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US 5,902,971 AGranted
Muffler for internal combustion engine
AssigneeKioritz Corporation
InventorsYasuharu Sato, Yukio Sakaguchi, Kengo Kubo
Life of this patent
Estimating the term…
Abstract
A muffler for a two-stroke internal combustion engine includes an expansion chamber into which exhaust gas ejected from the exhaust port of the engine is introduced. An air-supplying device is adapted to supply outside air to the expansion chamber. The air-supplying device is actuated by taking advantage of the pressure pulsation in the crank case of the engine, and is constituted by a diaphragm pump.
Claims5
A muffler for a 2-stroke internal combustion engine having a crank case, said muffler comprising:
- an expansion chamber for receipt of exhaust gas ejected from the internal combustion engine;
- a pump which is fluidly connected to said expansion chamber for supplying outside air to said expansion chamber, said pump having a port in fluid communication with the crank case for exposure to pressure pulsation therein, said pump being actuated by the pressure pulsation in the crank case of the internal combustion engine so as to supply the outside air to said expansion chamber;
- and
- a purifying member disposed inside said expansion chamber.
1 more element
A muffler for a 2-stroke internal combustion engine having a crank case, said muffler comprising:
- an expansion chamber for receipt of exhaust gas ejected from the internal combustion engine;
- a diaphragm pump which is fluidly connected to said expansion chamber for supplying outside air to said expansion chamber, said diaphragm pump having a port in fluid communication with the crank case for exposure to pressure pulsation therein, said pump being actuated by the pressure pulsation in the crank case of the internal combustion engine so as to supply the outside air to said expansion chamber;
- and
- a purifying member disposed inside said expansion chamber;
- wherein said diaphragm pump comprises:
- a pressure-driving chamber communicating with the crank case;
- a back-pressure-actuating chamber;
- a diaphragm partitioning said pressure-driving chamber from said back-pressure-actuating chamber;
- a valve system comprising a suction valve and a discharge valve;
- and
- said back-pressure-actuating chamber communicates with the external atmosphere through said suction valve and with the expansion chamber through said discharge valve.
8 more elements
Dependencies are inferred from the claim text.