CN219706579U - Trailer coupling - Google Patents

Abstract

The utility model discloses a trailer coupler, which comprises a mounting seat, a trailer coupler, a locking piece and an unlocking device, wherein a mounting cavity which is opened downwards is arranged in the mounting seat, the trailer coupler comprises a connecting part, the locking piece is provided with a locking state for locking the connecting part in the mounting cavity and an unlocking state for unlocking the connecting part, the unlocking device is used for driving the locking piece to act so as to enable the locking piece to be switched from the locking state to the unlocking state, a blocking surface is arranged on the inner wall of the mounting cavity, an anti-falling surface is arranged on the connecting part, and when the locking piece is in the unlocking state, the anti-falling surface can be hung on the blocking surface so as to prevent the trailer coupler from falling. According to the trailer coupler, when the locking piece is in the unlocking state, the trailer coupler is prevented from suddenly falling, so that the safety of a user is protected, and the use experience of the user is improved.

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 the mount pad, the trailer coupler mount pad, locking piece and unlocking device, be equipped with the installation cavity that opens downwards in the mount pad, the bottom of installation cavity is equipped with the socket, the trailer coupler includes the connecting portion, the connecting portion inserts in the installation cavity through the socket, the locking piece has the locking state of locking connecting portion in the installation cavity and the unblock state of releasing the locking to the connecting portion, unlocking device is used for driving the action of locking piece so that it is switched to the unblock state from the locking state, like this alright when not needing to use the trailer coupler, dismantle the trailer coupler from the mount pad and accomodate, thereby avoided above-mentioned problem. However, when the trailer hook is detached, the locking piece is in an unlocking state, so that when a user does not pull the trailer hook, the trailer hook can fall to injure the user by crushing, and the use experience of the user is reduced.

[ utility model ]

The technical problem to be solved by the utility model is to overcome the defects of the prior art, provide the trailer coupler, and prevent the trailer coupler from suddenly falling when the locking piece is in an unlocking state, so as to protect the safety of a user and further improve the use experience of the user.

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 body, a locking piece and an unlocking device, wherein a mounting cavity which is opened downwards is arranged in the mounting seat, the trailer coupler body comprises a connecting portion, the locking piece is provided with a locking state for locking the connecting portion in the mounting cavity and an unlocking state for unlocking the connecting portion, the unlocking device is used for driving the locking piece to act so as to enable the locking piece to be switched to the unlocking state from the locking state, a blocking surface is arranged on the inner wall of the mounting cavity, an anti-falling surface is arranged on the connecting portion, and when the locking piece is in the unlocking state, the anti-falling surface can be hung on the blocking surface so as to prevent the trailer coupler body from falling.

In the trailer coupler, one side of the connecting part is provided with a vertically extending anti-falling groove, the upper end of the anti-falling groove is closed, the top wall of the anti-falling groove forms the anti-falling surface, the inner wall of the mounting cavity is provided with a blocking piece inserted into the anti-falling groove, and the top surface of the blocking piece forms the blocking surface.

In the trailer coupler, the lower end of the anti-falling groove is closed, and the lower end of the anti-falling groove is positioned in the mounting cavity.

In the trailer coupler, the inner wall of the mounting cavity is provided with a blocking groove extending vertically, the lower end of the blocking groove is closed, the bottom wall of the blocking groove forms the blocking surface, one side of the connecting part is convexly provided with an anti-falling lug inserted into the blocking groove, and the bottom surface of the anti-falling lug forms the anti-falling surface.

In the trailer coupler, the falling preventing surface is an inclined surface extending downwards in an inclined mode, and the blocking block extends upwards in an inclined mode towards the inside of the mounting cavity to be matched with the inclined surface.

In the trailer coupling, a guiding inclined plane which is inclined from bottom to top to the blocking surface direction is further arranged in the mounting cavity, and the guiding inclined plane is used for guiding the connecting part to move towards the blocking surface direction when being inserted so that the falling preventing surface is positioned above the blocking surface.

In the trailer coupling, one side of the connecting part, which faces away from the blocking surface, is locked in the mounting cavity through the locking piece, and the guide inclined surfaces are arranged on two sides of the locking piece.

