| 摘要 |
The invention relates to a four-stroke internal combustion engine with an engine brake (2), with at least one exhaust valve (4a, 4b) per cylinder, said valve being actuated by means of a camshaft (16) and at least one valve lever arrangement (5), and with an arrangement for advancing the exhaust control system, the valve lever arrangement (5) having an exhaust lever (6) which is actuated by an exhaust cam (14) and a brake lever (7) which can be actuated by a brake cam (15). The brake lever (7) has a first brake lever part (7a) on the camshaft side and a second brake lever part (7b) on the exhaust valve side, the two brake lever parts (7a, 7b) being mounted so as to rotate independently about a lever shaft (21) and such that they can be connected to one another for rotation in engine-braking mode by means of a locking element (9) which can be moved between two positions. According to the invention, in order to produce an engine brake having dual braking phases as simply as possible and with minimal space requirements, the exhaust lever (6) has a first exhaust lever part (6a) on the camshaft side and a second exhaust lever part (6b) on the exhaust valve side, the two exhaust lever parts (6a, 6b) being mounted so as to rotate independently about the lever shaft (21) and such that they can be connected to one another for rotation by means of the locking element (9) when not in engine-braking mode. |
