Double-Lip Seal for Pneumatic Brake Chamber

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Solution Overview

Problem

Conventional sealants between the inner circumferential surface of the through-hole of an adaptor housing and the outer circumferential surface of an actuator rod in pneumatic spring brake chambers have weak contact forces, leading to reduced sealing performance and degradation due to impurity intrusion.

Innovation Solution

A double-lip seal with grooves is implemented, featuring first and second lip portions spread apart at 15-20 degrees, and a groove to catch impurities, ensuring a strong contact force and preventing fluid leakage by trapping impurities at the initial stage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional sealant is used between the adaptor housing and actuator rod, then the sealing function is initially adequate, but the sealing performance degrades over time due to impurity intrusion and weak contact force

Engineering Contradiction:

Improvesealing performanceVSAvoidservice life of sealant

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The sealant is divided into a double-lip structure with first and second sealing lips, creating multiple sealing zones. This segmentation allows impurities to be trapped between the lips rather than compromising the entire seal, maintaining reliability over time despite impurity intrusion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The double-lip sealant is designed with grooves and sealing surfaces that proactively trap impurities before they can reach the critical sealing interface. This preliminary action of capturing contaminants prevents the degradation that would otherwise occur with conventional single-lip sealants.

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If a single-lip sealant is used, then the structure is simple, but the contact force with the inner circumferential surface of the through-hole and actuator rod is weak

Engineering Contradiction:

Improvesealant structureVSAvoidcontact force

Core Design Contradiction:

Device complexityVSForce

Solution Approach 1:

The sealant is segmented into two distinct lips, each capable of contacting the sealing surfaces independently. This dual-lip configuration doubles the contact points and distributes the sealing force more effectively across the interface between the adaptor housing and actuator rod.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The double-lip sealant adds a dimensional aspect to the sealing interface by creating multiple contact zones along the axial direction. This multi-dimensional approach increases the total contact area and force distribution without significantly complicating the overall installation process.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If impurities are allowed to enter the sealing area, then the initial sealing may be maintained, but the sealant contact surface is pushed and sealing performance degrades

Engineering Contradiction:

Improvesealing functionVSAvoidimpurity intrusion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The groove structure in the double-lip sealant converts the harmful effect of impurities into a beneficial trapping mechanism. Impurities that would normally degrade the seal are instead captured and held in the groove, preventing them from reaching and compromising the critical sealing surfaces.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The groove acts as an intermediary zone between the external environment and the critical sealing interface. It serves as a buffer that intercepts impurities, allowing the main sealing surfaces to remain clean and effective throughout the service life of the sealant.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 double-lip seal maintains constant sealing performance by catching impurities in the grooves, preventing further leakage and enhancing the sealing effect between the actuator rod and adaptor housing.

Implementation Method 1

a lip seal that sealingly contacts an outer circumferential surface of the adaptor housing and an inner circumferential surface of the through-hole to prevent fluid leakage

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

the lip seal has a groove to receive an impurity therein on at least one surface of the inner circumferential surface and the outer circumferential surface of the lip seal

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentUS10286889B2Double-lip seal of pneumatic spring brake chamber for vehicle

Publication Date: 2019.05.14 MIRAEVC

AI summary

The present disclosure relates to a double-lip seal of a pneumatic spring brake chamber for a vehicle, the double-lip seal has sealing performance between an inner circumferential surface of a through-hole of an adaptor housing and an outer circumferential surface of an actuator rod to prevent degradation in sealing performance of the lip seal, thereby maintaining constant sealing performance and preventing fluid leakage.