CN219667892U - Trailer coupling - Google Patents

Abstract

The utility model discloses a trailer coupler which solves the technical problem that an unlocking device in the existing trailer coupler is complex to assemble.

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.

In order to overcome the above-mentioned shortcoming, a detachable trailer coupler is disclosed in the prior art, including a mounting seat, a trailer hook and an unlocking device, wherein a mounting cavity with an open lower end is arranged in the mounting seat, the trailer hook comprises a hook portion and a connecting portion, the connecting portion is inserted into the mounting cavity from bottom to top and is locked in the mounting cavity through a steel ball, and the unlocking device is used for driving the steel ball to act so as to unlock the connecting portion, so that the trailer hook can be detached from the mounting seat to be stored when the trailer hook is not needed, and the above-mentioned problems are avoided. The unlocking devices of the prior art are relatively complex to assemble, thereby reducing the assembly efficiency of the trailer coupling.

[ 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 assembly difficulty of the unlocking device can be effectively reduced, 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 coupler comprises a mounting seat, a trailer coupler and an unlocking device arranged on the trailer coupler, wherein a mounting cavity which is opened downwards is arranged in the mounting seat, the trailer coupler comprises a connecting part, the connecting part comprises a main body provided with a cavity, a plugging plate and a plugging block arranged at the top of the main body, the plugging block is inserted into the mounting cavity and locked in the mounting cavity through a locking piece, the unlocking device comprises a driving piece, a transmission piece and an unlocking ejector rod, the unlocking ejector rod vertically slides to penetrate through the top wall of the cavity, the cavity is provided with an opening, the transmission piece is arranged in the cavity through the opening, the plugging plate is arranged on the main body to plug the opening, and the driving piece drives the transmission piece to move so that the transmission piece drives the unlocking ejector rod to move upwards to release the locking of the locking piece, and the plugging block is detached from the mounting cavity.

In the trailer coupler, the driving piece comprises a knob and a cam rotating shaft, the driving piece is a cam, the cam rotating shaft penetrates through the cavity and the cam, and the knob is positioned on the outer side of the main body and connected with the cam rotating shaft to drive the cam rotating shaft and the cam to rotate synchronously.

In the trailer coupling described above, the cam is provided with a first non-circular aperture, and the cam shaft has a non-cylindrical section that mates with the first non-circular aperture.

In the trailer coupler, the inner side surface of the plugging plate is provided with a boss positioned in the cavity, the boss is provided with a positioning groove, the cam comprises a rotating part matched with the rotating shaft of the cam and an extending part connected with the outer peripheral side of the rotating part, the rotating part is positioned in the positioning groove, the boss is provided with a first limiting surface positioned below the positioning groove, and one side of the extending part is matched with the first limiting surface so that the cam is hung on the boss.

In the trailer coupler, a first positioning part is arranged on the surface of the main body, one end of the cam rotating shaft penetrates through the cavity and the cam and then is connected with the knob, a second positioning part is arranged at the other end of the cam rotating shaft, and the second positioning part corresponds to the first positioning part so that the non-cylindrical section is opposite to the first non-circular hole.

In the trailer coupler, the boss is further provided with a guide groove positioned above the positioning groove, the guide groove is provided with an opening, and the unlocking ejector rod is inserted into the guide groove through the opening and vertically and slidably matched with the guide groove.

In the trailer coupler, the locking piece is rotatably installed in the installation cavity, a locking groove is formed in one side of the insertion block, and the locking piece is clamped into the locking groove to lock the insertion block in the installation cavity.

In the trailer coupler, a second limiting surface positioned below the locking piece is arranged in the mounting cavity, and when the locking piece is clamped into the locking groove, the locking piece is abutted against the second limiting surface.

In the trailer coupler, the mounting seat is further provided with a rotating shaft penetrating through the mounting cavity and an elastic reset piece located in the mounting cavity, the locking piece is rotationally sleeved on the rotating shaft, and the elastic reset piece is used for driving the locking piece to rotationally reset so as to be clamped into the locking groove.

In the trailer coupler, the plugging plate is fixedly connected with the main body through screws, and a sealing gasket is clamped between the plugging plate and the main body.

