초록 ▼

A boom and drive train hydraulic system is described having a pressure source, preferably a pump operated by a motor, said pressure source providing hydraulic fluid at a high pressure to a first set of valves used to operate the drive train of the system. The first set of valves is equipped with a p

A boom and drive train hydraulic system is described having a pressure source, preferably a pump operated by a motor, said pressure source providing hydraulic fluid at a high pressure to a first set of valves used to operate the drive train of the system. The first set of valves is equipped with a power beyond for allowing the hydraulic fluid to flow from the first set of valves to a second set of valves. At the second set of valves a pressure control is provided to reduce the pressure to a desired lower pressure. The second set of valves provides the hydraulic fluid at this reduced pressure to the boom portion of the system. The differential of the pressures is approximately 5,000 psi for the track system and approximately 2,500 psi for the boom system.

대표청구항 ▼

[ I claim:] [1.] A dual hydraulic pressure system for operating at least one high pressure motor and at least one low pressure motor comprising;A) at least one pump means for providing a source of high pressure fluid;B) at least one valve for operating a high pressure hydraulic device, said at least

[ I claim:] [1.] A dual hydraulic pressure system for operating at least one high pressure motor and at least one low pressure motor comprising;A) at least one pump means for providing a source of high pressure fluid;B) at least one valve for operating a high pressure hydraulic device, said at least one valve having an inlet and an outlet for receiving and returning hydraulic fluid at a return pressure from the pump source respectively;C) at least one power beyond said power beyond having an inlet for receiving hydraulic fluid from the at least one valve outlet at the return pressure, a line having an input and an output, said input attached to the power beyond,D) at least one second valve having a valve input, said valve input being attached to the line output, and a converter means connected to the valve input for converting the hydraulic fluid from the at least one power beyond to a lower beyond pressure at the at least one power beyond outlet so that the at least one second valve may operate a low pressure hydraulic fluid device at the lower beyond pressure.