Composite Seal Ring Structure to Prevent Shaft Slip
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Solution Overview
Problem
Sealing devices that seal annular gaps between moving shafts and housings face issues with sealing performance degradation due to deformation and sliding wear under high-temperature conditions and require additional components to prevent slipping, especially when the shaft and housing reciprocate or rotate relative to each other.
Innovation Solution
A sealing device comprising a resin seal ring with a rubber-like elastic seal ring and metal spring members, where the elastic seal ring is mounted in an annular groove on the outer circumference of the resin seal ring, preventing the resin seal ring from moving with the shaft, and the spring members maintain sealing performance by radially pressing the lips, allowing the device to remain fixed to the housing during movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the sealing device is made of resin material with high rigidity, then the sealing device can maintain structural stability, but the sealing device may move together with the shaft under high-temperature conditions due to thermal expansion
Solution Approach 1:
The sealing device combines resin material (for rigidity and structural stability) with rubber-like elastic body (for thermal expansion compensation and sealing). This composite structure allows the resin portion to maintain structural integrity while the elastic body absorbs dimensional changes due to temperature variations, preventing the sealing device from moving with the shaft and maintaining reliable sealing performance.
2Reliability
If the sealing device is fixed to the housing using an annular groove and annular member, then the sealing device can be secured during relative movement, but the number of components increases
Solution Approach 1:
The sealing device integrates the sealing function and the fixing function into a single component structure. The resin seal ring and elastic seal ring are combined in a nested configuration where the elastic seal ring is mounted within the resin seal ring. This merged structure eliminates the need for separate annular members and complex groove configurations, reducing the number of components while maintaining reliable fixing to the housing during relative movement.
3Force
If the inner circumference lips are reduced in diameter under high-temperature conditions, then the tightening force increases, but the sealing device may move together with the shaft
Solution Approach 1:
The sealing device utilizes thermal expansion parameter changes beneficially. The rubber-like elastic body portion is designed to expand radially under high-temperature conditions, which increases the tightening force of the inner circumference lips against the shaft. This controlled expansion is limited by the housing bore, preventing the entire sealing device from moving with the shaft while maintaining enhanced sealing force where needed.
4Adaptability or versatility
If the outer circumference lips slide on the inner circumference surface of the shaft hole, then the sealing device can accommodate relative movement, but sliding wear occurs in the outer circumference lips
Solution Approach 1:
The sealing device segments the functional responsibilities between different materials. The resin seal ring provides structural support and positioning, while the rubber-like elastic seal ring provides the sealing function and accommodates relative movement through its elastic properties. This segmentation allows the elastic portion to handle movement accommodation without excessive sliding wear, as it can deform and recover, reducing friction and wear on the outer circumference lips.
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 prevents the sealing device from moving with the shaft, maintains sealing performance under various relative movements, and reduces the number of components needed by eliminating the need for additional grooves, thus enhancing durability and reliability.
Implementation Method 1
an elastic seal ring (300) made of a rubber-like elastic body, which is in close contact with the inner circumference surface of the shaft hole of the housing (600), mounted in the annular mounting groove (111)
Implementation Method 2
the elastic seal ring (300) made of a rubber-like elastic body which is in close contact with the inner circumference surface of the shaft hole of the housing (600)
Implementation Method 3
metal spring members, where the elastic seal ring is mounted in an annular groove on the outer circumference of the resin seal ring, preventing the resin seal ring from moving with the shaft, and the spring members maintain sealing performance by radially pressing the lips
Data Source
Figure 1
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AI summary
A sealing device capable of preventing, when a shaft and a housing move relative to each other, the sealing device from moving together with the shaft. A resin seal ring 100 includes a cylindrical section 110, a pair of inner circumference lips 120 respectively provided on both sides of the cylindrical section 110 in the axial direction, a pair of outer circumference lips 130 respectively provided on both sides of the cylindrical section 110 in the axial direction, and an annular mounting groove 111 which is provided on an outer circumference surface of the cylindrical section 110 and in which the elastic seal ring 300 is mounted. The pair of inner circumference lips 120 is reduced in diameter with distance from the cylindrical section 110 both on an inner circumference surface side and on an outer circumference surface side toward lip distal ends 121, which are configured to slide on an outer circumference surface of the shaft. The pair of outer circumference lips 130 is increased in diameter with distance from the cylindrical section 110 both on an inner circumference surface side and on an outer circumference surface side toward lip distal ends 131, which are configured to be in close contact with the inner circumference surface of the shaft hole.