Disc Brake Guide Rod Bushing for NVH and Friction Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle disc brake assemblies experience noise, vibration, and harshness due to contact between guide rods and the anchor bracket, which can be mitigated by using a bushing but increases manufacturing complexity or cost.
Innovation Solution
A bushing is adapted for use with a guide rod fastener in a vehicle disc brake assembly, reducing noise, vibration, and harshness without increasing manufacturing complexity or cost by evenly distributing the load and reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bushing is provided on one of the guide rods, then noise, vibration, and harshness are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by providing the bushing only on the leading guide rod where it is most needed to reduce noise, vibration, and harshness during brake application, while leaving the trailing guide rod without a bushing to maintain manufacturing simplicity. This selective application optimizes the balance between performance and manufacturing complexity.
2Object-affected harmful factors
If bushings are provided on all guide rods, then noise, vibration, and harshness are further reduced, but manufacturing cost increases
Solution Approach 1:
The patent applies partial action by providing the bushing on only one guide rod (the leading guide rod) rather than all guide rods. This partial application is sufficient to achieve the primary goal of reducing noise, vibration, and harshness during brake application, while avoiding the increased manufacturing costs that would result from installing bushings on all guide rods.
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 bushing effectively reduces noise, vibration, and harshness in vehicle disc brake assemblies while maintaining manufacturing efficiency and cost-effectiveness by providing a consistent and reduced friction interface between guide rods and the anchor bracket.
Implementation Method 1
The noise, vibration, and harshness may be reduced by providing an elastomeric rod bushing on at least one of the guide rods
Implementation Method 2
The bushing is installed between the guide rod and the bore of the anchor bracket in which the guide rod extends
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A vehicle disc brake assembly includes a brake caliper. The brake caliper has a lug through which a bore extends, the bore having an axis. A guide rod fastener extends through the bore and is secured to a guide rod. An elastic bushing is in the bore between the lug and the guide rod fastener, wherein a circumference of the bushing contacts the lug. A radial clearance is between the lug and the guide rod fastener. The radial clearance is perpendicular to the axis.