Commercial Vehicle Drum Brake Toothing for Compact Torque Transfer
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Solution Overview
Problem
Drum brakes for commercial vehicles require a large installation space and suffer from non-uniform surface pressure due to the offset application of braking forces, leading to line contact between friction partners and potential shielding of the brake drum.
Innovation Solution
A drum brake design featuring a hub flange and brake drum flange with a positively interlocking toothing, transmitting braking torque through form fit rather than friction, and incorporating damping elements to compensate for tolerances and reduce noise, vibration, and harshness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake drum is connected to the hub flange using wheel studs and flange surfaces, then the connection is secure, but the installation space increases due to the addition of flange thicknesses
Solution Approach 1:
The invention extracts and eliminates the separate flange components (hub flange and brake drum flange) from the traditional connection design. Instead of using flange surfaces with wheel studs, the brake drum is connected directly to the hub via a toothing interface integrated into the brake drum body, removing the unnecessary flange thickness and reducing installation space while maintaining secure connection
Solution Approach 2:
The invention merges the connection function directly into the brake drum structure by integrating the toothing interface onto the brake drum's outer circumference. This combines the braking function and the mounting function into a single integrated component, eliminating the need for separate flange elements and reducing the overall axial dimension
2Stability of the object's composition
If the brake drum is secured at connection points by wheel bolts and nuts, then the connection is stable, but the force application creates shielding that prevents uniform surface pressure
Solution Approach 1:
The invention removes the wheel bolt and wheel nut connection elements from the brake drum interface. By eliminating these discrete fastening points, the shielding effect that caused non-uniform pressure distribution is removed, allowing the braking force to be distributed evenly across the entire friction surface without concentration at specific connection points
Solution Approach 2:
The invention segments the force transmission path by using multiple toothing engagement points distributed around the circumference of the brake drum. This distributes the connection stability function across multiple small engagement points rather than a few large fasteners, preventing localized shielding while maintaining overall connection stability
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 achieves a more compact brake structure, reduces weight, and improves braking performance by ensuring uniform surface pressure and reducing noise, vibration, and harshness, while allowing for easy assembly and disassembly.
Implementation Method 1
each of the resilient elements has two first regions running parallel to the side flanks of the teeth of the brake drum flange and a connecting web connecting the two first regions to one another
Implementation Method 2
damping elements are inserted between the side flanks of the teeth of the brake drum flange and the side flanks of the teeth of the hub flange. Preferably, the damping elements each comprise a resilient element and a plastically deformable element
Data Source
Figure 1~2
Figure 3~4
Figure 5~6b
AI summary
A drum brake (1) for a commercial vehicle has a hub (2) that can be fastened to a vehicle axle of the commercial vehicle, a brake drum (3) mounted on the hub (2) coaxially to a rotational axis (AR) of the hub (2), at least two brake pads (3) mounted in a receiving space (22) of the brake drum (2) and having an inner surface (33) designed as a friction surface, against which the brake pads can be pressed, wherein the hub (2) has a cylindrical axle holder (22) and a hub flange (21) extending radially therefrom, on which a brake drum flange (31) of the brake drum (3) is mounted in a rotationally and axially fixed manner, wherein the hub flange (21) and the brake drum flange (31) have a positively engaging toothing.