Co-Moulded Bearing Casing Ring to Prevent Surface Marks

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Solution Overview

Problem

Existing food casing designs for rotating shafts in the F&B industry are prone to breakage under unforeseen loads and leave visible defects that compromise food safety, especially when reinforced with visible elastic means.

Innovation Solution

A polymeric casing reinforced with a co-moulded metallic ring around the spherical seat, using precise positioning pins and elastomer filling to ensure structural strength and hide visible marks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the casing is reinforced with an elastic means (e.g., spiral spring) co-moulded together with the casing, then the mechanical strength and breakage load are improved, but visible marks (pinoles or burring) appear on the surface where the elastic means has been inserted

Engineering Contradiction:

Improvemechanical strengthVSAvoidvisible surface marks

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent changes the material parameter of the reinforcement from elastic material to metallic material (such as stainless steel). This metallic ring provides equivalent or superior mechanical strength while being compatible with the co-moulding process and not creating visible surface defects, thus resolving the contradiction between strength enhancement and surface quality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite structure by co-moulding a metallic ring reinforcement into the polymeric casing material. This composite approach combines the strength benefits of metal with the manufacturing advantages of injection moulding, achieving both mechanical reinforcement and surface integrity without visible marks

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If the casing is reinforced with a metallic ring co-moulded around the spherical seat, then the rigidity and resistance test performance are improved, but the manufacturing process complexity increases

Engineering Contradiction:

ImproverigidityVSAvoidmanufacturing process complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The metallic ring is positioned and prepared in advance within the mould cavity before the polymeric material is injected. This preliminary positioning ensures the ring is correctly placed around the spherical seat, and the subsequent co-moulding process integrates it seamlessly, achieving rigid reinforcement without requiring complex post-manufacturing assembly operations

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent merges the reinforcement installation step with the casing manufacturing step by co-moulding the metallic ring directly into the polymeric material during injection moulding. This integration eliminates separate reinforcement installation operations and achieves both structural rigidity and manufacturing efficiency in a single process

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4039996B1Reinforced casing for food applications

Publication Date: 2026.04.22 AB SKF SKF PATENT DEPARTMENT

Figure 1

AI summary

Casing (10) of a bearing unit for food applications, made of polymeric material and provided internally with a spherical seat (30) for housing the bearing unit, the casing (10) having a reinforcement in the form of a metal ring (20) co-moulded inside the casing (10) and accommodated around the spherical seat (30) of the casing (10).