Clutch Outer Ring Engagement Assembly Without Welding

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Solution Overview

Problem

The existing clutch units require welding to attach the output-side outer ring member to the housing, leading to potential distortion and increased process complexity.

Innovation Solution

The clutch unit is assembled without welding by engaging the output-side outer ring member with the housing using engagement structures, eliminating the need for a welding process and reducing manufacturing complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If welding is used to attach the output-side outer ring member to the housing, then the attachment strength is improved, but distortion occurs due to heat and the number of processes increases

Engineering Contradiction:

Improveattachment strengthVSAvoiddistortion

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The patent replaces the welding process (thermal connection method) with a mechanical engagement system consisting of engagement protrusions and engagement grooves. This mechanical substitution eliminates heat-related distortion while maintaining attachment strength through precise geometric interlocking between the output-side outer ring member and the housing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Strength

If welding is used to attach the output-side outer ring member to the housing, then the attachment strength is improved, but the number of processes increases

Engineering Contradiction:

Improveattachment strengthVSAvoidnumber of processes

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent eliminates the welding process by implementing a mechanical engagement system with protrusions and grooves. This substitution reduces the number of manufacturing processes while maintaining attachment strength, as the mechanical interlocking can be achieved through simple assembly operations rather than requiring thermal processing equipment and procedures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If engagement protrusions and grooves are used to attach the output-side outer ring member to the housing, then distortion is prevented and manufacturing is simplified, but the attachment mechanism becomes more complex

Engineering Contradiction:

Improvedistortion preventionVSAvoidengagement structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The engagement mechanism is segmented into distinct functional elements: engagement protrusions on the output-side outer ring member and corresponding engagement grooves on the housing. This segmentation allows for modular design and manufacturing of the components, where the complexity is distributed across separate elements rather than requiring a complex integrated structure, thereby reducing overall manufacturing complexity while maintaining precision.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4286703B1Clutch unit

Publication Date: 2026.03.04 TOYOTA BOSHOKU KK

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AI summary

Provided is a clutch unit in which an output-side outer ring member is attached to a base plate without welding. A clutch unit (100) includes an output-side clutch (60) and a housing (11) that accommodates the output-side clutch (60). The output-side clutch (60) includes an output-side outer ring member (62). The output-side outer ring member (62) and the housing (11) have an engagement protrusion (62s) and an engagement groove (11s) that engage with each other to restrict relative rotation therebetween.