Komatsu Galeo PC800-8 Shop Manual page 158

SEN00383-03
1. Hydraulic motor unit
Function
• This hydraulic motor is called a swash plate type
axial piston motor. It converts the energy of the
pressurized oil sent from the hydraulic pump into
rotary motion.
Principle of operation
• The oil sent from the hydraulic pump flows
through valve plate (7) into cylinder block (5).
This oil can flow on supply side of the Y-Y line
connecting the top dead center and bottom dead
center of the stroke of piston (4).
• The oil sent to supply side of cylinder block (5)
presses pistons (4) (4 or 5 pieces) and generates
force F1(F1 kg = P kg/cm
• This force is applied to thrust plate (2).
• Since thrust plate (2) is fixed to the angle of (a)
degrees to output shaft (1), the force is divided
into components F2 and F3.
• The radial component F3 generates torque
against the Y-Y line connecting the top dead
center and bottom dead center (T = F3 x ri).
• The resultant of this torque [T =
tates cylinder block (5) through the piston.
• Since cylinder block (5) is coupled with the out-
put shaft by means of spline, the output shaft re-
volves to transmit the torque.
36
x x/4D2 cm
).
2 2
( F3 x ri)] ro-
10 Structure, function and maintenance standard
PC800, 850-8