In the trailer coupler, the connecting part comprises a main body and an inserting block arranged at the top of the main body, the inserting block and the top of the main body form an avoidance step, the anti-falling surface is arranged on one side of the inserting block opposite to the avoidance step, when the locking part is in a locking state, a first gap between the anti-falling surface and the blocking surface is larger than the depth of the avoidance step extending into the mounting cavity, a second gap exists between the vertical surface of the avoidance step and the inner wall of the mounting cavity, and when the locking part is in an unlocking state, the anti-falling surface moves downwards to eliminate the first gap and then moves towards the direction away from the blocking surface to eliminate the second gap so as to avoid the blocking surface, so that the connecting part is detached from the mounting cavity.

In the trailer coupler, the locking piece is rotatably installed in the installation cavity, a locking groove is formed in one side, opposite to the blocking surface, of the connecting portion, when the locking piece is in a locking state, the locking piece is clamped into the locking groove, and when the locking piece is in an unlocking state, the locking piece is separated from the locking groove.

In the trailer coupler, the unlocking device comprises an unlocking ejector rod and a manual operation assembly, wherein the unlocking ejector rod is vertically and slidably installed on the connecting portion, and the manual operation assembly drives the unlocking ejector rod to move upwards into the installation cavity so as to enable the locking piece to be switched to an unlocking state.

The utility model has the beneficial effects that:

when the trailer hook is disassembled, the locking piece is in an unlocking state, the trailer hook moves downwards under the action of gravity, and the connecting part is hung on the blocking surface through the falling preventing surface, so that the trailer hook can be prevented from suddenly falling, the safety of a user is protected, and the use experience of the user is improved.

One side of the connecting part is provided with a vertically extending anti-falling groove, the upper end of the anti-falling groove is closed, the top wall of the anti-falling groove forms an anti-falling surface, the inner wall of the mounting cavity is provided with a blocking piece inserted into the anti-falling groove, and the top surface of the blocking piece forms a blocking surface. By means of the design, the weight of the trailer coupler can be reduced through the anti-falling groove, so that the trailer coupler is more labor-saving to disassemble and assemble, the whole structure is simpler, the processing and forming are easy, and the manufacturing cost of the trailer coupler is reduced.

The lower extreme in anti-falling groove is sealed, and the lower extreme in anti-falling groove is located the installation intracavity. By the design, the anti-falling groove can be hidden in the mounting cavity, so that the appearance of the trailer coupler is improved, dust, foreign matters and the like can be prevented from entering the anti-falling groove and the mounting cavity, and the trailer coupler cannot be pulled out downwards to be detached.

The anti-falling surface is an inclined surface extending downwards in an inclined way, and the blocking block extends upwards in an inclined way towards the inside of the installation cavity so as to be matched with the inclined surface. By the design, the anti-falling surface is hooked on the blocking surface, so that the stability of the anti-falling surface on the blocking surface is improved, and the trailer hook is further prevented from falling.

The installation cavity is also internally provided with a guide inclined plane which is inclined from bottom to top towards the blocking surface direction, and the guide inclined plane is used for guiding the connecting part to move towards the blocking surface direction when being inserted, so that the falling prevention surface is positioned above the blocking surface. By the design, the anti-falling surface can be smoothly positioned above the blocking surface through the guide inclined surface when the connecting part is inserted into the mounting cavity, namely, the anti-falling surface can be ensured to be positioned above the blocking surface after the connecting part is inserted in place, and the position of the connecting part does not need to be independently adjusted, so that the assembly difficulty of the trailer hook is reduced.

The side of the connecting part, which is opposite to the blocking surface, is locked in the mounting cavity through the locking piece, and the guide inclined surfaces are arranged on two sides of the locking piece. By the design, the guiding stability of the guiding inclined plane to the connecting part can be improved, and the clamping stagnation caused by the inclination of the connecting part during the insertion is avoided; but also can move towards the blocking surface through the connecting part, so that the locking piece can smoothly act to lock the connecting part in the mounting cavity.

The connecting portion comprises a main body and an inserting block arranged at the top of the main body, the inserting block and the top of the main body form an avoidance step, the anti-falling surface is arranged on one side of the inserting block opposite to the avoidance step, when the locking piece is in a locking state, a first gap between the anti-falling surface and the blocking surface is larger than the depth of the transverse surface of the avoidance step extending into the mounting cavity, a second gap exists between the vertical surface of the avoidance step and the inner wall of the mounting cavity, and when the locking piece is in an unlocking state, the anti-falling surface moves downwards to eliminate the first gap and then moves towards the direction away from the blocking surface to eliminate the second gap so as to avoid the blocking surface, so that the connecting portion is detached from the mounting cavity. So design, after preventing that the face is hung and is established on blocking the face, follow-up when removing connecting portion from the installation cavity, need lift the tow hook earlier and make preventing that the face is located blocking the face top, remove the tow hook towards the one side that keeps away from blocking the face afterwards and eliminate the second clearance, make the vertical projection of preventing the face lie in the face outside of blocking completely, draw the tow hook downwards at last, can make connecting portion remove from the installation cavity.

