Trailer coupling

Abstract

The trailer coupler comprises a mounting base, a trailer hook, a locking piece and an unlocking device, a mounting cavity opened downwards is formed in the mounting base, and the trailer hook comprises a hooking part and a connecting part fixedly connected with the hooking part; the locking piece has 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 that the locking piece can be switched from the locking state to the unlocking state, the inner wall of the mounting cavity is provided with a blocking face, the connecting part is provided with an anti-falling face, and the anti-falling face is provided with a locking groove. And when the locking piece is in an unlocking state, the anti-falling surface can be hung on the blocking surface to prevent the tow hook from falling. According to the trailer coupler, when the locking piece is in the unlocking state, the trailer hook can be prevented from falling suddenly, so that the safety of a user is protected, and then the use experience of the user is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile technology, in particular to a trailer coupler. BACKGROUND

[0002] With the continuous change of people's lifestyle, more and more people have more demands on the carrying performance of the automobile. The existing automobile widely adopts a fixed trailer hook. The trailer hook is directly or indirectly connected to the support structure of the automobile through an adaptive chassis. This installation method has the following problems: because the hooking part of the trailer hook permanently extends beyond the rear bumper, the appearance of the automobile is reduced, and the safety function of the rear bumper of the automobile is weakened, which causes a safety hazard to the user. In addition, the trailer hook extending beyond the rear bumper will damage other vehicles during parking operation, causing economic losses to the user.

[0003] In order to overcome the above-mentioned shortcomings, the prior art discloses a detachable trailer coupler, which comprises a mounting seat, a trailer hook mounting seat, a locking member and an unlocking device. The mounting seat is provided with a downwardly open mounting cavity. The bottom of the mounting cavity is provided with a socket. The trailer hook comprises a connecting part. The connecting part is inserted into the mounting cavity through the socket. The locking member has 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 to drive the locking member to act so as to switch it from the locking state to the unlocking state. In this way, when the trailer hook is not needed, it can be detached from the mounting seat for storage, thereby avoiding the above-mentioned problems. However, when the trailer hook is detached, the locking member is in the unlocking state. Therefore, when the user does not pull the trailer hook, the trailer hook will fall and injure the user, thereby reducing the user's experience. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a trailer coupler which can prevent the trailer hook from suddenly falling when the locking member is in the unlocking state, thereby protecting the safety of the user and improving the user's experience.

[0005] To solve the above-mentioned technical problems, the present application adopts the following technical solutions:

[0006] The trailer coupler comprises a mounting seat, a trailer hook, a locking member and an unlocking device. The mounting seat is provided with a downwardly open mounting cavity. The trailer hook comprises a hooking part and a connecting part fixedly connected with the hooking part. The locking member has 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 to drive the locking member to act so as to switch it from the locking state to the unlocking state. The inner wall of the mounting cavity is provided with a blocking surface. The connecting part is provided with an anti-falling surface. When the locking member is in the unlocking state, the anti-falling surface can be hung on the blocking surface to prevent the trailer hook from falling.

[0007] 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, and the inner wall of the mounting cavity is provided with a blocking block inserted into the anti-falling groove, and the top surface of the blocking block forms the blocking surface.

[0008] In the trailer coupler, the lower end of the anti-falling groove is closed, and the lower end of the anti-falling groove is located in the mounting cavity.

[0009] In the trailer coupler, 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 part is provided with an anti-falling protrusion inserted into the blocking groove, and the bottom surface of the anti-falling protrusion forms the anti-falling surface.

[0010] In the trailer coupler, the anti-falling surface is an inclined surface extending downward, and the blocking block extends upward and downward to cooperate with the inclined surface.

[0011] In the trailer coupler, the mounting cavity is further provided with a guide inclined surface inclined from bottom to top towards the direction of the blocking surface, and the guide inclined surface is used to guide the connecting part to move towards the direction of the blocking surface during insertion, so that the anti-falling surface is located above the blocking surface.

[0012] In the trailer coupler, one side of the connecting part opposite to the blocking surface is locked in the mounting cavity by a locking member, and the guide inclined surface is arranged on both sides of the locking member.

[0013] In the trailer coupler, the connecting part includes a main body and an insertion block arranged on the top of the main body, the insertion block and the top of the main body form an avoidance step, the anti-falling surface is arranged on the side of the insertion block opposite to the avoidance step, when the locking member is in the locked state, the 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, and the second gap exists between the vertical surface of the avoidance step and the inner wall of the mounting cavity, when the locking member is in the unlocked state, the anti-falling surface moves downward to eliminate the first gap and then moves away from the blocking surface to eliminate the second gap to avoid the blocking surface, so that the connecting part is pulled out of the mounting cavity.

[0014] In the trailer coupler, the locking member is rotatably arranged in the mounting cavity, one side of the connecting part opposite to the blocking surface is provided with a lock groove, when the locking member is in the locked state, the locking member is clamped into the lock groove, and when the locking member is in the unlocked state, the locking member is separated from the lock groove.

[0015] In the above trailer coupler, the unlocking device comprises an unlocking jack and a manually operated assembly, the unlocking jack is vertically slidingly installed on the connecting part, and the manually operated assembly drives the unlocking jack to move upward into the installation cavity to switch the locking member to the unlocked state.

[0016] The present application has the following advantages:

[0017] When the trailer hook is disassembled, the locking member is in the unlocked state, at this time the trailer hook moves downward under the action of gravity, and the connecting part is hung on the blocking surface through the anti-falling surface, which can prevent the trailer hook from falling suddenly, thereby protecting the safety of the user and improving the user experience.

[0018] 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, and the inner wall of the installation cavity is provided with a blocking block inserted into the anti-falling groove, and the top surface of the blocking block forms a blocking surface. By designing in this way, the weight of the trailer hook can be reduced by setting the anti-falling groove, so that the disassembly of the trailer hook is more labor-saving, and the overall structure is relatively simple, easy to process and form, and the manufacturing cost of the trailer coupler is reduced.

