U20-3, U25-3 WSM Hydraulic system (Mechanism section)
IV-M-53
e. Function of reduction gear
The reducer is composed of a two-step planetary gear mechanism.
Construction view
The drive gear [1] is engaged with the 1st planetary gear [2] and the 2nd sun gear [4] is engaged with the
2nd planetary gear [5]. The 2nd planetary carrier [6] is fixed on the body. The planetary gears [2] and [5]
are engaged with the ring gear [7] (housing).
The driving force from the piston motor is transmitted to the driving gear [1] and its speed is reduced
through the gears. The speed-reduced driving force is transmitted to the ring gear [7] via the planetary
gear [5] of the planetary carrier [6] fixed on the body.
(The driving force is also transmitted via the 1st planetary gear [2].)
The output rotation is reverse to the input rotation.
The reduction ratio (i) is expressed as shown below: where (i1) and (i2) are the 1st-step reduction ratio
and 2nd-step reduction ratio, respectively.
Reduction ratio (i)
i=(i1
×
i21)=(
Z1+Z3
Z1
Z4+Z6
Z4
×
1)
Z1: Number of teeth of drive gear
Z3: Number of teeth of ring gear
Z4: Number of teeth of sun gear
Z6: Number of teeth of ring gear
T
M : Input torque (motor output torque)
i : Reduction ratio
η
m : Mechanical efficiency
N
M: Input revolutions (motor output revolutions)
¤
Reducer output torque (T)
¤
Reducer output revolutions (N)
T=T
M
×
i
× η
m
N=
NM
i
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