CN219172113U - Trailer hook and vehicle - Google Patents

Abstract

The utility model relates to a trailer hook and a vehicle, comprising: a cylinder body, on which a first connecting part is arranged; the moving part at least partially stretches into the cylinder body and can move along the axial direction of the cylinder body, one end of the moving part, which is positioned outside the cylinder body, is provided with a second connecting part, one of the second connecting part and the first connecting part is used for being connected with a trailer, and the other connecting part is used for being connected with a tractor; and the elastic piece is elastically connected between the cylinder body and the moving piece, wherein magnetic fluid is contained in the cylinder body and is used for generating damping force on the moving piece. When the trailer is used, the elastic piece and the magnetic fluid are arranged in the trailer hook, so that the damping force and the buffer force can be received in the movement process of the moving piece, and further the required buffer shock absorption is provided for the trailer and the tractor in the running process, and rigid collision and the like are avoided.

Description

Trailer hook and vehicle

Technical Field

The present disclosure relates to the field of vehicle traction aids, and in particular, to a towing hook and a vehicle.

Background

In the fields of car rescue and trailers, etc., a trailer hook is widely required, which can connect a tractor with a vehicle to be towed or connect a trailer head with a trailer tail. In addition, in the train field, a trailer hook needs to be arranged between two adjacent carriages.

In the related art, the trailer hook is generally rigid, so that when the tractor starts to accelerate or emergency brake and other driving states, the trailer hook is easy to rigidly collide with the trailer or the tractor, the vehicle is damaged due to the collision, and certain potential safety hazards exist in the driving process.

Disclosure of Invention

It is an object of the present disclosure to provide a towing hook and a vehicle to at least partially solve the problems in the related art.

To achieve the above object, the present disclosure provides a trailer hook comprising: the cylinder body is provided with a first connecting part; the moving part at least partially stretches into the cylinder body and can move along the axial direction of the cylinder body, one end of the moving part, which is positioned outside the cylinder body, is provided with a second connecting part, one of the second connecting part and the first connecting part is used for being connected with a trailer, and the other connecting part is used for being connected with a tractor; and the elastic piece is elastically connected between the cylinder body and the moving piece, wherein magnetic fluid is contained in the cylinder body and is used for generating damping force on the moving piece.

Optionally, the trailer hook further comprises a coil arranged inside the cylinder body, and the coil is used for controlling damping of the magnetic fluid after being electrified.

Optionally, the moving member comprises a pull rod and a piston head connected to one end of the pull rod extending into the cylinder, wherein the coil is arranged inside the piston head; or the trailer hook further comprises a mounting shaft with one end fixed on the inner wall of the cylinder body, and the coil is wound on the mounting shaft.

Optionally, the outer peripheral surface of the piston head abuts against the inner wall of the cylinder body, and a channel is formed in the piston head so as to communicate magnetic fluid at two ends of the piston head.

Optionally, the elastic piece is a coil spring sleeved on the pull rod, one end of the coil spring is connected with the pull rod or the piston head, and the other end of the coil spring is connected with the cylinder body.

Optionally, the opening is seted up to the lateral wall of cylinder body, the opening part is provided with and is used for fixing the mount pad of pull rod, the pull rod passes the mount pad stretches into inside the cylinder body, wherein, the mount pad with be provided with the sealing washer between the pull rod.

Optionally, the inner wall of the cylinder is provided with a first limit portion and a second limit portion spaced apart from each other in an axial direction of the cylinder, and the piston head is limited between the first limit portion and the limit portion.

Optionally, the first limiting part comprises two first protrusions symmetrically arranged on the inner wall of the cylinder body, and the second limiting part comprises two second protrusions symmetrically arranged on the inner wall of the cylinder body.

Optionally, the second connecting part comprises a mounting plate connected to the end of the moving part, and a mounting hole is formed in the mounting plate; the first connecting portion comprises a connecting ring connected to the outer wall of the cylinder body far away from the second connecting portion.

According to a second aspect of the present disclosure, there is provided a vehicle comprising the towing hook described above.

