Layered diaphragm
AssigneeWalbro Corporation
InventorGeorge M. Pattullo
Life of this patent
Estimating the term…
Abstract
A carburetor may have a fuel metering assembly with a metering valve and a metering diaphragm sealed to a body of the carburetor to at least partially define a metering chamber with a portion of the metering diaphragm movable relative to the body to actuate a fuel metering valve. The diaphragm may include a continuous layer, a discontinuous layer, and an intermediate layer received at least partially between the continuous and discontinuous layers and at least partially inhibiting direct contact between the continuous and discontinuous layers. The continuous and discontinuous layers may be different polymer materials and the intermediate layer may be a polymer different than that of the discontinuous layer. The intermediate layer may include voids, segments, or a wire form.
Claims17
A carburetor having a metering system that controls fuel flow from a fuel source to an air-fuel passage, the metering system comprising:
- a metering assembly including a metering valve and a metering diaphragm sealed to a body of the carburetor to at least partly define a metering chamber between the metering diaphragm and the body, the metering diaphragm having a portion that is moveable relative to the body to actuate the metering valve, and the metering diaphragm including a continuous layer, a discontinuous layer and an intermediate layer received at least partially between the continuous layer and the discontinuous layer;
- wherein the continuous layer is responsive to fluid pressure to move the discontinuous layer to open a metering valve to allow fuel flow from the fuel source into the metering chamber.
A carburetor, comprising:
- first and second bodies;
- a fuel chamber located between the first and second bodies;
- a multilayer diaphragm clamped between the first and second bodies, the diaphragm comprising a first layer of discontinuous material, a second layer of a continuous different material and a third layer of material positioned at least partially between the first and second layers of material;
- and
- a fuel flow valve that opens and closes to allow fuel flow into or out of the fuel chamber, wherein the first layer of discontinuous material flexes to selectively actuate the fuel flow valve, and the second layer of continuous material defines a portion of the fuel chamber and moves in response to a pressure differential across the second layer of continuous material, and wherein the third layer of material at least substantially inhibits direct contact of the first layer of material with the second layer of material.
Dependencies are inferred from the claim text.