Method and arrangement for affecting engine braking
US6792904B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2003 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Jun 20, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D13/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Method and arrangement for engine breaking in motor vehicles having an internal combustion engine with at least one cylinder, at least one exhaust valve at the cylinder and a rocker arm (4) for activation of the exhaust valve. The rocker arm (4) is arranged on a hollow rocker arm shaft (5) and arranged to be effected by ridges (2a, 2b, 2c) on a camshaft (2), the device additionally having a control valve (15, 16) for controlling the oil pressure in the rocker arm shaft (5), and means (6; 14) receptive to an increase of the oil pressure in the rocker arm shaft (5) being integrated in the rocker arm (4) for absorbing a play between the rocker arm (4) and the exhaust valve in the case of increase oil pressure. At least one of the ridges (2b, 2c) causes opening of the exhaust valve with an engine breaking effect. The control valve (15) includes an adjustable valve body (18, 19) and a canal (23) between the valve body (18, 19) and the rocker arm shaft (5) that has a controllable exhaust (36), the valve body (18, 19) being arranged to be positioned in a first position with pressure reducing effect and a second position without pressure reducing effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.