Coaxial Staking Tool for Bore Insert Sealing Without Distortion

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Solution Overview

Problem

Conventional methods for installing fluid system components within bores, such as swaging or staking, often require significant force, leading to imperfect seals and distortion of critical dimensions, which can degrade the performance of the components.

Innovation Solution

A method and tool using a co-axial staking tool with an inner and outer member, where the inner member is concentric and smaller in diameter, and a resilient biasing member within a blind cavity, applying distinct load characteristics to securely stake and seal the component without distorting the bore material.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If significant force is applied to distort the bore material for component retention, then secure retention is achieved, but sealing quality deteriorates and component dimensions are distorted

Engineering Contradiction:

Improvecomponent retentionVSAvoidseal quality and component dimensions

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The installation tool is divided into two separate concentric members: an outer member that applies force to distort the bore material for retention, and an inner member that applies force to the component for sealing. This segmentation allows each member to perform its specific function independently without interfering with the other, thus achieving both secure retention and adequate sealing while preventing distortion of critical component dimensions.

Inventive Principle:

Principle #1Segmentation

2Strength

If excessive force is transmitted to the seal, then component retention is improved, but seal quality deteriorates

Engineering Contradiction:

Improvecomponent retentionVSAvoidseal integrity

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

By separating the retention function (outer member distorting bore material) from the sealing function (inner member compressing seal), the tool prevents excessive force transmission to the seal while ensuring adequate retention. The inner member is specifically designed to apply controlled sealing force without the excessive forces needed for retention.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The inner member acts as an intermediary between the installation tool and the component seal, providing controlled force transmission specifically for sealing purposes. This intermediary protects the seal from excessive forces that would be necessary if a single tool member attempted to perform both retention and sealing functions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If a single tool member is used to install the component, then device complexity is reduced, but the ability to apply distinct load characteristics deteriorates

Engineering Contradiction:

Improvetool structureVSAvoidload characteristic control

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The tool uses two concentric members that can be independently designed with different geometries, materials, and force characteristics. The outer member is optimized for distorting bore material while the inner member is optimized for sealing the component. This segmentation enables each member to apply its specific load characteristic effectively.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The concentric members are designed to deform in a controlled sequence during installation: the outer member first distorts the bore material, then the inner member applies sealing force. This dynamic, staged approach allows distinct load characteristics to be applied at different stages of the installation process.

Inventive Principle:

Principle #15Dynamics

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 approach ensures secure retention and adequate sealing of fluid system components within bores without distorting the components, maintaining their performance and preventing radial strain in thin-walled materials.

Implementation Method 1

a resilient biasing member is disposed within the blind cavity, the resilient biasing member being configured to provide an axial load on the inner tool member

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

deformation of the bore material has occurred over a portion of the insert resulting in securely staking of the insert in the bore

Methodology Applied

Scientific EffectPlastic deformation: Plasticity

Data Source

PatentUS11253909B2Method of and device for installing a component in a bore

Publication Date: 2022.02.22 THE LEE CO

AI summary

An installation tool for installing an insert into a bore having a bore material, the insert having a fluid component disposed within a housing, the installation tool including: an outer tool member and an inner tool member, the inner tool member being concentric with, smaller in diameter than, and slidingly engaged within the outer tool member, the inner tool member being configured to axially drive the insert into the bore; wherein an upper end of the outer tool member forms and defines a blind cavity between the inner tool member at one end of the blind cavity and a cavity end wall at an opposing end of the blind cavity; wherein a resilient biasing member is disposed within the blind cavity, the resilient biasing member being configured to provide an axial load on the inner tool member.