Patent ID: 11874109
Assignee: DENSO CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  F | IPC G

Claim 0:
1. A rotation angle detection device that detects a rotation angle of a valve body, comprising:
a shaft connected to the valve body;
a gear that is connected to the shaft and rotates the shaft to rotate the valve body;
a magnetic field generator that is arranged on a gear side and generates a magnetic field;
a fixing metal member that is made of a magnetic material, is provided at a position covering at least a part of the magnetic field generator, and fixes the gear to the shaft; and
a magnetic detection element that is arranged on an extension of the shaft and detects magnetic flux density of the magnetic field that rotates together with the gear, wherein
the fixing metal member has three or more protrusions that protrude in a radial direction of a circle centered on the shaft,
the three or more protrusions are plane-symmetrically arranged with respect to a plane of symmetry of a magnetic force line generated by the magnetic field generator, and
the three or more protrusions are unevenly arranged on a circumference centered on a center of rotation of the gear.