Engine Exhaust Purifier Mounting for Vibration Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge is to effectively mount a diesel particulate filter (DPF) on an engine to ensure high exhaust gas temperature for particulate matter restoration while minimizing vibration damage and optimizing space, particularly in compact engine compartments of construction and agricultural machines.
Innovation Solution
The engine apparatus features an exhaust gas purifier with a longitudinal direction orthogonal to the engine's output shaft, supported by a cylinder head near a cooling fan, and utilizing a dual-bracket mounting system with different materials for secure attachment, allowing for compact placement and reduced overall height and width, while maintaining high rigidity and freedom of arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the exhaust gas purifier is directly mounted on the engine, then the exhaust gas temperature is high enough for particulate matter restoration, but vibration from the engine may damage the diesel oxidation catalyst and soot filter
Solution Approach 1:
The patent introduces a mounting bracket as an intermediary component between the engine and the exhaust gas purifier. This bracket serves as a mediator that connects the two components while isolating the purifier from direct engine vibration, thus protecting the catalyst and filter from damage while maintaining the high temperature environment needed for particulate matter restoration.
Solution Approach 2:
The patent extracts the exhaust gas purifier from direct contact with the engine by mounting it on a separate bracket structure. This separation allows the purifier to be positioned in a location that provides both high exhaust gas temperature exposure and protection from engine vibration, effectively removing the harmful vibration factor while preserving the beneficial thermal conditions.
2Weight of moving object
If the exhaust gas purifier is mounted compactly on the engine, then the overall engine size and weight are reduced, but the available space for mounting and maintenance is limited
Solution Approach 1:
The patent positions the exhaust gas purifier in the vertical dimension above the engine, specifically utilizing the space between the head cover and cooling fan. This vertical placement allows for compact horizontal footprint while maintaining accessibility for maintenance operations, effectively using the third dimension to resolve the space-constraint problem.
Solution Approach 2:
The patent divides the engine compartment space into distinct functional zones, allocating specific areas for the exhaust gas purifier, cooling fan, and other components. This segmentation allows each component to be optimally positioned for both compactness and maintainability, with the purifier placed in a dedicated space that does not interfere with other systems.
3Volume of stationary object
If the exhaust gas purifier is positioned close to the cooling fan, then space is optimized, but the cooling fan may interfere with exhaust gas flow or purification performance
Solution Approach 1:
The patent employs asymmetric positioning of the exhaust gas purifier relative to the cooling fan, placing it at a specific offset location that optimizes both space utilization and exhaust gas flow paths. This asymmetric arrangement ensures that the cooling fan does not directly interfere with the exhaust gas flow into or through the purifier, while still maintaining compact overall dimensions.
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 prevents vibration damage, facilitates maintenance, and reduces the engine's size and weight by effectively utilizing available space, ensuring high purification performance and improved durability of the exhaust gas purifier.
Implementation Method 1
a coolant passage which communicates with the combustion chamber and through which coolant flows
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An engine apparatus includes an exhaust gas purifier configured to purify exhaust gas from an engine. The exhaust gas purifier is mounted on the engine with a longitudinal direction of the exhaust gas purifier being orthogonal to an output shaft of the engine. A cooling fan is disposed on one side surface of the engine that intersects the output shaft. The exhaust gas purifier is supported by a cylinder head at a portion on an upper surface of the engine that is closer to the cooling fan.