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What are the steering methods and characteristics of tracked vehicles

update:02-09-2020
abstract:

The steering performance of tracked vehicles is one of […]

The steering performance of tracked vehicles is one of the important evaluation criteria in its comprehensive performance indicators. There are many ways to turn tracked vehicles. There are generally three steering methods for common tracked vehicles:
 
When the crawler transport vehicle slips and steers, the thrust of the outer crawler is increased and the thrust of the inner crawler is reduced, so that the vehicle obtains a steering torque. Under the action of this moment, the crawler transport vehicles can overcome the steering resistance moment when turning, and the steering resistance moment is mainly generated due to the slippage of the crawler belt and the turning inertia of the vehicle. Sometimes, because the steering resistance torque of the tracked vehicle is relatively large when turning, the power that the tracked transport vehicle needs to consume during the steering process is obviously more than that of the straight line. In addition, it is usually necessary to brake the inner track during the steering process, which will cause the large composite forward thrust of the tracked transport vehicle to become smaller, and often stop when the terrain conditions are not good.

During the turning process of the vehicle, the crawler transport vehicle can form a curved shape on the ground by adjusting the flexible crawler mechanism on the side. The supporting wheel is installed on a shaft at a proper angle to the vertical line in the longitudinal plane of the vehicle body, and the lower part of the supporting wheel is displaced under the movement of the shaft to form a curved track. Compared with slip steering, this steering mode consumes less power during steering. However, due to the limitation of the flexibility of the flexible track itself, a large turning radius is required during the turning process. If this kind of steering mechanism is added with other steering mechanisms, the problem of excessive turning radius can be overcome, which will inevitably cause the structure of the vehicle to become very complicated and consume more power.

Articulated steering is generally used in vehicles with two or more bodywork. Due to the articulated mechanism, when the vehicle is turning, the relative rotation between the vehicle bodies can be realized, so that the vehicle can drive according to a given curved path. In addition, the articulation mechanism can also meet the needs of the vehicle body to achieve pitch and roll within a certain range. Compared with sliding steering, articulated steering requires much less power during the steering process. With articulated steering, the combined forward thrust of the vehicle will not change, but the large combined forward thrust of the vehicle will be reduced when the vehicle is turned in the slip steering mode. Therefore, the use of articulated steering can make the vehicle obtain better maneuvering steering performance.
Compared with other crawler transport vehicles, the steering process of the double-section crawler transporter is to control the movement of the piston rod of the hydraulic cylinder through the hydraulic system to steer. The articulated steering mechanism is used to improve the stability of the walking process, but the main purpose is to improve the crawler transport The steering ability of the vehicle. Compared with traditional crawler transport vehicles, articulated crawler vehicles have the characteristics of good ride comfort, strong maneuverability, and higher stability during steering.