[특허]Hydrostatic transmission control system for improved hillside operation

Hydrostatic transmission control system for improved hillside operation 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16H-039/46
출원번호	US-0907227 (1978-05-18)
발명자 / 주소	Knapp Kenneth K. (Spencer IA)
출원인 / 주소	Eaton Corporation (Cleveland OH 02)
인용정보	피인용 횟수 : 61 인용 특허 : 0

초록 ▼

A hydrostatic transmission control system is provided of the type utilizing a main control valve to vary the control pressure being ported to the strokers which control the swashplate position of a variable displacement pump. The control valve includes a control port connected to a source of control pressure fluid and a pair of stroker ports, each of which is connected to one of the strokers. The control valve includes a valve member having a valve land associated with each of the stroker ports, the lands preferably being either zero-lapped or under-lapped and disposed to provide a substantially zero neutral band to provide an improved control response when it is necessary for the valve member to cross the neutral band and port control pressure to the opposite stroker. The control system further includes a positive neutral arrangement wherein movement of the control lever to the neutral setting energizes a valve, preferably a solenoid valve, which interconnects the lines leading from the stroker ports to the stroking cylinders, to insure zero swashplate displacement, despite the use of the zero neutral band control valve.

대표청구항 ▼

A hydrostatic transmission including a motor unit connected in fluid communication with a pump unit, and fluid operable means for varying the displacement of the swashplate of one of said units in first and second opposite directions, said hydrostatic transmission further comprising: (a) a source of control pressure fluid; (b) main control valve means having a control port in fluid communication with said source of control pressure fluid, said control valve means including first and second stroker ports communicating with said fluid operable means; (c) said main control valve means including a valve member having a neutral position blocking fluid communication between said control port and said stroker ports, a first control position communicating fluid from said control port to said first stroker port to exert a biasing force on said fluid operable means to move the swashplate in said first direction while draining fluid exerting a biasing force on said fluid operable means tending to move the swashplate in said second direction, and a second control position communicating fluid from said control port to said second stroker port to exert a biasing force on said fluid operable means to move the swashplate in said second direction while draining fluid exerting a biasing force on said fluid operable means tending to move the swashplate in said first direction; (d) control means operatively associated with said valve member and having a neutral setting corresponding to said neutral position of said valve member, said control means including follow-up means for adjusting the position of said valve member in response to movement of the swashplate; (e) said valve member of said main control valve means having a substantially zero neutral band; (f) neutral valve means selectively operable to permit substantially unrestricted fluid communication between said first stroker port and said second stroker port; and (g) means operable to activate said neutral valve means when said control means is in said neutral setting and to deactivate said neutral valve means wheN said control means is moved away from said neutral setting.

이 특허를 인용한 특허 (61)

