Invention Grant
- Patent Title: Damping force control type shock absorber
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Application No.: US14910823Application Date: 2014-08-11
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Publication No.: US09810281B2Publication Date: 2017-11-07
- Inventor: Shunsuke Mori , Fumiyuki Yamaoka , Mikio Yamashita
- Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
- Applicant Address: JP Ibaraki
- Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
- Current Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
- Current Assignee Address: JP Ibaraki
- Agency: Wenderoth, Lind & Ponack, L.L.P.
- Priority: JP2013/166592 20130809
- International Application: PCT/JP2014/071204 WO 20140811
- International Announcement: WO2015/020227 WO 20150212
- Main IPC: F16F9/46
- IPC: F16F9/46

Abstract:
PROBLEMProvided is a damping force control type shock absorber capable of obtaining an appropriate damping force even in the event of a failure independently of the stoke of a valving element of a solenoid valve.MEANS FOR SOLVINGA piston 5 having a piston rod 6 connected thereto is fitted in a cylinder 2 having hydraulic oil sealed therein, and a flow of hydraulic oil induced by movement of the piston 5 is controlled by a damping force generating mechanism 26 to generate a damping force. In the damping force generating mechanism 26, damping force is generated by a pilot-type main valve 27 and a normally-open pilot valve 28 which is a solenoid valve, and the damping force is adjusted by energization of a coil 37. A fail-safe valve 100 is provided downstream of the pilot valve 28. During normal operations, the fail-safe valve 100 opens the flow path through excitation of the coil 37 of the pilot valve 28. In the event of a failure, due to loss of excitation, the fail-safe valve 100 restricts the flow path to generate an appropriate damping force in place of the pilot valve 28, which has become inoperable.
Public/Granted literature
- US20160195152A1 DAMPING FORCE CONTROL TYPE SHOCK ABSORBER Public/Granted day:2016-07-07
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