[특허]Drive system of a utility vehicle

[미국특허] Drive system of a utility vehicle 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B60K-017/00
출원번호	US-0389854 (2003-03-14)
우선권정보	DE-102 11 799(2002-03-16)
발명자 / 주소	Kempf,Bernd Hofer,J체rgen Bohrer,Stefan
출원인 / 주소	Deere & Company
인용정보	피인용 횟수 : 12 인용 특허 : 12

초록 ▼

A drive system for use in utility vehicles, such as agricultural forage harvesters and combines, includes a hydrostatic transmission having a pump driven by a main engine of the vehicle and having first and second motors respectively coupled to front and rear axles of the vehicle by way of first and second differential gear sets. The pump and one or both of the motors have a variable displacement determined by positioning respective swash plates through the agency of a lever, in the case of the pump, and by electronic devices, in the case of the motors, the electronic devices acting in response to control signals sent by a control arrangement, which in turn, operates in response to signals produced by pressure sensors associated with the motors and by signals produced by speed sensors associated with output shafts of the hydraulic motors. The control arrangement has a memory for storage of data, such as maximum legal ground speed and the ratio of the speeds of the axles as results from a given wheel size, and uses this information for controlling the hydrostatic transmission such that the vehicle does not exceed the speed, and the front and rear axles are driven so as to produce the same ground speed.

대표청구항 ▼

The invention claimed is: 1. In a utility vehicle having a drive system including a main drive engine connected so as to drive a hydraulic pump having an outlet and an inlet respectively coupled to an inlet and an outlet of a hydraulic motor so as to conduct hydraulic fluid to and from said hydraulic motor, with said hydraulic motor being connected so as to drive at least one wheel that is in engagement with the ground and whose fluid displacement can be varied by an actuator connected with a control arrangement, where said control arrangement is connected with a rotational speed sensor arranged to detect the rotational speed of the wheel and can be operated so as to control the actuator as a function of the signals of the rotational speed sensor, the improvement comprising: a pressure sensor coupled to said hydraulic motor for generating a pressure signal that contains information about the difference between pressures respectively existing at said inlet and the outlet of said hydraulic motor; said pressure sensor being connected to said control arrangement, with said pressure signal acting to effect operation of said control arrangement such that said control arrangement causes said actuator to be controlled as a function of the pressure signal received from said pressure sensor said actuator being an electronic actuator; an operating arrangement for selectively sending a target velocity signal to said control arrangement; and said control arrangement acting in response to said target velocity signal to control said electronic actuator so that said vehicle does not operate at a velocity in excess of the target velocity. 2. The utility vehicle, as defined in claim 1, wherein said drive system includes a load sensor connected for detecting a load imposed on the main engine and generating a representative load signal that is conveyed to said control arrangement; said control arrangement acting in response to said load signal for effecting a repositioning of said electronic actuator as a function of said load signal. 3. The utility vehicle, as defined in claim 2, wherein said vehicle is a crop harvester and said load sensor detects the load on said main engine by sensing one of a rotational speed of an output shaft of said engine, or a rate at which the utility vehicle is supplied with harvested crop.

이 특허에 인용된 특허 (12) 인용/피인용 타임라인 분석

Gray ; Jr. Charles L., Continuously smooth transmission.
상세보기
Schueler Robert A. (Oconomowoc WI), Control circuit for hydrostatic all wheel drive vehicle.
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Heinrich Scheid DE; Bernd Rabe DE, Drive system of an agricultural vehicle.
상세보기
Cathal McKenna IE; Eric O'Keeffe IE; Seamus Murchan IE, Hydraulic drive system.
상세보기
Ellertson Gary A. ; Chicoine Kellen J., Hydraulic system for vehicular traction drive.
상세보기
Cunningham, Sinclair, Hydrostatic drive.
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Tobias Jaromir (322 E. 57th St. New York NY 10022), Hydrostatic power transfer system with isolating accumulator.
상세보기
Yoshida Nobumi,JPX ; Endo Hiroshi,JPX ; Maruta Kazuhiro,JPX ; Ishizaki Naoki,JPX, Pressurized fluid supply system.
상세보기
Williams Keith R. ; Jansen Lynn T. ; Jennings Lon A., Traction control system and method for hydraulically propelled vehicles.
상세보기
Hiroshi Sawada JP; Seiichi Fuchita JP; Kouichi Kawamura JP; Toshio Yokoyama JP, Travel motor hydraulic control system for a construction machine.
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Lars Kjaer DK; Per Lindholdt DK; Asger Flintholm DK, Vehicle driving arrangement.
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Malik Sanjay ; Ferreira Lawrence ; Eisele Jeffrey ; Allyn Whewell, t-butyl cinnamate polymers and their use in photoresist compositions.
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이 특허를 인용한 특허 (12) 인용/피인용 타임라인 분석

Rose, Kenric B., Accumulator system and method of monitoring same.
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Sheidler, Alan; Pierce, Johann, Agricultural header presence sensor with traction control.
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Fukuda, Yuji; Ohtsukasa, Naritoshi, Controller of vehicle with hydrostatic continuously variable transmission.
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Dueckinghaus, Heinrich; Gersmann, Manfred, Electronic control for the drive unit of a vehicle.
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Rose, Kenric B.; Spadafora, William G.; Greif, Edward J., Energy storage system for a hybrid vehicle.
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Rose, Kenric B.; Spadafora, William G.; Greif, Edward J., Energy storage system for a hybrid vehicle.
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Rose, Kenric B.; Spadafora, William G., Hydraulic energy storage system with accumulator and method of varying charge of same.
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Delaney, Patrick M., Hydraulic hybrid four wheel drive.
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Hanamoto, Takahiro, Hydraulic-drive work vehicle.
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Schifferer, Andrew N.; Baus, John D., Method and system for controlling machine power.
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Storer, Corwin; Maiyur, Sudarshan, Pressure and speed control for a vehicle.
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Pruitt, Randall D.; Strashny, Igor, Systems and methods for controlling slip of vehicle drive members.
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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] Drive system of a utility vehicle 원문보기