CN219686995U - Trailer coupling - Google Patents

Abstract

The utility model discloses a trailer coupler which solves the technical problem that the structure of the trailer coupler is complex in the prior art, and comprises a mounting seat, a trailer coupler and an unlocking device, wherein the trailer coupler comprises a connecting part, the mounting seat comprises a seat body, the seat body is provided with a mounting cavity with an open lower end, the connecting part is vertically inserted into the mounting cavity, the mounting seat further comprises a locking piece and a rotating shaft, the top of the mounting cavity is provided with a mounting mouth, the inner wall of the mounting cavity is provided with a limiting surface, the locking piece is arranged in the mounting cavity through the mounting mouth, the rotating shaft penetrates through the mounting cavity and the locking piece, the connecting part is provided with a locking groove, the locking piece is downwards rotated and clamped into the locking groove and is propped against the limiting surface to lock the connecting part in the mounting cavity, and the unlocking device drives the locking piece to upwards rotate and separate from the locking groove so as to release the locking of the connecting part, and the connecting part is detached from the mounting cavity.

Description

Trailer coupling

[ field of technology ]

The utility model relates to the technical field of automobiles, in particular to a trailer coupler.

[ background Art ]

Along with the continuous change of people's life style, more and more people have more demands on the mounting performance of automobiles, and the current automobile is widely adopted is fixed trailer hook, and the trailer hook is connected to the bearing structure of automobile directly or indirectly through the adaptation chassis, and this kind of mounting means has the problem: because the hook part of the trailer hook is permanently extended out of the rear bumper, the aesthetic appearance of the automobile is reduced, the safety function of the rear bumper of the automobile is weakened, potential safety hazards are caused to users, in addition, other vehicles can be damaged when the trailer hook is extended out of the rear bumper, and economic loss is brought to the users.

To overcome the above drawbacks, prior art US20190070917A1 discloses a vehicle trailer hitch assembly comprising a first body provided with a receiving cavity and a locking mechanism, the first body being fixedly connected to a vehicle, the second body being configured to be operatively connected to a tail structure, and a second body (a hitch) removably inserted into the receiving cavity, the locking mechanism comprising a handle, a biasing element, a rotating member and a lock, wherein the rotating member extends through the receiving cavity and is rotatable between an unlocked position and a locked position, a first portion of the second body comprising a first contact surface and a recess located below the first contact surface, the rotating member comprising a second contact surface. The first contact surface enables the first portion of the second body to move into and out of engagement with the first body. In operation, the rotating handle rotates the rotating member such that the second contact surface of the rotating member is parallel to the first contact surface of the second body, with the rotating member in the unlocked position, and then the first portion of the second body is inserted into the receiving cavity, the first contact surface of the second body is slidable into contact with the second contact surface of the rotating member, and then the torsion spring drives the rotating member to rotate back such that the second contact surface is offset from the first contact surface and into the recess to effect locking of the second body to the first body by the rotating member, with the rotating member in the locked position. When the second main body needs to be disassembled, the rotary member is rotated to enable the second contact surface to be parallel to the first contact surface of the second main body, and at the moment, the rotary member is in an unlocking position, so that the second main body is unlocked, and the second main body is pulled downwards to be disassembled for storage, so that the problems are avoided.

When the second main body is heavy and receives downward pulling force, the rotating member can rotate to an unlocking position under the driving of the top of the concave part, so that the second main body (the trailer hook) falls off, and the rotating member in the comparison document needs to be locked through the lock at the locking position so as to avoid the rotating member from rotating, thereby leading to more parts of the locking mechanism and more complex assembly.

[ utility model ]

The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide the trailer coupler, so that the structure of the trailer coupler can be effectively simplified, and the assembly efficiency of the trailer coupler can be improved.

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

the trailer connector comprises a mounting seat, a trailer hook and an unlocking device, wherein the trailer hook comprises a connecting part, the mounting seat comprises a seat body, the seat body is provided with a mounting cavity with an open lower end, the connecting part is vertically inserted into the mounting cavity, the mounting seat further comprises a locking piece and a rotating shaft, the top of the mounting cavity is provided with a mounting port, the inner wall of the mounting cavity is provided with a limiting surface, the locking piece passes through the mounting port and is filled into the mounting cavity, the rotating shaft penetrates through the mounting cavity and the locking piece, the connecting part is provided with a locking groove, the locking piece downwards rotates and is clamped into the locking groove and abuts against the limiting surface to lock the connecting part in the mounting cavity, and the unlocking device drives the locking piece to upwards rotate and separate from the locking groove so as to unlock the connecting part from the mounting cavity.

In the trailer coupler, the rotating shaft is mounted on the base body, the locking piece is rotatably sleeved on the rotating shaft, the unlocking device comprises an unlocking ejector rod and a manual operation assembly, the unlocking ejector rod is vertically and slidably mounted on the connecting portion, and the manual operation assembly drives the unlocking ejector rod to move upwards and extend into the mounting cavity so as to push the locking piece to rotate upwards.

In the trailer coupler, a torsion spring sleeved on the rotating shaft is further arranged in the mounting cavity and used for driving the locking piece to rotate and reset so as to be clamped into the locking groove.

In the trailer coupler, the torsion spring is provided with two torsion legs, the locking piece is provided with a first inserting part, the rotating shaft is provided with a second inserting part, one torsion leg is inserted with the first inserting part, and the other torsion leg is inserted with the second inserting part.