The utility model has the beneficial effects that:

when the unlocking device is assembled, the unlocking ejector rod vertically slides through the top wall of the cavity, so that part of the unlocking ejector rod is positioned in the cavity, then the transmission piece is filled into the cavity through the opening to be matched with the unlocking ejector rod, finally the driving piece is connected with the transmission piece, the plugging plate is arranged on the main body to plug the opening, and the design of the opening facilitates the assembly of the transmission piece and the matching of the transmission piece and the unlocking ejector rod, so that the assembly difficulty of the unlocking device is reduced, and the assembly efficiency of the trailer coupler is improved.

The driving piece comprises a knob and a cam rotating shaft, the driving piece is a cam, the cam rotating shaft penetrates through the cavity and the cam, and the knob is positioned on the outer side of the main body and connected with the cam rotating shaft to drive the cam rotating shaft and the cam to synchronously rotate. By means of the design, a user can drive the cam to rotate through rotating the knob, the cam jack can jack up the unlocking ejector rod upwards to further release locking of the locking piece, compared with an electric unlocking device, the manual unlocking device is simpler in structure, assembly of the trailer hook is facilitated, 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.

The cam is provided with a first non-circular hole, and the cam rotating shaft is provided with a non-cylindrical section matched with the first non-circular hole. By the design, the cam rotating shaft and the cam can synchronously rotate, the structure is simple, and the assembly of the cam and the cam rotating shaft is convenient, so that the assembly difficulty of the unlocking device is further reduced.

The medial surface of shutoff board is equipped with the boss that is located the cavity, and the boss is equipped with the constant head tank, and the cam includes the extension that rotates portion and is connected with the portion periphery side of rotating portion with cam pivot complex, and the rotating portion is located the constant head tank, and the boss is equipped with the first spacing face that is located the constant head tank below, and one side and the first spacing face cooperation of extension to make the cam hang to establish on the boss. The cam is hung on the boss, and then the cam rotating shaft penetrates through the main body and the cam, so that the first non-circular hole is not required to be manually kept, and the assembling difficulty of the unlocking device is further reduced; finally, the plugging plate is mounted on the main body.

The surface of main part is equipped with first location portion, and the one end of cam pivot runs through cavity and cam and then is connected with the knob, and the other end is equipped with second location portion, and second location portion corresponds with first location portion in order to make non-cylinder section and first non-round hole just right. So design, during the equipment, the one end that the cam pivot was equipped with second location portion is located the outside of main part, corresponds with the second location portion through first location portion, can guarantee that non-cylindrical section is just right with first non-round hole to smoothly run through first non-round hole when the cam pivot cartridge is in the main part, need not to make non-cylindrical section just right with first non-round hole through rotatory cam pivot, from this the equipment degree of difficulty of further having reduced cam pivot and cam, and then further reduced unlocking device's equipment degree of difficulty.

The boss is also provided with a guide groove positioned above the positioning groove, the guide groove is provided with an opening, and the unlocking ejector rod is inserted into the guide groove through the opening and vertically matched with the guide groove in a sliding way. By the design, the up-and-down movement of the unlocking ejector rod can be guided through the guide groove, so that the unlocking ejector rod is prevented from being blocked due to deflection when moving up and down.

The locking piece rotates to be installed in the installation cavity, and one side of inserted block is equipped with the locked groove, and the locking piece card goes into the locked groove in order to lock the inserted block in the installation cavity. So design, when needs maintenance locking piece or unlocking device, only need to dismantle alone mount pad or trailer hook can, compare among the prior art to locking piece and manual unlocking device dismantle the maintenance simultaneously, the maintenance of dismantling of trailer coupler is simpler convenient in this technical scheme.

The mounting cavity is internally provided with a second limiting surface positioned below the locking piece, and when the locking piece is clamped into the locking groove, the locking piece is propped against the second limiting surface. By the design, the locking piece can be prevented from rotating downwards when in a locking state through the second limiting surface, so that the situation that the locking piece is driven to rotate downwards under the action of self gravity or external force pulling to be separated from a locking groove is avoided, namely the situation that the locking piece falls off is avoided, and the locking reliability of the locking piece to the connecting part is improved; in addition, the design of the second limiting surface is simpler, 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.

The mounting seat is also provided with a rotating shaft penetrating through the mounting cavity and an elastic resetting piece located in the mounting cavity, the locking piece is rotationally sleeved on the rotating shaft, and the elastic resetting piece is used for driving the locking piece to rotationally 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 reset piece, other complex structures are not required to be additionally arranged to drive the locking piece to rotate and reset, namely, only one elastic reset piece is required to be added, the structure of the mounting seat and the trailer coupler is simplified, and the assembly efficiency of the trailer coupler is improved.

