| 摘要 |
PURPOSE: An air brake circuit for a tractor is provided to prevent the loss of unnecessary driving force and to secure stable operating conditions by smoothing the working of an ABS(Anti-lock Brake System) and an ASR(Anti Slip Regulation) at a 6X2 tractor. CONSTITUTION: An air brake circuit of a 6X2 tractor towing a large trailer is composed of a PCV(Pressure Control Valve,7) controlling the pressure of air supplied to first and second rear wheels, and a selective isolation device supplying the pressure of air transferred to a non-driving wheel between first and second rear wheels in braking and in the working of an ABS and intercepting the pressure of air in the working of an ASR. The selective isolation device comprises a controller(1) worked by information of a vehicle speed sensor, an ASR solenoid valve(9) controlled by the controller, a dual brake valve(11) worked by the brake pedal operations of drivers, a dual check relay valve(13) supplying air from an air tank(17) to the PCV by greater pressure between air from the dual brake valve and air from the ASR solenoid valve, and a relay valve(15) operated by air from the dual brake valve and switching the state of supplying air passing through the PCV to air chambers(3,5) arranged at the non-driving wheel of rear wheels.
|
