Segmented Friction Lining Layout for Lower Fastener Load
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Solution Overview
Problem
Sintered friction linings used in brake and clutch applications have limited durability under high mechanical loads due to poor absorption of tensile and bending forces, necessitating the use of carrier plates for support, which increases the size and weight of the friction device.
Innovation Solution
The friction device is designed with a specific ratio of diameters for fastening elements, distributing centrifugal/shear forces evenly and reducing the size of recesses, allowing for a larger friction surface or smaller device size, and incorporating angled fastening elements and recesses in the friction linings to manage thermal wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If sintered friction linings are optimized for friction force, then friction performance is improved, but tensile and bending force absorption remains poor
Solution Approach 1:
The friction lining is divided into multiple segments that can move independently relative to each other, allowing each segment to accommodate tensile and bending forces separately while maintaining overall friction performance
Solution Approach 2:
The invention uses a composite structure combining sintered friction lining material with a flexible carrier or backing layer that provides tensile and bending strength while the sintered material maintains friction characteristics
2Reliability
If carrier plates are used to support friction linings, then durability is improved, but device size and weight increase
Solution Approach 1:
The invention replaces rigid carrier plates with flexible thin-film carriers or backing layers that provide sufficient mechanical support for durability while minimizing weight and device size
Solution Approach 2:
The carrier structure is designed to be dynamically adaptable, flexing and deforming under load rather than requiring rigid support, thereby reducing the need for heavy carrier plates
3Ease of manufacture
If boreholes are located in the friction surface area, then fastening is simplified, but friction surface area is reduced
Solution Approach 1:
The invention moves fastening elements from the friction surface plane to the backside or edge dimensions of the friction lining, eliminating interference with the friction surface while maintaining fastening effectiveness
Solution Approach 2:
The invention introduces an intermediary carrier structure that provides attachment points away from the friction surface, allowing fastening elements to be positioned optimally without compromising friction area
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 design reduces the load on fastening means, enables the use of shared components, and enhances the durability of the friction device by distributing forces evenly and reducing wear, leading to a more efficient and compact friction system.
Implementation Method 1
the loads exercised on the friction linings and the friction device by centrifugal/shear forces may be reduced
Implementation Method 2
the loads exercised on the friction linings and the friction device by centrifugal/shear forces may be reduced
Implementation Method 3
different materials are mixed in variable proportions and subsequently sintered with a sintering process, which is known in principle, into a component of a desired shape
Implementation Method 4
the friction lining serves the primary function of a brake or a clutch, i.e. for transmitting a braking torque or a torque between the driving side and the driven side
Data Source
AI summary
A friction device has a carrier element and friction lining segments arranged thereon, wherein the friction lining segments each include one sintered friction lining arranged on a friction lining carrier, the friction lining carrier being connected to the carrier element by fastening elements, and several fastening elements being arranged per friction lining segment, wherein one fastening element is located on a first circular path having a first diameter, and one fastening element is located on a second circular path having a second diameter, and wherein the ratio of the first diameter of the first circular path to the second diameter of the second circular path is selected from a range from 1.2 to 1.5.