Cylinder-Piston Sealing Structure Without Separate Rings or Guide Bands
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Solution Overview
Problem
Existing cylinder-piston devices require laborious manufacturing and assembly of sealing rings and guide bands, and are susceptible to damage, leading to sealing losses and reduced functionality.
Innovation Solution
A cylinder-piston device with a piston featuring radially extending outer sections that provide both sealing and guiding functions, eliminating the need for grooves and manual assembly of separate sealing devices, where the outer sections are designed to interact with the cylinder's inner coating for enhanced sealing and guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing rings and guide bands are used in conventional cylinder-piston devices, then sealing and guiding functions are provided, but manufacturing and assembly become laborious and complex
Solution Approach 1:
The patent merges the sealing function and guiding function into a single integrated piston design. The piston features an outer contour with at least two outer sections extending to different distances in the radial direction, where the sealing and guiding actions occur at different radial positions without requiring separate components. This eliminates the need for separate sealing rings and guide bands, significantly simplifying assembly while maintaining reliable sealing.
Solution Approach 2:
The piston is designed to perform multiple functions simultaneously: the first outer section provides sealing action against the coated inner surface of the cylinder, while the second outer section provides guiding action. This multi-functional design allows a single component to replace multiple specialized components, reducing assembly complexity and improving manufacturing efficiency.
2Device complexity
If sealing rings with small axial extension are used, then the device structure is simplified, but they become susceptible to damage and sealing effectiveness is reduced
Solution Approach 1:
The patent transitions from relying solely on axial extension for sealing (single dimension) to utilizing radial extension as well. The outer sections extend radially outward to different distances, creating a two-dimensional sealing approach where the radial dimension provides additional sealing path and damage tolerance. This allows the sealing sections to be more robust and less susceptible to damage while maintaining structural simplicity.
3Reliability
If grooves are created on the piston outer contour for sealing components, then sealing function is achieved, but manufacturing becomes laborious
Solution Approach 1:
The patent extracts the sealing and guiding functions from separate groove-based components and integrates them directly into the piston's outer contour. By eliminating the need for grooves to accommodate separate sealing rings and guide bands, the manufacturing process is simplified to primarily require forming the specific outer section geometries, which can be achieved through standard molding or machining processes without labor-intensive groove creation.
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
Simplifies manufacturing and assembly, reduces susceptibility to damage, and maintains effective sealing and guidance, enhancing the overall performance and reliability of the cylinder-piston device.
Implementation Method 1
The outer section or the corresponding elevation extending radially further outward can be in contact with the coated inner surface of the cylinder during piston displacement, thereby providing or reinforcing a sealing and/or guiding effect.
Implementation Method 2
If a sufficiently high pressure is applied to the wall in the recess, a force can be exerted via the wall on the outer section extending radially outward, thus pressing it against the inner wall of the cylinder to seal the corresponding areas of the cylinder-piston assembly.
Implementation Method 3
The outer section extending radially further outward is not a conventional piston seal, nor is it a sealing ring or guide band. Rather, the outer section extending radially further outward can be made of a material that has a sealing effect, particularly in conjunction with the inner coating of the cylinder.
Data Source
AI summary
The invention relates to a cylinder-piston device, comprising a cylinder (1), on the inside of which a seal is provided in the form of a liner, and at least one piston (2), at the radially outer side of which at least two outer sections (27, 28) are provided, which extend to different distances in the radial direction.