Farm Tractor 140hp With 4 And 6 Cylinders

A frameless tractor uses the engine and transmission housings as its base, mounting the running gear, control system, covers, and cab. Because it lacks a frame, the tractor is lightweight; however, each housing is a load-bearing component, so its strength and rigidity must be carefully considered during design.

A semi-rigid frame tractor consists of two longitudinal beams and one crossbeam. The rear ends of the longitudinal beams connect to the transmission housing. The engine and clutch are mounted on the upper part of the frame, while the lower part is connected to a transverse leaf spring or rubber block via a pivot pin in the middle of the crossbeam. This structure is generally used in tractors with semi-rigid running gear.

To steer a tractor, a steering torque in the same direction as the turn must be applied to overcome the steering resistance torque during turning. There are several ways to apply steering torque: 1. Deflecting the wheels; 2. Deflecting the frame; 3. Applying unequal driving forces to the two wheels; 4. A combination of methods.

Left and right front wheel steering: Most tractors have a rear-mounted or suspended implement, and are guided by the front wheels and driven by the rear wheels. The steering torque is generated by the lateral force of the ground on the guide wheels.

The front and rear frames of the tractor are hinged and can rotate relative to each other in the horizontal plane to achieve steering. Some frames can also swing relative to each other around a rocker pin, ensuring good contact between the wheels and uneven ground.