In the trailer coupler, the rotating shaft is provided with a holding end, a positioning lug is convexly arranged on the outer peripheral side of the holding end, the base body is provided with a first through hole for the rotating shaft to penetrate through and a positioning part arranged on the outer periphery of the first through hole, and when the rotating shaft sleeved with the torsion spring is inserted on the base body, the positioning lug corresponds to the positioning part, so that the other torsion pin is inserted with the first inserting part preassembled in the mounting cavity.

In the trailer coupler, the base is further provided with a limiting groove located at the periphery of the first through hole, the positioning lug is inserted into the limiting groove to twist the torsion spring, and the locking piece abuts against the limiting surface under the torsion force of the torsion spring.

In the trailer coupler, the rotating shaft is rotatably mounted on the base, the locking piece and the rotating shaft rotate synchronously, the unlocking device comprises a driving piece connected with the rotating shaft, and the driving piece drives the rotating shaft to drive the locking piece to rotate.

In the trailer coupling, the mounting seat further comprises an upper cover plate, and the upper cover plate is mounted on the seat body to seal and shade the mounting opening.

In the trailer coupler, the locking piece elastically floats along the axial direction of the rotating shaft, the locking piece comprises a sector plate, the cambered surface of the sector plate is a first conical cambered surface, the locking groove is provided with a second conical cambered surface matched with the first conical cambered surface, and the first conical cambered surface and the second conical cambered surface are contacted through the elastic floating of the locking piece to lock the connecting part.

In the trailer coupler, the locking piece further comprises a fool-proof boss, the fool-proof boss is convexly arranged on one side sector of the sector plate, the mounting opening comprises a main opening and a fool-proof opening, the sector plate is arranged in the mounting cavity through the main opening, and the fool-proof boss is arranged in the mounting cavity through the fool-proof opening.

The utility model has the beneficial effects that:

the inner wall of the installation cavity is provided with the limiting surface positioned below the locking piece, the connecting part is provided with the locking groove, the locking piece is downwards rotated to be clamped into the locking groove and is propped against the limiting surface to lock the connecting part in the installation cavity, the unlocking device drives the locking piece to upwards rotate to be separated from the locking groove so as to unlock the connecting part, thus, the locking piece can be prevented from downwards rotating when in a locking state by the limiting surface, the condition that the locking piece is driven to downwards rotate under the action of self gravity or under the action of external force pulling to be separated from the locking groove is avoided, namely, the condition that the towing hook falls off is avoided, and the locking reliability of the locking piece to the connecting part is improved; in addition, the design of the limiting surface is simpler, and a separate lock is not required to be arranged in the prior art to lock the locking piece or the rotating shaft so as to prevent the locking piece or the rotating shaft from rotating downwards, so that the structure of the mounting seat is further simplified, namely, the structure of the trailer coupler is simplified, and the assembly efficiency of the trailer coupler is improved; finally, when the mounting seat is assembled, the locking piece is firstly arranged in the mounting cavity through the mounting opening and is erected on the limiting surface for preset positioning, and then the rotating shaft penetrates through the mounting cavity and the locking piece, so that the mounting seat is simple in structure and convenient to assemble, and the assembly efficiency of the trailer coupler is further improved.

The pivot is installed on the pedestal, and locking piece rotates the cover dress in the pivot, and unlocking device includes unblock ejector pin and manual operating assembly, and the vertical slidable mounting of unblock ejector pin is on connecting portion, and manual operating assembly drive unblock ejector pin upwards moves and stretches into the installation cavity in order to promote locking piece upwards to rotate. Compared with an electric unlocking device, the manual unlocking device has the advantages that the structure of the unlocking device is simpler, the assembly of the trailer hook is facilitated, the assembly efficiency of the trailer hook is improved, and the problem that the trailer hook cannot be disassembled and assembled due to electric faults can be solved.

And a torsion spring sleeved on the rotating shaft is also arranged in the mounting cavity and used for driving the locking piece to rotate and reset so as to be clamped into the locking groove. By means of the design, after the connecting portion is inserted in place, the locking piece can be clamped into the locking groove in a rotating mode under the action of the elastic force of the torsion spring, other complex structures are not required to be additionally arranged to drive the locking piece to rotate and reset, only one torsion spring is required to be added, and therefore the structure of the mounting seat and the trailer coupler is simplified, and the assembly efficiency of the trailer coupler is improved.

The torsion spring is provided with two torsion legs, a first plug-in connection part is arranged on the locking piece, a second plug-in connection part is arranged on the rotating shaft, one torsion leg is plugged with the first plug-in connection part, and the other torsion leg is plugged with the second plug-in connection part. By the design, the torsion spring can be conveniently assembled, the assembling difficulty of the mounting seat is further reduced, and the assembling efficiency of the mounting seat is improved.

The pivot has the end of gripping, and the periphery side of gripping is protruding to be equipped with the location lug, and the pedestal is equipped with the first perforation that supplies the pivot to run through and locates the location portion of first perforation periphery, and the pivot cartridge that is equipped with the torsional spring is when on the pedestal, and the location lug corresponds with location portion to make another turn round the foot and peg graft with the first grafting portion of preassembling in the installation cavity. By means of the design, when the rotating shaft is dismounted on the seat body, the positioning lugs correspond to the positioning parts, the other torsion feet can be smoothly inserted into the first inserting part positioned in the mounting cavity, so that the assembly difficulty of the torsion spring and the first inserting part is reduced, and the assembly efficiency of the mounting seat is improved.

The seat body is also provided with a limiting groove positioned at the periphery of the first perforation, the positioning lug is inserted into the limiting groove to twist the torsion spring, and the locking piece is propped against the limiting surface under the twisting force of the torsion spring. By the design, the rotary shaft can be prevented from rotating relative to the base body through the cooperation of the positioning lug and the limiting groove, and noise generated by collision of the locking piece with the wall part of the mounting cavity due to shaking after the trailer hook is disassembled can be prevented.

