Passive pick-up device for monitoring the state of the tire of a vehicle wheel and measuring the rotation characteristics of the wheel
US5231391A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1991 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Nov 19, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2326/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for monitoring the state of the tire of a vehicle wheel and for measuring the rotation characteristics of the wheel is described herein. The device includes a rotating encoder element constituted by a multipolar magnetic ring, whereby magnetic segments of different polarity are distributed circumferentially in a regular and alternating manner. The device further includes a transmitter coil mounted coaxially with the multipolar ring, a fixed pick-up element constituted by an induction coil enclosed in a U-shaped section of an annular flux focusing element arranged coaxially with the multipolar magnetic ring. The device is energized by an alternative electric current flowing through the transmitting coil which generates a magnetic field superimposed on the magnetic field created by the multipolar magnetic ring, wherein the pick-up element delivers a signal relating to the rotation characteristics of the wheel and the state of the tire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.