Invention Grant
- Patent Title: Hydraulic system having low speed operation
- Patent Title (中): 液压系统低速运行
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Application No.: US13963150Application Date: 2013-08-09
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Publication No.: US09366272B2Publication Date: 2016-06-14
- Inventor: Susan E. Bieker , Eric P. Jakubiak , Dennis R. Barber , John J. Kaufman , Edward W. Mate , Scott D. Vollmer , Michael D. Hudson , Moses I. Akpan
- Applicant: Caterpillar Inc.
- Applicant Address: US IL Peoria
- Assignee: Caterpillar Inc.
- Current Assignee: Caterpillar Inc.
- Current Assignee Address: US IL Peoria
- Agent Edward Lin
- Main IPC: F15B15/02
- IPC: F15B15/02 ; E02F9/08 ; E02F9/22 ; F16H61/433 ; F16H61/465 ; F01P7/04

Abstract:
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.
Public/Granted literature
- US20150040548A1 HYDRAULIC SYSTEM HAVING LOW SPEED OPERATION Public/Granted day:2015-02-12
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