Backing plate means for a servomotor
AssigneeThe Bendix Corporation
InventorHarold H. Welsh, Jr.
Life of this patent
Estimating the term…
Abstract
A servomotor having a metal backing plate for a diaphragm which separates the interior of a front shell and a rear shell into a front chamber and rear chamber. The metal backing plate is attached to a hub which extends through the rear shell. The hub has an axial bore with a first passageway which is connected to the front chamber and a second passageway which is connected to the rear chamber. A control means is retained in the axial bore by the metal backing plate being attached to the hub. When the control means is actuated, fluid under pressure enters the rear chamber and creates a pressure differential. The pressure differential develops a force across the diaphragm which is directly transmitted through the backing plate to an output push rod.
Claims10
A servomotor for use in a vehicle, comprising:
- a housing having a front shell and a rear shell, said front shell and said rear shell being joined together to form a sealed cavity therein;
- diaphragm means having an external bead located between the front shell and the rear shell for establishing a front chamber and a rear chamber, said diaphragm means having an inner bead separated from an annular rib, said diaphragm means having a sleeve section which extends rearwardly from said annular rib, said diaphragm means having a series of holes located between said annular rib and said inner bead;
- hub means having a first groove and a second groove, said first groove being associated with said annular rib and said second groove being associated with said inner bead, said hub means having an axial bore therethrough, said axial bore being connected to at least one of said series of holes in said diaphragm means through a passageway means;
- backing plate means located adjacent said diaphragm means having a second series of holes therein aligned with said first series of holes in the diaphragm means, said backing plate means having an inner surface which extends into said axial bore of the hub means, said hub means urging said sleeve section against said backing plate means to radially seal the rear chamber from the front chamber;
- fastener means connecting said backing plate means to said hub means through some of said first and second series of holes for urging said annular rib and inner bead of diaphragm means into said first and second grooves, respectively, to sealingly separate the front chamber from the rear chamber;
- and
- control means located in said axial bore of the hub means for allowing free communication between the front chamber and the rear chamber by way of communication through the axial bore through said passageway means, said control means responding to an input force to interrupt communication between the axial bore and the front chamber through said passageway means for allowing a source of fluid under pressure to enter the rear chamber and establish a pressure differential across the diaphragm means and backing plate means and create an output force which is directly transmitted through said inner surface of said backing plate means into an output means.
Dependencies are inferred from the claim text.