Valve drive for an internal combustion engine, internal combustion engine comprising such a valve drive, and method for operating an internal combustion engine comprising such a valve drive
US11149597B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2017 |
| Grant date | Oct 19, 2021 |
| Priority date | — |
| Expiry date | Dec 11, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/0012
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A valve drive for an internal combustion engine, including a gas exchange valve; a first mechanically driven drive mechanism; and a second drive mechanism connected to the gas exchange valve to move same. The first and second drive mechanisms connected via a hydraulic coupling device that has a pressure chamber, which can be relieved of pressure via a valve device and is designed to couple the drive mechanisms by hydraulic pressure and to decouple same in a pressure-relieved state. The valve device has two switch valves fluidically connected to the pressure chamber in parallel and via which the pressure chamber is relieved of pressure in the open state of at least one of the switch valves. The valve drive has a controller that actuates the switch valves in a delayed manner to provide a variable valve stroke of the gas exchange valve during a stroke movement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.