ROTATION SENSOR
First Claim
1. A rotation sensor configured to detect rotation of a gear formed from a metallic material, the rotation sensor comprising:
- a magnetism generation unit equipped to one side in a direction in which a tooth projects from its root of the gear;
a plurality of magnetism detection elements arranged in a direction substantially perpendicular to a tooth trace of the gear when being viewed from the magnetism generation unit and configured to send a signal according to a magnetic flux flowing between the gear and the magnetism generation unit;
a detection unit configured to detect rotation of the gear according to the signal of the plurality of magnetism detection elements;
a case accommodating the plurality of magnetism detection elements; and
a movement restriction unit equipped to the case and located on a side of the gear at a place between one of the plurality of magnetism detection elements and an other of the plurality of magnetism detection elements, the movement restriction unit being configured to restrict a magnetic foreign matter, which adheres to the case, from moving in a direction in which the plurality of magnetism detection elements are arranged.
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Accused Products
Abstract
A magnetism detection elements are arranged in an arrangement direction substantially perpendicular to a tooth trace of a gear when viewed from a magnetism generation unit and send a signal according to a magnetic flux flowing between the gear and the magnetism generation unit. A detection unit detects rotation of the gear according to the signal. A case accommodates the magnetism detection elements. A movement restriction unit is equipped to the case and located on the side of the gear at a place between the magnetism detection elements to restrict a magnetic foreign matter, which adheres to the case, from moving in the arrangement direction of the magnetism detection elements.
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Citations
10 Claims
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1. A rotation sensor configured to detect rotation of a gear formed from a metallic material, the rotation sensor comprising:
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a magnetism generation unit equipped to one side in a direction in which a tooth projects from its root of the gear; a plurality of magnetism detection elements arranged in a direction substantially perpendicular to a tooth trace of the gear when being viewed from the magnetism generation unit and configured to send a signal according to a magnetic flux flowing between the gear and the magnetism generation unit; a detection unit configured to detect rotation of the gear according to the signal of the plurality of magnetism detection elements; a case accommodating the plurality of magnetism detection elements; and a movement restriction unit equipped to the case and located on a side of the gear at a place between one of the plurality of magnetism detection elements and an other of the plurality of magnetism detection elements, the movement restriction unit being configured to restrict a magnetic foreign matter, which adheres to the case, from moving in a direction in which the plurality of magnetism detection elements are arranged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification