[특허]Hydraulic-drive system for an intermittent-demand load

[미국특허] Hydraulic-drive system for an intermittent-demand load 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16D-031/02
출원번호	US-0075780 (1987-07-20)
발명자 / 주소	Rosman Alan H. (21601 Erwin St. Woodland Hills CA 91367)
인용정보	피인용 횟수 : 16 인용 특허 : 0

초록 ▼

A prime-mover driven variable-rate pump of relatively great flow capacity is in delivery and return-circuit connection to an intermittently loaded hydraulic motor. A fixed-rate pump of substantially less capacity is continuously driven by the prime-mover, to charge a hydraulic accumulator, there being a safety relief to sump when a predetermined high-pressure threshold is reached. The accumulator is exclusively connected to the inlet of the variable-rate pump, being isolated by check valves from delivering any reverse flow to the fixed-rate pump and from delivering any reverse flow to the return portion of the motor-driving circuit. In said return portion, and between its check valve and the motor, a “dump”valve is operable for transient diversion of return flow to sump, thereby transiently enabling enhanced load-accelerating torque from the motor; this valve is preferably pressure-operated to “dump”position upon a load-reflecting pressure rise in the supply line from the variable-rate pump to the motor. Normal motor-running speeds are selectively determined by the variable-rate pump; and load-reflected angular momentum causes the motor to pump return fluid at elevated pressure, in partial recharge of the accumulator, thus assisting in braking the angular momentum while aiding in a recharge of the accumulator.

대표청구항 ▼

An energy-efficient hydraulic drive system for interposition between a prime-mover source of rotary power and a hydraulic motor for an intermittently driven load, said system comprising: first and second pumps connected to the rotary-power output of the prime-mover source; a hydraulic accumulator and a sump; said first pump being of fixed-rate variety and connected to draw hydraulic fluid from said sump and to deliver the same to said accumulator via a first check valve oriented to prevent reverse flow, with relief-valve discharge to sump upon achievement of a predetermined high pressure of accumulated charge; said second pump being of variable-rate variety and having substantially greater flow capacity than said first pump; a fluid-delivery line from said accumulator to said motor via said second pump; a fluid-return line from said motor to said accumulator via a second check valve oriented to prevent reversal of fluid-return flow; and a dumping valve interposed between said motor and said second check valve for transient diversion of return flow to sump, whereby to transiently enable enhanced load-accelerating torque from said motor; further whereby motor-running speed may be selectively determined by said second pump, and, upon reducing the flow-rate setting of said second pump, reflected load momentum causes said motor to pump return fluid in partial recharge of said accumulator.

이 특허를 인용한 특허 (16) 인용/피인용 타임라인 분석

Versteyhe, Mark R J; Dutre, Mathieu P E; Vandoorsselaere, Veerle; De Beer, Bart; Meertens, Bruno; Vyncke, Thomas J.; De Kooning, Jonas, Accumulator assisted hydrostatic driveline and optimization method thereof.
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Mushika Sadahiko (Ichinomiya JPX) Suzuki Akira (Nishio JPX), Apparatus for driving a medical appliance.
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Persson, Bengt Goran; Nilsson, Peter, Arrangement for operating a hydraulic device.
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Kuttler, Onno; Wadsley, Luke; Gandrud, Michael D.; Joly, Pierre, Charged hydraulic system.
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Poorman Bryan G., Closed loop hydraulic system with variable charge pressure.
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Rosman, Allan, Compressed gas container as frame of vehicle.
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Miki Masatoshi,JPX ; Yoshino Kazunori,JPX ; Samejima Makoto,JPX ; Akaki Tomohiro,JPX ; Mitsumori Shigeyoshi,JPX, Control apparatus for construction machine.
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Jacobson, James D.; Bui, Tuan; Garchow, Stephen R.; Yardimci, Atif; Slepicka, James S., Fluid delivery system and flow control therefor.
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Jacobson, James D.; Bui, Tuan; Garchow, Stephen R.; Yardimci, Atif; Slepicka, James S., Fluid delivery system and flow control therefor.
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Jacobson, James D.; Bui, Tuan; Garchow, Stephen R.; Yardimci, Atif; Slepicka, James S., Fluid delivery system and flow control therefor.
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Heren, Jean; Lemaire, Gilles, Hydraulic energy recovery system.
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Doberschuetz, Christian, Hydraulic fluid pump of a vehicle brake system having a delivery means.
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Kawahara Eiichiro (Saitama JPX) Iino Takashi (Saitama JPX) Katagiri Yoshihiro (Saitama JPX) Sawa Yasuhiro (Saitama JPX), Hydraulically operated continuously variable transmission.
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Mueller, Matthias, Hydrostatic drive with braking energy recovery.
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McMahan Gene (Ventura CA) Farber Bruce (Oakview CA) Conley Thomas (Oakview CA), Seawater power source for seawater powered tools.
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Styron, Joshua Putman; Parry-Jones, Richard, Variable compression ratio control system for an internal combustion engine.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Hydraulic-drive system for an intermittent-demand load 원문보기