[특허]Control and regulating device for a hydrostatic transmission

Control and regulating device for a hydrostatic transmission 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16D-031/02 F16D-039/00
출원번호	US-0746125 (1991-08-15)
우선권정보	DE-4029548 (1990-09-18)
발명자 / 주소	Schniederjan Reinhold (D-Neu-Ulm DEX) Wagenseil Ludwig (Vohringen DEX)
출원인 / 주소	Hydromatik GmbH (DEX 03)
인용정보	피인용 횟수 : 28 인용 특허 : 0

초록 ▼

The invention relates to a control and regulating device for a hydrostatic transmission which comprises a reversible hydraulic pump that can be driven by a driving motor, at least one hydraulic motor that is connected via two working lines to the hydraulic pump, and an adjusting device that can be acted on by an adjusting pressure for adjusting the volume and direction of displacement of the hydraulic pump, together with a displacement-direction control valve for controlling and regulating the action of the adjusting pressure on the adjusting device, can be actuated as desired both by a control signal that is proportional to the speed of rotation of the driving motor and predetermines the direction of displacement of the hydraulic pump and by a working pressure signal that is proportional to the working pressure in the working line then carrying the high pressure. To enable a load that has been decelerated to a standstill both to be maintained at a standstill and also to be shunted without mechanical braking, even when actuation of the displacement-direction control valve by the control signal is interrupted, the invention provides for switching over the working pressure signal applied to the displacement-direction control valve in the absence of the control signal.

대표청구항 ▼

A control and regulating device for a hydrostatic transmission, comprising: a variable volume hydraulic pump for pressurizing a hydraulic fluid, and having a first mode for discharging pressurized hydraulic fluid in a first direction, and a second mode for discharging pressurized hydraulic fluid in a second direction; means to connect the hydraulic pump to a driving motor to drive the hydraulic pump, the driving motor having a speed of rotation; at least one hydraulic motor; first and second working fluid lines for conducting pressurized hydraulic fluid between the hydraulic pump and the hydraulic motor to drive the hydraulic motor, the first working line receiving the pressurized hydraulic fluid from the hydraulic pump when the pup is in the first mode, and the second working line receiving the pressurized hydraulic fluid from the hydraulic pump when the pump is in the second mode; adjusting means connected to the hydraulic pump to control the mode of the pump and the volume thereof; means for applying an adjusting pressure to the adjusting means, and including a control valve for controlling and regulating the adjusting pressure applied to the adjusting means, the control valve having first and second control positions; switching means connected to the control valve to change the control valve between the first and second positions thereof; means to generate a control signal proportional to the speed of rotation of the driving motor, and to selectively conduct the control signal to the switching means; means to generate a working pressure signal proportional to the pressure of the hydraulic fluid in the one of the working fluid lines conducting pressurized fluid from the hydraulic pump to the hydraulic motor, and including first and second pressure lines connecting the switching means to the first and second working fluid lines respectively; wherein the switching means applies the working pressure signal to the control valve in one of two opposite directions; and wherein the switching means has first and second positions, and when the control signal is not conducted to the switching means, the switching means changes from one of the positions thereof to the other of the positions thereof to conduct the working pressure signal to the control valve to change the control valve form one of the positions thereof to the other of the positions thereof.

이 특허를 인용한 특허 (28)

Akasaka Tosiyuki,JPX ; Nunotani Sadao,JPX ; Hayashi Seita,JPX, Capacity control device for a hydraulic motor for a hydraulically driven vehicle.
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Thoms, Reinhardt, Control device for hydrostatic drives.
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Kado, Hideki; Yamamoto, Yuuichi, Forward/backward switching control apparatus for hydraulic drive vehicle, and control method therefor.
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Morrow, David John; Chambers, Keith David Robert; McGowan, David John; Gordon, Peter Thomas Alexander; Desai, Paresh Rameschchandra; Hill, Stephen Francis, Gen-Set control system having proactive load relief.
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James D. Ryken, Hydraulic control cold start neutral valve.
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Akihito Okuda JP; Shigeru Morimoto JP; Koichi Fushimi JP, Hydraulic controller for variable capacity hydraulic transmission.
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Diebold, Martin; Mayer, Martin; Münzenmaier, Werner, Hydraulic drive system and method for driving a belt conveyor.
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Sakamoto, Kunihiko, Hydraulic stepless speed changing device.
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Sakamoto, Kunihiko, Hydraulic stepless transmission.
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Legner Jurgen,DEX ; Mann Egon,DEX ; Stutzle Siegfried,DEX, Hydromechanical traveling mechanism.
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Rinck, Stefan; Girschikofsky, G?nter, Hydrostatic drive and method for operating such a hydrostatic drive.
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Stuermer, Burkhard, Hydrostatic positive displacement machine.
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Bausenhart Heinz (Nersingen-Leibi DEX) Leibing Karl-Heinz (Gerstetten-Dettihgen DEX), Hydrostatic travelling drive.
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Nishi,Eiji; Nishi,Keishiro; Shinkai,Atsushi; Nakatani,Yasunobu; Okamoto,Muneji; Sugihara,Yoichi, Load control structure for work vehicle.
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Dix, Peter J.; Bulgrien, Garth H.; Prasse, Robert C; Kuros, Pavel, Method of calibration of a hydraulically operated clutch of a continuously variable transmission using pressure between a hydrostatic pump and motor.
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Dix, Peter J.; Bulgrien, Garth H.; Prasse, Robert C; Kuros, Pavel, Method of calibration of a park brake of a continuously variable transmission.
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Guo, Haibo; Dix, Peter J.; Bulgrien, Garth H.; Hartman, Brian A.; Prasse, Robert C.; Weeramantry, Cecil A.; Felsing, Brian E., Method of using feedforward compensation based on pressure feedback for controlling swash plate angle in a hydrostatic power unit of a continuously variable transmission.
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Gollner Wilhelm (Neumunster DEX), Method to calibrate a hydrostatic transmission with electronic controls.
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Schuh, Scott N., Motion stop control for vehicle.
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Schuh, Scott N., Motion stop control for vehicle.
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Guven,Mustafa K.; Kuras,Brian D.; Vanderham,Michael E., Predictive load management system.
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Dix, Peter J.; Bulgrien, Garth H.; Prasse, Robert C; Kuros, Pavel, Proportional parking brake control in cooperation with operation of a continuously variable transmission.
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Dix, Peter J.; Bulgrien, Garth H.; Hartman, Brian A.; Prasse, Robert C., Shuttle shifting for a continuously variable transmission.
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Ohkura Yasunori,JPX ; Hiraki Hikosaburo,JPX ; Kanayama Noboru,JPX ; Makida Ryutaro,JPX, Speed changing device for hydraulic driving apparatus and speed change control method thereof.
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Nishi, Eiji; Nishi, Keishiro; Shinkai, Atsushi; Nakatani, Yasunobu, Speed control structure and method for work vehicle.
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Schottler Joseph Julius ; Hall C. Kells, Speed sensing device.
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Krieger Daniel J. ; Wetzel Michael D., Variable pilot pressure control for pilot valves.
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Nomura, Hitoshi; Hayashi, Keiichi; Yuki, Hidehiro, Working vehicle with HST.
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