The mounting seat also comprises an upper cover plate, and the upper cover plate is mounted on the seat body to seal and shade the mounting opening. By the design, the upper cover plate seals and shields the mounting port, dust and water prevention is realized, and the phenomenon that the locking piece is turned to be invalid due to foreign matters in the mounting cavity is avoided, so that the disassembly and assembly of the trailer hook are affected.

The locking piece elastically floats along the axial direction of the rotating shaft, the locking piece comprises a sector plate, the cambered surface of the sector plate is a first conical cambered surface, the locking groove is provided with a second conical cambered surface matched with the first conical cambered surface, and the first conical cambered surface and the second conical cambered surface are contacted through the elastic floating of the locking piece to lock the connecting part. When the locking piece is clamped into the locking groove, if the locking piece and the locking groove are in clearance fit or interference fit due to the influence of manufacturing tolerance, the locking piece can move along the axis of the rotating shaft under the action of the second locking surface, and the first conical arc surface and the second conical arc surface are inclined relative to the axis of the rotating shaft, so that the movement of the locking piece can promote the first conical arc surface and the second conical arc surface to achieve contact, namely, the first conical arc surface and the second conical arc surface achieve zero clearance fit, so that the connecting part is locked to prevent the connecting part from swinging up and down, and the mounting performance of the trailer coupler is improved; in addition, the design can also reduce the manufacturing precision of the locking piece and the locking groove, thereby reducing the manufacturing cost and improving the economic benefit.

The locking piece further comprises a fool-proof boss, the fool-proof boss is convexly arranged on one side sector of the sector plate, the mounting opening comprises a main opening and a fool-proof opening, the sector plate is arranged in the mounting cavity through the main opening, and the fool-proof boss is arranged in the mounting cavity through the fool-proof opening. By the design, the situation that the first conical arc surface and the second conical arc surface cannot be matched due to reverse installation of the locking piece can be avoided, and then the trailer hook cannot be assembled on the mounting seat is avoided, reworking caused by misloading is avoided, and the assembly efficiency of the mounting seat and the trailer coupler is improved.

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 a trailer coupling mounted to a vehicle body in accordance with a first embodiment of the present utility model;

FIG. 2 is an exploded view of a mounting base according to a first embodiment of the present utility model;

FIG. 3 is an exploded view of a portion of a mounting seat according to a first embodiment of the present utility model;

FIG. 4 is a cross-sectional view of a housing in accordance with an embodiment of the present utility model;

FIG. 5 is an exploded view of a trailer hook according to a first embodiment of the present utility model;

FIG. 6 is a partial cross-sectional view of a connecting portion in accordance with a first embodiment of the present utility model;

FIG. 7 is a cross-sectional view of the locking member locking the connection portion in the mounting cavity according to the first embodiment of the present utility model;

FIG. 8 is a cross-sectional view of A-A of FIG. 7;

FIG. 9 is a cross-sectional view of B-B of FIG. 7;

fig. 10 is a cross-sectional view of the first embodiment of the present utility model when the locking member is disengaged from the locking groove.

Reference numerals:

001. an anti-collision beam; 002. a connecting plate; 100. a mounting base; 110. a base; 111. a mounting cavity; 1111. a limiting surface; 112. a first perforation; 113. a second perforation; 114. a mounting port; 1141. a main opening; 1142. fool-proof mouth; 115. a positioning part; 116. a limit groove; 117. a groove; 120. a locking member; 121. a first conical arc surface; 122. a first plug-in connection; 123. an avoidance groove; 124. fool-proof boss; 130. a rotating shaft; 131. a grip end; 132. an insertion end; 133. a second plug-in connection; 134. positioning lugs; 140. a torsion spring; 141. twisting feet; 150. an upper cover plate; 160. a sealing cap; 170. lifting the ejector rod; 200. a trailer hook; 210. a hooking part; 220. a connection part; 2201. a locking groove; 22010. a second conical arc surface; 221. a main body; 2210. a cavity; 222. a plugging plate; 223. inserting blocks; 230. unlocking the ejector rod; 240. a manual operation assembly; 241. a knob; 242. a cam; 243. and a cam rotating shaft.

[ detailed description ] of the utility model

The utility model provides a trailer coupler, which comprises a mounting seat, a trailer coupler and an unlocking device, wherein the trailer coupler comprises a connecting part, the mounting seat comprises a seat body, the seat body is provided with a mounting cavity with an open lower end, the connecting part is vertically inserted into the mounting cavity, the mounting seat further comprises a locking piece and a rotating shaft, the top of the mounting cavity is provided with a mounting port, the inner wall of the mounting cavity is provided with a limiting surface, the locking piece is arranged in the mounting cavity through the mounting port, the rotating shaft penetrates through the mounting cavity and the locking piece, the connecting part is provided with a locking groove, the locking piece is downwards rotated and clamped into the locking groove and is propped against the limiting surface to lock the connecting part in the mounting cavity, and the unlocking device drives the locking piece to upwards rotate and separate from the locking groove so as to unlock the connecting part from the mounting cavity.

