Plastic Slinger Bumper Labyrinth for Mud Slurry Sealing

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Solution Overview

Problem

Existing sealing arrangements between a shaft and a housing fail to effectively prevent water and debris from entering the lubricated area, especially under dynamic conditions such as high rotational speeds, where liquids or mud slurry can penetrate and cause contamination.

Innovation Solution

A plastic slinger with a radially extending wall portion and an axially protruding labyrinth feature, along with raised bumper features, is designed to exclude liquids and mud slurry by utilizing centrifugal force and providing a drainage pathway, while being easily mountable with a snap-fit design to ensure a zero or minimal gap for effective contaminant exclusion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a traditional sealing arrangement with a slinger is used, then the seal can shield the elastomeric seal from water and debris, but liquids or mud slurry can still penetrate under dynamic conditions such as high rotational speeds

Engineering Contradiction:

Improvesealing effectivenessVSAvoidliquid and debris penetration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The slinger is divided into two semi-circular parts that can be assembled together, allowing for a snap-fit installation that ensures proper positioning and minimizes gaps where contaminants could penetrate, thereby improving sealing reliability under dynamic conditions

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The labyrinth feature acts as an intermediary barrier between the external environment and the sealed cavity, creating a complex path that prevents direct penetration of liquids and debris while allowing the seal to function effectively

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If a snap-fit design is used for the slinger, then installation complexity is reduced, but the structural complexity of the slinger increases with multiple parts

Engineering Contradiction:

Improveinstallation easeVSAvoidslinger structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The slinger is segmented into two semi-circular parts that can be independently manufactured and then easily assembled through a snap-fit mechanism, simplifying installation while the modular design allows for easier manufacturing and quality control

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The two semi-circular parts are combined through a snap-fit connection that integrates them into a functional unit, achieving both ease of assembly and structural integrity without requiring complex fastening mechanisms

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If the slinger is made as a single piece, then manufacturing is simpler, but mounting and alignment precision becomes more difficult

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidmounting precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

Dividing the slinger into two semi-circular parts allows each part to be manufactured independently with standard tolerances, and the snap-fit design ensures proper alignment during assembly, achieving both manufacturing simplicity and mounting precision

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The two semi-circular parts are pre-formed with complementary features that ensure proper alignment during snap-fit assembly, eliminating the need for complex alignment procedures during installation

Inventive Principle:

Principle #10Preliminary action

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 liquids and contaminants from entering the internal cavity, maintaining a clean environment within the sealing arrangement and reducing installation complexities, with the labyrinth feature ensuring additional protection against slow-rotation leakage.

Implementation Method 1

designed to exclude liquids and mud slurry by utilizing centrifugal force

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Implementation Method 2

an axially protruding labyrinth feature extending from the radially extending wall portion and toward the seal member

Methodology Applied

Scientific EffectLabyrinth flow path:

Data Source

PatentUS11255382B2Plastic slinger with contacting bumper feature with labyrinth

Publication Date: 2022.02.22 FREUDENBERG NOK GEN PARTNERSHIP

AI summary

A seal assembly includes a housing defining a bore and a shaft received in the bore. A seal member is secured to the housing for sealing a gap between the housing and the shaft. A slinger is secured to the shaft. The slinger being made from plastic and including a first semi-circular part and a second semi-circular part that is secured to the first semi-circular part. The slinger includes a radially extending wall portion with a raised bumper feature at a radially outer surface opposing the seal member. The slinger further includes an axially protruding labyrinth feature extending from the radially extending wall portion and toward the seal member. The first semi-circular part and the second semi-circular part can be snap fit to one another.