DISPLACEMENT DETECTION APPARATUS FOR LINEAR MOTION MECHANISM AND REAR WHEEL STEERING APPARATUS FOR VEHICLE INCLUDING THE SAME

摘要

A displacement detection apparatus for a linear motion mechanism includes a nut member, a rod including elongate grooves elongating in an axial direction of the rod and a through hole, a permanent magnet disposed parallel to the rod, a magnet block made of synthetic resin and including a retaining portion holding the permanent magnet, a pair of leg portions extending from ends of the retaining portion that are spaced apart, and a nut made of metal insert-molded at an intermediate position between the pair of leg portions, and a displacement sensor disposed opposing to the permanent magnet. The pair of leg portions and the nut of the magnet block are disposed in the elongate groove of the rod and the magnet block is fixed to the rod by a bolt screwed to the nut, the bolt penetrating through the through hole extending through the rod.

主权项

1. A displacement detection apparatus for a linear motion mechanism, comprising:
a nut member; a rod that screws through the nut member, the rod including elongate grooves elongating in an axial direction of the rod and a through hole extending between the elongate grooves; the linear motion mechanism converting rotational movement of the nut member into linear movement of the rod; a permanent magnet disposed parallel to the rod; a magnet block made of synthetic resin and including a retaining portion holding the permanent magnet, a pair of leg portions extending from ends of the retaining portion that are spaced apart, and a nut made of metal that is insert-molded at an intermediate position between the pair of leg portions; and a displacement sensor disposed opposing to the permanent magnet and detecting displacement of the rod in the axial direction, wherein the pair of leg portions and the nut of the magnet block are disposed in the elongate groove of the rod and the magnet block is fixed to the rod by a bolt screwed to the nut, the bolt penetrating through the through hole extending through the rod.