Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1999-05-17
2000-02-22
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181227, 181272, F01N 708
Patent
active
060269308
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an exhaust device having a pair of mufflers on the right and left sides of a vehicle body in a vehicle such as a motorcycle on which a single-cylinder engine is mounted.
DESCRIPTION OF THE PRIOR ART
Japanese Patent Laid-open No. 2-241920 discloses an exhaust device having a pair of mufflers on the right and left sides of a vehicle body in a motorcycle on which a single-cylinder engine is mounted.
This exhaust device includes an exhaust pipe extending from the single-cylinder engine toward one side of a rear portion of the vehicle body, a first muffler connected to a rear end portion of the exhaust pipe and provided on one sides of the vehicle body, a second muffler provided on the other side of the vehicle body opposite to the first muffler, and a connecting pipe for connecting a front end portion of the second muffler and a front end portion of the first muffler so as to extend laterally of the vehicle body.
While the surface of an outward appearing portion of the exhaust device is required to be plated, such a plated portion is possibly discolored by exhaust heat. To prevent such discoloration, each of the exhaust pipe, the connecting pipe, and the first and second mufflers must be formed to have a double-pipe structure, and the outer surface of each component must be plated.
However, the connection between these double-pipe structural components is complicated in structure, and much time is required for manufacturing. Further, if the connecting portion is formed to have a single-pipe structure, the plated surface of the exhaust device as a whole becomes discontinuous, and partial discoloration occurs, so that it is difficult to maintain the appearance of the exhaust pipe good.
It is accordingly an object of the present invention to provide an exhaust device for use with a single-cylinder engine in which a pair of mufflers can be provided on the opposite sides of a vehicle body without damage to the appearance, and a good look can be maintained with easy manufacturing.
DISCLOSURE OF THE INVENTION
FIG. 1 shows the principle of the present invention. As shown in FIG. 1, the exhaust device for vehicle according to the present invention includes a single-cylinder engine 1, an exhaust pipe 2 extending from the single-cylinder engine 1 toward one side of a rear portion of a vehicle body, a branch and joint member 3 connected to a rear end portion of the exhaust pipe 2, a first muffler 4 connected to a rear end portion of the branch and joint member 3 and provided on one side of the vehicle body, a second muffler 5 provided on the other side of the vehicle body opposite to the first muffler 4, a connecting pipe 6 connecting a front end portion of the second muffler 5 and the branch and joint member 3 and extending laterally of the vehicle body, a first cover 7 for covering an outer side surface of the branch and joint members 3, and a second cover 8 for covering an outer side surface of a connecting portion between a front portion of the second muffler 5 and the connecting pipe 6.
Each of the exhaust pipe 2, the first muffler 4, and the second muffler 5 has a double-pipe structure with outside plating. Each of the branch and joint member 3 and the connecting pipe 6 has a single-pipe structure. Each of the first and second covers 7 and 8 is plated.
Preferably, a front end portion of the second cover 8 is curved toward the center of the vehicle body, and a phantom line as a continuous frontward extension from the front end portion of the second cover 8 is positioned before the axis of the connecting pipe.
The rear end portion of the exhaust pipe 2 having a double-pipe structure and the front end portion of the first and second mufflers 4 and 5 both having a double-pipe structure are connected together through the branch and joint member 3 and the connecting pipe 6 both having a single-pipe structure. Accordingly, the connection structure of each connecting component can be simplified and the exhaust device can be easily manufactured.
Further, the oute
REFERENCES:
patent: Re31989 (1985-09-01), Nomura et al.
patent: 3949829 (1976-04-01), Honda et al.
Abstract for Japanese Patent Publication 02-241920 (A), Sep. 1990.
Abstract for Japanese Patent Publication 08-028258 (A), Jan. 1996.
Abstract for Japanese Patent Publication 51-093015 (U), Jul. 1976.
Abstract for Japanese Patent Publication 59-093917 (A), Jun. 1988.
Abstract for Japanese Patent Publication 63-134809 (A), May 1984.
Ogisu Noriyuki
Shindome Kazuya
Sugano Tadashi
Dang Khanh
Honda Giken Kogyo Kabushiki Kaisha
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