Ceramic Brake Disk Relief Slots for Thermal Stress Reduction
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Solution Overview
Problem
Brake disks with ceramic friction rings experience significant thermal and mechanical stress due to temperature gradients between the fastening ring and the friction zone, leading to stress concentrations and potential mechanical failures.
Innovation Solution
The introduction of relief slots in the fastening ring of the ceramic friction ring, which connect radially to the friction zone, reduces thermal stress and mechanical stress concentrations by allowing thermal expansion and distributing torsional forces, while relief bores at the ends of these slots mitigate notch effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the fastening ring is rigidly connected to the friction ring, then mechanical strength is maintained, but thermal stress and stress concentrations increase due to temperature gradients
Solution Approach 1:
The fastening ring is segmented by introducing relief slots that radially divide the ring structure. These slots allow the fastening ring to expand and contract independently in response to thermal gradients, reducing thermal stress concentrations while maintaining overall structural integrity through the remaining material sections.
2Stability of the object's composition
If the fastening ring is rigidly connected to the friction ring, then structural integrity is maintained, but stress concentrations occur in the region of the bores
Solution Approach 1:
The relief slots segment the fastening ring structure, creating discrete regions that can deform independently. This segmentation redistributes stress away from concentration points at the bores, reducing peak stresses while the overall ring structure maintains structural integrity through the connecting material between slots.
3Stress or pressure
If relief slots are added to the fastening ring, then thermal stress is reduced, but notch effects may be caused
Solution Approach 1:
The relief slots are designed with specific geometric characteristics - their width, length, and positioning are optimized to provide stress relief while minimizing stress concentration at the slot edges. The slots are positioned and dimensioned to balance thermal stress reduction with avoidance of harmful notch effects, creating a locally optimized structure.
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 significantly reduces thermal stress and stress concentrations in the fastening ring region, enhancing the mechanical strength and durability of the brake disk, particularly around the fastening bores, and minimizes noise during brake application.
Implementation Method 1
The thermal stress caused by the different thermal expansion of the different friction ring regions is reduced by measures according to the invention
Implementation Method 2
During operation of the brake disk the friction ring heats up in a friction zone
Data Source
AI summary
The invention relates to a brake disk comprising a ceramic friction ring (4) and a connecting flange (6) that is disposed concentric to the friction ring (4). The friction ring (4) is provided with a fastening ring (8) in an interior area, which encompasses fastening bores (10). The friction ring (4) is joined to the connecting flange (6) at the fastening bores (10) by means of fixing means. The invention is characterized in that the friction ring (4) is provided with relief slots (12) between the fastening bores (10) in the fastening ring (8), said relief slots (12) radially extending from an interior area of the fastening ring (8) in the direction of a friction zone (20) of the friction ring (4).