The plugging plate is fixedly connected with the main body through screws, and a sealing gasket is clamped between the plugging plate and the main body. By means of the design, detachable connection of the plugging plate can be achieved, so that the transmission piece can be conveniently detached or maintained in the later period, the dustproof and waterproof effect can be achieved through the sealing gasket, the phenomenon that the transmission piece cannot move due to foreign matters in the cavity is avoided, and therefore the disassembly and assembly of the trailer hook are affected.

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 trailer hook according to a first embodiment of the present utility model;

FIG. 3 is a schematic view of a part of the unlocking device according to the first embodiment of the present utility model;

FIG. 4 is a cross-sectional view of a portion of the structure of an unlocking device according to a first embodiment of the present utility model mounted on a main body;

FIG. 5 is a schematic structural view of a plugging plate according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a trailer hook according to a first embodiment of the present utility model;

FIG. 7 is an exploded view of a mounting base according to a first embodiment of the present utility model;

FIG. 8 is an exploded view of a portion of a mounting seat according to a first embodiment of the present utility model;

FIG. 9 is a cross-sectional view of a housing in accordance with an embodiment of the present utility model;

FIG. 10 is a cross-sectional view of a locking member locking a connecting portion in a mounting cavity according to a first embodiment of the present utility model;

FIG. 11 is a cross-sectional view of A-A of FIG. 10;

FIG. 12 is a cross-sectional view of B-B of FIG. 10;

fig. 13 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 third positioning portion; 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. an elastic reset piece; 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; 2211. a first positioning portion; 2210. a cavity; 222. a plugging plate; 2221. a boss; 2222. a positioning groove; 2223. a first limiting surface; 2224. a guide groove; 223. inserting blocks; 230. unlocking the ejector rod; 240. unlocking means; 241. a knob; 242. a transmission member; 2421. a rotating part; 2422. an extension; 243. a cam shaft; 2431. a non-cylindrical section; 2432. a limit boss; 24321. a second positioning portion; 2433. a cylindrical section; 244. a connecting shaft sleeve; 245. clamping springs; 246. a seal ring; 247. and a sealing gasket.

[ 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 arranged on the trailer coupler, wherein a mounting cavity which is opened downwards is arranged in the mounting seat, the trailer coupler comprises a connecting part, the connecting part comprises a main body provided with a cavity, a blocking plate and an inserting block arranged at the top of the main body, the inserting block is inserted into the mounting cavity and locked in the mounting cavity through a locking piece, the unlocking device comprises a driving piece, a transmission piece and an unlocking ejector rod, the unlocking ejector rod vertically slides to penetrate through the top wall of the cavity, the cavity is provided with an opening, the transmission piece is arranged in the cavity through the opening, the blocking plate is arranged on the main body to block the opening, and the driving piece drives the transmission piece to move so that the transmission piece drives the unlocking ejector rod to move upwards to unlock the locking piece, and the inserting block is detached from the mounting cavity.

When the unlocking device is assembled, the unlocking ejector rod vertically slides through the top wall of the cavity, so that part of the unlocking ejector rod is positioned in the cavity, then the transmission piece is filled into the cavity through the opening to be matched with the unlocking ejector rod, finally the driving piece is connected with the transmission piece, the plugging plate is arranged on the main body to plug the opening, and the design of the opening facilitates the assembly of the transmission piece and the matching of the transmission piece and the unlocking ejector rod, so that the assembly difficulty of the unlocking device is reduced, and the assembly efficiency of the trailer coupler is 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 13, the trailer coupling in this embodiment includes a mounting base 100, a trailer coupler 200, and an unlocking device 240 disposed on the trailer coupler 200, the mounting base 100 is fixedly connected to a connection plate 002 of an anti-collision beam 001 through a screw, the mounting base 100 includes a base 110, a mounting cavity 111 is disposed in the base 110, a lower end of the mounting cavity 111 is opened to form a socket, the trailer coupler 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 to a transverse section of the hook portion 210 or integrally formed with the connecting portion 220, the connecting portion 220 extends vertically upwards and is inserted into the mounting cavity 111 through the socket, the connecting portion 220 includes a main body 221 provided with a cavity 2210, a blocking plate 222, and an insert 223 disposed at a top of the main body 221, the insert 223 is inserted into the mounting cavity 111 and is locked into the mounting cavity 111 through a locking member 120, the unlocking device 240 includes a driving member, a driving member 242 and an unlocking jack 230, the unlocking jack 230 vertically slides through a top wall of the cavity 2210, the cavity 2210 has a mouth 242, the driving member 242 is mounted in the cavity 2210 through the mouth, the main body 220 is mounted on the plate and the blocking plate 222 is vertically extended and is inserted into the mounting cavity 111 through the mouth, the opening 221, and the driving member is released from the blocking member is mounted to the driving member 223, and the blocking member is unlocked and locked by the driving member is released from the driving member and locked by the blocking member 223.

