Radial Shaft Seal Ring With Sinusoidal Ribs for Bidirectional Sealing
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Solution Overview
Problem
Existing radial shaft seal rings face challenges in achieving dynamic sealing in both directions of shaft rotation, with issues related to frictional torque, robustness against foreign particles, negative pressure capability, and wading capability.
Innovation Solution
A radial shaft seal ring design incorporating a ring coil spring on the opposite side of the sealing lip to exert a radially inward force, combined with a bidirectional sinusoidal swirl rib structure, enhancing contact force and contact area with the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ring coil spring is added to exert radially inward force on the sealing lip, then the contact force and robustness against foreign particles are improved, but the frictional torque increases
Solution Approach 1:
The patent modifies the physical parameters of the sealing system by introducing a ring coil spring that applies radial force, changing the contact pressure parameters to improve robustness while managing friction through the specific spring design and positioning
Solution Approach 2:
The ring coil spring provides dynamic adaptability, allowing the sealing lip to maintain optimal contact force with the shaft under varying operating conditions, including bidirectional rotation, thereby improving reliability without excessive frictional torque
2Reliability
If sinusoidal swirl ribs are used to achieve dynamic sealing in both directions of rotation, then the sealing function is improved, but the device complexity increases
Solution Approach 1:
The patent employs sinusoidal (curved) swirl ribs instead of straight ribs, creating a wave-like structure that enables bidirectional dynamic sealing. The curved geometry generates hydrodynamic effects in both rotation directions, improving sealing reliability while the periodic pattern manages structural complexity
Solution Approach 2:
The sinusoidal swirl ribs serve multiple functions simultaneously: they provide sealing contact, generate hydrodynamic pressure for bidirectional sealing, and guide lubricant flow, thereby achieving complex sealing requirements with a single structural element
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 achieves improved sealing performance with reduced frictional torque, increased robustness against foreign particles, and enhanced negative pressure resistance, suitable for sealing modern oils in e-transmissions.
Implementation Method 1
a ring coil spring which is arranged on the side of the sealing lip opposite the contact area in order to exert a radially inwardly directed force on the sealing lip
Implementation Method 2
By means of the sinusoidal swirl ribs, dynamic sealing is achieved in both directions of rotation of the shaft
Data Source
AI summary
A radial shaft seal ring having a supporting body and connected to the supporting body a sealing element with a flexible sealing lip, which comprises a contact area for sealingly contacting a shaft, wherein in the contact area of the sealing lip a sealing edge, a plurality of circumferentially sinusoidal closed-loop, arranged in phase with one another and sinusoidal back-feeding channels formed between the swirl ribs are provided in the contact area of the sealing lip, wherein the radial shaft seal ring comprises a ring coil spring which is arranged on the side of the sealing lip opposite the contact area in order to exert a force directed radially inwards on the sealing lip.