Damping force control type shock absorber
US8800729B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2012 |
| Grant date | Aug 12, 2014 |
| Priority date | — |
| Expiry date | Jul 24, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/465
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
During either of the extension and compression strokes, hydraulic liquid flows from a cylinder upper chamber into a reservoir through an annular passage and a damping force control mechanism, and a damping force is generated by the damping force control mechanism. The check valve is provided with a sub-check valve in parallel thereto, which opens in a very low piston speed region to allow the hydraulic liquid to flow through an orifice passage. These check valves are opened successively as the piston speed increases, thereby generating a sufficiently small damping force in the very low piston speed region during the compression stroke of the piston rod, and obtaining a moderate damping force when the piston speed increases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.