Progressive Damping Bushing for Commercial Vehicle Disc Brake
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Solution Overview
Problem
Existing disc brakes for commercial vehicles with sliding-caliper designs suffer from clattering noises due to inadequate damping under radial loading, leading to reduced operating comfort and service life, especially in mobile operations.
Innovation Solution
A disc brake design featuring radially elastic damping bushings with progressive damping behavior, characterized by grooves and ribs that adapt to radial loads, preventing clashing and noise by ensuring reliable clamping of radial loads and improving guidance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If damping bushings with uniform cross-section ribs are used, then the structure is simple and easy to manufacture, but the damping capability is insufficient under heavy radial loading, causing clattering noises
Solution Approach 1:
The damping bushing features ribs with varying cross-sectional areas along its length. The rib cross-sectional area increases in the direction of the guide bar axis, creating zones with different damping characteristics. This local variation in geometry allows the bushing to provide adequate damping under heavy radial loads while maintaining manufacturability through a single-piece construction without complex internal structures.
2Force
If the damping bushing is compressed under heavy radial loading, then the radial damping force increases, but the metal bearing bush contacts the guide bar directly, causing clattering noises
Solution Approach 1:
The damping bushing is designed with ribs whose cross-sectional area varies along the guide bar axis. This geometric parameter variation creates a progressive damping characteristic where the bushing compresses in a controlled manner under radial load. The changing rib geometry ensures that the bushing maintains sufficient compression and damping force without fully collapsing, thereby preventing direct metal-to-metal contact between the bearing bush and guide bar while still providing adequate radial damping under heavy loads.
3Manufacturing precision
If a fixed bearing with small sliding play is used, then the guidance precision is improved, but the service life is reduced due to increased mechanical loading and clashing
Solution Approach 1:
The varying rib cross-sectional area along the guide bar axis creates zones with different stiffness characteristics. This progressive damping design allows the bearing bush to maintain stable guidance with minimal sliding play while distributing mechanical loads more evenly along the contact length. The increased damping capacity prevents sudden shocks and clashing, thereby extending the service life of the fixed bearing without sacrificing guidance precision.
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 progressive damping bushings effectively eliminate clattering noises and enhance the service life of components by ensuring reliable damping and improved guidance, maintaining comfort and longevity without additional costs, especially in series production.
Implementation Method 1
radially elastic damping bushing which surrounds in zones the guide bar and has grooves delimited laterally by ribs. The damping bushing is configured to have a progressive damping behavior in a radial loading direction.
Implementation Method 2
radially elastic damping bushing... configured to have a progressive damping behavior in a radial loading direction... effectively eliminate clattering noises
Data Source
AI summary
A disc brake for a commercial vehicle has a caliper that straddles a brake disc. The caliper is mounted on a brake carrier on the vehicle side by way of two connecting bearings in an axially displaceable manner in relation to the brake disc. The connecting bearings each include a guide bar that is securely connected to the brake carrier and guided in a slide bearing of the caliper for the axial displacement thereof. At least one connecting bearing is provided with a radially elastic damping bushing, which at least surrounds the guide bar in regions and has grooves that are laterally delimited by ribs. The disc brake is designed such that the damping bushing has a progressive damping behavior in the radial loading direction.