Hydraulic shock absorber
US7040468B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 25, 2003 |
| Grant date | May 9, 2006 |
| Priority date | — |
| Expiry date | Aug 25, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/348
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic shock absorber includes a cylindrical housing within which a piston assembly is slidably received. The piston assembly includes a piston element connected to a piston rod and adapted to divide an interior of the housing into compression and rebound chambers. The piston element has compression and rebound passages to provide fluid communication between the compression and rebound chambers. A valve assembly includes a first valve disc positioned on a lower side of the piston element, and a second valve disc retained on the first valve disc. The second valve disc includes apertures arranged in a circumferentially spaced relationship and are selectively openable and closeable by the first valve disc. A third valve disc is retained on the second valve disc and has notches arranged in a circumferentially spaced relationship. The notches cooperate with the apertures to collectively form ports. The ports are communicated with the compression chamber. A fourth valve disc cooperates with the second valve disc to sandwich the third valve disc so that restrictive orifices are defined in an outer end of the notches. Each of the ports has a cross sectional area greater than that of t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.