Radial Shaft Seal Installation Aid with Protective Flange
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Solution Overview
Problem
Radial shaft seals are prone to damage during installation due to contact with splines or sharp-edged surfaces on the shaft, which reduces their efficacy in sealing.
Innovation Solution
A shaft-sealing device comprising a cylindrical member with a radially extending annular flange and a sealing ring, where the cylindrical member is press-fit to the shaft and the annular flange engages the sealing ring, providing protection and allowing lubricant passage, and remains attached to the shaft during operation to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the seal is mounted directly on the shaft without protection, then the installation process is simple, but the seal may become damaged by contact with splines or sharp-edged surfaces
Solution Approach 1:
The patent introduces a protective member as an intermediary component between the seal and the shaft. This protective member includes a cylindrical body with a smooth inner surface that contacts the seal during installation, preventing direct contact between the seal and harmful features on the shaft such as splines or sharp edges. The protective member is temporarily attached to the shaft, the seal is installed over it, and then the protective member is removed, leaving the seal properly positioned without damage.
2Reliability
If a protective device is used during seal installation, then the seal is protected from damage, but the device must be manually removed after mounting
Solution Approach 1:
The protective member is designed to be temporarily attached to the shaft during seal installation and then easily removed afterward. The protective member includes a cylindrical body that can be slipped onto the shaft, used to guide the seal into place, and then extracted. This extraction principle allows the protective function to be provided without permanently adding complexity to the final assembly, as the protective member is discarded or reused after serving its purpose.
3Reliability
If the seal is protected during installation, then damage is prevented, but additional components and steps are required
Solution Approach 1:
The protective member is prepared and attached to the shaft before the seal installation process begins. This preliminary action ensures that the protective barrier is already in place when the seal is being installed, preventing damage from the outset. The protective member is designed to be quickly attached and even more quickly removed after the seal is in place, minimizing the additional time required while ensuring comprehensive protection throughout the critical installation phase.
Data Source
AI summary
A shaft-sealing device comprising a sealing ring having a seal secured thereto, and a protective member engaged with the sealing ring. The said protective member includes a cylindrical member having a shaft-engaging surface and a seal-engaging surface, and an annular flange extends radially away from the shaft. The shaft-engaging surface is operable to be attached to the shaft during operation of the device, and the seal-engaging surface is operable to be in sealing contact with the seal during operation of the device. The annular flange is operable to engage the sealing ring.