Controllable damping force hydraulic shock absorber
US6782980B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 2002 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Nov 27, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/466
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A piston having a piston rod connected thereto is slidably fitted in a cylinder in which a hydraulic fluid is sealably contained. Extension-stroke and compression-stroke pilot type damping force control mechanisms are provided in the piston. A pilot control valve of the extension-stroke pilot type damping force control mechanism is formed by a pressure control valve having a valve seat, a valve body and a pressure-receiving portion. A pilot control valve of the compression-stroke pilot type damping force control mechanism is formed by a flow rate control valve having a spool. A slider having the valve body of the pressure control valve and the spool of the flow rate control valve is operated by a proportional solenoid, to thereby control a damping force for an extension stroke and a damping force for a compression stroke.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.