US 12,104,928 B2
Absolute encoder
Katsunori Saito, Kanagawa (JP); Yasuo Osada, Saitama (JP); Hiroki Negishi, Tokyo (JP); and Norikazu Sato, Saitama (JP)
Assigned to MINEBEA MITSUMI Inc., Nagano (JP)
Appl. No. 17/593,765
Filed by MINEBEA MITSUMI Inc., Nagano (JP)
PCT Filed Mar. 24, 2020, PCT No. PCT/JP2020/013053
§ 371(c)(1), (2) Date Sep. 24, 2021,
PCT Pub. No. WO2020/196533, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-064970 (JP), filed on Mar. 28, 2019.
Prior Publication US 2022/0170731 A1, Jun. 2, 2022
Int. Cl. G01D 5/14 (2006.01); G01D 5/04 (2006.01)
CPC G01D 5/145 (2013.01) [G01D 5/04 (2013.01); G01D 2205/26 (2021.05); G01D 2205/28 (2021.05)] 4 Claims
OG exemplary drawing
 
1. An absolute encoder comprising:
a first driving gear, fixed to a spindle, coaxially with the spindle, and configured to rotate according to a rotation of the spindle;
a first magnet provided on the first driving gear;
a first driven gear, having a center axis perpendicular to a center axis of the first driving gear, and configured to engage the first driving gear;
a second driving gear, provided coaxially with the first driven gear, and configured to rotate according to a rotation of the first driven gear; and
a second driven gear, having a center axis perpendicular to the center axis of the first driven gear, and configured to engage the second driving gear,
wherein the first driving gear includes:
a cylindrical portion fit onto a tip end of the spindle, coaxially with the spindle, and
an annular portion having a teeth portion, configured to engage the first driven gear, and provided on an outer side thereof in a radial direction, and
wherein the annular portion is provided coaxially with the spindle and adjacent to the cylindrical portion,
the cylindrical portion is a separate element from the annular portion,
an inner peripheral surface of the annular portion is fit onto an outer peripheral surface of the spindle,
the cylindrical portion and the spindle contact each other at a first contact portion,
the annular portion and the spindle contact each other at a second contact portion,
the first contact portion and the second contact portion are arranged along a plane parallel to a radial direction of the first driving gear, perpendicular to an axial direction of the spindle, and
the inner peripheral surface of the annular portion includes a surface portion opposing the outer peripheral surface of the cylindrical portion with a gap formed therebetween.