The inner wall of the installation cavity is provided with the limiting surface positioned below the locking piece, the connecting part is provided with the locking groove, the locking piece is downwards rotated to be clamped into the locking groove and is propped against the limiting surface to lock the connecting part in the installation cavity, the unlocking device drives the locking piece to upwards rotate to be separated from the locking groove so as to unlock the connecting part, thus, the locking piece can be prevented from downwards rotating when in a locking state by the limiting surface, the condition that the locking piece is driven to downwards rotate under the action of self gravity or under the action of external force pulling to be separated from the locking groove is avoided, namely, the condition that the towing hook falls off is avoided, and the locking reliability of the locking piece to the connecting part is improved; in addition, the design of the limiting surface is simpler, and a separate lock is not required to be arranged in the prior art to lock the locking piece or the rotating shaft so as to prevent the locking piece or the rotating shaft from rotating downwards, so that the structure of the mounting seat is further simplified, namely, the structure of the trailer coupler is simplified, and the assembly efficiency of the trailer coupler is improved; finally, when the mounting seat is assembled, the locking piece is firstly arranged in the mounting cavity through the mounting opening and is erected on the limiting surface for preset positioning, and then the rotating shaft penetrates through the mounting cavity and the locking piece, so that the mounting seat is simple in structure and convenient to assemble, and the assembly efficiency of the trailer coupler is further improved.

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. In addition, it is to be understood that the terms "upper," "lower," "left," "right," "longitudinal," "transverse," "inner," "outer," "vertical," "horizontal," "top," "bottom," and the like, which refer to an orientation or positional relationship, are merely based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices/elements referred to must have a specific orientation or be configured and operated in a specific orientation, and thus are not to be construed as limiting the present utility model.

Example 1

Referring to fig. 1 to 10, the trailer coupling in this embodiment includes a mounting seat 100, a trailer hook 200 and an unlocking device, the mounting seat 100 is fixedly connected to a connection plate 002 of an anti-collision beam 001 through a screw, the mounting seat 100 includes a seat body 110, a mounting cavity 111 is provided in the seat body 110, a socket is formed by opening the lower end of the mounting cavity 111, the trailer hook 200 includes a hook portion 210 and a connecting portion 220, the hook portion 210 is L-shaped, the connecting portion 220 is detachably connected with a transverse section of the hook portion 210 or integrally formed, the connecting portion 220 extends vertically upwards and is inserted into the mounting cavity 111 through the socket, the mounting seat 100 further includes a locking member 120 and a rotating shaft 130, the locking member 120 is sleeved on the rotating shaft 130 and can rotate, a mounting port 114 is provided at the top of the mounting cavity 111, a limit surface 1111 is provided on the inner wall of the mounting cavity 111, the locking member 120 is installed into the mounting cavity 111 through the mounting port 114, the rotating shaft 130 penetrates through the mounting cavity 111 and the locking member 120, the connecting portion 220 is provided with a locking groove 2201, the locking member 120 rotates downwards and is clamped into the locking groove 2201 and abuts against the limit surface 1111 to lock the connecting portion 220 so as to release the locking member 220 from the mounting cavity 120, and the locking device is unlocked to release the locking member 220 from the locking device from the mounting cavity 120.

According to the utility model, the locking piece 120 can be prevented from rotating downwards when being in a locking state by the limiting surface 1111, so that the condition that the locking piece 120 is driven to rotate downwards under the action of self gravity or external force pulling to separate from the locking groove 2201 is avoided, namely the condition that the locking piece 200 falls off is avoided, and the locking reliability of the locking piece 120 to the connecting part 220 is improved; in addition, the design of the limiting surface 1111 is simpler, and a separate lock is not required to be arranged in the prior art to lock the locking piece 120 or the rotating shaft 130 so as to prevent the locking piece or the rotating shaft from rotating downwards, so that the structure of the mounting seat 100 is further simplified, namely, the structure of the trailer coupler is simplified, and the assembly efficiency of the trailer coupler is improved; finally, when the mounting seat 100 in this embodiment is assembled, the locking member 120 is first installed into the mounting cavity 111 through the mounting opening 114 and is set up on the limiting surface 1111 to perform the pre-positioning, and then the rotating shaft 130 penetrates through the mounting cavity 111 and the locking member 120, so that the structure is simple, the assembly is convenient, and the assembly efficiency of the trailer coupler is further improved.

Specifically, as shown in fig. 2 to 4, in this embodiment, the locking member 120 is a fan-shaped plate, the locking groove 2201 is an arc-shaped groove, two opposite sides of the base 110 are respectively provided with a first through hole 112 and a second through hole 113 which are coaxially arranged, the first through hole 112 and the second through hole 113 are communicated with the mounting cavity 111, the rotating shaft 130 is provided with a holding end 131 and an insertion end 132, wherein the first through hole 112 corresponds to the holding end 131, the aperture of the first through hole 112 is smaller than the outer diameter of the holding end 131, the outer diameter of the insertion end 132 is smaller than the aperture of the second through hole 113, the rotating shaft 130 sequentially penetrates through the first through hole 112, the mounting cavity 111 and the second through hole 113, the insertion end 132 is sleeved with a circlip, and the circlip is larger than the aperture of the second through the holding end 131 and the circlip, so that the rotating shaft 130 is axially limited on the base 110. The locking piece 120 is rotatably sleeved at the position of the rotating shaft 130 in the mounting cavity 111, so that the locking piece 120 is rotatably mounted in the mounting cavity 111.

