Brake Caliper Bolt Guide Damping for Radial Play Noise
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Solution Overview
Problem
Vehicle brake bolt guides generate disturbing rattling noises due to large radial play caused by part tolerances, particularly in commercial vehicle disc brakes installed under seats, leading to noise emission issues.
Innovation Solution
Incorporating a damping element around the bolt, made of elastomeric material with a reinforcing element, to limit radial play and damp vibrations, which is integrated with the existing brake caliper as part of a sealing element, reducing noise emission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a bushing is used around the bolt to accommodate part tolerances, then the radial play is reduced, but rattling noises are generated due to the remaining play and component interactions
Solution Approach 1:
The patent combines a metal bushing for structural support and wear resistance with an elastomeric damping element for vibration absorption and noise reduction. This composite approach allows the bushing to maintain dimensional stability while the elastomeric material compensates for remaining radial play and dampens rattling noises, resolving the contradiction between achieving tight tolerances and eliminating noise.
Solution Approach 2:
The elastomeric damping element acts as an intermediary between the metal bushing and the bolt, absorbing vibrations and reducing the impact of radial play. This intermediate layer prevents direct contact and noise generation between the bushing and bolt while maintaining the necessary mechanical connection, thereby eliminating rattling noises without compromising the tolerance compensation function.
2Object-generated harmful factors
If additional damping elements are added to reduce noise, then noise emission is reduced, but device complexity increases
Solution Approach 1:
The patent merges the damping function with the existing sealing element by integrating an elastomeric damping element into the sealing element's structure. This combination allows the sealing element to perform both its original sealing function and the additional function of damping vibrations and reducing noise, thereby reducing noise emission without significantly increasing device complexity or component count.
Solution Approach 2:
The sealing element is designed to serve multiple functions: providing sealing protection against dirt and moisture, and simultaneously acting as a damping element to reduce vibrations and noise. This multi-functional design eliminates the need for separate damping components, reducing device complexity while achieving the noise reduction goal.
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 damping element significantly reduces noise emission by mitigating radial play and vibrations, providing a cost-effective solution that maintains the stability and wear resistance of the brake caliper components.
Implementation Method 1
The damping element is made of an elastomeric material... designed to damp a relative movement in the radial direction between the bolt and the bolt guide
Implementation Method 2
designed to damp a relative movement in the radial direction between the bolt and the bolt guide
Implementation Method 3
made of elastomeric material with a reinforcing element
Data Source
AI summary
A brake caliper (100) includes a bolt guide (110) for axially displacing the brake caliper (100) on a brake carrier. A bolt (122) is received axially displaceably in the bolt guide (110), the bolt (122) having a bushing (124) arranged around the bolt (122). In addition to the bushing (124) and adjacent thereto, the brake caliper (100) has at least one damping element (130), the damping element (130) circumferentially surrounding the bolt (122) and being designed to damp a relative movement in the radial direction between the bolt (122) and the bolt guide (110). A kit for a bolt guide (110) of a brake caliper (100) includes the bolt, the bushing, and the damping element.