Through above-mentioned technical scheme, when the trailer hook that this disclosure provided is used, because the trailer hook is provided with elastic component and magnetic fluid to make the moving part can receive damping force and cushioning force in the motion process, and then for trailer and tractor provide required buffering shock attenuation in the drive, avoid appearing rigid collision etc..

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a schematic diagram of a tow hook shown in accordance with an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a tow hook shown in accordance with another exemplary embodiment of the present disclosure;

fig. 3 is a schematic diagram of a trailer control system, shown schematically in accordance with the present disclosure.

Description of the reference numerals

100-cylinder body; 110-opening; 200-moving parts; 210-a pull rod; 220-piston heads; 221-channel; 300-elastic member; 410-a first connection; 420-a second connection; 421-mounting holes; 500-coils; 600-mounting a shaft; 700-mounting seats; 800-sealing rings; 910-a first protrusion; 920-second protrusions; 1100-a collection module; 1200-a processing module; 1300-coil drive module; the power module 1400.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, unless otherwise indicated, terms of orientation such as "inner and outer" are used based on the structure of the relevant components themselves, for example: the coil disposed "inside" the cylinder means that the coil is disposed in the accommodation space of the cylinder; the "outer circumferential surface" of the piston head abutting the "inner wall" of the cylinder means that the piston head is in abutment with the inner wall of the cylinder when disposed therein.

In addition, in this disclosure, the terms "first," "second," etc. are used to distinguish one element from another without sequence or importance. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated.

Referring to fig. 1-2, the disclosed embodiment provides a trailer hook including a cylinder 100, a moving member 200 at least partially extending into the cylinder 100 and movable in an axial direction of the cylinder 100, and an elastic member 300 elastically connected between the cylinder 100 and the moving member 200, wherein a first connection part 410 is provided on the cylinder 100, one end of the moving member 200 located outside the cylinder 100 is provided with a second connection part 420, one of the second connection part 420 and the first connection part 410 is used for connection with a trailer, the other is used for connection with a tractor, and a magnetic fluid is contained in the cylinder 100 and used for generating a damping force to the moving member 200.

It should be explained that a trailer hook is a connection device for connection between a tractor and a trailer for transmitting the power of the tractor to the trailer, thereby towing a trailer that is either unpowered or unpowered. Accordingly, the axial direction of the cylinder block 100 refers to the direction of arrow a in fig. 1 and 2, which refers to the arrangement direction of the tractor and the trailer in actual use, in other words, the power direction of the tractor, and the description thereof will not be repeated hereinafter.

The present disclosure does not limit the installation position and structure of the elastic member 300 as long as it connects between the cylinder 100 and the moving member 200 so that the moving member 200 can stretch and compress the elastic member 300 while reciprocating, thereby generating a buffer between the tractor and the trailer. In addition, the elastic member 300 may also be reset after itself is compressed or stretched (this process is needed to accommodate the change in the relative distance between the tractor and trailer) in preparation for the next compression or stretching to complete the cushioning effect. The specific structure and installation position of the elastic member 300 will be described below, and will not be described again.

In the embodiments of the present disclosure, the magnetic fluid refers to a magnetic soft particle suspension formed by mixing tiny soft magnetic particles with high magnetic permeability and low magnetic hysteresis with non-magnetizer liquid, which exhibits low viscosity under the condition of zero magnetic field, and exhibits high viscosity and low fluidity under the action of strong magnetic field, and since the magnetic fluid is well known to those skilled in the art, the magnetic fluid is not described herein too much. In addition, it should be noted that the present disclosure does not limit the amount of the magnetic fluid in the cylinder 100, and it may substantially fill the cylinder 100 while ensuring that the moving member 200 can normally move, and may be adaptively designed according to actual requirements. For example, in case that the mover 200 includes the draw rod 210 and the piston head 220 described below, since the volume of the draw rod 210 entering the cylinder 100 during the reciprocating motion is varied and the volumes of the cylinder 100 and the magnetic fluid are nearly constant, in order to secure the motion of the piston head 220, an external pipe (not shown) may be provided at the sidewall of the cylinder 100, which may discharge the magnetic fluid in the cylinder 100 or inject the magnetic fluid into the cylinder 100 according to actual needs, which is not limited in the present disclosure.