[0019] The lower end of the anti-falling groove is closed, and the lower end of the anti-falling groove is located in the installation cavity. By designing in this way, the anti-falling groove can be hidden in the installation cavity to increase the appearance of the trailer coupler, and dust and foreign matter can be prevented from entering the anti-falling groove and the installation cavity, so that the trailer hook cannot be pulled out downward to realize disassembly.

[0020] The anti-falling surface is an inclined surface extending downward, and the blocking block extends upward toward the inside of the installation cavity to cooperate with the inclined surface. By designing in this way, the anti-falling surface can be hooked on the blocking surface to increase the stability of the anti-falling surface hung on the blocking surface, and further prevent the trailer hook from falling.

[0021] The installation cavity is also provided with a guide inclined surface inclined from bottom to top toward the direction of the blocking surface, and the guide inclined surface is used to guide the connecting part to move toward the direction of the blocking surface when the connecting part is inserted, so that the anti-falling surface is located above the blocking surface. By designing in this way, the anti-falling surface can be smoothly located above the blocking surface through the guide inclined surface when the connecting part is inserted into the installation cavity, that is, the anti-falling surface can be located above the blocking surface after the connecting part is inserted in place, without the need to adjust the position of the connecting part separately, thereby reducing the assembly difficulty of the trailer hook.

[0022] The side of the connecting part opposite to the blocking surface is locked in the installation cavity through the locking member, and the guide inclined surface is arranged on both sides of the locking member. By designing in this way, the guide stability of the guide inclined surface to the connecting part can be improved, and the connecting part can be prevented from being stuck when being inserted. By moving the connecting part toward the direction of the blocking surface, the locking member can smoothly act to lock the connecting part in the installation cavity.

[0023] The connecting part comprises a main body and an insertion block arranged on the top of the main body, the insertion block and the top of the main body form an avoiding step, the anti-falling surface is arranged on the side opposite to the avoiding step, when the locking member is in the locking state, the first gap between the anti-falling surface and the blocking surface is larger than the depth of the transverse surface of the avoiding step extending into the mounting cavity, the second gap exists between the vertical surface of the avoiding step and the inner wall of the mounting cavity, when the locking member is in the unlocking state, the anti-falling surface moves downward to eliminate the first gap and then moves to the direction away from the blocking surface to eliminate the second gap so as to avoid the blocking surface, and the connecting part is pulled out from the mounting cavity.

[0024] The locking member is rotationally arranged in the mounting cavity, the side of the connecting part away from the blocking surface is provided with a locking slot, when the locking member is in the locking state, the locking member is clamped into the locking slot, and when the locking member is in the unlocking state, the locking member is separated from the locking slot. In this way, the structure is simple, easy to process and form, and the manufacturing cost of the trailer coupling is reduced.

[0025] The features and advantages of the present application will be described in detail in the following specific embodiments, drawings.

DRAWINGS

[0026] The present application will be further described below in combination with the drawings:

[0027] Figure 1 It is a structure schematic view of the trailer coupling installed on the vehicle body in the embodiment one of the present application;

[0028] Figure 2 It is an exploded schematic view of the trailer hook in the embodiment one of the present application;

[0029] Figure 3 It is a partial structure schematic view of the unlocking device in the embodiment one of the present application;

[0030] Figure 4 It is a sectional view of the partial structure of the unlocking device installed on the main body in the embodiment one of the present application;

[0031] Figure 5 It is a structure schematic view of the plugging plate in the embodiment one of the present application;

[0032] Figure 6 It is a structure schematic view of the trailer hook in the embodiment one of the present application;

[0033] Figure 7 It is an exploded schematic view of the mounting seat in the embodiment one of the present application;

[0034] Figure 8 Explanatory drawing of the mounting seat part structure in the first embodiment of the present application;

[0035] Figure 9 Sectional view of the seat body in the first embodiment of the present application;

[0036] Figure 10 Sectional view of the locking member locking the connecting part in the mounting cavity in the first embodiment of the present application;

[0037] Figure 11 Sectional view of the locking member in the first embodiment of the present application; Figure 10 Sectional view of A-A in the first embodiment of the present application;

[0038] Figure 12 Sectional view of B-B in the first embodiment of the present application; Figure 10 Sectional view of B-B in the first embodiment of the present application;

[0039] Figure 13 Sectional view of the locking member disengaging the locking slot in the first embodiment of the present application.

[0040] Reference signs:

[0041] 001, anti-collision beam; 002, connecting plate; 100, mounting seat; 110, seat body; 111, mounting cavity; 1111, limiting surface; 1112, blocking surface; 1113, guide inclined surface; 112, first through hole; 113, second through hole; 114, mounting opening; 1141, main opening; 1142, fool-proof opening; 115, third positioning part; 116, limiting groove; 117, recess; 120, locking member; 121, first conical arc surface; 122, first plug-in part; 123, avoiding slot; 124, fool-proof boss; 130, rotating shaft; 131, holding end; 132, insertion end; 133, second plug-in part; 134, positioning lug; 140, elastic reset member; 141, twisted leg; 150, upper cover plate; 160, sealing plug cover; 170, lifting jacking rod; 200, trailer hook; 210, hooking part; 220, connecting part; 2201, locking slot; 22010, second conical arc surface; 221, main body; 2211, first positioning part; 2210, cavity; 222, plugging plate; 2221, boss; 2222, positioning groove; 2223, first limiting surface; 2224, guide groove; 223, plug; 224, anti-falling groove; 2241, anti-falling surface; 230, unlocking jacking rod; 240, manual operation assembly; 241, knob; 242, cam; 2421, rotating part; 2422, extension part; 243, cam rotating shaft; 2431, non-cylindrical segment; 2432, limiting boss; 24321, second positioning part; 2433, cylindrical segment; 244, connecting shaft sleeve; 245, clasp spring; 246, sealing ring; 247, sealing gasket.