The locking piece rotates and installs in the installation cavity, and the connecting portion is equipped with the locked groove in the side of blocking the face dorsad, and when the locking piece was in the locking state, the locking piece card was gone into in the locked groove, and when the locking piece was in the unblock state, the locking piece was broken away from the locked groove. The design is simple in structure, easy to machine and shape, and reduces the manufacturing cost of the trailer coupler.

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; 1112. a blocking surface; 1113. a guide slope; 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; 224. an anti-falling groove; 2241. an anti-falling surface; 230. unlocking the ejector rod; 240. a manual operation assembly; 241. a knob; 242. a cam; 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, a locking piece and an unlocking device, wherein a mounting cavity which is opened downwards is arranged in the mounting seat, the trailer coupler comprises a connecting part, the locking piece is provided with a locking state for locking the connecting part in the mounting cavity and an unlocking state for unlocking the connecting part, and the unlocking device is used for driving the locking piece to act so as to enable the locking piece to be switched from the locking state to the unlocking state.

When the trailer hook is disassembled, the locking piece is in an unlocking state, the trailer hook moves downwards under the action of gravity, and the connecting part is hung on the blocking surface through the falling preventing surface, so that the trailer hook can be prevented from suddenly falling, the safety of a user is protected, and the use experience of the user 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, a locking member 120 and an unlocking device, the mounting base 100 is fixedly connected to a connection plate 002 of a bumper beam 001 by a screw, the mounting base 100 includes a base 110, a mounting cavity 111 is provided 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, the connecting portion 220 extends vertically upward and is inserted into the mounting cavity 111 through the socket, the locking member 120 has a locking state for locking the connecting portion 220 in the mounting cavity 111 and an unlocking state for unlocking the connecting portion 220, the unlocking device is used for driving the locking member 120 to switch from the locking state to the unlocking state, a blocking surface 1112 is provided on an inner wall of the mounting cavity 111, the connecting portion 220 is provided with a falling preventing surface 2241, and the falling preventing surface 2241 can be hung on the blocking surface 1112 to prevent the trailer coupler 200 when the locking member 120 is in the unlocking state.

When the trailer hook 200 is detached, the locking piece 120 is in an unlocking state, at this time, the trailer hook 200 moves downwards under the action of gravity, and the connecting portion 220 is hung on the blocking surface 1112 through the falling preventing surface 2241, so that the trailer hook 200 can be prevented from suddenly falling, thereby protecting the safety of a user and improving the use experience of the user.

Specifically, as shown in fig. 2 to 6, 10 and 12, the connecting portion 220 in this embodiment includes a main body 221 provided with a cavity 2210, a blocking plate 222, and an insert 223 disposed at the top of the main body 221, where the insert 223 is integrally formed at the top of the main body 221, one side of the cavity 2210 is provided with an opening, the unlocking device includes an unlocking ejector 230 and a manual operation assembly 240, the unlocking ejector 230 vertically slides through the top wall of the cavity 2210, the manual operation assembly 240 includes a knob 241, a cam 242, a cam rotating shaft 243 and a connecting shaft sleeve 244, the cam 242 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 first non-circular hole and the second non-circular hole are preferably 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 on 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 cam rotating shaft 243 is connected with the knob 241, 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 242 can be driven to synchronously rotate through the rotating knob 241, after assembly is completed, the bottom end of the unlocking ejector rod 230 is abutted against the cambered surface of the cam 242, when the knob 241 drives the cam 242 to upwards rotate, the unlocking ejector rod 230 can be driven to upwards move under the action of gravity when the knob 241 drives the cam 242 to downwards rotate. In addition, the structure is simpler, and the assembly of the cam 242 and the cam rotating shaft 243 is more convenient, so that the assembly difficulty of the unlocking device is further reduced; finally, 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 200 is facilitated, the assembly efficiency of the trailer hook 200 is improved, and the problem that the trailer hook 200 cannot be disassembled and assembled due to electric faults can be solved.

