Integrated Brake Pressure Supply Unit for NVH and Packaging
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Solution Overview
Problem
Conventional brake hydraulic pressure control apparatuses suffer from noise, vibration, and harshness (NVH) issues due to separately assembled components, leading to an enlarged outer shape and compromised mountability.
Innovation Solution
Integration of a motor and pump element as a pressure supply unit with a hydraulic block, where the pump element is partially housed within the rotor, and a common damper is used to mitigate NVH, while the pump element is attached to the hydraulic block, reducing the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If components are separately assembled to the hydraulic block, then each component can be individually managed and maintained, but the outer shape of the apparatus becomes enlarged and NVH measures become complex
Solution Approach 1:
The pump element is integrated into the rotor of the electric motor, forming a unified pressure supply unit. The motor shaft serves as the pump shaft, and the swash plate is commonly shared between the motor and pump element, eliminating the need for separate assembly of these components and reducing the overall apparatus volume.
Solution Approach 2:
The pump element is arranged inside the rotor of the electric motor, with the pump shaft nested within the motor shaft. This nested configuration allows the pump element to occupy the internal space of the motor, significantly compacting the overall structure while maintaining individual component functionality.
2Ease of manufacture
If components are separately assembled to the hydraulic block, then each component can be individually managed and maintained, but the measure against NVH becomes complex
Solution Approach 1:
The motor and pump element are merged into a single pressure supply unit with shared components (motor shaft as pump shaft, common swash plate). This consolidation reduces the number of separate NVH mitigation measures needed, as vibrations from the motor and pump are inherently coupled and can be managed through a unified damping approach.
Solution Approach 2:
The invention utilizes the inherent vibration and motion of the motor-pump system to drive the hydraulic pump operation. The periodic motion required for pumping is achieved through the motor-driven swash plate mechanism, converting what could be harmful vibrations into useful pumping action, thereby reducing the need for additional NVH mitigation components.
3Ease of manufacture
If components are separately assembled to the hydraulic block, then each component can be individually managed and maintained, but mountability of the apparatus deteriorates
Solution Approach 1:
The pressure supply unit combining the motor and pump element into a single integrated assembly with a compact outer shape improves mountability. The unified structure with shared components reduces the overall footprint and allows for more flexible installation positions on the vehicle while maintaining ease of assembly through standardized interfaces with the hydraulic block.
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 simplifies NVH mitigation and downsizes the apparatus, enhancing its mountability and reducing noise and vibration, thereby improving the overall performance and installation of the brake hydraulic pressure control system.
Implementation Method 1
a swash plate arranged to be tilted with respect to an axial direction of a rotation axis of the rotor
Data Source
AI summary
To provide a brake hydraulic pressure control apparatus capable of simplifying a measure against NVH and downsizing an outer shape of the apparatus.The brake hydraulic pressure control apparatus that controls a hydraulic pressure in each of plural systems of hydraulic circuits includes: a pressure supply unit that includes a motor and a pump element; and a hydraulic block that includes an oil channel connected to the pressure supply unit and control valves regulating the hydraulic pressure of each of the plural systems of the hydraulic circuits. The pressure supply unit includes: the motor including a stator and a rotor; a swash plate arranged to be tilted with respect to an axial direction of a rotation axis of the rotor; and the pump element having plural pump sections driven by rotation of the motor. At least a part of the pump element is arranged in the rotor.