DETAILED DESCRIPTION

[0042] The present application provides a trailer coupler, comprising a mounting seat, a trailer hook, a locking member and an unlocking device, the mounting seat is internally provided with a downwardly open mounting cavity, the trailer hook comprises a hooking part and a connecting part fixedly connected with the hooking part, the locking member has a locking state of locking the connecting part in the mounting cavity and an unlocking state of releasing the locking of the connecting part, the unlocking device is used for driving the locking member to act to switch it from the locking state to the unlocking state, the inner wall of the mounting cavity is provided with a blocking surface, the connecting part is provided with an anti-falling surface, and when the locking member is in the unlocking state, the anti-falling surface can be hung on the blocking surface to prevent the trailer hook from falling.

[0043] In the present application, when the trailer hook is disassembled, the locking member is in the unlocking state, at this time the trailer hook moves downward under the action of gravity, and the connecting part is hung on the blocking surface through the anti-falling surface, so that the sudden falling of the trailer hook is prevented, thereby protecting the safety of the user and improving the use experience of the user.

[0044] The technical solutions of the embodiments of the present application will be explained and described below in combination with the drawings of the embodiments of the present application, but the following embodiments are only preferred embodiments of the present application, not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. In addition, it should be understood that the words indicating the orientation or position relationship such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "vertical", "horizontal", "top", "bottom" and the like in the following description are only based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device / element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0045] Embodiment one

[0046] Reference Figures 1 to 13As shown, the trailer coupler in the embodiment includes a mounting seat 100, a trailer hook 200, a locking piece 120 and an unlocking device, the mounting seat 100 is fixedly connected on the connecting plate 002 of the anti-collision beam 001 by screws, the mounting seat 100 includes a seat body 110, the seat body 110 is provided with an installation cavity 111, the lower end of the installation cavity 111 is open to form a socket, the trailer hook 200 includes a hooking part 210 and a connecting part 220, the hooking part 210 is L-shaped, the connecting part 220 is integrally processed with the transverse segment of the hooking part 210 to realize fixed connection of the two, the connecting part 220 vertically extends upward and is inserted into the installation cavity 111 upward through the socket, the locking piece 120 has a locking state of locking the connecting part 220 in the installation cavity 111 and an unlocking state of unlocking the connecting part 220, the unlocking device is used to drive the locking piece 120 to act to switch it from the locking state to the unlocking state, the inner wall of the installation cavity 111 is provided with a blocking surface 1112, the connecting part 220 is provided with an anti-falling surface 2241, when the locking piece 120 is in the unlocking state, the anti-falling surface 2241 can be hung on the blocking surface 1112 to prevent the trailer hook 200 from falling.

[0047] When the trailer hook 200 is disassembled, the locking piece 120 will be in the unlocking state, at this time, the trailer hook 200 will move downward under the action of gravity, and the connecting part 220 can prevent the trailer hook 200 from suddenly falling by being hung on the blocking surface 1112 through the anti-falling surface 2241, thereby protecting the safety of the user and improving the use experience of the user.

[0048] Specifically, as Figures 2 to 6 、 Figure 10 、 Figure 12As shown, the connecting part 220 in the embodiment includes a main body 221 provided with a cavity 2210, a blocking plate 222, and an insertion block 223 provided on the top of the main body 221. The insertion block 223 is integrally formed on the top of the main body 221. One side of the cavity 2210 is provided with an open end. The unlocking device includes an unlocking top rod 230 and a manually operated assembly 240. The unlocking top rod 230 vertically slides through the top wall of the cavity 2210. The manually operated assembly 240 includes a knob 241, a cam 242, a cam 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, etc. Preferably, the first non-circular hole and the second non-circular hole are both D-shaped holes. The cam shaft 243 includes a non-cylindrical section 2431, a limiting boss 2432 provided at one end of the non-cylindrical section 2431, and a cylindrical section 2433 provided at the other end of the non-cylindrical section 2431. The limiting boss 2432 is limited outside the cavity 2210. The non-cylindrical section 2431 penetrates through the cavity 2210, the first non-circular hole, and the second non-circular hole. The cylindrical section 2433 penetrates through the knob 241 and is sleeved with a clamping spring 245 to realize the connection between the cam shaft 243 and the knob 241. The connecting shaft sleeve 244 has a non-cylindrical section matched with the knob 241. Thus, the rotation of the knob 241 can drive the connecting shaft sleeve 244, the cam shaft 243, and the cam 242 to synchronously rotate. After assembly, the bottom end of the unlocking top rod 230 abuts against the curved surface of the cam 242. When the knob 241 drives the cam 242 to rotate upward, the unlocking top rod 230 can be driven to move upward. When the knob 241 drives the cam 242 to rotate downward, the unlocking top rod 230 moves downward to reset under the action of gravity. In addition, such design has a relatively simple structure and facilitates the assembly of the cam 242 and the cam shaft 243, thereby further reducing the assembly difficulty of the unlocking device. Finally, compared with the electric unlocking device, the manual unlocking can not only make the structure of the unlocking device simpler, thereby facilitating the assembly of the trailer hook 200 and improving the assembly efficiency of the trailer hook 200, but also can reduce the problem that the trailer hook 200 cannot be disassembled due to electrical failure.

[0049] In addition, as Figure 3 、 Figure 5 and Figure 10As shown, in order to further reduce the difficulty of assembling the unlocking device, in this embodiment, the inner side surface of the blocking plate 222 is provided with a boss 2221 located in the cavity 2210, and the boss 2221 is provided with a positioning groove 2222. The cam 242 includes a rotating part 2421 that cooperates with the cam shaft 243 and an extension part 2422 that is connected to the outer peripheral side of the rotating part 2421. The rotating part 2421 is confined in the positioning groove 2222, and the boss 2221 is provided with a first limiting surface 2223 located below the positioning groove 2222. One side of the extension part 2422 cooperates with the first limiting surface 2223 so that the cam 242 is hung on the boss 2221. With such a design, the posture of the cam 242 hung on the boss 2221 can be limited by the first limiting surface 2223 to ensure the posture of the first non-circular hole. During assembly, the cam 242 is first hung on the boss 2221 for pre-positioning, and then the cam shaft 243 is passed through the main body 221 and the cam 242. It can be seen that when the cam 242 is assembled, there is no need to manually maintain the posture of the first non-circular hole, thereby further reducing the assembly difficulty of the unlocking device; finally, the blocking plate 222 is installed on the main body 221 by screws. With such a design, the blocking plate 222 can be detachably connected to facilitate the later disassembly or maintenance of the cam 242.