Through using the above-mentioned technical scheme, when using, because the trailer hook is provided with the elastic component 300 that can provide buffer force, restoring force and can provide the magnetic current body of damping force, promptly, make moving part 200 can receive damping force and buffering force in the motion process, and then provide required buffering shock attenuation for trailer and tractor in the drive, avoid appearing rigid collision etc..

The magnetic fluid can be placed in a magnetic field environment, when the magnetic field acting on the magnetic fluid changes, the damping of the magnetic fluid changes according to the characteristics of the magnetic fluid, namely the damping force received by the moving part 200 in movement changes along with the change of the magnetic field, so that the magnetic fluid can adapt to different working conditions. Referring to fig. 1-2, in an embodiment of the present disclosure, the trailer hook may further include a coil 500 disposed inside the cylinder 100, the coil 500 being used to generate a magnetic field after being energized, thereby controlling damping of the magnetic fluid. When in use, the magnetic field is generated by controlling the current in the coil 500, so as to regulate and control the damping value of the magnetic fluid. Since the coil 500 is disposed inside the cylinder 100, damping of the magnetic fluid also located in the cylinder 100 can quickly respond following the current variation in the coil 500. The coil 500 may be powered by a tractor or a trailer, or by a power source (e.g., a battery) provided in the trailer itself. By the design, various damping states can be provided for the trailer hook, namely, the moving part 200 can be damped to different degrees in the moving process, and the device is suitable for different running states of a vehicle, for example, different damping can assist the vehicle to brake quickly, start quickly and the like, and rigid collision between the moving part 200 and the cylinder body 100 is avoided.

In the embodiment of the present disclosure, the specific structure of the moving member 200 is not limited as long as it is satisfied that it is damped by the magnetic fluid when reciprocating in the axial direction of the cylinder 100 within the cylinder 100. It may be a structure having the piston head 220, which will be described later, a stepped shaft structure, or a shaft structure having a convex side wall. For example, referring to fig. 1-2, in an embodiment of the present disclosure, a mover 200 may include a drawbar 210 and a piston head 220 coupled to an end of the drawbar 210 that protrudes into the cylinder 100. Wherein the diameter of the piston head 220 may be greater than the diameter of the pull rod 210. Here, in an embodiment of the present disclosure, the piston head 220 and the draw rod 210 may be integrally formed. Furthermore, in other embodiments, the piston head 220 and the pull rod 210 may be detachably connected. By arranging the piston head 220 with the diameter larger than that of the pull rod 210 at the end part of the pull rod 210 extending into the cylinder body 100, the piston head 220 can be damped by magnetic fluid when the moving member 200 reciprocates along the axial direction of the cylinder body 100, and the damping effect can be realized by matching with the elastic member 300.

In order to maximize the damping force applied to the piston head 220 when reciprocating in the axial direction of the cylinder 100, and thus to enhance the damping effect of the trailer hook, referring to fig. 1-2, in the embodiment of the disclosure, the outer circumferential surface of the piston head 220 may abut against the inner wall of the cylinder 100, so as to increase the blocking area of the piston head 220 when reciprocating in the axial direction of the cylinder 100, and thus to enhance the damping effect. Further, in order to allow the magnetic fluid at both sides of the piston head 220 to communicate, in the embodiment of the present disclosure, a channel 221 may be formed at the piston head 220 to allow the magnetic fluid at both ends of the piston head 220 to communicate. The present disclosure is not limited to the location and number of the channels 221, which may be three, four, etc.

The present disclosure is not limited to the location of the coil 500, for example, referring to fig. 1, in an embodiment of the present disclosure, the coil 500 may be disposed inside the piston head 220. Specifically, an accommodating space may be provided at a position of the piston head 220 near the axial center, and the coil 500 may be disposed in the accommodating space. By the design, the coil 500 can move along with the piston head 220, so that the damping value of magnetic fluid around the piston head 220 can be quickly changed, the response is quick, and the damping value changing effect is obvious.

