Apparatus and method for engine braking
US7909015B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Oct 30, 2008 |
| Grant date | Mar 22, 2011 |
| Priority date | — |
| Expiry date | Jan 1, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L13/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Apparatus and method are disclosed for converting an internal combustion engine from a normal engine operation (20) to an engine braking (or retarding) operation (10). The engine has an exhaust valve train containing two exhaust valves (300), a valve bridge (400) and an exhaust valve lifter (200). The apparatus has an actuation means (100) including a hydraulic system integrated into the exhaust valve train. The hydraulic system contains a braking piston (160) slidably disposed in the valve bridge between an inoperative position (0) and an operative position (1). In the inoperative position, the braking piston is retracted and the actuation means disengaged from the normal engine operation. In the operative position, the hydraulic piston is extended and the actuation means opens one of the two exhaust valves (300a) for the engine braking operation. The apparatus also includes engine brake reset means (150) for modifying the valve lift profile generated by the enlarged normal cam lobe (220) when the small braking cam lobes (232) and (233) are integrated into the normal exhaust cam (230). The apparatus also has a control means (50) for moving the actuation means between the inoperati…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.