When the unlocking device 240 in this embodiment is assembled, the unlocking ejector rod 230 is first slid vertically through the top wall of the cavity 2210, so that a part of the unlocking ejector rod 230 is located in the cavity 2210, then the transmission piece 242 is loaded into the cavity 2210 through an opening to be matched with the unlocking ejector rod 230, finally the driving piece is connected with the transmission piece 242, and the plugging plate 222 is installed on the main body 221 to plug the opening, so that the assembly of the transmission piece 242 and the matching of the transmission piece 242 and the unlocking ejector rod 230 are facilitated, the assembly difficulty of the unlocking device 240 is reduced, and the assembly efficiency of the trailer coupler is improved.

Specifically, as shown in fig. 2 to 6, 10 and 12, the insert 223 in this embodiment is integrally formed at the top of the main body 221, the cavity 2210 is provided with the opening on one side, the driving member 242 is a cam, the driving member includes a knob 241, a cam rotating shaft 243 and a connecting shaft sleeve 244, the cam is provided with a first non-circular hole, the connecting shaft sleeve 244 is provided with a second non-circular hole, the first non-circular hole and the second non-circular hole can be D-shaped holes, square holes and the like, and preferably, the first non-circular hole and the second non-circular hole are all D-shaped holes. The cam rotating shaft 243 comprises a non-cylindrical section 2431, a limiting boss 2432 arranged at one end of the non-cylindrical section 2431, and a cylindrical section 2433 arranged at the other end of the non-cylindrical section 2431, wherein the limiting boss 2432 is limited at the outer side of the cavity 2210, the non-cylindrical section 2431 penetrates through the cavity 2210, a first non-circular hole and a second non-circular hole, the cylindrical section 2433 penetrates through the knob 241 and is sleeved with a clamp spring 245, so that the connection between the cam rotating shaft 243 and the knob 241 is realized, the connecting shaft sleeve 244 is provided with the non-cylindrical section matched with the knob 241, and therefore the connecting shaft sleeve 244, the cam rotating shaft 243 and the cam can be driven to synchronously rotate through rotating the knob 241, after assembly is completed, the bottom end of the unlocking ejector 230 is propped against the cambered surface of the cam, when the knob 241 drives the cam to rotate upwards, the unlocking ejector 230 can be driven to move upwards to release the locking of the locking piece 120, and when the knob 241 drives the cam to rotate downwards, the unlocking ejector 230 moves downwards under the action of gravity to reset; in addition, the structure is simpler, and the assembly of the cam and the cam rotating shaft 243 is more convenient, so that the assembly difficulty of the unlocking device 240 is further reduced; finally, compared with an electric unlocking device, the manual unlocking can not only enable the structure of the unlocking device 240 to be simpler, but also facilitate the assembly of the trailer hook 200, improve the assembly efficiency of the trailer hook 200, and reduce the problem that the trailer hook 200 cannot be disassembled and assembled due to electric faults.

In addition, as shown in fig. 3, 5 and 10, in order to further reduce the assembly difficulty of the unlocking device 240, in this embodiment, a boss 2221 located in the cavity 2210 is provided on the inner side surface of the plugging plate 222, the boss 2221 is provided with a positioning groove 2222, the cam includes a rotating portion 2421 engaged with the cam rotating shaft 243 and an extending portion 2422 connected to a part of the outer peripheral side of the rotating portion 2421, the rotating portion 2421 is defined in the positioning groove 2222, the boss 2221 is provided with a first limiting surface 2223 located below the positioning groove 2222, and one side of the extending portion 2422 is engaged with the first limiting surface 2223, so that the cam is hung on the boss 2221. In this design, the first limiting surface 2223 can limit the posture of the cam hung on the boss 2221 to ensure the posture of the first non-circular hole, when in assembly, the cam is firstly hung on the boss 2221 to perform the preset positioning, and then the cam rotating shaft 243 penetrates through the main body 221 and the cam, so that the cam is not required to manually maintain the posture of the first non-circular hole when in assembly, and the assembly difficulty of the unlocking device 240 is further reduced; finally, the plugging plate 222 is mounted on the main body 221 through screws, so that the plugging plate 222 can be detachably connected, and the transmission piece 242 can be conveniently detached or maintained at a later stage.

