end part of the front supporting plate, the front supporting angle joint plate is provided with a plurality of front supporting angle joint plates, and the front supporting angle joint plates are arranged in a symmetrical array mode along the center line of the front supporting sleeve.

As a preferred scheme of the present invention, the rear support base 6 includes a first rear support plate, a rear support sleeve and a second rear support plate, which are sequentially connected, the first rear support plate is disposed at one end of the rear support sleeve close to the front support base 2, and the first rear support plate is also fixedly connected to the frame through a plurality of corresponding front support base fixing bolts 10, a cavity for accommodating the buffer block 4 is formed between the rear support sleeve and the towing hook 1, the rear support sleeve is in shaft fit connection with the lock nut 7, and the second rear support plate is fixedly connected to the frame through a plurality of rear support base fixing bolts 8. Rear support 6 still includes a plurality of back supporting reinforcing plate of locating on the back supporting sleeve, this back supporting reinforcing plate is followed back supporting sleeve's axis direction is arranged, and this back supporting reinforcing plate one end and first back supporting plate fixed connection, the other end with back supporting plate fixed connection behind the second. One side of the rear support reinforcing plate, which is not connected with the rear support sleeve, is an arc curved surface.

As a preferable scheme of the present invention, a front cushion plate 3 is disposed at one end of the buffer block 4 close to the front support base 2, a rear cushion plate 5 is disposed at one end of the buffer block 4 close to the lock nut 7, and the rear cushion plate 5 is in contact fit with the lock nut 7.

As a preferred scheme of the present invention, the lock nut 7 includes an internal thread, an outer surface, a front end surface and a rear end surface, the internal thread is in threaded connection with the towing hook 1, the outer surface is in shaft fit with the rear support base 6, the front end surface is a tapered surface, the tapered surface is in contact fit with the rear cushion plate 5, the rear end surface is in a hexagonal head groove structure, the towing hook 1 is further provided with a cotter pin 9, the cotter pin 9 includes an integrally formed pin shaft rod and a pin shaft fixing head, the pin shaft rod penetrates through the towing hook 1 along the radial direction of the towing hook 1, and the pin shaft fixing head is located between grooves of the lock nut 7. Wherein, the hexagon head is used for the loading and unloading of lock nut 7, and groove structure is used for the spacing of split pin 9.

When the rotatable rear towing hook is subjected to vertical force, the towing hook simultaneously transmits the force to a vehicle frame through the front supporting seat 2 and the rear supporting seat 6. In-process that the towing hook was pushed, backing plate 3 before towing hook 1 promoted to with power transmission to preceding backing plate 3, preceding backing plate 3 promotes buffer block 4, and with power transmission to buffer block 4, buffer block 4 promotes back backing plate 5, and transmits power for back backing plate 5, and back backing plate 5 promotes back bearing frame 6, and transmits power to back bearing frame 6, and finally, back bearing frame 6 will transmit power for rather than fixed connection's frame. In the process that the towing hook is pulled, the towing hook 1 pulls the locking nut 7 and transmits force to the locking nut 7, the locking nut 7 pulls the rear cushion plate 5 and transmits force to the rear cushion plate 5, the rear cushion plate 5 pulls the buffer block 4 and transmits force to the buffer block 4, the buffer block 4 pulls the front cushion plate 3 and transmits force to the front cushion plate 3, the front cushion plate 3 pulls the front support base 2 and transmits force to the front support base 2, and finally, the front support base 2 transmits force to a frame fixedly connected with the front support base 2. Therefore, the rear towing hook can bear the backward pulling force, the forward pushing force and the up-and-down force transmitted to the towing hook by the trailer, meets the use requirement of the trailer, and has the advantages of simple connection mode, low cost and convenient use.

In one embodiment of the present invention, the front bearing support 2 and the rear bearing support 6 are fixed to the vehicle body. The front bearing support 2 and the rear bearing support 6 are connected. The vertical force applied to the towing hook is transmitted to the vehicle body through the front support base 2 and the rear support base 6 at the same time. The force borne by the towing hook, especially the force in the up-and-down direction, is larger under the condition of the same length. The traction hook 1 penetrates through the front support base 2, the front support base and the front support base are matched through a shaft, and the traction hook 1 can rotate along the shaft and slide back and forth; the rear bearing seat 6 penetrates through the outer surface of the locking nut 7 and is in shaft fit with the outer surface of the locking nut 7, and the locking nut 7 can rotate along the shaft and slide back and forth. The vertical force of the towing hook is transmitted to the vehicle body through the front support base 2 and the rear support base 6 at the same time. The anterior power is passed through lock nut 7, back bolster 5, buffer block 4, preceding bolster 3, and preceding bolster 3 and preceding bearing frame transmit, and last preceding bearing frame transmits power to rather than fixed connection's frame on, and the power at rear portion transmits through towing hook 1, preceding bolster 3, buffer block 4, back bolster 5 and back bearing frame 6, and back bearing frame 6 is last with transmitting power on transmitting rather than fixed connection's frame. The tow hook 1 is rotatable around the front bearing block 2 and the rear bearing block 6. The problem of when going on cross-country road, parts such as towing hook, trailer damage is leaded to with the trailer corner too big to the tractor.

