A riveted subframe for a tow truck

Abstract

A riveted subframe for a wrecker vehicle includes left and right subframe longitudinal beams and multiple crossbeams connecting the left and right subframe longitudinal beams. From front to rear, the crossbeams are: a front subframe crossbeam, a lifting cylinder upper support crossbeam, a telescopic cylinder fixing crossbeam, a rear tilting crossbeam, and a lifting cylinder crossbeam. Symmetrical, downward-sloping rear outrigger support tubes are fixed to both ends of the lifting cylinder crossbeam. The upper surfaces of the front subframe crossbeam, the lifting cylinder upper support crossbeam, the telescopic cylinder fixing crossbeam, and the rear tilting crossbeam are recessed downwards in the middle, with an opening on the opposite side covered and fixed with a subframe longitudinal beam connecting plate for sealing the opening of the subframe longitudinal beam. Both ends of the subframe longitudinal beam are fixed and covered with subframe longitudinal beam sealing plates. This utility model subframe can reduce weight by 30% and increase production efficiency by 20% compared to traditional steel vehicle subframes of the same type; while maintaining high torsional strength; the subframe not only occupies less space but also ensures the compactness of the chassis layout and meets strength requirements.

Description

Technical Field

[0001] This utility model relates to the field of vehicle frame technology, specifically a riveted subframe for a tow truck. Background Technology

[0002] As the core load-bearing component of the wrecker truck's superstructure system, the longitudinal beam of the subframe plays multiple key roles in the superstructure structure. For example, the subframe longitudinal beams, which support the hydraulic system and the superstructure panel, form the basic skeleton of the superstructure. They provide mounting bases and supports for core components of the hydraulic system, such as lifting cylinders, sliding plate cylinders, tilting system, and hydraulic controls. They are connected to the left and right longitudinal beams by four crossbeams through riveting, forming a rigid frame that significantly improves the overall rigidity of the subframe and ensures vehicle stability. Furthermore, they disperse dynamic loads. When the superstructure sliding plate is in operation, the longitudinal beams must withstand the downward vertical pressure and lateral force from the ramp panel's sliding track. During lifting, they must withstand the lifting force transmitted from the hydraulic cylinders through the crossbeams, as well as the pressure transmitted from the tilting base through the tilting crossbeams. Their high-strength design (mostly using high-strength steel of 600MPa or higher) effectively transfers and disperses these loads, preventing structural failure caused by localized stress concentration. In the event of a frontal collision, the longitudinal beams undergo controlled collapse through pre-set guide grooves or energy-absorbing boxes, absorbing and converting impact energy (similar to the "egg on a sponge" cushioning effect), guiding the energy to the chassis and reducing the risk of deformation of the passenger compartment. However, the current subframes of recovery vehicles all use rectangular tube welded structures, lacking modular and advanced manufacturing process design. Furthermore, the welding quality is greatly affected by the skills of the operators, resulting in poor production versatility and low production efficiency. At the same time, it increases the weight of the entire vehicle (especially detrimental to the range of electric vehicles). The lightweight aluminum alloy solution is expensive, mainly because the steel subframe structure design is unreasonable. Some structures (such as the double wishbone subframe) require a large space, affecting the compactness of the chassis layout. In addition, even if lightweight materials are used, the thickness and overall weight are still relatively heavy, which needs further improvement. Utility Model Content

[0003] In order to solve the above problems, the purpose of this utility model is to provide a riveted subframe for a tow truck.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: a riveted subframe for a wrecker vehicle, comprising left and right subframe longitudinal beams and multiple crossbeams connecting the left and right subframe longitudinal beams. The crossbeams, from front to back, are, in sequence, a front crossbeam of the subframe, a crossbeam of the upper support of the lifting cylinder, a crossbeam of the fixed telescopic cylinder, a rear tilting crossbeam, and a crossbeam of the lifting cylinder. Symmetrical and downwardly angled rear support tubes are fixed to both ends of the lifting cylinder crossbeam. The upper surface of the front crossbeam, the upper support of the lifting cylinder, the fixed telescopic cylinder, and the rear tilting crossbeam is recessed downward in the middle. The subframe longitudinal beams are hollow structures, and a subframe longitudinal beam connecting plate for sealing the opening of the subframe longitudinal beam is fixed to one side of the opening. The two ends of the subframe longitudinal beams are fixed and covered with subframe longitudinal beam sealing plates. The bottom of the opposite outer side of the subframe longitudinal beams is provided with an inwardly recessed bending structure, so that the outer edge of the subframe longitudinal beams forms a stepped structure.