Preferably, the boss 2221 is further provided with a guide groove 2224 located above the positioning groove 2222, the guide groove 2224 has an opening, and the unlocking post 230 is inserted into the guide groove 2224 through the opening and vertically slidably cooperates with the guide groove 2224. By such design, the guide groove 2224 can guide the up-and-down movement of the unlocking post 230, so as to avoid the jamming caused by the deflection of the unlocking post 230 during the up-and-down movement.

As shown in fig. 6, in order to further facilitate the assembly of the cam shaft 243, in this embodiment, the surface of the main body 221 is provided with a first positioning portion 2211, the first positioning portion 2211 is a positioning counter bore or a positioning protruding point, the outer peripheral side of the limiting boss 2432 is provided with a second positioning portion 24321, when the cam shaft 243 is inserted onto the main body 221, the second positioning portion 24321 corresponds to the first positioning portion 2211, so that the transmission plane of the non-cylindrical section 2431 is opposite to the transmission plane of the first non-circular hole, and the non-cylindrical section 2431 smoothly penetrates the first non-circular hole, so that the transmission plane of the non-cylindrical section 2431 is not opposite to the transmission plane of the first non-circular hole by rotating the cam shaft 243, thereby further reducing the assembly difficulty of the cam shaft 243 and the cam, and further reducing the assembly difficulty of the unlocking device 240.

Secondly, in order to prevent dust and water from entering cavity 2210, still overlap in the outside of spacing boss 2432 and connecting axle sleeve 244 and be equipped with sealing washer 246, the axial cross-section of sealing washer 246 is the V type structure of opening towards outside to promote sealed reliability, and press from both sides between shutoff board 222 and main part 221 and be equipped with sealing washer 247, so design, can realize dustproof waterproof's effect through sealing washer 247, avoid having the foreign matter to lead to the transmission piece 242 unable motion in cavity 2210, and then influence the dismouting of trailer hook 200.

It should be noted that, in this embodiment, the insert 223 and the top of the main body 221 form an avoidance space for avoiding the unlocking ejector rod 230, one side of the insert 223 facing the avoidance space is partially recessed to form a locking groove 2201, the locking groove 2201 is an arc groove, and the unlocking ejector rod 230 can enter the avoidance space when moving upwards, so as to push the locking member 120 to rotate upwards and unlock the connecting portion 220.

As shown in fig. 7 to 9, in this embodiment, the mounting seat 100 is further provided with a rotating shaft 130 penetrating through the mounting cavity 111, the locking member 120 is a fan-shaped plate, the locking member 120 is sleeved on the rotating shaft 130 and can rotate, two opposite sides of the seat body 110 are respectively provided with a first through hole 112 and a second through hole 113 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 hole 113, so that the rotating shaft 130 is axially limited on the seat body 110 through the holding end 131 and the circlip. 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 this embodiment, the locking member 120 is rotatably installed in the installation cavity 111, and the unlocking device 240 is installed at the connection portion 220 of the trailer coupler 200, so that when the locking member 120 or the unlocking device 240 needs to be maintained, only the installation seat 100 or the trailer coupler 200 needs to be detached separately, and the disassembly and maintenance of the trailer coupler are simpler and more convenient; finally, the unlocking device 240 is arranged on the trailer hook 200, and the unlocking device 240 can be further away from the chassis, so that a user can conveniently operate the unlocking device 240, and the use experience of the user is improved.

