Exhaust Purification Device Layout for Vibration Isolation
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Solution Overview
Problem
The challenge is to stabilize the installation of exhaust gas purification devices in work machines like wheel loaders, where the devices are heavy and prone to vibration damage, while also ensuring effective exhaust gas treatment and maintaining engine performance.
Innovation Solution
The exhaust gas purification device is positioned above the engine with a protrusion cover that is openable/closable, orthogonal to the engine's output shaft, and coupled with the machine body frame, incorporating an exhaust temperature increasing mechanism and dual purification devices for particulate matter and nitrogen oxides, with a reducing agent mixing pipe for enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the exhaust gas purification device is arranged in the installation space of the engine, then the device can be installed in limited space, but high-frequency vibration of the engine is transmitted to the exhaust gas purification device causing damage
Solution Approach 1:
A vibration isolation mount is introduced as an intermediary component between the engine and the exhaust gas purification device. This mount absorbs and dampens high-frequency vibrations, preventing them from being transmitted to the purification device while allowing the device to remain in the limited engine installation space.
Solution Approach 2:
The vibration isolation mount provides beforehand cushioning by pre-positioning damping elements that protect the exhaust gas purification device from vibration damage before the vibrations occur during engine operation.
2Reliability
If the exhaust gas purification device is arranged apart from the engine, then vibration influence is suppressed, but the distance from exhaust manifold is extended causing temperature reduction and insufficient particulate matter combustion
Solution Approach 1:
A thermal insulation barrier is introduced as an intermediary element between the hot exhaust manifold and the surrounding environment. This barrier maintains high exhaust gas temperature over the extended distance, enabling sufficient particulate matter combustion while allowing the purification device to be positioned away from vibration sources.
Solution Approach 2:
The extended distance, which initially appears harmful due to temperature loss, is converted into a benefit by using thermal insulation to maintain temperature. This allows the device to be positioned optimally for vibration protection while preserving combustion effectiveness.
3Object-generated harmful factors
If the exhaust gas purification device replaces the silencer, then exhaust gas purification is achieved, but the device becomes markedly heavy affecting stable assembly
Solution Approach 1:
The exhaust treatment system is segmented into separate functional components: the silencer for noise reduction and the exhaust gas purification device for emission control. This segmentation allows each component to be optimized independently, reducing the overall weight compared to a single integrated heavy unit.
Solution Approach 2:
The exhaust gas purification device is designed with multi-functionality, serving both as a purification device and partially as a structural support element. This reduces the need for additional heavy supporting structures, thereby reducing overall system weight while maintaining stable assembly.
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 improves the layout flexibility of the engine and purification devices, reduces vibration damage, maintains effective exhaust gas treatment, and enhances the durability and longevity of the purification system while allowing for easier maintenance.
Implementation Method 1
particulate matter included in the exhaust gas is not sufficiently combusted and removed
Implementation Method 2
exhaust gas purification device configured to purify and treat exhaust gas of the engine
Implementation Method 3
exhaust temperature increasing mechanism
Data Source
Figure 1
Figure 2
Figure 3
AI summary
It is a technical problem to provide an engine device that includes an exhaust gas purification device 2, which can be efficiently arranged in an engine installation space. The engine 1 is arranged on the lower side of a maneuvering seat 219, and a flywheel housing 10 is arranged in such a manner as to be positioned on the front portion side of a travelling machine body 216, and the exhaust gas purification device 2 is arranged on the upper side of the rear of the engine 1. Also, the engine 1 is coupled with an air cleaner 32 that draws in fresh air on the left side thereof. Furthermore, a hood 220 includes a hood cover 229 configured to be openable/closable in the rear thereof and covers the upper portion of the exhaust gas purification device 2.