Directional Valve in Brake Fluid Container Cap
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Solution Overview
Problem
Pressure medium containers in hydraulic motor vehicle brake systems face issues with fluid escape during flooding, leading to increased complexity and production costs due to decentralized filler pipe arrangements and existing venting systems.
Innovation Solution
A valve with directional opening resistances is integrated into the closing cap, featuring a bearing pedestal and support means, allowing air equalization while preventing fluid escape, and is designed to be simple and economic to produce.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the filler pipe is mounted at the front in the driving direction or on a front end of the pressure medium container to enable receiving the filling device, then the filling operation can be performed, but the filler pipe is regularly flooded with pressure medium during driving operation or braking process, causing fluid escape through the closing cap
Solution Approach 1:
The closing cap is equipped with a directional valve that has different opening resistances for different directions. The valve allows air to pass through in both directions for pressure equalization, but creates high resistance to pressure medium flow in the direction toward the filler pipe, effectively preventing fluid escape while maintaining filling capability
Solution Approach 2:
The valve's opening resistance parameter is made direction-dependent. By designing the valve geometry (such as slot orientation and support means positioning), the resistance to flow is significantly higher in the direction toward the filler pipe compared to the opposite direction, allowing the system to differentiate between desired air flow and harmful fluid escape
2Reliability
If complex systems are provided in the closing cap to guarantee venting function and prevent pressure medium escape during flooding, then fluid escape is prevented, but the complexity and production cost of the closing cap increase
Solution Approach 1:
The valve function is integrated directly into the closing cap structure. The closing cap includes a bearing pedestal, a sealing element with an integrated valve, and support means, all molded as a single functional unit. This merging of functions (sealing, venting, and directional flow control) into one component achieves reliable fluid retention without requiring multiple separate parts or complex assembly
Solution Approach 2:
The closing cap serves multiple functions simultaneously: it seals the filler pipe opening, provides pressure equalization through the air passage, and prevents fluid escape through the directional valve mechanism. This multi-functionality is achieved within a single integrated component structure, avoiding the need for separate devices for each function
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 fluid escape while ensuring reliable pressure equalization, reducing complexity and production costs, and is adaptable to different application profiles.
Implementation Method 1
a valve which is arranged resting on a bearing pedestal and having different valve opening resistances depending on direction. In this way the air can still flow in both directions so that a pressure equalization can take place securely
Implementation Method 2
the valve opening resistance may be set higher in the direction of the surrounding atmosphere than in the opposite direction, for example in the direction of a pressure medium chamber inside the pressure medium container. Thus emergence of the pressure medium from the pressure medium container through the valve is effectively prevented
Data Source
AI summary
A pressure medium container for a hydraulic motor vehicle brake system. A pressure medium container is provided including a container casing the interior of which can be filled with a pressure medium via a filler pipe and is closed off by a closure cap fixed to the filler pipe. A sealing element made from an elastomeric material is provided between the filler pipe and a bottom of the closure cap. The sealing element has a valve which rests on a support pedestal arranged on the closure cap is closed in a non-actuated initial state and reaches an opened actuated state under the control of differential pressure, whereby a pressure is equalized between an interior of the pressure medium container and an ambient atmosphere. Direction-dependently, the valve has different valve opening resistances.