Reluctance Drive Pump Device for Dual Hydraulic Circuits
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Solution Overview
Problem
Existing pump devices in motor vehicle brake systems have limitations in delivering high hydraulic pressure and efficiently operating multiple independent hydraulic circuits, particularly in emergency braking scenarios, due to their design and construction which often involve friction and complex control mechanisms.
Innovation Solution
A pump device with a linear reluctance drive and a dual piston configuration, where the armature is connected to two hydraulic chambers with separate fluid connections, allowing independent control of the pistons and hydraulic pressure application to two separate circuits, enhancing delivery volume and power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional piston pump driven by an electric motor is used, then the pump device can deliver hydraulic pressure, but the construction becomes complex and efficiency decreases due to friction and conversion of rotation movement into translation movement
Solution Approach 1:
The patent replaces the conventional electric motor with a linear reluctance drive that directly generates linear motion without requiring rotation-to-translation conversion. The linear drive consists of a stator with electromagnets and an armature that moves linearly along the axis, eliminating mechanical friction from gear or belt drive systems and improving energy efficiency while simplifying the mechanical construction.
Solution Approach 2:
The pump device is segmented into multiple independent hydraulic chambers (first and second hydraulic chambers) that can be controlled independently. Each chamber has its own fluid connections and can be actuated separately by the linear drive, allowing the system to handle multiple hydraulic circuits simultaneously while maintaining simple control mechanisms for each segment.
2Productivity
If a single pump piston is used, then the construction is simple, but the delivery volume is limited and cannot efficiently serve multiple independent hydraulic circuits
Solution Approach 1:
The pump piston is segmented into multiple independent pistons (first pump piston and second pump piston), each associated with a separate hydraulic chamber. This segmentation allows each piston to independently pump hydraulic fluid for different hydraulic circuits, significantly increasing the overall delivery volume and enabling the system to serve multiple independent circuits simultaneously.
Solution Approach 2:
The linear drive mechanism serves multiple functions by simultaneously actuating both the first pump piston and the second pump piston through the resilient element. A single drive system controls multiple hydraulic chambers, providing multi-functionality that increases productivity without proportionally increasing device complexity.
3Adaptability or versatility
If hydraulic chambers with separate fluid connections are provided for each circuit, then the ability to pressurize multiple independent hydraulic circuits is improved, but the device complexity increases
Solution Approach 1:
Multiple hydraulic chambers are merged into a single integrated pump device housing, sharing common structural elements and the linear drive mechanism. The first and second hydraulic chambers are positioned adjacent to each other and share the same linear drive, reducing overall device complexity while maintaining the versatility to pressurize multiple independent hydraulic circuits simultaneously.
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 enables a higher delivery volume and the ability to apply hydraulic pressure to two independent hydraulic circuits, improving the efficiency and reliability of the brake system by simplifying the construction and control of the pump device, while reducing costs and ensuring a compact design.
Implementation Method 1
If current is applied to the stator, there is produced a magnetic field which leads to the armature being urged into a neutral position
Implementation Method 2
the armature being urged into a neutral position in which the magnetic resistance for the magnetic flux of the magnetic circuit is minimal
Implementation Method 3
there is associated in this instance with the armature at least one resilient element which acts on the armature counter to this drive force of the reluctance drive
Data Source
AI summary
A pump device, in particular for a brake system of a motor vehicle, includes two hydraulic chambers, a linear drive, and a pump piston. Each of the chambers has at least two fluid connections. The pump piston interacts with the chambers. The linear drive is embodied as a reluctance drive and includes a longitudinally movable armature, a housing-fastened stator that is configured to receive current, and at least one spring element. The at least one spring element is associated with the armature, and is configured to counteract a drive force of the reluctance drive. The armature is connected to the pump piston.