Variable valve actuator apparatus
US6055949A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 23, 1998 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | Dec 23, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L13/0021
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable valve actuation (VVA) apparatus for an internal combustion engine comprises a drive cam fixed to a drive shaft, a valve operating (VO) cam supported by the drive shaft for pivotal motion, and a motion transmitting mechanism interconnecting the drive cam and the VO cam. The VO cam having a cam surface that extends at least from a cam lift start point to a maximum cam lift point. The cam surface includes a first section providing a ramp section, a second section providing a positive acceleration section, and a third section providing a zero acceleration section that includes a situation where acceleration continuously vary within a predetermined infinitesimal window about zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.