Pneumatic Piston Sealing Lock for High-Load Modulators
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Solution Overview
Problem
Conventional electropneumatic modulators face issues with unreliable sealing actions due to welded joints breaking under high acceleration forces, compromising the piston's ability to withstand high loads.
Innovation Solution
A pneumatic piston with a positively locking connection using a securing element to fix a sealing element in a recess, eliminating the need for welded joints, ensuring reliable sealing and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the covering plate is welded to the piston body or produced by way of staking, then the sealing action is provided between the piston and the housing, but the welded joint breaks under great acceleration forces leading to unreliable sealing
Solution Approach 1:
The securing element is divided into a head portion and a leg portion that are integrally formed as one piece. The leg portion fits into a groove of the piston body, creating a segmented connection structure that distributes mechanical stresses away from the sealing interface, preventing joint failure under acceleration forces while maintaining reliable sealing action.
2Reliability
If conventional welding or staking methods are used to fix the covering plate, then the sealing action is achieved, but the production cost and complexity increase
Solution Approach 1:
The securing element features a self-locking mechanism where the leg portion automatically engages with the groove of the piston body through elastic deformation or geometric interlocking. This self-service design eliminates the need for external welding equipment, staking tools, or additional fastening operations, significantly simplifying the production process while ensuring reliable sealing action.
Data Source
AI summary
A pneumatic piston for an electropneumatic modulator in which the modulator includes a piston housing with a chamber for receiving the pneumatic piston. The pneumatic piston includes a sealing element for sealing an intermediate space between the pneumatic piston and the piston housing; a piston body with a recess for receiving the sealing element; and a securing element configured to fix the sealing element in the recess in a form-fitting manner.