1. Main characteristics of WD615 series diesel engines
1.1 High reliability The WD615 series diesel engine adopts a tunnel type structure, with a crankshaft box and seven main bearing caps cast into one. The overall forged nitrided crankshaft and high-quality alloy steel connecting rod, as well as strong bolts manufactured with flexible design and strict tolerance fit, all ensure the high reliability of various moving parts of the diesel engine; Design a reasonable high power function camshaft profile to ensure higher reliability and lower mechanical vibration noise in the diesel engine valve system. The use characteristics of construction machinery shall be fully considered, and sufficient Factor of safety and reliability factor shall be reserved for each system configuration and parts design. According to calculations, laboratory and market inspections, the average overhaul period of diesel engines can reach over 10000 hours. 1.2 Good power performance and large torque reserve This series of diesel engines adopts a Bosch P-type high-pressure oil pump, a full range bipolar governor, and a low inertia porous injector. Through fuel supply characteristic correction and reasonable matching of an efficient turbocharger, the power performance is good, and the torque reserve can reach over 30%, which can meet the power and torque requirements of various engineering machinery. 1.3 Good economy, low fuel and oil consumption The new structure of the piston ring, optimal cylinder clearance, new combustion chamber and optimal swirl ratio configuration, optimized fuel system and intake and exhaust system, dry cylinder liner, platform honing mesh, avoids water and air leakage, ensures a more perfect cylinder hole geometry, and enables the diesel engine to have lower fuel and oil consumption rates over a wide range of power and speed. At present, the minimum fuel consumption rate of intercooler models can reach 195g/kW. h, and the oil consumption rate is below 0.5g/kW. h. 1.5 Low emissions, low pollution, and low noise The use of a shallow combustion chamber and high piston rings, low vortex flow passages, high injection pressure fuel system, and porous micro diameter fuel injectors greatly improves Combustion process. The emissions can reach European standards, with some models meeting Euro II emission standards. 1.6 Good low-temperature starting performance Without the help of a low-temperature starting device, it can start smoothly at -10 ℃, while using a low-temperature starting device can start smoothly at -40 ℃. 1.7 Reasonable structure and convenient operation and maintenance Single body cylinder head, small size, good craftsmanship, and strong interchangeability. The main sealing parts adopt no gasket technology, which completely solves the "three leaks" problem in the diesel engine.
