Patent ID: 6668774
Filing Date: 2003-12-30
Classification: F01L

Abstract:
Apparatus for determining and measuring changes in relative rotational position, comprising:a) a first element having a first axial well formed therein; b) a second element having a second axial well formed therein, said first and second wells having a common axis, and said first and second elements having a variable relative angular relationship therebetween about said axis; c) splines formed in one of said first and second wells; d) threads formed in the other of said first and second wells; e) a pin disposed in said apparatus and extending into each of said wells and having mating splines on a pin portion extending into said splined well and having mating threads on a pin portion extending into said threaded well; f) a magnet disposed axially disposed on an end of said pin extending into said first well; and g) a Hall-effect sensor disposed adjacent said magnet outside of said first element for providing signals proportional to the axial position of said magnet in said first well, said signals representating the angular position of said first element with respect to said second element.