Viscoelastic Damper for Disc Brake Piston Vibration
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Solution Overview
Problem
Vibrations generated during moderate braking in disc brake systems are bothersome and cannot be entirely eliminated, especially as vehicle components wear out, due to the interaction between brake pads and the rotating brake disc, leading to noticeable noise and discomfort.
Innovation Solution
A vibration damper made of viscoelastic material is integrated between the brake piston and pad, acting as a cylindrical element to absorb and dampen axial and parallel vibrations by utilizing its elastic properties to reduce the transmission of vibration forces during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a vibration damper with viscoelastic material is added between the brake piston and pad, then vibration and noise during moderate braking are reduced, but the device complexity increases
Solution Approach 1:
A vibration damper comprising a cylindrical element and a layer of viscoelastic material is introduced as an intermediary component between the brake piston and brake pad. This mediator absorbs and dissipates vibration energy through the viscoelastic layer's material properties, reducing the transmission of harmful vibrations to the brake pad and surrounding components while maintaining the essential braking function.
Solution Approach 2:
The vibration damper utilizes a composite structure combining a cylindrical element (metallic or plastic) with a layer of viscoelastic material. This composite design leverages the mechanical strength of the cylindrical element and the vibration-damping properties of the viscoelastic layer, creating an effective vibration reduction solution that addresses the harmful vibrations without excessive complexity.
2Power
If the brake piston directly contacts the brake pad, then braking force transmission is efficient, but vibrations are transmitted directly causing noise and discomfort
Solution Approach 1:
The vibration damper serves as a mediator positioned between the brake piston and brake pad, allowing the viscoelastic material to attenuate vibration energy while still permitting effective transmission of braking force. The cylindrical element maintains structural integrity and force transmission, while the viscoelastic layer selectively dampens high-frequency vibrations.
Solution Approach 2:
The viscoelastic material's ability to change its mechanical parameters (stiffness and damping characteristics) based on temperature and strain rate allows it to effectively transmit braking force during normal operation while dissipating vibration energy. The material's viscoelastic properties enable it to adapt its response to different braking conditions.
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 viscoelastic damping element effectively reduces vibrations and noise during braking, particularly during moderate braking phases, by absorbing and dissipating energy, thereby enhancing the comfort and quietness of the braking experience.
Implementation Method 1
A vibration damper made of viscoelastic material is integrated between the brake piston and pad, acting as a cylindrical element to absorb and dampen axial and parallel vibrations by utilizing its elastic properties to reduce the transmission of vibration forces during braking.
Implementation Method 2
The viscoelastic damping element effectively reduces vibrations and noise during braking, particularly during moderate braking phases, by absorbing and dissipating energy
Data Source
Figure 1~2
AI summary
The invention relates to a vibration damper for a disc brake comprising a cylindrical element (4) having on its cylindrical peripheral surface (41) a layer of a flexible material (5) exhibiting adhesion properties with the materials of the piston (3) and the cylindrical element (4). This cylindrical element (4) is intended to be placed inside the axial cavity (30) of the piston with said layer of flexible material (5) in contact with the inner wall (31) of the piston cavity (3). Application: Automotive brake