| 摘要 |
PURPOSE:To produce an engine brake force being highmost efficiency responding to the number of revolutions of an engine, by a method wherein two valves are located in a passage through which a combustion chamber is communicated to the open air, and are opened and closed according to an accel position and the number of revolutions of an engine. CONSTITUTION:A first valve 14 is situated to the one end of a communicating passage 12 having the one end open to a combustion chamber 7 and the other end open to the open air side, and a second valve 23 is situated to the intermediate of the passage 12. The first valve 14 is coupled to accel mechanisms 20-22, and the first valve 14 is opened in a given position passing an idle position toward a direction in which a valve is closed. The opening area of the second valve 23 is regulated according to the number of revolutions of an engine. This enables an engine brake to be actuated with high efficiency depending upon the number of revolutions of an engine.
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