In addition, referring to fig. 2, in other embodiments, in order to avoid problems of wire clutter, circuit safety, etc. caused by the movement of the coil 500, the trailer hook may further include a mounting shaft 600 having one end fixed to the inner wall of the cylinder 100, and the coil 500 may be wound around the mounting shaft 600. So designed, the coil 500 does not need to follow up when the piston head 220 is moving, and remains stationary, and the circuit is clean and safe.

To energize the coil 500 to produce a strong magnetic field, in embodiments of the present disclosure, the mounting shaft 600 may be a soft magnetic material, such as: silicon steel sheet, cast iron, etc.

Referring to fig. 2, in the embodiment of the present disclosure, the elastic member 300 may be a coil spring sleeved on the pull rod 210, one end of which is connected to the pull rod 210 or the piston head 220, and the other end of which is connected to the cylinder 100. So designed, it is possible to ensure that the coil spring is stretched or compressed while the drawbar 210 reciprocates in the axial direction of the cylinder 100. The elastic piece 300 is sleeved on the pull rod 210, so that the stability of the elastic piece 300 in the moving process can be ensured, and the situation that the stress is separated from the original position so as to lose the buffer effect is avoided.

In an embodiment of the present disclosure, a coil spring may be connected to the drawbar 210 at one end and to the cylinder 100 at the other end. Furthermore, in other embodiments, a coil spring may be connected to the piston head 220 at one end and the cylinder 100 at the other end. The coil spring may be located inside the cylinder 100 or outside the cylinder 100, which is not limited in this disclosure. In addition to the coil springs described above, the elastic member 300 may be a rubber column, a torsion spring, or the like, which is not limited by the present disclosure.

In order that the draw bar 210 may extend into the cylinder 100 and may reciprocate in the axial direction of the cylinder 100, referring to fig. 1 to 2, in an embodiment of the present disclosure, the sidewall of the cylinder 100 may be opened with an opening 110, and a mount 700 for fixing the draw bar 210 may be provided at the opening 110, and the draw bar 210 passes through the mount 700 and extends into the cylinder 100. The present disclosure is not limited in the type of mount 700, and for example, it may be a sleeve mount or the like.

In order to avoid leakage of magnetic fluid caused by a gap between the tie rod 210 and the mount 700, referring to fig. 1-2, a seal ring 800 may be provided between the mount 700 and the tie rod 210 in an embodiment of the present disclosure. The present disclosure does not limit the kind of the seal ring 800, and may be an O-ring, a Y-ring, or the like.

In order to avoid adverse effects caused by excessive movement of the piston head 220 (for example, failure due to compression or excessive stretching of the coil spring in the case where the aforementioned elastic member 300 is a coil spring), in the embodiment of the present disclosure, the inner wall of the cylinder 100 may be provided with a first stopper portion and a second stopper portion spaced apart from each other in the axial direction of the cylinder 100, between which the piston head 220 is restricted.

Specifically, in some embodiments, referring to fig. 1-2, the first stopper may include two first protrusions 910 symmetrically arranged on the inner wall of the cylinder 100, and the second stopper may include two second protrusions 920 symmetrically arranged on the inner wall of the cylinder 100. Furthermore, in other embodiments, the first and second stoppers may be respectively configured as a collar formed at the inner wall of the cylinder body 100, which may limit excessive movement of the piston head 220, and the present disclosure does not limit the structure of the stoppers.

To connect a trailer hook between a trailer and a tractor, referring to fig. 1-2, in an embodiment of the present disclosure, the second connection portion 420 may include a mounting plate connected to an end of the moving member 200, and the mounting plate may have mounting holes 421 formed thereon, the mounting holes 421 being for cooperating with bolts and nuts to enable the mounting plate to be connected to the tractor or the trailer. The first connection part 410 may include a connection ring connected to an outer wall of the cylinder block 100 remote from the second connection part 420. The present disclosure does not limit the structure of the first connection portion 410 and the second connection portion 420, for example, in other embodiments, the first connection portion 410 and the second connection portion 420 may be configured to have the same structure, and specifically may be adaptively designed according to actual requirements of a vehicle type, so long as the connection function can be achieved.

