Elastic Joint Body Collar Bushing Offset Prevents Loop Pinching
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Solution Overview
Problem
Elastic joint bodies with rigid collar bushing components often experience pinching of individual thread loops during assembly and operation, leading to reduced service life due to dynamic friction and wear, especially when using snap connections that require flexible materials.
Innovation Solution
The contact zone between bushing components is offset relative to the loop bundles, allowing the use of wear-resistant materials like metal and preventing pinching by positioning the contact zone away from the loop bundles, thus avoiding friction and wear between bushing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid collar bushing components are used, then wear resistance is improved, but pinching of thread loops occurs leading to reduced service life
Solution Approach 1:
The contact zone between bushing components is offset axially from the loop bundles by a distance greater than the diameter of an individual thread, creating spatial separation in the axial dimension. This dimensional offset prevents thread loops from entering the contact zone during assembly and operation, eliminating pinching while maintaining rigid wear-resistant materials.
2Ease of operation
If snap connections are used to assemble bushing components, then ease of assembly is improved, but flexible materials are required which are prone to wear
Solution Approach 1:
The bushing component is divided into multiple segments (first bushing component with axial stem section, second bushing component with radial collar section) that can be assembled separately. The loop bundles are wound first, then the bushing components are assembled around them in a defined sequence, allowing rigid materials to be used without requiring flexible snap-connection materials.
Solution Approach 2:
The loop bundles are wound and positioned on the bushings before the bushing components are fully assembled. This preliminary action ensures that the loop bundles are already in place and will not be pinched during the subsequent assembly of the bushing components, allowing rigid materials to be used.
3Volume of moving object
If bushing components are assembled close to loop bundles, then compactness is improved, but friction and wear between components increases
Solution Approach 1:
The contact zone is offset in the axial dimension from the loop bundles, creating a clear separation zone. This axial offset greater than the thread diameter eliminates friction and wear between the bushing components and thread loops while maintaining overall compactness through precise dimensional control.
Data Source
AI summary
An elastic joint body for a shaft arrangement for the articulated connection of two shaft sections includes a plurality of bushings disposed in the circumferential direction at predetermined angular distances relative to a central axis of the joint body, a plurality of loop bundles, and a rubber elastic casing. Each loop bundle loops around two adjacent bushings and each bushing is looped by at least two of the plurality of loop bundles. Each of the plurality of bushings is provided with a plurality of bushing components. A first bushing component has an axial shaft section against which one of the loop bundles rests and wherein a second bushing component has a radial collar section against which the loop bundle rests. The first bushing component rests, without fixing, against the second bushing component in a contact zone offset relative to the loop bundle in the axial direction.