Brake Actuating Unit Orthogonal Motor Integration
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Solution Overview
Problem
Existing brake systems for motor vehicles, particularly in brake-by-wire systems, face challenges in achieving a compact design that allows for efficient integration of brake actuation and pressure modulation, leading to increased weight, complex installation, and potential safety issues in crash situations.
Innovation Solution
The brake actuating unit integrates the driver-operable cylinder piston arrangement, printhead center, and valve arrangement within a single housing with orthogonal alignment of the electric motor, allowing for a compact and lightweight design that reduces the overall construction length and enhances safety by minimizing space requirements and facilitating easier installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If brake actuation and pressure modulation are integrated into a single module, then weight is reduced and manufacturing is simplified, but the arrangement complexity increases
Solution Approach 1:
The patent integrates the brake actuation unit and pressure modulation unit into a single common housing, combining previously separate modules. This merging reduces overall weight, simplifies manufacturing processes, and decreases the number of connection points required, while the orthogonal arrangement manages the internal complexity.
Solution Approach 2:
The patent employs orthogonal arrangement where the axis of the electric motor is positioned perpendicular to the longitudinal axis of the first cylinder-piston assembly. This dimensional reorganization allows compact integration of multiple components within the single housing, managing arrangement complexity through spatial optimization.
2Length of stationary object
If the electric motor axis is arranged perpendicular to the first cylinder-piston assembly, then the overall length is reduced for better crash performance, but the installation precision requirements increase
Solution Approach 1:
By arranging the electric motor axis perpendicular to the first cylinder-piston assembly, the patent reduces the overall length in the primary direction while utilizing the orthogonal dimension for component placement. This dimensional change achieves compactness for crash performance while the standardized orthogonal interface manages installation precision requirements.
Solution Approach 2:
The common housing serves multiple functions: it contains the first cylinder-piston assembly, the pressure supply device with second cylinder-piston assembly, the valve assembly, and provides mounting surfaces for electrical and hydraulic connections. This multi-functionality reduces the need for additional precision-machined interfaces.
3Adaptability or versatility
If multiple components are integrated into a single housing, then adaptability to vehicle packaging is improved, but the internal space utilization challenges increase
Solution Approach 1:
The orthogonal arrangement of the electric motor perpendicular to the first cylinder-piston assembly allows the components to be packed more efficiently within the housing volume. This spatial reorganization improves adaptability to various vehicle packaging constraints while optimizing internal space utilization through three-dimensional component layout.
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 configuration results in weight savings, improved safety during crashes, and enhanced adaptability to various vehicle packaging, while providing a comfortable brake pedal feel through integrated simulation devices and efficient hydraulic and electrical connections.
Implementation Method 1
an electric motor (7), which can be actuated by electrical signals
Implementation Method 2
a first hydraulic cylinder-piston assembly (3), which can be actuated by a driver by means of a push rod (2)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Brake actuating unit (1, 1') for a motor-vehicle brake system of the "brake-by-wire" type having a housing (10), a first hydraulic cylinder/piston arrangement (3) with an actuating piston which is displaceably guided in the housing (10) and delimits a hydraulic pressure chamber, to which wheel brakes of the motor vehicle can be connected, wherein the actuating piston can be actuated by means of a push rod (2) which transmits actuating forces, the brake actuating unit further having an electrically controllable pressure supplying device (6) which is designed as a second hydraulic cylinder/piston arrangement (12), the piston of which can be displaced by an electric motor (7) by means of a rotational/translational gear mechanism (9), and a valve arrangement (4) including a number of valves (41, 42, 43) for setting wheel-individual brake pressures and for disconnecting or connecting the wheel brakes from/to the first cylinder/piston arrangement (3) or from/to the pressure supplying device (6), wherein the valve arrangement (4) and the pressure supplying device (6) are arranged at least partially within the housing (10), and wherein the axis of the electric motor (7) of the pressure supplying device (6) is arranged substantially perpendicular to the longitudinal axis (30) of the first cylinder/piston arrangement (3).