汽车构造重点Keyautomotiveconstruction.doc

汽车构造重点(Key automotive construction)
Automobile structure are summarized
The same point 1, four stroke diesel engine anrent ways of ignition, resulting in diesel engine needs a higher compression ratio.
What is the role of the 4 engine, forced circulation water cooling, and the circulating water.
Answer: role: to improve the coolant pressure by pump, forced circulating cooling fluid in the engine.
Circulating water: water pump, water pipes and water body
Up / down
Through the radiator thermostat through the cylinder head jacket
5, the engine temperature is too high or too low, what harm?
Answer: (1) : high temperature metamorphic lubricating oil, the oil film parts can't keep normal: (2) heating parts
The expansion is too large and the destruction of normal clearance: (3) to the mechanical properties of metal materials decreased, so that can not afford
The normal load.
Low: (1) fuel evaporation, combustion quality deterioration;
(2) the oil viscosity increases, the friction loss and
;(3) increase the corrosion wear of the cylinder.
These adverse consequences will lead to reduction of engine power, economic deterioration, loss of life.
the composition of overhead type gas distribution mechanism, how it works?
Composition: the valve group comprises a valve, valve guide, valve main spring, valve spring retainer, valve
The transmission group comprises a rocker shaft and rocker arm, push rod, camshaft, tappet, timing gear.
When working, the crankshaft drives the camshaft rotating through the timing gears, cam projections from the top of the tappet, through
The push rod rocker swing, compress the valve spring, the valve from the seat (or valve opening), cam projections from
After opening, the valve closed by spring force.
the ignition advance angle on engine performance impact, how to realize its adjustment.
When the valve opening, speed increased, w increased, ignition angle, or continue to work for
Process, the dynamics of economic decline. A cert