Reciprocating Sealing Ring with Curved Sliding Portion
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Solution Overview
Problem
Sealing rings for reciprocating motion in motor vehicles and industrial machines face challenges in achieving low friction, high durability, and resource/energy efficiency, as existing designs like O-rings and D-rings do not adequately reduce friction and tension forces.
Innovation Solution
A sealing ring with a circular arc cross-sectional sliding portion and concave surfaces on both side surfaces and the back surface, where the radius of curvature (R) is between A/2 and 13A2, and the concave surface depth is between 0.5A and A, to reduce friction coefficient and tension force, enhancing oil film formation and reducing surface pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional sealing ring (O-ring or D-ring) is used for reciprocating motion, then the structure is simple and cost is low, but the friction force is high and energy consumption increases
Solution Approach 1:
The sealing ring incorporates a sliding portion with a circular arc cross-sectional shape (curved surface) instead of a flat surface. This curvature enables the formation of a hydrodynamic oil film during reciprocating motion, reducing direct contact friction between the sealing ring and the counterpart surface, thereby lowering energy consumption while maintaining structural simplicity
Solution Approach 2:
The invention optimizes specific geometric parameters of the sealing ring: the radius of curvature R of the sliding portion is set within A/2 ≤ R ≤ 13A/2, and the depth of concave surfaces is set within 0.5A ≤ depth ≤ A, where A is the axial width. These parameter optimizations ensure effective oil film formation and friction reduction without complicating the manufacturing process
2Device complexity
If a conventional sealing ring is used for reciprocating motion, then the design is simple, but the tension force acting on the sealing ring is high reducing durability
Solution Approach 1:
The circular arc cross-sectional shape of the sliding portion distributes the contact pressure more evenly during reciprocating motion, reducing peak tension forces on the sealing ring material. This curvature design maintains structural simplicity while significantly improving durability by reducing stress concentration
Solution Approach 2:
The invention introduces concave surfaces at specific locations (axial sides and/or back surface) of the sealing ring cross-section. These localized concave features modify the stress distribution and reduce tension forces precisely where needed, without requiring complex overall redesign of the sealing ring structure
3Ease of manufacture
If a conventional sealing ring is used, then manufacturing is easy, but friction coefficient is high increasing energy consumption
Solution Approach 1:
The circular arc cross-sectional shape of the sliding portion creates a hydrodynamic effect during reciprocating motion, generating an oil film that separates the sealing ring from the counterpart surface. This curved geometry is straightforward to manufacture using conventional molding techniques while dramatically reducing the friction coefficient and energy consumption
4Reliability
If a sealing ring with optimized radius of curvature and concave surfaces is used, then friction force is reduced and durability is improved, but the structural complexity increases
Solution Approach 1:
The concave surfaces are introduced only at specific locations (axial sides and/or back surface) rather than redesigning the entire sealing ring structure. This localized modification approach improves durability through reduced tension forces and better stress distribution while minimizing the increase in overall structural complexity
Solution Approach 2:
The invention defines specific parameter ranges (radius of curvature R and concave surface depth) that can be directly implemented in conventional manufacturing processes. By optimizing these parameters within defined ranges rather than requiring complex geometric features, the design achieves improved durability with minimal structural complexity
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 effectively lowers friction force and tension force, improving durability and reducing energy consumption by optimizing the radius of curvature and concave surface design, while preventing buckling and maintaining effective sealing.
Implementation Method 1
a sliding portion with the other member being formed in a circular arc cross sectional shape... Friction Characteristic (Stribeck curve) of a D-ring... A lubricating oil 5 is filled in one side of the D-ring 21
Data Source
AI summary
A sealing ring used for reciprocating motion and having low friction characteristics. The sealing ring is held at one of two members that move relative to each other and slidably in intimate contact with the other. The sealing ring has an end sliding part having an arcuate cross section and slidably in intimate contact with the other and also has a recessed surface formed in at least either a rear face or both side faces in an axial direction. The sealing ring satisfies the relationships of A/2<R<13A2 and 0.5A<C<A, where R is the radius of curvature of the end sliding part, A is the axial width of the sealing ring, and C is the thickness of the sealing ring between the deepest parts of the recessed surfaces.