Friction Element Recess Design for Wear Volume and Replaceability

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Solution Overview

Problem

Conventional friction linings in clutch disks have reduced wear volume due to rivet heads, making them non-replaceable and requiring entire clutch disc replacement when worn out, and existing solutions either eliminate rivet heads, reducing replaceability or increase installation space.

Innovation Solution

The friction elements are designed with a recess in the carrier element larger than the lining carrier, allowing deep-drawing of the lining carrier into the recess, which accommodates the connecting element head, thereby increasing wear volume and maintaining replaceability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If rivet heads are used to connect the lining carrier to the carrier element, then the connection strength is improved, but the wear volume of the friction lining is reduced

Engineering Contradiction:
Improveconnection strengthVSAvoidwear volume
Core Design Contradiction:
StrengthVSQuantity of substance

Solution Approach 1:

The invention resolves the contradiction by utilizing the axial dimension (depth) of the carrier element. Instead of allowing rivet heads to protrude into the friction lining radially, the rivet heads are positioned axially within a recess in the carrier element. This dimensional reorganization allows the connection strength to be maintained through rivet fixation while preserving the radial wear volume of the friction lining.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Quantity of substance

If rivet heads are eliminated to increase wear volume, then the wear volume is improved, but the replaceability of friction linings is reduced

Engineering Contradiction:
Improvewear volumeVSAvoidreplaceability
Core Design Contradiction:
Quantity of substanceVSEase of repair

Solution Approach 1:

The invention extracts the rivet heads from the friction lining area and places them within a recess in the carrier element. This separation allows the friction lining to be replaced independently without removing the rivet heads, as the rivets remain anchored in the carrier element's recess. The friction lining can be detached and reattached while the rivet heads stay in place, thus maintaining replaceability while maximizing wear volume.

Inventive Principle:
Principle #2Taking out (Extraction)

3Quantity of substance

If the recess in the carrier element is made larger to accommodate the connecting element head, then the wear volume is increased, but the axial installation space is increased

Engineering Contradiction:
Improvewear volumeVSAvoidaxial installation space
Core Design Contradiction:
Quantity of substanceVSLength of moving object

Solution Approach 1:

The invention optimizes the parameters of the recess in the carrier element by carefully controlling its depth and diameter. The recess is designed with specific dimensional parameters that allow it to accommodate the rivet heads while minimizing the axial space required. By adjusting the recess depth to be sufficient for rivet head placement but not excessive, and by optimizing the diameter to fit the rivet heads tightly, the invention increases wear volume while keeping axial installation space constraints satisfied.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentEP3036452B1Friction element
Publication Date: 2019.05.01 MIBA FRICTEC
  • EP3036452B1 patent drawingFigure 1~2
  • EP3036452B1 patent drawingFigure 3~4

AI summary

The invention relates to a friction element (8) comprising a friction lining (12, 13) that is connected to a lining carrier (14, 15), and comprising a carrier element, wherein said lining carrier (14, 15) is connected to the carrier element, and a connecting element (24, 25) is also used to connect the lining carrier (14, 15) to the carrier element, said connecting element being guided through a recess (26, 37) in the lining carrier (14, 15) and a recess (27, 38) in the carrier element, and having a connecting element head (27, 39) that is supported on the lining carrier (14, 15). The lining carrier (14, 15) has a shoulder (48, 49) in the region of the connecting element head (27, 39), the internal dimension (50, 51) of which shoulder is greater than the external dimension (30, 41) of the connecting element head (27, 38), such that at least part of the connecting element head (27, 38) is accommodated in said shoulder (48, 49).