Radial Shaft Sealing Ring with Conical Lip Angles
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Solution Overview
Problem
Sealing rings with small diameters face issues with deformation and wear during start-stop operations, leading to leaks and compromised sealing performance due to insufficient lubrication and shaft eccentricity, especially in applications with pressure differences.
Innovation Solution
A radial shaft sealing ring design featuring a sealing lip with annular surfaces of a cone frustum, where the first surface is oriented towards the external space and the second towards the internal space, forming specific angles in the installed position to minimize contact surface width and maximize robustness, along with an additional sealing lip and a ring-shaped bearing supporting body to prevent deformation and enhance sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If sealing rings with small diameters are used, then the sealing performance is improved for compact applications, but deformation and wear occur during start-stop operations leading to leaks
Solution Approach 1:
The patent modifies the geometric parameters of the sealing lip by defining specific angle ranges (α: 35-65°, β: 15-30°) for the conical surfaces. These parameter changes optimize the contact surface area and pressure distribution, allowing small-diameter sealing rings to maintain reliable sealing even during start-stop operations with shaft eccentricity.
Solution Approach 2:
The sealing lip features non-uniform conical surfaces with different angles (α and β) on opposite sides. This local quality variation creates asymmetric contact characteristics that compensate for shaft eccentricity and improve sealing reliability in small-diameter applications where uniform geometry would fail.
2Duration of action of moving object
If the sealing lip contact surface is widened to reduce wear, then durability is improved, but the axial width increases compromising compactness
Solution Approach 1:
By optimizing the conical surface angles (α: 35-65°, β: 15-30°), the patent achieves an optimal balance where the contact surface area is sufficient to reduce wear, yet the axial projection remains compact. The mathematical relationship between these angles and the contact dimensions allows simultaneous optimization of both durability and compactness.
3Reliability
If the sealing lip is pressed harder on the shaft to prevent leaks, then sealing effectiveness is improved, but deformation and wear increase
Solution Approach 1:
The asymmetric conical surfaces create localized high-pressure zones that adapt to shaft eccentricity. The pressure is concentrated on the leading edge (larger angle α) while the trailing edge (smaller angle β) provides structural support, distributing the mechanical load to prevent deformation while maintaining sealing effectiveness.
Solution Approach 2:
The conical surfaces provide curved contact geometry that distributes pressure more evenly compared to flat surfaces. This curvature allows the sealing lip to conform to shaft deviations and eccentricity, maintaining effective sealing pressure without requiring excessive overall force that would cause deformation.
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 ensures a robust and durable sealing performance with reduced wear and sensitivity to shaft eccentricity and pressure differences, maintaining effective sealing even with small diameters, and includes a lubricant reservoir to further enhance sealing efficiency.
Implementation Method 1
The sealing lip is pressed by means of an annular helical spring on the shaft
Implementation Method 2
the periphery of the sealing lip at the time of the installation of the shaft is elastically broadened
Data Source
AI summary
A radial shaft sealing ring for the sealing separation of an internal space (6), from an external space (5), with a sealing lip (2) delimited by a first and a second annular surface (3, 4) of a cone frustum, wherein, the first annular surface (3) is oriented towards the external space (5), and the second annular surface (4) is oriented towards the internal space (6), wherein the annular surfaces (3, 4) are connected to each other via a ring-shaped contact surface (23) of the sealing lip (2), which rests on the shaft (7), wherein the first annular surface (3) forms with the shaft (7) a first angle (β′) of 23-40° in the installed position, wherein an inner diameter (24) of the ring-shaped contact surface (23) is 1-15 mm in the installed position.