In addition, as shown in fig. 3, 5 and 10, in order to further reduce the assembly difficulty of the unlocking device, 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 242 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 242 is hung on the boss 2221. By adopting the design, the gesture of the cam 242 hung on the boss 2221 can be limited through the first limiting surface 2223 so as to ensure the gesture of the first non-circular hole, when the unlocking device is assembled, the cam 242 is firstly hung on the boss 2221 to perform preset positioning, and then the cam rotating shaft 243 penetrates through the main body 221 and the cam 242, so that the gesture of the first non-circular hole is not required to be manually kept when the cam 242 is assembled, and the assembling difficulty of the unlocking device 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 cam 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.

Secondly, in order to prevent dust and water from entering the cavity 2210, a sealing ring 246 is further sleeved on the outer sides of the limiting boss 2432 and the connecting shaft sleeve 244, the axial section of the sealing ring 246 is of a V-shaped structure with an opening facing the outer side, so that sealing reliability is improved, a sealing gasket 247 is clamped between the plugging plate 222 and the main body 221, the dustproof and waterproof effects can be achieved through the sealing gasket 247, and the phenomenon that the cam 242 cannot move due to foreign matters in the cavity 2210 is avoided, so that the disassembly and assembly of the trailer hook 200 are affected.

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, the insert 223 is partially recessed toward one side of the avoidance space (i.e., the side opposite to the blocking surface 1112) to form a locking groove 2201, the locking groove 2201 is an arc-shaped groove, in this embodiment, a part of the connecting portion 220 is inserted into the mounting cavity 111, i.e., the insert 223 is inserted into the mounting cavity 111, the locking of the insert 223 is achieved by the locking member 120 being blocked into the locking groove 2201, 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 release the locking of 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 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, and the disassembly and maintenance of the trailer coupler are simpler and more convenient; 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.

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, in 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 downwards under the torsion force of the torsion spring to reset and is clamped into the locking groove 2201, so as to lock the connecting part 220 in the installation cavity 111, and at the moment, the locking part 120 abuts against the second limiting surface 1111 and is in a locking state (as shown in fig. 10), so that the locking part 120 can be prevented from rotating downwards when being in the locking state by the second limiting surface 1111, and the condition that the locking part 120 is driven to rotate downwards under the action of self gravity or external force pulling to enable the locking part 120 to be separated from the locking groove 2201 is avoided, namely, the falling of the trailer coupling 200 is avoided, and the locking reliability of the locking part 120 to the connecting part 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 member 120 to rotate upwards and separate from the locking groove 2201, so as to unlock the connecting portion 220 by the locking member 120, and the locking member 120 is in an unlocked state (as shown in fig. 13).

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.

As shown in fig. 9 and 13, in order to avoid injury to a user caused by sudden falling of the trailer hook 200 when the locking member 120 is in the unlocked state, in this embodiment, a vertically extending anti-falling slot 224 is provided on a side of the insert 223 facing away from the locking slot 2201, the upper end of the anti-falling slot 224 is closed, the top wall of the anti-falling slot 224 forms the anti-falling surface 2241, a blocking block is provided on the inner wall of the installation cavity 111 in a protruding manner, the top surface of the blocking block forms the blocking surface 1112, and when the connecting portion 220 is locked in the installation cavity 111, the blocking block is inserted into the anti-falling slot 224, the blocking surface 1112 is located below the anti-falling surface 2241, so that the trailer hook 200 can be prevented from falling on the blocking surface 1112 through the anti-falling surface 2241 when the locking member 120 is in the unlocked state, the overall structure is simple, the processing and shaping are easy, and the manufacturing cost of the trailer coupler is reduced; in addition, the design of the anti-falling groove can also lighten the weight of the trailer hook 200, so that the disassembly and assembly of the trailer hook 200 are more labor-saving.

Preferably, the anti-falling surface 2241 is an inclined surface extending obliquely downwards, the blocking surface 1112 extends obliquely upwards towards the inside of the installation cavity 111, and when the anti-falling surface 2241 is hung on the blocking surface 1112, the blocking surface 1112 is matched with the inclined surface, so that the anti-falling surface 2241 can be hooked on the blocking surface 1112, the stability of the anti-falling surface 2241 hung on the blocking surface 1112 is improved, and the trailer hook 200 is further prevented from falling.

