Novel rear support arm for a wrecker

Abstract

This utility model provides a novel rear support arm for a tow truck, mounted on a chassis, comprising: a subframe, a first hinge seat fixed to the rear of the subframe, a first hydraulic cylinder hinged to the first hinge seat, a second hydraulic cylinder hinged to the front of the subframe, and a set of guide plates fixed below the first hinge seat on the subframe, each guide plate having a vertical guide groove; a rear support arm body, the hydraulic rod of the first hydraulic cylinder being movably connected to the guide groove via a guide assembly hinged to the rear support arm body via a rear support arm seat at the rear of the rear support arm body, the hydraulic rod of the second hydraulic cylinder being hinged to the front of the rear support arm body, and a telescopic arm connected to the rear support arm body, the telescopic arm being driven to extend and retract by a telescopic hydraulic cylinder fixed in the rear support arm body. This rear support arm body has a simple structure and can maintain a large approach angle with the vehicle being lifted during lifting, ensuring that the vehicle being lifted will not interfere with the rear support arm body.

Description

Technical Field

[0001] This utility model relates to the field of wreckers, and in particular to a novel rear support arm for wreckers. Background Technology

[0002] With the rapid development of highway transportation and the dramatic increase in car ownership, the frequency of traffic accidents and vehicle breakdowns has also risen. As crucial equipment for handling disabled, illegally parked, or illegally parked vehicles and for emergency rescue, the performance and functionality of tow trucks directly impact the efficiency and quality of roadside assistance. The rear tow arm is a key component of a tow truck, primarily used to lift the wheels, axles, or beams of accident-damaged, disabled, or illegally parked vehicles to remove them from the scene. Currently, some problems exist with common tow truck rear tow arms on the market. Traditional pivot-type rear tow arms form an angle with the ground when placed, limiting the "approach angle" of the vehicle being lifted. For vehicles with low chassis and long front overhangs, such as sports cars, their approach angle is very small. When this approach angle is smaller than the angle formed by the tow truck's rear tow arm and the ground, the vehicle will interfere with the rear tow arm during lifting, preventing it from lifting the vehicle and limiting the applicability of tow trucks. In addition, some rear trailer booms have complex structures, are inconvenient to install and maintain, and their stability and reliability during operation need to be improved. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a novel rear support arm for a tow truck. This rear support arm has a simple structure and can maintain a large approach angle with the vehicle being lifted during lifting, ensuring that the vehicle being lifted will not interfere with the rear support arm.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a novel rear tow arm for a tow truck, for mounting on a chassis, comprising:

[0005] A subframe, wherein a first hinge seat is fixed at the rear of the subframe, a first hydraulic cylinder is hingedly connected in the first hinge seat, a second hydraulic cylinder is hingedly connected at the front of the subframe, and a set of guide plates is fixed below the first hinge seat of the subframe, and vertical guide grooves are respectively opened on the two guide plates.

[0006] A rear support arm body, wherein the hydraulic rod of the first hydraulic cylinder is movably connected in the guide groove through a guide assembly, the guide assembly is hinged to the rear support arm body through the rear support arm seat at the rear of the rear support arm body, the hydraulic rod of the second hydraulic cylinder is hinged to the front of the rear support arm body, and a telescopic arm is connected in the rear support arm body, the telescopic arm being driven to extend and retract by a telescopic hydraulic cylinder fixed in the rear support arm body.

[0007] Furthermore, two second hinge seats are fixed in the middle area of ​​the front end of the subframe, and there are also two second hydraulic cylinders, which are respectively hinged to the two second hinge seats.

[0008] Furthermore, two crossbeams are fixed to the rear of the subframe, the first hinge seat is fixed to the two crossbeams, and the first hydraulic cylinder passes through the space between the two crossbeams.

[0009] Furthermore, the hydraulic rod of the first hydraulic cylinder has a connecting ring, in which a connecting sleeve is fixed. The connecting sleeve passes through the rear support arm seat, and a guide rod passes through the connecting sleeve and the connecting ring. The two ends of the guide rod extend beyond the guide groove, and the guide rod is limited by a snap ring.

