2-63
REDUCTION UNIT
The reduction unit consists of double stage planetary gear mechanism.
Z1
Z2
Z3
Z4
Z5
Z6
[3]
[2]
[4]
[5]
[6]
[1]
R35Z72TM19
Drive gear[1] is engaged with the 1st planetary gear [2], 2nd stage sun gear [4] is engaged with
the 2nd planetary gear [5]. The 2nd stage planetary carrier [6] is fixed machine body. Planetary
gears [2], [5] are engaged with ring gear (housing).
The driving force form the piston motor is transmitted to drive gear [1], and the speed is reduced
by each gear.
The reduced driving force is transmitted to ring gear through planetary gear [5] of planetary carrier
[6] fixed on the machine body. (The driving force is also transferred from 1st stage planetary gear
[2]). The direction of output rotation are reversed against that of input rotation.
The reduction gear ratio " i " is shown as follows.
ö
Reduction gear ratio (i)
ö
Output torque of reduction unit (T)
ö
Reduction gear output rotating speed (N)
Z1 : Drive gear teeth number
Z2 : Ring gear teeth number
Z4 : Sun gear teeth number
Z6 : Ring gear teeth number
Z1+Z3 Z4+Z6
I = (i1
Ý
i2-1) = (
Ý
-1 )
Z1 Z4
T = TM
Ý
i
Ýɽ
M
NM
N =
i
TM : Input torque (motor output torque)
i : Reduction gear ratio
ɽ
M : Mechanical efficiency
NM : Input speed of rotation (output motor speed)
7
7
)
