Disc Brake Caliper Resetting via Opposite Restoring Device
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Solution Overview
Problem
Existing disc brakes for commercial vehicles face issues with increased temperature and excessive wear due to brake pads rubbing against the disc when not in use, and previous solutions require complex modifications and are not effective in maintaining consistent retraction distance as brake pads wear.
Innovation Solution
A disc brake design with a restoring device positioned opposite the application device, utilizing a compression spring and friction bush for automatic caliper reset, allowing for minimal system rigidity intervention and easy wear adjustment, featuring a pressure piece and helical spring for tensioning and relaxation, and a friction bush with a profiled surface to overcome frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a restoring device is installed in the guide rail to automatically reset the brake caliper, then the brake pads can be prevented from rubbing against the brake disc, but the guide rail or plain bearing must be modified which requires special production engineering measures and increases device complexity
Solution Approach 1:
Instead of installing the restoring device in the guide rail as proposed in prior art, the invention inverts the approach by installing the restoring device directly in the brake caliper. This allows the brake caliper to reset automatically without modifying the guide rail or plain bearing, thereby reducing device complexity while maintaining the automatic reset function.
2Ease of operation
If the restoring element is formed from a leaf spring to pull the brake lining out of contact, then the brake pad can be retracted, but the characteristic curve changes greatly due to wear so constant retraction distance cannot be guaranteed
Solution Approach 1:
The invention replaces the leaf spring with a compression spring as the restoring element. The compression spring maintains a constant characteristic curve that is independent of brake pad wear, ensuring that the retraction distance remains constant throughout the service life of the brake pads. This parameter change from leaf spring to compression spring resolves the reliability issue.
3Power
If the brake caliper is pressed against the brake disc during braking, then braking force is generated, but the compression spring is compressed and the brake caliper must be moved against frictional forces
Solution Approach 1:
The invention utilizes the frictional forces between the friction bush and sleeve during the braking process. When the brake caliper is pressed against the brake disc, the compression spring is compressed and stores energy. The frictional forces prevent the sleeve from moving relative to the friction bush, ensuring that the spring energy is used effectively for resetting rather than being lost to unnecessary movement. This converts the potentially harmful frictional forces into a beneficial mechanism for energy management.
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 disc brake structure, extends the service life of brake pads and discs, reduces manufacturing complexity, and allows for easy replacement of components, while maintaining effective automatic resetting with minimal design and production effort.
Implementation Method 1
a restoring element (9) which consists of a compression spring (11) and a pressure piece (12), with which the brake caliper (1) is automatically brought into a starting position
Implementation Method 2
the compression spring is simultaneously tensioned, i.e. compressed up to a defined path, with the pressure piece resting on the brake carrier while the pressure plate is moved against the pressure spring
Implementation Method 3
If the defined clearance has not yet been overcome due to wear, i.e. the friction surface of the brake pad is not in contact with the brake disc (6), the brake caliper (1) is moved further, overcoming the frictional forces of the friction bushing (14)
Data Source
AI summary
A disc brake, in particular for a utility vehicle, with a brake calliper (1) which engages over a brake disc (6), is in the form of a sliding calliper and is fastened to an axially fixed component, in particular to a positionally fixed brake carrier (2), an application device (3) with which an associated, action-side brake lining (4) is pressable against the brake disc (6) during braking, and a resetting device (7) which has a resetting element and with which the brake calliper (1) can be brought into a starting position after a braking-induced displacement and release of the brake, wherein the resetting device (7) is held in the brake calliper (1) on that side of the brake disc (6) which is opposite the application device (3).