Guide Ring Seal for Piston Pump Air Leakage
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Solution Overview
Problem
Existing piston pumps for vehicle brake systems face challenges in optimizing the sealing function between the piston and the cylinder liner, as the existing sealing ring compromises between preventing the passage of liquid and air, leading to suboptimal performance.
Innovation Solution
A guide ring with a seal attached to it, specifically designed to prevent air passage between the piston and the guide ring, allowing the sealing ring to focus solely on liquid sealing, with the seal being made of flexible plastic and attached via injection molding or press-fitting, enhancing the sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate sealing ring is used in addition to the guide ring, then liquid sealing is provided, but device complexity increases
Solution Approach 1:
The seal for air sealing is merged with the guide ring by mounting it directly on the guide ring's outer circumference. This merging reduces the number of separate components compared to using a separate sealing ring assembly.
Solution Approach 2:
The guide ring is given an additional function by mounting the air seal on it, transforming it from a purely guiding component to a component that performs both guiding and air sealing functions.
2Reliability
If the seal is made of flexible plastic and attached via injection molding, then sealing efficiency against air is improved, but manufacturing complexity increases
Solution Approach 1:
The solution uses composite materials by combining a flexible plastic seal with the guide ring through injection molding. This allows the seal to be made from material optimized for air sealing flexibility while being integrally attached to the guide ring.
3Ease of repair
If the seal is press-fitted on the guide ring, then easy exchange of seal is enabled, but manufacturing precision requirements increase
Solution Approach 1:
The press-fit connection creates a dynamic yet precise fit between the seal and guide ring, allowing the seal to be exchanged easily while maintaining the precision required for effective sealing during operation.
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 improves the sealing efficiency by preventing air leakage and reducing mechanical stress on the sealing lip, allowing for better liquid sealing and easier piston movement, while maintaining a single installation step and allowing for easy exchange of the seal.
Implementation Method 1
The seal according to the disclosure is advantageously formed by means of a flexible plastic, in particular an elastomer
Implementation Method 2
In an injection molding process, plastic is liquefied and injected under pressure into a mold
Implementation Method 3
the seal on the guide ring according to the disclosure rests against the piston, and the piston slides past the seal during its movement
Data Source
AI summary
A guide ring for a piston pump of a vehicle brake system includes a body and a seal. The body is configured to movably support a piston of the piston pump in a cylinder liner. The seal is held on the guide ring and configured to inhibit passage of air between the piston and the guide ring during movement of the piston.