Oil Motor Side Swash Plate And Transmission Ratio - Honda NSA700A DN-1 2009 Service Manual

TECHNICAL FEATURE

OIL MOTOR SIDE SWASH PLATE AND TRANSMISSION RATIO

One of the functions of the oil m otor is to change the transmission ratio by controlling the tilt angle of the motor side
swash plate, which changes the amount o f the oil supplied to the oil motor. The amount of the oil supplied to the motor
side swash plate determines the difference of the revolution speed between the pump side swash plate and cylinder. When
the difference between the two speeds is at the maximum, the transmission is in the lowest ratio. When the speed differ­
ence is at the m inim um , the transmission is in the highest ratio.
• Low ratio:
When the tilt angle of the m otor side swash plate is
great, large amount of the oil is required to match the
motor piston stroke.
To move the pump piston rapidly, the difference of the
revolution speed between the pump side swash plate
and cylinder (integrated with the output shaft) is at the
maximum. Therefore the transmission ratio is lowest
when the tilt angle of the m otor side swash plate is at
the maximum.
• Middle ratio:
As the tilt angle becomes smaller, the amount of oil
required for piston stroke is reduced as well. The dif­
ference of the revolution speeds decreases as the rev­
olution speed of
continuously.
• Top ratio:
When the m otor side swash plate is not tilted, the
m otor pistons do not stroke and no oil is reeded.
The revolution speed of the pump side swash plate
and cylinder (output shaft) is the same (transmission
ratio is 1:1, theoretically).
2-12
the output shaft increases