Patent ID: 8230831

Claim:
Exhaust valve mechanism for an internal combustion engine with at least one exhaust valve in each engine cylinder, comprising: a main rocker arm for each cylinder mounted on a rocker arm shaft for normal operation of the exhaust valve by actuation of a camshaft with a cam element for each rocker arm; a secondary rocker arm arranged on the main rocker arm and mounted on the rocker arm shaft for activation of an exhaust brake function, which activation is achieved through supply of hydraulic pressure to a piston cylinder which acts between both the main and secondary rocker arms and takes place through effect of one of the cam elements of the cam shaft; and a spring device arranged so as to act between a fixed point on the engine and the secondary rocker arm in such a way that the secondary rocker arm is caused by spring force to engage with the one of the cam elements, the spring device acting against the secondary rocker arm at a point which lies between a bearing shaft of the secondary rocker arm and a point of contact between the secondary rocker arm with the one of the cam elements.