Urea Water Tank Filter Mounting via Sensor Housing Integration
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Solution Overview
Problem
Conventional urea water tanks for construction machines, such as hydraulic excavators, face challenges in filter configuration and replacement, leading to decreased workability and increased costs due to the need for mounting components and careful handling to avoid sensor damage during filter replacement.
Innovation Solution
A urea water tank design featuring a tank body with openings on the top and bottom surfaces, allowing for simple filter installation and replacement, where the filter is formed as a tubular body surrounding the sensor unit and secured using a closing member, eliminating the need for additional mounting components and ensuring easy access without risk to sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter is mounted to the sensor unit using additional mounting components, then the filter can be securely fixed, but the workability deteriorates and assembly cost increases
Solution Approach 1:
The filter mounting function is merged with the sensor unit housing structure. The housing includes an integrated mounting portion that directly secures the filter without requiring separate mounting components, thereby improving workability while maintaining fixation reliability
Solution Approach 2:
The sensor unit housing serves multiple functions: it protects the sensor, provides structural support, and includes an integrated mounting portion for the filter. This multi-functionality eliminates the need for additional dedicated mounting components
2Reliability
If the bag shaped filter is disposed to wrap the sensor unit, then the filter can surround the sensor, but the filter replacement work becomes complicated and time-consuming due to careful handling requirements
Solution Approach 1:
The filter housing structure is segmented into a removable filter portion and a stationary housing portion. This allows the filter to be independently accessed and replaced without removing or disturbing the sensor unit, significantly reducing replacement time while maintaining sensor protection
Solution Approach 2:
The filter is extracted from the wrapping configuration and repositioned to be mounted on the housing. This extraction allows the filter to be replaced independently without careful handling concerns, while the sensor unit remains protected within its housing
3Reliability
If the filter is configured to wrap the sensor unit, then the filter can filter urea water, but the overall device complexity increases due to additional mounting components
Solution Approach 1:
The filter mounting structure is merged with the sensor unit housing. The housing includes an integrated mounting portion that directly secures the filter, eliminating the need for separate mounting components and reducing device complexity while maintaining filtration reliability
Solution Approach 2:
The housing structure serves multiple functions including sensor protection, structural support, and filter mounting. This multi-functionality reduces the number of separate components needed, thereby simplifying the overall device structure while ensuring proper filtration
Data Source
AI summary
A urea water tank (11) is provided with a unit insertion opening (12H) that is disposed on a top surface part (12A) of a tank body (12) and opens more largely than an external dimension (D2) of a sensor unit (20), a sensor mounting member (16) that is disposed on the top surface part (12A) of the tank body (12) and closes the unit insertion opening (12H), and a filter which is formed as a tubular body to surround the sensor unit (20), and inserted in the unit insertion opening (12H) of the tank body (12) from a lower end (24A4)-side, and having an upper end (24A3) mounted on the top surface part (12A) of the tank body (12) by using the sensor mounting member (16).