In addition, an elastic reset piece 140 is further disposed in the mounting cavity 111 of the embodiment, the elastic reset piece 140 is a torsion spring, the torsion spring has two torsion legs 141, a fan-shaped surface of the locking piece 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 countersink, 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 the insertion end 132, an annular boss between the outer diameters of the shaft body and the holding end 131 is disposed, the annular 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 is sleeved on the shaft body, one torsion leg 141 and the insertion tapered countersink are inserted into the slot, and the other torsion leg is inserted into the slot, so that the locking piece 120 can be driven to rotate and reset by a restoring force of the torsion spring to be blocked into the locking slot 2201, and only one torsion spring is required to be additionally disposed to drive the locking piece 120 to rotate and reset, thereby, and the efficiency of the coupler of the mounting seat 100 is simplified, and the coupler is improved; in addition, by the design, the first inserting portion 122 and the second inserting portion 133 are convenient for assembling the torsion spring, 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 third positioning portion 115 and a limiting groove 116 are arranged on the outer side of the seat body 110 and located outside the first through hole 112 at intervals, the third positioning portion 115 is a positioning blind hole or a positioning protruding point, preferably a positioning blind hole, a positioning protruding lug 134 is arranged on the outer periphery of the limiting plate in a protruding mode, a mounting opening 114 communicated with the mounting cavity 111 is formed in the top of the seat body 110, a second limiting surface 1111 is arranged on the inner wall of the mounting cavity 111, and the second limiting surface 1111 is located right below the mounting opening 114 and extends obliquely downwards towards 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 second limiting surface 1111, the locking piece 120 is pre-positioned through the second limiting surface 1111, the first inserting part 122 and the third positioning part 115 are positioned on the same straight line, then a nylon gasket, a sealing piece and a torsion spring are sequentially sleeved on the rotating shaft 130, one torsion foot 141 of the torsion spring 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 into the seat body 110 through the first through hole 112, the locking piece 120 and the second through hole 113, when the assembly is inserted, the positioning lug 134 on the rotating shaft 130 is aligned with the third positioning part 115, so that the other torsion foot 141 of the torsion spring can be smoothly inserted into the conical countersunk hole along the guide conical surface of the conical countersunk hole when the rotating shaft 130 penetrates through the seat body 110, at the moment, and the other torsion spring 141 is rotated by an angle, the positioning lug 134 is enabled to be embedded into the second through the positioning lug 134, and the opposite to the lower limit groove 120 is prevented from being dismounted, and the vibration of the rotating body 120 is prevented from being mounted on the rotating body 110, and the opposite to the side wall of the locking piece 120 is prevented from being mounted on the side of the rotating body 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.

When the trailer coupling in this embodiment is used, if the trailer coupling 200 needs to be assembled for hooking, the unlocking ejector 230 is first ensured to be in a state of being moved down and reset, then the connecting part 220 is inserted into the installation cavity 111 through the insertion opening, during the process of being inserted into the installation cavity 111, the insertion block 223 will 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 rotates down and 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 abutted against the second limiting surface 1111 (as shown in fig. 10), so that the second limiting surface 1111 can prevent the locking part 120 from rotating downwards when the trailer coupling 200 is in a locked state, so as to avoid the condition that the locking part 120 is driven to rotate downwards under the action of self gravity or the external force pulling action, namely, the falling of the trailer coupling 200 is avoided, thereby improving the locking reliability of the locking part 120 to the connecting part 220. If the trailer hook 200 needs to be disassembled for storage, the rotation knob 241 rotates the cam shaft 243 to drive the cam to rotate upwards, so that the cam 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. 13), and at this time, the connecting portion 220 can be disassembled from the mounting cavity 111, so that the trailer hook 200 is disassembled.

It is understood that in other embodiments of the present utility model, the elastic restoring member may also be a tension spring disposed between the locking member and the second limiting surface, where the tension spring is used to drive the locking member to rotate and restore to be locked in the locking slot.

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. 6 to 9, 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 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 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. 8, 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. 7 and 11, 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 limits the axial direction of 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 facing 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 first conical arc surface 121 and the second conical arc surface 22010 can be smoothly made. 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 unlocking ejector rod is provided with a rack part, the transmission part is a gear meshed with the tooth part and arranged in the cavity, the driving part is a knob or a motor, the gear is connected with the driving part, the unlocking ejector rod is driven to move up and down through the rotation of the rotary knob or the motor driving gear, when the trailer hook is required to be disassembled, the unlocking ejector rod is driven to move up through the rotation of the motor driving gear, the locking part is pushed to rotate up to be separated from the locking groove, the locking of the locking part to the connecting part is released, after the disassembly is completed, the unlocking ejector rod can be moved down to reset through the reverse rotation of the reverse rotation operation part or the reverse rotation of the driving motor, and the unlocking ejector rod is prevented from being interfered to rotate down to enable the locking part to be incapable of being clamped into the locking groove when the trailer hook and the mounting seat are assembled again.

