Anti-falling device for trailer pin shaft

Abstract

A trailer pin shaft anti-disengaging device comprises a support and a trailer pin shaft, the support is fixedly connected to a trailer frame, a positioning hole is formed in the support, the trailer pin shaft is installed in the positioning hole in a vertically movable mode, a locking block is rotatably installed at the position, located on one side of the positioning hole, of the upper portion of the support, and the locking block is connected with the trailer pin shaft. The weight of the side, away from the positioning hole, of the rotating center of the locking block is larger than that of the side, close to the positioning hole, of the locking block. A shaft ring is arranged on the upper portion of the trailer pin shaft, the diameter of the shaft ring is larger than that of the trailer pin shaft, the side, close to the positioning hole, of the locking block is locked on the upper portion of the shaft ring, and a gap capable of enabling the locking block to rotate is formed between the shaft ring and the locking block. The automobile traction pin shaft is locked through the gravity action of the locking block, the pin shaft can be effectively prevented from falling off in the running process, locking can be easily relieved in the dismounting and mounting process, no auxiliary tool is needed, and the automobile traction pin shaft locking device is simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of tractor accessories, in particular to a trailer pin shaft anti-dropping device. Background Art

[0002] Many current installation structures of trailer towing hitches use anti-dropping devices such as shackles or cotter pins, which are difficult to operate and use, and even require simple tools to achieve connection; while simple hook structures are prone to falling off the towing rope, making the connection unreliable.

[0003] The patent application number is CN202321333031.X. The utility model provides an anti-falling device for a traction bolt, which belongs to the technical field of a tractor. It includes several layers of bolt plates fixed to the rear side of the tractor, and a traction bolt is penetrated in the several bolt plates. The top of the traction bolt is hinged with a connecting plate, and an adjustment long hole parallel to the length direction of the connecting plate is opened on the connecting plate. A locking limit block is fixed on the bolt plate located at the top, and a limiting protrusion is formed on the side wall of the locking limit block. A handle ring is arranged above the locking limit block, and a longitudinal rod whose lower end is hinged in the adjustment long hole is formed below the handle ring, and the lower end of the longitudinal rod slides in the adjustment long hole. A cross bar is formed on one side of the handle ring, which forms a locking angle with the longitudinal rod. When the longitudinal rod moves downward, the bottom of the longitudinal rod is located in the adjustment long hole and close to one end of the traction bolt, and the limiting protrusion is embedded in the locking angle. The utility model has the advantages of fixing the traction bolt and preventing it from falling off, being convenient to pull out, being simple to operate and easy to install. Utility Model Content

[0004] In view of the shortcomings that the anti-slip devices such as shackles or cotter pins used in the trailer mounting structure in the above-mentioned prior art are complicated to operate and use, simple tools are needed to achieve connection, the simple hook structure is prone to falling off the traction rope, and the connection is unreliable, the utility model aims to provide a trailer pin shaft anti-slip device.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a trailer pin shaft anti-slip device, comprising a bracket and a trailer pin shaft, the bracket is fixedly connected to the trailer frame, the bracket is provided with a positioning hole, the trailer pin shaft is installed in the positioning hole so as to be movable up and down, and a locking block is rotatably installed on one side of the positioning hole above the bracket, and the weight of the locking block on the side of the rotation center away from the positioning hole is greater than its weight on the side close to the positioning hole.

[0006] A shaft collar is provided on the upper part of the trailer pin shaft, the diameter of the shaft collar is larger than the diameter of the trailer pin shaft, the locking block is locked on the upper part of the shaft collar on one side close to the positioning hole, and a gap is provided between the shaft collar and the locking block to allow the locking block to rotate.

[0007] Furthermore, the lateral length of the locking block locked on the upper part of the collar close to the positioning hole is 6-7.2 mm; and the width of the gap between the collar and the locking block is 0.2-0.4 mm.

[0008] Furthermore, the lateral length of the locking block locked on the upper part of the collar near the positioning hole is 6.6 mm; the width of the gap between the collar and the locking block that allows the locking block to rotate is 0.3 mm.

[0009] Furthermore, a locking block bracket is connected to one side of the positioning hole above the bracket, and the locking block is rotatably mounted on the locking block bracket.

[0010] Furthermore, the locking block is rotatably mounted on the locking block bracket via a bolt and a locking nut.

[0011] Furthermore, a first rubber pad is provided on the lower side of the collar, and a second rubber pad is provided on the upper side of the collar.

[0012] Furthermore, a third rubber pad is provided on the bracket below a side of the locking block away from the positioning hole.

[0013] Furthermore, the bracket is fixedly connected to the trailer frame by welding.

[0014] The utility model discloses a trailer pin shaft anti-dropping structure, which is mainly composed of a bracket, a trailer pin shaft, a locking block bracket, a locking block, a bolt, a locking nut, a traction rope and a rubber pad.

[0015] The bracket is welded to the car frame, the trailer pin is installed in the positioning hole of the bracket and can move up and down, the lock block is installed on the lock block bracket through bolts and locking nuts, the lock block can rotate around the bolts, and the rubber pad can reduce vibration noise during driving.

