公开(公告)号：US20240418541A1

公开(公告)日：2024-12-19

申请号：US18816371

申请日：2024-08-27

Applicant: MINEBEA MITSUMI Inc.

Inventor： Katsunori SAITO ,  Yasuo OSADA ,  Hiroki NEGISHI ,  Norikazu SATO

IPC: G01D5/14 ,  G01D5/04

Abstract: An absolute encoder includes a spindle gear fixed to a motor shaft, a permanent magnet provided on the spindle gear, and a first driven gear having a center axis perpendicular to a center axis of a worm gear portion, and engaging the worm gear portion. The absolute encoder includes a second driving gear provided coaxially with the first driven gear and rotating 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 engaging the second driven gear. The spindle gear includes a magnet holder which is fit onto a tip end of the motor shaft, coaxially with the motor shaft, and a resin gear portion provided with the worm gear portion on an outer side in a radial direction.

公开(公告)号：US20220170731A1

公开(公告)日：2022-06-02

申请号：US17593765

申请日：2020-03-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Katsunori SAITO ,  Yasuo OSADA ,  Hiroki NEGISHI ,  Norikazu SATO

IPC: G01B7/30 ,  G01D5/14 ,  G01D5/16

Abstract: An absolute encoder suitable for size reduction is provided.
The absolute encoder includes a spindle gear (1A) fixed to a motor shaft (201), a permanent magnet (9) provided on the spindle gear (1A), and a first driven gear having a center axis perpendicular to a center axis of a worm gear portion (181), and engaging the wo m gear portion (181). The absolute encoder includes a second driving gear provided coaxially with the first driven gear and rotating 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 engaging the second driven gear. The spindle gear (1A) includes a magnet holder (170) which is fit onto a tip end of the motor shaft (201), coaxially with the motor shaft (201), and a resin gear portion (180) provided with the worm gear portion (181) on an outer side in a radial direction.

公开(公告)号：US20240133670A1

公开(公告)日：2024-04-25

申请号：US18547712

申请日：2022-02-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Yasuo OSADA ,  Katsunori SAITO ,  Takeshi SAKIEDA ,  Norikazu SATO

IPC: G01B7/30

CPC classification number: G01B7/30

Abstract: An influence of use orientation on detection accuracy is reduced. A magnetism detection device includes a magnet (Mr) magnetized, an angle sensor (Sr) as a magnetic sensor configured to detect a magnetic flux from the magnet (Mr), a magnet holder holding the magnet (Mr), and a second layshaft gear shaft. The magnet holder is rotatably supported on the second layshaft gear shaft. The second layshaft gear shaft is made of a magnetic material. An attractive force due to a magnetic force is generated between the magnet (Mr) and the second layshaft gear shaft in a direction of a rotation axis of the magnet holder.

公开(公告)号：US20220196380A1

公开(公告)日：2022-06-23

申请号：US17593638

申请日：2020-03-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Katsunori SAITO ,  Hiroki NEGISHI ,  Yasuo OSADA ,  Norikazu SATO

IPC: G01B7/30

Abstract: An absolute encoder suitable for size reduction is provided.
An absolute encoder includes: a first driving gear configured to rotate according to rotation of a spindle; a first driven gear having a center axis perpendicular to a center axis of the first driving gear and configured to engage with the first driving gear; and a second driving gear provided coaxially with the first driven gear and configured to rotate according to rotation of the first driven gear. The absolute encoder includes a permanent magnet (8) provided on a layshaft gear (5A) having a center axis perpendicular to the center axis of the first driven gear and where a worm wheel portion (52e) is formed to engage with the second driven gear; and a resin sheet (5A1) provided on the layshaft gear (5A) to prevent the permanent magnet (8) from coming out from the layshaft gear (5A) in the axial direction.

