Seal Coating Layer for Labyrinth Gap and Low Rotational Torque
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Solution Overview
Problem
Existing sealing devices face challenges in achieving both high sealing performance and torque reduction without considering dimensional tolerances of the constituent members.
Innovation Solution
A sealing device with a first and second seal member, featuring a coating layer with an easily scraped property, forms a labyrinth-like gap through relative rotation, utilizing a solid lubricant or liquid adhesive with a low coefficient of friction to enhance sealing and reduce torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a labyrinth with a small gap is designed to improve sealing performance and reduce torque, then sealing performance and torque reduction are improved, but the design is limited by dimensional tolerances of members and parts
Solution Approach 1:
A coating layer is applied to one of the facing surfaces in the gap between the first and second seal members. This coating layer acts as an intermediary that can be easily scraped or worn away during initial operation, automatically forming the desired small gap (labyrinth) without requiring precise manufacturing tolerances. The coating material serves as a sacrificial element that transforms the manufacturing problem into a self-adjusting process.
Solution Approach 2:
The coating layer is applied in advance to the surface before assembly. During initial rotation or operation, the coating is scraped or worn away to form the labyrinth gap. This preliminary action allows the gap to be created automatically during the first few operations, eliminating the need for precise pre-manufacturing of the gap dimension.
2Reliability
If a seal lip is arranged in a region into which muddy water intrudes to improve sealing, then sealing performance is improved, but rotational torque increases due to sliding contact
Solution Approach 1:
The coating layer serves as a mediator between the seal members in the gap region. It provides a low-friction surface that reduces sliding contact and rotational torque while still maintaining the sealing function. The coating material (such as PTFE or other lubricious materials) acts as an intermediary that allows relative motion with minimal friction.
Solution Approach 2:
The invention replaces the traditional mechanical seal lip contact with a coating-based solution. Instead of relying on direct rubber-to-metal sliding contact, the coating layer provides the sealing and friction-reduction function, substituting a simple coating application for a complex seal lip design.
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 device achieves both effective sealing and torque reduction by forming minute gaps that act as labyrinths, independent of dimensional tolerances, while minimizing friction and preventing intrusion of contaminants.
Implementation Method 1
a coating layer having an easily scraped property... which slidably contacts a region to which the coating layer faces in a state in which the first seal member and the second seal member rotate relative to each other
Implementation Method 2
utilizing a solid lubricant or liquid adhesive with a low coefficient of friction to enhance sealing and reduce torque
Data Source
AI summary
A sealing device to seal an annular space formed by a fixed side member and a rotation side member, including a first seal member and a second seal member, and being provided between the two members in a state in which the first and the second seal members are combined. The sealing device includes a coating layer having an easily scraped property and being provided at least at one place in a gap between facing regions in which the first and the second seal members are provided so as to face each other in an initial state in which the first and the second seal members are combined. The coating layer slidably contacts a region to which the coating layer faces in a state in which the first and the second seal members rotate relative to each other from the initial state.