Vehicle Brake System Draining Circuit Design
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Solution Overview
Problem
In vehicle brake systems with shared brake disc assemblies for service and parking brakes, existing anti-compounding solutions complicate the design by requiring adaptation of effective piston areas, leading to potential overload and damage due to combined forces.
Innovation Solution
A draining circuit that diverts service brake pressure to a return tank when the parking brake is engaged, using a non-return valve to prevent flow from the parking brake circuit to the service brake circuit, thereby avoiding overload without adapting piston areas and simplifying the design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If service brake and parking brake functions share brake assemblies, then space utilization is improved, but brake assembly overload risk increases
Solution Approach 1:
A draining circuit acts as an intermediary between the service brake circuit and parking brake circuit. When the parking brake is engaged, the draining circuit diverts service brake pressure to a return tank, preventing the叠加 of forces on the brake disc assembly. This mediator mechanism allows both brake functions to share the same brake assembly without causing overload.
2Object-affected harmful factors
If anti-compounding solution with double check valve assembly is used, then brake assembly overload is prevented, but device complexity increases
Solution Approach 1:
The invention extracts the draining function from the brake assembly design itself and implements it through a separate draining circuit. Instead of adapting piston areas within the brake assembly (which would complicate the assembly design), the solution takes out the pressure management function to a dedicated circuit with a non-return valve and return tank, simplifying the brake assembly while preventing overload.
3Force
If service brake pressure is allowed to act on engaged parking brake, then braking force is improved, but brake disc friction material damage occurs
Solution Approach 1:
The draining circuit implements preliminary anti-action by preemptively diverting service brake pressure away from the brake disc assembly when the parking brake is engaged. The non-return valve detects parking brake engagement and automatically routes service brake pressure to the return tank before it can combine with parking brake force, thereby protecting the friction material from overload damage while maintaining the ability to apply service brakes independently.
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 solution prevents brake disc assembly overload, provides flexibility in brake system design, and ensures reliable operation independent of electric valves or software control, even in power or control system failures.
Implementation Method 1
A draining circuit is provided in the vehicle brake system that is adapted to drain the service brake circuit when the parking brake circuit is drained, with a non-return valve to prevent flow from the parking brake circuit to the service brake circuit
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention provides a vehicle brake system (16) comprising - a brake assembly providing a service brake (1611) and a parking brake (1612) having a brake disc assembly in common, - a service brake circuit (163), - a parking brake circuit (164), and - a brake control arrangement (165, 1671, 1672, 1673, 1682) adapted to control the service brake (1611) by selectively providing a fluid communication between a pressurising arrangement (166) and the service brake (1611) via the service brake circuit (163), the brake control arrangement (165, 1671, 1672, 1673, 1682) further being adapted to control the parking brake (1612) by selectively providing a fluid communication between the pressurising arrangement (166) and the parking brake (1612) via the parking brake circuit (164), and by selectively draining the parking brake circuit (164), - wherein the vehicle brake system comprises a draining circuit (168) adapted to drain the service brake circuit (163) to avoid overload of the brake disc assembly.