Muffler for internal combustion engines
AssigneePlaggio & C. S.P.A.
InventorAdriano Magherini
Life of this patent
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Abstract
A muffler (4) for motor vehicles comprising an intake pipe (8) of the exhaust gases that separates, at a fork (10), into a main pipe (12) and a secondary pipe (16), a muffler body (24) which delimits an expansion volume (28) and houses at least partly the main pipe (12) and the secondary pipe (16), wherein the intake pipe (8) of the exhaust gas is in fluid continuous connection with the main pipe (12) through the secondary pipe (16), and wherein the main pipe (12) comprises, downstream of the fork (10), a throttle valve (32) which allows or prevents a further fluidic connection of the intake pipe (8) of exhaust gas with the main pipe (12), and an output of the exhaust gases (40), for the expulsion of the gases from the muffler pipe (4).
Claims13
A muffler for internal combustion engines, comprising:
- an intake pipe for exhaust gases with an intake port for the exhaust gases adapted to be fluidly coupled to an internal combustion engine;
- wherein the intake pipe for the exhaust gases separates, at a fork, into a main pipe and a secondary pipe;
- a muffler body that delimits an expansion volume and houses at least partially the main pipe and the secondary pipe;
- wherein the secondary pipe has a distal end that is arranged opposite the fork and ends in the expansion volume;
- and wherein the main pipe has a distal end that is arranged opposite the fork and forms an outlet for the exhaust gases ending outside the expansion volume to expel the exhaust gases;
- a throttle valve provided in the main pipe and adapted selectively to allow the exhaust gases to enter, or to prevent them from entering, the main pipe;
- and
- a catalyst device provided in the intake pipe for the exhaust gases, between the intake port and the fork;
- wherein:
- between the catalyst device and the throttle valve, the main pipe comprises a wall portion, which is provided with a plurality of inlet holes arranged around an axis of the wall portion;
- the wall portion is surrounded by an outer sleeve;
- the outer sleeve and the wall portion define an annular chamber surrounding the wall portion;
- the annular chamber is fluidly coupled to the main pipe through the inlet holes and to the secondary pipe through at least one passage provided in the outer sleeve.
A motor vehicle comprising an internal combustion engine and a muffler, the muffler fluidly coupled to an exhaust of the internal combustion engine;
- wherein the muffler comprises:
- an intake pipe for exhaust gases with an intake port for the exhaust gases adapted to be fluidly coupled to an internal combustion engine;
- wherein the intake pipe for the exhaust gases separates, at a fork, into a main pipe and a secondary pipe;
- a muffler body that delimits an expansion volume and houses at least partially the main pipe and the secondary pipe;
- wherein the secondary pipe has a distal end that is arranged opposite the fork and ends in the expansion volume;
- and wherein the main pipe has a distal end that is arranged opposite the fork and forms an outlet for the exhaust gases ending outside the expansion volume to expel the exhaust gases;
- a throttle valve provided in the main pipe and adapted selectively to allow the exhaust gases to enter, or to prevent them from entering, the main pipe;
- and
- a catalyst device provided in the intake pipe for the exhaust gases, between the intake port and the fork;
- wherein:
- between the catalyst device and the throttle valve, the main pipe comprises a wall portion, which is provided with a plurality of inlet holes arranged around an axis of the wall portion;
- the wall portion is surrounded by an outer sleeve;
- the outer sleeve and the wall portion define an annular chamber surrounding the wall portion;
- the annular chamber is fluidly coupled to the main pipe through the inlet holes and to the secondary pipe through at least one passage provided in the outer sleeve.
Dependencies are inferred from the claim text.