Example III

Compared with the first embodiment, the present embodiment is different in that: the locking piece rotates and installs on the inserted block, is located locking piece axis of rotation below on the inserted block and is equipped with dodges the hole this moment, and the locked groove is located on the inner wall of installation cavity, when connecting portion cartridge in the installation cavity, the locking piece can rotate down around the pivot and get into dodge the hole, and when connecting portion assembly in place, the locking piece upwards rotates under the torsion effect of torsional spring and resets and block into the locked groove to lock connecting portion at the installation intracavity. If need dismantle the trailer hook and accomodate the time, rotatory knob makes cam shaft drive cam upwards rotate to make cam drive unblock ejector pin upwards move, the unblock ejector pin gets into the installation cavity and promotes the locking piece upwards to rotate and break away from the locked groove, in order to release the locking of locking piece to connecting portion, the pulling down at this moment can realize dismantling.

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 coupler comprises a mounting seat, a trailer coupler and an unlocking device arranged on the trailer coupler, wherein a mounting cavity which is opened downwards is arranged in the mounting seat, the trailer coupler comprises a connecting part, and the trailer coupler is characterized in that the connecting part comprises a main body provided with a cavity, a plugging plate and a plugging block arranged at the top of the main body, the plugging block is inserted into the mounting cavity and locked in the mounting cavity through a locking piece, the unlocking device comprises a driving piece, a transmission piece and an unlocking ejector rod, the unlocking ejector rod vertically slides to penetrate through the top wall of the cavity, the cavity is provided with an opening, the transmission piece is arranged in the cavity through the opening, the plugging plate is arranged on the main body to plug the opening, and the driving piece drives the transmission piece to move so that the transmission piece drives the unlocking ejector rod to move upwards to unlock the locking of the locking piece, and the plugging block is detached from the mounting cavity.

2. The trailer coupling of claim 1, wherein the drive member comprises a knob and a cam shaft, the drive member being a cam, the cam shaft extending through the cavity and the cam, the knob being located outside the body and connected to the cam shaft for synchronizing rotation of the cam shaft and the cam.

3. The trailer coupling of claim 2 wherein the cam is provided with a first non-circular aperture and the cam shaft has a non-cylindrical section that mates with the first non-circular aperture.

4. A trailer coupling as claimed in claim 3 wherein the inner side of the closure plate is provided with a boss located in the cavity, the boss being provided with a detent, the cam including a rotating portion which engages with the cam shaft and an extension portion which is connected to the outer peripheral side of the rotating portion, the rotating portion being located in the detent, the boss being provided with a first stop face located below the detent, one side of the extension portion engaging with the first stop face to allow the cam to hang on the boss.

5. The trailer coupling of claim 4, wherein a first locating portion is provided on a surface of the body, one end of the cam shaft extends through the cavity and the cam and is connected to the knob, and a second locating portion is provided on the other end of the cam shaft, the second locating portion corresponding to the first locating portion such that the non-cylindrical section is opposite to the first non-circular hole.

6. The trailer coupling of claim 4, wherein the boss is further provided with a guide slot above the detent, the guide slot having an opening through which the unlocking post is inserted into the guide slot and is in vertical sliding engagement with the guide slot.

7. The trailer coupling of claim 1 wherein the locking member is rotatably mounted within the mounting cavity, a lock slot being provided on one side of the insert, the locking member being snapped into the lock slot to lock the insert within the mounting cavity.

8. The trailer coupling of claim 7, wherein a second stop surface is disposed in the mounting cavity below the locking member, the locking member abutting the second stop surface when the locking member is snapped into the locking groove.

9. The trailer coupling of claim 7, wherein the mounting base is further provided with a rotating shaft penetrating through the mounting cavity and an elastic reset member located in the mounting cavity, the locking member is rotatably sleeved on the rotating shaft, and the elastic reset member is used for driving the locking member to rotate and reset to be clamped into the locking groove.

10. The trailer coupling of any one of claims 1-9, wherein the plugging plate is secured to the body by a screw connection, and a gasket is sandwiched between the plugging plate and the body.