Shaft Sealing Ring Mounting Tool for Reverse-Lip Installation
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Solution Overview
Problem
Existing shaft sealing technologies face challenges in preventing the eversion and damage of sealing lips during the mounting process, particularly when mounting shaft sealing rings in a direction opposite to their preferred curvature.
Innovation Solution
A two-part mounting tool comprising a cup-shaped bottom part and a conical top part is used to spread the sealing lip of the shaft sealing ring to its maximum expansion diameter, allowing the shaft to be inserted in a direction opposite the curvature of the sealing lip, thereby preventing eversion and ensuring reliable positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a shaft sealing ring is mounted in the direction opposite to its preferred mounting direction (counter to sealing lip curvature), then the positioning can be achieved, but the sealing lip tends to evert and become damaged
Solution Approach 1:
The mounting tool acts as an intermediary device between the shaft and the sealing ring. It includes a mounting sleeve that fits over the shaft and a mounting tool that pushes the sealing ring onto the shaft in the counter-preferred direction. The mounting tool distributes the mounting force evenly and prevents direct contact that would cause sealing lip eversion, thus enabling reverse mounting while protecting the sealing lip.
Solution Approach 2:
The mounting tool is designed with a conical expansion section that preliminarily expands the sealing ring in the radial direction before the actual mounting process. This preliminary expansion prepares the sealing ring for mounting in the counter-preferred direction by creating clearance and reducing resistance, allowing the sealing lip to be positioned correctly without eversion during the subsequent pushing action.
2Reliability
If a cup-shaped mounting sleeve is used to protect the sealing lip during mounting, then the sealing lip is protected from damage, but the mounting process becomes more complex and time-consuming
Solution Approach 1:
The invention merges the protective function of the mounting sleeve with the mounting function into a single integrated tool. The mounting tool includes both the protective mounting sleeve and the pushing mechanism in one component, eliminating the need for separate protective devices and reducing the number of steps required during mounting operations.
Solution Approach 2:
The mounting tool is segmented into functional sections: a protective mounting sleeve section that prevents sealing lip damage, a conical expansion section that prepares the sealing ring, and a pushing section that applies force. This segmentation allows each part to perform its specific function efficiently while maintaining overall tool simplicity.
3Reliability
If the sealing ring is expanded to maximum diameter during mounting, then the sealing lip can be positioned without eversion, but the mounting tool requires larger dimensions
Solution Approach 1:
The mounting tool incorporates a dynamic expansion mechanism where the conical section expands the sealing ring progressively during the mounting process. The expansion ratio and timing are optimized so that the sealing ring reaches maximum diameter only at the critical moment when the sealing lip needs positioning, while the tool itself maintains compact dimensions for storage and handling.
Data Source
AI summary
A mounting tool for positioning a shaft sealing ring on a shaft against a curvature of a sealing lip of a shaft sealing ring, wherein the shaft sealing ring has an annular main body, a sealing lip and can be applied to the shaft and a spring washer for pre-tensioning the sealing lip in the direction of the shaft, wherein the sealing lip has a curvature which is outward in the direction of an opening formed by the shaft sealing ring, comprising a bottom part and a top part, wherein the top part is removably fastened to the bottom part in that one end thereof is inserted partially into the bottom part, wherein another end of the top part, is substantially conical and an outside diameter of the bottom part corresponds to the maximum expansion diameter of the sealing lip of the shaft sealing ring.