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公开(公告)号：US20250128564A1
公开(公告)日：2025-04-24
申请号：US18692593
申请日：2022-09-20
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA
IPC: B60G17/08 , B60G17/0165
Abstract: A suspension system includes: a variable damper configured to use a damping force variable actuator to adjust communication of working fluid generated in a passage by a relative movement between a vehicle body and a wheel, to thereby adjust a damping force over a range of a soft characteristic to a hard characteristic; and a controller configured to control the damping force variable actuator. The variable damper further includes a frequency response unit configured to reduce the damping force for vibration at a specific frequency. The controller is configured to increase a change rate from a soft side to a hard side at a time of controlling the damping force to reach a target damping force when a frequency of the relative movement between the vehicle body and the wheel is lower than a first frequency set to the frequency response unit.
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公开(公告)号：US20220186807A1
公开(公告)日：2022-06-16
申请号：US17432249
申请日：2020-01-15
Applicant: HITACHI ASTEMO, LTD.
Inventor： Mikio YAMASHITA , Ryo SHINATA
Abstract: A first damping force generation mechanism provided in a first passage formed in a piston to generate a damping force, and a second damping force generation mechanism provided in an annular valve seat member disposed in one of chambers and provided in a second passage in parallel with the first passage to generate a damping force, in which the second damping force generation mechanism includes a first sub-valve provided on one side of the second passage formed in the valve seat member and a second sub-valve (provided on the other side thereof, and a bottomed cylindrical cap member having an outer cylindrical part and a bottom part, and the cap member includes an inner cylindrical part into which the piston rod is able to be inserted formed on an inner circumferential side of the bottom part and houses at least a part of the second damping force generation mechanism.
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公开(公告)号：US20220074461A1
公开(公告)日：2022-03-10
申请号：US17417400
申请日：2019-11-12
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA
Abstract: A valve seat member is provided in a cap member. A first sub valve is provided in another side chamber. A second sub valve is provided in a cap chamber formed between a bottom portion of the cap member and the valve seat member. In a second passage, an orifice is disposed on an upstream side or a downstream side from the first sub valve in flow by which the first sub valve is opened. In a region in which a piston speed is low, a valve of a second damping force generating mechanism is opened in a state in which a valve of a first damping force generating mechanism is closed. In a speed region in which the piston speed is higher than in another region, the valve of the first damping force generating mechanism and the valve of the second damping force generating mechanism are both opened.
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公开(公告)号：US20240344586A1
公开(公告)日：2024-10-17
申请号：US18682969
申请日：2022-06-29
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA
CPC classification number: F16F9/5126 , F16F9/348
Abstract: The shock absorber includes a cylinder, a piston, a first passage through which a flow of the working fluid occurs due to movement of the piston in one direction, a first damping valve providing resistance to a flow of the working fluid from a chamber on an upstream side to a chamber on a downstream side of the first passage, a back pressure chamber causing an internal pressure to act on the first damping valve in a valve closing direction, a bottomed cylindrical case member having an opening at one end, the first damping valve disposed in the opening, and the back pressure chamber formed therein, a second passage introducing the working fluid into the back pressure chamber from the chamber on the upstream side, a second damping valve seated on a first seat part formed on a bottom portion of the case member.
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公开(公告)号：US20210348668A1
公开(公告)日：2021-11-11
申请号：US17272690
申请日：2019-10-31
Applicant: Hitachi Astemo, Ltd.
Inventor： Reiji NAKAGAWA , Mikio YAMASHITA
Abstract: This shock absorber includes: a friction member including an annular elastic rubber portion and an annular base portion (to which the elastic rubber portion is fixed; and a communication path that decreases a pressure difference between both sides of the friction member. The base portion includes an annular disk portion. The elastic rubber portion includes a minimum inner diameter portion on an inner peripheral side and includes an inner peripheral connection portion connected to an inner peripheral portion of the annular disk portion. A protrusion suppression structure portion that suppresses protruding of an inner peripheral surface formed from the minimum inner diameter portion toward the inner peripheral connection portion is provided at least partially in a circumferential direction between the inner peripheral connection portion and the minimum inner diameter portion of the elastic rubber portion.