[0016] In the utility model, the locking block adopts an eccentric design, and the weight of the right part of the rotation center is much greater than the weight of the left part. In the natural assembly state, the locking block is pressed against the rubber pad on the right side under the action of gravity. In this state, the trailer pin shaft cannot be pulled upward. During driving, the trailer pin shaft can have a small up and down jump, but it can never pass over the left side of the locking block. The locking block is installed on the locking block bracket by bolts and locking nuts, and can rotate around the bolts. It can always remain in the locked position under the action of gravity, thereby limiting the axial displacement of the trailer pin shaft and achieving a locking effect.

[0017] When towing is required and the towing rope is hung, the locking block is rotated counterclockwise. At this time, there is a small gap between the shaft ring of the trailer pin and the left side of the locking block, which can ensure that the trailer pin can be pulled out or removed. After putting on the towing rope for the trailer, the trailer pin is installed back on the bracket and the locking block is released. The locking block will automatically rotate to the locked position, and normal towing operations can be carried out.

[0018] The anti-drop device with patent application number CN202321333031.X has a completely different structure from the present invention, and its operation and use method are also different. There is also a self-locking device for the traction bolt on the tractor and a self-locking device for the traction bolt on the tractor, and the structure is also quite different from the present invention.

[0019] Compared with the prior art, the utility model has the following beneficial effects: the utility model uses the gravity of one end of the lock block to lock the automobile traction pin shaft, which can effectively prevent the pin shaft from falling off during operation, and can easily release the lock during disassembly and assembly, without any auxiliary tools, and the structure is simple and easy to operate. The utility model is a simple and applicable trailer pin shaft anti-falling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 This is a front view schematic diagram of the utility model in a locked state;

[0022] Figure 2 It is a side schematic diagram of the utility model in a locked state;

[0023] Figure 3 for Figure 1 The large sample picture at A in the middle;

[0024] Figure 4 This is a front view of the utility model in an open state;

[0025] Figure 5 This is a side schematic diagram of the utility model in an open state;

[0026] Figure 6 for Figure 4 The large sample picture at B in the middle;

[0027] In the figure: 1, bracket; 2, trailer pin shaft; 3, towing rope; 4, first rubber pad; 5, second rubber pad; 6, locking block bracket; 7, locking block; 8, third rubber pad; 9, bolt; 10, locking nut. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0029] like Figures 1 to 6 As shown, a trailer pin shaft anti-slip device includes a bracket 1 and a trailer pin shaft 2, wherein the bracket 1 is fixedly connected to the trailer frame, a positioning hole is provided on the bracket 1, and the trailer pin shaft 2 is installed in the positioning hole so as to be movable up and down, and a locking block 7 is rotatably installed on one side of the positioning hole above the bracket 1, and the weight of the locking block 7 on the side of the rotation center away from the positioning hole is greater than the weight on the side close to the positioning hole.

[0030] A shaft collar is provided on the upper part of the trailer pin shaft 2, and the diameter of the shaft collar is larger than the diameter of the trailer pin shaft 2. The locking block 7 is locked on the upper part of the shaft collar close to the positioning hole, and a gap is provided between the shaft collar and the locking block 7 to allow the locking block 7 to rotate.

[0031] Preferably, the lateral length of the locking block 7 locked on the upper part of the collar close to the positioning hole is 6-7.2 mm; the width of the gap between the collar and the locking block 7 that allows the locking block 7 to rotate is 0.2-0.4 mm.

[0032] Preferably, a locking block bracket 6 is connected to one side of the positioning hole above the bracket 1 , and the locking block 7 is rotatably mounted on the locking block bracket 6 .

[0033] Preferably, the locking block 7 is rotatably mounted on the locking block bracket 6 via a bolt 9 and a locking nut 10 .

[0034] Preferably, a first rubber pad 4 is provided on the lower side of the collar, and a second rubber pad 5 is provided on the upper side of the collar.

[0035] Preferably, a third rubber pad 8 is provided on the bracket 1 below the locking block 7 on a side away from the positioning hole.

[0036] Preferably, the bracket 1 is fixedly connected to the trailer frame by welding. Example

[0037] like Figures 1 to 6As shown, based on the technical solution of embodiment 1, a trailer pin shaft anti-slip device includes a bracket 1 and a trailer pin shaft 2, the bracket 1 is fixedly connected to the trailer frame, a positioning hole is provided on the bracket 1, the trailer pin shaft 2 is installed in the positioning hole so as to be movable up and down, a locking block 7 is rotatably installed on one side of the positioning hole above the bracket 1, and the weight of the locking block 7 on the side of the rotation center away from the positioning hole is greater than the weight on the side close to the positioning hole.

[0038] A shaft collar is provided on the upper part of the trailer pin shaft 2, and the diameter of the shaft collar is larger than the diameter of the trailer pin shaft 2. The locking block 7 is locked on the upper part of the shaft collar close to the positioning hole, and a gap is provided between the shaft collar and the locking block 7 to allow the locking block 7 to rotate.