Windhorst,Scott E.; Reid,Bruce E., Assembly for use with a return to neutral mechanism.
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Windhorst,Scott E.; Reid,Bruce E., Assembly for use with a return to neutral mechanism.
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Raymond Hauser ; John Schreier, Axle driving device having lobed bearings.
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Hauser Raymond ; Schreler John ; Houser Michael ; Oolnk Juan Pedro Roberto A., Bypass for a hydrostatic transmission.
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Phanco,Eric S.; Rawski,Kenneth J., Bypass mechanism for a hydraulic drive device.
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Phanco, Eric S.; Rawski, Kenneth J., Center section for a hydrostatic transaxle.
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Rawski, Kenneth J., Center section for hydraulic drive apparatus.
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Trimble, Robert, Control device for hydraulic pump.
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Hauser Raymond M. ; Langenfeld Thomas J. ; Ward William H., Control device for hydrostatic apparatus.
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Wiley, Thomas D.; Poplawski, Herb, Control mechanism for hydraulic devices.
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Hauser, Raymond; Holder, Lonnie E., Dual pump.
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Hauser, Raymond; Holder, Lonnie E., Dual pump.
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Bennett,Michael L., Dual pump apparatus.
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Hauser, Raymond; Bennett, Michael L., Dual pump apparatus with power take off.
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Hauser,Raymond; Holder,Lonnie E., Dual pump transmission.
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Holder, Lonnie E.; Trimble, Robert E.; Todd, Michael, Dual pump transmission.
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Holder,Lonnie E.; Todd,Michael; Trimble,Robert E., Dual pump transmission.
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Trefz, Harlin J.; Wetzel, Ted, Engine with integral actuator.
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Phanco, Eric S.; Given, Patricia J.; Wahner, Adam W., Filter assembly for a hydrostatic transaxle.
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Hauser, Raymond; Schreier, John, Filter for hydrostatic device.
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Hauser Raymond M. ; Holder Lonnie E. ; Schreier John D. ; Sporrer Ronald J. ; Bennett Michael Lee, Housing and center section for hydrostatic transmission.
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Brandenburg, Neil; Wilson, Jeffrey A.; Poplawski, Herb, Hydraulic apparatus with return to neutral mechanism.
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Poplawski, Herb; Taylor, Michael W.; Buescher, Ryan S., Hydraulic apparatus with return to neutral mechanism.
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Poplawski,Herb; Taylor,Michael; Buescher,Ryan S.; Wilson,Jeffrey A.; Brandenburg,Neil, Hydraulic apparatus with return to neutral mechanism.
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Akihito Okuda JP; Shigeru Morimoto JP; Koichi Fushimi JP, Hydraulic controller for variable capacity hydraulic transmission.
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Hauser, Raymond; Schreier, John, Hydrostatic Transmission.
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Phanco, Eric S.; Rawski, Kenneth J., Hydrostatic transaxle.
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Phanco, Eric S.; Rawski, Kenneth J., Hydrostatic transaxle.
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Phanco, Eric S.; Rawski, Kenneth J.; Ward, William H., Hydrostatic transaxle.
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Hauser Raymond ; Schreier John ; Houser Michael ; Ooink Juan Pedro Roberto A., Hydrostatic transmission.
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Hauser Raymond ; Wigness Craig ; Langenfeld Thomas ; Ward William Herbert, Hydrostatic transmission.
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Hauser,Raymond; Schreier,John, Hydrostatic transmission.
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Hauser,Raymond; Schreier,John D., Hydrostatic transmission.
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Raymond Hauser ; John Schreier, Hydrostatic transmission.
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Raymond M. Hauser ; Lonnie E. Holder ; John D. Schreier ; Ronald J. Sporrer ; Michael Lee Bennett, Hydrostatic transmission.
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Schreier, John, Hydrostatic transmission.
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Trefz, Harlin J.; Wetzel, Ted, Hydrostatic transmission with integral actuator.
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Graf Kevin J. (Eden Prairie MN), Hydrostatic transmission with motor start control system.
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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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van der Lely Cornelis (7 Brschenrain Zug CHX), Motor vehicle with driving speed responsive to change in attachment load.
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Mickelson Roger D. (West Burlington IA) Brown Thomas R. (Yarmouth IA), Pressure-compensating hydraulic system for preventing unauthorized use of a material handling implement.
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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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Trimble Robert, Pump.
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Trimble, Robert, Pump.
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Trimble, Robert, Pump.
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Trimble, Robert, Pump.
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Trimble, Robert E., Pump.
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Trimble,Robert, Pump.
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Trimble,Robert E., Pump.
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Artzberger Thomas G. (Menomonee Falls WI), Remote control system for a soil compactor.
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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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Hayashi Tsutomu (Tokyo JPX) Nakajima Yoshihiro (Tokyo JPX) Matsuto Takushi (Saitama JPX) Saito Mitsuru (Tokyo JPX) Sakakibara Kenji (Saitama JPX) Yamazaki Katsumi (Saitama JPX) Yakigaya Nobuyuki (Chi, Swashplate type variable displacement hydraulic device.
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Ward, William H., Tandem pump and interface for same.
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Ward, William H., Tandem pump and interface for same.
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William H. Ward, Tandem pump and interface for same.
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Phanco, Eric S.; Rawski, Kenneth J.; Given, Patricia J.; Ward, William H.; Holder, Lonnie E., Zero-turn hydrostatic transaxle.
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Rawski,Kenneth J., Zero-turn hydrostatic transaxle.
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Herb Poplawski ; Michael W. Taylor ; Ryan S. Buescher, Zero-turn transaxle with mounted return to neutral mechanism.
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Poplawski, Herb; Taylor, Michael W.; Buescher, Ryan S., Zero-turn transaxle with mounted return to neutral mechanism.
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Hydrostatic transmission control system for improved hillside operation 원문보기

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Hydrostatic transmission control system for improved hillside operation 원문보기

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