Bulldozers are a kind of main machinery for earthmoving machinery. They are divided into two types, namely, crawler type and tyre type according to their walking mode. This paper mainly describes the structure and working principle of crawler bulldozer. The basic operation of bulldozer excavation is: A. shovel soil B. soil C. unloading.
Most of the crawler bulldozers with power greater than 120KW use hydraulic mechanical transmission. This type of bulldozer comes from the three basic bulldozers manufacturing technology of D155, D85 and D65 imported from Komatsu. After the localization, the TY320 bulldozers are type TY220, TY160 and basic bulldozers. In order to meet the needs of various users, the bulldozer manufacturers in China have expanded the product variety on the basis of the above three basic bulldozers and formed three series of bulldozers. TY220 type bulldozer series include TSY220 type wetland bulldozer, TMY220 type desert bulldozer, TYG220 type high altitude bulldozer, TY220F type forest bulldozer, TSY220H type sanitation bulldozer and DG45 type pipe machine. TY320 and TY160 series bulldozers are also developing similar products. In the TY160 series, there are TSY160L super wet bulldozers and TBY160 push and pull machines.
The development and development of the bulldozer production variety should not only meet the work adaptability of different working conditions, but also keep the maximum general purpose (or interchangeability) to the maximum of the basic type, which brings great convenience to the use of maintenance for the vast number of users. In order to facilitate the purchase of accessories for the users, the manufacturer has retained the parts number of the Japanese Komatsu company. Only the parts and components that are designed in the modified form are numbered by their own manufacturers.
The crawler bulldozer is mainly composed of engine, transmission system, working device, electrical part, cab and hood. Among them, the mechanical and hydraulic transmission systems include hydraulic torque converter, coupling assembly, planetary gear type power shift transmission, central transmission, steering clutch and steering brake, final drive and walking system.
The power output mechanism drives the working pump in the hydraulic system of the working device, the variable torque variable torque hydraulic system variable speed pump, the steering brake hydraulic system steering pump, and the sprocket wheel represents the final transmission mechanism of the two stage straight gear transmission (including the left and the right final drive assemblies); the crawler board includes the track assembly and the platform frame. A system of walking with the assembly of a suspension device.