[0050] 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 push rod 230 is inserted into the guide groove 2224 through the opening and vertically slides in the guide groove 2224. This design allows the unlocking push rod 230 to be guided in its vertical movement by the guide groove 2224, thereby preventing the unlocking push rod 230 from deflecting and getting stuck during its vertical movement.

[0051] like Figure 6 As shown, in order to further facilitate the assembly of the cam shaft 243, in this embodiment, a first positioning portion 2211 is provided on the surface of the main body 221, and the first positioning portion 2211 is a positioning countersunk hole or a positioning convex 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 into 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 segment 2431 can be aligned with the transmission plane of the first non-circular hole, so that the non-cylindrical segment 2431 can smoothly pass through the first non-circular hole, and there is no need to rotate the cam shaft 243 to make the transmission plane of the non-cylindrical segment 2431 aligned with the transmission plane of the first non-circular hole, thereby further reducing the difficulty of assembling the cam shaft 243 and the cam, and further reducing the difficulty of assembling the unlocking device.

[0052] Secondly, in order to prevent dust and water from entering the cavity 2210, a sealing ring 246 is further sleeved outside the limiting boss 2432 and the connecting shaft sleeve 244, the axial section of the sealing ring 246 is a V-shaped structure with an opening facing the outside, so as to improve the sealing reliability, and a sealing gasket 247 is clamped between the blocking plate 222 and the main body 221. In this way, the dustproof and waterproof effect can be achieved through the sealing gasket 247, so as to avoid that foreign matter in the cavity 2210 causes the cam 242 to be unable to move, thereby affecting the disassembly of the trailer hook 200.

[0053] It should be noted that in the embodiment, the insert block 223 and the top of the main body 221 form a clearance space for avoiding the unlocking top rod 230, and the side of the insert block 223 facing the clearance space (i.e., the side facing away from the blocking surface 1112) is partially recessed to form a locking groove 2201, which is an arc-shaped groove. In the embodiment, part of the connecting portion 220 is inserted into the installation cavity 111, i.e., the insert block 223 is inserted into the installation cavity 111, and the locking of the insert block 223 is achieved by clamping the locking piece 120 into the locking groove 2201. When the unlocking top rod 230 moves upward, it can enter the clearance space to push the locking piece 120 to rotate upward and thereby release the locking of the connecting portion 220.

[0054] As shown in FIG. 1, Figures 7 to 9 In the embodiment, the mounting seat 100 is further provided with a rotating shaft 130 penetrating the installation cavity 111, and the locking piece 120 is a fan-shaped plate, which is sleeved on the rotating shaft 130 and can rotate. The seat body 110 is provided with coaxially arranged first and second through holes 112 and 113 on opposite sides thereof, the first and second through holes 112 and 113 communicate with the installation cavity 111, the rotating shaft 130 has a holding end 131 and an insertion end 132, the first through hole 112 corresponds to the holding end 131, the hole diameter 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 hole diameter of the second through hole 113, the rotating shaft 130 penetrates the first through hole 112, the installation cavity 111 and the second through hole 113 in sequence, and an elastic stop ring is sleeved on the insertion end 132, the elastic stop ring is larger than the hole diameter of the second through hole 113, so as to axially limit the rotating shaft 130 on the seat body 110 through the holding end 131 and the elastic stop ring. The locking piece 120 is rotatably sleeved on the part of the rotating shaft 130 located in the installation cavity 111, so as to achieve the rotation of the locking piece 120 in the installation cavity 111. In the embodiment, the locking piece 120 is rotatably installed in the installation cavity 111, and the unlocking device is installed on the connecting portion 220 of the trailer hook 200. When the locking piece 120 or the unlocking device needs to be repaired, the mounting seat 100 or the trailer hook 200 can be separately disassembled, so that the disassembly and repair of the trailer coupler are more simple and convenient. Finally, the unlocking device is arranged on the trailer hook 200, which can also make the unlocking device away from the chassis, so as to facilitate the user to operate the unlocking device and improve the user experience.

[0055] Further, the mounting cavity 111 of the embodiment is further provided with an elastic reset member 140, the elastic reset member 140 is a torsion spring, the torsion spring has two torsion legs 141, the locking member 120 is provided with a first plug-in part 122 on the fan-shaped surface of the side facing the first perforation 112, the first plug-in part 122 is a conical countersunk hole, the rotating shaft 130 includes a shaft body and a limiting plate provided at one end of the shaft body, the outer diameter of the limiting plate is larger than the outer diameter of the shaft body, the limiting plate forms the above-mentioned holding end 131, the other end of the shaft body forms an insertion end 132, an annular boss between the outer diameters of the shaft body and the holding end 131 is provided, the annular boss is provided with a second plug-in part 133, the second plug-in part 133 is a slot extending along the axis of the shaft body, the torsion spring is sleeved on the shaft body, one of the torsion legs 141 is inserted into the conical countersunk hole, and the other torsion leg is inserted into the slot, so that the locking member 120 can be driven to rotate and reset to be clamped into the locking groove 2201 by the restoring force of the torsion spring, without the need for additional complex structure to drive the locking member 120 to rotate and reset, only one torsion spring is needed, thereby simplifying the structure of the mounting seat 100 and the trailer coupler, and improving the assembly efficiency of the trailer coupler; in addition, the design of the first plug-in part 122 and the second plug-in part 133 also facilitates the assembly of the torsion spring, further reduces the assembly difficulty of the mounting seat 100, and improves the assembly efficiency of the mounting seat 100.