Preferably, the lower end of the anti-falling groove is closed, and the lower end of the anti-falling groove is positioned in the mounting cavity 111. By the design, the anti-falling groove can be hidden in the mounting cavity 111 to increase the appearance of the trailer coupler, and dust, foreign matters and the like can be prevented from entering the anti-falling groove and the mounting cavity 111, so that the trailer coupler 200 cannot be pulled out downwards to be detached.

In addition, as shown in fig. 13, in this embodiment, the insert 223 forms an avoidance step with the top of the main body 221, the vertical surface of the avoidance step is provided with the locking groove 2201, the unlocking ejector 230 penetrates through the transverse surface of the avoidance step, the size of the insert 223 is smaller than that of the socket, the size of the main body 221 is matched with that of the socket, so that when the locking piece 120 is in a locking state, the main body 221 can block the socket, when the locking piece 120 is in a locking state, the anti-falling surface 2241 is located above the blocking surface 1112, a first gap between the anti-falling surface 2241 and the blocking surface 1112 is H1, the depth of the avoidance step transverse surface extending into the installation cavity 111 is H2, the requirement that H1 is larger than H2, a second gap W1 exists between the avoidance step vertical surface and the inner wall of the installation cavity 111, the anti-falling surface 2241 is arranged on the blocking surface 1112, the matching width of the anti-falling surface 2241 is W2, when the anti-falling surface 2241 is arranged on the blocking surface 1112, the coupling 220 is subsequently pulled out from the installation cavity 111, the anti-falling surface 2241 is required to be lifted up, the anti-falling surface 200 is located above the blocking surface 1112, and the side of the installation cavity 1112 is completely, the anti-falling surface is completely pulled down device 200, and the vertical surface is located at the side of the installation cavity 111, and the side of the anti-falling surface is completely opposite to the installation cavity 200, and the protection cavity is kept away from the side of the installation cavity 200, and the vertical plane is kept away from the side 200.

In addition, in this embodiment, a guiding inclined surface 1113 inclined from bottom to top toward the blocking surface 1112 is further disposed in the mounting cavity 111, the guiding inclined surface 1113 is located at the left and right sides of the locking member 120 when in a locked state, when the connecting portion 220 abuts against the bottom of the guiding inclined surface 1113, the blocking block is located at the outer side of the anti-falling groove, that is, not inserted into the anti-falling groove, when the connecting portion 220 abuts against the top of the guiding inclined surface 1113, the blocking block is inserted into the anti-falling groove, and the anti-falling surface 2241 is located above the blocking surface 1112. By the design, when the connecting part 220 is inserted into the mounting cavity 111, the connecting part 220 is guided to transversely move towards the blocking surface 1112 through the guide inclined surface 1113, so that the blocking block is inserted into the anti-falling groove 224, and the anti-falling surface 2241 is smoothly moved to the upper part of the blocking surface 1112, namely, after the connecting part 220 is inserted in place, the anti-falling surface 2241 can be ensured to be positioned above the blocking surface 1112, the position of the connecting part 220 is not required to be independently adjusted, thus the assembly difficulty of the trailer 200 is reduced, and when the trailer 200 is disassembled, the trailer 200 is pushed upwards to enable the insert 223 to abut against the guide inclined surface 1113, the anti-falling surface 2241 is ensured to be positioned above the blocking surface 1112, and then the trailer 200 is pulled downwards, and at the moment, the insert 223 moves downwards leftwards along the guide inclined surface 1113, so that the trailer 200 can be disassembled from the mounting seat 100, and the disassembly is more convenient; in addition, the guiding inclined planes 1113 are arranged at two sides of the locking piece 120, so that the guiding stability of the guiding inclined planes 1113 to the connecting part 220 can be improved, and the connecting part 220 is prevented from being inclined to generate clamping stagnation when being inserted; finally, since the locking groove 2201 is disposed on the side of the connecting portion 220 opposite to the blocking surface 1112, the connecting portion 220 can move toward the blocking surface 1112 to avoid the locking groove 2201, so that the locking member 120 can smoothly rotate and clamp into the locking groove 2201 to lock the connecting portion 220 in the mounting cavity 111.

