Canister Arrangement Between Engine and Exhaust Pipe
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Solution Overview
Problem
In saddle-riding-type vehicles, the downward extension of the exhaust pipe from the front part of the engine poses a challenge in arranging a canister for evaporated fuel recovery due to limited space at the frontward position of the crankcase.
Innovation Solution
The canister is positioned between the engine and the exhaust pipe at the frontward position of the crankcase, with additional arrangements such as placement between downward tubes, direction in the vehicle width direction, and protection by a slanted member to optimize space utilization and thermal protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the exhaust pipe extends downward at the frontward position of the crankcase from the front part of the engine and then passes below the engine, then the exhaust system layout is simplified and thermal separation is improved, but the arrangement space for the canister at the frontward position of the crankcase becomes insufficient
Solution Approach 1:
The canister is arranged in the vehicle width direction (lateral dimension) between the downward tubes rather than in the front-to-rear direction, effectively utilizing unused lateral space to resolve the space conflict caused by the exhaust pipe configuration
Solution Approach 2:
The canister is positioned within the space defined by the vehicle body structure, specifically between the downward tubes and within the vertical space between the fender and cylinder, effectively nesting the canister into available structural voids
Data Source
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AI summary
A saddle-riding-type vehicle canister arrangement structure is a canister arrangement structure (69) of a saddle riding type vehicle (1), including: an engine (10A) that includes a crankcase (11); an exhaust pipe (14a) that extends downward at a frontward position of the crankcase (11) from a front part of the engine (10A) and then passes below the engine (10A); and a canister (70) that recovers an evaporated fuel which is generated at a fuel tank (8), wherein the canister (70) is arranged between the engine (10A) and the exhaust pipe (14a) at a frontward position of the crankcase (11).