[0056] In order to facilitate the assembly of the mounting seat 100, the outer side of the seat body 110 is provided with a third positioning part 115 and a limiting groove 116 located at the outer periphery of the first perforation 112 and arranged circumferentially, the third positioning part 115 is a positioning blind hole or a positioning protrusion, preferably a positioning blind hole, the outer periphery of the limiting plate is provided with a positioning lug 134, the top of the seat body 110 is provided with a mounting opening 114 communicating with the mounting cavity 111, and the inner wall of the mounting cavity 111 is provided with a second limiting surface 1111 located directly below the mounting opening 114 and extending downwardly and downwardly toward the locking groove 2201. The mounting seat 100 further includes an upper cover plate 150 mounted on the top of the seat body 110 by screws to shield the mounting opening 114, a sealing gasket is arranged between the upper cover plate 150 and the seat body 110 to achieve sealing and shielding of the mounting opening 114, realize dustproof and waterproof effect, avoid the existence of foreign matters in the mounting cavity 111 to cause the rotating failure of the locking member 120, and further affect the disassembly of the trailer hook 200. One side of the seat body 110 is further provided with a groove 117, and the second perforation 113 is arranged on the bottom wall of the groove 117.

[0057] When assembling the mounting base 100, first, the locking member 120 is inserted into the mounting cavity 111 through the mounting opening 114, and the radial side surface of the locking member 120 is matched with the second limiting surface 1111, so that the first insertion part 122 and the third positioning part 115 are located on the same straight line through the pre-positioning of the locking member 120 by the second limiting surface 1111. Then, the nylon gasket, the sealing sheet and the torsion spring are sequentially sleeved on the rotating shaft 130, and one torsion leg 141 of the torsion spring is inserted into the second insertion part 133. At this time, the positioning lug 134, the second insertion part 133 and the two torsion legs 141 are located on the same straight line. Then, the combination is sequentially inserted into the base body 110 through the first through hole 112, the locking member 120 and the second through hole 113. During the insertion, the positioning lug 134 on the rotating shaft 130 is first aligned with the third positioning part 115. In this way, when the rotating shaft 130 penetrates the base body 110, the other torsion leg 141 of the torsion spring can be smoothly inserted into the conical counterbore hole along the guide conical surface of the conical counterbore hole. At this time, the rotating shaft 130 is rotated by an angle, so that the positioning lug 134 is embedded into the limiting groove 116. In this way, the locking member 120 is tightly attached to the second limiting surface 1111 under the torsion of the torsion spring, so as to prevent the locking member 120 from shaking after the trailer hook is disassembled and colliding with the wall part of the mounting cavity 111 to generate noise. At the same time, the rotating of the rotating shaft 130 relative to the base body 110 is also avoided. Then, the elastic retaining ring is clamped on the insertion end 132 of the rotating shaft 130 to fix the rotating shaft 130 and prevent it from falling off. Finally, the sealing plug 160 is inserted into the groove 117, and the upper cover plate 150 and the sealing gasket are installed on the top of the base body 110. In this way, the assembly of the mounting base 100 is completed.

[0058] It should be noted that the sealing plug 160 is also provided with two threaded blind holes. When the sealing plug 160 needs to be disassembled, the screw is screwed on the sealing plug 160, and then the sealing plug 160 can be taken out from the groove 117 by pulling the screw outward.

[0059] When the trailer coupler in the embodiment is used, if the trailer hook 200 needs to be assembled for hooking, first, it is ensured that the unlocking top rod 230 is in the state of downward resetting. Then, the connecting part 220 is inserted into the mounting cavity 111 through the insertion opening. During the insertion into the mounting cavity 111, the insertion block 223 will rotate upward around the rotating shaft 130 against the locking member 120. When the connecting part 220 is assembled in place, the locking member 120 is reset downward under the torsion of the torsion spring and clamped into the locking groove 2201, so as to lock the connecting part 220 in the mounting cavity 111. At this time, the locking member 120 is abutted against the second limiting surface 1111 and is in the locked state (as shown in FIG. 6). Figure 10As shown), in this way, the second limiting surface 1111 can prevent the locking member 120 from rotating downward when in the locked state, so as to prevent the trailer hook 200 from driving the locking member 120 to rotate downward under the action of its own gravity or the action of external force to disengage the locking groove 2201, that is, to prevent the trailer hook 200 from falling off, thereby improving the locking reliability of the locking member 120 on the connecting portion 220. If it is necessary to remove the trailer hook 200 for storage, the knob 241 is rotated to make the cam shaft 243 drive the cam 242 to rotate upward, so that the cam 242 drives the unlocking push rod 230 to move upward, and the unlocking push rod 230 enters the installation cavity 111 and pushes the locking member 120 to rotate upward and disengage the locking groove 2201, so as to release the locking member 120 from the connecting portion 220. At this time, the locking member 120 is in the unlocked state (as shown). Figure 13 shown).

[0060] It is understandable that in other embodiments of the present invention, the elastic reset member may also be a tension spring provided between the locking member and the second limiting surface, and the tension spring is used to drive the locking member to rotate and reset and snap into the lock groove.

[0061] It is understandable that in other embodiments of the present invention, the cam shaft is connected to the motor, and the motor drives the cam shaft to rotate the cam, which can move the unlocking push rod upward to push the locking member to rotate upward and disengage from the lock slot.

