JLG 600SC_660SJC Service Manual - Manual (Page 105)

SECTION 5 - CAT CHASSIS (S/N 0300128000 TO PRESENT)
3121157 – JLG Lift – 5-13
Reduction Gears
Reduction gears consist of a double stage planetary pin-
ion gear system.
Drive gear (1) is engaged with the primary planetary gear
(2), secondary sun gear (4) with secondary planetary gear
(5). Secondary planetary carrier (6) is fixed to the machine
body. Planetary gears (2) and (5) are engaged with ring
gear (7) (housing).
Driving force of 1st stage is transferred from piston motor
to drive gear (1) with the speed reduced by each gear.
The final driving force is transferred from 1st stage one to
ring gear (7) through planetary gear (5) of planetary car-
rier (6) fixed on the machine body. (Driving force is also
transferred from primary planetary gear {2}.) Direction of
input rotation and that of output rotation are reverse.
Reduction gear ratio "i" is shown as follows by primary and
secondary reduction gear ratios "i1" and "i2".
z1: number of drive gear tooth
z3: number of ring gear tooth
z4: number of sun gear tooth
z6: number of ring gear tooth
TM : input torque (motor output torque)
i : reduction gear ratio
h
m
: mechanical efficiency
NM: input speed of rotation (output motor speed)
Figure 5-16. Structure of Reduction Gear
(1)
(5)
(2)
(6)
(4)
(7)
* Reduction Gear Ratio (i)
i i i
Z Z
Z
Z Z
Z
= Ч - =
+
Ч
+
-
1 2 1
1 3
1
4 6
4
1
* Reduction Gear Output Torque (T)
T TM i
m
= Ч Ч
* Reduction Gear Output Rotating Speed (N)
N
NM
i
=