Brake Disk Friction Ring Linking Element Thermal Expansion
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Solution Overview
Problem
Existing brake disk designs with friction rings and linking elements either fail to allow for radial and axial expansion, leading to mechanical stress during braking, or result in corrosion due to direct contact between dissimilar materials.
Innovation Solution
A threaded fastener arrangement with an intermediate element that encloses a sliding block, preventing direct contact and providing resilient force for axial expansion, while allowing radial expansion through oblong recesses and U-shaped design to accommodate thermal changes and prevent material deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct contact between friction ring and linking element is allowed, then structural simplicity is maintained, but corrosion occurs between dissimilar materials
Solution Approach 1:
The patent introduces an intermediate element as a mediator between the friction ring and linking element. This intermediate element prevents direct contact between the dissimilar materials (ceramic friction ring and aluminum alloy linking element), thereby eliminating galvanic corrosion while maintaining structural integrity. The intermediate element is specifically designed to be corrosion-resistant and compatible with both components.
Solution Approach 2:
The connection structure is segmented into multiple distinct components: the friction ring, intermediate element, threaded fastener arrangement, and linking element. This segmentation allows each component to be optimized for its specific function and material properties, preventing direct contact between incompatible materials while maintaining overall structural coherence.
2Stability of the object's composition
If rigid connection between friction ring and linking element is used, then structural stability is improved, but thermal expansion stress increases
Solution Approach 1:
The patent transforms the rigid static connection into a dynamic adaptable connection. The threaded fastener arrangement with oblong recesses and sliding blocks allows the structure to dynamically adjust to thermal expansion and contraction during braking operations. This dynamic capability maintains structural stability while accommodating dimensional changes without generating excessive stress.
Solution Approach 2:
The connection structure incorporates parameters that change with temperature conditions. The oblong recesses and sliding blocks enable the assembly to change its effective dimensions and stress distribution as temperature varies during braking, allowing thermal expansion without creating damaging stress concentrations.
3Strength
If axial expansion is prevented, then structural rigidity is maintained, but thermal expansion stress increases
Solution Approach 1:
The intermediate element and threaded fastener arrangement create a semi-rigid connection that maintains structural rigidity under normal operating conditions while allowing controlled axial expansion during thermal cycles. The design transitions from a fully rigid connection to a semi-rigid one that adapts to thermal conditions.
4Weight of moving object
If dissimilar materials (ceramic and aluminum alloy) are used, then weight is reduced, but corrosion resistance decreases
Solution Approach 1:
The intermediate element serves as a protective intermediary between the ceramic friction ring and aluminum alloy linking element. This mediator prevents direct galvanic contact between the dissimilar materials, eliminating corrosion risks while allowing the lightweight material combination to be utilized for weight reduction.
Solution Approach 2:
The brake disk employs a composite material structure combining ceramic friction ring with aluminum alloy linking element, connected through a corrosion-resistant intermediate element. This composite approach achieves weight reduction through material optimization while the intermediate element ensures corrosion resistance across the material interface.
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
The solution reduces mechanical stress and prevents corrosion by enabling both axial and radial expansion, maintaining component integrity and reducing wear, especially when using ceramic and aluminum materials.
Implementation Method 1
The design of intermediate element provides a resilient force between friction ring and linking element in the axial direction
Implementation Method 2
The design of sliding block allows for thermal expansion of the friction ring and the linking element in radial direction
Data Source
AI summary
A brake disk with a friction ring (2) and a linking element (4) which are interconnected by a threaded fastener arrangement (6). The threaded fastener arrangement (6)encompasses a screw, a nut, and an intermediate element (12). The intermediate element (12) prevents direct contact between the friction ring (2) and the linking element (4). Also provided is a sleeve element (14) that is disposed on a shaft (16) of the screw (8). A sliding block (18) is plugged onto the sleeve element (14). The intermediate element (12)at least partly encloses the sliding block such that thermal expansions acting in a radial direction can be compensated by a relative movement between the sliding block (18) and the intermediate element (12). The intermediate element also has a springy effect in an axial direction, whereby mechanical and thermal stresses can be compensated in the axial direction.