According to a second aspect of the present disclosure there is provided a vehicle comprising a towing hook as described above, the vehicle being of any suitable type, such as a domestic vehicle, an engineering vehicle or a rail train. Since the vehicle has all the advantageous effects of the trailer hook, the description thereof is omitted.

In addition, referring to fig. 3, an embodiment of the disclosure further provides a trailer control system, including a trailer hook and a controller for controlling the trailer hook, where the trailer hook is the trailer hook, and the controller includes: the trailer control system has all the advantages of the trailer hook described above, and is not described here in detail.

In addition, in other embodiments, the trailer control system may further include a power module 1400 for powering the collection module 1100, the processing module 1200, and the coil drive module 1300, where the power module 1400 may draw power from the vehicle (tractor or trailer) or may be a stand-alone power source.

For facilitating an understanding of the principles of operation of the trailer hitch and trailer control system described above, reference will be made to fig. 1-2, in which a tractor is connected to a first connection and a trailer is connected to a second connection (both tractor and trailer are described above and not explained here). In the description of the "compression" and "stretching" of the elastic member 300 in the afternoon, the tendency to change is based on the state before the change in length of the elastic member 300, for example, in the process of changing the elastic member 300 from one stretched state to another stretched state, if the degree of stretching becomes smaller, the elastic member is considered to be "compressed", and conversely, considered to be "stretched".

1. Vehicle start/acceleration state.

When the tractor is connected with the trailer through the trailer hook, the tractor is ready to start, the collecting module 1100 collects the accelerator signal of the tractor, the processing module 1200 generates a control signal according to whether the accelerator is stepped on or not, and the depth of the accelerator pedal, and outputs the control signal to the coil driving module 1300. Specifically:

when the collecting module 1100 obtains that the signal is a fast deep stepping signal of the accelerator of the tractor, the processing module 1200 transmits the signal of fast decreasing current to the coil driving module 1300, the coil driving module 1300 outputs the fast decreasing current to the coil 500, and when the current of the coil 500 decreases to a predetermined value, the processing module 1200 stops outputting the signal. The coil 500 generates a rapidly weakened electromagnetic field due to the action of the current, and the molecules of the magnetic fluid are arranged in disorder, so that the damping value is reduced. Under the action of the tractor, the distance between the first connecting portion 410 and the piston head 220 is gradually increased, because the damping of the magnetic fluid is reduced, the elastic member 300 is rapidly compressed and plays a role of buffering and damping in cooperation with the damping of the magnetic fluid, thereby reducing the rigid impact generated during the rapid starting process.

When the collecting module 1100 obtains that the signal is a signal that the accelerator of the tractor is slowly stepped down, the processing module 1200 transmits the signal that the current is slowly reduced to the coil driving module 1300, the coil driving module 1300 outputs the slowly reduced current to the coil 500, and when the current of the coil 500 is reduced to a predetermined value, the processing module 1200 stops outputting the signal. The coil 500 generates a slowly varying electromagnetic field due to the action of the current, and the molecules of the magnetic fluid tend to be disordered under the action of the weak electromagnetic field. Under the action of the tractor, the distance between the first connecting part 410 and the piston head 220 is slowly increased, because the change of the magnetic fluid damping is slower, the compression speed of the elastic piece 300 is slower, and the damping of the magnetic fluid is matched, so that the effect of buffering and damping is achieved, and the rigid impact generated in the slow starting process is reduced, and the tractor drives the trailer to stably start.

