Patent ID: 7000750

Claim:
A hub lock system, comprising: a knuckle adapted to be fixed to a vehicle; a wheel hub rotatably supported by said knuckle, said wheel hub including a bore extending therethrough defining interior splines; an axle shaft extending through said bore of said wheel hub, said axle shaft including exterior splines thereon; and a vacuum locking hub assembly received in said bore in said wheel hub and including: a body member having an annular base portion secured to an inner drive gear, said inner drive gear including internal splines in engagement with said external splines of said axle shaft and a plurality of exterior clutch teeth, a clutch ring surrounding said inner drive gear and including internal clutch teeth, said clutch ring being slidable relative to said inner drive gear for moving said internal clutch teeth into and out of engagement with said exterior clutch teeth of said inner drive gear; a piston received in said body member and disposed against said clutch ring for causing driving movement of said clutch ring; a diaphragm attached to said body member by a retainer, said diaphragm acting against said piston for driving said piston, wherein said inner drive gear, said clutch ring, said piston and said diaphragm are all held together by said body member; a cap member separate from said vacuum locking hub assembly and secured to an end face of said wheel hub for securing said vacuum locking hub assembly within said bore of said wheel hub.