A linear traction device

Abstract

The present invention discloses a linear traction device, comprising a tractor housing, a universal joint for connecting to a load trailer provided at the front end of the tractor housing, a traction rod extending forward and backward provided within the tractor housing, a tractor inner housing fixedly provided at the front end of the traction rod, a transverse core provided within the tractor inner housing, the left and right ends of the transverse core extending outward to the left and right side walls of the tractor housing, a tension and pressure sensor provided within the tractor inner housing behind the transverse core for measuring the traction force between the front and rear sides, a buffer provided within the tractor housing on the front inner wall of the tractor housing, and a traction ring provided at the rear end of the traction rod, extending through the rear wall of the tractor housing, for connecting to a vehicle. This device is used for connecting front and rear vehicles and can meet the requirements of turning, road undulation, vehicle buffering, and traction force monitoring.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering equipment, and in particular relates to a linear traction device. Background Art

[0002] Load trailers are essential road test equipment for conducting vehicle performance R&D and testing, including thermal balance tests, traction performance tests, braking performance tests, tire characterization, and failure analysis. The load trailer is typically connected to the test vehicle using a drawbar, which must not only ensure reliability but also provide safety, cushioning performance, and the ability to monitor force.

[0003] A typical tow bar consists of two towing rings and a buffer whose core component is a spring. The structure disclosed in Chinese patent application (CN201821146090.5) is the most representative. This structure mainly consists of a sleeve, a slide bar, a tension spring, a fork frame, etc. A fixed ring is provided at one end of the sleeve, which is connected to the vehicle via the fork frame, and a clip hole is provided at the other end of the slide bar, which is connected to the vehicle. In this structure, due to the fixed rings and clip holes used at both ends of the tow bar, only rotation within the water surface is possible, and the ability to adjust for vertical misalignment of the front and rear vehicles caused by factors such as uneven road conditions is lacking. The tension spring buffer design cannot accurately measure the traction force of the tow bar. At the same time, the lack of a traction force monitoring device in this structure makes it inconvenient to measure the subsequent tensile force, making it impossible to meet the testing requirements of the load trailer test. Summary of the Invention

[0004] The present invention intends to provide a linear traction device for connecting front and rear vehicles, which can meet the turning requirements of front and rear vehicles, the road undulation requirements of front and rear vehicles, the vehicle buffering requirements, and the traction force monitoring requirements.

[0005] To this end, the present invention adopts a technical solution: a linear traction device comprising a rectangular tractor housing, a universal joint for connecting to a load trailer provided at a front end of the tractor housing, a partition provided within the tractor housing, the partition dividing the tractor housing into a front chamber and a rear chamber, a traction rod extending forward and backward provided within the rear chamber, the front end of the traction rod passing through the rear chamber and fixedly attached to a square tractor inner shell located within the front chamber, a rectangular cross core provided within the tractor inner shell, the left and right ends of the cross core extending outwardly to the left and right side walls of the front chamber, a tension and pressure sensor provided within the tractor inner shell for measuring the traction force between the front and rear sides provided in front of the cross core, the front end of the tension and pressure sensor abutting the front inner wall of the tractor inner shell, a buffer provided within the front chamber, mounted on the front inner wall of the front chamber with its rear end facing the front end of the tractor inner shell, a traction ring for connecting to a vehicle provided at the rear end of the traction rod passing through the rear wall of the rear chamber, the axes of the two circular holes in the rear chamber, the front and rear ends of the traction rod respectively passing through, being aligned horizontally.

[0006] As a preferred embodiment of the above scheme, a partition is provided in the tractor housing, which divides the tractor housing into a front chamber and a rear chamber. The tractor inner shell, cross core, pressure sensor and buffer are all located in the front chamber.

[0007] Further preferably, mounting grooves are provided on the left and right side walls of the tractor housing, and the mounting grooves include a sensor groove extending forward and backward as a front section and a horizontal core mounting groove extending upward and downward as a rear section. After installation, the left and right ends of the horizontal core are exactly flush with the left and right side walls of the tractor housing.

[0008] Further preferably, the tractor inner shell adopts a mouth-shaped frame composed of front, rear, upper and lower side surfaces, and the left and right sides of the tractor inner shell are through-connected.

[0009] Further preferably, a guide sleeve for the traction rod to pass through is provided on the rear wall and the partition of the traction device housing.