[0010] Furthermore, the rear support arm includes a first support plate and a second support plate, with a reinforcing frame fixed between the first support plate and the second support plate.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The rear support arm has a simple structure and can maintain a large approach angle with the vehicle being lifted during lifting and lowering, ensuring that the vehicle being lifted will not interfere with the rear support arm body;

[0013] 2. The rear of the rear support arm body is lifted by the first hydraulic cylinder and the front of the rear support arm body is flipped by the second hydraulic cylinder, thereby achieving precise adjustment of the angle of the rear support arm body. The entire mechanism rotates flexibly during operation, effectively transmitting force and motion, ensuring the stability and reliability of the rear support arm body during lifting and lowering, reducing the probability of failure, and is applicable to lifting different vehicles.

[0014] 3. The rear tow arm can be precisely controlled to be parallel to the ground when it falls to the ground, that is, at a zero-degree angle to the ground. Therefore, it is no longer limited by the "approach angle" and can adapt to the lifting needs of various types of vehicles, including special models with low chassis and long front overhang, which greatly expands the applicability of the tow truck. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention;

[0016] Figure 2 This is a cross-sectional view of the rear support arm of this utility model;

[0017] Figure 3 This is a structural diagram of the rear support arm of this utility model from another direction;

[0018] Figure 4 This is a cross-sectional view of the rear support arm of this utility model;

[0019] In the diagram: 1. Subframe; 2. First hinge seat; 3. First hydraulic cylinder; 4. Second hydraulic cylinder; 5. Guide plate; 6. Guide groove; 7. Rear support arm body; 8. Telescopic arm; 9. Telescopic hydraulic cylinder; 10. Second hinge seat; 11. Crossbeam; 12. Connecting ring; 13. Connecting sleeve; 14. First seat plate; 15. Second seat plate; 16. Reinforcing frame; 17. Guide rod; Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] like Figures 1 to 4 The image shows a new type of rear tow arm for a tow truck, used for mounting on a chassis, comprising:

[0022] A subframe 1 is provided, with a first hinge seat 2 fixed at the rear of the subframe 1. A first hydraulic cylinder 3 is hingedly connected in the first hinge seat 2. A second hydraulic cylinder 4 is hingedly connected at the front end of the subframe 1. A set of guide plates 5 is also fixed below the first hinge seat 2 of the subframe 1. Vertical guide grooves 6 are respectively opened on the two guide plates 5.

[0023] A rear support arm body 7 is provided. The hydraulic rod of the first hydraulic cylinder 3 is movably connected in the guide groove 6 through a guide assembly. The guide assembly is hinged to the rear support arm body 7 through the rear support arm seat at the rear end of the rear support arm body 7. The hydraulic rod of the second hydraulic cylinder 4 is hinged to the front of the rear support arm body 7. A telescopic arm 8 is connected in the rear support arm body 7. The telescopic arm 8 is driven to extend and retract by a telescopic hydraulic cylinder 9 fixed in the rear support arm body 7. (The connection of the telescopic arm 8 in the rear support arm body 7 is a common structure of the rear support arm body. The end of the telescopic arm has a limiting crossbar. Most telescopic structures of rear support arm bodies on the market are like this and can be purchased directly. It will not be described in detail here.)

[0024] In use, when the rear support arm body 7 needs to be lowered, the second hydraulic cylinder 4 extends, and the rear support arm body 7 rotates downward around the middle position connected to the hydraulic cylinder. At this time, the first hydraulic cylinder 3 also extends downward. Driven by the hydraulic rod of the first hydraulic cylinder 3, the tail of the rear support arm body 7 gradually descends while remaining parallel to the ground until it contacts the ground. Finally, driven by the telescopic hydraulic cylinder 9 of the rear support arm body 7, the telescopic arm 8 extends, giving it sufficient length to support the disabled vehicle. When it is necessary to lift the disabled vehicle, the first hydraulic cylinder 3 retracts, pushing the rear support arm body 7 upward. The rear support arm body 7 lifts the vehicle through the part in contact with the disabled vehicle. During the lifting process, the second hydraulic cylinder 4 retracts, ensuring the stability of the rear support arm body 7 and avoiding interference between the rear support arm body 7 and the vehicle.

