Shock absorber
US4530425A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1983 |
| Grant date | Jul 23, 1985 |
| Priority date | — |
| Expiry date | May 26, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/18
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A shock absorber including a cylinder (501), a rod (502) slidably mounted in the cylinder, and a piston (506) fixed to the rod and slidable inside the cylinder. The piston divides the cylinder into two oil-filled chambers (508, 514) and there is a third chamber (518) in the rod and including air to act as a hydraulic spring. Shocks tend to move the piston along the rod away from its equilibrium position therein, and the hydraulic spring tends to return the piston to its equilibrium position. Damping is provided by variable aperture channels between the first chamber (508) and the other two chambers (514 and 518). The channels comprise orifices (509 and 510) in a cylindrical wall of the first chamber (508) which overlap orifices in a movable cylindrical valve plate (527). A control shaft (540) leading out along the axis of the shock absorber serves to rotate the valve plate and to move it in axial translation. By ensuring that each pressure acting axially on any part of the valve plate and control shaft assembly acts on equal areas facing in opposite directions, there is little tendency for the valve plate to be moved off a setting applied thereto by the control shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.