Engine braking apparatus with two-level pressure control valves
US7984705B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 5, 2009 |
| Grant date | Jul 26, 2011 |
| Priority date | — |
| Expiry date | Feb 14, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D13/0246
- 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 apparatus has an actuation means (100) containing two braking pistons (160) slidably disposed in the valve bridge (400) between an inoperative position (0) and an operative position (1). The apparatus also has a flow control valve (50) for supplying control fluid to the actuation means (100) with two levels of pressure. At the first level or lower pressure, the braking pistons (160) will stay in the inoperative position (0), and a gap (234) is formed between the valve bridge (400) and the exhaust valves (300) to skip the motion from the lower portion of the cam (230) for the normal engine operation (20). At the second level or higher pressure, the braking pistons (160) will be moved to the operative position (1), and a linkage is formed between the valve bridge (400) and the exhaust valves (300) so that the motion from the whole cam (230) can be transmitted to the valves (300) for the engine braking operation (10). The apparatus also includes a supporting means (250) for preventing any no-follow of the valve trai…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.