公开(公告)号：US10690514B2

公开(公告)日：2020-06-23

申请号：US16605900

申请日：2018-04-11

Applicant: NSK LTD.

Inventor： Masaki Kuwahara ,  Kazuhiro Ohira

IPC: G01D5/14 ,  G01D5/244 ,  G01B7/30

Abstract: A rotation angle detection device includes: a rotating body having magnetic tracks on which magnetic pole pairs are arranged at even intervals in concentric ring shapes; magnetic sensors each configured to detect a magnetic field of a corresponding one of the magnetic tracks and output a sine signal and a cosine signal; storage configured to store magnetic sensor correction information; a correction calculator configured to correct the sine signal and the cosine signal based on the magnetic sensor correction information; a phase detector configured to calculate a phase of the corrected sine signal and the corrected cosine signal; a phase difference detector configured to calculate a phase difference between a plurality of the phases; and an angle calculator configured to convert the phase difference into an absolute angle.

公开(公告)号：US10035535B2

公开(公告)日：2018-07-31

申请号：US15578064

申请日：2016-06-24

Applicant: NSK Ltd.

Inventor： Kazuhiro Ohira ,  Masaki Kuwahara ,  Sumio Sugita ,  Shigeyuki Uematsu

IPC: G01L3/00 ,  B62D5/04 ,  G01B7/30 ,  B62D15/02 ,  G01L3/10 ,  G01D5/244

CPC classification number: B62D5/0406 ,  B62D5/04 ,  B62D15/02 ,  G01B7/30 ,  G01D5/244 ,  G01D5/24461 ,  G01D5/2451 ,  G01L3/08 ,  G01L3/10 ,  G01L3/104 ,  G01L3/105

Abstract: There are provided a relative angle detection device suitable for expanding a torque detection range, and a torque sensor, an electric power steering device and a vehicle including the relative angle detection device. Based on a first sine signal representing sin(θos+Δθ) and a first cosine signal representing cos(θos+Δθ) in accordance with a rotation angle(θis) of a first multipolar ring magnet that synchronously rotates with an input shaft from between the coaxially arranged input shaft and an output shaft, and based on a second sine signal representing sin θos and a second cosine signal representing cos θos in accordance with a rotation angle(θos) of a second multipolar ring magnet that synchronously rotates with the output shaft, sin Δθ and cos Δθ are calculated in accordance with a relative angle(Δθ) between the input shaft and the output shaft, and from Δθ=arctan(sin Δθ/cos Δθ), the relative angle(Δθ) is calculated.

公开(公告)号：USD1031548S1

公开(公告)日：2024-06-18

申请号：US29791741

申请日：2022-02-03

Applicant: NSK Ltd.

Designer： Kazuhiro Ohira

Abstract: FIG. 1 is a front, top and right-side perspective view of showing my new design;
FIG. 2 is a rear, bottom and left-side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left-side elevational view thereof;
FIG. 6 is a right-side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.

公开(公告)号：US09716421B2

公开(公告)日：2017-07-25

申请号：US15105129

申请日：2015-01-14

Applicant: NSK LTD.

Inventor： Kazuhiro Ohira ,  Masaki Kuwahara

IPC: G01D5/20 ,  H02K11/225 ,  H02K24/00 ,  H02K37/04

CPC classification number: H02K11/225 ,  G01D5/2046 ,  H02K24/00 ,  H02K37/04

Abstract: A resolver device includes a stator core and a rotor core supported so as to be freely rotatable with respect to the stator core and configured such that a reluctance component in a gap between the rotor core and the stator core changes in accordance with a relative angle position to the stator core. The stator core includes stator main poles and stator interpoles.

公开(公告)号：US09574611B2

公开(公告)日：2017-02-21

申请号：US14888352

申请日：2013-12-11

Applicant: NSK LTD.

Inventor： Kazuhiro Ohira ,  Katsuaki Denpou

IPC: F16C33/80 ,  F16C41/00 ,  F16C33/78 ,  F16C19/06

CPC classification number: F16C41/007 ,  F16C19/06 ,  F16C33/78 ,  F16C33/7856 ,  F16C33/7886 ,  F16C33/80

Abstract: A sensor (20) arranged in a deep groove ball bearing (10) includes an encoder (22) attached at an inner ring (1) to be rotatable integrally with the inner ring (1), and a magnetism detecting element (24) attached at an outer ring (2) via a sensor housing (26) to face the encoder (22) with a sensor gap. Then, the magnetism detecting element (24) is capable of measuring a rotating state of the encoder (22) rotating in the rotating state identical to that of the inner ring (1) in conjunction with a rotation of the inner ring (1). The deep groove ball bearing (10) includes a foreign material entering prevention portion that prevents a foreign material from entering the inside of the bearing from a gap between the inner ring (1) and the sensor housing (26). The size of the gap between the inner ring (1) and the sensor housing (26) is substantially identical to the sensor gap between the magnetism detecting element (24) and the encoder (22), and the gap configures non-contact seal and functions as the foreign material entering prevention portion.

Abstract translation: 布置在深沟球轴承（10）中的传感器（20）包括安装在内环（1）上以与内圈（1）一体旋转的编码器（22），以及安装有磁性检测元件（24）的编码器 在外环（2）处经由传感器外壳（26）与传感器间隙面对编码器（22）。 然后，磁性检测元件24能够与内圈（1）的旋转一起测量与内圈（1）的旋转状态相同的旋转状态旋转的编码器（22）的旋转状态。 深沟球轴承（10）包括防止异物从内圈（1）和传感器壳体（26）之间的间隙进入轴承内部的异物进入防止部。 内环（1）和传感器外壳（26）之间的间隙大小基本上与磁检测元件（24）和编码器（22）之间的传感器间隙相同，并且间隙构成非接触式密封和 作为异物进入防止部。