[0062] like Figure 9 and Figure 13 As shown, in order to prevent the trailer hook 200 from suddenly falling and injuring the user when the locking member 120 is in the unlocked state, a vertically extending anti-falling groove 224 is provided on the side of the plug block 223 away from the lock groove 2201 in this embodiment. The upper end of the anti-falling groove 224 is closed, and the top wall of the anti-falling groove 224 forms the above-mentioned anti-falling surface 2241. A blocking block is convexly provided on the inner wall of the installation cavity 111, and the top surface of the blocking block forms the blocking surface 1112. The connecting portion 220 is locked in the installation cavity 11 1, the blocking block is inserted into the anti-fall groove 224, and the blocking surface 1112 is located below the anti-fall surface 2241. In this way, when the locking member 120 is in the unlocked state, the anti-fall surface 2241 can be hung on the blocking surface 1112 to prevent the trailer hook 200 from falling. The overall structure is relatively simple and easy to process and form, which reduces the manufacturing cost of the trailer coupler. In addition, the design of the anti-fall groove can also reduce the weight of the trailer hook 200, so that the disassembly and assembly of the trailer hook 200 is more labor-saving.

[0063] Preferably, the anti-fall surface 2241 is an inclined surface extending obliquely downward, and the blocking surface 1112 extends obliquely upward toward the inside of the installation cavity 111. When the anti-fall surface 2241 is hung on the blocking surface 1112, the blocking surface 1112 cooperates with the inclined surface. Such a design can enable the anti-fall surface 2241 to be hooked on the blocking surface 1112, thereby increasing the stability of the anti-fall surface 2241 hanging on the blocking surface 1112, and further preventing the trailer hook 200 from falling.

[0064] Preferably, the lower end of the anti-fall groove is closed and located in the mounting cavity 111. This design not only allows the anti-fall groove to be hidden in the mounting cavity 111 to enhance the appearance of the trailer coupler, but also prevents dust and foreign matter from entering the anti-fall groove and the mounting cavity 111, thereby preventing the trailer hook 200 from being pulled downward for removal.

[0065] In addition, if Figure 13 As shown, in this embodiment, the plug block 223 and the top of the main body 221 form an avoidance step, the vertical surface of the avoidance step is provided with the above-mentioned lock groove 2201, the unlocking push rod 230 passes through the horizontal surface of the avoidance step, the size of the plug block 223 is smaller than the size of the socket, and the size of the main body 221 matches the size of the socket, so that when the locking member 120 is in the locked state, the main body 221 can block the socket, and when the locking member 120 is in the locked state, the anti-falling surface 2241 is located above the blocking surface 1112, and the first gap between the anti-falling surface 2241 and the blocking surface 1112 is H1, and the depth of the horizontal surface of the avoidance step extending into the installation cavity 111 is H2, satisfying H1>H2, and there is a second gap W1 between the vertical surface of the avoidance step and the inner wall of the installation cavity 111. When the anti-fall surface 2241 is hung on the blocking surface 1112, the fitting width of the two is W2, satisfying W1>W2. After the anti-fall surface 2241 is hung on the blocking surface 1112, when the connecting part 220 is subsequently removed from the installation cavity 111, it is necessary to first lift the trailer hook 200 so that the anti-fall surface 2241 is located above the blocking surface 1112 and ensure that the horizontal surface of the avoidance step is located outside the installation cavity 111. Then, move the trailer hook 200 toward the side away from the blocking surface 1112 to eliminate the second gap, so that the vertical projection of the anti-fall surface 2241 is completely located outside the vertical projection of the blocking surface 1112, that is, the anti-fall surface 2241 avoids the blocking surface 1112. Finally, pull the trailer hook 200 downward to remove the connecting part 220 from the installation cavity 111.

[0066] Moreover, the guiding slope 1113 is arranged on the left and right sides of the locking piece 120 in the locking state, when the connecting part 220 abuts against the bottom of the guiding slope 1113, the blocking block is located outside the anti-falling groove, that is, the blocking block is not inserted into the anti-falling groove, when the connecting part 220 abuts against the top of the guiding slope 1113, the blocking block is inserted into the anti-falling groove, and the anti-falling surface 2241 is located above the blocking surface 1112. In this way, when the connecting part 220 is inserted into the mounting cavity 111, the connecting part 220 is guided to move transversely to the blocking surface 1112 by the guiding slope 1113, so that the blocking block is inserted into the anti-falling groove 224, and the anti-falling surface 2241 is smoothly moved above the blocking surface 1112, that is, after the connecting part 220 is inserted into place, the anti-falling surface 2241 is ensured to be located above the blocking surface 1112, and there is no need to separately adjust the position of the connecting part 220, thereby reducing the assembly difficulty of the tow hook 200. When disassembling, the tow hook 200 is pushed upward so that the plug block 223 abuts against the guiding slope 1113, and the anti-falling surface 2241 is ensured to be located above the blocking surface 1112, then the tow hook 200 is pulled downward, at this time, the plug block 223 moves obliquely downward along the guiding slope 1113, that is, the tow hook 200 can be disassembled from the mounting seat 100, and disassembly is more convenient; in addition, the guiding slope 1113 is arranged on the left and right sides of the locking piece 120, which can also improve the guiding stability of the connecting part 220 to the guiding slope 1113, and avoid the connecting part 220 from being stuck when being inserted; finally, since the locking groove 2201 is arranged on the side of the connecting part 220 away from the blocking surface 1112, the locking groove 2201 can be avoided by moving the connecting part 220 to the blocking surface 1112, so that the locking piece 120 is smoothly rotated and clamped into the locking groove 2201 to lock the connecting part 220 in the mounting cavity 111.

[0067] It can be understood that in other embodiments of the present application, the inner wall of the mounting cavity is also provided with a vertical extending blocking groove, the lower end of the blocking groove is closed, the bottom wall of the blocking groove forms a blocking surface, and the connecting part is provided with an anti-falling protrusion on the side away from the locking groove, the bottom surface of the anti-falling protrusion forms an anti-falling surface, after the connecting part is inserted into place, the anti-falling protrusion is inserted into the blocking groove, so that the anti-falling surface is hung on the blocking surface to prevent the tow hook from falling.

