Inner pipe structure of motorcycle exhaust pipe

Abstract

An inner pipe structure of a motorcycle exhaust pipe of the present disclosure comprises a pipe body (10) which defines a longitudinal axis (X) and includes a front section (101), a rear section (102), and an intermediate section (103) between the front and rear sections (101, 102). The pipe body (10) further includes a center hole (14) extending therethrough. The front section (101) has an air intake end (11), and the rear section (102) has an exhaust end (12). A spiral flow guide structure unit (20) is provided in the rear section (102) adjacent to the exhaust end (12) and includes a plurality of spiral recesses (21). A porous structure unit (30) is provided in the pipe body (10) between the air intake end (11) and the spiral flow guide structure unit (20) and includes a plurality of perforations (13). A divergence angle (41) inclined relative to the longitudinal axis (X) is formed between the rear section (102) and the intermediate section (103) and between the intermediate section (103) and the front section (101).