Engine Breather Tube Side Routing for Easier Maintenance
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Solution Overview
Problem
The difficulty in accessing the breather tube for maintenance in vehicles, particularly motorcycles, leads to deteriorated ease of maintenance, and there is a risk of oil leakage into the air cleaner during vehicle inclinations.
Innovation Solution
The breather tube is positioned at a first side of the vehicle width direction middle of the cylinder block, with a connection portion located outside the cylinder block, allowing easy access and minimizing oil leakage into the air cleaner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the breather tube is positioned inside or near the center of the cylinder block, then the engine structure is compact, but the ease of maintenance deteriorates due to difficult access
Solution Approach 1:
The breather tube connection portion is positioned at the left or right side of the cylinder block in the vehicle width direction, utilizing the lateral dimension rather than the central vertical arrangement. This spatial repositioning in another dimension provides easy access from the side while maintaining compact engine structure.
2Ease of operation
If the breather tube is positioned at the side of the cylinder block for easy access, then maintenance becomes easier, but the risk of oil leakage into the air cleaner increases during vehicle inclinations
Solution Approach 1:
The breather tube is divided into multiple sections: a first section connected to the crankcase, a second section extending upward, and a third section connecting to the air cleaner. This segmentation with intermediate positioning prevents direct oil flow paths while maintaining accessibility, as the oil must overcome gravitational resistance through the segmented structure.
Solution Approach 2:
The breather tube is positioned and oriented to preemptively counteract oil flow during vehicle inclinations. The tube's upward extension and specific connection angles create preliminary resistance to oil movement toward the air cleaner before inclinations occur, preventing oil leakage proactively.
Data Source
AI summary
A vehicle includes: an internal combustion engine used for traveling and including a crank case and a cylinder block connected to the crank case; an air cleaner that purifies intake air to be supplied to the internal combustion engine; and a breather tube that is connected to the crank case and the air cleaner and supplies a gas in the crank case toward the air cleaner. A connection portion between the breather tube and the crank case is located at a first side of a vehicle width direction middle of the cylinder block in a vehicle width direction.