Positive-Locking Bushing Joint to Prevent Rotation and Migration

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing methods for attaching bushings to components fail to reliably prevent relative movement due to swelling or changing loads, leading to increased wear and corrosion, and often require specialized tools or result in insufficient joining force.

Innovation Solution

A method involving the formation of form-fitting means through a caulking or rolling process, where a socket with a head section and positive locking means is deformed to create a secure connection with the component, reducing relative movement and enhancing joining force.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If thermal insertion method is used to join bushing to component, then joining force is increased compared to no joining, but the joining force is insufficient to reliably prevent rotation or migration under prolonged fluctuating or alternating loads

Engineering Contradiction:

Improvejoining forceVSAvoidprevention of rotation or migration

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The bushing is segmented into a head section and a bushing body, with the head section serving as a separate functional element that prevents longitudinal movement while the positive locking element at the bushing body prevents rotation and migration

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the bushing have different functions: the head section prevents longitudinal movement through its geometry, while the positive locking element at the bushing body end prevents rotation and migration through deformation into the component

Inventive Principle:

Principle #3Local quality

2Strength

If hydraulic pressing device is used to press bushing into component, then joining force is significantly increased, but a device specifically designed for this purpose is required

Engineering Contradiction:

Improvejoining forceVSAvoidspecialized pressing device

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The bushing structure itself (with head section and positive locking element) provides the necessary joining functionality, eliminating the need for specialized hydraulic pressing devices that were previously required to achieve sufficient joining force

Inventive Principle:

Principle #25Self-service

3Ease of manufacture

If glue is used to fasten socket to component, then joining force is achieved, but the joining force is low and application range is limited to no high loads

Engineering Contradiction:

Improvefastening methodVSAvoidjoining force

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The chemical bonding method (glue) is replaced with a mechanical joining system consisting of the head section and positive locking element, which provides significantly higher joining force while maintaining ease of manufacture through simple deformation processes

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Strength

If end-face groove is crimped to fasten bushing, then joining force is increased, but the method is limited to specific bushing designs with deep grooves

Engineering Contradiction:

Improvejoining forceVSAvoidapplication range

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The combination of head section and positive locking element creates a universal bushing design that can be applied across different bushing types and applications, providing reliable prevention of both longitudinal movement and rotation without requiring specific deep groove features

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 method effectively prevents longitudinal and rotational movement between the bushing and component, enhancing wear and corrosion protection while eliminating the need for additional tools and ensuring a strong, lasting connection.

Implementation Method 1

the positive locking element is produced by a mortising tool. In the mortising process according to the invention, simultaneous deformation of the positive locking element of the bushing can be achieved

Methodology Applied

Scientific EffectPlastic deformation: Plasticity

Implementation Method 2

bushings for wear or corrosion protection of components are thermally inserted

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentEP2647860B1Bushing for coupling with a component

Publication Date: 2023.12.06 LIEBHERR AEROSPACE LINDENBERG GMBH

Figure 1~2
Figure 5
Figure 6

AI summary

The bush (2) has a form-closure element integrally formed with a bush body (20) and/or a head portion (21) of the bush for deformation with the bush. The form-closure element is connected with a component (1) in a form-fit manner. The head portion is transversely extended with respect to a bush body. The form-closure element is provided at an end of the bush body opposite to the head portion. The form-closure element is formed as projection portions (23, 23') of the bush body and/or the head portion. An independent claim is also included for a method for avoiding a relative movement between a bush and a component coupled with the bush.