Steering system of crawler

Abstract

The utility model provides a crawler steering system which comprises a steering gear arranged on a frame, a first reversing valve, a second reversing valve, a first hydraulic motor connected with the first reversing valve and a second hydraulic motor connected with the second reversing valve, the first reversing valve and the second reversing valve are connected with the two ends of the steering gear respectively, and a third reversing valve is arranged on the frame. The third reversing valve is respectively connected with the first reversing valve and the second reversing valve, the third reversing valve is connected with an oil pump, the steering gear is connected with a steering wheel through a steering shaft, and output ends of the first hydraulic motor and the second hydraulic motor are respectively connected with driving wheels. According to the crawler steering system, the crawler is driven to advance, stop or retreat through operation of the third reversing valve, the effect of controlling the rotating direction of the driving shafts in the first hydraulic motor and the second hydraulic motor is achieved through rotation of the steering gear, reverse rotation of the two driving wheels is achieved, and therefore advancing and steering of the crawler are achieved. The crawler is simple and convenient to steer, smaller in steering radius and higher in steering efficiency.

Description

Technical Field

[0001] This utility model relates to the field of vehicle steering technology, specifically to a steering system for tracked vehicles. Background Technology

[0002] Tracked vehicles are vehicles that use a tracked running system instead of a traditional wheeled running system. They possess excellent traction and lower ground pressure, enabling them to adapt to harsh environments such as snow, hillsides, and grasslands. The tread pattern on their track plates effectively prevents the vehicle from slipping on rainy, snowy, icy, or uphill surfaces, thus making them widely used in the construction machinery industry. However, compared to wheeled vehicles, tracked vehicles have higher production costs, and wheeled vehicles are faster, consume less energy, and have better load-bearing capacity under good road conditions. The steering systems of some vehicles improve performance by adding auxiliary hydraulic pumps or complex control valve assemblies. Developing a highly efficient, energy-saving, responsive hydraulic steering system with precise torque distribution capabilities has become crucial for improving the operational efficiency of tracked vehicles.

[0003] Existing tracked vehicle steering systems are relatively complex in structure and have low steering efficiency, resulting in poor adaptability of tracked vehicles. This solution addresses this technical problem. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a tracked vehicle steering system. By operating the reversing valve three, hydraulic motor one and hydraulic motor two rotate synchronously, thereby driving the tracked vehicle forward, to stop, or to reverse. The movement of the two drive wheels of the tracked vehicle exhibits high consistency and precision. The rotation of the steering gear connects the oil ports of reversing valve one and reversing valve two, thus controlling the rotation direction of the drive shafts in hydraulic motor one and hydraulic motor two. This results in the two drive wheels rotating in opposite directions, enabling the tracked vehicle to move and turn. The tracked vehicle's steering is simple and convenient, with a smaller turning radius and higher steering efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a tracked vehicle steering system, including a steering gear mounted on a chassis, and further comprising a reversing valve one and a reversing valve two connected to both ends of the steering gear, a hydraulic motor one connected to the reversing valve one, and a hydraulic motor two connected to the reversing valve two. A reversing valve three is mounted on the chassis and is connected to the reversing valve one and the reversing valve two. An oil pump is connected to the reversing valve three. The steering gear is connected to a steering wheel via a steering shaft. The output ends of the hydraulic motor one and the hydraulic motor two are respectively connected to drive wheels.

[0006] The reversing valve three is a three-position four-way reversing valve. The working port A of the reversing valve three is connected to the inlet port P of the reversing valve one and the reversing valve two respectively through oil pipe one. The working port B of the reversing valve three is connected to the return port T of the reversing valve one and the reversing valve two respectively through oil pipe two. The inlet port P and the return port T of the reversing valve three are connected to the oil pump respectively.

[0007] The working ports A and B of the first directional control valve are respectively connected to the working ports A and B of the first hydraulic motor, and the working ports A and B of the second directional control valve are respectively connected to the working ports A and B of the second hydraulic motor.

[0008] The first directional control valve is a three-position four-way directional control valve with the same passage in the middle and right positions, and the second directional control valve is a three-position four-way directional control valve with the same passage in the middle and left positions.

[0009] The steering gear has connecting shafts rotatably mounted at both ends, and the valve stems of the first and second directional valves are respectively connected to the sides of the connecting shafts.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] (1) By operating the reversing valve three, the hydraulic motor one and the hydraulic motor two rotate synchronously, thereby driving the tracked vehicle to move forward, stop or move backward. The movement of the two drive wheels of the tracked vehicle is relatively consistent and accurate. By rotating the steering gear, the oil ports of the reversing valve one and the reversing valve two are connected, thereby controlling the rotation direction of the drive shafts in the hydraulic motor one and the hydraulic motor two, and thus realizing the opposite rotation of the two drive wheels, thereby realizing the movement and steering of the tracked vehicle. The steering of the tracked vehicle is simple and convenient, with a smaller turning radius and higher steering efficiency.

