| 摘要 |
<p>A silencer exhibiting excellent silence characteristics for damping the delivery sound over a wide range including the entire region of low frequency zone, intermediate frequency zone, and high frequency zone without increasing the muffler volume. In the silencer (1) where the inside space of a muffler shell (2) is partitioned into a first chamber (3) and a second chamber (4) and a control valve (14) opening/closing freely depending on the flow rate of exhaust gas is fixed to the outlet portion (6b) of an inlet pipe (6) by means of a torsion coil spring (15), the second chamber (4) is changed to a low frequency resonator chamber for dampingthe delivery sound in the low frequency zone, an intermediate frequency resonator chamber for damping the delivery sound in the intermediate frequency zone, and an expansion chamber for damping the delivery sound in the high frequency zone by varying the opening of the control valve (14) stepwise.</p> |
