Reasons for the use of the main reducer 1 In the driving work, improper operation such as starting, shifting, and sudden braking causes the drive train to be subjected to severe impact. This severe impact load is particularly likely to cause the driven gear and the differential case to be coupled with the bolt. The looseness was even cut. 2 After the flameout slides, the engine is forced to start the gear, and the drive train is subjected to a large impact load. 3 overloaded driving.
Preventive measures Through the analysis of the above reasons, we believe that the use and maintenance department of all Dongfeng EQ140 vehicles should take the following measures for the characteristics of the single-stage hyperbolic gear transmission of the main reducer of this model: strengthen the training and strengthen the driver and maintenance workers. Training to understand the structural principles and technical characteristics of the model for proper driving and maintenance.
Maintenance according to the specified technical requirements 1 Maintenance according to the specified mileage, no de-protection, no leakage protection. 2 Check the cause of the oil seal and mat oil leakage in time, and replace it, add the hyperbolic gear oil of the specified grade as needed. 3 Replace the hyperbolic gear oil on time. 4 The first secondary maintenance after overhaul, 3D maintenance or replacement of the final drive should be done: thoroughly clean the oil storage parts of the final drive, the differential and the rear axle housing, and change the oil after drying; The vent hole of the shell and the oil return hole of the driving bevel gear bearing housing; fasten the driven bevel gear and the differential case coupling bolt, the differential coupling bolt, and pay attention to the integrity of the locking piece.
The piston is one of the main moving parts of the
engine, is composed of combustion chamber components.
The pressure of the gas
piston through the connecting rod to the crankshaft, realize the change from
heat energy to mechanical energy.
The work condition is very bad, and the
temperature of 1400-1800 DEG C, and pressure
Up to 13MPa above the gas
contact, greatly alternating thermal stress and mechanical stress.
And by the
serious corrosion of gas, and under the condition of boundary lubrication and
cylinder wall friction and strong impact 1 times.
The piston in high
temperature, high pressure, strong corrosive gas contact so that it has enough
strength and hardness,
Heat resistance and good thermal resistance, high
fatigue strength and corrosion resistance. For high speed Diesel Engine Piston
also requires light as far as possible.
In order to reduce the inertia
force.
Marine piston large low speed diesel engine of the crosshead is
usually combined.
The heat treatment process by normalizing and annealing,
and iron pearlite are ferrite organization, has good heat resistance.
Piston
alloy quenched and tempered steel has better heat resistance and corrosion
resistance. The skirt with nodular cast iron annealing treatment, with good wear
resistance.
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