[0012] (2) The steering gear directly drives the valve stems of the first and second directional valves to swing left and right through the connecting shaft, thereby realizing the connection state of the oil ports in the first and second directional valves. The state of the hydraulic oil input to the first and second directional valves is directly adjusted by the valve stem of the third directional valve. The reversing operation of the tracked vehicle is simple, reliable, convenient and quick. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the connection structure between the reversing valve one and the reversing valve two of this utility model and the steering gear;

[0015] Figure 3 This is a schematic diagram of the steering system of the tracked vehicle when it moves forward in this utility model;

[0016] Figure 4 This is a schematic diagram of the left-turn steering system of the tracked vehicle of this utility model;

[0017] Figure 5 This is a schematic diagram of the left-position oil port connection state of the reversing valve of this utility model;

[0018] Figure 6 This is a schematic diagram of the intermediate oil port connection state of the reversing valve of this utility model;

[0019] Figure 7 This is a schematic diagram of the right-position oil port connection state of the reversing valve of this utility model;

[0020] Figure 8 This is a utility model Figure 5 Internal structure diagram of the first directional control valve;

[0021] Figure 9 This is a utility model Figure 6 Internal structure diagram of the first directional control valve;

[0022] Figure 10 This is a utility model Figure 7 A schematic diagram of the internal structure of the reversing valve.

[0023] In the diagram: 1. Steering gear; 2. Directional valve one; 3. Directional valve two; 4. Hydraulic motor one; 5. Hydraulic motor two; 6. Directional valve three; 7. Oil pump; 8. Steering shaft; 9. Steering wheel; 10. Drive wheel; 11. Oil pipe one; 12. Oil pipe two; 13. Connecting shaft. Detailed Implementation

[0024] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0025] See Figures 1-10 A tracked vehicle steering system includes a steering gear 1 mounted on a chassis, and a reversing valve 2 and a reversing valve 3 connected to both ends of the steering gear 1, a hydraulic motor 4 connected to the reversing valve 2, and a hydraulic motor 5 connected to the reversing valve 3. A reversing valve 6 is mounted on the chassis and is connected to the reversing valve 2 and the reversing valve 3. An oil pump 7 is connected to the reversing valve 6. The steering gear 1 is connected to a steering wheel 9 via a steering shaft 8. The output ends of the hydraulic motors 4 and 5 are respectively connected to drive wheels 10.

[0026] The reversing valve 36 is a three-position four-way reversing valve. The working port A of the reversing valve 36 is connected to the inlet port P of the reversing valve 12 and the reversing valve 23 respectively through the oil pipe 11. The working port B of the reversing valve 36 is connected to the return port T of the reversing valve 12 and the reversing valve 23 respectively through the oil pipe 12. The inlet port P and the return port T of the reversing valve 36 are connected to the oil pump 7 respectively.

[0027] Working ports A and B in directional valve 12 are connected to working ports A and B in hydraulic motor 14, respectively. Working ports A and B in directional valve 23 are connected to working ports A and B in hydraulic motor 25, respectively.

[0028] Directional control valve 1 (2) is a three-position four-way directional control valve with the same passage in both the middle and right positions. Directional control valve 2 (3) is a three-position four-way directional control valve with the same passage in both the middle and left positions.

[0029] The two ends of the steering gear 1 are respectively rotatably equipped with connecting shafts 13, and the valve stems of the first reversing valve 2 and the second reversing valve 3 are respectively connected to the side of the connecting shafts 13.

[0030] The specific working process of this utility model:

[0031] In use, first, move the valve stem of directional valve 6 forward so that the oil inlet P of directional valve 6 is connected to the working oil port A, and the oil return port T is connected to the working oil port B. When the steering wheel 9 is in the middle position, hydraulic oil is pumped into the oil inlet P of directional valve 2 and directional valve 3 through oil pipe 11. At this time, the connection state of directional valve 2 and directional valve 3 is in the middle position mode. Figure 3 As shown, at this time, reversing valve 2 and reversing valve 3 supply oil to the working ports A of hydraulic motor 4 and hydraulic motor 5 respectively through working port A, and return oil through working port B. At this time, the drive shafts of hydraulic motor 4 and hydraulic motor 5 are both in the direction of vehicle travel, causing the two drive wheels 10 to rotate forward in the same direction. When the tracked vehicle needs to turn left, see... Figure 4By operating the steering wheel 9 counterclockwise, the steering gear is driven to move at both ends via the steering shaft 8. This causes the two ends of the steering gear to move the valve stems of directional valve 2 and directional valve 3 respectively via the connecting shaft 13. This causes directional valve 2 to enter the left position mode, at which point its inlet port P switches to be connected to the working port B. Directional valve 3 also enters the left position mode, but its inlet port P remains connected to the working port A. Hydraulic oil enters through the working port B of hydraulic motor 4 and flows through the working port B of hydraulic motor 5. When oil enters through port A, the two drive wheels 10 rotate in opposite directions, causing the tracked vehicle to move to the left. Similarly, when the steering wheel 9 is operated clockwise, the reversing valve 2 enters the right position mode. At this time, the oil inlet P of the reversing valve 3 is still connected to the working oil port A, and the reversing valve 3 also enters the left position mode. At this time, the oil inlet P of the reversing valve 3 switches to be connected to the working oil port B. Hydraulic oil enters through the working oil port A of the hydraulic motor 4 and through the working oil port B of the hydraulic motor 5, causing the tracked vehicle to move to the right.

