Valve train for an internal combustion engine
US5474037A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1994 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | Jun 7, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L1/185
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A valve train with a variable valve timing mechanism for at least one intake or exhaust valve E has a cam shaft with a low-speed cam and a high-speed cam. A first rocker lever interacts with the low-speed cam and the valve E. A second rocker lever interacts with the high-speed cam and can be connected to the first rocker lever via a coupling pin. To press the second rocker lever against its cam, a spring system is provided and this is formed by at least one spring, which, during the base circle phase, rests in a prestressed state directly or indirectly against a fixed stop and the rocker lever is thus relieved of load in order to reduce friction and wear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.