초록 ▼

A work vehicle is provided with a brake system actuated by depressing either the left pedal or the right pedal. The brake system comprises two parallel brake circuits. The first brake circuit has a first brake actuator, a first hydraulic line, a first flow regulating portion of a tandem brake valve

A work vehicle is provided with a brake system actuated by depressing either the left pedal or the right pedal. The brake system comprises two parallel brake circuits. The first brake circuit has a first brake actuator, a first hydraulic line, a first flow regulating portion of a tandem brake valve and a first accumulator. The second brake circuit has a second brake actuator, a second hydraulic line, a second flow regulating portion of the tandem brake valve and a second accumulator. To equalize the hydraulic pressure applied to the first and second brake actuators, an equalizer hydraulic line having an orifice extends between the first and second hydraulic lines. A force feedback hydraulic circuit is hydraulically positioned between the first and second hydraulic lines. The force feedback circuit comprises a first force feedback hydraulic line, a second force feedback hydraulic line and a force feedback hydraulic actuator. The first feedback line extends between the first and second hydraulic lines. The second feedback line extends from the first feedback line to the feedback actuator. The feedback actuator is mounted to the tandem brake valve. The first feedback line is provided with a shuttle check valve having a first inlet, a second inlet and an outlet. The first inlet is in fluid communication with the first hydraulic line and the second inlet is in fluid communication with the second hydraulic line. The outlet is hydraulically coupled to the second feedback line.

대표청구항 ▼

1. A brake system for a work vehicle having a supporting structure and ground engaging wheels for propelling the vehicle, the brake system comprising:a source of pressurized fluid; a tandem brake valve having a first flow regulating portion and a second flow-regulating portion, the tandem brake valv

1. A brake system for a work vehicle having a supporting structure and ground engaging wheels for propelling the vehicle, the brake system comprising:a source of pressurized fluid; a tandem brake valve having a first flow regulating portion and a second flow-regulating portion, the tandem brake valve having two operator controlled elements for shifting the tandem brake valve; a first brake circuit being in fluid communication with the source of pressurized fluid and the first flow regulating portion of the tandem brake valve, the first brake circuit being provided with a first braking actuator for braking the vehicle, a first hydraulic line extending between the first brake actuator and the first flow regulating portion of the tandem brake valve; a second brake circuit being in fluid communication with the source of pressurized fluid and the second flow regulating portion of the tandem brake valve, the second brake circuit being provided with a second braking actuator for braking the vehicle, a second hydraulic line extending between the second brake actuator and the second flow regulating portion of the tandem brake valve; whereby a pressure equalization hydraulic line extends between the first hydraulic line and the second hydraulic line for equalizing pressure between the first and second hydraulic actuators.