[0005] Furthermore, each end of the front crossbeam of the subframe, the upper support crossbeam of the lifting cylinder, the fixed crossbeam of the telescopic cylinder, and the rear tilting crossbeam is fixed with a horizontally arranged U-shaped fixing connecting plate, and the inner end of the U-shaped fixing connecting plate is fixed and covered in the opening of the longitudinal beam of the subframe by riveting.

[0006] Furthermore, a subframe longitudinal beam reinforcing plate is fixed inside the subframe longitudinal beam of each side subframe longitudinal beam connecting plate, and the upper and lower edges of the subframe longitudinal beam reinforcing plate are bent horizontally and fixedly connected to the upper and lower horizontal inner surfaces of the subframe longitudinal beam.

[0007] Furthermore, the rear side of the upper support beam of the lifting cylinder is provided with a pair of upper support plates for connecting the lower hinge point of the lifting cylinder.

[0008] Furthermore, vertical telescopic cylinder fixing seats are fixed on both sides of the recessed part in the middle of the upper surface of the telescopic cylinder fixing beam.

[0009] Furthermore, a pair of rear-tilting crossbeam support plates are respectively provided on the left and right sides of the rear side of the rear-tilting crossbeam.

[0010] Furthermore, taillight brackets are fixed to the lower surfaces of both ends of the lifting cylinder crossbeam.

[0011] Through the above design, the subframe of this utility model for a wrecker vehicle is structurally designed to meet multiple objectives, including load-bearing capacity, movement safety, lightweighting, and production efficiency. It utilizes high-strength steel stamped longitudinal beams to replace traditional rectangular tube welded longitudinal beams, and employs a modular design for a universal crossbeam assembly. Modular design and cost optimization enhance production versatility and reduce costs. The lightweight optimized subframe design reduces weight by 30% compared to traditional steel subframes while maintaining high torsional strength. By optimizing the crossbeam structure and the longitudinal beams on both sides, such as the inwardly concave bending structure at the bottom of the outer side of the subframe longitudinal beams, a stepped structure is formed along the outer edge of the longitudinal beams. This not only reduces space usage but also creates a reinforced structure through the outwardly concave bending step, ensuring the compactness and strength requirements of the chassis layout. Attached Figure Description

[0012] The present invention will now be further described with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a top-view three-dimensional structural diagram of the present invention; Figure 3 This is a three-dimensional structural diagram of the present invention viewed from below. Detailed Implementation

[0014] like Figure 1-3 As shown, a riveted subframe for a tow truck includes left and right subframe longitudinal beams 1 and multiple crossbeams connecting the left and right subframe longitudinal beams 1. The crossbeams, from front to back, are: a front subframe crossbeam 2, a lifting cylinder upper support crossbeam 3, a telescopic cylinder fixing crossbeam 4, a rear tilting crossbeam 5, and a lifting cylinder crossbeam 6. Symmetrical and downward-sloping rear outrigger support tubes 7 are fixed to both ends of the lifting cylinder crossbeam 6. The upper surfaces of the front subframe crossbeam 2, the lifting cylinder upper support crossbeam 3, the telescopic cylinder fixing crossbeam 4, and the rear tilting crossbeam 5 are concave in the middle. The subframe longitudinal beams 1 are hollow structures, with openings on opposite sides. The opening is covered and fixed with a subframe longitudinal beam connecting plate 8 for sealing the opening of the subframe longitudinal beam 1. Both ends of the subframe longitudinal beam 1 are fixed and covered with subframe longitudinal beam sealing plates 9. The bottom of the opposite outer side of the subframe longitudinal beam 1 is provided with an inwardly recessed bending structure, so that the outer edge of the subframe longitudinal beam 1 forms a stepped structure 10. The subframe longitudinal beam 1 and the crossbeams from front to back are the subframe front crossbeam 2, the lifting cylinder upper support crossbeam 3, the telescopic cylinder fixing crossbeam 4, the rear tilting crossbeam 5, and the lifting cylinder crossbeam 6, which are fixedly connected by rivets. The subframe longitudinal beam 1 and the subframe longitudinal beam connecting plate 8 are also fixedly connected by rivets.

[0015] Specifically: Each end of the front crossbeam 2 of the subframe, the upper support crossbeam 3 of the lifting cylinder, the fixed crossbeam 4 of the telescopic cylinder, and the rear tilting crossbeam 5 is fixed with a horizontally arranged U-shaped fixing connecting plate 11, and the inner end of the U-shaped fixing connecting plate 11 is fixedly covered in the opening of the subframe longitudinal beam 1. The subframe longitudinal beam reinforcing plate 12 is also fixed inside the subframe longitudinal beam 1 on the inner side of the subframe longitudinal beam connecting plate 8 on each side, and the upper and lower edges of the subframe longitudinal beam reinforcing plate 12 are horizontally bent and riveted to the upper and lower horizontal inner sides of the subframe longitudinal beam 1 with rivets.

