Exhaust Pipe Catalyst Integration for Outboard Motor Engines
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Solution Overview
Problem
Existing outboard motor engines face challenges in accommodating a catalyst due to insufficient space in the exhaust manifold and cylinder block, requiring significant shape modifications to accommodate the catalyst, which increases the number of components and complexity.
Innovation Solution
The design incorporates a cylinder block with multiple passages in the exhaust manifold and an exhaust pipe that connects these passages, allowing exhaust gases to flow through the pipe and return to the manifold, enabling the catalyst to be placed within the pipe for purification, thus minimizing the number of components to be modified.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the catalyst is mounted in the exhaust manifold of conventional engines, then exhaust gas purification is achieved, but the engine shape must be greatly changed due to insufficient space
Solution Approach 1:
The invention extracts the catalyst from the exhaust manifold and relocates it to a separate exhaust pipe component. This separation allows the catalyst to be installed without modifying the engine's cylinder block or exhaust manifold shapes, thereby achieving exhaust gas purification while maintaining the original engine structure.
Solution Approach 2:
The invention introduces a connection passage as an intermediary element between the exhaust manifold and the catalyst-containing exhaust pipe. This connection passage serves as a mediator that connects the existing exhaust manifold to the new catalyst installation location, enabling catalyst integration without direct modification to the engine structure.
2Object-affected harmful factors
If the catalyst is mounted using a side-surface member beside the cylinder block, then exhaust gas purification is achieved, but the cylinder block, exhaust manifold, and engine holder shapes must be changed
Solution Approach 1:
The invention extracts the catalyst from the complex multi-component integration approach (cylinder block + exhaust manifold + engine holder) and relocates it to a standalone exhaust pipe assembly. This simplifies the overall system by concentrating the catalyst installation in a single modular component rather than distributing modifications across multiple structural elements.
3Object-affected harmful factors
If the exhaust manifold shape is modified to accommodate the catalyst, then catalyst installation is enabled, but the number of components to be changed increases
Solution Approach 1:
The invention extracts the catalyst from the exhaust manifold and places it in a separate exhaust pipe, thereby eliminating the need to modify the exhaust manifold shape or structure. This reduces the number of components that require manufacturing changes from multiple engine parts to just the exhaust pipe assembly.
Solution Approach 2:
The invention segments the exhaust system into distinct functional modules: the existing exhaust manifold remains unchanged, while the catalyst is installed in a separate exhaust pipe section. This segmentation allows independent manufacturing and assembly of the catalyst-containing exhaust pipe without affecting other engine components.
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 configuration allows for the addition of a catalyst to conventional engines with minimal modifications, improving exhaust gas purification and reducing the risk of leaks by maintaining dimensional accuracy and sealability between the exhaust pipe and manifold.
Implementation Method 1
a catalyst 40 disposed in the connection passage 50
Data Source
AI summary
An engine includes a cylinder block including a plurality of cylinders, an exhaust manifold, and an exhaust pipe. The exhaust manifold includes a first passage and a second passage. The first passage includes a plurality of first inflow ports into which exhaust gases flow from the plurality of cylinders, a first collecting portion that collects exhaust gases that have flowed into the plurality of first inflow ports, and a first exhaust port through which exhaust gases collected by the first collecting portion are discharged. The second passage includes a second inflow port into which exhaust gases flow and a second exhaust port through which exhaust gases that have flowed into the second inflow port are discharged. The exhaust pipe includes a connection passage through which the first exhaust port and the second inflow port are connected together.