Pneumatic Control Valve Elastomer Piston Sealing
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Solution Overview
Problem
Existing pneumatic control valves in compressed-air brake systems face issues with sealing impairment due to tilting moments and transverse forces, leading to increased wear and reduced effectiveness, particularly in the housing upper part where the first valve piston is guided by a cylindrical guide sleeve, requiring a longer installation space and potentially compromising sealing action.
Innovation Solution
The integration of a single-piece elastomer spring element and first valve piston configuration, where the elastomer material engages radially and axially in a positively locking manner around the valve piston, combined with a frustoconical design and specific Shore hardness regions for resilient support and sealing, reduces the impact of tilting moments and transverse forces, allowing for a shorter valve piston and improved sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cylindrical guide sleeve with large axial length is used to guide the first valve piston, then the valve piston can withstand tilting moments and transverse forces, but the installation space required in the housing upper part becomes rather long
Solution Approach 1:
The guide sleeve is divided into two separate components: a short guide sleeve that provides guidance and a separate bearing element (such as a bushing or bearing) that absorbs the tilting moments and transverse forces. This segmentation allows each component to be optimized for its specific function, reducing the overall axial length while maintaining the ability to withstand loads.
Solution Approach 2:
A bearing element is introduced as an intermediary component between the guide sleeve and the housing. This bearing element specifically handles the tilting moments and transverse forces, allowing the guide sleeve to be shorter while still providing adequate guidance and load-bearing capability.
2Device complexity
If tilting moments and transverse forces are transmitted directly to the cylindrical guide of the valve piston, then the structure remains simple, but the sealing action of the O-ring seal is reduced due to increased wear
Solution Approach 1:
A bearing element is introduced as an intermediary component between the guide sleeve and the housing. This bearing element specifically handles the tilting moments and transverse forces, allowing the guide sleeve to be shorter while still providing adequate guidance and load-bearing capability.
Solution Approach 2:
The function of absorbing tilting moments and transverse forces is extracted from the guide sleeve and assigned to a separate bearing element. This extraction protects the O-ring seal from these harmful forces, reducing wear and maintaining sealing effectiveness.
3Length of moving object
If the guide sleeve axial length is reduced to decrease installation space, then the overall length is reduced, but the ability to absorb tilting moments and transverse forces is compromised
Solution Approach 1:
The guide sleeve is divided into two separate components: a short guide sleeve that provides guidance and a separate bearing element (such as a bushing or bearing) that absorbs the tilting moments and transverse forces. This segmentation allows each component to be optimized for its specific function, reducing the overall axial length while maintaining the ability to withstand loads.
Solution Approach 2:
A bearing element is introduced as an intermediary component between the guide sleeve and the housing. This bearing element specifically handles the tilting moments and transverse forces, allowing the guide sleeve to be shorter while still providing adequate guidance and load-bearing capability.
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 configuration minimizes the effects of tilting moments and transverse forces on the valve piston, enabling a more reliable sealing action with reduced wear and a compact, lightweight design, facilitating easier assembly and operation.
Implementation Method 1
an elastomer spring element and the first valve piston are configured in one piece as a composite component, and that, in the region of a radial sealing lip of the elastomer spring element, the material of the elastomer spring element engages radially and axially in a positively locking manner around a radially outer section of the first valve piston
Data Source
AI summary
Pneumatic control valve of a vehicle air brake system, having at least one first valve system which is arranged in a housing upper part with a first valve piston which can be actuated via an elastomer spring element, and having a second valve system which is arranged in a housing lower part with a coaxially arranged second valve piston which can be actuated by the first valve system and with a second annular plate valve. The elastomer spring element and the first valve piston are configured in one piece as a composite component. In the region of a radial sealing lip of the spring element, the material of the elastomer spring element engages radially and axially in a positively locking manner around a radially outer section of the first valve piston.