Muffling device and method for internal combustion engine

Abstract

A device and method for muffling the sound from an internal combustion engine is described, wherein the device is a tube made of a suitable material such as rubber and is attached to the exhaust outlet of the vehicle. Further described is a method of muffling the sound of an internal combustion engine that is comprised of taking a length of tubing having a spring disposed therein, and attaching one end of the tubing to the outlet of the exhaust of an internal combustion engine, and directing the other end of the tubing toward the ground surface, by forming an approximate ninety degree bend, such that the second end of the tubing is in close proximity with the ground surface, with the result that the sound level of the exhaust from the engine is substantially reduced.

Description

TECHNICAL FIELD The present invention relates generally to a device and method for reducing the exhaust noise of internal combustion engines, and more particularly to a method and apparatus for muffling the exhaust noise of vehicles, including particularly, but not limited to, four-stroke internal combustion engines. BACKGROUND OF THE INVENTION Beginning with the early days of internal combustion engines, there has been an effort to reduce the sound levels that are produced during operation of these devices. Typically, there are various sources of sound that are produced during operation. As the fuel / air mixture is detonated, there is the sound generated by the explosion. Internally, there are various moving parts that generate noise due to their interaction. During intake and exhaust, there is also the sound of fluid rushing in or rushing out of the engine. While some of the noises emanate from the metal casing of the engine itself, a substantial portion of these sounds may be h...

AI Technical Summary

Benefits of technology

"The present invention is a device that reduces exhaust noise from internal combustion engines. It achieves this by directing the exhaust tube downward into the ground, which absorbs and dampens sound waves. The device is designed to be used by hunters and outdoorsmen to quieten the sound of their vehicles and to allow them to observe wildlife at closer proximity without causing potential damage to the human ear. It can also be used to quieten generators and increase the power of the engine. Overall, the invention reduces exhaust noise by about 50% and provides a quieter approach for motor vehicles."

Problems solved by technology

Internally, there are various moving parts that generate noise due to their interaction.

Thus there will be some attenuation due to this effect.

Although there are various engine muffling devices and methods available, each is disadvantageous when compared to the present invention.

The foregoing describes a traditional muffler type device used on vehicles, and, while adequate for some uses, particularly in urban areas where there is much surrounding noise, it falls short in achieving a level of quietness desirable for wilderness areas.

The Kempka et al. device is overly complicated as an add-on component to follow a standard muffler.

While generally simple in design, the Gerber device still requires more components than desirable.

Accordingly, the Ishida device requires several components, increasing the cost of manufacture.

However, the flared / conical exhaust outlet of Walsh will cause an augmentation of sound rather than a diminution thereof.

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