Drive Unit Casing Vent Shaft to Protect Membrane Venting
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Solution Overview
Problem
Conventional permeable membranes in drive unit casings are vulnerable to abrasive media and mechanical influences, necessitating extensive protection measures, while air exchange is essential to manage pressure differences due to temperature changes.
Innovation Solution
A shaft within the casing houses the permeable membrane, preventing oil contact and ensuring venting functionality by positioning it away from oil sources, with a configuration that minimizes contact risk and facilitates assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permeable membrane is used for venting in the casing, then air exchange is enabled to manage pressure differences, but the membrane becomes vulnerable to abrasive media and mechanical influences
Solution Approach 1:
The venting function is segmented from the membrane by introducing a shaft structure. The shaft is divided into an outer shaft and an inner shaft, creating a protected chamber that houses the membrane. This segmentation allows the membrane to be isolated from harmful external factors while maintaining the venting function through the shaft structure.
Solution Approach 2:
The shaft structure acts as an intermediary between the membrane and the external environment. The shaft walls and the space between the outer and inner shafts serve as a protective barrier, mediating the interaction between the membrane and harmful factors such as oil and mechanical influences from high-pressure cleaners.
2Productivity
If the membrane is positioned closer to the oil source for better venting, then air exchange efficiency improves, but contact with oil increases causing wetting and damage
Solution Approach 1:
The problem is solved by transitioning from a two-dimensional positioning problem to a three-dimensional solution. Instead of simply moving the membrane closer or farther in a straight line, the shaft creates a vertical dimension with the membrane positioned at the bottom of the shaft chamber. This spatial arrangement allows the membrane to be close to the oil source for efficient venting while the shaft structure prevents direct contact.
3Object-affected harmful factors
If additional protection components are added to the membrane, then membrane protection improves, but device complexity and assembly effort increase
Solution Approach 1:
The protective function is merged with the existing casing structure by integrating the shaft as part of the casing itself. The shaft is formed as a through-opening in the casing, combining the structural, protective, and venting functions into a single integrated component rather than adding separate protective elements.
Solution Approach 2:
The shaft structure serves multiple functions simultaneously: it provides mechanical support for the membrane, protects the membrane from harmful factors, enables the venting function, and serves as an integral part of the casing structure. This multi-functionality reduces the need for additional specialized protection components.
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 effectively protects the membrane from oil and other contaminants, providing a cost-effective and space-optimized venting solution that maintains air exchange without additional components.
Implementation Method 1
a vent (2) that includes a permeable membrane (3) accommodated in a shaft (2) of the casing (1)
Data Source
AI summary
The present invention relates to a casing for a drive unit in which an electric motor and/or a transmission can be arranged. An exhaust ventilation interface is provided on/in the casing and has a permeable membrane, a shaft (2) accommodating the membrane. The invention also relates to a drive unit for a motor vehicle, comprising the casing according to the invention.