| 摘要 |
<p>The fan drive system comprises a constant pressure ring main circuit from a motor driven pump to, for example, three variable capacity motors (3) driving three fans (4). The motors are connected in parallel with each other and in series circuit with the pump and each has a piston and cylinder device (5) supplied with pressure from the ring main. A variable restrictor controlled by a temperature probe sets the pressure acting on each piston and cylinder device so that each fan is speed controlled in accordance with temperature. The variable orifice (8) controls the flow of hydraulic fluid to the reservoir (10), varying the piston and cylinder pressure, and hence motor torque.</p> |
