Commercial Vehicle Disc Brake Restoring Device
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Solution Overview
Problem
Disc brakes in commercial vehicles experience increased fuel consumption and reduced component service life due to residual rubbing moments between brake pads and the brake disc during driving, which existing restoring devices fail to adequately address, especially under variable influences from component tolerances and deformations.
Innovation Solution
A disc brake design featuring a restoring device with two rods, a pull rod and a push rod, that counteract the brake pads' displacement after braking, using spring-loaded helical springs to restore the brake caliper to its starting position, thereby preventing residual rubbing by acting on the lining carrier plates of the brake pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a restoring device with a single rod is used, then the brake caliper can be restored after braking, but the service life of brake pads and brake disc is reduced due to residual rubbing moments
Solution Approach 1:
The restoring device is segmented into two separate rods (first rod and second rod) that act on different brake pads independently. This segmentation allows each rod to specifically address the restoring needs of its associated brake pad, ensuring complete elimination of residual rubbing moments on both sides of the brake disc.
Solution Approach 2:
The restoring device uses spring-loaded rods that can adjust their restoring force parameters. The springs are pre-loaded to provide sufficient restoring force to overcome component tolerances and deformations, ensuring the brake pads are completely separated from the brake disc during non-braking operation.
2Ease of manufacture
If component tolerances and deformations are present, then manufacturing is easier, but the restoring device fails to function reliably
Solution Approach 1:
The springs in the restoring device are pre-loaded during manufacturing to provide a predetermined restoring force. This preliminary action ensures that even when component tolerances and deformations occur during operation, the pre-loaded springs maintain sufficient restoring force to reliably return the brake caliper to its starting position.
Solution Approach 2:
The spring-loaded mechanism provides beforehand cushioning by absorbing variations caused by component tolerances and deformations. The elastic nature of the springs allows them to compensate for dimensional variations and maintain reliable restoring function across the full range of expected component variations.
3Stability of the object's composition
If brake pads bear in a rubbing manner against the brake disc during driving, then the brake caliper remains in position, but fuel consumption increases and service life is reduced
Solution Approach 1:
The restoring device operates automatically without requiring external intervention. The spring-loaded rods self-activate when the brake is released, using the stored elastic energy in the springs to push the brake caliper back to its starting position and separate the brake pads from the brake disc, eliminating residual rubbing automatically.
Solution Approach 2:
The restoring device changes the position parameter of the brake caliper from the braked position to the starting position where brake pads are separated from the brake disc. This parameter change eliminates the harmful rubbing contact while maintaining the stability of the brake system during non-braking operation.
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 increases the service life of brake pads and brake discs while reducing operating costs by ensuring the brake caliper returns to a position where the pads do not rub against the disc during driving, thus minimizing fuel consumption and wear.
Implementation Method 1
The restoring device has at least two rods which bear against the brake pads in a spring-loaded manner
Implementation Method 2
spring-loaded helical springs to restore the brake caliper
Implementation Method 3
Each brake pad has a lining carrier plate and a friction lining fastened thereon
Data Source
AI summary
A disc brake for a commercial vehicle has a brake caliper, which straddles a brake disc and is designed as a sliding caliper and is fastened to a stationary brake carrier, two brake pads, which are arranged in the brake caliper and can be moved in opposite directions and which each have a backing plate and a friction lining fastened to the backing plate, of which brake pads an action-side brake pad can be pressed against the brake disc by an application device via a brake piston, and at least one restoring device, by which the brake caliper can be restored after a braking-related displacement and release of the brake. The disc brake is designed such that the restoring device has at least two rods, which lie against the brake pads with spring loading against the respective application directions of the brake pads, of which rods one is designed as a pulling rod and the other is designed as a pushing rod.