Shaft support structure, magnetism detection device, and absolute encoder
Provided is a shaft support structure capable of improving mounting accuracy of a shaft to be press-fitted. The shaft support structure includes a main shaft adapter and a main shaft as a supporting member including a press-fitting portion for press-fitting the main shaft adapter from one end portion. The main shaft adapter has a tapered surface portion having a diameter of one end portion smaller than a diameter of a peripheral surface. The tapered surface portion is subjected to curved surface processing at a connecting portion with the peripheral surface.
1 . A magnetism detection device of an absolute encoder, comprising:
a magnet magnetized;
a magnetic sensor configured to detect a magnetic flux from the magnet;
a magnet holder holding the magnet;
a shaft adapter rotatably supporting the magnet; and
a shaft having a hole for press-fitting the shaft adapter from one end,
wherein the shaft comprises:
a region having a predetermined length in an axial direction from one end of a peripheral surface to be press-fitted into the hole; and
a tapered surface portion having a diameter of the one end smaller than a diameter of a peripheral surface, and
the tapered surface portion is subjected to curved surface processing at a connecting portion with the peripheral surface,
wherein the shaft has a through hole passing through from the one end to the other end,
the through hole has a hole diameter in a region having a predetermined length in an axial direction from a side of the one end larger than a hole diameter at a side of the other end, and
the magnet holder having a tubular portion, a press-fitting portion in the form of a cylindrical surface which has a shape allowing the shaft adapter to be press-fitted and fixed.