Vehicle Exhaust Tail Pipe Elongation via Vertical Offset Partition
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Solution Overview
Problem
Conventional exhaust structures with mufflers inside a rear cowl face limitations in tail pipe length due to the need for the muffler to match the cowl's shape, restricting exhaust air flow velocity and engine output.
Innovation Solution
The exhaust structure includes a muffler with multiple expansion chambers, offset connecting pipes, and a tail pipe that penetrates the partition, allowing elongation while maintaining or reducing width, and a tubular cover to enhance rigidity and capacity, preventing interference with the catalyst and allowing downsizing of the muffler and rear cowl.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the muffler is arranged inside the rear cowl and formed in correspondence with the shape of the rear cowl, then the exhaust structure fits within the vehicle rear portion, but the tail pipe length is limited and cannot be elongated sufficiently
Solution Approach 1:
The patent applies dimensional change by offsetting the penetrating positions of connecting pipes and tail pipe in the vertical direction. This allows the tail pipe to extend vertically through the partition rather than being constrained to horizontal alignment, effectively increasing tail pipe length without expanding the muffler's horizontal footprint within the rear cowl.
2Productivity
If the tail pipe is elongated to increase exhaust air flow velocity, then engine output characteristic is improved, but the muffler width must be increased which conflicts with the decreasing width toward vehicle rear
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension for tail pipe extension. The tail pipe penetrates the partition at a position offset vertically from the connecting pipes, allowing sufficient tail pipe length to achieve high exhaust flow velocity while keeping the muffler's horizontal width compact and compatible with the rear cowl's tapered shape.
3Area of stationary object
If the muffler is downsized in the width direction to match the rear cowl shape, then the exhaust structure becomes more compact, but the tail pipe cannot be elongated sufficiently
Solution Approach 1:
The patent overcomes this limitation by changing the spatial arrangement from horizontal alignment to vertical offset. The tail pipe penetrates the partition at a vertically offset position from the connecting pipes, enabling sufficient tail pipe length to be achieved within the constrained horizontal width of the downsized muffler that matches the rear cowl shape.
Data Source
AI summary
To elongate an exhaust tail pipe wherein a muffler is covered by a rear cowl. An exhaust structure of a vehicle including a rear cowl covering a vehicle rear portion, a rear bank-muffler including a first and second expansion chamber partitioned by a partition, a first and second connecting pipe connecting the expansion chambers, and a tail pipe configured to discharge exhaust air from the rear bank-muffler. The rear bank-muffler is covered by the rear cowl, wherein outlines of the rear bank-muffler and the rear cowl are each formed such that the width decreases toward the vehicle rear. The tail pipe, the first connecting pipe, and the second connecting pipe are provided so as to penetrate the partition. A position where the tail pipe penetrates the partition and positions where the first connecting pipe and second connecting pipe penetrate the partition are offset from each other in the vertical direction.