Threadless Magnetic Oil Drain Plug Design
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Solution Overview
Problem
The repetitive screwing and unscrewing of threaded oil drain plugs leads to wear and damage, causing leaks, environmental hazards, and costly repairs, as well as potential engine damage due to improper installation or thread damage.
Innovation Solution
A threadless magnetic oil drain plug with a magnetic body and a sealing mechanism, including a stem with a detent mechanism and a compliant member, that securely attaches to the oil pan using magnetic forces and spring plungers to prevent leaks and facilitate easy removal and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If threaded drain plugs are repeatedly screwed and unscrewed, then the drain plug can be removed and reinstalled multiple times, but the threads become worn and damaged causing leaks and failures
Solution Approach 1:
The invention extracts the threaded connection system from the drain plug design. Instead of using threads on the drain plug that wear and damage, the plug uses a smooth cylindrical body that inserts into a threaded insert in the oil pan. This separates the threading function (located in the stationary oil pan insert) from the moving drain plug, eliminating thread wear on the plug itself and allowing unlimited removal/installation cycles without degrading plug thread integrity.
2Ease of operation
If threaded drain plugs are over tightened or cross-threaded, then the drain plug can be installed, but the threads are damaged causing leaks and accidental oil spills
Solution Approach 1:
The threaded connection is extracted from the moving plug and placed solely in the stationary insert in the oil pan. The drain plug has a smooth cylindrical insertion surface without threads, eliminating the possibility of cross-threading or thread damage during installation. The threaded insert remains in the oil pan and guides the plug insertion, ensuring proper alignment and preventing damage while maintaining installation simplicity.
3Reliability
If the drain hole is sealed with a threaded insert and threaded plug, then the oil can be retained in the pan, but the threads wear out requiring replacement of the entire oil pan which is costly and time consuming
Solution Approach 1:
The threading function is extracted from the oil pan structure and consolidated into a separate threaded insert component. The drain plug itself becomes threadless with a smooth cylindrical body. When wear occurs, only the inexpensive drain plug needs replacement, not the entire costly oil pan. The threaded insert remains permanently installed in the oil pan and can accommodate multiple plug replacements without requiring pan replacement.
Solution Approach 2:
The drain plug is designed as a disposable or easily replaceable component without threads, while the threaded insert is a durable permanent component in the oil pan. This allows the inexpensive plug to be replaced multiple times while the expensive oil pan and its insert remain in service, significantly reducing repair costs and time compared to replacing the entire pan when thread wear occurs.
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 solution eliminates thread wear and damage, reduces the risk of oil spills, and allows for quick and safe oil changes without the need for thread replacement, while being tamper-resistant and cost-effective.
Implementation Method 1
magnetic forces emanating from the magnetic body releasably attach the plug to an oil pan
Implementation Method 2
a pair of projections is provided, each projection being resiliently urged from its retracted position toward its extended position
Data Source
AI summary
A threadless oil plug is provided for threadlessly sealing a drain hole of an oil pan. The plug has a disc-shaped magnet and a cylindrical stem that projects outwardly from the magnet. A gasket is fastened around the stem in juxtaposition with a planar surface of the magnet. The stem is adapted for insertion into the drain hole of an oil pan, thereby centering the magnet and magnetically sealing the gasket around the drain hole. A removal tool has a hand grip with a splash guard. The hand grip and the splash guard are attached to a magnet. To remove the plug, the magnet of the removal tool is magnetically fastened to the magnet of the plug so that the plug may be safely removed from the drain hole in one motion. The plug is reinstalled in the drain hole in one motion, without the use of any tools.