Master Brake Cylinder Serial Spring Closing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional master brake cylinders compress the secondary spring device first during brake force transmission, leading to abrupt force stages and an uncomfortable braking experience for drivers, whereas the proposed solution reverses this by compressing the primary spring device first, ensuring a smoother force transition through a 'serial closing' of compensating bores.
Innovation Solution
The master brake cylinder design features a secondary spring device with a greater preload force than the primary spring device, causing the primary spring device to compress first while the secondary spring device remains uncompressed, resulting in a 'serial closing' of compensating bores instead of the conventional 'simultaneous closing', thereby smoothing the force transition and enhancing braking comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the secondary spring device is compressed first during brake force transmission (conventional design), then the compensating bores close simultaneously, but this results in abrupt force stages and uncomfortable braking experience
Solution Approach 1:
The patent inverts the conventional spring compression sequence by configuring the secondary spring device with a greater preload force than the primary spring device. This causes the primary spring to compress first, followed by the secondary spring, thereby inverting the compensating bore closing sequence from simultaneous to serial. This inversion eliminates the abrupt force stage and provides smooth braking force transmission, resolving the contradiction between braking comfort and device complexity.
Solution Approach 2:
The patent changes the preload force parameter of the spring devices, specifically setting the secondary spring's preload force greater than the primary spring's preload force. This parameter change fundamentally alters the compression sequence and force transmission characteristics, transforming the abrupt simultaneous closing into a smooth serial closing process, thereby improving braking comfort without significantly increasing device complexity.
2Ease of operation
If a vacuum brake booster is used to provide pedal feel characteristic, then driver feedback is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the vacuum brake booster component from the brake system by using the inverted spring compression sequence to generate the desired pedal feel characteristic. The serial closing of compensating bores naturally produces a smooth force progression that mimics the effect of a booster, thereby achieving improved driver feedback without the added complexity and cost of a separate booster component.
Solution Approach 2:
The patent creates a copy of the vacuum brake booster effect through the inverted spring compression mechanism. By configuring the springs to compress in sequence rather than simultaneously, the system replicates the smooth force progression and pedal feel characteristic typically provided by a vacuum booster, achieving the same functional outcome without requiring the actual booster component.
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 design provides a more comfortable braking experience by reducing noticeable force abruptness, allowing for a pedal feel characteristic that mimics a vacuum brake booster without the need for a physical booster, ensuring reliable operation and improved driver feedback.
Implementation Method 1
a primary spring device (20), which is preloaded with a first preload force (Fs1) between the primary piston component (14) and the secondary piston component (16) and a secondary spring device (22), which is preloaded with a second preload force (Fs2) between the secondary piston component (16) and a wall component (12a) of the master brake cylinder housing (12)
Data Source
AI summary
A master brake cylinder for a brake system of a vehicle having a master brake cylinder housing, a primary piston component, a secondary piston component, a primary spring device which is preloaded with a first preload force between the primary piston component and the secondary piston component, and a secondary spring device, which is preloaded with a second preload force between the secondary piston component and a wall component (of the master brake cylinder housing, with the second preload force of the secondary spring device being greater than the first preload force of the primary spring device. A brake device for a vehicle, a brake system for a vehicle, and a production method for a mater brake cylinder for a brake system of a vehicle are also described.