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Patent Agency Ranking
公开(公告)号：US20250137511A1
公开(公告)日：2025-05-01
申请号：US18683087
申请日：2022-06-27
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA
Abstract: This shock absorber includes a cylinder in which a working fluid is sealed, a piston fitted in the cylinder to be slidable and partitioning the inside of the cylinder into two chambers, a passage through which the working fluid flows from one chamber in the cylinder due to movement of the piston, a bendable plate-shaped valve member provided in the passage and whose inner circumferential side is supported by a support member only on one surface side without being clamped from both surface sides, and a movement restriction member restricting movement of the valve member. The support member is configured such that a spring constant of a second movement range in which the valve member moves to the movement restriction member side beyond a first movement range is larger than a spring constant of the first movement range in which the valve member moves to the movement restriction member side.
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公开(公告)号：US20240376957A1
公开(公告)日：2024-11-14
申请号：US18690354
申请日：2022-09-13
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA , Takamasa KOTANI , Seiryo KONAKAI
Abstract: A damping force generation mechanism (190) includes: a biasing force generation member (91) that causes a first damping force generation member (203) having a bottomed tubular shape and disposed on a side of an opening (145) to generate a biasing force in a valve closing direction; a regulation member (18) that is provided on a side of a bottom portion (92) of the biasing force generation member (91) and includes passages (43, 44) formed to establish communication between a one-side chamber and an other-side chamber (20); a frequency sensitive mechanism (191) that is provided between the regulation member (18) and the first damping force generation member (203), is provided with a movable portion (171) in a movable manner, and makes the biasing force variable; and a seat forming member (205) that is provided at the biasing force generation member (91) on the side of the opening (145) and includes a seat (233) formed therein for the first damping force generation member (203) to be seated.
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公开(公告)号：US20230287954A1
公开(公告)日：2023-09-14
申请号：US18017864
申请日：2021-07-14
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA , Takamasa KOTANI
CPC classification number: F16F9/3482 , F16F9/5126 , F16F2222/12 , F16F2232/08
Abstract: This shock absorber includes a first damping force generation mechanism (41) provided in a passage (92) of a piston (21), a second damping force generation mechanism (183) provided in a piston rod (25), and a fluid storage mechanism (190) provided in the piston rod (25). The fluid storage mechanism (190) includes a flexible disc (100) which deforms before the second damping force generation mechanism (183) opens, and a plate-shaped biasing member (116, 117) which has a hole portion (415) between an inner circumferential end portion and an outer circumferential end portion, and in which the inner circumferential end portion is formed so that the piston rod (25) can be inserted therein.
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公开(公告)号：US20230272835A1
公开(公告)日：2023-08-31
申请号：US18017861
申请日：2021-07-14
Applicant: Hitachi Astemo, Ltd.
Inventor： Takamasa KOTANI , Kentaro YAMADA , Mikio YAMASHITA
CPC classification number: F16F9/341 , F16F9/185 , F16F9/348 , F16F9/512 , F16F2222/12 , F16F2232/08 , F16F2228/066 , B60G13/08
Abstract: This shock absorber includes a first damping force generation mechanism provided in a passage of a piston, and a second damping force generation mechanism provided in a piston rod. The second damping force generation mechanism includes a valve seat member, a sub-valve provided in the valve seat member, and a cap member covering one end side of the second damping force generation mechanism and at least a part of an outer circumference of the valve seat member. A communication passage is formed on one end side of the cap member. A biasing member provided so that one end surface side is in contact with an outer circumferential side of the cap member with respect to the communication passage, and a bendable flexible disc provided so that the other end surface side of the biasing member is in contact therewith.
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公开(公告)号：US20220018417A1
公开(公告)日：2022-01-20
申请号：US17441893
申请日：2020-02-12
Applicant: Hitachi Astemo, Ltd.
Inventor： Mikio YAMASHITA
Abstract: A damping force adjustable shock absorber includes a flow path (an oil passage of a piston) in which a flow of hydraulic fluid is generated due to a movement of a piston rod, and a damping force adjustment valve provided in the flow path and configured to be subjected to an adjustment of an opening/closing operation by a solenoid. A frequency adaptive mechanism is provided in the flow path in series with the damping force adjustment valve. The frequency adaptive mechanism is configured to reduce a damping force for a high-frequency vibration. The frequency adaptive mechanism includes a second valve mechanism (a compression-side damping force generation valve and an extension-side damping force generation valve) configured to apply a resistance force to a flow of the hydraulic fluid from an upstream-side chamber (an upper-portion chamber or a lower-portion chamber) to a downstream-side chamber (the lower-portion chamber or the upper-portion chamber).
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