公开(公告)号：US11561235B2

公开(公告)日：2023-01-24

申请号：US16690650

申请日：2019-11-21

Applicant: ROLLS-ROYCE PLC

Inventor： Robert N Shepherd ,  Kevin E Gapper

IPC: G01P3/48 ,  G01P1/02 ,  G01P3/488 ,  F01D17/06

Abstract: A system for monitoring the axial position of a rotating shaft includes a phonic wheel mounted coaxially to the shaft for rotation with a circumferential row of teeth. The system includes a sensor configured to detect the passage of the teeth by generating an alternating measurement signal. First and second portions of the teeth alternate around the row and contribute respective first and second components to the alternating measurement signal. The first portion of teeth vary in height in an axial direction of the wheel such that the relative height of the first and second portions varies with axial distance across the phonic wheel, and the sensor is positioned relative to the phonic wheel such that axial displacement of the shaft causes the signal to vary the first component's amplitude relative to the second component's amplitude due to the height variation, to monitor the axial position of the shaft.