Frequency-modifying muffler

摘要

A muffler for raising the audible pitch of an internal combustion engine's exhaust note that includes an enclosed case having an inlet and an outlet, and a plurality of flow-directing components which are adapted to subdivide an inlet flow into a plurality of discrete interior flows, including a first interior flow providing the shortest flow length through the muffler between the inlet and the outlet, a second interior flow having a flow length at least about twice the length of the first interior flow, and one or more intermediate flows following by-pass passages to split off from the second interior flow between the inlet and the outlet and having flow lengths between the flow lengths of the first and second flows.

主权项

1. A muffler for raising an audible pitch of an internal combustion engine's exhaust note, comprising:
an enclosed case having an inlet and an outlet; and a plurality of flow-directing components adapted to subdivide an inlet flow into a plurality of discrete interior flows comprising:
a first discrete interior flow passage providing the shortest flow length through the enclosed case between the inlet and the outlet;a second discrete interior flow passage between the inlet and the outlet and having a flow length at least about twice the flow length of the first interior flow passage; andat least one discrete intermediate interior flow passage following a by-pass passage, and wherein the at least one intermediate interior flow passage splits off from the second interior flow passage between the inlet and the outlet; wherein the plurality of flow-directing components comprises:
a plurality of interior deflector assemblies, each spanning a distance between a top and a bottom of the enclosed case and comprising a parallel surface and a transverse surface extending from a backside of the parallel surface, andat least one side deflector assembly spanning a distance between a top and a bottom of the enclosed case and extending from a sidewall of the enclosed case into a gap between the transverse surfaces of at least two of the plurality of interior deflector assemblies to form the tortuous passage for the second interior flow passage.