Disc Brake Segmented Shoes and Dual Piston Actuation
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Solution Overview
Problem
Existing disc brake systems face challenges in combining high-performance service braking and parking braking functions efficiently, with existing solutions often leading to overheating and vibration issues due to the simultaneous engagement of multiple brake shoes during service braking, and inadequate force distribution during parking braking.
Innovation Solution
The disc brake system incorporates two actuating pistons for service braking and uses one actuating piston actuated by an electric motor for parking braking, with brake shoes spaced apart to prevent frictional contact and reduce heating, and a floating frame design with a compact electric motor and reduction gear for efficient force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple brake shoes are engaged simultaneously during service braking, then braking force is increased, but heat generation and vibration increase
Solution Approach 1:
The brake shoes are divided into multiple independent segments (first brake shoe, second brake shoe, third brake shoe) that can be selectively engaged or disengaged. This segmentation allows the system to distribute braking force across different shoes rather than engaging all simultaneously, reducing concentrated heat generation and vibration while maintaining sufficient total braking force.
2Force
If multiple brake shoes are engaged simultaneously during service braking, then braking force is increased, but vibration increases
Solution Approach 1:
The brake system is segmented into multiple independently controllable brake shoes. By selectively engaging specific shoes rather than all simultaneously, the system reduces vibration generation while maintaining adequate braking force through the coordinated action of individual shoes.
3Device complexity
If one actuating piston is used for parking braking, then component complexity is reduced, but force distribution may be inadequate
Solution Approach 1:
The single actuating piston is designed with dynamic capability to selectively actuate different brake shoes based on the braking situation. For parking braking, the piston can engage specific shoes (such as the first and second brake shoes) to provide adequate holding force, while the system remains simple in structure with only one piston component.
4Temperature
If brake shoes are spaced apart, then frictional contact and heating are reduced, but braking effectiveness may be compromised
Solution Approach 1:
The brake shoes are spaced apart as separate segments rather than being continuously engaged. This spacing reduces frictional contact and heat generation between the brake shoes and the brake disc. The segmented design allows selective engagement of individual shoes to maintain braking effectiveness when needed, while preventing continuous contact that would cause excessive heating.
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 configuration enables high-performance braking with reduced heat generation and vibration, effective force distribution, and efficient use of components, enhancing the disc brake's ability to hold a vehicle stationary during parking and provide emergency braking.
Implementation Method 1
the actuating piston is actuatable by means of an electric motor for carrying out a parking brake function
Implementation Method 2
a floating frame design with a compact electric motor and reduction gear for efficient force transmission
Implementation Method 3
brake shoes spaced apart to prevent frictional contact and reduce heating
Data Source
AI summary
The invention relates to a disc brake, comprising a brake carrier, a brake caliper, brake shoes, and an actuating piston. The brake carrier has at least one mounting point for mounting on a vehicle. The actuating piston is displaceably accommodated on the brake caliper and is actuatable for carrying out a service brake function of the disc brake. At least one further actuating piston is provided, which in the direction of its longitudinal axis is displaceably accommodated on the brake caliper. For carrying out the service brake function, the at least two actuating pistons are actuatable, and for carrying out a parking brake function, one of the actuating pistons is actuatable. The invention further relates to a disc brake system and a parking brake system.