Workshop Manuals Factory service & repair SEAT
SEAT Leon Mk101 · Power transmission
01 · Transmission

Calculation of the gear ratio ?i? (085 5-speed manual gearbox)

Make
SEAT
Model
Leon Mk1
Section
085 5-speed manual gearbox › Technical data › Calculation of the gear ratio ?i?
Power transmissionCalculation of the gear ratio ?i?
Calculation of the gear ratio “i”
The gear ratio is obtained by dividing the number of teeth on the driven gear by the number of teeth on the driving gear.
Example:
   
 5th gearConical gears
Driving gear (primary)47 (Z1 = Primary)15 (Z1 = Sprocket)
Driven gear (secondary)40 (Z2 = Secondary)64 (Z2 = Crown)

i = Z2 : Z1
This way we can find out:
iG = Gear ratio of a gear
iG =
Z2 Secondary
Z1 Primary
=
40
47
= 0,851
iA = Gear ratio of the differential
iA =
Z2 Crown
Z1 Sprocket
=
64
15
= 4,267
itotal = Total gear ratio
Is obtained by multiplying the gear ratios of the longest gear and the conical gears.
itotal = iG x iA = 0,851 x 4,267 = 3,631
   

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