Importance

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Abstract

A rotational angle detecting device includes a rotary shaft 1 having an annular projection 1c formed therein so as to extend radially outwardly therefrom, and a housing 2 rotatably supporting the rotary shaft 1. A plurality of rolling contact bearings 6 each having inner and outer races are mounted on the rotary shaft 1 under a pre-loaded condition so as to sandwich the annular projection 1 c between the respective inner races of the rolling contact bearings 6. The assembly is rotatably received inside the housing 2 to permit the rotary shaft 1 to be rotatable about a longitudinal axis thereof. A resistor element 12 is disposed on an inner surface of a housing lid 3 in concentric relation to the longitudinal axis of the rotary shaft 1. An electroconductive brush 5 is secured to an end face of the rotary shaft 1 for rotation together with the rotary shaft 1 and held in sliding contact with the resistor element 12.

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First Claim