V-Type Engine Exhaust Pipe Catalyst Nesting
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Solution Overview
Problem
Conventional V-type engine exhaust purifying devices have a catalytic converter positioned away from the cylinder banks, leading to increased engine size, short catalyst length, and reduced flexibility in muffler placement, which hampers exhaust gas purification performance and muffler configuration.
Innovation Solution
A V-type engine design featuring an exhaust collecting pipe with a catalyst extending between the cylinder banks, allowing for a detachable muffler connection and a merging pipe configuration that accommodates the catalyst, optimizing catalyst length and engine compactness while simplifying the engine structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the catalytic converter is positioned away from the cylinder banks, then the engine structure is simplified, but the engine size increases and catalyst length is reduced
Solution Approach 1:
The catalyst is nested within the exhaust collecting pipe, with the exhaust collecting pipe serving as the housing for the catalyst. This nested arrangement allows the catalyst to be positioned close to the cylinder banks while maintaining a compact engine structure, resolving the contradiction between structural simplicity and compact size.
2Device complexity
If the catalytic converter is positioned away from the cylinder banks, then the engine structure is simplified, but the catalyst length becomes short
Solution Approach 1:
The catalyst is nested within the exhaust collecting pipe, allowing it to extend along the pipe length close to the cylinder banks. This arrangement maximizes the catalyst length within the available space while maintaining structural simplicity.
3Strength
If the muffler is fixed to the exhaust collecting pipe by welding, then the connection is strong, but the flexibility for setting the muffler is reduced
Solution Approach 1:
The exhaust system is segmented into modular components: the exhaust collecting pipe with integrated catalyst, and the separately attachable muffler. This segmentation allows the muffler to be detached and repositioned according to different work machine configurations while maintaining a strong connection when attached.
4Reliability
If multiple catalysts are installed in separate exhaust pipes, then the purification coverage is improved, but the device complexity and cost increase
Solution Approach 1:
Multiple exhaust pipes from the cylinder banks are merged into a single exhaust collecting pipe that houses one integrated catalyst. This merging approach maintains effective exhaust gas collection and purification while simplifying the overall system structure and reducing the number of catalysts required.
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, secures sufficient catalyst length for improved exhaust gas purification, and simplifies the engine configuration by reducing the number of catalysts and optimizing pipe structures for better performance and cost-effectiveness.
Implementation Method 1
a catalyst (32) accommodated in the exhaust collecting pipe
Implementation Method 2
a muffler (33) detachably connected to the exhaust collecting 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, an exhaust collecting pipe connected to the first and second cylinder banks, a catalyst accommodated in the exhaust collecting pipe, and a muffler detachably connected to the exhaust collecting pipe, wherein the catalyst extends in a width direction of the engine body from a distal end side of the first cylinder bank to a distal end side of the second cylinder bank.