[0032] When the tracked vehicle needs to stop, the valve stem of the reversing valve 36 is swung to bring the reversing valve 36 to the neutral position, the hydraulic oil supply stops, and the vehicle stops running. When the vehicle needs to reverse, the valve stem of the reversing valve 36 is pulled backward, thereby driving the two drive wheels 10 to rotate backward in the same direction through the hydraulic motor 14 and the hydraulic motor 25.

[0033] By operating the reversing valve 36, the hydraulic motors 4 and 5 rotate synchronously, thereby driving the tracked vehicle to move forward, stop, or move backward. The movement of the two drive wheels 10 of the tracked vehicle is highly consistent and precise. By rotating the steering gear 1, the oil ports of the reversing valves 2 and 3 are connected, thereby controlling the rotation direction of the drive shafts in the hydraulic motors 4 and 5. This results in the two drive wheels 10 rotating in opposite directions, thus enabling the tracked vehicle to move and turn. The tracked vehicle's steering is simple and convenient, with a smaller turning radius and higher steering efficiency.

[0034] The steering gear 1 directly drives the valve stems of the first directional valve 2 and the second directional valve 3 to swing left and right through the connecting shaft 13, thereby realizing the connection state of the oil ports in the first directional valve 2 and the second directional valve 3. The state of the hydraulic oil input to the first directional valve 2 and the second directional valve 3 is directly adjusted by the valve stem of the third directional valve 6. The reversing operation of the tracked vehicle is simple, reliable, convenient and quick.

[0035] In the context of working port A, working port B, inlet port P, and return port T, A, B, P, and T are abbreviations of common terms for existing directional valves that are understandable to those skilled in the art, and will not be elaborated further here.

[0036] The technical features of this utility model not described can be implemented by or by using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this utility model, and this utility model is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model should also be within the protection scope of this utility model.

Claims

1. A steering system for a tracked vehicle, comprising a steering gear (1) mounted on a chassis, characterized in that, It also includes a reversing valve one (2) and a reversing valve two (3) connected to both ends of the steering gear (1), a hydraulic motor one (4) connected to the reversing valve one (2), and a hydraulic motor two (5) connected to the reversing valve two (3). A reversing valve three (6) is provided on the frame. The reversing valve three (6) is connected to the reversing valve one (2) and the reversing valve two (3) respectively. An oil pump (7) is connected to the reversing valve three (6). The steering gear (1) is connected to a steering wheel (9) through a steering shaft (8). The output ends of the hydraulic motor one (4) and the hydraulic motor two (5) are respectively connected to drive wheels (10).

2. The tracked vehicle steering system according to claim 1, characterized in that, The reversing valve three (6) is a three-position four-way reversing valve. The working port A of the reversing valve three (6) is connected to the inlet port P of the reversing valve one (2) and the reversing valve two (3) through the oil pipe one (11). The working port B of the reversing valve three (6) is connected to the return port T of the reversing valve one (2) and the reversing valve two (3) through the oil pipe two (12). The inlet port P and the return port T of the reversing valve three (6) are connected to the oil pump (7).

3. The tracked vehicle steering system according to claim 2, characterized in that, The working ports A and B of the first reversing valve (2) are respectively connected to the working ports A and B of the first hydraulic motor (4), and the working ports A and B of the second reversing valve (3) are respectively connected to the working ports A and B of the second hydraulic motor (5).

4. The tracked vehicle steering system according to claim 3, characterized in that, The first reversing valve (2) is a three-position four-way reversing valve with the same middle and right position mode passages, and the second reversing valve (3) is a three-position four-way reversing valve with the same middle and left position mode passages.

5. The tracked vehicle steering system according to claim 4, characterized in that, The steering gear (1) has a connecting shaft (13) rotatably installed at both ends, and the valve stems of the first reversing valve (2) and the second reversing valve (3) are respectively connected to the side of the connecting shaft (13).

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