Utility Vehicle Disk Brake Guide Bar Locking Against Loosening
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Solution Overview
Problem
Disc brakes in utility vehicles face issues with guide bar loosening due to bending moments, leading to reduced axial pretensioning force and potential brake malfunction, despite the use of securing elements like washers and coatings, which do not provide sufficient friction to prevent twisting.
Innovation Solution
The implementation of guide bars with integrally formed impressing elements, such as toothing or knurling, on the front face that engage with the brake carrier to create a positive or frictional locking connection, independent of surface coatings, ensuring secure attachment and maintaining pretensioning force under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a screw connection with pretensioning is used to fasten the guide bar to the brake carrier, then the guide bar can be securely held in position, but bending moments during operation cause loosening of the screw connection
Solution Approach 1:
The patent applies preliminary action by creating impressing elements (toothing, knurling, or other surface structures) on the guide bar's front face before final assembly. These pre-formed surface features ensure that when the screw is tightened, the guide bar is immediately pressed into the brake carrier with sufficient friction and mechanical interlocking to prevent loosening under bending moments, eliminating the need for additional securing elements.
2Reliability
If securing elements like washers are used to prevent screw loosening, then some protection is provided, but they do not provide sufficient securing under operational loads
Solution Approach 1:
The patent changes the surface parameters of the guide bar by forming impressing elements (toothing, knurling, or other patterns) on the front face. This modifies the friction characteristics and mechanical interlocking capability between the guide bar and brake carrier, transforming a smooth surface into a high-friction, interlocking surface that provides sufficient securing strength without additional washers or securing elements.
3Strength
If the guide bar front face is hardened to improve durability, then wear resistance increases, but friction-based securing becomes insufficient
Solution Approach 1:
The patent applies local quality by creating impressing elements (toothing, knurling, or surface patterns) on specific regions of the guide bar's front face. These localized surface features provide high friction and mechanical interlocking exactly where contact with the brake carrier occurs, while the rest of the guide bar maintains its hardened properties for overall durability and wear resistance.
4Reliability
If surface coatings like zinc phosphate are applied to reduce friction, then coating protection is provided, but the frictional connection is reduced leading to increased loosening risk
Solution Approach 1:
The patent applies preliminary action by forming impressing elements (toothing, knurling, or surface structures) on the guide bar's front face before applying any protective coating. This ensures that the mechanical interlocking and friction-generating features are established first, and any subsequent coating does not fill or smooth over these critical surface features, maintaining both coating protection and sufficient frictional connection.
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
This solution effectively prevents guide bar loosening and maintains screw pretensioning force even under deformation, enhancing the operational and functional safety of disc brakes without requiring additional components or altering existing brake carriers.
Implementation Method 1
engage into the brake carrier in an impressed manner with the formation of a positively locking connection and/or a frictionally locking connection
Data Source
AI summary
The invention relates to a disk brake for a utility vehicle, comprising a brake caliper, which extends over a brake disk and which is slidably held on at least one guide bar, which is connected to a stationary brake bracket by means of a screw, wherein the screw is fed through the guide bar, is designed in such a way that the guide bar has impressing elements, which are formed on the end face of the guide bar that lies against the brake bracket, at least in a circumferential and/or radial partial region, which impressing elements engage into the brake bracket in an impressed manner in such a way that an interlocking connection and/or a frictional connection is formed.