Hydraulic damper of adjustable damping force type
US4645044A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1985 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Jun 19, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7859
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic damper of the adjustable damping force type includes a cylinder containing hydraulic liquid therein, a piston working in the cylinder and partitioning the interior thereof into two liquid chambers and having a damping force generating mechanism, a piston rod connected to the piston and extending through one of the liquid chambers to the outside of the cylinder, a coaxial bore formed in the piston rod, a liquid passage communicating the liquid chambers independently from the damping force generating mechanism and including at least a portion of the bore in the piston rod, an adjusting rod inserted into the coaxial bore and operated rotatably from the outside of the damper, and a rotary valve secured to the adjusting rod for selectively changing the effective passage area of the liquid passage. A generally cylindrical orifice tube having a plurality of circumferentially spaced first orifices is provided in a midportion of the liquid passage, the rotary valve slidingly engaging with the inner circumference of the orifice tube. A check valve having a plurality of second orifices normally resiliently engages with the outer circumference of the orifice tube. The second orific…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.