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公开(公告)号：US20240376956A1
公开(公告)日：2024-11-14
申请号：US18691993
申请日：2022-09-09
Applicant: Hitachi Astemo, Ltd.
Inventor： Kosuke KADOKURA
Abstract: When a pilot valve is actuated, and an actuating rod to which a valve body is fixed moves in an axial direction, hydraulic liquid of an equivalent amount to a volume of a portion of the actuating rod which enters and retracts from a valve body back-pressure chamber moves between a pilot chamber and the valve body back-pressure chamber through an orifice (volume compensation). At this time, the damping that is generated by the hydraulic liquid passing through the orifice acts on the valve body, which restrains self-induced vibrations (chattering) of the pilot valve.
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公开(公告)号：US20230070735A1
公开(公告)日：2023-03-09
申请号：US17798419
申请日：2021-02-09
Applicant: Hitachi Astemo, Ltd.
Inventor： Kosuke KADOKURA
Abstract: A pin portion in which an introduction orifice leading to a back-pressure chamber is formed is disposed along inner peripheries of a main body, a main valve, and a pilot casing. A nut disposed on the pin portion is rotated relative to the pin portion to fasten the main body, the main valve, and the pilot casing together. This eliminates the necessity of machining a tool engagement portion in the pin portion and represses an increase in man-hours.
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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.
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公开(公告)号：US20220316547A1
公开(公告)日：2022-10-06
申请号：US17615928
申请日：2020-05-26
Applicant: Hitachi Astemo, Ltd.
Inventor： Tomohiko IIDA , Kosuke KADOKURA , Kento MONJI , Shunsuke MORI
Abstract: When a damping force adjustable shock absorber operates in a soft mode, a piston is performing a compression stroke, and a piston speed falls within an ultra low speed range, communication between an upper cylinder chamber and a reservoir is interrupted by an ultra low speed valve provided in a pilot passage. The interruption of communication enables expansion of an oil liquid in the upper cylinder chamber when the piston is performing the compression stroke and the piston speed falls within the ultra low speed range. A differential pressure is generated between an upper cylinder chamber side and a lower cylinder chamber side of a compression-side ultra 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, and a damping force having a valve characteristic achieved by the ultra low speed valve can be generated.
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