Sump Pipe Unit Mounting With Play for Tolerance Compensation
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Solution Overview
Problem
Existing sump devices for oil supply in commercial motor vehicles face challenges in economic production, simplified assembly, and maintenance due to component tolerances and precise positioning requirements, particularly in injection molded plastics materials.
Innovation Solution
The pipe unit of the sump device is arranged with play on the sump body, allowing for easier and more reliable connection to fluid lines, compensating for manufacturing inaccuracies, and enabling greater component tolerances, thus simplifying assembly and maintenance while maintaining a secure and functional arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pipe unit is rigidly fixed to the sump body, then the positioning precision is improved, but the assembly difficulty and manufacturing cost increase due to tight tolerances required in injection molding
Solution Approach 1:
The pipe unit is designed with movable capability relative to the sump body through a holding device that permits controlled movement. This dynamic arrangement allows the pipe unit to be positioned with play (movement freedom) while still maintaining functional connection, thereby avoiding the need for tight tolerances in injection molding and simplifying both manufacturing and assembly processes
Solution Approach 2:
The holding device changes the positioning parameter from fixed to movable by introducing play. This parameter change allows the pipe unit to accommodate manufacturing tolerances through controlled movement, eliminating the requirement for high-precision rigid fixation while maintaining assembly simplicity
2Ease of operation
If the pipe unit is arranged with play on the sump body, then the assembly ease is improved, but the positioning precision deteriorates
Solution Approach 1:
The holding device provides a dynamic positioning system where the pipe unit can move within defined limits (play) during assembly, making assembly easier. The dynamic nature of the connection allows for tolerance compensation while maintaining functional positioning accuracy through the controlled movement capability
3Ease of manufacture
If greater component tolerances are used, then the manufacturing cost is reduced, but the connection reliability deteriorates
Solution Approach 1:
The holding device creates a dynamic connection that compensates for larger component tolerances through controlled movement and play. This dynamic adjustment capability ensures reliable sealing and connection even when components are manufactured with greater tolerances, thereby reducing manufacturing costs while maintaining connection reliability
Solution Approach 2:
The holding device changes the connection parameter from rigid to movable, allowing the system to accommodate larger tolerances. This parameter change enables the use of greater component tolerances in manufacturing while maintaining connection reliability through the play and movement freedom provided by the holding device
Data Source
AI summary
In order to improve and in particular to more economically manufacture and/or assemble and/or maintain a sump device comprising a sump body particularly for an oil supply in a commercial motor vehicle having a pipe unit comprising a pipe body wherein the sump body is an injection moulded part of plastics material, it is proposed that the pipe unit be arranged on the sump body with play.