Segmented Sealing Gasket for Roto-Translatory Motion
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Solution Overview
Problem
Existing sealing gaskets for vehicles with roto-translatory motion fail to maintain effective sealing under severe conditions due to limited spacing between sealing lips, especially in gaskets with reduced radial sections, allowing contaminants to pass through wear areas during axial movement.
Innovation Solution
A self-supporting sealing gasket design featuring distinct sealing rings with adjustable spacing between sealing lips, facilitated by a spacer ring, ensures effective sealing by preventing contaminants from entering the lubricant compartment, even in gaskets with reduced radial thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two sealing lips are arranged at a large axial distance to prevent contaminant passage during axial movement, then sealing effectiveness is improved, but the gasket requires increased radial section which is not available in reduced radial section designs
Solution Approach 1:
The patent transitions from a single sealing ring with two sealing lips to two separate sealing rings, each with one sealing lip. This dimensional reorganization allows the sealing lips to be positioned at the required axial distance apart while maintaining a compact radial profile, effectively resolving the contradiction between sealing effectiveness and radial section constraints.
2Device complexity
If a single sealing ring with two sealing lips is used to seal against contaminants, then the structure is compact, but the spacing between sealing lips is limited preventing adequate sealing under severe conditions
Solution Approach 1:
The patent divides the single sealing ring into two separate sealing rings, each equipped with one sealing lip. This segmentation allows each sealing lip to be optimally positioned for its specific sealing function, with adequate axial spacing between them, while maintaining overall structural compactness through the integrated design of the two rings working together.
3Reliability
If two sealing lips are spaced far apart to account for axial displacement, then contaminant blocking is improved, but the first sealing ring cannot support the lips if radial section is reduced
Solution Approach 1:
By segmenting the sealing function into two separate rings, each ring only needs to support one sealing lip rather than two lips spaced far apart. This dramatically reduces the radial section requirement for each individual ring, making the design manufacturable and supportable even in reduced radial section applications.
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 design allows for increased spacing between sealing lips, enhancing the gasket's durability and effectiveness under severe operating conditions, such as those found in earth-moving machines, by ensuring contaminants are blocked, regardless of radial thickness, and reduces component count for manufacturing and inventory.
Implementation Method 1
a first ring of elastomeric material with a metallic inner core... adapted to cooperate in use with the movable member to counter the passage of lubricant from the first ambient to the second ambient
Implementation Method 2
a first ring of elastomeric material with a metallic inner core... adapted to cooperate in use with the movable member to counter the passage of external contaminants
Implementation Method 3
an annular wiper element, made of polyurethane or elastomeric material, axially interposed between the first and the second sealing ring and having an annular wiping lip adapted to cooperate in use with the movable member to counter the passage of external contaminants towards the first sealing ring
Data Source
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AI summary
It is described a gasket (1, 1') for sealing a compartment (2) between a fixed member (3) and a roto-translatory member (4); the gasket (1, 1') comprises: a metal support ring (10), having an annular fixing portion (11) adapted to be connected to the fixed member (3); first sealing means (12) internally carried by the fixing portion (11) of the support ring (10) in a position adjacent to a first ambient (5) containing lubricant and defining two first annular sealing lips (13) axially spaced to cooperate in use with the roto-translatory member (4) and to counter the passage of lubricant/external contaminants between the first ambient (5) and a second ambient (6) connected with the outside; and second sealing means (14) axially interposed between the first sealing means (12) and the second ambient (6) and defining a second sealing lip (15) axially spaced from the first annular sealing lips (13) and adapted to cooperate with the roto-translatory member (4) to counter the passage of external contaminants towards the first sealing lips (13); the first sealing means (12) comprise two first distinct sealing rings (25), axially arranged side by side and respectively carrying a relative first sealing lip (13).