Maeda MK0003, Руководство по обслуживанию, Страница: 92 / 348

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7.4 OPERATING PRINCIPLES
Each of the PHK series traveling motor consists of a stationary body composed of a hydraulic motor and hydraulic
valves and the rotary body composed of a simplified planetary reducer.
7.4.1 REDUCER
[1] Functions
The traveling motor reducer consists of a 2-stage simplified planetary gear reducer, which reduces and converts the
high-speed rotational motion from the hydraulic motor into a low-speed, large torque to obtain a case rotation.
[2] Operating principles
In the figure at the right, the hydraulic pressure motor
output shaft is spline-coupled (or integrated with the
shaft) with gear S2, and the rotation of gear S2 is single
stage-reduced between gears (S2, b2 and a2).
The single stage-reduced revolution is double
stage-reduced between the spline-coupled gears (S1,
b1 and a1) with carrier 2, and the revolution is
transmitted to the rotary body section through the inner
a1 and a2 gears to serve as a traveling drive force.
The reduction ratio of a 2-stage simplified planetary gear
reducer is generally expressed as follows:
R =
Zs1
×
Zs2
Zs1 + Za1 Zs2 + Za2
Where, Zs1, Zs2: Teeth number of s1 and s2
Za1, Za2: Teeth number of a1 and a2
Also, since the traveling motor is of a body rotating type,
its reduction ratio is as follows:
R’ =
1
1 - 1/R
Rotating
section
Carrier 2
Simplified planetary gear reducer (2 stages)
Stationary
section