Patent ID: 6664780
Filing Date: 2003-12-16
Classification: G01P

Abstract:
A tone ring assembly for use on a rotatable machine part, said assembly including a rotatable tone ring able to generate a varying voltage output when rotated at varying speeds, with a fixed magnetic sensor assembly disposed in facing relation and closely spaced from said tone ring, said rotatable machine part including an axially inner portion and an axially outer portion running in a surrounding bearing unit, said tone ring comprising an axially extending main body portion with a plurality of areas able to generate a voltage output upon rotation, a retainer having at least one radial flange to prevent substantial axial movement of said tone ring, said tone ring including plural axially extending ribs of reduced diameter on its inner diameter for snugly engaging said shaft, and having axial spaces of enlarged diameter between said ribs, thereby affording passages for oil to pass axially through said tone ring assembly, and wherein said at least one of said axially extending ribs of reduced diameter includes a first portion and a second portion, said second portion being of slightly further reduced diameter so as to initially engage said shaft only and said first portion thereafter being adapted upon contact with oil and grease more into snug engagement with said shaft.