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An exhaust apparatus for a vehicle includes a spark arrester having a tubular spark arrester body assembled on a rear portion of a muffler connected to an exhaust pipe. A tail pipe is inserted in the spark arrester body and is mounted on the spark arrester such that exhaust gas flowing through the m

An exhaust apparatus for a vehicle includes a spark arrester having a tubular spark arrester body assembled on a rear portion of a muffler connected to an exhaust pipe. A tail pipe is inserted in the spark arrester body and is mounted on the spark arrester such that exhaust gas flowing through the muffler is discharged into the atmospheric air from the tail pipe through the spark arrester, to carry out, expansion and contraction of exhaust gas in the spark arrester occurs to augment the sound reduction performance. An annular partition plate cooperates with an inner face of a spark arrester body to form a throttle path therebetween that is securely mounted on a tail pipe wherein a plurality of expansion chambers that communicate with each other through the throttle path are formed between the tail pipe and the spark arrester body with the annular partition plate disposed therebetween.

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1. An exhaust apparatus for a vehicle wherein a spark arrester includes a tubular spark arrester body with a front end and a rear end, said rear end of said spark arrester being mounted adjacent to a rear portion in a muffler connected to an exhaust pipe and a tail pipe inserted in said spark arrest

1. An exhaust apparatus for a vehicle wherein a spark arrester includes a tubular spark arrester body with a front end and a rear end, said rear end of said spark arrester being mounted adjacent to a rear portion in a muffler connected to an exhaust pipe and a tail pipe inserted in said spark arrester body, said tail pipe being mounted on said spark arrester wherein exhaust gas flowing through said muffler is discharged into the atmospheric air from said tail pipe through said spark arrester comprising:a first separator being disposed between the muffler and the spark arrester body with the front end of the spark arrester body, the spark arrester body extending beyond the first separator for forming a first expansion chamber;said first separator including an annular plate portion positioned adjacent to an inner face of said spark arrester body for forming a throttle path therebetween, said annular plate portion being securely mounted on said muffler;a plurality of expansion chambers for communicating with each other through said throttle path, said plurality of expansion chambers being formed between said tail pipe and said spark arrester body with said annular plate portion disposed; anda cap attached to the front end of said spark arrester body for closing an opening at the front end of said spark arrester body,said cap extending beyond the first separator,said spark arrester body having an opening extending in an outer peripheral surface thereof for providing communication between at least a first expansion chamber and a second expansion chamber, andsaid tail pipe extending within said spark arrester body with front end of said tail pipe extending beyond said first separator.2. The exhaust apparatus for a vehicle according to claim 1, wherein the tail pipe is removably mounted on said spark arrester.3. The exhaust apparatus for a vehicle according to claim 1, wherein said spark arrester body extends a predetermined distance within said muffler and the cap disposed on the front end of said spark arrester body is disposed within said muffler.4. The exhaust apparatus for a vehicle according to claim 1, and further including a second separator disposed between said muffler and said spark arrester body for forming a second expansion chamber disposed between said first separator and said second separator, said rear end of the spark arrester body extending beyond the second separator for forming the second expansion chamber.5. The exhaust apparatus for a vehicle according to claim 4, and further including an annular end plate disposed between said muffler and said spark arrester body for forming a third expansion chamber disposed between said second separator and said rear portion of said muffler.6. The exhaust apparatus for a vehicle according to claim 1, wherein a first throttle path is disposed between said first separator and an exterior surface of said spark arrester.7. The exhaust apparatus for a vehicle according to claim 1, wherein a second throttle path is disposed between said second separator and an exterior surface of said spark arrester.8. The exhaust apparatus for a vehicle according to claim 1, wherein said annular plate portion forming the throttle path with the inner face of said spark arrester body is a third throttle path.9. The exhaust apparatus for a vehicle according to claim 1, and further including at least one opening disposed within said tail pipe and being in communication with said expansion chambers for discharging exhaust gas from said tail pipe.10. An exhaust apparatus for a vehicle comprising:a spark arrester having a spark arrester body with a rear end and a front end, said rear end of said spark arrester body being assembled adjacent to a rear end of a muffler connected to an exhaust pipe;a tail pipe inserted in said spark arrester body, a rear end of said tail pipe being removably mounted on said rear end of said spark arrester body wherein exhaust gas flowing through said muffler is discharged into the atmospheric air from said tail pipe through said spark arrester;a first separator being mounted on said muffler to extend inwardly in a radial direction from an inner periphery of said muffler for forming a first expansion chamber and a second expansion chamber between said muffler and said spark arrester body;said first separator cooperating with an outer face of said spark arrester body to form a throttle path therebetween;said throttle path enabling said first chamber and said second chamber to communicate with each other;a cap attached to said front end of said spark arrester body for closing an opening at said front end of said spark arrester body,the front end of said spark arrester body extending beyond the first separator,said cap and a front inner face of said spark arrester body defining a third expansion chamber inside said spark arrester body;said spark arrester body having an opening extending in an outer peripheral surface thereof for providing communication between at least said first expansion chamber and said third expansion chamber and said tail pipe extending within said spark arrester body with a front end of said tail pipe extending beyond said first separator.11. The exhaust apparatus for a vehicle according to claim 10, wherein the tail pipe is removably mounted on said spark arrester.12. The exhaust apparatus for a vehicle according to claim 10, wherein said spark arrester body extends a predetermined distance within said muffler and the cap disposed on the front end of said spark arrester body is disposed within said muffler.13. The exhaust apparatus for a vehicle according to claim 10, and further including a second separator disposed between said muffler and said spark arrester body for forming said second expansion chamber disposed between said first separator and said second separator, said rear end of the spark arrester body extending beyond the second separator for forming the second expansion chamber.14. The exhaust apparatus for a vehicle according to claim 13, and further including an annular end plate disposed between said muffler and said spark arrester body for forming said third expansion chamber disposed between said second separator and said rear end of said muffler.15. The exhaust apparatus for a vehicle according to claim 10, wherein a first throttle path is disposed between said first separator and an exterior surface of said spark arrester.16. The exhaust apparatus for a vehicle according to claim 10, wherein a second throttle path is disposed between said second separator and an exterior surface of said spark arrester.17. The exhaust apparatus for a vehicle according to claim 10, wherein said annular plate portion forming the throttle path with the inner face of said spark arrester body is a third throttle path.18. The exhaust apparatus for a vehicle according to claim 10, and further including at least one opening disposed within said tail pipe and being in communication with said expansion chambers for discharging exhaust gas from said tail pipe.19. An exhaust apparatus for a vehicle wherein a spark arrester having a tubular spark arrester body is assembled to a rear portion in a muffler connected to an exhaust pipe and a rear portion of a tail pipe which is cylindrical and inserted in said spark arrester body is removably mounted on a rear portion of said spark arrester body such that exhaust gas flowing through said muffler is discharged into the atmospheric air from said tail pipe through said spark arrester, the exhaust apparatus comprising:a lid plate which closes a front end of said tail pipe being securely mounted at the front end of said tail pipe; andan annular partition plate which extends outwardly in a radial direction from an outer periphery of said tail pipe being provided integrally on an outer periphery of said lid plate, wherein an outer periphery of said annular partition plate cooperates with an inner face of said spark arrester body to form a throttle path therebetween, wherein said annular partition plate cooperates with an inner face of said spark arrester body to form a first expansion chamber between a front end of said spark arrester and said annular partition plate,wherein said first expansion chamber and said second expansion chamber communicate with each other through said throttle path.