V-Type Engine Exhaust Layout With Bank-Mounted Catalysts
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Solution Overview
Problem
Conventional V-type engine exhaust purifying devices result in a larger engine size and reduced flexibility for muffler placement due to the positioning of catalytic converters away from cylinder banks, and the fixed nature of mufflers, which limits compactness and adaptability.
Innovation Solution
A V-type engine design featuring detachably connected mufflers and catalysts arranged along the outer surfaces of cylinder banks, with compactly integrated exhaust pipes and a merging pipe system that allows for flexible muffler placement and reduced engine size, including a divided upstream and undivided downstream pipe structure for optimal exhaust gas expansion and cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catalytic converter is positioned away from the cylinder banks, then the exhaust purification function is achieved, but the engine size becomes larger
Solution Approach 1:
The catalytic converter is divided into multiple catalysts that are separately positioned along the outer surfaces of the first and second cylinder banks. This segmentation allows the catalytic function to be distributed closer to the exhaust sources (cylinder banks) rather than requiring a single centralized converter, thereby reducing overall engine size while maintaining purification effectiveness.
Solution Approach 2:
The catalysts are arranged along the outer surfaces of the cylinder banks in a spatial distribution that utilizes the available engine volume more efficiently. By positioning catalysts in multiple locations along the cylinder bank surfaces rather than concentrating them in one location, the design achieves effective exhaust purification within a compact engine footprint.
2Stability of the object's composition
If the muffler is fixed to the primary exhaust passage by welding, then the exhaust system is structurally stable, but the flexibility for setting the muffler is reduced
Solution Approach 1:
The muffler connection method transitions from a fixed welded joint to a detachable connection system. This allows the muffler to be dynamically repositioned or removed based on different application requirements, while still providing stable exhaust system operation during use. The detachable nature enables flexibility in muffler placement without compromising structural integrity during operation.
Solution Approach 2:
The connection parameters between the muffler and exhaust passage are changed from permanent (welding) to detachable (bolts or other removable fasteners). This parameter change maintains structural stability during operation while enabling flexibility in muffler positioning and installation, allowing the exhaust system to adapt to different mounting configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances muffler flexibility, achieves a more compact engine configuration, optimizes exhaust gas temperature for catalysts, lowers manufacturing costs, and improves engine output by maintaining a lower intake air temperature through strategic component placement.
Implementation Method 1
a first catalyst (32a) accommodated in the first exhaust pipe; a second catalyst (32b) accommodated in the second exhaust pipe
Data Source
AI summary
A V-type engine includes an engine body including a crankcase configured to rotatably support a crankshaft, and a first and second cylinder banks extending from the crankcase, a first exhaust pipe connected to the first cylinder bank; a second exhaust pipe connected to the second cylinder bank; a merging pipe connected to the first and second exhaust pipes; a first catalyst accommodated in the first exhaust pipe; a second catalyst accommodated in the second exhaust pipe; and a muffler detachably connected to the merging pipe, wherein the first catalyst is arranged along an outer surface of the first cylinder bank, and the second catalyst is arranged along an outer surface of the second cylinder bank.