Exhaust muffler device
AssigneeHonda Motor Co., Ltd.
InventorsAtsushi MURAKAMI, Hiroshi MAHIRA, Tadahisa MASATANI, Kensuke HONMA, Shiro KOKUBU
Life of this patent
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Abstract
An exhaust muffler device has a ceramic catalyst body, and a holding tube having an end portion configured to hold the ceramic catalyst body therein with a holding mat therebetween. The end portion is reduced in diameter to form a reduced diameter portion. An exhaust pipe is connected to the holding tube, with a downstream end portion thereof being fitted to an inner circumference of the reduced diameter portion of the holding tube. An inner circumferential surface of the downstream end portion of the exhaust pipe is in proximity to a boundary portion of the holding mat and the ceramic catalyst body.
Claims17
An exhaust muffler device for an engine, said exhaust muffler device comprising:
- a ceramic catalyst body;
- a holding tube having an end portion configured to hold the ceramic catalyst body therein with a holding mat therebetween, said end portion being reduced in diameter to form a reduced diameter portion;
- an exhaust pipe having a downstream end portion thereof connected to the holding tube, said downstream end portion being fitted to an inner circumference of the reduced diameter portion of the holding tube, wherein
- the end portion of the holding tube is welded and fixed to the downstream end portion of the exhaust pipe wherein an inner circumferential surface of the downstream end portion of the exhaust pipe is in proximity to a boundary portion of the holding mat and the ceramic catalyst body.
A method of manufacturing an exhaust muffler device for an engine, said method comprising:
- providing a ceramic catalyst body;
- providing a holding tube having an end portion configured to hold the ceramic catalyst body therein;
- inserting the ceramic catalyst body with a holding mat wrapped therearound into the holding tube together with the holding mat from a downstream end of the holding tube;
- providing an exhaust pipe having a downstream end portion thereof connected to the holding tube on an opposite side of the holding tube;
- wherein the end portion of the holding tube is welded and fixed to the downstream end portion of the exhaust pipe, whereby an inner circumferential surface of the downstream end portion of the exhaust pipe is in proximity to a boundary portion of the holding mat and the ceramic catalyst body.
An exhaust muffler device for an engine, said exhaust muffler device comprising:
- ceramic catalyst body means for housing catalyst components therein;
- holding tube means for holding the ceramic catalyst body means therein with a holding mat therebetween, said holding tube means having an end portion being reduced in diameter to form a reduced diameter portion, said end portion holding the ceramic catalyst body means therein;
- exhaust pipe means having a downstream end portion connected to the holding tube means, said downstream end portion for being fitted to an inner circumference of the reduced diameter portion of the holding tube means,
- wherein the end portion of the holding tube means is welded and fixed to the downstream end portion of the exhaust pipe means such that an inner circumferential surface of the downstream end portion of the exhaust pipe means is in proximity to a boundary portion of the holding mat and the ceramic catalyst body means.
Dependencies are inferred from the claim text.