Abstract: A fluid pressure operated servomotor having a housing shell containing a flexible diaphragm forming a fluid pressure chamber with a port through the housing connectable for receiving a fluid pressure signal. The diaphragm has a rigid insert extending therethrough and sealed thereabout with a cup shape on the interior of the chamber and having a rod pivot surface formed on the exterior side of the diaphragm. A spring inside the chamber has one end registered in the cupped shape to bias the diaphragm insert in one direction. In one embodiment, the insert is shaped to have a rod pivot surface nested in the coils spring such that the rod pivot load resists lateral buckling of the spring; and, in another embodiment, a shroud is formed on the insert about the rod pivot surface for limiting rotation of the insert with respect to the rod end.

Abstract: Disclosed is a speed controlled fluid pressure regulator that is adapted to provide a fluid pressure control signal for use in a variety of control functions in response to changes in rotational speed of an object such as a rotating component of an internal combustion engine. The regulator is controlled by a speed biasing mechanism that utilizes a counterbalancing arrangement between a biasing means and a component that is moved by a centrifugal weight assembly in response to changes in the rotational speed of the object being monitored to position a valve of the regulator with a high degree of sensitivity which in turn enables the regulator to provide the output fluid pressure control signal from a fluid pressure source in a highly effective manner.