Ventilated Brake Disk Damping Element Hook Fastening
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Solution Overview
Problem
Existing ventilated brake disk solutions fail to securely fasten damping elements, leading to relative movement and potential uncoupling due to centrifugal acceleration, which worsens resonance frequencies and noise issues.
Innovation Solution
A ventilated brake disk design featuring a damping element with a wavy profile and hook-shaped fastening portions that engage pins to prevent movement, ensuring a fixed position and secure coupling to the rotor, thereby optimizing vibration damping and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a wire or sheet damping element with wavy profile is axially interposed between two disks, then vibration damping and noise reduction are improved, but the damping element becomes loose and may uncouple due to centrifugal acceleration
Solution Approach 1:
The damping element is divided into distinct functional segments: a wavy intermediate portion for vibration damping and two straight fastening portions for secure attachment. This segmentation allows each part to perform its specific function optimally while working together as a unified solution.
Solution Approach 2:
The fastening portions extend radially outward from the axial plane of the wavy portion, transitioning from axial positioning to radial engagement with pins. This dimensional change enables the damping element to be securely fastened in the radial direction while maintaining its vibration damping function in the axial direction.
2Ease of operation
If the damping element is allowed to move relative to the rotor, then installation and adjustment become easier, but resonance frequencies increase and noise worsens
Solution Approach 1:
The fastening portions are pre-formed with hooks that engage with pins during assembly. This preliminary preparation of the fastening mechanism ensures that once installed, the damping element is immediately and securely fixed, preventing any relative movement that would cause resonance and noise.
3Reliability
If axial pre-load is increased to fasten the damping element, then secure coupling is improved, but the complexity of the assembly process increases
Solution Approach 1:
The solution replaces complex axial pre-loading mechanisms with a simpler radial hook-and-pin fastening system. The hooks on the fastening portions engage with pins protruding from the rotor, providing secure coupling through a straightforward mechanical engagement that does not require complex assembly tools or procedures.
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 secure fastening of the damping element effectively reduces noise and vibration by maintaining coupling under dynamic conditions, enhancing the brake disk's rotation balance and noise reduction.
Implementation Method 1
Mounting a damping element on the brake disk to dampen the vibration, and therefore, the noise
Implementation Method 2
The damping element (3) is defined by a wire or a sheet of elastically deformable material
Implementation Method 3
An undesired uncoupling of the damping element caused by the centrifugal acceleration can occur because of this relative movement
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A ventilated brake disk for a motor vehicle has a rotor provided with two disks having respective inner faces (6), which are axially spaced apart and are joined to each other through a plurality of pins (7), the radially outermost end areas of the two faces (6) axially define between them an annular passage (10), which houses the wavy intermediate portion (11) of a wire damping element (3), this intermediate portion (22) is elastically deformed in a direction parallel to the axis of the rotor so as to be forced against the disks, at its opposite ends, the wire damping element (3) ends with two fastening portions (13) which are radially inwardly bent with respect to the intermediate portion (11) and are hooked to respective pins (7).