In addition, a torsion spring 140 is further disposed in the mounting cavity 111 of the embodiment, the torsion spring has two torsion legs 141, a fan-shaped surface of the locking member 120 facing one side of the first through hole 112 is provided with a first insertion portion 122, the first insertion portion 122 is a tapered countersunk hole, the rotating shaft 130 includes a shaft body and a limiting plate disposed at one end of the shaft body, the outer diameter of the limiting plate is larger than that of the shaft body, the limiting plate forms the holding end 131, the other end of the shaft body forms an insertion end 132, a boss between the outer diameters of the shaft body and the holding end 131 is disposed between the shaft body and the holding end 131, the boss is provided with a second insertion portion 133, the second insertion portion 133 extends along an axis of the shaft body, the torsion spring 140 is sleeved on the shaft body, one torsion leg 141 and the other torsion leg are inserted into the tapered countersunk hole, so that the restoring force of the torsion spring 140 drives the locking member 120 to rotate and reset to be clamped into the locking groove 2201, and no additional complicated structure is required to drive the locking member 120 to rotate and reset, only one torsion spring 140 is required to be added, thereby simplifying the structure of the mounting seat 100 and the coupler, and improving efficiency of the coupler; in addition, by the design, the first inserting portion 122 and the second inserting portion 133 are also convenient for assembling the torsion spring 140, so that the assembling difficulty of the mounting seat 100 is further reduced, and the assembling efficiency of the mounting seat 100 is improved.

In order to facilitate assembly of the mounting seat 100, a positioning portion 115 and a limiting groove 116 are disposed at an outer side Zhou Juzhou of the first through hole 112 and spaced apart from each other, the positioning portion 115 is a positioning blind hole or a positioning protruding point, preferably a positioning blind hole, a positioning protruding lug 134 is disposed on an outer periphery of the limiting plate, and the limiting surface 1111 is located right below the mounting opening 114 and extends obliquely downward toward the locking groove 2201. The mount pad 100 still includes through the upper cover plate 150 that the screw was installed in order to shelter from the mount pad 114 at mount pad 110 top, is equipped with sealed pad between upper cover plate 150 and the mount pad 110 to reach sealed shield mount pad 114, realize dustproof waterproof effect, avoid the existence of foreign matter in the installation cavity 111 to lead to locking piece 120 to rotate inefficacy, and then influence the dismouting of trailer hook 200. A groove 117 is further formed on one side of the base 110, and the second through hole 113 is formed on a bottom wall of the groove 117.

When the mounting seat 100 is assembled, firstly, the locking piece 120 is mounted in the mounting cavity 111 through the mounting port 114, the radial side surface of the locking piece 120 is matched with the limiting surface 1111, the locking piece 120 is pre-positioned through the limiting surface 1111, the first inserting part 122 and the positioning part 115 are positioned on the same straight line, then, the nylon gasket, the sealing piece and the torsion spring 140 are sequentially sleeved on the rotating shaft 130, one torsion foot 141 of the torsion spring 140 is inserted into the second inserting part 133, at the moment, the positioning lug 134, the second inserting part 133 and the two torsion feet 141 are positioned on the same straight line, and then, the assembly is sequentially inserted on the seat body 110 through the first through hole 112, the locking piece 120 and the second through hole 113, and when the assembly is inserted, the positioning lug 134 on the rotating shaft 130 is aligned with the positioning part 115, so that the other torsion foot 141 of the torsion spring 140 can be smoothly inserted into the conical countersink hole along the guiding conical surface of the rotating shaft 130 when the rotating shaft 110 is penetrated through the seat body 110, at the moment, and the other torsion foot 141 of the torsion spring 140 is rotated again by an angle, so that the positioning lug 134 is embedded into the limiting groove 116, and the vibration of the rotating shaft 120 is prevented from being generated when the rotating the locking piece 120 is prevented from being closely attached to the lower than the rotating body 120, and the rotating body 120 is prevented from being mounted on the rotating against the rotating body 110, and the opposite to the side of the locking piece 120; then, the elastic retainer ring is clamped on the insertion end 132 of the rotating shaft 130 to fix the rotating shaft 130, so that the rotating shaft 130 is prevented from falling off; finally, the sealing cap 160 is inserted into the groove 117, and the upper cover plate 150 and the gasket are mounted on top of the seat body 110, thus completing the assembly of the mounting seat 100.

It should be noted that, two threaded blind holes are further formed on the sealing cover 160, when the sealing cover 160 needs to be disassembled, the screw is screwed on the sealing cover 160, and then the sealing cover 160 can be taken out from the groove 117 by pulling the screw outwards.

As shown in fig. 5 to 10, the connecting portion 220 in this embodiment includes a main body 221, a blocking plate 222 and an insert 223, wherein the insert 223 is integrally formed at the top of the main body 221, a cavity 2210 is provided in the main body 221, one side of the cavity 2210 has an opening, the unlocking device includes an unlocking push rod 230 and a manual operation assembly 240, the unlocking push rod 230 vertically slides through the top wall of the cavity 2210, and the manual operation assembly 240 includes a knob 241, a cam 242 and a cam rotating shaft 243, when assembling, the cam 242 is firstly mounted in the cavity 2210 through the opening, then the cam rotating shaft 243 penetrates through the cavity 2210 and the cam 242, one end of the cam rotating shaft 243 is defined at one side of the main body 221, the other end of the cam rotating shaft 243 is fixedly connected with the knob 241 located at the outer side of the connecting portion 220, wherein the cam 242 is provided with a non-circular hole, and the cam rotating shaft 243 has a non-circular section matched with the non-circular hole, so that synchronous rotation of the cam 242 and the cam rotating shaft 243 is realized, after assembling, the bottom end of the unlocking push rod 230 abuts against the cambered surface of the cam 242, and finally the blocking plate 222 is fixed on the main body 221 through a screw to block the opening, so that the assembling of the connecting portion 220 is completed. At this time, the knob 241 is rotated to drive the cam shaft 243 to drive the cam 242 to rotate synchronously, so that the unlocking ejector 230 can be driven to move upwards when the knob 241 drives the cam 242 to rotate upwards, and the unlocking ejector 230 moves downwards to reset under the action of gravity when the knob 241 drives the cam 242 to rotate downwards.

