Valve structure for hydraulic damper
US4819773A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1987 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Jul 14, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/3484
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic damper includes a cylinder filled with working oil, a piston rod extending axially in the cylinder, and a piston slidably disposed in the cylinder and fixed to the piston rod, the piston having an oil passage defined therein. A valve structure in the hydraulic damper has a spacer disposed around the piston rod and on one surface of the piston, a leaf valve disposed around the spacer for normally closing an end of the oil passage at the piston surface, and a restriction plate disposed around the piston rod and mounted on the spacer and the leaf valve for allowing the leaf valve to open the end of the oil passage only during one of compression and expansion strokes of the piston with respect to the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.