[0025] Furthermore, two second hinge seats 10 are fixed in the middle of the front end of the subframe 1, and there are also two second hydraulic cylinders 4, which are hinged to the two second hinge seats 10 respectively. Specifically, in order to keep the rear support arm body 7 stable and balanced in force when it rises, and to avoid overloading of a single hydraulic cylinder, two second hinge seats 10 are provided in the middle of the front end of the subframe 1, and correspondingly, there are also two second hydraulic cylinders 4.

[0026] Furthermore, two crossbeams 11 are fixed to the rear of the subframe 1, the first hinge seat 2 is fixed to the two crossbeams 11, and the first hydraulic cylinder 3 passes through the space between the two crossbeams 11. Specifically, the subframe 1 of this utility model has a hollow structure, with two crossbeams 11 arranged in the middle cavity, and the first hinge seat 2 is fixed to the crossbeams 11. The first hydraulic cylinder 3 passes through the space between the crossbeams 11, making the structure of the rear support arm more compact and occupying less space.

[0027] Furthermore, the hydraulic rod of the first hydraulic cylinder 3 has a connecting ring 12, in which a connecting sleeve 13 is fixed. The connecting sleeve 13 passes through the rear support arm seat, and a guide rod passes through the connecting sleeve 13 and the connecting ring 12. The two ends of the guide rod 17 extend beyond the guide groove 6, and the guide rod 17 is limited by a snap ring. Specifically, the bottom of the first hydraulic cylinder 3 is fixed with a connecting ring 12, and the connecting sleeve 13 in the connecting ring 12 is hinged in the rear support arm seat. At the same time, the guide rod connected in the connecting sleeve 13 passes through the guide groove 6 and is positioned by a snap ring. In this way, the guide rod is limited. When the first hydraulic cylinder 3 moves downward, the guide rod can only move in the guide groove 6, thereby realizing the lifting and lowering of the rear of the rear support arm body 7. This makes the overall angle between the rear support arm body 7 and the ground smaller, and the approach angle between the rear support arm body 7 and the lifted vehicle larger, ensuring that there is no interference with the lifted vehicle.

[0028] Furthermore, the rear support arm seat includes a first seat plate 14 and a second seat plate 15, with a reinforcing frame 16 fixed between the first seat plate 14 and the second seat plate 15. Specifically, the rear support arm seat of this utility model includes a first seat plate 14 and a second seat plate 15, with a reinforcing frame 16 fixed between the two seat plates to enhance the strength of the seat plates and prevent deformation during lifting and lowering.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A novel rear tow arm for a tow truck, used for mounting on a chassis, characterized in that, include: A subframe, wherein a first hinge seat is fixed at the rear of the subframe, a first hydraulic cylinder is hingedly connected in the first hinge seat, a second hydraulic cylinder is hingedly connected at the front of the subframe, and a set of guide plates is fixed below the first hinge seat of the subframe, and vertical guide grooves are respectively opened on the two guide plates. A rear support arm body, wherein the hydraulic rod of the first hydraulic cylinder is movably connected in the guide groove through a guide assembly, the guide assembly is hinged to the rear support arm body through the rear support arm seat at the rear of the rear support arm body, the hydraulic rod of the second hydraulic cylinder is hinged to the front of the rear support arm body, and a telescopic arm is connected in the rear support arm body, the telescopic arm being driven to extend and retract by a telescopic hydraulic cylinder fixed in the rear support arm body.

2. The novel rear support arm of a tow truck according to claim 1, characterized in that: Two second hinge seats are fixed in the middle area of ​​the front end of the subframe, and there are also two second hydraulic cylinders, which are respectively hinged to the two second hinge seats.

3. The novel rear support arm of a tow truck according to claim 2, characterized in that: Two crossbeams are fixed at the rear of the subframe, the first hinge seat is fixed on the two crossbeams, and the first hydraulic cylinder passes through the space between the two crossbeams.

4. The novel rear support arm of a tow truck according to claim 3, characterized in that: The first hydraulic cylinder has a connecting ring on its hydraulic rod, and a connecting sleeve is fixed in the connecting ring. The connecting sleeve passes through the rear support arm seat, and a guide rod passes through the connecting sleeve and the connecting ring. The two ends of the guide rod extend beyond the guide groove, and the guide rod is limited by a snap ring.

5. A novel rear support arm for a tow truck according to claim 4, characterized in that: The rear support arm includes a first support plate and a second support plate, and a reinforcing frame is fixed between the first support plate and the second support plate.

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