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Hydraulic drive system for vehicle

閱讀：204發(fā)布：2020-11-05

專利匯可以提供Hydraulic drive system for vehicle專利檢索，專利查詢，專利分析的服務(wù)。并且A hydraulic system is described for a hydraulically propelled four-wheel drive vehicle which also carries and provides power for a large hydraulically powered load device. The system is an open loop or modified open loop system permitting straightforward additions of auxiliary equipment and other load devices as needed. The high pressure pump output is connected to the individual wheel motors through reversible manually operated valves. The front wheel circuits include special valve means for permitting the front wheels to ''''free wheel'''' when four-wheel drive is not desired. A plurality of lines having adjustable orifices provide fluid connections between the pairs of front and rear wheels to provide differential type action. Similar lines between front and rear wheel circuits provide front-to-rear differential action. Each wheel is operative in either of two speed ranges, and additional manually operated valve means enables the operator to select whether he wishes to operate in low or high speed range.，下面是Hydraulic drive system for vehicle專利的具體信息內(nèi)容。

1. A propulsion and control system for a hydraulically propelled vehicle comprising a prime mover, a high pressure pump driven by said prime mover, a first pair of hydraulically driven motors operative as front wheels for said vehicle, a second pair of hydraulically driven motors operative as rear wheels for said vehicle, conduit means including first and second channels connecting said high pressure pump to each of said motors, manually operable proportioning type valve means connected in said conduit means between the output of said high pressure pump and said motors, said valve means being capable of reversing the flow through said motors; control valve means connected between one of said pairs of motors and said proportioning type valve means operative when in a first position to block high pressure fluid to said one pair of motors and operative when in a second position to admit high pressure fluid to said one pair of motors; and a manually operable two-position valve for controlling said control valve means; and first and second conduits containing restricted orifices interconnecting the first and second channels, respectively, to said rear wheel motors, third and fourth conduits containing restricted orifices interconnecting the first and second channels respectively to said rear wheel motors, third and fourth conduits containing restricted orifices interconnecting the first and second channels respectively to said front wheel motors, fifth and sixth conduits containing restricted orifices and check valve means interconnecting said first and second channels, respectively, to said front and rear wheel motors, said check valves being operative to close said conduits when said control valve means is in said first position.
2. A hydraulic drive system for a vehicle including a load device carried thereon, said vehicle including a plurality of hydraulically driven wheel motors having two speed ranges, a pair of front wheels for the vehicle, a pair of rear wheels for the vehicle, a prime mover, a high pressure pump driven by said prime mover, and conduit means including separate first and second channels connecting said pump to each of said hydraulically driven motors, and additional conduit means connecting said load across said high pressure pump; operator-operated control means in each of said first and second channels including a reversible modulating valve for variably controlling flow of working fluid from said pump through said first and second channels to said hydraulically driven motor to control speed and direction of said motor, and a two-speed valve means downstream of said modulating valve for selecting a motor speed range; a first conduit connecting the first channel of said conduit means for one of said wheels with the first channel of said conduit means for a paired wheel, and a variable orifice in said first conduit, and a second conduit connecting the second channel of said conduit means for said one of said wheels with the second channel of said conduit means for the said paired wheel, and a variable orifice in said second conduit, such that when said paired wheels are caused to turn, working fluid may flow through said orifices to permit the paired wheels to rotate at different speeds; and separate free wheeling valve means connected between each wheel of said one of said pairs of wheels and its corresponding modulating valve, said valve means being selectively operative to block the flow of high pressure fluid to said pair of wheels to permit said pair of wheels to free wheel while the vehicle is driven by the opposite pair of wheels.
3. A hydraulic drive system for a vehicle as set forth in claim 2 wherein third and fourth conduits are provided connecting the corresponding first and second channels of said conduit means for said opposite pair of wheels, each of said third and fourth conduits having variable orifices, and fifth and sixth conduits interconnecting said first and second channels for said first named pair of wheels with the first and sEcond channels for said opposite pair of wheels, said fifth and sixth conduits including variable orifices and check valve means operative in response to free wheeling of said first named pair of wheels to block flow therethrough.
4. A hydraulic system for a vehicle as set forth in claim 3 wherein an auxiliary pump is connected to the inlet line to said high pressure pump to maintain adequate inlet pressure to prevent cavitation of said pump and a boost pump is driven by said auxiliary pump to provide pressure to operate said free wheeling valves and said two-speed valve means.
5. A hydraulic system for a vehicle as set forth in claim 2 wherein said hydraulically driven motors have two-speed capability with two inlet ports and an outlet port and are reversible by connecting high pressure pump output to said outlet port, said modulating valves being operable to cause proportional operation of said motors in either direction and said two-speed valve means are selectively operable to supply high pressure pump output to one of said inlet ports or to both of said inlet ports.
6. A hydraulic system for a vehicle as set forth in claim 5 wherein said motors have an additional port connected to a low pressure source and pressure regulating means are supplied to maintain said low pressure source at a pressure level substantially higher than atmospheric or drain pressure, and an accumulator is connected to each said additional port and said pressure-regulating means to abosrb any pressure surges in said motors.
7. A hydraulic system for a vehicle as set forth in claim 2 wherein one of said first or second channels is a return pressure line connected to said hydraulically driven motors and to said operator-operated control means and an auxiliary pump is provided to maintain the pressure in said return line at a level significantly higher than the inlet pressure to said high pressure pump.
8. A hydraulic system for a vehicle as set forth in claim 7 wherein at least one oil cooler is connected between said return line and the inlet line to said high pressure pump.
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