| 摘要 |
PURPOSE:To obtain a compact intake device which can cope with both low and high engine speed by inverting upper stream of the throttling valve of an intake tube order to be communicated with an intake manifold,and providing an expansion chamber communicated with the inverting section through a switching valve. CONSTITUTION:An intake tube 6 is independently provided to be communicated with each cylinder 5, and largely inverted on the upper stream of a throttling valve 10 in order to be communicated with an intake manifold 9 as an intake tube 8c in the opposite direction. In an inverting section 8b, an expansion chamber 12 is communicated with the extended part of the intake tube 6 through a switching valve 16. The switching valve 16 is closed at low engine speed so as to match the length of the intake tube to intake pulse at low speed, and is opened at high speed so as to shorten the practical length of the tube of intake pulse. Since the expansion chamber is arranged in the inverting section 8b and intake tube passage is inverted, the whole unit is made compact. |
