The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 07, 1995
Filed:
Jun. 03, 1992
Erland K Persson, Golden Valley, MN (US);
Paul K Webber, Rochester Hills, MI (US);
David L Perry, Rochester Hills, MI (US);
TRW Inc., Lyndhurst, OH (US);
Abstract
A torque sensor for use in a power assist steering system for sensing the applied steering torque between an input shaft and an output shaft wherein said shafts are coaxially aligned with each other and rotatable relative to each other about a common axis. The sensor includes a non-planar rotary input transformer having a stationary primary winding and a rotary secondary winding, both mounted coaxially about a common axis. A transmitter is mounted to the input shaft for rotation therewith and carries, on one axially directed face, a coil set of series connected coils arranged in an annular array about the common axis. A receiver is axially spaced from the transmitter and is mounted on the output shaft for rotation therewith about the common axis. The receiver carries, on an opposing axially directed face, first and second sets of series connected coils each arranged in an annular array about the common axis and with the coil sets being electrically displaced by 90.degree.. First and second non-planar rotary output transformers are provided respectively having first and second axially spaced primary windings coaxially surrounding the axis. The first and second output transformers respectively include first and second stationary secondary windings spaced radially outward from and coaxially surrounding the first and second rotary primary windings.