Exhaust muffler for small internal combustion engine
OwnerMichel Arseneauinventor
Life of this patent
Estimating the term…
Abstract
The exhaust muffler as a tailpipe head member including a front end mounted inside an expansion chamber of the muffler. The front end of the head member deflects exhaust gas pressure waves passing through the chamber. An annular passage is provided by the space separating the front end of the head member and the expansion chamber. A flow regulating conduit communicates exhaust gas from the annular passage to an outside of the muffler. The front portion of the expansion chamber can be provided with a series of annular flange steps for mounting onto various sizes of annular flanges of exhaust manifolds. The exhaust muffler both reduces noise levels and improves performance of the engine.
Claims20
An exhaust muffler for a small engine producing exhaust gas, said muffler comprising:
- an expansion chamber through which exhaust gas flows, said chamber having an inlet for receiving exhaust gas from said engine, said chamber having opposite said inlet an output end of reduced cross-section;
- and
- a tail pipe head member mounted at said output end of said chamber, said head member having:
- a front end provided inside said chamber for deflecting an exhaust gas pressure wave passing through said chamber;
- a side portion provided inside said chamber and being separated from an inner side wall of said chamber, said side portion being shaped to provide a substantially annular exhaust gas passage between said chamber side wall and said side portion, said passage having a reduced cross-section for restricting exhaust gas flow;
- and
- a flow regulating conduit for communicating exhaust gas from said side portion to an outside of said muffler, whereby exhaust gas flow through said expansion chamber, said passage and said flow regulating conduit of said tail pipe head member is substantially in-line.
An exhaust muffler for a small engine producing exhaust gas and having an exhaust manifold with an annular muffler engaging surface, the muffler comprising:
- an expansion chamber through which said exhaust gas flows and having an inlet in communication with said exhaust manifold, said chamber having a tapering truncated cone-shaped front portion which includes said inlet and is detachably engageable with said exhaust manifold annular engaging surface, said front portion being provided with a series of exterior annular flange steps for engaging any size of exhaust manifold engaging surface within a predetermined range;
- and
- means for fastening said front portion to said exhaust manifold, whereby said annular flange steps improve fastening of said muffler to said manifold engaging surface and also act as acoustic ridges when located inside said manifold.
Dependencies are inferred from the claim text.