[0068] Preferably, as Figures 6 to 9As shown, the locking member 120 in the embodiment is sleeved on the rotating shaft 130, the arc surface of the locking member 120 forms a first tapered circular arc surface 121, the locking groove 2201 has a second tapered circular arc surface 22010, the first tapered circular arc surface 121 and the second tapered circular arc surface 22010 have the same inclination direction, the axis of the first tapered circular arc surface 121, the axis of the second tapered circular arc surface 22010 and the rotation axis of the locking member 120 (i.e. the axis of the rotating shaft 130) are coaxial, the generatrix of the two tapered circular arc surfaces is inclined to the axis of the rotating shaft 130, and the distance between the two tapered circular arc surfaces and the axis of the rotating shaft 130 gradually increases towards the first perforation 112, and the torsional spring is a telescopic torsional spring, so that the locking member 120 can elastically float along the axis of the rotating shaft 130. When the locking member 120 is clamped into the locking groove 2201, the first tapered circular arc surface 121 and the second tapered circular arc surface 22010 can lock the connecting part 220 in the mounting cavity 111. When the locking member 120 is clamped into the locking groove 2201, if the locking member 120 and the locking groove 2201 have clearance fit or interference fit due to manufacturing tolerance, the locking member 120 will move along the axis of the rotating shaft 130 under the joint action of the torsional spring and the second tapered circular arc surface 22010, and since the first tapered circular arc surface 121 and the second tapered circular arc surface 22010 are both inclined to the axis of the rotating shaft 130, the movement of the locking member 120 will promote the first tapered circular arc surface 121 and the second tapered circular arc surface 22010 to contact, that is, the first tapered circular arc surface 121 and the second tapered circular arc surface 22010 have zero clearance fit, so as to lock the connecting part 220 and prevent the connecting part 220 from shaking up and down, thereby improving the mounting performance of the trailer coupling. In addition, the first tapered circular arc surface 121 and the second tapered circular arc surface 22010 are both tapered circular arc surfaces, and the first tapered circular arc surface 121 and the second tapered circular arc surface 22010 can also realize surface contact, so as to increase the contact area of the first tapered circular arc surface 121 and the second tapered circular arc surface 22010, and further increase the friction between the locking member 120 and the connecting part 220, and improve the locking effect on the connecting part 220. Finally, such design can also reduce the manufacturing precision of the locking member 120 and the locking groove 2201, thereby reducing the manufacturing cost and improving the economic benefit.

[0069] It can be understood that in other embodiments of the present application, the distance between the two tapered circular arc surfaces and the axis of the rotating shaft can also gradually decrease towards the first perforation, and such design can also realize the inclination of the first tapered circular arc surface and the second tapered circular arc surface to the axis of the rotating shaft.

[0070] As Figure 8As shown, in order to avoid the locking piece 120 being installed reversely, the locking piece 120 in the embodiment further comprises a fool-proof boss 124, which is protruded on the side sector of the sector plate facing the first through hole 112 and is sleeved outside the rotating shaft 130. The mounting port 114 comprises a main opening 1141 and a fool-proof port 1142, which is arranged on the side of the main opening 1141 facing the first through hole 112 and is in communication with the main opening 1141. When the locking piece 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 port 1142. In this way, the first conical arc surface 121 and the second conical arc surface 22010 cannot be matched due to the reverse installation of the locking piece 120, which further causes the trailer hook 200 to be unable to be assembled to the mounting seat 100, thereby avoiding the rework due to the incorrect installation and improving the assembly efficiency of the mounting seat 100 and the trailer coupler.

[0071] It can be understood that in other embodiments of the present application, the fool-proof boss can also be protruded on the side sector of the sector plate facing the second through hole, the fool-proof port is arranged on the side of the main opening facing the second through hole and is in communication with the main opening, and when the locking piece is assembled, the sector plate is installed into the mounting cavity through the main opening, and the fool-proof boss is installed into the mounting cavity through the fool-proof port. In this way, the reverse installation of the locking piece can also be prevented.

[0072] Finally, as shown in Figs. 1 and 2, Figure 7 and Figure 11 As shown, in order to enable the unlocking top rod 230 to drive the locking piece 120 to rotate upwardly and smoothly to be separated from the locking groove 2201, the mounting seat 100 in the embodiment further comprises two lifting top rods 170, which are inserted into the mounting cavity 111 through the bottom wall of the groove 117. The two lifting top rods 170 are symmetrically distributed on the two sides of the second through hole 113. The sealing plug 160 blocks the two lifting top rods 170 and simultaneously axially positions the lifting top rods 170 to prevent the lifting top rods 170 from being separated due to the axial movement. The side sector of the locking piece 120 facing the second through hole 113 is further provided with two avoiding grooves 123, which are arc grooves. The end of the lifting top rod 170 inserted into the mounting cavity 111 is a ball head. When the locking piece 120 is clamped into the locking groove 2201, the lifting top rod 170 is inserted into the avoiding groove 123. When the locking piece 120 rotates upwardly, the lifting top rod 170 is separated from the avoiding groove 123 and abuts against the side sector of the locking piece 120 facing the second through hole 113 to drive the locking piece 120 to move along the axial direction of the rotating shaft 130 and away from the lifting top rod 170 and at least partially located outside the locking groove 2201, thereby reducing the contact area between the first conical arc surface 121 and the second conical arc surface 22010 or even separating the first conical arc surface 121 from the second conical arc surface 22010. The smaller the contact area between the first conical arc surface 121 and the second conical arc surface 22010, the easier the locking piece 120 is separated from the locking groove 2201 when rotating, thereby making the disassembly of the trailer hook 200 more labor-saving.

[0073] It should be noted that 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. An activity allowance is reserved between the inner wall of the mounting cavity 111 opposite to the locking member 120 and the connecting portion 220. When the locking member 120 is lifted and pushed by the lifting rod 170 to be axially offset, the connecting portion 220 can be close to the inner wall of the mounting cavity opposite to the locking member 120, so that the first conical arc surface 121 and the second conical arc surface 22010 can be smoothly reduced in contact. However, the reserved activity allowance does not affect the normal engagement of the locking member 120 and the locking slot 2201.

