IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0327748
(2002-12-23)
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발명자
/ 주소 |
- Shore, Daniel B.
- Dix, Peter J.
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출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
18 인용 특허 :
6 |
초록
▼
A work vehicle having a hydrostatic drive system provides for the recovery and reuse of the vehicle's kinetic energy by conducting pressurized hydraulic fluid out of the hydrostatic drive system into an accumulator during vehicle deceleration, and conducting the pressurized fluid back into the drive
A work vehicle having a hydrostatic drive system provides for the recovery and reuse of the vehicle's kinetic energy by conducting pressurized hydraulic fluid out of the hydrostatic drive system into an accumulator during vehicle deceleration, and conducting the pressurized fluid back into the drive system during vehicle acceleration to assist the vehicle's engine in accelerating the vehicle.
대표청구항
▼
1. An energy-recovering hydraulic drive system for a work vehicle, comprising:an internal combustion engine;a drive wheel;a gas-charged hydraulic fluid accumulator;a hydraulic reservoir; anda closed loop hydrostatic drive circuit, including a pump, a drive motor, a first conduit, a second conduit an
1. An energy-recovering hydraulic drive system for a work vehicle, comprising:an internal combustion engine;a drive wheel;a gas-charged hydraulic fluid accumulator;a hydraulic reservoir; anda closed loop hydrostatic drive circuit, including a pump, a drive motor, a first conduit, a second conduit and a valve assembly,the drive pump being drivingly coupled to the engine and including first and second pump ports, each of the first and second pump ports functioning as both a hydraulic fluid inlet and a hydraulic fluid outlet,the drive motor including first and second motor ports, each of the first and second motor ports functioning as both a hydraulic fluid inlet and a hydraulic fluid outlet,the drive motor being coupled to the drive wheel to drive the work vehicle over the ground,the first conduit being in fluid communication with the first pump port and the first motor port,the second conduit being in fluid communication with second pump port and the second motor port, andthe valve assembly being in selectively changeable between (1) a first configuration in which a first portion of hydraulic fluid leaving the first pump port is directed into the accumulator and simultaneously an amount of hydraulic fluid is directed from the reservoir into the first motor port; and (2) a second configuration in which a second portion of hydraulic fluid leaving the second port of the motor is directed into the reservoir and simultaneously an amount of hydraulic fluid is directed from the accumulator into the second port of the pump.2. The hydraulic drive system of claim 1, further comprising a charge pump in fluid communication with and coupled between the reservoir and the valve assembly.3. The hydraulic drive system of claim 2, further comprising a pressure relief valve in fluid communication with and coupled between the reservoir and the valve assembly.4. The hydraulic drive system of claim 3 wherein the drive pump is a continuously variable displacement pump.5. The hydraulic drive system of claim 4 further comprising an electronic control circuit and manual operator controls configured to generate signals indicative of a desired vehicle speed and direction of travel, wherein the manual operator controls are coupled to the electronic control circuit to provide signals indicative of the desired direction of travel and the desired speed, wherein the electronic control circuit is coupled to the valve assembly to reconfigure the valve based at least in part upon signals indicative of motion of the vehicle.6. The hydraulic drive system of claim 5, wherein the signals are provided by the manual operator controls.7. The hydraulic drive system of claim 6, wherein the valve assembly has a third selectable configuration in which a third portion of hydraulic fluid leaving the second motor port is directed into the accumulator, and a fourth configuration in which a fourth portion of hydraulic fluid is directed from the second pump port into the reservoir.8. An energy-recovering hydraulic drive system for a work vehicle, comprising:an internal combustion engine;a drive wheel;a gas-charged hydraulic fluid accumulator;a hydraulic reservoir; anda closed loop hydrostatic drive circuit including a hydraulic pump drivingly coupled to the engine, at least one motor and a valve assembly,the pump including a pump high pressure port and a pump low pressure port, the motor including a motor high pressure port and a motor low pressure port, and the valve assembly being selectively configured to direct hydraulic fluid leaving the pump high pressure port into the accumulator to charge the accumulator.9. The hydraulic drive system of claim 8, wherein the valve assembly is selectively configured to simultaneously direct hydraulic fluid stored in the accumulator into the pump low pressure port and from the motor low pressure port into the reservoir.10. The hydraulic drive system of claim 8, further comprising a charge pump in fluid communication with and disposed between the reservoir and the valve assembly.11. The hydraulic drive system of claim 10, wherein the valve assembly is selectively configured to direct hydraulic fluid leaving the charge pump to one of the pump low pressure port and the motor high pressure port.12. The hydraulic drive system of claim 8, further comprising an electronic control circuit and manual operator controls configured to generate signals indicative of a desired vehicle speed and direction of travel, wherein the manual operator controls are coupled to the electronic control circuit to provide signals indicative of the operator's desired direction of travel and the desired speed, and wherein the electronic control circuit is coupled to the valve assembly to reconfigure the valve based at least in part upon signals indicative of motion of the vehicle.13. The hydraulic drive system of claim 12, further comprising first and second hydraulic pressure sensors in fluid communication with the hydrostatic drive circuit, wherein the signals are provided at least in part by the first and second hydraulic pressure sensors.14. The hydraulic drive system of claim 12, wherein the electronic control circuit reconfigures the valve assembly based at least upon the signals indicative of the motion of the vehicle.15. The hydraulic drive system of claim 8, wherein the valve assembly is selectively configured to direct hydraulic fluid from the reservoir into the motor low pressure port.16. The hydraulic drive system of claim 8, wherein the valve assembly is selectively configured to simultaneously direct hydraulic fluid leaving the pump high pressure port into the accumulator to charge the accumulator and hydraulic fluid from the reservoir into the motor high pressure port.
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