Patent ID: 10295372

Abstract:
A magnetic rotation detection apparatus which is capable of suppressing occurrence of assembly failure of components. A gear position sensor 10 is provided with a sensor unit 12 including a Hall element 20, a magnet shaft 11 including a magnet 17, a case 14 housing the sensor unit 12 and the magnet shaft 11, and an inner O-ring 24 sealing a gap between the sensor unit 12 and the case 14. The case 14 includes a metal bearing 19 to support the magnet shaft 11, and the magnet shaft 11 includes a molded portion 18 to fix the magnet 17. A thrust plate 22 is arranged between the molded portion 18 and a base plate 21 (circuit board) of the sensor unit 12, and a spring mechanism 26 is arranged to bias the molded portion 18 to the thrust plate 22. A minute gap is present between the metal bearing 19 and the magnet shaft 11.