The front base plate 3, the buffer block 4 and the rear base plate 5 penetrate through the traction hook and are fixed through the locking nut 7, and the split pin 9 is used for locking the locking nut. When the towing hook receives thrust, the towing hook 1 pushes the inner ring of the front backing plate 3, the front backing plate 3 pushes the buffer block 4, the buffer block 4 pushes the rear backing plate 5, and the outer ring of the rear backing plate 5 pushes the rear bearing seat 6. When the traction hook 1 is pulled, the traction hook 1 pulls the locking nut 7, the locking nut 7 pulls the inner ring of the rear cushion plate 5, the rear cushion plate 5 pulls the buffer block 4, the buffer block 4 pulls the front cushion plate 3, and the outer ring of the front cushion plate 3 pulls the front support seat 2. When the traction hook is pulled and pushed, the buffer block plays a buffer role.

The rear bearing seat 6 may not be connected with the front bearing seat 2, and the rear bearing seat 6 and the front bearing seat 2 are respectively connected with the frame, so that the same function can be realized.

As shown in fig. 3, as a preferred embodiment of the present invention, the rear towing hook further includes a fixed mounting module, a main mounting plate, an auxiliary mounting plate installed at an interval with the main mounting plate, and a connecting plate installed on the main mounting plate and the auxiliary mounting plate; a reinforcing rib plate is also arranged between the main mounting plate and the auxiliary mounting plate; the main mounting plate is provided with a first mounting hole; a second mounting hole is formed in the auxiliary mounting plate; the first mounting hole and the second mounting hole are the same in size and correspond in position and are used for mounting a traction hook; the main mounting plate is connected with the front supporting seat of the traction hook; the auxiliary mounting plate is connected with the rear supporting seat of the traction hook.

The connecting plate will main mounting panel with the vice mounting panel encloses into open-ended box-like, main mounting panel with the form of vice mounting panel is the same, still install the oil tank support on the vice mounting panel. The main mounting plate and the auxiliary mounting plate are respectively provided with a plurality of bolt holes, and the main mounting plate, the auxiliary mounting plate, the connecting plate and the reinforcing rib plate are respectively provided with lightening holes. The main mounting plate, the auxiliary mounting plate, the connecting plate and the reinforcing rib plate are welded into a whole. The traction hook comprises a main mounting plate, an auxiliary mounting plate, a front supporting seat assembly, a rear supporting seat assembly and a rear supporting seat assembly, wherein the main mounting plate and the auxiliary mounting plate are arranged, and the main mounting plate and the auxiliary mounting plate are matched with each other; reinforcing rib plates are symmetrically arranged between the main mounting plate and the auxiliary mounting plate and used for resisting the vertical force applied to the rear traction hook mounting device, so that the stability and strength of the structure are enhanced, and the structure is protected from being damaged; the problem that the structure is damaged easily due to overlarge bending moment when the force in the vertical direction generated by the traction hook on the mounting bracket is overlarge is solved; the invention has simple structure, convenient use and high practicability.

The rotatable rear towing hook for the vehicle is used for the vehicle, is convenient to use, safe and reliable, and has high practicability.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A rotatable rear towing hook for a vehicle is characterized by comprising a towing hook (1), and a locknut (7), a buffer block (4) and a front supporting seat (2) which are sequentially arranged on the periphery of the towing hook,

the locking nut (7) is fixedly arranged at the tail end of the traction hook (1);

a rear supporting seat (6) is fixedly arranged on the periphery of the locking nut (7), one end of the rear supporting seat (6) is in shaft fit connection with the locking nut (7), the locking nut (7) can rotate around the rear supporting seat (6) or slide back and forth, the other end of the rear supporting seat (6) extends to the position of the front supporting seat (2), the periphery of the rear supporting seat (6) is fixedly connected with a vehicle frame through a plurality of rear supporting seat fixing bolts (8), and a cavity for accommodating the buffer block (4) is formed between the rear supporting seat (6) and the traction hook (1);

the periphery of the front supporting seat (2) is fixedly connected with the frame through a plurality of front supporting seat fixing bolts (10), the middle part of the front supporting seat (2) is provided with an opening for passing through the traction hook (1), the front supporting seat (2) is in shaft fit connection with the traction hook (1), the traction hook (1) can rotate or slide back and forth along the front supporting seat (2), in this way, the vertical force received by the towing hook (1) is transmitted to the vehicle frame through the front support base (2) and the rear support base (6), the horizontal thrust force received by the towing hook (1) is transmitted to the frame through the towing hook (1), the buffer block (4) and the rear support seat (6) in turn, the horizontal pulling force borne by the towing hook (1) is transmitted to the frame sequentially through the towing hook (1), the locking nut (7), the buffer block (4) and the front support seat (2).

