Brake Disc Bell and Band Preload to Eliminate Rattle
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Solution Overview
Problem
Existing disc brake solutions experience rattling noises due to impacts between the braking band and the disc bell, and they do not effectively minimize axial and circumferential clearances, which also limits the compactness and space accommodation around the disc's rotation axis.
Innovation Solution
A disc brake design incorporating a braking band with radial teeth and a bell with axial teeth, where elastic elements are used to preload the band and bell in both axial and circumferential directions, minimizing clearances and impacts, and allowing for a compact axial design while maintaining mechanical strength and accommodating space for wheel hub components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If radial teeth of the braking band are coupled with axial teeth of the bell, then the connection structure is simple and production costs are low, but axial impacts and rattling noises occur between the braking band and bell
Solution Approach 1:
The patent introduces an elastic element as an intermediary component between the braking band and bell. This elastic element absorbs axial impacts and eliminates rattling noises while maintaining the simple toothed connection structure. The elastic element acts as a mediator that resolves the harmful interactions between the rigid toothed components.
Solution Approach 2:
The elastic element is pre-installed between the braking band and bell to provide beforehand cushioning against axial impacts. This preliminary cushioning measure prevents the occurrence of rattling noises and impact damages before they can occur during brake operation.
2Ease of operation
If clearance is guaranteed in axial direction between braking band and bell, then the braking band can slide axially to orient coplanar to pads during braking, but axial impacts occur between braking band and bell
Solution Approach 1:
The elastic element serves as an intermediary that allows axial sliding motion while preventing harmful impacts. It provides the necessary compliance to enable the braking band to orient coplanar to pads during braking without generating impact forces against the bell.
3Length of moving object
If compact axial design is implemented, then axial dimensions are reduced, but space for wheel hub components may be limited
Solution Approach 1:
The patent resolves this contradiction by optimizing the spatial arrangement of components in different dimensions. The elastic element is positioned to utilize circumferential and radial spaces, allowing compact axial design while preserving necessary volume for wheel hub components through three-dimensional space optimization.
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 significantly reduces rattling noises, minimizes clearances between the braking band and bell, and allows for a more compact axial design without compromising mechanical strength, while providing space for wheel hub components and efficient heat dissipation during braking.
Implementation Method 1
a plurality of elastic elements (11), suitable to elastically preload the braking band (2) with respect to said bell (6)
Data Source
Figure 1~2
Figure 3~4
Figure 4bis~5
AI summary
A disc (1) for disc brake comprising a braking band (2); a bell (6), suitable to form a connection with the wheel hub of a vehicle associable with the disc (1); a plurality of elastic elements (11), suitable to elastically bias said braking band (2), a plurality of radial teeth (7) housed in a plurality of bell seats (10), so that said internal bell surface (16) is locally aligned with a radially internal edge surface (17) of each radial tooth (7); each elastic element (11) of said plurality of elastic elements (11) is removably connected to at least one axial tooth (9) of said bell; each elastic element (11) of said plurality of elastic elements (11 ) embraces at least one portion of a first axial tooth side (18), of a second axial tooth side (19) and of a at least one circumferential tooth side (20) of at least one radial tooth (7) of the braking band (2), elastically preloading said at least one radial tooth (7) with respect to said bell (6).