Foldable trailer connecting piece

Abstract

The utility model relates to a foldable trailer connecting piece. Belongs to the technical field of tow hooks. The trailer arm is used for being connected with a tractor, the ball cup is used for installing a trailer ball, and the U-shaped connecting base is provided with a plurality of installing holes. The ball cup comprises a ball mounting part and a connecting part; at least two pin holes are formed in the connecting part; and the ball cup is connected with the U-shaped connecting seat through the mounting hole, the pin hole and the pin shaft. According to the utility model, the U-shaped connecting seat is additionally arranged, and the ball cup is connected with the U-shaped connecting seat through at least two pin shafts, so that the ball cup can rotate relative to the U-shaped connecting seat, and the ball cup can be folded when no traction task exists; when a traction task exists, the ball cup can be unfolded; for specific folding and unfolding operations, only one pin shaft is reserved by disassembling the pin shaft; after the two pin shafts are installed, the ball cup can be fixed.

Description

Technical Field

[0001] The utility model relates to a trailer connecting piece, in particular to a foldable trailer connecting piece, and belongs to the technical field of trailer hooks. Background Art

[0002] In recent years, more and more people are traveling by car. Some of them pay attention to the quality of life during travel, and the equipment capacity of an off-road vehicle alone can no longer meet their needs. Therefore, the trailer caravan market has gradually flourished. Since the trailer vehicle has no cab, the cable structure cannot be used; the tractor and trailer must be rigidly connected, and the two must be able to rotate relative to each other, otherwise it cannot adapt to the road.

[0003] In the prior art, a ball head connection device is usually used; a ball head is installed at the rear end of the tractor, and a ball head cover that can cooperate with the ball head is installed at the front end of the trailer. This connection method ensures that the tractor and the trailer are rigidly connected and can rotate flexibly, so that the "tractor-trailer" combined structure can travel normally on urban and rural roads.

[0004] For example, the utility model patent with the authorization announcement number CN 220242910U discloses a vehicle towing rear trailer device, which includes a trailer slot device and a trailer hook device, wherein the trailer slot device is composed of a trailer hook connecting column, a trailer arm and a ball head trailer, wherein the trailer hook connecting column is provided with a first through-type circular hole, wherein a positioning pin is provided in the first through-type circular hole, wherein the positioning pin is locked by a positioning clamp, wherein the trailer hook device is composed of a frame connecting plate and a trailer hook sleeve, wherein the trailer hook sleeve is provided with a trailer hook slot hole, wherein the trailer hook sleeve is provided with a second through-type circular hole, wherein the first through-type circular hole of the trailer hook connecting column corresponds to the second through-type circular holes provided on both sides of the trailer hook sleeve. It can be seen that the patent is designed based on a ball head and a ball head cover.

[0005] However, after the trailer device is installed on the tractor, it will obviously protrude from the rear end of the car; when the tractor has no traction task, the device becomes a burden, which affects the operations of reversing, turning, parking, etc. on the one hand, and is easy to hit other objects and cause damage on the other hand; if it is to be disassembled, it will take a lot of time, and it will be inconvenient to reinstall it when there is a traction task next time. Utility Model Content

[0006] The utility model aims to solve the above problems, thereby providing a foldable trailer connector. The trailer connector of the utility model can be folded when there is no towing task, and significantly reduces the length of the trailer device protruding from the rear end of the car, with little effect on the normal operation of the vehicle, such as reversing, turning, parking, etc.

[0007] The technical solution of the utility model to solve the above problems is as follows:

[0008] A foldable trailer connector comprises a trailer arm for connecting a tractor and a ball head seat for mounting a trailer ball, and also comprises a U-shaped connector, wherein the U-shaped connector comprises a base and a first bent portion and a second bent portion respectively arranged on both sides of the base and integrally connected to the base; a plurality of mounting holes are correspondingly arranged on the first bent portion and the second bent portion; the ball head seat comprises a ball head mounting portion and a connecting portion protruding from one end of the ball head mounting portion and fixedly connected thereto; at least two pin holes are arranged on the connecting portion; and a pin shaft is also included, wherein the ball head seat is connected to the U-shaped connector via the mounting holes, the pin holes and the pin shaft.

[0009] In the above technical solution of the utility model, the ball head seat can rotate relative to the U-shaped connecting piece, and the ball head seat can be folded when there is no traction task; when there is a traction task, the ball head seat can be unfolded. The specific folding and unfolding operations can be performed by disassembling the pin shaft until only one is retained.

[0010] As a preferred embodiment of the above technical solution, there are two pin holes, namely an upper pin hole and a lower pin hole.

[0011] As a preferred embodiment of the above technical solution, the first bending portion and the second bending portion are symmetrically arranged, and the length thereof is greater than the protruding height of the connecting portion.

[0012] As a preferred embodiment of the above technical solution, the mounting holes are arranged in two rows; and each hole position of the two rows of mounting holes corresponds one to one in height.