2. And the vehicle is in a constant-speed running state.

When the tractor is connected with the trailer through the trailer hook and runs at a constant speed, the collecting module 1100 has no signal input, and the processing module 1200 generates a control signal for outputting a stable small current to the coil driving module 1300 when the processing module 1200 does not receive the processing signal, and the coil driving module 1300 generates a small current to the coil 500. The coil 500 is weak in electromagnetic field due to the action of small current, and the molecules of the magnetic fluid tend to be disordered. In the process of driving the trailer by the tractor, the distance between the tractor and the trailer actually fluctuates in a certain range because the absolute constant speed cannot be ensured all the time in the driving process of the tractor, and the elastic piece 300 can gradually recover to a free state in the moving process of the trailer and the tractor because the magnetic fluid damping is small at the moment so as to provide a compression or stretching space for the next sudden braking or acceleration. It should be noted that the value of the small current is not particularly limited, and may be adaptively designed according to practical situations, and in some embodiments, may be 0.

3. Vehicle braking/deceleration state (trailer braking force).

When the tractor is connected to the trailer through the trailer hook and is ready to brake, the collection module 1100 collects the tractor brake signal, the trailer harness signal containing information about the trailer brake, the processing module 1200 generates a control signal based on whether there is a trailer harness signal, whether the tractor is stepping on the brake, and the depth of the brake pedals of the tractor and the trailer, and outputs the control signal to the coil drive module 1300. Specifically:

when there is a trailer harness signal and the trailer brake pedal is stepped on rapidly, the processing module 1200 transmits a signal of a rapid increase in current to the coil driving module 1300, the coil driving module 1300 outputs the rapidly increased current to the coil 500, and when the current of the coil 500 reaches a predetermined value, the processing module 1200 stops outputting the signal. The coil 500 tends to be orderly arranged (damping becomes large) due to the increase of the current, the enhancement of the electromagnetic field, and the enhancement of the magnetic fluid molecules due to the electromagnetic field. Because of the braking force of the trailer, the distance between the first connecting portion 410 and the piston head 220 increases, but because the magnetic fluid damping increases, the elastic member 300 compresses slowly, so that the tractor can be driven to brake quickly, in which case, although the elastic member 300 compresses slowly, there is still a certain buffering and damping effect compared with the rigid connection. It should be noted that during this process, the tractor itself may also be braked, i.e. the trailer may assist the tractor in rapid braking.

When there is a trailer harness signal and the trailer brake pedal is slowly stepped on, the processing module 1200 transmits a slowly increasing current signal to the coil drive module 1300, the coil drive module 1300 outputs the slowly increasing current to the coil 500, and when the current of the coil 500 increases to a predetermined value, the processing module 1200 stops outputting the signal. The coil 500 generates a stronger electromagnetic field due to the action of the current, and magnetic fluid molecules gradually tend to be orderly. Under the action of the trailer, the first connecting portion 410 increases in distance from the piston head 220, and the elastic member 300 begins to compress, but because of the increase in magnetic fluid damping, the compression of the elastic member 300 is slower (compression is faster when stepping relatively deep) thereby assisting in braking the tractor, in which case there is still some cushioning and shock absorbing effect compared to a rigid connection. Similar to deep stepping, the tractor itself may also brake during this process, i.e. the trailer may assist in the braking of the tractor.

4. Vehicle braking/deceleration state (trailer without braking force).

When the tractor is connected with the trailer through the trailer hook and is ready for braking, the collecting module 1100 collects the tractor braking signals and the trailer harness signals, and the processing module 1200 generates control signals according to whether the tractor is stepping on the brake and the depth of the brake pedal and outputs the control signals to the coil driving module 1300. Specifically:

when there is no trailer harness signal (i.e., the trailer is not braked) and there is a rapid deep-step signal of the tractor brake pedal, the processing module 1200 delivers a rapid decrease in current signal to the coil drive module 1300, the coil drive module 1300 outputs the rapid decrease in current to the coil 500, and the processing module 1200 stops outputting the signal when the current of the coil 500 decreases to a predetermined value. As the current of the coil 500 decreases, the electromagnetic field decreases and the magnetic fluid molecules tend to disorder as a result of the weakening of the electromagnetic field. The first connection portion 410 is spaced from the piston head 220 by a reduced distance due to the braking force of the tractor, but the elastic member 300 is rapidly stretched due to reduced magnetic fluid damping, so that the instant braking force can be effectively buffered, and rigid impact can be avoided.