[0010] More preferably, the tractor housing is made of stainless steel, and the guide sleeve is made of copper.

[0011] Further preferably, a derivative bracket for connecting the universal joint to the load trailer is also provided.

[0012] Further preferably, a rolling bearing is provided in the traction ring.

[0013] Further preferably, the traction ring is composed of two semicircular rings connected by bolts.

[0014] Beneficial effects of the present invention:

[0015] 1) One end of the device is connected to the front vehicle through a universal joint, and the other end is connected to the rear vehicle through a traction ring. This not only meets the steering requirements of the front and rear vehicles when they turn, but also meets the vertical bouncing requirements of the front and rear vehicles when the road surface is uneven;

[0016] 2) A buffer is installed inside the tractor housing, and the buffer is located between the front inner wall of the tractor housing and the front end of the tractor inner shell. When the front and rear vehicles squeeze each other, the rear vehicle has a forward impact force due to inertia, which pushes the tractor inner shell through the traction rod to squeeze the buffer, thereby playing a buffering role;

[0017] 3) A tension-pressure sensor is installed between the cross core and the front inner wall of the tractor inner shell. When the front and rear vehicles are in the traction state, the traction force drives the rear vehicle to move through the universal joint - tractor shell - cross core - tension-pressure sensor - tractor inner shell - traction rod - traction ring. At this time, the tension-pressure sensor is compressed and can measure the traction force between the front and rear vehicles. When the front and rear vehicles are in the compression state, the force passes through the universal joint - tractor shell - buffer - tractor inner shell - traction rod - traction ring, and the tension-pressure sensor is disengaged.

[0018] 4) The traction rod is arranged in the rear chamber, and its front and rear ends pass through the front and rear inner walls of the rear chamber respectively, and the axes of the circular holes when passing through the front and rear inner walls are on the same horizontal straight line, so that when it is subjected to force, it can ensure that the traction rod moves in a straight line, that is, the traction force is transmitted in a straight line, thereby reducing the loss of traction force transmitted in the traction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is an exploded view of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below by way of examples and in conjunction with the accompanying drawings:

[0022] like Figure 1-2As shown, a linear traction device mainly consists of a tractor housing 1, a universal joint 2, a drawbar 3, a tractor inner housing 4, a cross core 5, a tension and pressure sensor 6, a buffer 7, and a traction ring 8. The universal joint 2 for connecting to a load trailer is located at the front end of the tractor housing 1. The tractor housing 1 includes a drawbar 3 extending forward and backward. The front end of the drawbar 3 is fixed to the tractor inner housing 4 located within the tractor housing 1. The cross core 5 is located within the tractor inner housing 4, with its left and right ends extending outward to the left and right side walls of the tractor housing 1. A tension and pressure sensor 6 for measuring the traction force between the front and rear sides is located in front of the cross core 5. The front end of the tension and pressure sensor 6 abuts against the front inner wall of the tractor inner housing 4. A buffer 7 is located within the tractor housing 1 and is mounted on the front inner wall of the tractor housing 1, with its rear end facing the front end of the tractor inner housing 4. The rear end of the tractor rod 3 passes through the rear wall of the tractor housing 1 and is provided with a traction ring 8 for connecting to the vehicle.

[0023] A partition 1a is installed within the tractor housing 1, dividing it into a front chamber A and a rear chamber B. The tractor inner housing 4, cross core 5, pressure sensor 6, and buffer 7 are all located within the front chamber A. The rear side of the tractor inner housing 4 abuts against the partition 1a. The axes of the front and rear ends of the drawbar 3, which extend through the two circular holes in the rear chamber B, are aligned horizontally. The presence of the rear chamber B requires the drawbar 3 to pass through the entire rear chamber B, ensuring that the drawbar 3 and the tractor inner housing 4 move linearly when the entire device is subjected to tension or compression. Furthermore, the partition 1a ensures that the tractor inner housing 4 and tractor housing 1 operate together when the front and rear vehicles are pulled.

[0024] To facilitate the installation of the transverse core 5 and the tension and pressure sensors 6, mounting slots 1b are provided on the left and right sidewalls of the tractor housing 1. These slots consist of a front sensor slot a and a rear transverse core mounting slot b. Sensor slot a extends forward and backward, while transverse core mounting slot b extends vertically. The tractor inner housing 4 is constructed as a mouth-shaped frame consisting of front, rear, upper, and lower side surfaces, with the left and right sides extending through. Ideally, the left and right ends of the transverse core 5, after installation, are flush with the corresponding left and right sidewalls of the tractor housing 1.

