Torque sensing apparatus for measuring relative torque between two shafts
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United States of America Patent
Stats
-
Mar 9, 2004
Grant Date -
Feb 27, 2003
app pub date -
Mar 14, 2002
filing date -
Aug 27, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A torque sensing device adapted for use in an electric power assisted steering system is provided. In one embodiment, the device comprises first and second shafts interconnected by a torsion bar, a bushing disposed about the torsion bar and frictionally engaged with one of the shafts, and a stator/sensing device assembly. One of the shafts defines a projection while the other shaft defines a recess. The recess receives the projection and allows a limited degree or rotational movement of the projection within the recess. A plurality of magnets is disposed circumferentially about bushing. As a result of the frictional engagement with one of the shafts, the bushing rotates independently of the stator assembly. A sensing device, such as a Hall effect sensor, is positioned within a clearance between first and second poles within the stator and detects relative rotation of the bushing, which is indicative of rotation of the frictionally engaged shaft, within the stator. The sensing device is adapted to transmit a signal based on this measurement that can be utilized by a control module of an EPAS system to effect steering changes.
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