5-10t Internal Combustion Counterbalance Forklift Truck Operation & Maintenance Manual
6.1.2 Operating Principle (Refer to Fig 6-4.)
Fig 6-4. Drawing for Oil Circuit of Steering Unit
The valve core, valve sleeve, and valve body in steering unit form the rotary servo valve, to play the
function for controlling the oil flow direction. The rotor and stator form the cycloid engagement pair,
to play the function for measuring components during power steering, so as to ensure the oil quantity
flowing into the cylinder and the turning angle of the steering wheel to be in direct proportion. It
plays the function of manual oil pump during manual steering. The universal driving shaft plays the
function for transmitting torque.
When it is at the middle position (namely when steering wheel is not turned.), the oil from oil pump
returns to oil pipe through valve core in the open-core system (as in Fig 6-4).
During power steering, the oil from oil pump enters into the cycloidal lantern gear engagement pair,
and pushes the rotor to rotate following the steering wheel, and presses quantitative oil pressure into
the left cavity or the right cavity of cylinder, to drive the steering wheel to achieve power steering,
while the oil of the other cavity will return to oil tank (b and c in Fig 6-4).
To Next Page
Loading...
