When the car is driving in a low temperature environment, the wear of the various assemblies, especially the engine, is relatively serious. During engine use, more than 50% of cylinder wear is caused during start-up and initial engine operation. In winter, it starts at low temperature and accounts for 60%-70% of its wear. The main reasons for the serious wear of the engine caused by starting the engine at low temperature are: First, the electronic anti-theft of the engine, when the temperature is low, the viscosity of the lubricating oil is large, and the fluidity is poor. The oil pump can not press the lubricating oil into the friction surface of each moving part in time. The lubrication of the cylinder wall, main bearing and connecting rod bearing deteriorates. Second, the fuel gasification is poor, part of the fuel enters the cylinder in a liquid state, flushes the lubricating oil film on the cylinder wall and flows into the crankcase, diluting the lubricating oil, making the lubricating oil oily and reducing its lubricating performance. Third, due to the low temperature, the water vapor precipitated during the operation of the engine condenses on the cylinder wall and generates acid with the sulfur-containing oxide in the gasoline, causing corrosion and wear. Therefore, the gasoline used under low temperature conditions should have a sulfur content of not more than 0.1%. Fourth, at low temperatures, the expansion coefficients of the alloy, the bearing bush and the journal of the crankshaft and the connecting rod bearing are different, so that the matching clearance becomes smaller, and the gap becomes uneven, resulting in increased wear. Fifth, the lubricating oil of the transmission system of the transmission, the final drive and the differential is excessively viscous or even solidified at low temperatures, which deteriorates the lubricating ability and even loses the lubricating ability. If the frictional heat generated by the operation of the power train is used to heat the lubricating oil, the temperature rise time is long, and the mechanical parts are in a dry friction or a semi-dry friction state, so that the parts are sharply worn. For example, when the temperature of the CA1091 automobile powertrain lubricating oil is -10 °C, it can only rise to 10 °C-15 °C after 6 km of driving. At this time, the gears and bearings are still not well lubricated. According to the information provided by the relevant technical departments, the engine electronic anti-theft device, the drive train gears and bearings operate in the lubricating oil at -5 ° C than in the lubricating oil at 35 ° C, and the wear amount is increased by 10-12 times. China Hardware Business Network
Vibration Testing Equipment,Laboratory Test Equipment,Laboratory Test Shanker,Diameter 300Mm Test Equipment
Xinxiang Xin Ming De Machinery Co., Ltd. , http://www.xmdsieve.com