[0039] Preferably, the lateral length of the locking block 7 locked on the upper part of the collar close to the positioning hole is 6.6 mm; the width of the gap between the collar and the locking block 7 that allows the locking block 7 to rotate is 0.3 mm.

[0040] like Figures 1 to 6 As shown, the anti-slip devices such as shackles or cotter pins used in the trailer mounting structure in the prior art are troublesome to operate and use, and even simple tools are needed to achieve connection. The simple hook structure is easy to fall off the traction rope, and the connection is unreliable. In order to solve the above technical problems, the utility model is a trailer pin shaft anti-slip device, which is mainly composed of a bracket 1, a trailer pin shaft 2, a locking block bracket 6, a locking block 7, a bolt 9, a locking nut 10, a traction rope 3 and a first rubber pad 4, a second rubber pad 5 and a third rubber pad 8.

[0041] The bracket 1 is welded to the automobile frame, the trailer pin shaft 2 is installed in the positioning hole of the bracket and can move up and down, the locking block 7 is installed on the locking block bracket 6 through the bolt 9 and the locking nut 10, the locking block 7 can rotate around the bolt 9, and the first rubber pad 4, the second rubber pad 5 and the third rubber pad 8 can reduce vibration noise during driving.

[0042] The locking block 7 in the technical solution of the utility model adopts an eccentric design, and the weight of the right part of the rotation center is much greater than the weight of the left part. In the natural assembly state, the locking block 7 is pressed downward against the third rubber pad 8 on the right side under the action of gravity. In this state, the trailer pin 2 cannot be pulled upward. During driving, the trailer pin 2 can have a small up and down jump, but it can never pass the left side of the locking block 7. The locking block 7 is installed on the locking block bracket 6 by means of bolts 9 and locking nuts 10, and can rotate around the bolts 9. It can always remain in the locked position under the action of gravity, thereby limiting the axial displacement of the trailer pin 2 and achieving a locking effect.

[0043] When towing operation is required and the towing rope is hung, the locking block 7 is rotated counterclockwise. At this time, there is a small gap between the shaft ring of the trailer pin shaft 2 and the left side of the locking block 7, which can ensure that the trailer pin shaft 2 can be pulled out or removed. After the towing rope 3 for the trailer is put on, the trailer pin shaft 2 is installed back on the bracket 1, and the locking block 7 is released. Then, the locking block 7 automatically rotates to the locked position, and normal towing operation can be carried out.

[0044] The technical solution of the utility model reasonably designs the movement trajectory of the lock block 7, and controls the axial movement of the trailer pin shaft 2. The lock block 7 is designed eccentrically, and gravity is used to lock the axial movement of the trailer pin shaft 2. The lock block 7 is easily rotated to release the lock of the trailer pin shaft 2, which is simple and applicable.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A trailer pin shaft anti-dropout device, comprising a bracket (1) and a trailer pin shaft (2), wherein the bracket (1) is fixedly connected to a trailer frame, and is characterized in that: The bracket (1) is provided with a positioning hole, the trailer pin shaft (2) is installed in the positioning hole so as to be movable up and down, a locking block (7) is rotatably installed above the bracket (1) and located on one side of the positioning hole, and the weight of the locking block (7) at the side of the rotation center away from the positioning hole is greater than the weight at the side close to the positioning hole; A shaft collar is provided on the upper portion of the trailer pin shaft (2), the diameter of the shaft collar being larger than the diameter of the trailer pin shaft (2), the locking block (7) being locked on the upper portion of the shaft collar at a side close to the positioning hole, and a gap is provided between the shaft collar and the locking block (7) to allow the locking block (7) to rotate.

2. The trailer pin anti-slip device according to claim 1, characterized in that: The lateral length of the locking block (7) locked on the upper part of the shaft collar at one side close to the positioning hole is 6 to 7.2 mm; and the width of the gap between the shaft collar and the locking block (7) is 0.2 to 0.4 mm.

3. The trailer pin anti-slip device according to claim 2, characterized in that: The lateral length of the locking block (7) locked on the upper part of the shaft ring close to the positioning hole is 6.6 mm; the width of the gap between the shaft ring and the locking block (7) that allows the locking block (7) to rotate is 0.3 mm.

4. The trailer pin anti-slip device according to claim 1, characterized in that: A locking block bracket (6) is connected to one side of the positioning hole above the bracket (1), and the locking block (7) is rotatably mounted on the locking block bracket (6).

5. The trailer pin anti-slip device according to claim 4, characterized in that: The locking block (7) is rotatably mounted on the locking block bracket (6) via a bolt (9) and a locking nut (10).

6. The trailer pin anti-slip device according to claim 1, characterized in that: A first rubber pad (4) is provided on the lower side of the collar, and a second rubber pad (5) is provided on the upper side of the collar.

7. The trailer pin anti-dropout device according to claim 1, characterized in that: A third rubber pad (8) is provided on the bracket (1) below the locking block (7) on a side away from the positioning hole.

8. The trailer pin anti-slip device according to claim 1, characterized in that: The bracket (1) is fixedly connected to the trailer frame by welding.

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