Commercial Vehicle Disc Brake Pad Resetting to Eliminate Rubbing Torque
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Solution Overview
Problem
Existing disc brakes for commercial vehicles experience residual rubbing torques after braking, leading to increased fuel consumption and reduced service life of brake components due to incomplete release of brake pads during driving, especially due to wobbling and vibrations.
Innovation Solution
A disc brake design featuring a sliding caliper with a central spreading device that synchronizes the resetting of both brake pads and the caliper, using resilient spreading elements engaging on pad carrier plates to ensure simultaneous and synchronized resetting, thereby eliminating residual rubbing torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resilient resetting element is used to displace the brake caliper into an initial position, then the brake caliper can be reset after braking, but reliable functioning is not permitted in all situations due to component tolerances and deformations
Solution Approach 1:
The brake caliper is designed with movable guide beams that allow dynamic adjustment of the caliper position relative to the brake disc. This dynamic structure enables the resetting device to adapt to varying component tolerances and deformations during operation, ensuring reliable resetting function across different operating conditions.
Solution Approach 2:
The resetting device utilizes elastic deformation of the guide beams to change geometric parameters during the resetting process. By allowing controlled deformation within elastic limits, the system adapts to tolerance variations and ensures consistent resetting performance despite manufacturing imperfections or thermal deformations.
2Stability of the object's composition
If the brake caliper remains in position after brake release, then the brake pads lie against the brake disc with rubbing action, but this causes increased fuel consumption and reduced service life
Solution Approach 1:
The resetting device is designed to automatically reset the brake caliper into the initial position with a small automatic resetting movement after brake release. This self-service mechanism eliminates the need for manual intervention and ensures the brake pads are properly separated from the brake disc, preventing residual rubbing torques and reducing energy loss during driving operation.
3Object-affected harmful factors
If the brake pads are released slightly during driving operation due to wobbling and vibrations, then some rubbing is prevented, but residual rubbing torques are not effectively eliminated
Solution Approach 1:
The resetting device performs a preliminary resetting action by displacing the brake caliper into the initial position before normal driving operation begins. This preliminary action ensures that the brake pads are properly separated from the brake disc surface, preventing residual rubbing torques from developing during subsequent driving operation despite wobbling or vibrations.
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 extends the service life of brake pads and brake discs, reduces operating costs, and ensures complete release of brake pads during driving, minimizing fuel consumption and wear on components.
Implementation Method 1
resilient spreading elements which engage on the pad carrier plates
Implementation Method 2
spreading device which engages on the brake pads and acts equally counter to the respective application direction
Data Source
AI summary
A disc brake includes a brake caliper that engages over a brake disc and is designed as a sliding caliper. The disc brake has two brake pads which are located in the brake caliper, can be moved in opposite directions and each of which has a pad backing plate with a friction lining secured thereon. An action-side or application-side brake pad of the two brake pads can be pressed against the brake disc by a brake application device with the aid of at least one brake plunger. The brake also includes at least one restoring device, by which the brake caliper can be returned after a displacement and release of the brakes caused by a braking action. The restoring device has a spreading device which engages on the brake pads lying opposite one another and which acts with an identical force in opposition to the respective application direction. The spreading device includes spring-loaded spreading elements, each engaging on its respective pad backing plate. The spreading device is located in the central opening and the spreading elements engage directly or indirectly, outside the friction linings, on at least two contact regions of the brake pads, the regions facing each other at a distance from the center. Each contact region has a contact surface and a support surface, on which surfaces the spreading elements are movably located.