It will be appreciated that in other embodiments of the present utility model, the inner wall of the installation cavity is further provided with a vertically extending blocking groove, the lower end of the blocking groove is closed, the bottom wall of the blocking groove forms a blocking surface, one side of the connecting portion, which is away from the locking groove, is convexly provided with an anti-falling bump, the bottom surface of the anti-falling bump forms an anti-falling surface, and after the connecting portion is inserted in place, the anti-falling bump is inserted into the blocking groove, so that the towing hook is hung on the blocking surface through the anti-falling surface to prevent the towing hook from falling.

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 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 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.

It will be appreciated that in other embodiments of the utility model, the gear may also be coupled to a motor, such that electric unlocking may be achieved.

Example III

Compared with the first and second 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 IV

Compared with the first to third embodiments, the present embodiment is different in that: the locking piece rotates and installs in the inserted block one side that deviates from the face that blocks, is located locking piece axis of rotation below on the inserted block this moment and is equipped with dodges the hole, 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, 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 the trailer hook is required to be disassembled for storage, the unlocking ejector rod is driven to move upwards, the unlocking ejector rod enters the mounting cavity and pushes the locking piece to rotate upwards and separate from the locking groove, so that the locking of the locking piece to the connecting part is released.

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 body, a locking piece and an unlocking device, wherein a mounting cavity which is opened downwards is arranged in the mounting seat, the trailer coupler body comprises a connecting part, the locking piece is provided with a locking state for locking the connecting part in the mounting cavity and an unlocking state for unlocking the connecting part, and the unlocking device is used for driving the locking piece to act so as to enable the locking piece to be switched from the locking state to the unlocking state.

2. The trailer coupling of claim 1, wherein one side of the connection portion is provided with a vertically extending fall prevention groove, an upper end of the fall prevention groove is closed, a top wall of the fall prevention groove forms the fall prevention surface, an inner wall of the installation cavity is provided with a blocking piece inserted into the fall prevention groove, and a top surface of the blocking piece forms the blocking surface.

3. The trailer coupling of claim 2 wherein the drop-preventing slot is closed at a lower end thereof, the lower end of the drop-preventing slot being located within the mounting cavity.

4. The trailer coupling of claim 1, wherein the inner wall of the mounting cavity is provided with a vertically extending blocking groove, the lower end of the blocking groove is closed, the bottom wall of the blocking groove forms the blocking surface, one side of the connecting portion is convexly provided with a falling preventing projection inserted into the blocking groove, and the bottom surface of the falling preventing projection forms the falling preventing surface.

5. The trailer coupling of claim 1 wherein the fall arrest surface is a sloped surface extending obliquely downward and the blocking surface extends obliquely upward toward the interior of the mounting cavity to mate with the sloped surface.

6. A trailer coupling as claimed in any one of claims 1 to 5 wherein a guide ramp is provided in said mounting cavity which slopes from below to above in a direction towards said blocking surface, said guide ramp being adapted to guide movement of the connection portion in a direction towards the blocking surface when the connection portion is inserted so that said fall arrest surface is above the blocking surface.

7. The trailer coupling of claim 6, wherein a side of the connecting portion facing away from the blocking surface is locked in the mounting cavity by a locking member, and the guide ramps are provided on both sides of the locking member.

8. The trailer coupling of any one of claims 1-5, wherein the connection portion comprises a main body and an insert block disposed at the top of the main body, the insert block and the top of the main body form an avoidance step, the anti-falling surface is disposed at a side of the insert block opposite to the avoidance step, when the locking member is in a locked state, a first gap between the anti-falling surface and the blocking surface is greater than a depth of a lateral surface of the avoidance step extending into the installation cavity, a second gap exists between a vertical surface of the avoidance step and an inner wall of the installation cavity, and when the locking member is in an unlocked state, the anti-falling surface moves downward in a direction away from the blocking surface to eliminate the second gap so as to avoid the blocking surface, so that the connection portion is removed from the installation cavity.

9. The trailer coupling of any one of claims 1-5, wherein the locking member is rotatably mounted in the mounting cavity, wherein a locking groove is provided in a side of the connecting portion facing away from the blocking surface, wherein the locking member is snapped into the locking groove when in the locked state, and wherein the locking member is disengaged from the locking groove when in the unlocked state.

10. The trailer coupling of any one of claims 1-5, wherein the unlocking means comprises an unlocking ram vertically slidably mounted on the connection portion and a manually operated assembly driving the unlocking ram upwardly into the mounting cavity to switch the locking member to the unlocked state.