Compensated governor

Abstract

Abstract This disclosure shows a compensating device for a flyweight governor. As usual the latter has a pilot valve and a spring normally urging it toward a position to admit fluid pressure to a propeller pitch varying means to decrease the engine load. The flyweights move the pilot valve against the spring force, as engine speed increases, to reduce the fluid pressure and cause the propeller pitch to change to increase the load on the engine. This action will decrease engine speed. The propeller thus assists in governing the rate of engine operation. According to the invention the operation of the governor is stabilized by providing it with compensating means, having a chamber divided into two sections by a movable wall. The wall has a resilient connection with the pilot valve and is normally balanced by equal fluid pressures on both sides. It has one side exposed to compressor pressure produced by the engine and when this pressure increases the wall moves to decrease the spring load applied to the pilot valve. This action permits the pilot valve to start to reduce the application of fluid pressure to the propeller pitch varying mechanism even before the flyweights can respond normally to increasing engine speed. The movable wall has a bleed orifice to permit pressure equalization and a restoration of the normal setting of the pilot valve spring shortly after this operation. When compressor pressure decreases the compensating means functions in the opposite manner. It should be noted that the compensating means moves the pilot valve in the same direction as the flyweights.

Inventors

• 👤 John C White

Bibliographic Details