Electromechanical Brake Pressure Generator With Compact Planetary Gear Layout
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Solution Overview
Problem
Conventional electromechanical brake pressure generators are bulky due to a low conversion ratio in their multi-stage spur gear linkage, leading to a large physical size and increased component dimensions, which is not suitable for compact vehicle configurations.
Innovation Solution
A planetary gearset unit is used to achieve a high conversion ratio, allowing for a biaxial disposition of the drive motor and spindle drive unit, reducing the piston diameter of the hydraulic piston/cylinder unit and enabling a compact configuration, with a clear separation of mechanical and electrical connections for improved accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a multi-stage spur gear linkage is used for power transmission, then the conversion ratio is low, but the device becomes physically large and bulky
Solution Approach 1:
The patent replaces the conventional multi-stage spur gear linkage with a planetary gearset unit. This substitution achieves a high conversion ratio (i:5 to i:10) in a compact configuration, resolving the contradiction between achieving high power conversion and maintaining small physical dimensions. The planetary gear mechanism provides superior space utilization compared to sequential spur gears.
Solution Approach 2:
The planetary gearset unit employs a nested structure where planet gears are arranged around a sun gear within a ring gear, creating a compact multi-stage transmission system. This nesting approach allows multiple gear stages to occupy a small radial space, achieving high conversion ratios without increasing overall device volume.
2Power
If a high conversion ratio is achieved using conventional gear linkages, then component dimensions must be increased, but this increases the overall device size
Solution Approach 1:
The planetary gearset unit employs a nested structure where planet gears are arranged around a sun gear within a ring gear, creating a compact multi-stage transmission system. This nesting approach allows multiple gear stages to occupy a small radial space, achieving high conversion ratios without increasing overall device volume.
Solution Approach 2:
The patent transitions from a linear arrangement of spur gears to a radial planetary configuration. This dimensional change allows the gear train to expand in the radial direction rather than the axial direction, reducing the length of moving objects while maintaining high conversion ratio through the compact planetary structure.
3Volume of moving object
If the drive motor and spindle drive unit are arranged in a compact configuration, then space is saved, but accessibility for assembly and maintenance becomes difficult
Solution Approach 1:
The brake pressure generator is divided into modular components (drive motor, planetary gearset unit, spindle drive unit, hydraulic piston/cylinder unit) that can be assembled and disassembled independently. This segmentation allows compact overall arrangement while maintaining accessibility to individual components for assembly and maintenance operations.
Solution Approach 2:
The housing serves multiple functions: it provides structural support, defines the compact configuration of internal components, and incorporates features for assembly accessibility. This multi-functionality allows the same housing structure to achieve both compactness and ease of repair through integrated design features.
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 compact design reduces drive forces on components, enabling smaller dimensions and improved assembly accessibility, while maintaining effective power transfer for braking assistance, suitable for hybrid and electric vehicles.
Implementation Method 1
the gear linkage of an electromechanical braking force generator encompasses a planetary gearset unit (12) driven by a motor pinion (11) constituting a sun gear
Implementation Method 2
with incorporation of the high conversion ratio achievable utilizing the planetary gearset unit
Implementation Method 3
a spindle drive unit (1) for converting an input-drive-side rotational motion into a translational motion for piston actuation
Data Source
AI summary
An electromechanical brake pressure generator for a hydraulic braking system of a vehicle. The brake pressure generator has a spindle drive unit for converting an input-drive-side rotational motion into a translational motion for piston actuation of a hydraulic piston/cylinder unit. A multi-stage gear linkage is disposed between the spindle drive unit and an electric drive motor. The gear linkage encompasses a planetary gearset unit driven by a motor pinion constituting a sun gear, the output-drive-side ring gear of which unit drives the spindle drive unit. A motor shaft of the electric drive motor extends in adjacently parallel fashion next to a spindle drive shaft of the spindle drive unit.