It should be noted that, in this embodiment, the top of the insert block 223 and the main body 221 form an avoidance space for avoiding the unlocking ejector rod 230, one side of the insert block 223 facing the avoidance space is partially recessed to form the locking groove 2201, in this embodiment, a part of the connecting portion 220 is inserted into the mounting cavity 111, that is, the insert block 223 is inserted into the mounting cavity 111, and the lock of the insert block 223 is achieved by the locking member 120 being clamped into the locking groove 2201, so that the unlocking ejector rod 230 can enter the avoidance space when moving upwards, so as to push the locking member 120 to rotate upwards.

In this embodiment, the locking member 120 is rotatably installed in the installation cavity 111, and the unlocking device is installed at the connection portion 220 of the trailer coupler 200, so that when the locking member 120 or the unlocking device needs to be maintained, only the installation seat 100 or the trailer coupler 200 needs to be detached separately; finally, the unlocking device is arranged on the trailer hook 200, and the unlocking device can be further away from the chassis, so that a user can conveniently operate the unlocking device, and the use experience of the user is improved.

When the trailer coupling in this embodiment is used, if the trailer coupling 200 needs to be assembled for hooking, firstly, the unlocking ejector 230 is ensured to be in a state of being moved downwards and reset, then the connecting part 220 is inserted into the installation cavity 111 through the insertion opening, in the process of being inserted into the installation cavity 111, the insertion block 223 can rotate upwards around the rotation shaft 130 against the locking part 120, when the connecting part 220 is assembled in place, the locking part 120 automatically resets under the torsion force of the torsion spring and is clamped into the locking groove 2201 so as to lock the connecting part 220 in the installation cavity 111, and the locking part 120 is propped against the limiting surface 1111 (as shown in fig. 7), so that the limiting surface 1111 can prevent the locking part 120 from rotating downwards when the locking part 120 is in a locking state, and the condition that the locking part 120 is driven to rotate downwards under the action of self gravity or external force pulling is avoided to be separated from the locking groove 2201, namely, the falling of the locking part 200 is avoided, and thus the locking reliability of the locking part 120 to the trailer coupling 220 is improved. If the trailer hook 200 needs to be disassembled for storage, the rotation knob 241 rotates the cam shaft 243 to drive the cam 242 to rotate upwards, so that the cam 242 drives the unlocking ejector 230 to move upwards, the unlocking ejector 230 enters the mounting cavity 111 and pushes the locking piece 120 to rotate upwards and separate from the locking groove 2201, so as to unlock the connecting portion 220 by the locking piece 120 (as shown in fig. 10), and at this time, the connecting portion 220 can be disassembled from the mounting cavity 111, so as to disassemble the trailer hook 200.

It will be appreciated that in other embodiments of the present utility model, a tension spring may be further disposed between the locking member and the limiting surface, where the tension spring is used to drive the locking member to rotate and reset to be clamped into the locking groove.

It will be appreciated that in other embodiments of the utility model, the cam shaft is coupled to the motor, and the cam shaft is driven by the motor to rotate the cam, so that the unlocking post rod moves upward to push the locking member to rotate upward and disengage from the locking slot.

Preferably, as shown in fig. 2 to 5, the locking member 120 in the present embodiment is slidably sleeved on the rotating shaft 130, the cambered surface of the locking member 120 forms a first conical cambered surface 121, the locking groove 2201 has a second conical cambered surface 22010, the inclination direction of the first conical cambered surface 121 and the inclination direction of the second conical cambered surface 22010 are the same, the axis of the first conical cambered surface 121, the axis of the second conical cambered surface 22010 and the axis coaxial with the rotation axis of the locking member 120 (i.e. the axis of the rotating shaft 130), the bus bars of the two conical cambered surfaces are obliquely arranged relative to the axis of the rotating shaft 130, the distance between the two conical cambered surfaces and the axis of the rotating shaft 130 gradually increases towards the direction approaching the first through hole 112, and the torsion spring 140 is a telescopic torsion spring, so that the locking member 120 can elastically float along the axial direction of the rotating shaft 130. When the locking member 120 is locked into the locking groove 2201, the first tapered arc surface 121 and the second tapered arc surface 22010 cooperate to lock the connecting portion 220 in the mounting cavity 111. After the locking member 120 is clamped into the locking groove 2201, if the locking member 120 and the locking groove 2201 are in clearance fit or interference fit due to the influence of manufacturing tolerance, the locking member 120 moves along the axis of the rotating shaft 130 under the combined action of the torsion spring 140 and the second conical arc surface 22010, and the first conical arc surface 121 and the second conical arc surface 22010 incline relative to the axis of the rotating shaft 130, so that the movement of the locking member 120 can promote the first conical arc surface 121 and the second conical arc surface 22010 to achieve contact, that is, the first conical arc surface 121 and the second conical arc surface 22010 achieve zero clearance fit, so that the locking connection part 220 prevents the connection part 220 from swinging up and down, thereby improving the mounting performance of the trailer coupler; in addition, the first conical arc surface 121 and the second conical arc surface 22010 are both conical arc surfaces, so that the first conical arc surface 121 and the second conical arc surface 22010 can be in surface contact, the contact area of the first conical arc surface 121 and the second conical arc surface 22010 is increased, the friction force between the locking piece 120 and the connecting portion 220 is further increased, and the locking effect on the connecting portion 220 is improved; finally, by such design, the manufacturing accuracy of the locking member 120 and the locking groove 2201 can be reduced, thereby reducing the manufacturing cost and improving the economic benefit.

