Brake Pressure Generator with Stepped Planetary Gearing
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Solution Overview
Problem
Conventional brake boosters rely on engine vacuum, which is not available in future driving concepts, necessitating alternative electromechanical brake pressure generators that can provide supporting power and actuating force, especially for autonomous driving.
Innovation Solution
An electromechanically drivable brake pressure generator using an electric motor, planetary gear set, and hydraulic module with stepped planets to generate brake pressure, reducing installation space and noise while offering design flexibility and high gear ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional vacuum brake booster is used, then it can provide boosting power using engine vacuum, but it cannot operate in future driving concepts where vacuum is no longer available
Solution Approach 1:
The patent replaces the vacuum-based mechanical boosting system with an electromechanical system using an electric motor to generate the actuating force. This substitution enables the brake pressure generator to operate independently of engine vacuum, making it suitable for future driving concepts including autonomous driving where traditional vacuum sources are unavailable.
2Volume of moving object
If a planetary gear set is used to achieve high gear ratio, then the installation space is reduced and noise is lowered, but the design complexity increases
Solution Approach 1:
The patent merges multiple gear stages into a single planetary gear set, combining the functions of multiple gears into one integrated unit. This consolidation achieves high gear ratios while reducing the overall number of components and installation space, despite the increased complexity of the planetary mechanism itself.
Solution Approach 2:
The planetary gear set employs a nested structure where planet gears are arranged around a sun gear, with the annulus gear enclosing the entire assembly. This nested configuration allows multiple gear elements to occupy a compact volume, achieving high gear ratios within a small installation space.
3Device complexity
If stepped planets are used in the planetary gear set, then the number of components is reduced and volume is decreased, but the manufacturing complexity increases
Solution Approach 1:
The patent combines multiple planet gears with different toothings into single stepped planets, merging several components into one. This reduces the total number of parts in the gear set while achieving the required gear ratios, though it increases the complexity of manufacturing each individual stepped planet 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
The solution provides a compact, low-noise brake pressure generator with high gear ratio capabilities, suitable for various applications, including autonomous driving, by converting rotary motion into translational motion of a hydraulic piston, enhancing performance density and reducing component count.
Implementation Method 1
a planetary gear set that is driven by the electric motor on the input side to decrease a gear ratio of the input speed
Implementation Method 2
a hydraulic module that is connected to the planetary gear set on the output side to generate a brake pressure
Data Source
AI summary
An electromechanically drivable brake pressure generator for a hydraulic braking system of a vehicle. The electromechanically drivable brake pressure generator includes an electric motor for generating a input speed, a planetary gear set that is driven by the electric motor on the input side to decrease a gear ratio of the input speed, and a hydraulic module that is connected to the planetary gear set on the output side to generate a brake pressure. The planetary gear set includes stepped planets that are connected to a sun wheel of the planetary gear set on the input side and to an output component of the planetary gear set on the output side.