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1. (WO2013122251) DAMPING FORCE CONTROL VALVE AND SHOCK ABSORBER

Pub. No.:    WO/2013/122251    International Application No.:    PCT/JP2013/053845
Publication Date: Fri Aug 23 01:59:59 CEST 2013 International Filing Date: Tue Feb 19 00:59:59 CET 2013
IPC: F16F 9/46
F16F 9/34
Applicants: YAMAHA HATSUDOKI KABUSHIKI KAISHA
ヤマハ発動機株式会社
Inventors: FUKUDA, Hiromi
福田 博美
Title: DAMPING FORCE CONTROL VALVE AND SHOCK ABSORBER
Abstract:
A damping force control valve (10) having improved damping force control characteristics during minute opening. The damping force control valve (10) comprises: a valve body (20) reciprocally moved by a solenoid (23); a first working fluid chamber (30) comprising a port (30a); and a second working fluid chamber (40) connected to a passage (21). The damping force is controlled by the degree of opening of a communications passage (52) that is the gap between an end surface (20a) of the valve body (20) and the port (30a). Variation of the cross-sectional area of the communications passage relative to the stroke of the valve (20), during minute opening, is reduced by forming a sloping section (20e) and an outer peripheral tapered section (20f), at a position lower than a closed section (50) of the valve body (20) being the position where the communications passage (52) is closed.