Motor Vehicle Filler Neck Ventilation Channel Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing filler necks face a trade-off between increasing venting capacity and reducing spitback and splashback during the filling of motor vehicle operating fluid containers, as larger venting capacities lead to increased liquid escape.
Innovation Solution
The filler neck design features a ventilation channel that is separate from the filling channel, with a radial wall separating the venting channels, allowing for increased venting capacity without enhancing spitback or splashback, and includes material recesses to enhance ventilation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the venting capacity of the filler neck is increased by enlarging the cross-sectional area of venting channels, then the filling time is reduced, but spitback and splashback increase leading to liquid escape
Solution Approach 1:
The filler neck is divided into functionally separate channels: a filling channel for liquid intake and multiple venting channels for gas discharge. This segmentation allows independent optimization of each channel's dimensions and flow characteristics, enabling high venting capacity without compromising filling performance or causing liquid escape
Solution Approach 2:
Different regions of the filler neck are designed with different properties: the venting channels have specific cross-sectional areas optimized for gas flow, while the filling channel maintains properties suitable for liquid flow. The material recesses in the inner wall create localized modifications that enhance venting efficiency without affecting the filling channel's liquid-tight characteristics
2Productivity
If the cross-sectional area of venting channels is increased to reduce filling time, then venting capacity improves, but the nozzle diameter must be reduced which causes operating liquid film formation due to capillary effect
Solution Approach 1:
The filler neck is divided into functionally separate channels: a filling channel for liquid intake and multiple venting channels for gas discharge. This segmentation allows independent optimization of each channel's dimensions and flow characteristics, enabling high venting capacity without compromising filling performance or causing liquid escape
Solution Approach 2:
Different regions of the filler neck are designed with different properties: the venting channels have specific cross-sectional areas optimized for gas flow, while the filling channel maintains properties suitable for liquid flow. The material recesses in the inner wall create localized modifications that enhance venting efficiency without affecting the filling channel's liquid-tight characteristics
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
This design achieves improved venting properties with reduced liquid escape during filling, allowing for faster filling while minimizing spitback and splashback, and enables the use of nozzles with different diameters, enhancing standardization and mechanical stability.
Implementation Method 1
If the nozzle diameter is too small, an operating liquid film can also form between the profile crests of the grooves and the nozzle valve due to the capillary effect
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a filler neck for an operating-liquid tank (3) for a motor vehicle. The filler neck (1) comprises a mouth-hole neck (11), into which a nozzle can be inserted in order to fill the operating-liquid tank (3). A ventilation path is provided in the filler neck (1), which ventilation path allows a ventilation flow parallel and oppositely to the filling volumetric flow through the mouth-hole neck (11) during filling. The filler neck (1) according to the invention is characterized in that the ventilation path comprises at least one ventilation channel (18) provided in a wall arrangement (14) of the mouth-hole neck (11), which at least one ventilation channel is at least partially surrounded by an outer wall (14a) and an inner wall (14b) of the wall arrangement (14) along the longitudinal extent of the at least one ventilation channel.