Hydrostatic Actuator Radial Bearing Simplification
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Solution Overview
Problem
Hydrostatic actuators in motor vehicles face challenges in cost-effective production, simplified component arrangement, improved manageability, and effective cooling of electronic control devices, as well as susceptibility to electromagnetic interference and temperature influences.
Innovation Solution
A hydrostatic actuator design featuring a rolling planetary transmission centered in the housing with a single radial bearing, integrated electronic control device for improved cooling, a rotation angle sensor with calibrated sensing magnets, electromagnetic shielding, and a compact pressure equalization system with a separate reserve volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rolling planetary transmission is guided radially in the housing, then the number of radial bearings is reduced, but the positioning and support of the transmission becomes more challenging
Solution Approach 1:
The patent combines the functions of multiple radial bearings into a single radial bearing by integrating the support function into the housing structure. The housing itself is designed to provide radial guidance for the rolling planetary transmission, merging the support function with the housing structure rather than using separate bearing components for each support point.
Solution Approach 2:
The housing is designed to serve multiple functions: it provides structural support, guides the rolling planetary transmission radially, and integrates the single radial bearing to support the spindle. This multi-functional design eliminates the need for additional dedicated support components.
2Extent of automation
If the electronic control device is integrated into the hydrostatic actuator, then control functionality is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The patent introduces a heat dissipation plate as an intermediary component between the electronic control device and the housing. This plate serves as a thermal conduit, transferring heat from the electronic control device to the housing which acts as a heat sink, thereby solving the heat dissipation problem while maintaining integration.
Solution Approach 2:
The housing itself is utilized as a heat sink to dissipate heat from the electronic control device. Instead of requiring an external cooling system, the housing structure serves the dual purpose of structural support and thermal management, allowing the integrated electronic control device to operate effectively.
3Volume of moving object
If the hydrostatic actuator is designed with compact construction, then space utilization is improved, but component arrangement and assembly become more difficult
Solution Approach 1:
The patent employs a nested arrangement where the rolling planetary transmission is positioned centrally within the housing, the electronic control device is integrated into the housing structure, and components are arranged in concentric or layered configurations. This nesting allows multiple components to occupy overlapping or adjacent spaces efficiently, achieving compact construction while maintaining accessibility for assembly.
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 component complexity, enhances cooling efficiency, minimizes electromagnetic interference, and maintains compact construction while providing a reliable and efficient hydrostatic actuation system.
Implementation Method 1
by a rolling planetary transmission that converts the rotary drive to an axial motion
Implementation Method 2
to form a heat sink from the electronic control device to the attaching device and from there into a normally cooler receiving component
Implementation Method 3
which transmits the built-up pressure through a pressure line to a pressure chamber of a slave cylinder
Data Source
AI summary
A hydrostatic actuator and an arrangement for attaching it to a receiving component are provided. The hydrostatic actuator has a master cylinder containing a housing and a piston movable axially within the housing which acts on a pressure chamber filled with a pressurizing agent. The piston is driven by a rotary-driven electric motor having a stator and a rotor, by a rolling planetary transmission that converts the rotary drive to an axial motion. In order to be able to produce such a hydrostatic actuator with little need for construction space, cost-effectively and with better quality, a supporting of the rolling planetary transmission is simplified, and the cooling and shielding of an electronic controller and the pressure behavior of the hydrostatic actuator is improved.