Distributed stiffness biasing spring for actuator system and fuel injector using same
US7950596B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2008 |
| Grant date | May 31, 2011 |
| Priority date | — |
| Expiry date | Jun 17, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/42
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injector includes a fuel injector body defining a fuel inlet and at least one fuel outlet, a valve having a first valve state and a second valve state and an actuator for the valve. The fuel injector includes a biasing spring including a cylindrical rolled sheet having a first spring end, a second spring end and defining a longitudinal center axis. The cylindrical rolled sheet is configured to change in length to bias the actuator toward the first actuator position and includes a helical seam located between the first spring end and a second spring end which has a shape adapted to reduce non-uniformity in a spring constant via distributing stiffness about the longitudinal center axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.