It will be appreciated that in other embodiments of the present utility model, the distance between the two conical arc surfaces and the axis of the rotating shaft may also gradually decrease toward the direction close to the first perforation, so that the first conical arc surface and the second conical arc surface can be disposed obliquely with respect to the axis of the rotating shaft.

As shown in fig. 3, in order to avoid the reverse installation of the locking member 120, the locking member 120 in this embodiment further includes a fool-proof boss 124, the fool-proof boss 124 is convexly disposed on a sector of a sector plate facing the first through hole 112, the fool-proof boss 124 is sleeved outside the rotating shaft 130, the mounting opening 114 includes a main opening 1141 and a fool-proof opening 1142, the fool-proof opening 1142 is disposed on a side of the main opening 1141 facing the first through hole 112 and is communicated with the main opening 1141, when the locking member 120 is assembled, the sector plate is installed into the mounting cavity 111 through the main opening 1141, and the fool-proof boss 124 is installed into the mounting cavity 111 through the fool-proof opening 1142. By the design, the locking piece 120 can be prevented from being reversely assembled to cause the first conical arc surface 121 and the second conical arc surface 22010 to be incapable of being matched, so that the trailer hook 200 can not be assembled on the mounting seat 100, and therefore, the reworking caused by incorrect assembly is avoided, and the assembly efficiency of the mounting seat 100 and the trailer coupler is improved.

It will be appreciated that in other embodiments of the present utility model, the fool-proof boss may be further disposed on a fan surface of the fan-shaped plate facing the second through hole, and the fool-proof opening is disposed on a side of the main opening facing the second through hole and is in communication with the main opening.

Finally, as shown in fig. 2 and 8, in order to enable the unlocking ejector rod 230 to drive the locking member 120 to rotate upwards smoothly to separate from the locking groove 2201, the mounting seat 100 in this embodiment further includes two lifting ejector rods 170, the two lifting ejector rods 170 penetrate through the bottom wall of the groove 117 and then extend into the mounting cavity 111, the two lifting ejector rods 170 are symmetrically distributed on two sides of the second perforation 113, the sealing plug cover 160 also axially limits the lifting ejector rods 170 while shielding the two lifting ejector rods 170 so as to prevent the lifting ejector rods 170 from axially moving and falling off, two avoidance grooves 123 are further arranged on a sector of one side of the locking member 120, which faces the second perforation 113, the avoidance grooves 123 are arc-shaped grooves, and one end of the lifting ejector rods 170 extending into the mounting cavity 111 is a sphere surface. When the locking piece 120 is clamped into the locking groove 2201, the lifting ejector rod 170 is inserted into the avoidance groove 123, when the locking piece 120 rotates upwards, the lifting ejector rod 170 can be separated from the avoidance groove 123 and props against one side sector of the locking piece 120 towards the second perforation 113, so that the locking piece 120 is driven to move along the axial direction of the rotating shaft 130 towards the direction away from the lifting ejector rod 170 and at least partially located outside the locking groove 2201, the contact between the first conical arc surface 121 and the second conical arc surface 22010 is reduced, even the contact between the first conical arc surface 121 and the second conical arc surface 22010 is released, the contact area between the first conical arc surface 121 and the second conical arc surface 22010 is reduced, and the locking piece 120 is easy to separate from the locking groove 2201 when rotating, so that the trailer coupler 200 is more labor-saving to detach.

When the connecting portion 220 is locked in the mounting cavity 111 by the locking member 120, the connecting portion 220 is not completely locked and cannot move, and a play allowance is reserved between an inner wall of the mounting cavity 111 opposite to the locking member 120 and the connecting portion 220, and the reserved play allowance allows the locking member 120 to be pushed by the lifting ram 170 to axially shift, when the connecting portion 220 can be close to an inner wall of the mounting cavity opposite to the locking member 120, the contact between the first conical arc surface 121 and the second conical arc surface 22010 can be smoothly reduced. However, the reserved play allowance does not affect the normal engagement between the locking member 120 and the locking groove 2201.

It will be appreciated that in other embodiments of the present utility model, the avoidance groove may be further disposed on the inner wall of the installation cavity, and the lifting ejector rod is mounted on a fan surface of the fan-shaped plate facing the second perforation, so that when the locking member rotates, the locking member is forced to move axially away from the second perforation by the avoidance groove, so that the first conical arc surface 121 and the second conical arc surface 22010 reduce contact or even break away from contact.

Example two

Compared with the first embodiment, the present embodiment is different in that: the manual operation assembly comprises a shifting block and a spring, wherein the shifting block is vertically arranged on the connecting part in a sliding manner and is connected with the unlocking ejector rod, the shifting block penetrates through the wall part of the cavity, the shifting block is shifted upwards to enable the unlocking ejector rod to move upwards, and the spring is arranged between the unlocking ejector rod and the bottom wall of the cavity or between the unlocking ejector rod and the top wall of the installation cavity so as to drive the unlocking ejector rod to move downwards for resetting. When the trailer hook is required to be disassembled, the shifting block is pushed upwards to slide, the unlocking ejector rod can be made to move upwards to push the locking piece out of the locking groove, then the locking of the locking piece to the connecting part is released, after the disassembly is completed, the spring drives the unlocking ejector rod to move downwards to reset, and therefore the phenomenon that the unlocking ejector rod interferes with the locking piece to rotate downwards to enable the locking piece to be incapable of being clamped into the locking groove when the trailer hook is assembled with the mounting seat again is avoided.

