Volvo Lastvagnar Ab

G&ouml;ran Olsson

Sixten Berglund

Nils-Olof H&aring;kansson

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 ( ) for activation of the exhaust valve. The rocker arm ( ) is arranged on a hollow rocker arm shaft ( ) and arranged to be effected by ridges ( ) on a camshaft ( ), the device additionally having a control valve ( ) for controlling the oil pressure in the rocker arm shaft ( ), and means ( ) receptive to an increase of the oil pressure in the rocker arm shaft ( ) being integrated in the rocker arm ( ) for absorbing a play between the rocker arm ( ) and the exhaust valve in the case of increase oil pressure. At least one of the ridges ( ) causes opening of the exhaust valve with an engine breaking effect. The control valve ( ) includes an adjustable valve body ( ) and a canal ( ) between the valve body ( ) and the rocker arm shaft ( ) that has a controllable exhaust ( ), the valve body ( ) being arranged to be positioned in a first position with pressure reducing effect and a second position without pressure reducing effect.

Growing community of inventors

Göteborg, Sweden

Göran Olsson

Growing community of inventors

Göteborg, Sweden

G&ouml;ran Olsson

Göran Olsson