Valve-operation control system for internal combustion engine
US5529032A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1995 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Feb 28, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2275/18
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A valve-operation control system for an internal combustion engine includes a timing transmitting device for transmitting the rotational power of a crankshaft at a speed reduction ratio of 1/4 to a cam shaft, and intake-side and exhaust-side valve operating devices. Each of the valve operating device includes a first cam provided on the cam shaft and having a single cam lobe protruding outwardly with a valve-opening profile suitable for an extremely low-speed operation of the engine, a second cam provided on the cam shaft and having a pair of cam lobes provided at locations circumferentially spaced apart through 180 degrees to protrude outwardly with an opening profile suitable for a low-speed operational state of the engine, a third cam provided on the cam shaft and having a pair of cam lobes provided at locations circumferentially spaced apart through 180 degrees to protrude outwardly with an opening profile suitable for a high-speed operational state of the engine, with first, second and third rocker arms following the first, second and third cams, respectively. A connection switchover device is provided in the first, second and third rocker arms for switching the selective conn…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.