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Section 2 General Construction
The motorcycle is mainly composed of running system, steering and braking system, transmission
system, oil supply system, electrical system and engine, and other portions, as shown in Figure 1-3.
Figure 1-3 General Construction Chart of a Complete Motorcycle
[1] Running system
[2] Steering and braking system
[3] Transmission system
[4] Oil supply system
[5] Electrical system
[6] Engine
1. Running System
Basic functions of the running system include:
[1.]To make the motorcycle as a whole, and support the whole mass;
[2.]To accept the output torque from driveline, and to produce the traction to drive the motorcycle
through the adhesive action between drive wheels and road surface;
[3.]To bear and pass various external forces and the resulting torque effected by road surface on
wheels;
[4.]To absorb or mitigate the impact and vibration of the running motorcycle. The running system
mainly consists of main frame assembly, front and rear dampers and front and rear wheels and other
accessories.
2. Steering and braking system
The steering and braking system mainly functions to exert direct control on running direction, driving
running speed, braking, lighting and signals, etc., to ensure the safe driving of the motorcycle.
The steering and braking system consists mainly of steering devices, brake devices, and accessories
such as operating handle, control switch and mechanic
’
s wire connected to some devices.
3. Transmission System
Based on road conditions and driving needs, the transmission system transmits the torque increased or
rotated speed reduced by a certain ratio to drive wheels, so as to drive the motorcycle.
The transmission system consists mainly of a starter, clutch, gearshift and rear transmission device and
other accessories.
[1.]Starter
A motorcycle start device activates the motionless engine and enables it in operation. Motorcycle start
devices can be divided into treadle-type starter and electric starter.
[2.]Clutch
The clutch ensures reliable, gentle transmission or cut-off of output power from the engine, thus
the motorcycle can start running and shift gears in a balanced way. The clutch ensures reliable, gentle
transmission or cut-off of output power from the engine, thus the motorcycle can start running and shift
gears in a balanced way. The model adopts an automatic wet-type multi-plate clutch.