公开(公告)号：US20220163317A1

公开(公告)日：2022-05-26

申请号：US17441446

申请日：2020-03-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Katsunori SAITO ,  Yasuo OSADA ,  Hiroki NEGISHI ,  Norikazu SATO

IPC: G01B7/30 ,  G01D5/14 ,  G01D5/16

Abstract: An absolute encoder preferable in being made compact is provided.
The absolute encoder includes a worm gear (101c) that rotates in accordance with rotation of a main spindle, and a worm wheel (102a) of which a central axis is perpendicular to a central axis of the worm gear (101c), the worm wheel engaging with the worm gear (101c). The worm gear (101c) is formed using a first material, and the worm wheel (102a) is formed using a second material different from the first material.

公开(公告)号：US20240230309A9

公开(公告)日：2024-07-11

申请号：US18547712

申请日：2022-02-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Yasuo OSADA ,  Katsunori SAITO ,  Takeshi SAKIEDA ,  Norikazu SATO

IPC: G01B7/30

CPC classification number: G01B7/30

Abstract: An influence of use orientation on detection accuracy is reduced. A magnetism detection device includes a magnet (Mr) magnetized, an angle sensor (Sr) as a magnetic sensor configured to detect a magnetic flux from the magnet (Mr), a magnet holder holding the magnet (Mr), and a second layshaft gear shaft. The magnet holder is rotatably supported on the second layshaft gear shaft. The second layshaft gear shaft is made of a magnetic material. An attractive force due to a magnetic force is generated between the magnet (Mr) and the second layshaft gear shaft in a direction of a rotation axis of the magnet holder.

公开(公告)号：US20240141940A1

公开(公告)日：2024-05-02

申请号：US18547756

申请日：2022-02-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Takeshi SAKIEDA ,  Katsunori SAITO ,  Norikazu SATO ,  Yasuo OSADA

IPC: F16B17/00 ,  G01D5/244

CPC classification number: F16B17/00 ,  G01D5/24442

Abstract: 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.

公开(公告)号：US20220163318A1

公开(公告)日：2022-05-26

申请号：US17593640

申请日：2020-03-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Yasuo OSADA ,  Hiroki NEGISHI ,  Katsunori SAITO ,  Norikazu SATO

IPC: G01B7/30 ,  G01D5/14 ,  G01D5/16

Abstract: An absolute encoder preferable in being made compact is provided.
The absolute encoder includes a first drive gear, a first permanent magnet, a first angle sensor, and a first driven gear of a central axis that is perpendicular to a central axis of the first drive gear, the first driven gear engaging with the first drive gear. The absolute encoder includes a second drive gear coaxially provided with the first driven gear, the second drive gear being configured to rotate in accordance with rotation of the first driven gear. The absolute encoder includes a second driven gear of which a central axis is perpendicular to the central axis of the first driven gear, the second driven gear engaging with the second drive gear. The absolute encoder includes a second permanent magnet provided on a top end side of the second driven gear. The absolute encoder includes a second angle sensor configured to detect a rotation angle of the second driven gear, in accordance with a change in magnetic flux generated from the second permanent magnet. A reduction ratio between the first drive gear (worm gear (101c)) and the first driven gear (worm wheel (102a)) is set to a value for mitigating an effect of backlash between the first drive gear and the first driven gear, the backlash resulting in an error in the rotation angle of the second driven gear.

公开(公告)号：US20220155051A1

公开(公告)日：2022-05-19

申请号：US17593858

申请日：2020-03-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Norikazu SATO ,  Kaoru NISHIGUCHI ,  Hiroyuki HISHIYAMA ,  Yujin ISHI

IPC: G01B7/30 ,  G01D5/14 ,  G01D5/16

Abstract: An absolute encoder preferable in being made compact is provided.
The absolute encoder includes a worm gear, a permanent magnet (19) provided on a top end side of the worm gear, and magnetic sensors. In the permanent magnet (19), a given first polar portion (N) among first polar portions each having a first polarity and a given second polar portion (S) among second polar portions each having a second polarity different from the first polarity are formed adjacent to each other, when viewed from an end surface of the permanent magnet (19) in an axial direction thereof. A given first polar portion (N) and a given second polar portion (S) are formed to be adjacent in a radial direction, with a radial middle portion of the permanent magnet (19) that is a boundary. A given first polar portion (N) and a given second polar portion (S) are formed to be adjacent in an axial direction, with an axial middle portion of the permanent magnet (19) that is a boundary.