Crawler type is different from wheeled tractor, it is supported on the ground by a coiled endless crawler. A wheeled tractor is a type of tractor. That is, the running device is a tractor with wheels. (Different from crawler tractors) There are two-wheel (walking tractor), four-wheel and other types. Divided into rear-wheel drive and four-wheel drive. The high-horsepower wheeled tractor has good traction performance and is suitable for high-speed operation with wide-width agricultural tools on large farms. The crawler tracks touch the ground, the thorns are inserted into the soil, and the driver is not grounded. Under the action of the driving torque, the driving wheel continuously rolls up the track from the rear through the engagement between the gear teeth on the driving wheel and the pin of the track shoe. The grounded part of the crawler exerts a backward force on the ground, and accordingly a forward reaction force Pk needs to be given to the crawler, and this Pk reaction is the driving force that pushes the tractor forward.
The driving force of the wheeled tractor is directly transmitted to the walking wheel, while the crawler tractor is different. Its driving force Pk is transmitted to the axle of the driving wheel through the track wound on the driving wheel, and then the axle is transmitted through the body of the tractor. onto the drive wheel. When the driving force is sufficient to overcome the rolling resistance and the traction resistance of the implement, the rollers roll forward on the upper surface of the crawler, so that the tractor travels forward. Since the drive wheel continuously rolls the track to the front one by one, and then spreads it on the ground through the guide wheel, the roller can continuously roll on the track laid with the track.
It can be seen that the crawler tractor is driven by the interaction between the crawler and the ground through the driving torque through the driving wheel, and the driving force is greater than the sum of the rolling resistance and the traction resistance. The maximum driving force is the same as that of a wheeled tractor, which depends on the capability of the internal combustion engine on the one hand, and is limited by the adhesion conditions between the track and the ground on the other hand. Generally speaking, the greater the power of the tractor, the greater the driving force. There are many factors that affect the adhesion. As far as the structure of the tractor itself is concerned, reasonable selection of the shape and size of the crawler and crawler, and increasing the bearing weight of the crawler within a certain limit can improve the adhesion and increase the traction of the tractor.
