Oil Sump Drip Projection Prevents Teapot Effect
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Solution Overview
Problem
The 'teapot effect' occurs when draining engine oil from an oil sump, causing the oil to flow back onto the sump's outer surface due to adhesive forces, leading to soiling and undesired wetting.
Innovation Solution
An oil sump design featuring an oil sump drip projection that protrudes at least 2 mm from the adjacent environment, tapering from a base to a tip, and an oil drip rib arranged adjacent to the drip projection, both positioned to collect and detach engine oil under gravity, preventing it from wetting the sump's outer surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the oil drain plug is arranged horizontally in the oil sump, then the oil drainage is improved, but the engine oil flows back onto the oil sump outer surface due to adhesive forces, causing soiling and wetting
Solution Approach 1:
The patent introduces an intermediary structure (drip projection or drip edge) between the oil drainage channel and the oil sump outer surface. This intermediary element intercepts the oil flow, causing it to detach from the outer surface through gravity and surface tension effects, thereby preventing the harmful adhesion of oil to the sump surface while maintaining efficient drainage
Solution Approach 2:
The invention adds a vertical dimension to the oil drainage path by creating a drip projection or drip edge that extends outward from the oil sump outer surface. This dimensional change allows oil to detach in a downward direction under gravity, separating the horizontal drainage flow from the vertical detachment action, thus preventing surface soiling
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 effectively reduces or prevents the wetting of the oil sump's outer side by ensuring engine oil accumulates and detaches from the drip projection and rib, thereby improving the flow and drainage of engine oil.
Implementation Method 1
both positioned to collect and detach engine oil under gravity
Implementation Method 2
the action of the adhesive power between the issuing engine oil and the outer surface of the oil sump exceeds, at least in part, the discharging effect
Data Source
AI summary
An oil sump with an oil drain channel for a motor vehicle has an oil sump wall with an oil sump inner side. The oil sump inner side delimits an oil sump storage space at least in some sections. The oil sump wall has an oil sump outer side, which faces an environment surrounding the oil sump. The oil sump further has two states, with, in the first state, a liquid medium being receivable and storable in the oil sump storage space, and in the second state, the oil sump storage space being fluidically connected to the environment surrounding the oil sump such that a liquid medium received can exit through the oil drain channel in an oil drain direction into the environment. The oil drain channel has an oil channel extension direction at least in the region of the transition from the oil sump wall into the environment surrounding the oil sump, which oil channel extension direction forms an angle of more than 85° and less than 95° in relation to a direction of the force of gravity, based on a correct installation position of the oil sump. An oil sump drip lug is arranged on the oil sump outer side, adjacently to the oil drain channel and protrudes at least 1 mm relative to an environment directly adjacent to the oil sump outer side.