[0025] To facilitate the movement of the drawbar within the tractor housing 1, a guide sleeve 9 is provided on the rear wall and partition 1a of the tractor housing 1 for the drawbar to pass through. To extend the service life of the entire device, the tractor housing 1 is made of stainless steel, and to facilitate the forward and backward movement of the drawbar, the guide sleeve 9 is made of copper.

[0026] The entire device is also equipped with a derivative bracket for connecting the universal joint 2 to the load trailer. When it is installed on the load trailer, it can be directly installed on the crossbeam of the load trailer through the universal joint 2, or connected to the longitudinal beam of the load trailer through the derivative bracket.

[0027] In order to facilitate the front and rear vehicles to turn more smoothly, a rolling bearing is provided in the traction ring 8.

[0028] To facilitate the installation of the towing ring 8, the towing ring 8 is composed of two semicircular rings connected by bolts, so that it can be installed on the rear vehicle like a hoop.

[0029] The force transmission method of this device during specific use is as follows: when the traction rod is under tension, the force transmission path is universal joint - traction device housing - cross core - tension pressure sensor - traction device inner housing - traction rod - traction ring; when the traction rod is under pressure, the force transmission path is universal joint - traction device housing - buffer - traction device inner housing - traction rod - traction ring.

Claims

1. A linear traction device, characterized in that: The invention comprises a rectangular tractor shell (1), wherein a universal joint (2) connected to a load trailer is provided at the front end of the tractor shell (1), and a partition (1a) is provided in the tractor shell (1), wherein the partition (1a) divides the tractor shell (1) into a front chamber (A) and a rear chamber (B), wherein a traction rod (3) extending forward and backward is provided in the rear chamber (B), wherein the front end of the traction rod (3) passes through the rear chamber (B) and is fixedly provided with a square tractor inner shell (4) located in the front chamber (A), wherein a rectangular cross core (5) is provided in the tractor inner shell (4), and the left and right ends of the cross core (5) extend outward to the left and right sides of the front chamber (A) On the wall, a tension and pressure sensor (6) for measuring the traction force between the front and rear sides is provided in front of the transverse core (5) and is located in the tractor inner shell (4). The front end of the tension and pressure sensor (6) is against the front inner wall of the tractor inner shell (4). A buffer (7) is provided in the front chamber (A). The buffer (7) is installed on the front inner wall of the front chamber (A), and the rear end is facing the front end of the tractor inner shell (4). The rear end of the traction rod (3) passes through the rear wall of the rear chamber (B) and is provided with a traction ring (8) for connecting with the vehicle. The axes of the two circular holes of the rear chamber (B) at the front and rear ends of the traction rod (3) are on the same horizontal straight line.

2. The linear traction device according to claim 1, characterized in that: The left and right side walls of the tractor housing (1) are provided with mounting grooves (1b), the mounting grooves (1b) comprising a sensor groove (a) extending forward and backward as a front section, and a transverse core mounting groove (b) extending upward and downward as a rear section, and the left and right ends of the transverse core (5) after installation are exactly flush with the left and right side walls of the tractor housing (1).

3. The linear traction device according to claim 1, characterized in that: The tractor inner shell (4) adopts a mouth-shaped frame body composed of front, rear, upper and lower side surfaces, and the left and right sides of the tractor inner shell (4) are through-set.

4. The linear traction device according to claim 1, characterized in that: A guide sleeve (9) for the traction rod to pass through is provided on the rear wall and the partition (1a) of the traction device housing (1).

5. The linear traction device according to claim 4, characterized in that: The material of the tractor housing (1) is stainless steel, and the material of the guide sleeve (9) is a copper sleeve.

6. The linear traction device according to claim 1, characterized in that: It is also equipped with a derivative bracket for connecting the universal joint (2) to the load trailer.

7. The linear traction device according to claim 1, characterized in that: A rolling bearing is provided in the traction ring (8).

8. The linear traction device according to claim 1, characterized in that: The traction ring (8) is composed of two semicircular rings connected by bolts.

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