Sealing Device Side Lip Interference Prevention
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Solution Overview
Problem
Conventional sealing devices used as hub bearing seals face interference issues between side lips during stacking, leading to adhesion and lubricant loss, due to limited axial length in the attaching space, which complicates piling and installation.
Innovation Solution
The proposed sealing device incorporates a rubber step part and a cylinder portion with a tubular structure, allowing the cylinder portion to mount on the rubber step part, preventing side lip interference, and featuring inward and outward flange portions to stabilize the piling attitude and enhance sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length in axial direction of outer peripheral tubular portion is increased to prevent interference between side lips during piling, then side lip interference is reduced, but the attaching space in bearing outer ring is exceeded
Solution Approach 1:
The patent introduces a radial dimension solution by providing a cylinder portion that extends radially inward from the outer peripheral tubular portion. This radial extension allows the upper sealing device to be mounted on the rubber step part of the lower sealing device, effectively using the radial space to prevent axial interference between side lips during piling, without increasing the axial length of the mounting ring.
2Productivity
If multiple sealing devices are piled coaxially for shipping, then storage and transport efficiency is improved, but side lip interference and adhesion occur
Solution Approach 1:
The patent introduces the cylinder portion and rubber step part as intermediary structures between adjacent sealing devices. The cylinder portion of the upper device mounts on the rubber step part of the lower device, creating a stable intermediate connection that prevents direct contact and interference between side lips during piling, thus maintaining lubricant integrity while enabling efficient storage and transport.
3Volume of moving object
If the attaching space in bearing outer ring is fully utilized, then space efficiency is improved, but there is insufficient space to prevent interference between side lips
Solution Approach 1:
The patent implements a nested configuration where the cylinder portion of the upper sealing device is mounted on the rubber step part of the lower sealing device. This nesting arrangement allows multiple sealing devices to be compactly stacked within the limited attaching space of the bearing outer ring, maximizing space utilization while the hierarchical structure prevents side lip interference through the intermediate rubber step part.
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
This configuration effectively prevents side lip interference, stabilizes the piling attitude, and improves sealing performance by accommodating side lips in a narrow space, ensuring effective sealing against foreign materials like muddy water and dust.
Implementation Method 1
a rubber-like elastic body 11 which is attached to the mounting ring 2
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A sealing device having a side lip, in which, when a multiple of such sealing devices are stacked one on top of the other, interference between the side lips is effectively suppressed. The sealing device is installed on one of two members rotating relative to each other and slidably in intimate contact with the other member. The sealing device is constructed by combining a mounting ring fitted on the one member and a rubber-like elastic body coated on the mounting ring and has the side lip formed from the rubber-like elastic body and slidably in intimate contact with the other member. The mounting ring has a circular hollow cylindrical part at a portion fitted on the peripheral surface of the one member. The rubber-like elastic body has a rubber step part provided on axially one side of the circular hollow cylindrical part. When a multiple of sealing devices of the invention are stacked one on top of the other, the rubber step part of one sealing device and the circular hollow cylindrical part of a corresponding upper sealing device have a positional relationship in which the rubber step part allows the circular hollow cylindrical part to be placed on it, and the side lip of the one sealing device is dimensioned so as not to interfere with the upper sealing device even when they are in such a positional relationship.