Abstract: A variable valve apparatus includes: a housing having a pair of shaft holes and a gate hole formed in the housing; a gate provided to selectively open the gate hole; a shaft provided in the shaft holes and connected to the gate; and a spring provided on the shaft so as to elastically support the gate, in which a gap is formed between the gate and the housing. The variable valve apparatus may be provided as part of a muffler installed in a vehicle.

Abstract: A variable muffler may include a housing, a plurality of chambers formed by partitions in the housing, an inlet pipe connected to at least a chamber for flowing exhaust gas into the housing, an outlet pipe connected to at least a chamber for discharging the exhaust gas having flowed into the housing to the exterior, an inner pipe for directly communicating between at least two chambers in the housing so that the exhaust gas of the inlet pipe is communicated to the outlet pipe therethrough, and a variable valve that is disposed downstream of the inner pipe and of which opening amount is continuously adjusted according to pressure of exhaust gas passing through the inner pipe.