[0074] It can be understood that in other embodiments of the present application, the avoiding slot can also be provided on the inner wall of the mounting cavity, and the lifting rod is installed on the side of the fan-shaped plate facing the second perforation. In this way, when the locking member rotates, the lifting rod can be forced to move axially to move away from the second perforation by being lifted out of the avoiding slot, so that the first conical arc surface 121 and the second conical arc surface 22010 can be reduced in contact or even separated in contact.

[0075] Embodiment two

[0076] Compared with embodiment one, the difference of the present embodiment is that the unlocking rod is provided with a rack portion, the manual operation assembly further includes a gear and a knob, the gear is installed in the cavity and engaged with the rack portion, the knob is connected with the gear, and the gear is driven to rotate by rotating the knob to drive the unlocking rod to move up and down. When it is needed to disassemble the trailer hook, the gear is driven to rotate by rotating the knob to drive the unlocking rod to move upward, so as to push the locking member to rotate upward to be separated from the locking slot, and then the locking of the connecting portion by the locking member is released. After disassembly is completed, reverse rotation of the knob can make the unlocking rod move downward to reset, so as to avoid that when the trailer hook and the mounting seat are assembled again, the unlocking rod interferes with the downward rotation of the locking member to make it unable to be clamped into the locking slot.

[0077] It can be understood that in other embodiments of the present application, the gear can also be connected with a motor, so that electric unlocking can be realized.

[0078] Embodiment three

[0079] Compared with embodiments one and two, the difference of the present embodiment is that the unlocking device includes an unlocking screw and an operation portion fixedly connected to the lower end of the unlocking screw, the connecting portion is provided with a vertically extending threaded hole, and the unlocking screw is threadedly connected with the threaded hole. In this way, when it is needed to disassemble the trailer hook, rotation of the operation portion can make the unlocking screw move upward to push the locking member to rotate upward to be separated from the locking slot, and then the locking of the connecting portion by the locking member is released. After disassembly is completed, reverse rotation of the operation portion can make the unlocking screw move downward to reset, so as to avoid that when the trailer hook and the mounting seat are assembled again, the unlocking screw interferes with the downward rotation of the locking member to make it unable to be clamped into the locking slot.

[0080] Embodiment four

[0081] Compared with the first to third embodiments, the difference of the present embodiment is that the locking member is rotatably installed on the side of the insertion block away from the blocking surface, and at this time, the insertion block is provided with a relief hole below the rotation axis of the locking member, and the locking slot is arranged on the inner wall of the installation cavity. When the connecting part is inserted into the installation cavity, the locking member will rotate downward around the rotation shaft into the relief hole. When the connecting part is assembled in place, the locking member will rotate upward under the action of the torsional force of the torsional spring and reset and be clamped into the locking slot, so as to lock the connecting part in the installation cavity. If it is necessary to disassemble the trailer hook for storage, the unlocking jacking rod is driven to move upward, the unlocking jacking rod enters the installation cavity and pushes the locking member to rotate upward and disengage from the locking slot, so as to release the locking of the connecting part by the locking member.

[0082] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. A trailer coupler comprising a mounting seat, a trailer hook, a locking member, and an unlocking device, wherein the mounting seat is provided with a downwardly open mounting cavity, the trailer hook comprises a hooking portion and a connecting portion fixedly connected to the hooking portion, the locking member has a locking state for locking the connecting portion within the mounting cavity and an unlocking state for releasing the locking of the connecting portion, the unlocking device is used to drive the locking member to switch it from the locked state to the unlocked state, and is characterized in that: The inner wall of the mounting cavity is provided with a blocking surface, and the connecting part is provided with an anti-falling surface. When the locking part is in the unlocked state, the anti-falling surface can be hung on the blocking surface to prevent the trailer hook from falling. The connecting part includes a main body and an insert block provided on the top of the main body, the insert block and the top of the main body form an avoidance step, and the anti-falling surface is provided on the side of the insert block opposite to the avoidance step. When the locking part is in the locked state, the first gap between the anti-falling surface and the blocking surface is greater than the depth of the transverse surface of the avoidance step extending into the mounting cavity, and there is a second gap between the vertical surface of the avoidance step and the inner wall of the mounting cavity. When the locking part is in the unlocked state, the anti-falling surface moves downward to eliminate the first gap and then moves in a direction away from the blocking surface to eliminate the second gap to avoid the blocking surface, so that the connecting part is removed from the mounting cavity.

2. The trailer coupler according to claim 1, wherein A vertically extending anti-fall groove is provided on one side of the connecting portion, the upper end of the anti-fall groove is closed, the top wall of the anti-fall groove forms the anti-fall surface, and the inner wall of the mounting cavity is provided with a blocking block inserted into the anti-fall groove, and the top surface of the blocking block forms the blocking surface.

3. The trailer coupler according to claim 2, wherein: The lower end of the anti-falling groove is closed, and the lower end of the anti-falling groove is located in the installation cavity.

4. The trailer coupler according to 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, and one side of the connecting part is provided with an anti-falling protrusion inserted into the blocking groove, and the bottom surface of the anti-falling protrusion forms the anti-falling surface.

5. The trailer coupler according to claim 1, wherein: The anti-falling surface is an inclined surface extending obliquely downward, and the blocking surface extends obliquely upward toward the inside of the installation cavity to cooperate with the inclined surface.

6. The trailer coupler according to any one of claims 1 to 5, characterized in that The locking member is rotatably installed in the installation cavity, and a locking groove is provided on the side of the connecting portion facing away from the blocking surface. When the locking member is in a locked state, the locking member is stuck in the locking groove, and when the locking member is in an unlocked state, the locking member is disengaged from the locking groove.

7. The trailer coupler according to any one of claims 1 to 5, characterized in that The unlocking device includes an unlocking push rod and a manual operation component. The unlocking push rod is vertically slidably installed on the connecting part, and the manual operation component drives the unlocking push rod to move upward into the installation cavity to switch the locking member to the unlocked state.

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