Rail Brake Cylinder Guide-Seal Ring for Low-Temperature Airtightness
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Solution Overview
Problem
Existing pressure-medium-actuated brake cylinders in rail vehicles face challenges in cost-effectively sealing and guiding the brake piston rod, particularly at extremely low temperatures and with minimal play to maintain reliable sealing.
Innovation Solution
A combined guide and sealing ring is designed as a structural unit, featuring a central guide region flanked by sealing regions. This design ensures reliable sealing and guidance of the brake piston rod, with a metal insert and low-friction guide strip enhancing performance, and a spring element ensuring constant contact of the sealing lip with the piston rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate guide ring and sealing ring are used, then reliable guiding and sealing of brake piston rod is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the guide ring and sealing ring into a single integrated component called a 'guide and sealing ring'. This unified structure performs both guiding and sealing functions simultaneously, reducing the number of parts from two separate rings to one, thereby simplifying the device while maintaining reliable guiding and sealing of the brake piston rod.
Solution Approach 2:
The guide and sealing ring is designed as a multi-functional component that simultaneously provides guiding function (through the guide region with minimal play) and sealing function (through the sealing regions with sealing lips). This single component replaces what previously required two separate components, achieving both functions in one element.
2Manufacturing precision
If minimal play is provided for brake piston rod mounting, then exact coaxial guidance is achieved, but sealing reliability deteriorates due to insufficient compensation for radial movement
Solution Approach 1:
The guide and sealing ring is segmented into distinct functional regions: a central guide region with minimal play for exact coaxial guidance, and sealing regions adjoined on both sides with sealing lips for reliable sealing. This segmentation allows each region to optimize its specific function while working together as a unified component.
Solution Approach 2:
The guide region acts as an intermediary between the sealing regions and the brake piston rod, providing precise coaxial guidance that enables the sealing lips to follow radial movements accurately. The minimal play in the guide region ensures the piston rod remains centered, allowing the sealing regions to maintain reliable contact without excessive clearance.
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 provides reliable and cost-effective sealing and guidance of the brake piston rod, maintaining airtightness down to -50°C and reducing the need for additional lubricants, thus enhancing the operational reliability of rail vehicle brake systems.
Implementation Method 1
a spring element ensuring constant contact of the sealing lip with the piston rod
Implementation Method 2
a metal insert and low-friction guide strip enhancing performance
Data Source
AI summary
A pressure-medium-actuated brake cylinder of a rail vehicle has a housing, a translationally movable brake piston rod extending through a bore in a housing base, a guide ring which is received in the bore, encloses the brake piston rod and is intended for guiding the brake piston rod in the bore, and at least one sealing ring which is received in the bore, encloses the brake piston rod and is intended for sealing an interior of the housing with respect to a space outside the housing, wherein the guide ring and the at least one sealing ring are designed as a guide and sealing ring combined to form a structural unit.