Primary Gasket Central Lip Openings for Stable Fluid Communication
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Solution Overview
Problem
Existing primary gaskets in cylinder assemblies for hydraulic and electrohydraulic systems are prone to excessive bending and rotation, leading to fluid passage obstruction and compromised operation due to overstressing in the fluid communication configuration.
Innovation Solution
A primary gasket design featuring a central lip with radial openings to ensure stable abutment against the radial wall, reducing bending and maintaining low fluid resistance, comprising an annular body with inner, central, and outer lips, and a back portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the primary gasket is designed with a three-lip structure (inner lip, central lip, outer lip) to enable fluid isolation and communication functions, then the gasket can fulfill its sealing and pressure control requirements, but the central lip and outer lip can bend excessively when overstressed in the fluid communication configuration
Solution Approach 1:
The central lip is segmented by introducing radial openings that divide it into multiple radial segments. This segmentation reduces the bending moment on each segment while maintaining the overall sealing function, preventing excessive bending and rotation of the central lip when overstressed
Solution Approach 2:
The primary gasket is constructed from composite material comprising a resilient base material (such as rubber or elastomer) reinforced with radial openings in the central lip. This composite structure provides both the flexibility needed for sealing and the structural integrity to prevent excessive bending
2Adaptability or versatility
If the central lip bends excessively due to overstressing, then the primary gasket can switch between fluid isolation and communication configurations, but the bending can lead to rotation of the primary gasket in the primary housing
Solution Approach 1:
The radial openings segment the central lip into multiple independent radial segments that can deflect locally without causing rotation of the entire gasket. This localized flexibility allows configuration switching while maintaining stable positioning in the housing
Solution Approach 2:
The radial openings are pre-designed to counteract the bending moment that would otherwise cause rotation. By providing these openings in advance, the gasket is pre-equipped to resist rotation while maintaining its ability to switch between configurations
3Reliability
If the primary gasket is designed to seal tightly between the float and housing, then fluid isolation is achieved, but fluid resistance increases when in the fluid communication configuration
Solution Approach 1:
The radial openings are localized specifically in the central lip region where fluid communication is required. This creates local quality differentiation: the inner and outer lips maintain tight sealing with the float and housing respectively, while the central lip with radial openings provides low-resistance fluid passage paths
Data Source
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AI summary
The present invention relates to a primary gasket (1) for a cylinder assembly (100), wherein said cylinder assembly (100) comprises a cylinder (101) and a float (102) slidingly accommodated in a float housing (104) delimited by a cylinder wall (103) of said cylinder (101) for pressurizing a fluid, wherein the primary gasket (1) comprises an annular body (2), which extends circumferentially at least along a circumferential direction (C-C) about an axial direction (X-X), wherein said primary gasket (1) defines a radial direction (R-R) perpendicular to said axial direction (X-X) and said circumferential direction (C-C), wherein said annular body (2) is configured to be accommodated in a primary gasket housing (105) defined in said cylinder wall (103), wherein the primary gasket housing (105) is delimited radially by an axial housing wall (107) and axially by a first radial housing wall (108) and a second radial housing wall (109) connected to said axial housing wall (107), wherein said annular body (2) comprises an inner lip (4), a central lip (5), an outer lip (6), and a back portion (3), wherein the back portion (3) comprises a back abutment surface (13) configured to abut against the first radial housing wall (108) of said primary gasket housing (105),wherein the inner lip (4), the central lip (5), and the outer lip (6) extend axially from the back portion (3), on the side opposite to the back abutment surface (13), radially spaced apart from one another, wherein the inner lip (4) is configured to form a seal with said float (102), wherein the outer lip (6) is configured to form a seal with said axial housing wall (107), wherein the central lip (5) comprises an annular lip body (14), which extends axially between said back portion (3) and a central lip edge (15), wherein the annular lip body (14) has a central lip thickness (S) along said radial direction (R-R), wherein the central lip edge (15) comprises at least one central lip abutment portion (7) configured to abut against the second radial wall (109), wherein the central lip (5) comprises at least one radial opening (9), wherein said at least one radial opening (9) passes through the central lip thickness (S) defining a closed side opening profile (8) in said annular body (14).