When there is no trailer harness signal (no trailer braking) and there is a slow deep-stepping signal of the tractor brake pedal, the processing module 1200 transmits a slow-decreasing current signal to the coil driving module 1300, the coil driving module 1300 outputs the slow-decreasing current to the coil 500, and when the current of the coil 500 decreases to a predetermined value, the processing module 1200 stops outputting the signal. The coil 500 generates a weakening electromagnetic field due to the action of the current, and the magnetic fluid molecules gradually tend to be disordered. Under the action of the tractor, the distance between the first connecting part 410 and the piston head 220 is slowly reduced, and the elastic member 300 is slowly stretched, so that the braking force can be effectively buffered due to the reduction of the magnetic fluid damping, and the rigid collision is avoided.

Finally, it should be explained that the above-mentioned rigid impact may be an impact between the piston head 220 and the cylinder body 100, an impact between the first connecting portion 410, the second connecting portion 420 and the trailer or the tractor, or an impact between the magnetic fluid and the piston head 220, and in summary, all rigid impacts including those during movement, due to the magnetic fluid and the elastic member 300, the damping effect is obvious in all states of the driving as compared with the pure rigid connection.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (10)

1. A trailer coupler, comprising:

the cylinder body is provided with a first connecting part;

the moving part at least partially stretches into the cylinder body and can move along the axial direction of the cylinder body, one end of the moving part, which is positioned outside the cylinder body, is provided with a second connecting part, one of the second connecting part and the first connecting part is used for being connected with a trailer, and the other connecting part is used for being connected with a tractor; and

an elastic member elastically connected between the cylinder and the moving member,

the cylinder body is internally provided with magnetic fluid, and the magnetic fluid is used for generating damping force on the moving part.

2. The trailer hook of claim 1, further comprising a coil disposed inside the cylinder for controlling damping of the magnetic fluid upon energization.

3. The trailer hook of claim 2, wherein the moving member comprises a pull rod and a piston head coupled to an end of the pull rod that extends into the cylinder, wherein,

the coil is arranged inside the piston head; or alternatively, the process may be performed,

the trailer hook also comprises a mounting shaft with one end fixed on the inner wall of the cylinder body, and the coil is wound on the mounting shaft.

4. A trailer hook according to claim 3, wherein the outer circumferential surface of the piston head abuts against the inner wall of the cylinder, and a channel is provided in the piston head for communicating the magnetic fluid at both ends of the piston head.

5. A trailer hook as claimed in claim 3 or 4, wherein said resilient member is a coil spring which is sleeved on said pull rod, one end of said coil spring being connected to said pull rod or said piston head, and the other end being connected to said cylinder.

6. A trailer hook as claimed in claim 3 or 4, wherein the side wall of the cylinder body is provided with an opening, the opening is provided with a mounting seat for fixing the pull rod, the pull rod passes through the mounting seat and extends into the cylinder body, and a sealing ring is arranged between the mounting seat and the pull rod.

7. A trailer hook as claimed in claim 3 or 4, wherein the inner wall of the cylinder is provided with a first stop and a second stop spaced apart from each other in the axial direction of the cylinder, the piston head being trapped between the first stop and the stop.

8. The trailer hook as claimed in claim 7, wherein the first stop comprises two first protrusions symmetrically disposed on the inner wall of the cylinder and the second stop comprises two second protrusions symmetrically disposed on the inner wall of the cylinder.

9. The trailer hook as claimed in claim 1, wherein the second connection portion comprises a mounting plate connected to an end of the moving member, the mounting plate having a mounting hole formed therein; the first connecting portion comprises a connecting ring connected to the outer wall of the cylinder body far away from the second connecting portion.

10. A vehicle comprising a towing hook as claimed in any one of claims 1 to 9.

Images