公开(公告)号：US20230159847A1

公开(公告)日：2023-05-25

申请号：US17919765

申请日：2021-05-06

Applicant: Hitachi Astemo, Ltd.

Inventor： Satoshi ISHII ,  Hitomi TAKAHASHI

IPC: C10M149/14 ,  C08G18/08 ,  C08G18/20 ,  C08G18/76 ,  C08G18/48 ,  C08G18/32 ,  C08G18/66 ,  C10M169/04 ,  C10M107/50 ,  F16F9/53 ,  F16F9/18

CPC classification number: C10M149/14 ,  C08G18/0871 ,  C08G18/2063 ,  C08G18/7614 ,  C08G18/7671 ,  C08G18/4845 ,  C08G18/3206 ,  C08G18/6674 ,  C08G18/3215 ,  C08G18/3212 ,  C08G18/3228 ,  C08G18/6685 ,  C10M169/041 ,  C10M107/50 ,  F16F9/532 ,  F16F9/185 ,  C10M2229/0415 ,  C10M2217/045 ,  C10N2030/60

Abstract: Provided are an electroviscous fluid exhibiting a high ER effect and having sufficient durability, and a cylinder device. An electroviscous fluid of the present invention includes a fluid and polyurethane particles containing metal ions. The polyurethane particles have a phase separation structure of a hard segment and a soft segment, and contain an additive increasing a urethane bond forming the hard segment.

公开(公告)号：US20230057416A1

公开(公告)日：2023-02-23

申请号：US17793557

申请日：2021-01-26

Applicant: Hitachi Astemo, Ltd.

Inventor： Satoshi ISHII ,  Mina AMO

IPC: C10M169/04 ,  C10M149/14 ,  F16F9/53 ,  F16F9/18

Abstract: To provide an electro-rheological fluid and a cylinder device, which each can achieve both high heat resistance and a high ER effect. The electro-rheological fluid (300) of the present invention includes a fluid (30) and polyurethane particles (31) containing metal ion. The polyurethane particles (31) are each composed of polyol and two or more types of isocyanates. A hard segment ratio of the polyurethane particle (31) is 13 to 34%.

公开(公告)号：US20220282179A1

公开(公告)日：2022-09-08

申请号：US17627168

申请日：2020-07-13

Applicant: HITACHI ASTEMO, LTD.

Inventor： Satoshi ISHII

IPC: C10M171/00 ,  C10M171/06 ,  C10M149/14 ,  F16F9/46 ,  F16F9/53 ,  F16F9/32

Abstract: A task of the present invention is to provide an electro-rheological fluid composition and a cylinder device which allow a large ER effect to be obtained, while reducing a current density. An electro-rheological fluid composition (8) of the present invention includes a fluid (32) and a particle (28) having an ion conductivity, the particle (28) having the ion conductivity has a first layer (29) forming a surface of the particle (28) and a second layer (30) forming a part of the particle (28) interior to the first layer (29), and an ion conductivity of the first layer (29) is lower than an ion conductivity of the second layer (30).

公开(公告)号：US20240400931A1

公开(公告)日：2024-12-05

申请号：US18691260

申请日：2022-09-14

Applicant: HITACHI ASTEMO, LTD.

Inventor： Satoshi ISHII ,  Seogchul SHIN ,  Yuichiro YAMAMOTO ,  Hitomi TAKAHASHI

IPC: C10M149/14 ,  C08G18/08 ,  C08G18/32 ,  C08G18/48 ,  C08G18/66 ,  C10N40/08 ,  F16F9/53

Abstract: Provided is an electro-rheological fluid, including: a fluid having an insulating property; and a polyether-based polyurethane particle containing a metal ion, wherein the polyurethane particle contains a chain extender, wherein the metal ion includes at least a Li ion, and wherein a ratio ([Li]/[O]) of a molar concentration ([Li]) of the Li ion to a molar concentration ([O]) of oxygen atoms of ether groups in the polyurethane particles satisfies the following condition: [Ratio of molar concentration ([Li]) of Li ion to molar concentration ([O]) of oxygen of ether groups] [Li]/[O]≥9.0×10−5.

公开(公告)号：US20220106999A1

公开(公告)日：2022-04-07

申请号：US17423212

申请日：2019-08-15

Applicant: HITACHI ASTEMO, LTD.

Inventor： Satoshi ISHII ,  Motohiro HIRAO

IPC: F16F9/53 ,  F16F9/18

Abstract: A cylinder device including: a piston rod having a piston; a first electrode that constitutes an inner cylinder and into which the piston rod is inserted; a second electrode that constitutes an outer cylinder and is provided so as to face an outer peripheral surface of the first electrode; a base shell that houses the first electrode and the second electrode; an electroviscous fluid sealed inside the base shell; and a voltage application unit that applies a voltage between the first electrode and the second electrode, and an outer surface insulation layer is provided on an outer peripheral surface of the second electrode. Thus, it is possible to prevent deposition of particles in a region where the electroviscous fluid sealed in the cylinder device is low in speed, and to suppress deterioration of the damping characteristics of the cylinder device.