Hyundai R 160 LC-3, Руководство по обслуживанию

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2-57
2. FUNCTION
HYDRAULIC MOTOR
Rotary group
1)
(1)
The cylinder block contains nine pistons. The end face of the cylinder block is in contact with the
valve plate that has two semicircular ports B and C(Distributor valve that changes over high and
low pressures).
Principle of generating torque
If high pressure oil(Pressure P) is admitted to port P,force F(=PXA, A : Cross-sectional area of a
piston) per piston acts on the shaft and generates radial component Ft. As the result, the total
sum of radial forces of the pistons on the high pressure side produces a rotating torque in the
direction of the shaft.
Inversely, if high pressure oil is admitted to port C, the motor turns in the opposite direction.
The output torque and revolution of the motor available by the above-mentioned principle depend
upon pressure(P) and inflow rate(Q) supplied to the motor and are calculated as below:
ň Output torque
T=
P ź D źҊ m
2
ź ॏ ź
100
(kg ň m),
Piston
Valve plate
Shaft
Cylinder block
X
X
N =
Q
ź
1000
ź ѳ
v
D
(rpm),
Where ; D : Displacement capacity(cc/rev)
P : Effective drive pressure(kg/cm 2
Q : Incoming flow( ֻ /min)
ѳ
m
: Mechanical efficiency(%
ź
10 -2 )
ѳ
v
: Volumetric efficiency(% ź 10 -2 )
(1)
(2)