Vehicular Urea Pump Module With Integrated Defrosting and Sealing
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Solution Overview
Problem
Conventional vehicular urea pump modules face issues such as urea permeation into electrical components, inadequate defrosting, vibration noise, complex structure, and increased manufacturing costs, leading to operational damage and inefficiencies in SCR systems.
Innovation Solution
A vehicular urea pump module design featuring a case with a separation plate and protective plates, a cylindrical heater with PTC elements, a motor with sealing materials, and a gear-type pump for efficient urea discharge and suction, along with improved filtering and sensor precision, and vibration absorption, all integrated for ease of assembly and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional urea pump module is used with separate supply and collection pumps, then urea can be supplied and collected, but the structure becomes complicated and manufacturing costs increase
Solution Approach 1:
The patent combines the urea supply pump and collection pump into a single integrated pump unit. The pump housing contains both the supply chamber and collection chamber with a common drive mechanism, eliminating the need for separate pumps while maintaining both functions. This reduces structural complexity and manufacturing costs while ensuring reliable urea supply and collection.
2Reliability
If the heater performance is increased to improve defrosting, then urea can be defrosted better, but the structure becomes more complex and costs increase
Solution Approach 1:
The heater is designed as a multi-functional component that serves both as a heating element for defrosting urea and as a structural support component within the pump module. The heater assembly integrates thermal protection and structural reinforcement functions, eliminating the need for separate structural components and reducing overall system complexity while maintaining effective defrosting capability.
3Reliability
If sealing structures are added to prevent urea permeation, then component protection is improved, but manufacturing complexity and costs increase
Solution Approach 1:
The patent uses flexible sealing films and gaskets made from urea-resistant materials to prevent urea permeation into electrical components. These thin-film sealing solutions are integrated into the pump housing and component interfaces, providing effective protection while maintaining simple manufacturing processes and avoiding complex multi-layer sealing structures.
4Extent of automation
If thermal fusion assembly is used for major elements, then assembly is automated, but productivity decreases and defective proportion increases
Solution Approach 1:
The pump module is divided into modular segments (pump housing, motor assembly, heater assembly, filter assembly) that can be manufactured separately and assembled through simple mechanical connections. This segmentation allows parallel manufacturing of components, increasing overall productivity while maintaining automation through standardized interfaces and assembly procedures.
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
The design prevents urea permeation, ensures efficient defrosting, reduces vibration noise, simplifies assembly, and enhances the precision of sensors, while maintaining consistent urea supply and reducing manufacturing complexity and defects.
Implementation Method 1
a cylindrical heater including a first sealing material molded over a surface of a cylindrical heat sink coupled with a positive temperature coefficient (PTC) element
Implementation Method 2
a motor including a second sealing material molded over a surface of a hollow stator having a coil wound around an outer-diameter portion
Data Source
AI summary
A vehicular urea pump module includes a structure capable of preventing urea from permeating into electrical elements such as a pump, a heater, and a sensor of the urea pump module; a structure capable of easily defrosting frozen urea; a structure of separating foreign substances; a structure of reducing vibration noise; a structure of enabling the discharge and suction of urea using a single pump; and a structure of increasing the efficiency of assembly for ease of assembly of respective elements.