[0013] The mounting holes are arranged at three heights; from top to bottom, they are the first height hole, the second height hole and the third height hole; and the distances between adjacent height holes are equal.

[0014] As a preferred embodiment of the above technical solution, the pin shaft includes an end threaded pin, a sealed end nut and a B-type elastic buckle; holes for facilitating the insertion of the B-type elastic buckle are provided on the threaded section of the end threaded pin and the side wall of the sealed end nut.

[0015] As a preferred embodiment of the above technical solution, in the mounting holes, the spacing between adjacent height holes is L; the spacing between two rows of mounting holes is L; there are two pin holes, namely an upper pin hole and a lower pin hole, and the spacing between the upper pin hole and the lower pin hole is L.

[0016] As a preferred embodiment of the above technical solution, the ball head mounting portion is provided with a large round hole for facilitating the installation of the ball head.

[0017] As a preferred embodiment of the above technical solution, the large circular hole includes a through portion starting from the front position of the ball head mounting portion and a locking nut accommodating portion starting from the back position of the ball head mounting portion and connected to the through portion with a step.

[0018] As a preferred embodiment of the above technical solution, the bottom surface of the anti-loosening nut accommodating portion is provided with anti-loosening patterns arranged in a ring shape and matching with the anti-loosening patterns of the anti-loosening nut.

[0019] In summary, the utility model has the following beneficial effects:

[0020] 1. The utility model adds a U-shaped connecting seat, and connects the ball head seat with the U-shaped connecting seat through at least two pins, so that the ball head seat can rotate relative to the U-shaped connecting piece. When there is no traction task, the ball head seat can be folded up; when there is a traction task, the ball head seat can be unfolded; the specific folding and unfolding operations can be performed by disassembling the pins until only one is retained; when the two pins are installed, the ball head seat can be fixed;

[0021] 2. The pin shaft of the utility model also has the function of adjusting the tightness, which can be adjusted by rotating the end thread pin and the end nut; and it also has the function of locking. When the end nut is tightened, the B-type elastic buckle can be used to insert the hole aligned with the end thread pin and the end nut;

[0022] 3. The large round hole arranged on the ball head mounting portion of the utility model has a through portion and an anti-loosening nut accommodating portion, wherein the bottom surface of the anti-loosening nut accommodating portion is provided with anti-loosening grooves matching the anti-loosening tooth grooves of the anti-loosening nut. This structural design can prevent the locking nut of the ball head from loosening under vibration, thereby avoiding the problem of the ball head loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a top view schematic diagram of the utility model;

[0024] Figure 2 It is a side view schematic diagram of the utility model;

[0025] Figure 3 It is a bottom view of the ball head seat;

[0026] In the figure, 1-trailer arm, 2-U-shaped connecting seat, 3-ball head seat, 5-pin shaft;

[0027] 21-first bending portion, 22-second bending portion, 23-third bending portion;

[0028] 31-connecting part, 32-ball head mounting part;

[0029] 51-end threaded pin, 52-end capping nut, 53-B-type elastic buckle;

[0030] 2-1-mounting hole, 31-1-upper pin hole, 31-2-lower pin hole, 32-1-large round hole;

[0031] 32-1-1-through portion, 32-1-2-locking nut receiving portion, 32-1-2-1-locking pattern. DETAILED DESCRIPTION

[0032] The present invention is further explained below in conjunction with the accompanying drawings.

[0033] This specific implementation is only an explanation of the utility model, not a limitation of the utility model. Any changes made by those skilled in the art after reading the specification of the utility model will be protected by the patent law as long as they are within the scope of the claims.

[0034] like Figures 1 to 3 As shown, a foldable trailer connection comprises:

[0035] -Trailer arm 1, used for connecting to the tractor, installed at the rear end of the tractor;

[0036] - U-shaped connecting seat 2, fixedly mounted on the trailer arm 1, comprising a base 23, a first bending portion 21 and a second bending portion 22 connected in an integral manner; Figure 1 As shown, the top view structure of the U-shaped connecting seat 2 is U-shaped;

[0037] - A ball head seat 3, fixed on the two bent parts of the U-shaped connecting seat 2, for mounting a trailer ball. The ball head seat 3 includes a ball head mounting portion 32 and a connecting portion 31 protruding from one end of the ball head mounting portion 32 and fixedly connected thereto. The ball head seat 3 is connected to the U-shaped connecting seat 2 via the connecting portion 31.

[0038] Specific:

[0039] 1. Two rows of mounting holes 2-1 are provided on the first bending portion and the second bending portion, and each hole position of the two rows of mounting holes corresponds to each other in height; each row of mounting holes 2-1 is provided with three heights; from top to bottom, they are first height holes, second height holes and third height holes; the distance between adjacent height holes is equal, which is recorded as L;

[0040] 2. The connecting portion 31 is provided with two pin holes, namely an upper pin hole 31 - 1 and a lower pin hole 31 - 2 ; the distance between the upper pin hole 31 - 1 and the lower pin hole 31 - 2 is L;

[0041] 3. It also includes a pin shaft 5. The ball head seat 3 is connected to the U-shaped connecting seat 2 through the mounting hole 2-1, the pin hole and the pin shaft 5.

