Electro-Hydrostatic Differential Cylinder Drive With Dual Operating Modes
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Solution Overview
Problem
Existing electro-hydrostatic drive systems are limited to only one movement sequence and often require many components or high power consumption, leading to increased initial and maintenance costs.
Innovation Solution
An electro-hydrostatic drive system with a hydraulic machine driven by an electric motor, featuring a variable volume and rotational speed, along with a differential cylinder and equalization container, allowing for operation in two flow directions and enabling both power and speed operating modes while reducing component count and power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing electro-hydrostatic drive systems are used, then one movement sequence is provided, but multiple movement sequences (power and speed operating modes) are not available
Solution Approach 1:
The hydraulic machine is designed to perform multiple functions: it operates as a pump during power operating mode and as a motor during speed operating mode. This dual functionality allows a single device to provide both power and speed movement sequences, eliminating the need for separate drive systems for each mode and reducing overall system complexity
2Adaptability or versatility
If other drive systems are used to provide multiple movement sequences, then power and speed operating modes are available, but component count and power consumption increase
Solution Approach 1:
The hydraulic fluid serves multiple purposes within the system: it transmits power during pump operation, stores energy in the equalization container during mode transitions, and drives the motor during speed operating mode. This self-service approach eliminates the need for additional power sources or energy storage devices, reducing overall power consumption while maintaining multiple operating modes
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 system effectively provides both power and speed operating modes with reduced component requirements and power consumption, enhancing efficiency, reliability, and lowering costs.
Implementation Method 1
a hydraulic machine (11) which is driven by an electric motor (10) and has a variable displacement and/or rotational speed. The hydraulic machine (11) serves to provide a variable volumetric flow rate of a hydraulic fluid
Implementation Method 2
the equalization container is a pressure vessel that, according to a further preferred embodiment, in addition to a predetermined pressure has a variable volume for the hydraulic fluid accommodated in the equalization container
Implementation Method 3
A differential cylinder is understood to mean a hydraulic cylinder in which the cylinder surfaces differ on the front and rear sides of the piston
Data Source
AI summary
The present invention relates to an electro-hydrostatic system (1) with a hydraulic machine (11) which is driven by an electric motor (10) and has a variable volume and/or rotational speed for providing a volumetric flow rate of a hydraulic fluid, a differential cylinder (20) with a piston surface and with an annular surface, and at least one equalization container (30, 37), wherein the drive system (1) has a closed hydraulic circuit and during operation has an overpressure relative to the environment by means of the hydraulic machine (11) and/or a pretensioning source (15, 37), and the drive system (1) provides a movement of the cylinder in a first direction by means of a volumetric flow rate of the hydraulic machine (11) and a volumetric flow rate from the equalization container (30, 37), and provides a movement in a second direction by means of a volumetric flow rate of the hydraulic machine (11) and a volumetric flow rate into the equalization container (30, 37), and a power operating mode and a speed operating mode are provided with the differential cylinder (20).