DISCHARGE DEVICE FOR TWO-CYCLE ENGINE

摘要

PURPOSE:To prevent the resonant frequency of a resonance pipe from being varied by bringing the pipe wall of the resonance pipe into contact with a high temperature portion near a discharge port so that the heat quentity conveyed to the resonance pipe is increased and thereby the temperatre change due to the effect of the outside air, etc. is decreased. CONSTITUTION:An exhauster 5 is constituted with a discharge pipe 7 connected to the discharge hole 6a of a two-cycle engine 6 and a resonance pipe 8 with its pipe wall 8a brought into contact with the inner peripheral surface 7a of the discharge pipe 7 which is near the discharge hole 6a and becomes a high temperature when the engine is in operation. The discharge pipe 7 is provided so that the frequency characteristic of a pulsating wave due to the discharge gas flowing through the discharge pipe 7 matches the opening/closing timing of the discharge hole 6a when the engine 6 is operated at a high speed. The resonance pipe 8 is formed in a cylindrical shape with its both ends closed, and a resonance chamber 8c inside the reconance pipe is communicated to the inside of the discharge pipe 7 through an opening portion 8b formed on the pipe wall 8a.