[0042] 4. The first bending portion 21 and the second bending portion 22 are symmetrically arranged, and the length (ie, the depth of the U) is greater than the protruding height of the connecting portion 31; in this way, the rotation of the connecting portion 31 within the range of the U-shaped connecting seat 2 will not be restricted.

[0043] More specifically, the pin shaft 5 includes an end threaded pin 51, an end cap nut 52 and a B-type elastic buckle 53; holes for inserting the B-type elastic buckle 53 are provided on the threaded section of the end threaded pin 51 and the side wall of the end cap nut 52.

[0044] More specifically, the ball head mounting portion 32 is provided with a large circular hole 32-1 for easy installation of the ball head. The large circular hole includes a through portion 32-1-1 starting from the front position of the ball head mounting portion 32 and a locking nut receiving portion 32-1-2 starting from the back position of the ball head mounting portion 32 and connected to the through portion with a step. The bottom surface of the locking nut receiving portion is provided with annularly arranged locking patterns 32-1-2-1 that match the locking patterns of the locking nut.

[0045] like Figure 2 As shown, when the trailer connector needs to be used, align the upper pin hole 31-1 with the mounting hole at B, then insert the end threaded plug 51, tighten the end nut 52, align the hole of the end threaded plug 51 with the hole of the end nut 52 while tightening, and finally insert the B-type elastic buckle 53. According to the above operation, use the same method to align the lower pin hole 31-2 with the mounting hole at A, and install the plug 5.

[0046] When the trailer connector needs to be folded up, remove the pin at B, pull out the B-type elastic buckle 53 at A, and loosen the end nut 52; then rotate the ball head seat 3 clockwise to align the original upper pin hole 31-1 with the installation hole at C, and then perform the above operation to install the pin at C; at the same time, tighten the previously loosened end nut 52, align the hole of the end threaded pin 51 with the hole of the end nut 52, and insert the B-type elastic buckle 53.

Claims

1. A foldable trailer connection, comprising a trailer arm (1) for connecting to a tractor and a ball head seat (3) for mounting a trailer ball, characterized in that: The invention also comprises a U-shaped connection seat (2), wherein the U-shaped connection seat (2) comprises a base (23) and a first bent portion (21) and a second bent portion (22) respectively arranged on both sides of the base and integrally connected to the base; the first bent portion and the second bent portion are correspondingly provided with a plurality of mounting holes (2-1); the ball head seat (3) comprises a ball head mounting portion (32) and a connecting portion (31) protruding from one end of the ball head mounting portion (32) and fixedly connected thereto; the connecting portion (31) is provided with at least two pin holes; and the invention also comprises a pin shaft (5), wherein the ball head seat (3) is connected to the U-shaped connection seat (2) via the mounting holes (2-1), the pin holes and the pin shaft (5).

2. A foldable trailer connector according to claim 1, characterized in that: There are two pin holes, namely an upper pin hole (31-1) and a lower pin hole (31-2).

3. A foldable trailer connector according to claim 1, characterized in that: The first bent portion and the second bent portion are symmetrically arranged, and their length is greater than the protruding height of the connecting portion (31).

4. A foldable trailer connector according to claim 1, characterized in that: The mounting holes (2-1) are arranged in two rows; each hole position of the two rows of mounting holes corresponds one to another in height.

5. The foldable trailer connector according to claim 1, characterized in that: The mounting holes (2-1) are provided with three heights; from top to bottom, they are a first height hole, a second height hole and a third height hole; and the distances between adjacent height holes are equal.

6. A foldable trailer connector according to claim 1, characterized in that: The pin shaft (5) comprises an end threaded pin (51), an end cap nut (52) and a B-type elastic buckle (53); holes for facilitating the insertion of the B-type elastic buckle (53) are provided on the threaded section of the end threaded pin (51) and on the side wall of the end cap nut (52).

7. A foldable trailer connector according to claim 4, characterized in that: In the mounting holes (2-1), the spacing between adjacent height holes is L; the spacing between two rows of mounting holes (2-1) is L; there are two pin holes, namely an upper pin hole (31-1) and a lower pin hole (31-2), and the spacing between the upper pin hole (31-1) and the lower pin hole (31-2) is L.

8. The foldable trailer connector according to claim 1, characterized in that: The ball head mounting portion (32) is provided with a large circular hole (32-1) for facilitating the installation of the ball head.

9. A foldable trailer connector according to claim 8, characterized in that: The large circular hole comprises a through portion (32-1-1) starting from the front position of the ball head mounting portion (32) and a locking nut accommodating portion (32-1-2) starting from the back position of the ball head mounting portion (32) and connected to the through portion with a step.

10. A foldable trailer connector according to claim 9, characterized in that: The bottom surface of the anti-loosening nut accommodating portion is provided with annularly arranged anti-loosening patterns (32-1-2-1) that match the anti-loosening patterns of the anti-loosening nut.

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