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Transmission shift rail position sensor

  • US 8,258,779 B2
  • Filed: 11/26/2008
  • Issued: 09/04/2012
  • Est. Priority Date: 11/26/2008
  • Status: Active Grant
First Claim
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1. A rail position sensing system for sensing a position of shift rail which is slidable in a rail bore in a housing, the rail position sensing system, comprising:

  • a groove formed in the shift rail, the groove including a curved bottom surface, a first ramp surface extending from one side of the bottom surface to an outer peripheral surface of the shift rail, and a second ramp surface extending from a second side of the bottom surface to an outer peripheral surface of the shift rail;

    the housing including a sensor bore, the sensor bore having an axis which intersects the rail;

    a sensor housing mounted in the sensor bore, the sensor housing having an end facing towards the shift rail and spaced apart therefrom;

    a magnet mounted inside the sensor housing near said end, the magnet generating a magnetic field, a portion of the rail which includes the groove extending into the magnetic field, movement of the rail producing changes in said magnetic field; and

    a Hall effect sensor mounted inside the sensor housing near said end so that the Hall effect sensor detects changes in said magnetic field through a range of positions of the shift rail.

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