Drum Brake Shoe Structure With Vibration-Damping Supports
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Solution Overview
Problem
Conventional drum brake shoes are prone to distortion and structural failure under high loads, leading to reduced performance and excessive vibration, which causes noise and potential warranty claims due to resonance with natural frequencies.
Innovation Solution
A brake shoe with a unitary body and integrated structural supports, including vibration dampers, is designed to withstand loads and reduce resonance, formed using additive manufacturing to achieve desired stiffness and vibration damping frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional brake shoes are used, then the structure is simple, but the brake shoe distorts under high loads leading to structural failure and reduced performance
Solution Approach 1:
The brake shoe is divided into multiple components including a shoe body, support, and vibration damper. The support connects the shoe body to the brake drum, while the vibration damper is integrated into the support structure. This segmentation allows each component to perform its specific function independently, improving overall strength and load resistance.
Solution Approach 2:
The brake shoe incorporates a composite structure combining rigid components (shoe body, support) with vibration damping materials. The support includes a vibration damper that can be made from materials with different mechanical properties to simultaneously provide structural strength and vibration absorption, resolving the contradiction between strength and complexity.
2Object-affected harmful factors
If conventional brake shoes are used, then manufacturing is simple, but vibrations resonate with natural frequencies causing noise and audible disturbances
Solution Approach 1:
The vibration damper acts as an intermediary element between the brake shoe body and the brake drum. It absorbs and dissipates vibration energy through material damping and hysteresis, preventing resonance with natural frequencies. The damper can include viscous materials, elastomers, or specially designed structural features that convert vibrational energy into heat.
Solution Approach 2:
The support structure is designed with adjustable geometric parameters such as thickness, length, and cross-sectional area to modify the natural frequencies of the brake shoe assembly. By changing these parameters, the resonance frequencies are shifted away from the operating frequency range, reducing vibration and noise.
3Ease of manufacture
If the brake shoe structure is simplified, then manufacturing is easier, but the brake shoe cannot withstand high loads without distortion
Solution Approach 1:
The support, vibration damper, and connection elements are merged into an integrated assembly that can be manufactured as a single unit or pre-assembled component. This merging reduces the number of separate parts and connection points, simplifying manufacturing while maintaining structural integrity and reliability under high loads.
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 brake shoe effectively resists distortion, reduces noise, and enhances performance by dampening vibrations, thereby improving operator satisfaction and reducing warranty claims.
Implementation Method 1
the support comprises a vibration damper configured to deflect from an unloaded position to a loaded position in the presence of a load and to return from the loaded position to the unloaded position in the absence of the load
Data Source
AI summary
A brake shoe for a drum brake includes a unitary body defining a brake table and one or more webs supporting the brake table. Each web has first and second ends. The first end is configured for pivotally coupling to an associated brake spider of the drum brake and the second end is configured to respond to a force applied by an actuator that causes the brake shoe to move between positions of engagement and disengagement with an associated braking surface. The unitary body further defines one or more supports extending between the two webs and/or between one of the webs and the brake table. In some embodiments, the supports comprise vibration dampers configured to deflect from an unloaded position to a loaded position in the presence of a load and to return to the unloaded position in the absence of the load.