Exhaust accessory device for exhaust pipe

Abstract

The invention relates to an exhaust accessory device for exhaust pipe, which is installed in an exhaust pipe system of a vehicle, including an outer pipe, a front cover portion, a catalytic converter and a rear cover portion, wherein a central communication hole is set inside of the catalytic converter, an annular catalytic conversion element is set on the periphery of the central communication hole, an oxygen sensor is set on the periphery of the outer pipe. By the composition of above structure, the exhausted emissions are provided to be filtered and burned for the second time to increase engine displacement efficiently and create a back pressure effect to assist engine for increasing horsepower.

What is claimed is: 
     
         1 . An exhaust accessory device for exhaust pipe, which is installed in an exhaust pipe system of a vehicle, which includes an outer pipe, a front cover portion, a catalytic converter and a rear cover portion, wherein:
 the outer pipe, which is a hollow housing including an accommodating space, an installation hole is set on the periphery of the outer pipe, the installation hole is provided for an oxygen sensor to install;   the front cover portion, which is covered on the front end of the outer pipe, the front cover portion includes a front cover and a front mesh casing, a front communication hole is set on the front cover, an end of the front mesh casing is set on the front communication hole;   the catalytic converter, which is installed in the accommodating space of the outer pipe, a central communication hole is set inside of the catalytic converter, an annular catalytic conversion element is set on the periphery of the central communication hole;   the rear cover portion, which is covered on the rear end of the outer pipe, a rear cover, a rear mesh casing and a sleeve, a rear communication hole is set on the rear cover, the rear mesh casing is set inside of the rear cover, a communication hole is set on the rear mesh casing, the sleeve is set inside of the communication hole.   
     
     
         2 . The exhaust accessory device for exhaust pipe as claimed in  claim 1 , wherein multiple mesh holes are set on the front mesh casing. 
     
     
         3 . The exhaust accessory device for exhaust pipe as claimed in  claim 1 , wherein multiple mesh holes are set on the rear mesh casing. 
     
     
         4 . The exhaust accessory device for exhaust pipe as claimed in  claim 1 , wherein the sleeve includes a through hole.