Accession Number:

ADD002947

Title:

Hydraulic Fan Drive System Speed Control.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s):

• Kirchner,Harold G.

Report Date:

1976-03-09

Pagination or Media Count:

4.0

Abstract:

The patent relates to a device designed to limit or control the fan speed by using a drive mechanism that is controlled by a thermal power element responsive to coolant temperature. The control element is arranged to vary the displacement of a variable displacement pump that is driven from the engine. The pump output is delivered to a hydraulic motor that drives the fan. Variations in pump displacement produce varying hydraulic motor speeds, hence varying fan speeds. This is particularly applicable to powertrains using hydrokinetic or hydromechanical transmissions which require high cooling capacity at low engine speeds.

Descriptors:

• *Internal combustion engines
• *Cooling fans
• *Speed regulators
• *Patents
• Temperature sensitive elements
• Pumps
• Hydraulic servomechanisms

Subject Categories:

• Air Conditioning, Heating, Lighting and Ventilating
• Reciprocating and Rotating Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE