Sealing Device with Annular Projections for Shaft Seals
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Solution Overview
Problem
Conventional sealing devices in farm and construction machinery fail to maintain effective sealing over time due to radial and thrust direction displacement, leading to disengagement and reduced sealing performance in severe external environments like muddy water exposure.
Innovation Solution
A sealing device with a sleeve member featuring an inner cylinder, collar portion, and a discoid protection ring, where the collar portion includes multiple annular projections made of rubber-like elastic material to maintain contact and prevent displacement, ensuring continuous sealing efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single annular projection is used to contact the tubular folded portion, then the structure is simple, but the sealing performance deteriorates under radial and thrust displacement
Solution Approach 1:
The single annular projection is divided into multiple annular projections (first, second, and third annular projections) arranged at different positions. This segmentation allows the collar portion to maintain contact with the tubular folded portion even when displacement occurs in radial or thrust directions, as at least one projection remains engaged, thereby maintaining sealing performance while managing structural complexity.
2Adaptability or versatility
If the collar portion and tubular folded portion are allowed to displace freely, then the device adapts to displacement, but the contact disengages and sealing performance deteriorates
Solution Approach 1:
The collar portion is designed with multiple annular projections that can dynamically adapt to displacement in radial and thrust directions. The projections are positioned such that when displacement occurs, at least one projection remains in contact with the tubular folded portion, allowing the structure to accommodate movement while maintaining the sealing function throughout the displacement range.
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 annular projections act as a bumper to maintain the positional relationship between seal components, preventing leakage and external intrusion of muddy water or dust, even under displacement, thus enhancing long-term sealing performance in harsh environments.
Implementation Method 1
a radial lip portion which is integrally formed in the inner collar-like portion, is made of a rubber-like elastic material and comes into contact in a sealing manner with an outer peripheral surface of the inner cylinder portion
Implementation Method 2
an end face lip portion which comes into elastic contact with the collar portion
Implementation Method 3
a first dust lip which comes into elastic contact with an inner peripheral surface of the tubular folded portion and is made of a rubber-like elastic material
Implementation Method 4
a second dust lip which comes into elastic contact with an inner side surface 53 of the protection ring 5 and is made of a rubber-like elastic material
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The objective of the present invention is to provide a sealing device that is capable of effectively preventing the infiltration of muddy water or dust from the outside, even when used for a long time in a limited space in a shaft seal part of agricultural machinery, industrial machinery, or the like, which are exposed to a severe external (atmosphere-side) environment such as muddy water. Therefore, provided is a sealing device comprising: a sealing member for sealing a gap between a housing and a rotary shaft which extends through the housing; a sleeve member; and a protective ring. A flange part of the sleeve member is constructed so as to form a first dust lip, which is formed with a rubber elastic material and makes elastic contact with the inner circumferential surface of a tubular bent part, a second dust lip, which is formed with a rubber elastic material and makes elastic contact with the inner side surface of the protective ring, and multiple ring-shaped protrusions, which are formed with a rubber elastic material and are provided on the opposing surface of the flange part so as to be capable of making contact with the tip of the tubular bent part.