Work Vehicle Exhaust Purification Case Mounting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The assembly and maintenance of diesel particulate filter (DPF) and selective catalytic reduction (SCR) cases in engine devices for work vehicles are hindered by temperature issues and spatial constraints, leading to inefficient nitrogen oxide purification and difficulties in supporting and installing these components in a compact engine room.
Innovation Solution
The engine device features a first case for particulate matter removal and a second case for nitrogen oxide removal, where the first case is supported on the engine or vehicle frame, and the second case is mounted on the vehicle frame via support bodies, allowing for improved assembly and maintenance workability, and the urea water tank is strategically placed to facilitate fuel and aqueous solution replenishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the DPF case and the SCR case are assembled apart from the engine, then the assembly workability is improved, but the temperature of the exhaust gas supplied to the SCR case is reduced, leading to deteriorated nitrogen oxide purification efficiency
Solution Approach 1:
The exhaust gas purification device is divided into separate DPF case and SCR case that can be assembled independently from the engine, improving assembly workability while maintaining purification efficiency through proper positioning and support structures
Solution Approach 2:
A support body is introduced as an intermediary component between the SCR case and the vehicle body frame, enabling the SCR case to be positioned optimally for both assembly convenience and exhaust gas temperature maintenance, thus resolving the contradiction between ease of assembly and purification efficiency
2Temperature
If the DPF case and the SCR case are assembled in the engine room, then the temperature of the exhaust gas in the SCR case is maintained at high temperature, but the installation space becomes limited and assembly/maintenance workability is deteriorated
Solution Approach 1:
The SCR case is extracted from the engine room and mounted on the vehicle body frame instead, eliminating space constraints and improving assembly/maintenance workability while the support body ensures proper positioning to maintain exhaust gas temperature for effective nitrogen oxide purification
3Ease of manufacture
If the SCR case is mounted on the vehicle body frame via support bodies, then the assembly workability is improved, but the support structure becomes more complex
Solution Approach 1:
The support body is designed with specific local features including a through hole for the exhaust gas passage and positioning protrusions that fit into corresponding recesses, providing the necessary support function with minimal complexity while enabling easy assembly and proper exhaust gas temperature maintenance
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 enhances the support and installation of the SCR case, improves workability, and maintains the urea solution temperature, ensuring effective exhaust gas purification even in limited spaces and cold conditions.
Implementation Method 1
a diesel particulate filter is internally provided
Implementation Method 2
a urea selective reduction catalyst is internally provided
Implementation Method 3
chemical reaction such as the action of selective catalyst reduction
Data Source
Figure 1
Figure 2
Figure 3
AI summary
It is a problem to provide an engine device for a work vehicle configured to miniaturize an engine room (hood) in which an engine 1 is internally disposed, thereby improving assembly workability or maintenance workability of respective cases 28 and 29 of which the external shape is formed in an oblong cylindrical shape. The engine device for a work vehicle is configured to include a first case 28 that removes particulate matter in exhaust gas of an engine 1 and a second case 29 that removes nitrogen oxides in the exhaust gas of the engine 1 and configured to mount the engine 1 on a travelling vehicle-body frame 120 on which right and left running wheels 53 and 54 are arranged, and the engine device has structure in which the first case 28 is supported on the engine 1, and the second case 29 is mounted on the travelling vehicle-body frame 120 via support bodies 121.