Transmission Ventilation Module With Float Valve and Oil Separation
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Solution Overview
Problem
Existing ventilation modules for motor vehicle transmissions fail to prevent water and dirt ingress while ensuring lifelong aeration and ventilation, and they also allow oil droplets to escape into the environment.
Innovation Solution
A ventilation module featuring a float valve with a float chamber, valve body, and valve opening, which closes the gas channel in a liquid-tight manner when liquid enters, combined with an oil separating device like an impact separator to remove oil droplets from vent air before they enter the float chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If venting to the environment is implemented to prevent pressure fluctuations, then pressure stability is improved, but water and dirt can enter the transmission
Solution Approach 1:
A float valve acts as an intermediary mechanism between the transmission interior and the environment. The float valve includes a float that rises with water level and closes a valve opening, preventing water and dirt from entering while allowing gas to pass through during normal operation. This intermediary device resolves the contradiction by selectively blocking harmful substances while maintaining pressure equilibrium.
Solution Approach 2:
The float valve utilizes a float (which can be designed with flexible membranes or shells) that responds to water level changes. The float's flexible structure allows it to seal effectively against the valve opening when water enters, creating a dynamic barrier that adapts to environmental conditions while maintaining the gas pathway during normal operation.
2Object-affected harmful factors
If a hermetic sealing system is used, then protection against water and dirt is improved, but pressure fluctuations increase
Solution Approach 1:
The float valve introduces a dynamic element to the sealing system. Instead of a static hermetic seal, the float valve dynamically opens and closes based on water level conditions. During normal operation, the valve remains open allowing pressure equilibrium; when water enters, the float rises and closes the valve, providing dynamic protection while maintaining pressure stability.
3Ease of manufacture
If simple bore vents are used, then manufacturing simplicity is improved, but oil escape and water ingress occur
Solution Approach 1:
The float valve serves as an intermediary device in the gas channel, transforming a simple bore vent into a controlled pathway. The float valve mechanism selectively allows gas to pass while blocking water and oil through the floating closure action, maintaining relative manufacturing simplicity while eliminating the harmful effects of uncontrolled venting.
4Object-affected harmful factors
If check valves with hydrophobic membranes are used, then water protection is improved, but pressure fluctuations and temperature dependence increase
Solution Approach 1:
The float valve uses buoyancy (an upward force counteracting gravity) as its operating principle. The float rises with water level, automatically closing the valve without requiring spring preload or complex membrane structures. This counterweight-based mechanism eliminates the pressure fluctuations and temperature dependence associated with spring-loaded check valves while maintaining effective water protection.
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 prevents water and dirt from entering the transmission while ensuring that oil droplets are retained, thereby extending the service life of the ventilation component and maintaining the integrity of the transmission's components.
Implementation Method 1
liquid entering the float chamber (34) through the atmosphere opening (21) causes the float (35) to rise
Implementation Method 2
an oil separating device is arranged in the gas channel for separating oil components from vent air flowing from the connection opening to the atmosphere opening
Data Source
AI summary
A ventilation module for a transmission of a motor vehicle, in particular an electrically driven motor vehicle, comprises a housing with a connection opening on the transmission side and an atmosphere opening open to the environment, wherein a gas channel connecting the connection opening to the atmosphere opening in a gas-conducting manner is provided in the housing. A float valve with a float arranged in a float chamber, a valve body and a valve opening is arranged in the gas channel, wherein liquid entering the float chamber through the atmosphere opening causes the float to rise, wherein when a certain liquid level in the float chamber is exceeded the float, the valve body connected to the float, closes the valve opening and thereby the gas channel in a liquid-tight manner.