Urea Water Tank Layout for Rough Terrain Crane SCR System
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Solution Overview
Problem
In large rough terrain cranes, the urea water tank layout poses challenges in maintaining optimal temperature and compactness, especially in low-temperature environments, and requires special measures to prevent freezing and degradation, while ensuring efficient supply and easy filling without compromising small-radius turning performance and visibility.
Innovation Solution
The urea water tank is positioned on the front side of the exhaust emission control device, adjacent to the engine, with a protective frame that functions as a step for the operator and includes an insulation member, allowing for efficient heating and compact layout, simplifying piping, and enabling easy attachment and detachment of outriggers and booms without lengthening the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the urea water tank is positioned away from the engine, then the exhaust emission control device can be laid out independently, but the vehicle body length increases and small-radius turning performance deteriorates
Solution Approach 1:
The patent combines the urea water tank with the engine compartment by positioning it on the front side of the exhaust emission control device adjacent to the engine. This merging of components allows the exhaust emission control device to be laid out in a compact configuration without extending the vehicle body length, thereby maintaining small-radius turning performance while facilitating independent layout of the exhaust system.
2Ease of manufacture
If the urea water tank is positioned in the rear of the vehicle, then the exhaust emission control device can be laid out, but the urea water may freeze in low-temperature environments
Solution Approach 1:
The patent introduces an insulation member as an intermediary between the urea water tank and the external environment. This insulation member surrounds the urea water tank to prevent heat loss and protect the urea water from freezing in low-temperature environments, thereby ensuring reliable operation of the exhaust emission control system regardless of tank position.
3Device complexity
If the urea water tank is positioned without insulation, then the layout is simpler, but the urea water degrades in high-temperature environments
Solution Approach 1:
The insulation member serves as a protective intermediary that surrounds the urea water tank, preventing excessive heat transfer from the engine or external environment. This maintains the urea water quality by preventing degradation in high-temperature environments while allowing flexible layout configuration.
4Reliability
If the protective frame is added around the urea water tank, then the tank is protected and can serve as an operator step, but the device complexity increases
Solution Approach 1:
The protective frame surrounding the urea water tank is designed to serve multiple functions: it protects the tank from physical damage, provides structural support, and creates a step for operators to access the cab or perform maintenance. By making the protective frame multi-functional, the patent reduces the need for separate components, thereby minimizing the increase in device complexity while achieving multiple benefits.
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 ensures efficient supply of urea water to the SCR, maintains optimal temperature, and allows for compact and flexible layout without compromising turning performance or visibility, meeting strict exhaust gas regulations and preventing urea water degradation.
Implementation Method 1
The protective frame includes an insulation member, allowing for efficient heating and compact layout
Implementation Method 2
The urea water tank is positioned on the front side of the exhaust emission control device, adjacent to the engine
Implementation Method 3
The urea water tank is positioned on the front side of the exhaust emission control device, adjacent to the engine
Data Source
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AI summary
[Subject] To provide an SCR-quipped rough terrain crane in which a urea water tank is laid out at the optimal position. [Solution] A rough terrain crane 10 is equipped with an exhaust emission control device 30 that is laterally adjacent to a diesel engine 20. The exhaust emission control device 30 is provided with a urea water tank 50 and is laid out in a rear portion of at a vehicle body. The urea water tank 50 is disposed on a front side of the exhaust emission control device 30. The urea water tank 50 is disposed in the vicinity of the left side of the diesel engine 20 when viewed from the rear side of the vehicle.