Abstract: An internal-combustion engine has a cylinder block and crankcase and a case structure which preferably has two cylinders or cylinder bank rows arranged in a V-shape with respect to one another. An endless drive extends on the face of the cylinders or cylinder bank rows, which drive comprises a timing chain for connecting a crankshaft with camshafts arranged in the cylinder heads. The timing drive chain is covered by a timing drive cover. The timing drive cover, or the case is structure situated opposite the timing drive, cover has a ribbing by which a targeted separation and/or return takes place of the oil carried along by the timing chain in the direction of the cylinder heads. As a result, among others, the venting of the crankcase is not hindered, which takes place by way of the timing chain case.

Abstract: An internal combustion engine is provided with at least two cylinder banks whose cylinder heads are sealed by cylinder head covers. To ventilate the crankcase from the blow-by gases, ventilation lines are connected to the cylinder head covers and communicate with a negative pressure source, e.g., an intake pipe. The inside of the cylinder head cover is provided with structure for pre-separating the oil from the blow-by gases. An oil separation chamber is equipped with an inlet and an outlet opening, each as a part of the crankcase ventilation in the cylinder head covers. The oil separation chambers communicate with the respective camshaft space through their inlet openings. This arrangement ensures reliable crankcase ventilation in which a portion of the oil carried along by the blow-by gases can already be separated in the cylinder head cover and returned to the camshaft spaces.

Abstract: The invention relates to an internal-combustion engine having a cylinder block and crankcase and a case structure which preferably has two cylinders or cylinder bank rows (2, 3) arranged in a V-shape with respect to one another, an endless drive extending on the face of the cylinders or cylinder bank rows, which drive comprises a timing chain, for connecting a crankshaft with camshafts (9 to 12) arranged in the cylinder heads, the timing drive chain (14) being covered by a timing drive cover (18). It is suggested that the timing drive cover (18) or the case structure situated opposite the timing drive cover has a ribbing (32, 34, 36) by way of which a targeted separation and/or return takes place of the oil carried along by the timing chain (14) in the direction of the cylinder heads (7, 8). As a result, among others, the venting of the crankcase is not hindered which takes place by way of the timing chain case.

Abstract: A crankcase ventilation system for an internal-combustion engine with exhaust gas turbocharging, has a first vent pipe which is connected on one side with the crankcase space and on the other side with an intake pipe of the internal-combustion engine. Viewed in the flow direction, the first vent pipe leads in behind a throttle valve arranged in the intake pipe. A second vent pipe is connected on one side with the crankcase space and on the other side with the suction side of a compressor. In the first vent pipe, a return valve is arranged which, in a supercharging pressure operation of the internal-combustion engine, prevents that the excess pressure existing in the intake pipe spreads over into the crankcase space. A return valve is arranged in the second vent pipe and the vacuum level for both vent pipes can be adjusted by way of a common pressure regulator.

Abstract: An internal combustion engine is provided with at least two cylinder banks whose cylinder heads are sealed by cylinder head covers. To ventilate the crankcase from the blow-by gases, ventilation lines are connected to the cylinder head covers and communicate with a negative pressure source, e.g., an intake pipe. The inside of the cylinder head cover is provided with structure for pre-separating the oil from the blow-by gases. An oil separation chamber is equipped with an inlet and an outlet opening, each as a part of the crankcase ventilation in the cylinder head covers. The oil separation chambers communicate with the respective camshaft space through their inlet openings. This arrangement ensures reliable crankcase ventilation in which a portion of the oil carried along by the blow-by gases can already be separated in the cylinder head cover and returned to the camshaft spaces.