Hydraulic system having low speed operation

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9366272
APP PUB NO 20150040548A1
SERIAL NO

13963150

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A hydraulic fan circuit is provided. The hydraulic fan circuit includes a tank, a motor having a fluid inlet and a fluid outlet and a pump to draw fluid at a low pressure from the tank and discharge the fluid at elevated pressures to the motor via the fluid inlet. The hydraulic fan circuit further includes a directional control valve disposed between the fluid outlet of the motor and the tank. The directional control valve is operable to move between a flow blocking position and a flow passing position. Further, the directional control valve is configured to reduce a positive speed of the motor below a lowest positive speed attainable through control of pump output. Furthermore, the hydraulic fan circuit includes a pressure control circuit configured to provide a pilot fluid flow at varying pressure to move the directional control valve.

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Patent Owner(s)

  • CATERPILLAR INC.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akpan, Moses I Moline, US 3 11
Barber, Dennis R Plainfield, US 15 252
Bieker, Susan E Minooka, US 1 7
Hudson, Michael D Mount Zion, US 28 2170
Jakubiak, Eric P Aurora, US 3 18
Kaufman, John J Yorkville, US 9 144
Mate, Edward W Manhattan, US 11 58
Vollmer, Scott D Naperville, US 3 17

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