Hyundai HX130LCR Manual page 97

2. PRINCIPLE OF DRIVING
※ Descriptions are based on the type 1 of the swing motor.
1) GENERATING THE TURNING FORCE
The high hydraulic supplied from a hydraulic pump flows into a cylinder block (8) through valve casing
(22) of motor and valve plate (20).
The high hydraulic is built as flowing on one side of Y-Y line connected by the upper and lower sides of
piston (12).
The high hydraulic can generate the force, F1=P×A (P : supplied pressure, A : fluid pressure area),
like following pictures, working on a piston.
This force, F1, is divided as N1 thrust partial pressure and W1 radial partial pressure, in case of the
plate of a tilt angle, α.
W1 generates torque, T=W1+R1, for Y-Y line connected by the upper and lower sides of the piston as
following pictures.
The sum of torque (ΣW1×R1), generated from each piston (4~5 pieces) on the side of a high
hydraulic, generates the turning force.
This torque transfers the turning force to a cylinder (8) through a piston; because a cylinder is
combined with a turning axis and spline, a turning axis rotates and a turning force is sent.
Y
Pistion
W1
Cylinder
W1
R1
N1
O
A
f1 F1
P
Y
High Low
pressure pressure
140WF8TM05
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