Example III

Compared with the first and second embodiments, the present embodiment is different in that: the unlocking ejector rod is provided with a rack part, the manual operation assembly further comprises a gear and a knob, the gear is installed in the cavity and meshed with the tooth part, the knob is connected with the gear, the rotation knob drives the gear to rotate to drive the unlocking ejector rod to move up and down, when the trailer hook is required to be disassembled, the rotation knob drives the gear to rotate to drive the unlocking ejector rod to move upwards, then the locking piece is pushed to rotate upwards to separate from the locking groove, then the locking of the locking piece to the connecting part is released, after the disassembly is completed, the reverse rotation knob can enable the unlocking ejector rod to move downwards to reset, so that the unlocking ejector rod is prevented from interfering to the locking piece to rotate downwards to enable the locking piece to be incapable of being clamped into the locking groove when the trailer hook is assembled with the installation seat again.

Example IV

Compared with the first to third embodiments, the present embodiment is different in that: the unlocking device comprises an unlocking screw and an operating part fixedly connected to the lower end of the unlocking screw, wherein a threaded hole is formed in the connecting part, the unlocking screw is in threaded connection with the threaded hole, so that when the trailer hook is required to be disassembled, the unlocking screw can be moved upwards by rotating the operating part to push the locking piece to rotate upwards to be separated from the locking groove, the locking of the locking piece to the connecting part is further released, after the disassembly is completed, the unlocking screw can be moved downwards to reset by the reverse rotating operating part, and therefore the phenomenon that the trailer hook and the mounting seat are assembled again, the unlocking screw interferes to the locking piece to rotate downwards to enable the locking piece to be incapable of being clamped into the locking groove is avoided.

Example five

Compared with the first to fourth embodiments, the present embodiment is different in that: the rotating shaft is rotatably arranged on the seat body, the locking piece is provided with a non-circular hole, the rotating shaft is provided with a non-circular section matched with the non-circular hole, for example, the non-circular hole is a D-shaped hole or a rectangular hole, so that the locking piece and the rotating shaft can synchronously rotate, the unlocking device comprises a driving piece connected with the rotating shaft, the driving piece is a knob or a motor, the rotating knob or the motor can be operated to drive the rotating shaft to drive the locking piece to rotate, and the locking piece can be downwards rotated to be clamped into the locking groove to lock the connecting part or upwards rotated to be separated from the locking groove.

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 trailer connector comprises a mounting seat, a trailer hook and an unlocking device, wherein the trailer hook comprises a connecting part, the mounting seat comprises a seat body, the seat body is provided with a mounting cavity with an open lower end, the connecting part is vertically inserted into the mounting cavity, the trailer connector is characterized in that the mounting seat further comprises a locking piece and a rotating shaft, the top of the mounting cavity is provided with a mounting port, the inner wall of the mounting cavity is provided with a limiting surface, the locking piece is installed in the mounting cavity through the mounting port, the rotating shaft penetrates through the mounting cavity and the locking piece, the connecting part is provided with a locking groove, the locking piece is downwards rotated to be clamped into the locking groove and is propped against the limiting surface to lock the connecting part in the mounting cavity, and the unlocking device drives the locking piece to upwards rotate to be separated from the locking groove so as to unlock the connecting part from the mounting cavity.

2. The trailer coupling of claim 1, wherein the shaft is mounted on the housing, the locking member is rotatably mounted on the shaft, the unlocking means comprises an unlocking post vertically slidably mounted on the connecting portion, and a manual operating assembly driving the unlocking post to move upwardly into the mounting cavity to urge the locking member to rotate upwardly.

3. The trailer coupling of claim 2 wherein a torsion spring is also provided in said mounting cavity and is mounted around said axle for urging said locking member into rotational return for engagement in said locking slot.

4. A trailer coupling as claimed in claim 3 wherein said torsion spring has two torsion legs, a first spigot portion is provided on said locking member, a second spigot portion is provided on said shaft, one of said torsion legs being spigot with the first spigot portion and the other torsion leg being spigot with the second spigot portion.

5. The trailer coupling of claim 4, wherein the shaft has a gripping end, a positioning lug is provided on a peripheral side of the gripping end, the base is provided with a first through hole through which the shaft passes and a positioning portion provided on a periphery of the first through hole, and when the shaft sleeved with the torsion spring is inserted into the base, the positioning lug corresponds to the positioning portion, so that the other torsion pin is inserted into the first insertion portion preloaded into the mounting cavity.

6. The trailer coupling of claim 5, wherein the housing is further provided with a limiting groove at an outer periphery of the first through hole, the positioning lug being inserted into the limiting groove to twist the torsion spring, the locking member being abutted against the limiting surface by a twisting force of the torsion spring.

7. The trailer coupling of claim 1, wherein the shaft is rotatably mounted to the housing, the locking member rotates in synchronization with the shaft, and the unlocking means comprises a driving member coupled to the shaft, the driving member driving the shaft to rotate the locking member.

8. The trailer coupling of any one of claims 1-7, wherein the mounting base further comprises an upper cover plate mounted to the base body to sealingly conceal the mounting opening.

9. The trailer coupling as claimed in any one of claims 1 to 7, wherein said locking member is elastically floated in an axial direction of the rotary shaft, said locking member comprises a sector plate having a first tapered arc surface, said locking groove having a second tapered arc surface engaged with said first tapered arc surface, and said connecting portion is locked by bringing the first tapered arc surface and the second tapered arc surface into contact by elastic floating of said locking member.

10. The trailer coupling of claim 9, wherein said locking member further comprises a fool-proof boss protruding on a side sector of said sector plate, said mounting opening comprising a main opening through which said sector plate is received in said mounting cavity and a fool-proof opening through which said fool-proof boss is received in said mounting cavity.