Valve timing changing apparatus for internal combustion engine
US6135077A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1998 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Nov 4, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2001/34483
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A valve timing changing apparatus for changing valve timings of intake and exhaust valves inhibits a deterioration in the precision of a change of a valve overlap period. A first variable valve timing mechanism (first VVT) is mounted to an intake cam shaft, and a second variable valve timing mechanism (second VVT) is mounted to a crank shaft. A timing belt drivingly couples a cam pulley mounted to an exhaust cam shaft, a cam pulley of the first VVT, and a cam pulley of the second VVT to one another. The first VVT changes a rotational phase of the intake cam shaft so as to change a valve timing of intake valves. The second VVT changes rotational phases of both the intake and exhaust cam shafts so as to simultaneously change valve timings of the intake and exhaust valves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.