Branson F36r - Hst Pump; Hst Motor

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CHAPTER 6 HYDRAULIC SYSTEM 3015R(h)/3515R(h)/4015R(h)/F36R(h)/F42R(h) TRACTOR
4.10.4 HST PUMP
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(1) Piston
(2) Shaft
(3) Swash plate
The pump in the HST is equipped with several pistons (1)
tocontrolhydraulicowwithreciprocatingmotion.Also,
it uses its swash plate (3) to hydraulic flow and flow
direction. The piston attached to its cylinder is in contact
with the inclined surface of the swash plate, sliding on
this surface in reciprocating motion in the cylinder.
Therefore, Every time the shaft (2) rotates once, the
pistons reciprocate once as well. The pistons on one
side in the cylinder suck oil while the pistons on the other
side in the cylinder discharge oil, forming one cycle.
Therefore, the cylinder is divided into the high-pressure
side and low-pressure side. When, the inclined side of
the swash plate is changed, these sides are switched.
Thisiswherethedirectionofowchangeswhenthe
HST pedal is depressed the "forward" or "reverse".
Then, the rotating direction of the motor shaft in
the HST is changed to enable forward or reverse
driving.
The inclination of the swash plate in the pump is
adjusted within the range of -18° - +18°, and its angle
determines the driving direction and vehicle speed.
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4.10.5 HST MOTOR
(1) Piston (2) Shaft
The motor in the HST has a shape similar to the
pump,butitisequippedwiththexedswashplate,
makingitaxedcapacitytype.
After hydraulic oil is compressed in the pump, it
is led into the motor to drive it. The piston in the
motor has a structure similar to a pump, but the
swashplateofthemotorisxedattheangleof18°.
Therefore, when each piston receives high-pressure
oil, it is extended to push out the swash plate.
However, as the swash plate is fixed, this force is
blocked by the swash plate and rotates the cylinder
assembly instead.
Therefore, one half of the cylinder space expands
while the other half of the cylinder space contacts.
Oil discharged in this state is returned to the suction
line toward the pump, completing one cycle.
The speed of the motor is determined by the amount
ofoilowofthepump,andtherotatingdirectionof
themotorisdeterminedbythedirectionofoilow.
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