2. The rotatable rear towing hook for the vehicle according to claim 1, wherein the front supporting seat (2) comprises a front supporting sleeve and a front supporting plate, the front supporting sleeve and the front supporting plate are fixedly connected, the front supporting sleeve is arranged on the periphery of the towing hook (1), the towing hook (1) can rotate around the front supporting sleeve or slide back and forth, the front supporting plate is arranged at one end of the front supporting sleeve close to the buffering block (4), and the front supporting plate is provided with a plurality of mounting holes for mounting the fixing bolts (10) of the front supporting seat.

3. The rotatable rear tow hook for vehicles according to claim 1, wherein the front support pedestal (2) further comprises a front support gusset provided at the junction of the front support sleeve and the front support plate, one side of the front support gusset extends to the end of the front support sleeve away from one end of the front support plate, the other side extends to the peripheral end of the front support plate, the front support gusset is provided with a plurality of front support gussets, and the plurality of front support gussets are arranged in a symmetrical array along the center line of the front support sleeve.

4. The rotatable rear towing hook for the vehicle according to claim 2, wherein the rear supporting seat (6) comprises a first rear supporting plate, a rear supporting sleeve and a second rear supporting plate, which are connected in sequence, the first rear supporting plate is arranged at one end of the rear supporting sleeve close to the front supporting seat (2), and is fixedly connected with the vehicle frame through a plurality of corresponding front supporting seat fixing bolts (10), a cavity for accommodating the buffer block (4) is formed between the rear supporting sleeve and the towing hook (1), and is fixedly connected with the locking nut (7), and the second rear supporting plate is fixedly connected with the vehicle frame through a plurality of rear supporting seat fixing bolts (8).

5. A rotatable rear towing hook for vehicles according to claim 4, characterized in that the rear support base (6) further comprises a plurality of rear support stiffeners provided on the rear support sleeve, the rear support stiffeners being arranged along the central axis of the rear support sleeve, and one end of the rear support stiffeners being fixedly connected to the first rear support plate and the other end being fixedly connected to the second rear support plate;

preferably, one side of the rear support reinforcing plate, which is not connected with the rear support sleeve, is an arc curved surface;

preferably, the towing hook (1) comprises a towing hook part and a shaft part, and the outer surface of the shaft part is a conical surface.

6. A rotatable rear towing hook for vehicles according to any one of claims 1 to 5, characterized in that the end of the bumper block (4) close to the front supporting seat (2) is provided with a front bolster (3), the end of the bumper block (4) close to the lock nut (7) is provided with a rear bolster (5), and the rear bolster (5) is in contact fit with the lock nut (7).

7. A rotatable rear tow hook according to claim 6, characterised in that the locking nut (7) comprises an internal thread, an outer surface, a front end surface and a rear end surface, the internal thread is in threaded connection with the tow hook (1), the outer surface is in axial engagement with the rear support block (6), the front end surface is a conical surface which is in contact engagement with the rear shim plate (5), and the rear end surface is a hexagonal head provided with a groove structure on the periphery.

8. A rotatable rear towing hook for vehicles according to claim 7, characterized in that the towing hook (1) is further provided with a split pin (9), the split pin (9) comprises an integrally formed pin shaft rod and a pin shaft fixing head, the pin shaft rod penetrates through the towing hook (1) along the radial direction of the towing hook (1), and the pin shaft fixing head is located in the groove structure.

9. The rotatable rear hitch of any one of claims 1-5, further comprising a fixed mounting module including a main mounting plate, a secondary mounting plate mounted in spaced relation to the main mounting plate, and a connecting plate mounted on the main mounting plate and the secondary mounting plate; wherein a reinforcing rib plate is also arranged between the main mounting plate and the auxiliary mounting plate; the main mounting plate is provided with a first mounting hole; a second mounting hole is formed in the auxiliary mounting plate; the first mounting hole and the second mounting hole are the same in size and correspond in position and are used for mounting a traction hook; the main mounting plate is connected with the front supporting seat (2); the auxiliary mounting plate is connected with the rear supporting seat (6).

10. A vehicle having a rotatable rear hitch for a vehicle as claimed in any one of claims 1 to 9 mounted thereon.