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公开(公告)号：US20230279920A1
公开(公告)日：2023-09-07
申请号：US18017862
申请日：2021-07-14
申请人： HITACHI ASTEMO, LTD.
发明人： Takamasa KOTANI
CPC分类号： F16F9/341 , F16F9/185 , F16F9/348 , F16F9/512 , F16F2222/12 , F16F2232/08 , F16F2228/066 , B60G13/08
摘要： A shock absorber includes a first passage (92) through which a working fluid flows out from a chamber that is an upstream side to a chamber (23) that is a downstream side due to movement of a piston (21), a first damping force generating mechanism (41) provided in the first passage (92) to generate a damping force, a second passage (182) provided separately from the first passage (92), a second damping force generating mechanism (183) provided in the second passage (182) and opened to generate a damping force when a piston speed is lower than that of the first damping force generating mechanism (41), a third passage (512) provided separately from the second passage (182), a volume variable mechanism (186) provided in the third passage (512), a fourth passage (521) provided separately from the third passage (512), and a relief mechanism (522) provided in the fourth passage (521) and opened after the second damping force generating mechanism (183) is opened.
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公开(公告)号：US20230341023A1
公开(公告)日：2023-10-26
申请号：US18024535
申请日：2021-09-21
申请人： Hitachi Astemo, Ltd.
发明人： Takamasa KOTANI
CPC分类号： F16F9/512 , F16F9/348 , F16F9/19 , F16F2222/12 , F16F2230/02 , F16F2228/04 , F16F2228/066
摘要： A shock absorber includes a first passage provided in a piston and through which a working fluid moves from a chamber on an upstream side to a chamber on a downstream side in a cylinder due to movement of the piston, a first damping force generation mechanism provided in the first passage to generate a damping force, a second passage (141) provided in a piston rod (21), and a fixing member fixed to the piston rod (21) to form the second passage (141), and a second damping force generation mechanism provided in the second passage (141) to generate a damping force, in which a throttle member (161) provided in the second damping force generation mechanism, including a plurality of notch parts (171) at substantially regular intervals in a circumferential direction to form a throttle flow path (76) in the second passage due to the notch parts (171), and formed to have a flow path area of the throttle flow path (76) that is constant regardless of an attachment position thereof in the circumferential direction is further provided.
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公开(公告)号：US20220412428A1
公开(公告)日：2022-12-29
申请号：US17620781
申请日：2020-03-25
申请人： Hitachi Astemo, Ltd.
发明人： Mikio YAMASHITA , Takamasa KOTANI
摘要： 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.
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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
申请人： Hitachi Astemo, Ltd.
发明人： Mikio YAMASHITA , Takamasa KOTANI
CPC分类号： F16F9/3482 , F16F9/5126 , F16F2222/12 , F16F2232/08
摘要： 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
申请人： Hitachi Astemo, Ltd.
发明人： Takamasa KOTANI , Kentaro YAMADA , Mikio YAMASHITA
CPC分类号： F16F9/341 , F16F9/185 , F16F9/348 , F16F9/512 , F16F2222/12 , F16F2232/08 , F16F2228/066 , B60G13/08
摘要： 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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