Lip Type Seal Retaining Protrusions Prevent Radial Detachment
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Solution Overview
Problem
Conventional lip type seals face challenges in recyclability, assembly retention, installation workability, resistance to foaming, and maintaining circularity and coaxiality under high load conditions, leading to reduced sealing performance.
Innovation Solution
A lip type seal design featuring a cartridge, a first lip seal member made of rubber-like elastic material, a case, a second lip seal member made of resin, a backup ring, and an adapter, where the components are assembled in a non-bonding manner with caulking and fitting to enhance assembly retention and prevent foaming, while protrusions and projections prevent relative movement and ensure proper positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the first seal lip is bonded through vulcanization to a metal reinforcing ring to achieve strong bonding, then the bonding strength is improved, but the recyclability deteriorates because the components cannot be easily separated and sorted
Solution Approach 1:
The seal is divided into separate components: a first lip seal member made of rubber-like elastic material and a second lip seal member made of resin, which are assembled in a non-bonding manner. This segmentation allows each component to be easily separated and sorted for recycling while maintaining functional integrity during use.
Solution Approach 2:
A retaining structure acts as an intermediary between the first and second lip seal members, providing mechanical retention without chemical bonding. This intermediary mechanism enables both strong assembly retention and easy disassembly for recycling purposes.
2Ease of manufacture
If the lip seal components are assembled in a non-bonding manner to improve recyclability, then the ease of separation is improved, but the assembly retaining property deteriorates because the components may separate under axial force
Solution Approach 1:
The retaining structure is designed in advance to prevent axial separation of components. By incorporating this retention mechanism before assembly, the seal maintains strong assembly retaining property without requiring bonding, while still allowing easy separation when needed.
3Reliability
If compression load is applied during installation to ensure sealing contact, then the sealing performance is improved, but the installation workability deteriorates due to the complexity of applying compression load
Solution Approach 1:
The first lip seal member is designed with elastic properties that allow it to dynamically adapt to the shaft and housing surfaces. This elasticity enables the seal to achieve proper contact and sealing performance without requiring complex compression load application during installation.
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 easy separation and sorting of components, improves assembly retention, prevents foaming, and stabilizes sealing performance by maintaining the circularity and coaxiality of the seal lip, thus enhancing the overall sealing effectiveness.
Implementation Method 1
a first lip seal member (21) which is fitted to the cartridge (11) in a non-bonding manner and is made of a rubber-like elastic material
Implementation Method 2
a second lip seal member (41) which is made of a resin and a backup ring (51) which supports the second lip seal member, the second lip seal member (41) and the backup ring (51) being retained in a caulking manner to the case (31)
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Provided is a lip type seal wherein a resin-made second lip seal member, which is a component of the lip type seal, can be effectively prevented from detaching radially inward from between a case and a backup ring by being dragged by a shaft when this shaft is being inserted. To achieve this, the lip type seal comprises a cartridge to be fit into the inner circumference of a shaft hole, a first lip seal member, a case, the resin-made second lip seal member, the backup ring, and an adapter. A protrusion section is provided in a partial portion of the circumference of a first flange section of the case. This protrusion section engages with the second lip seal member, thereby preventing the second lip seal member from turning with respect to the case and from detaching radially inward. Also, at the same time, a projecting section is provided in a partial portion of the circumference of the flange section of the backup ring. This projecting section engages with the second lip seal member, thereby preventing the second lip seal member from turning with respect to the backup ring and from detaching radially inward.