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Because the export torque of engine is small and its rev is fast,it only can enhance the torque of engine to ensure
the good working condition of motorcycle by 3-time deceleration.The first time is through the drive and driven gear of
cluth.The second time is through the drive and driven bearing of derailleur.The third time is through the drive and driven
gear of rear transmission device,so that the export power and rev of engine can economically and properly be used.
1 The Structure and Working Principle of Rear Transmission Device
The rear transmission device of this motorcycle adopts
chain.It mainly consists of drive gear,driven gear,drive chain,
chain tie-in,drive chain box,chain adjuster and rubber dead
block.
First,it exports power through the end of countershaft
of engine derailleur(power-exporting bearing),then trans-
fers the power to driven chain through drive chain and
makes 3-time deceleration.The driven chain is fastened
on the cushion body by bolts.The cushion body con-
nects with rear hub through rubber dead block.So when
changing the speed during running,power is transferred
flexibly through rubber cushion,so it avoids the abrasion
of parts and enhances the comfort and stability of
motorcycle.
2 Disassembly and Maintenance of Rear Transmission Device
[1]Dismantle the fixed bolt of gearshift pedal and remove
the gearshift pedal.
[2]Dismantle bolts of left rear cover of left crankcaseand
remove left rear cover of left crankcase.
20
Section 4 Rear Transmission Device
g e a r s h i f t a x l e
re ar co ve r of
left crankcase
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