Brake Pressure Generator Axial Torque Support for Compact Packaging
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Solution Overview
Problem
Conventional brake boosters rely on engine vacuum, which is not available in future drive concepts, necessitating an electromechanically drivable brake pressure generator that occupies significant installation space, limiting its application, especially in autonomous driving.
Innovation Solution
An electromechanically drivable brake pressure generator with axial torque supports between the annulus gear and receptacle, converting rotational motion into hydraulic piston motion, allowing for a compact design with a larger gear ratio and smaller motor, utilizing a spindle-nut arrangement and form-fitting recesses for anti-twist protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional brake boosters are replaced with electromechanical brake pressure generators, then the system becomes suitable for autonomous driving and future drive concepts, but the installation space requirement increases
Solution Approach 1:
The patent applies dimensional change by reorienting the torque support from a radial arrangement to an axial arrangement. The torque support now extends in the axial direction of the planetary gear rather than radially outward, effectively utilizing the axial dimension to reduce the radial footprint and overall installation space of the brake pressure generator while maintaining its torque transmission function for autonomous driving applications
Solution Approach 2:
The torque support is segmented into multiple discrete elements distributed around the planetary gear. This segmentation allows for optimized space utilization and enables the torque transmission function to be achieved with a more compact overall structure, reducing the installation space requirement while maintaining adaptability for autonomous driving systems
2Volume of moving object
If the gear ratio is increased to reduce motor size, then the motor can be designed smaller, but the installation space for torque transmission components increases
Solution Approach 1:
The torque support is reconfigured to extend axially along the planetary gear rather than radially outward. This dimensional reorientation allows the system to accommodate a larger gear ratio (which requires larger annulus gear diameter) without increasing the radial installation footprint, enabling motor size reduction while maintaining compact overall dimensions
Solution Approach 2:
Instead of allowing the torque support to expand radially outward from the planetary gear, the design inverts the approach by having the torque support extend in the opposite direction - axially along the gear axis. This inversion enables the annulus gear to have a larger diameter for higher gear ratio while the torque transmission path occupies the axial dimension, keeping the radial installation space compact
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 reduces installation space while enabling a higher gear ratio, allowing for a more efficient and compact brake pressure generation system, suitable for autonomous driving applications.
Implementation Method 1
an electric motor (18), with the aid of which a driving rotational speed is generatable
Implementation Method 2
a planetary gear (22), which is driven on the input side by the electric motor to render a gear ratio of the driving rotational speed to be slow
Implementation Method 3
This is preferably designed via a spindle-nut arrangement, via which this rotatory motion is converted into a translatory motion of the hydraulic piston in a hydraulic cylinder
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, using which a driving rotational speed is generatable; a planetary gear, which is driven on the input side by the electric motor to convert the driving rotational speed of the electric motor into a slower rotational speed, the planetary gear including an annulus gear, accommodated rotatably fixedly thereto in an annulus gear receptacle; and a hydraulic module, which is connected to an output side of the planetary gear and using which a brake pressure is generatable. A torque support is situated between the annulus gear and the annulus gear receptacle, which extends in an axial direction to the planetary gear and which cooperates with a recess so that the annulus gear and the annulus gear receptacle are held rotatably fixedly with respect to one another.