Abstract In a vehicle having a transmission system and a brake system for providing a double braking force, a hydraulic brake control circuit is arranged for interconnecting both the transmission system and the brake system. In the hydraulic brake control circuit, a pump supplies oil under pressure from a supply source to a speed change valve of the transmission system and to a master cylinder of the brake system. A passage is provided from the oil pump and it branches off into separate passages leading to the speed change valve and to the master cylinder. In the passage leading to the speed change valve, a further branch passage is provided with a valve arrangement which is connected to the passage leading to the brake system. An accumulator is arranged in the passage to the brake system for affording a source of pressure for the doubled braking force in the brake system. A priority valve arrangement is connected to the passage leading to the brake system to assure a source of pressure for the proper operation of the brake system. To assure the proper source of pressure for the brake system, the oil passage is connected directly to the brake system and the brake system is connected, in turn, to the speed change valve.
A hydraulic brake control circuit connected to a transmission and to a brake system in a vehicle, comprises means for doubling the braking force in said brake system, means for effecting a speed change in said transmission, an oil pressure source, an oil pump connected to said oil pressure source, connecting means extending between said oil pump and both of said means for effecting a speed-change and said means for doubling a braking force for supplying pressurized oil from said oil pump to each of said means, said connecting means comprising a first passage containing a orifice for conveying pressurized oil from said pump to said speed-change means, a second passage extending in parallel with said first passage for conveying pressurized oil to said speed-change means from said pump, and unloader valve located in said second passage, a third passage extending between said oil pump and said means for doubling the braking force, an accumulator located in said third passage and in communication with said unloader for operating said unloader valve, a check valve positioned said third passage, and said means for doubling the braking force includes a master cylinder connected to said third passage downstream from said check valve and said accumulator.
Claim 2
Dependent Claim
203 words
A hydraulic brake control circuit connected to a transmission and to a brake system in a vehicle, comprises means for doubling the braking force in said brake system, means for effecting a speed change in said transmission, an oil pressure source, an oil pump connected to said oil pressure source, connecting means extending between said oil pump and both of said means for effecting a speed-change and said means for doubling a braking force for supplying pressurized oil from said oil pump to each of said means, said connecting means comprising a first passage containing a orifice for conveying pressurized oil from said pump to said speed-change means, a second passage extending in parallel with said first passage for conveying pressurized oil to said speed-change means from said pump, and unloader valve located in said second passage, a third passage extending between said oil pump and said means for doubling the braking force, an accumulator located in said third passage and in communication with said unloader for operating said unloader valve, a check valve positioned said third passage, and said means for doubling the braking force includes a master cylinder connected to said third passage downstream from said check valve and said accumulator.