Double Cylinder Sealing Device for Muddy Water Discharge
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Solution Overview
Problem
The existing sealing devices, with a slinger formed in a reclined U shape, face challenges in discharging intruded muddy water and dust, leading to seal function deterioration and reduced lifespan due to jamming and abrasion at the elastic contact portion.
Innovation Solution
A sealing device with a first member in a double cylindrical shape, featuring a first labyrinth portion of at least 1.5 mm in axial length and an inner diametrical side region of at least 0.75 mm, combined with a second labyrinth portion of less than 1 mm, effectively prevents muddy water intrusion and enhances discharge through centrifugal and pumping actions, reducing wear and extending device life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the slinger is formed in a reclined U shape with a single cylindrical portion, then the structure is simple and easy to manufacture, but muddy water intruding into the sealing device accumulates in the enclosed space and cannot be discharged, leading to seal function deterioration
Solution Approach 1:
The slinger is divided into two separate cylindrical portions: a first cylindrical portion fitted to the inner member and a second cylindrical portion extending from the circular plate portion. This segmentation creates a through-path for muddy water discharge while maintaining structural simplicity, resolving the contradiction between ease of manufacture and seal function durability.
Solution Approach 2:
The second cylindrical portion extends in the axial direction from the circular plate portion, creating a three-dimensional discharge path that allows muddy water to be expelled from the sealing device. This dimensional addition enables effective discharge without complicating the overall structure, addressing both manufacturing ease and reliability.
2Object-affected harmful factors
If the labyrinth portion length is kept adequate to prevent muddy water intrusion, then sealing effectiveness is improved, but the space for muddy water discharge is reduced when using a reclined U shape configuration
Solution Approach 1:
The labyrinth portion is segmented into two parts: a first labyrinth portion between the first cylindrical portion and the second member, and a second labyrinth portion between the second cylindrical portion and the second member. This segmentation allows adequate labyrinth length for intrusion prevention while creating separate discharge pathways, resolving the contradiction between sealing effectiveness and discharge space.
Solution Approach 2:
The second cylindrical portion extends axially to create a discharge path in the axial dimension, allowing muddy water to be expelled without requiring additional radial or circumferential space. This maintains adequate labyrinth portion length for intrusion prevention while providing sufficient discharge volume.
3Reliability
If foreign objects are jammed into the elastic contact portion of the side lip, then sealing contact is maintained, but abrasion occurs during rotation leading to wear and further intrusion
Solution Approach 1:
The invention extracts the harmful effect by providing a discharge path that removes muddy water and foreign objects from the sealing device before they can cause abrasion. The second cylindrical portion enables foreign objects to be discharged with the muddy water, preventing jamming into the elastic contact portion and extending service life while maintaining sealing contact.
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 muddy water intrusion, enhances discharge efficiency, and prolongs the sealing device's lifespan by elongating the intrusion route and utilizing centrifugal action to rapidly expel water, minimizing dust jamming and abrasion.
Implementation Method 1
a seal lip portion made of elastic material that is fixed to the core member and elastically contacts the first member
Implementation Method 2
enhances discharge ability of intruding muddy water... by a centrifugal action and a pumping action of the first member
Implementation Method 3
by a centrifugal action and a pumping action of the first member in accordance with axial rotation of the inner member
Data Source
AI summary
A sealing device provided between an outer member and an inner member that coaxially rotates relative to the outer member. The sealing device includes a first member in a form of a double cylinder being fitted onto the inner member; and a second member including a core member that is fitted into the outer member and a seal lip portion made of elastic material that is fixed to the core member and elastically contacts the first member, the first member and the second member being combined. The first member includes an inner diametrical side cylindrical portion and an outer diametrical side cylindrical portion that extend toward the second member in an axial direction. The outer diametrical side cylindrical portion of the first member has a first labyrinth portion and a second labyrinth portion between the outer diametrical side cylindrical portion and the second member, the first labyrinth portion being provided in the axial direction, the second labyrinth portion being provided in a radial direction and connected to the first labyrinth portion, the first labyrinth portion being equal to or more than 1.5 mm in length along a shaft.