Brake Pedal Reaction Force Layout for Precise Stroke Adjustment
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Solution Overview
Problem
Conventional vehicle brake systems with connected brake pedals and master cylinders face difficulties in adjusting the initial position and stroke amount due to aging deterioration, making it challenging to maintain optimal braking performance, especially with the brake pedal's limited mounting flexibility and potential interference from engine compartment components.
Innovation Solution
A vehicle brake device incorporating a brake pedal with a rotatable lever part, a housing, and a reaction force generator, where the reaction force is generated based on the stroke amount, allowing for easier adjustment and improved accuracy, and featuring a system with multiple actuators and sensors for controlled fluid pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional brake pedal and master cylinder connection is used, then the system structure is simple, but the adjustment of initial position and stroke amount becomes difficult due to aging deterioration
Solution Approach 1:
The brake device is divided into separate functional modules: a reaction force generator that produces artificial reaction force, a master cylinder, and a brake pedal assembly. This segmentation allows independent adjustment of the reaction force characteristics and stroke amount without affecting the entire system, resolving the adjustment difficulty caused by aging while maintaining overall system simplicity.
Solution Approach 2:
An artificial reaction force mechanism is introduced as an intermediary between the brake pedal and master cylinder. This intermediary component (reaction force generator) decouples the direct mechanical connection, enabling independent adjustment of pedal stroke and reaction force characteristics without requiring system-wide reconfiguration, thus solving the adjustment problem while adding minimal complexity.
2Adaptability or versatility
If the brake pedal mounting position is fixed, then the system structure is simplified, but the mounting flexibility is limited and interference from engine compartment components occurs
Solution Approach 1:
The brake pedal assembly is designed with dynamic positioning capabilities through adjustable linkages and mounting mechanisms. The lever part can be positioned at different angles and locations, allowing adaptation to various engine compartment layouts while maintaining a relatively simple overall system structure. This dynamic adjustability resolves the mounting flexibility issue without significantly increasing system complexity.
3Reliability
If multiple adjustment mechanisms are added to improve braking performance, then the braking performance is enhanced, but the number of system components increases
Solution Approach 1:
The reaction force generator and master cylinder are merged into an integrated assembly where the artificial reaction force mechanism is combined with the hydraulic pressure generation system. This merging allows multiple functions (reaction force generation, pressure generation, stroke adjustment) to be achieved within a unified structure, enhancing braking performance consistency while minimizing the increase in component count.
Solution Approach 2:
The reaction force generator serves multiple functions simultaneously: it provides artificial reaction force to improve pedal feel, enables independent stroke amount adjustment, and maintains consistent braking performance. This multi-functionality reduces the need for separate adjustment mechanisms, thereby enhancing reliability without significantly increasing the number of components.
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
Facilitates precise adjustment of the brake pedal, enhances braking performance by maintaining consistent reaction force, reduces the number of system components, and improves drivability by minimizing the impact of fluid viscosity changes and external factors, while ensuring redundancy for safe vehicle deceleration.
Implementation Method 1
The reaction force generator is connected to the housing and the lever part and generates a reaction force on the lever part in accordance with a stroke amount of the brake pedal
Data Source
AI summary
A vehicle brake device includes a brake pedal having a pedal part and a lever part rotatable about a rotational shaft according to an operation of the pedal part, a housing rotatably supporting the lever part and being located in a vehicle compartment of a vehicle and on a partition wall that separates an outside of the vehicle compartment and an inside of the vehicle compartment, and a reaction force generator connected to the housing and the lever part and configured to generate a reaction force on the lever part in accordance with a stroke amount of the brake pedal.