-
公开(公告)号：US20240410441A1
公开(公告)日：2024-12-12
申请号：US18690349
申请日：2022-12-21
Applicant: Hitachi Astemo, Ltd.
Inventor： Takeru YOKOTA , Gota NAKANO , Mikio YAMASHITA
Abstract: A damping force generation device includes: a first regulation member configured to divide the inside of a tubular member into a first chamber and a second chamber and have a first flow path connected between the first chamber and the second chamber; and a second regulation member having a second flow path provided at least partially parallel to the first flow path and connected between the first chamber and the second chamber and a third flow path branching from the second flow path and connected to a pressure storage portion whose volume is changeable.
-
公开(公告)号：US20230349440A1
公开(公告)日：2023-11-02
申请号：US18027181
申请日：2021-09-21
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA
CPC classification number: F16F9/3481 , F16F9/512 , F16F2222/12
Abstract: A shock absorber includes a first passage through which a working fluid flows from one chamber in a cylinder due to movement of a piston, a second passage which is provided in parallel with the first passage, a disk which is provided in the first passage and generates a damping force, a spool member, having a tubular shape, which is capable of changing a biasing force against the disk by moving in an axial direction, a pilot chamber which is provided in the second passage, located on an inner peripheral side of the spool member, and generates a biasing force against the disk in the spool member, and a closing member which blocks a flow of the working fluid from the pilot chamber to the other chamber and is provided to be movable with respect to the spool member.
-
Patent Agency Ranking
公开(公告)号：US20230220902A1
公开(公告)日：2023-07-13
申请号：US18023823
申请日：2021-09-21
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA
CPC classification number: F16F9/512 , B60G17/08 , B60G13/08 , F16F9/48 , F16F9/348 , B60G2202/24 , B60G2206/41
Abstract: This shock absorber has a first damping force characteristic that is exhibited when a piston speed is from a low-speed region to a high-speed region while a relative position of a piston with respect to a cylinder is in a first range during a low frequency, a second damping force characteristic greater than the first damping force characteristic is exhibited when the piston speed is from the low-speed region to the high-speed region while the relative position is in a second range different from the first range during a low frequency, and a difference in damping force characteristic between during the first range and during the second range is smaller than a difference between the first damping force characteristic and the second damping force characteristic during a high frequency. A second passage is provided with a variable orifice mechanism with a changeable orifice area based on relative position.
-
公开(公告)号：US20220412428A1
公开(公告)日：2022-12-29
申请号：US17620781
申请日：2020-03-25
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA , Takamasa KOTANI
Abstract: Disclosed is a shock absorber including: a cylinder which is filled with a working fluid; a piston which is slidably provided in the cylinder and divides an inside of the cylinder into two chambers; a piston rod which is connected to the piston and extends outside the cylinder; a first passage and a second passage through which the working fluid flows due to movement of the piston; a first damping force generating mechanism which is provided in the first passage and generates a damping force; and a second damping force generating mechanism which is provided in the second passage and generates a damping force. The second damping force generating mechanism includes a sub valve provided on one side of the second passage, and a volume variable mechanism that changes a volume of a volume chamber provided in parallel with the second passage.
-
公开(公告)号：US20220316548A1
公开(公告)日：2022-10-06
申请号：US17615943
申请日：2020-05-26
Applicant: Hitachi Astemo, Ltd.
Inventor： Kosuke KADOKURA , Mikio YAMASHITA
Abstract: A damping force adjustable shock absorber including a compression-side ultra low speed valve that allows passage of an oil liquid from a lower cylinder chamber to an upper cylinder chamber. The compression-side ultra low speed valve is provided in a third passage and arranged in parallel to an extension-side ultra low speed valve. Thus, when a piston is performing a compression stroke and a piston speed falls within an ultra low speed range, oil liquid in the upper cylinder chamber can be expanded, resulting in a differential pressure between the upper cylinder chamber side and the lower cylinder chamber side of the compression-side ultra low speed valve (fifth low speed valve). As a result, when the piston speed falls within the ultra low speed range, the compression-side ultra low speed valve is opened, enabling generation of a damping force having a valve characteristic achieved by the ultra low speed valve.
-
公开(公告)号：US20220163087A1
公开(公告)日：2022-05-26
申请号：US17437459
申请日：2020-01-10
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA , Ryo SHINATA
Abstract: A shock absorber includes a first damping force generation mechanism provided in a first passage, and a second damping force generation mechanism provided in a second passage, in which the second damping force generation mechanism includes a first valve seat formed on a case member having a cylindrical part and a bottom part, a disc valve in which a separable part on an outer circumferential side is separably disposed on a first valve seat, and a second valve seat provided on a side of the disc valve opposite to the first valve seat and configured to support the disc valve on a radial inner side of the separable part, and the second passage includes a piston rod passage part formed by cutting out or penetrating the piston rod, and a chamber passage part which allows communication from the piston rod passage part to a case inner chamber.
-
公开(公告)号：US20210324935A1
公开(公告)日：2021-10-21
申请号：US17270462
申请日：2019-08-05
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA
Abstract: A shock absorber includes a seal member that is slidably in contact with a piston rod, a friction member that is formed of an annular elastic rubber section slidably in contact with the piston rod and an annular base section to which the elastic rubber section is fixed, and an communication path that reduces pressure difference between both sides of the friction member in axial direction. The elastic rubber section is provided with a minimum inner diameter section, a first enlarged diameter section, and a second enlarged diameter section. A force is applied to the piston rod by the friction member such that movement in an outward direction of the cylinder becomes difficult and movement in an inward direction of the cylinder becomes easy.
-
-
-
-
-
-
Search Results
17
records
(took 0.02 seconds)
