Utility Vehicle Disc Brake Lining Clearance With Elastic Spreading
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Solution Overview
Problem
Disc brakes for utility vehicles often experience residual grinding due to brake linings not moving far enough away from the brake disc upon release, leading to friction and potential damage.
Innovation Solution
A spreading device with elastic restoring force, such as a spring wire or sheet, is used to move the brake linings apart, counteracting static friction and ensuring they lift off the disc, while a restoring device for the brake caliper creates space for proper clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake linings are coupled with magnet or tension spring to the caliper, then the brake lining is lifted from the brake disc when the caliper is reset, but the solution only functions when the caliper is reset and does not eliminate residual grinding under all operating conditions
Solution Approach 1:
The brake lining is divided into two independent parts: a functional braking surface and a spreading element. The spreading element is separated from the main lining body and can independently interact with the caliper or brake application device, allowing the lining to be lifted off the disc without requiring full caliper reset.
Solution Approach 2:
A spreading element acts as an intermediary between the brake lining and the caliper/application device. This intermediary component transmits the spreading force from the magnetic coupling or tension spring to the brake lining, enabling reliable clearance generation without complex direct coupling mechanisms.
2Power
If brake linings remain close to the brake disc to maintain braking contact, then braking force is maintained, but residual grinding occurs due to insufficient clearance upon brake release
Solution Approach 1:
The brake lining's position relative to the disc is made dynamic through the spreading mechanism. During braking, the lining contacts the disc for power transmission. During release, the magnetic coupling or tension spring dynamically lifts the lining away from the disc, eliminating residual grinding while maintaining braking capability when needed.
Solution Approach 2:
The axial position parameter of the brake lining is actively changed by the spreading element. The magnetic coupling strength or spring tension is adjusted to provide sufficient spreading force to lift the lining off the disc, transforming the static clearance problem into a controllable parameter change that eliminates harmful grinding contacts.
3Object-generated harmful factors
If spreading force is applied to lift brake linings off the brake disc, then residual grinding is eliminated, but additional device complexity is introduced
Solution Approach 1:
The magnetic coupling or tension spring in the spreading element utilizes the existing relative motion between the caliper and brake application device during normal brake operation to automatically generate the spreading force. The system serves itself by converting the necessary caliper reset motion into useful spreading action without requiring additional external actuation mechanisms.
Solution Approach 2:
The mechanical spreading mechanism is replaced with a magnetic coupling system or elastic tension spring system. These alternative systems generate the required spreading force through magnetic attraction or elastic deformation rather than complex mechanical linkages, reducing overall device complexity while maintaining effective brake lining clearance.
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 solution effectively reduces or eliminates residual grinding by ensuring both brake linings lift off the disc, even under external influences like impacts and vibrations, maintaining braking performance.
Implementation Method 1
A spreading device (18, 18') having a spreading force acting on the first and the second brake lining (14, 16) away from one another is provided. The spreading device is, according to the invention, preferably elastic. In other words, an elastic restoring force is used to spread the two brake linings.
Implementation Method 2
the first (reaction-side) brake lining has been coupled via a magnet or a tension spring in the axial direction with the brake caliper
Implementation Method 3
the first (reaction-side) brake lining has been coupled via a magnet or a tension spring in the axial direction with the brake caliper
Implementation Method 4
Disc brakes of the above-mentioned type are known. The problem often arises during operation that the two brake linings do not move far enough away from the brake disc after release of the brake. In other words, there is no 'clearance'. On the contrary, it occurs that one of the two brake linings or both brake linings bears/bear against the brake disc in a grinding manner.
Data Source
AI summary
A disc brake for utility vehicles includes a brake disc, a first brake lining on a first side of the brake disc and a second brake lining on a second side of the brake disc opposite the first side. A spreading device is also provided which generates a force that moves the first and the second brake lining away from one another.