How many parts does a bulldozer consist of?

Bulldozer consists of four parts, namely, hydraulic torque converter, transmission, steering clutch and steering brake.

Hydraulic torque converter: Hydraulic torque converter works by hydraulic pressure. When the oil flows in the cascade, it will consume energy due to impact and friction, which will make the oil heat up, so the transmission efficiency of the hydraulic torque converter is low. The best hydraulic torque converter at home and abroad, the highest efficiency can reach 88%.

When the turbine of the torque converter stops rotating due to the overload of the bulldozer, all the energy transmitted by the pump wheel is converted into heat and consumed, and the efficiency of the torque converter is zero. In order to improve the transmission efficiency of torque converter, it is necessary to master the load of bulldozer, so that the turbine has a suitable speed and the bulldozer also has a suitable speed; That is, when the bulldozer can't walk because of the heavy load, it is necessary to reduce the load, lift the bucket or shift from second gear to first gear in time.

Transmission: planetary gear power shift transmission, mainly composed of four planetary gears and a rotary locking clutch. If the ring gear is fixed with a clutch, when sun gear turns right, the planet wheel turns left, the planet wheel turns right and the planet carrier turns left, thus forming a planetary gear reduction mechanism with sun gear input and planet carrier rotating in the opposite direction. TY220 bulldozer gearbox uses the second planetary gear as reverse gear.

Steering clutch and steering brake: When the bulldozer needs to steer, the hydraulic oil fills the oil cavity between the steering clutch piston and the hub, and the oil pressure pushes the piston to drive the pressure plate to move to the left, and the friction plate and toothed plate are loosened, so that the torque is no longer transmitted. The bulldozer lost power on the left side and turned to the left under the push of the right crawler. At the end of steering, loosen the pull rod, the hydraulic oil flows back under the push of the piston, the steering clutch is re-engaged to transmit force, and the bulldozer resumes straight running.

Extended data

Fault analysis of bulldozer;

Bulldozer can't start: the starter works normally, and it is preliminarily judged that the fault is in the oil circuit. When pumping oil with a manual pump, the amount of oil pumped is sufficient, and there is no air in the oil flow, so the manual pump can also work quickly. Explain that the oil supply is normal, the oil circuit is not blocked, and there is no air leakage. The fault lies in the solenoid valve. After replacing the solenoid valve, the engine works normally and the fault is eliminated.

Bulldozer is difficult to start: when pumping oil with manual pump, the amount of oil pumped out is not large, but there is no air in the oil flow. When the manual pump works quickly, the vacuum generated is very large, and the piston of the oil pump will be automatically sucked back. Because the oil circuit is blocked by impurities, it is judged that there is no air leakage in the oil circuit. The rubber layer on the inner wall of the hose falls off or falls off, which blocks the oil circuit. Because the machine is not used for a long time, the possibility of aging is small, so it is temporarily ruled out.

Refer to Baidu Encyclopedia-Bulldozer