| 摘要 |
<p>A drive 21 for a fan of an internal combustion engine includes a clutch 71 connected between the engine and the fan blades 34, 35 and engageable by fluid pressure in the engine lubricating system under the control of an engine temperature responsive circuit 127, 128. The fan drive includes a fluid feed path 112, a return path 113, and a control path 101, but only two fluid connections 122, 123 to the clutch are necessary. When the temperature responsive circuit operates to disengage the clutch, a valve 131 releases the pressure in order to quickly disengage the clutch. <IMAGE></p> |
