| 摘要 |
PURPOSE:To decrease the maximum size in a width direction, by constituting a guide mechanism, which guides sliding of a control valve opening and closing the opening upper part of an exhaust passage, by a guide rod, parallelly pro vided in a sliding direction of the control valve, and a slider slidably fitted to the guide rod and connected with the control valve. CONSTITUTION:A control valve 8, being slidably supported in a direction crossing with an exhaust passage 2 communicating with the inside of a cylinder 3 and enabling the upper part of an opening of the exhaust passage 2 to be opened and closed, is opened and closed by a driving mechanism 10 containing plural sets of worm gears 23 consisting of an actuator 20, worm gear 21 and a worm wheel 22. While the control valve 8 provides a guide mechanism 9 to be lined, but said mechanism 9 is constituted by a guide rod 11, parallelly arranged to a sliding direction of the control valve 8 and fixed to a cylinder wall, and a slider 12, slidably fitted to said rod 11 and connected with the control valve 8 through a connecting arm 14, and the slider 12 connects with the driving mechanism 10 through a rack 15 and a pinion 16. |
