Bulldozer is a main kind of earthwork construction machinery, which can be divided into tracked bulldozer and tire bulldozer according to the way of walking, because there are fewer tire bulldozers. This paper mainly describes the structure and working principle of crawler bulldozer. The basic work of bulldozer excavation is: A. shovel soil B. transport soil C. unload soil.
In crawler bulldozers with power greater than 120KW, most of them adopt hydraulic-mechanical transmission. This kind of bulldozer comes from the introduction of D155, D85 and D65 bulldozer manufacturing technology from Komatsu Production Institute in Japan. After localization, the bulldozers are finalized as TY320, TY220 and TY160 basic bulldozers. In order to meet the needs of users in various working conditions, China's bulldozers manufacturers have expanded their products and formed three series of bulldozers on the basis of the above three basic bulldozers. TY220 bulldozer series products, including TSY220 wetland bulldozer, TMY220 desert bulldozer, TYG220 plateau bulldozer, TY220F forest cutting bulldozer, TSY220H sanitation bulldozer and DG45 hoist, etc. TY320 and TY160 bulldozers are also expanding similar products. TY160 series also includes TSY160L super wetland bulldozer and TBY160 bulldozer.
The development and expansion of bulldozer products not only need to meet the working adaptability of different working conditions, but also need to maintain the maximum commonality (or interchangeability) of components with the basic model, which brings great convenience for users to use and maintain. In order to facilitate users to purchase accessories, the manufacturers have retained the parts number of Komatsu Company in Japan. Only the parts designed by themselves in the modification can be given the number of their own manufacturers.
Tracked bulldozer is mainly composed of engine, transmission system, working device, electrical part, cab and hood. Among them, mechanical and hydraulic transmission system includes hydraulic torque converter, coupling assembly, planetary gear power shift transmission, central transmission, steering clutch and steering brake, final transmission and walking system.
Power output mechanism drives working pump, variable speed torque hydraulic system and steering pump of steering brake hydraulic system in working device hydraulic system by means of gear transmission and spline connection; sprocket represents the final transmission mechanism of two-stage spur gear transmission (including left and right final transmission assembly); Caterpillar board includes walking system including caterpillar assembly, platform frame and suspension assembly.