Patent ID: 6792904
Filing Date: 2004-09-21
Classification: F01L,F02D

Abstract:
Device for engine braking in motor vehicles comprising an internal combustion engine with at least one cylinder, at least one exhaust gas valve at said cylinder and a rocker arm (4) for activation of said exhaust gas valve which rocker arm (4) is arranged on a hollow rocker arm shaft (5) and arranged to be affected by ridges (2a, 2b, 2c) on a camshaft (2), said device additionally comprising:a control valve (15, 16) for controlling the oil pressure in said rocker arm shaft (5), and means (6; 14), receptive to an increase of oil pressure in said rocker arm shaft (5) and integrated in said rocker arm (4) for absorbing play between said rocker arm (4) and said exhaust gas valve at increased oil pressure, with at least one of said ridges (2b, 2c) then causing opening of the exhaust gas valve with an engine braking effect, wherein said control valve (15) comprises a controllable valve body (18, 19) and a canal (23) between the valve body (18, 19) and the rocker arm shaft (5) which comprises a controllable outlet (36), with the valve body (18, 19) being arranged to be positioned in a first position with a pressure reducing effect, and a second position without a pressure reducing effect.