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Steering torque detecting device

  • US 4,838,074 A
  • Filed: 04/04/1988
  • Issued: 06/13/1989
  • Est. Priority Date: 04/06/1987
  • Status: Expired due to Fees
First Claim
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1. A steering torque detecting device which comprises:

  • a steering shaft consisting of an input shaft and an output shaft,a torsion bar connecting said input shaft with said output shaft,a printed wiring board of a circular plate form which is provided at one surface thereof with a resistance layer and an output electrode radially spaced apart from said resistance layer, said resistance layer and said output electrode constituting a potentiometer, and which is attached to one of said input shaft and said output shaft,a plurality of slip rings which are fixed to one of said shafts and connected to electrodes formed at ends of said resistance layer and said output electrode,a plurality of brushes in contact with said slip rings to receive detection signals, anda slider mounted on a second of said input shaft and said output shaft and having a portion extending in the radial direction of said circular printed wiring board so as to have contacting areas for contacting said resistance layer and said output electrode wherein a zero point electrode having a portion extending in the circumferential direction to have a zero point contact part with a small width at its one end and a paired electrode formed radially apart from said zero point electrode are provided in the same surface as said resistance layer and said output electrode on said printed wiring board.

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