Fan Drive - Kubota KX080-4 Workshop Manual

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KX080-4, WSM

4. FAN DRIVE

(1) Bimetallic Strip

(3) Flat Spring (Valve)

[At high temperature]

• When the temperature rises, the bimetallic strip (1) bends slightly, opening the supply orifice (4) via the linkage

of the piston (2) and the valve (3).

• Silicon oil flows from the supply orifice (4) into the torque transmission chamber (5), increasing the transmitted

torque and increasing fan RPM.

[At low temperature]

• The supply orifice (4) closes and oil is not supplied to the torque transmission chamber (5).

• As the part colored in blue is directly coupled to the engine, it rotates at the same speed as the engine.

Conversely, the fan drive body turns at a lower RPM as there is little oil remaining in the torque transmission

chamber (5). (The blue part turns at high RPM and the fan body turns at low speed.)

• The oil from the torque transmission chamber (5) returns to the oil collection chamber (7) via the collection orifice

(4) Feed Orifice

(5) Torque Transmission

(6) Collection Orifice

(7) Oil Collection Chamber

A : At High Temperature

B : At Low Temperature

RY9212148END0004US0

KiSC issued 08, 2015 A

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