One-Piece Bridge Unit for Drum Brake Shoe Assembly
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Solution Overview
Problem
The production of drum brake shoes for utility vehicles is complex and prone to inaccuracies due to the high number of components, leading to increased fabrication and handling challenges, as well as tolerance issues during assembly.
Innovation Solution
A brake shoe design featuring a one-piece bridge unit formed from at least two bridge plates, which provides stiffness and eliminates assembly tolerances by being fixed to the lining plate via a form, force, or integral connection, allowing for simpler and more accurate production, and can be produced through deep-drawing, forging, or other methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple independent components (flanges or webs) are welded onto the lining plate, then the brake shoe structure is complete and functional, but the number of components increases leading to higher fabrication complexity and assembly tolerance accumulation
Solution Approach 1:
The patent merges multiple independent components (flanges or webs) into a single integrated bridge unit that is formed as one piece. This bridge unit comprises multiple bridge plates connected in a fixed spatial relationship, eliminating the need for separate welding operations and tolerance accumulation while maintaining all necessary functions for mounting and force introduction.
2Ease of manufacture
If multiple independent components are assembled together, then the brake shoe can be manufactured using standard fabrication processes, but the fabrication outlay and handling complexity increase
Solution Approach 1:
The bridge unit is manufactured as a single integrated component using deep-drawing processes, which can be efficiently automated. This eliminates multiple welding operations, reduces handling steps during assembly, and improves production efficiency while maintaining manufacturability through standard forming processes.
Solution Approach 2:
The patent changes the manufacturing parameter from assembling multiple components to forming a single piece through deep-drawing. This parameter change transforms the production process from multi-step assembly to a more efficient single-step forming operation, improving productivity.
3Manufacturing precision
If bridge plates are positioned exactly relative to the lining plate and to each other, then the mounting and force introduction functions are accurate, but the positioning requirements increase fabrication complexity
Solution Approach 1:
By integrating all bridge plates into a single bridge unit, the patent eliminates the need for separate positioning operations between multiple components. The fixed spatial relationships within the one-piece construction ensure accurate positioning for mounting and force introduction functions without increasing fabrication complexity.
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 design simplifies the production and mounting process, reduces weight, and enhances stiffness and heat dissipation, resulting in a more efficient and cost-effective drum brake system with improved accuracy and reduced material usage.
Implementation Method 1
the bridge unit being formed as a one-piece body having at least two bridge plates... which advantageously impart the necessary stiffness to the entire arrangement
Implementation Method 2
The bridge unit can be fixed as a unit to the rear side of the lining plate with a form fit and/or force fit and/or an integral connection. It is preferably welded, for example.
Data Source
AI summary
Brake shoe, in particular of a drum brake for utility vehicles, includes a lining plate and a bridge unit, wherein the bridge unit is formed as a one-piece body comprising at least two bridge plates.