[0016] The rear side of the upper support beam 3 of the lifting cylinder is provided with a pair of upper support plates 13 of the lifting cylinder, and the two sides of the middle recessed part of the upper surface of the telescopic cylinder fixing beam 4 are respectively fixed with vertical telescopic cylinder fixing seats 15.

[0017] The rear tilting crossbeam 5 is provided with a pair of rear tilting crossbeam support plates 16 on the left and right sides respectively, and the lower surfaces of both ends of the lifting cylinder crossbeam 6 are respectively fixed with taillight brackets 14.

[0018] The working principle of this utility model's subframe for a wrecker is the same as that of existing wrecker subframes, but the difference lies in its structural design. This utility model's subframe is designed to meet multiple objectives, including load-bearing capacity, safety during movement, lightweighting, and production efficiency. It utilizes high-strength steel stamped longitudinal beams to replace traditional rectangular tube welded longitudinal beams, and employs a modular design for a universal crossbeam assembly. The crossbeams and longitudinal beams are connected by riveting to form an integral frame structure, achieving the goals of reducing welding, lightweighting, and improving production efficiency. The optimized subframe design can reduce weight by 30% and increase production efficiency by 20% compared to traditional steel subframes of the same type, while maintaining high torsional strength. By optimizing the crossbeam structure and the longitudinal beams on both sides, such as the inwardly concave bending structure at the bottom of the relatively outer side of the subframe longitudinal beams, a stepped structure is formed on the outer edge of the subframe longitudinal beams. This not only reduces space occupation but also creates a reinforced structure through the outwardly concave bending step structure, ensuring the compactness and strength requirements of the chassis layout.

[0019] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A riveted subframe for a wrecker vehicle, comprising left and right subframe longitudinal beams (1) and multiple crossbeams connecting the left and right subframe longitudinal beams (1), characterized in that: The crossbeams are arranged from front to back as follows: front crossbeam of subframe (2), upper support crossbeam of lifting cylinder (3), fixed crossbeam of telescopic cylinder (4), rear tilting crossbeam (5) and lifting cylinder crossbeam (6). The two ends of the lifting cylinder crossbeam (6) are respectively fixed with symmetrical and downwardly inclined rear support tubes (7). The middle part of the upper surface of the front crossbeam of subframe (2), upper support crossbeam of lifting cylinder (3), fixed crossbeam of telescopic cylinder (4) and rear tilting crossbeam (5) is recessed downward. The longitudinal beam of subframe (1) is a hollow structure, and the opening on the opposite side is covered and fixed with a longitudinal beam connecting plate (8) for sealing the opening of the longitudinal beam of subframe (1). The two ends of the longitudinal beam of subframe (1) are fixed and covered with longitudinal beam sealing plates (9). The bottom of the opposite outer side of the longitudinal beam of subframe (1) is provided with an inwardly recessed bending structure, so that the outer edge of the longitudinal beam of subframe (1) forms a stepped structure (10).

2. The riveted subframe of a wrecker vehicle as described in claim 1, characterized in that: Each end of the front crossbeam (2) of the subframe, the upper support crossbeam (3) of the lifting cylinder, the fixed crossbeam (4) of the telescopic cylinder and the rear tilting crossbeam (5) is fixed with a horizontally arranged U-shaped fixed connecting plate (11), and the inner end of the U-shaped fixed connecting plate (11) is fixed and covered in the opening of the longitudinal beam (1) of the subframe by riveting.

3. The riveted subframe of a wrecker vehicle as described in claim 1, characterized in that: The subframe longitudinal beam reinforcing plate (12) is also fixed inside the subframe longitudinal beam (1) on the inner side of the subframe longitudinal beam connecting plate (8) on each side. The upper and lower edges of the subframe longitudinal beam reinforcing plate (12) are bent horizontally and are fixedly connected to the upper and lower horizontal inner sides of the subframe longitudinal beam (1) by riveting.

4. The riveted subframe of a wrecker vehicle as described in claim 1, characterized in that: The rear side of the upper support beam (3) of the lifting cylinder is provided with a pair of upper support plates (13) of the lifting cylinder, and the upper surface of the telescopic cylinder fixing beam (4) is fixed with vertical telescopic cylinder fixing seats (15) on both sides of the middle recessed part.

5. The riveted subframe of a wrecker vehicle as described in claim 1, characterized in that: The rear side of the rear flip beam (5) is provided with a pair of rear flip beam support plates (16).

6. The riveted subframe of a wrecker vehicle as described in claim 1, characterized in that: Taillight brackets (14) are fixed to the lower surfaces of both ends of the lifting cylinder crossbeam (6).

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