Integrated Hydraulic Actuator with Pressure Amplifier for High Force
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Solution Overview
Problem
Compact hydraulic actuator arrangements face limitations in generating sufficient force to lift larger loads due to restricted pressure output, requiring additional energy sources and components that compromise their compact design.
Innovation Solution
Integrating a hydraulic pressure amplifier between the hydraulic pump and pressure chamber, with the pump and motor housed within the piston rod, allowing for increased pressure without additional space and enabling automatic activation for higher loads, and utilizing an accumulator and buffer tank for pressure balancing and temperature compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the hydraulic actuator arrangement is made compact, then the space requirement is reduced, but the force output capability deteriorates
Solution Approach 1:
The pump and motor are integrated within the piston rod internal volume, nesting components inside existing structural space rather than adding external components. This allows force enhancement components to be housed without increasing overall actuator volume.
Solution Approach 2:
A hydraulic pressure amplifier is introduced as an intermediary component between the pump and pressure chamber. This amplifier multiplies the pressure from the compact pump, enabling high force output from a small-volume pump motor assembly.
2Force
If additional energy sources or components are added to increase pressure, then the force output is improved, but the device complexity increases
Solution Approach 1:
The pump and motor are merged into a single integrated unit housed within the piston rod, eliminating the need for separate external power and hydraulic components. The pressure amplifier is also integrated within this same space, combining multiple functions in one location.
Solution Approach 2:
The system uses its own internal hydraulic fluid and pressure chambers to power the pump and operate the pressure amplifier, eliminating the need for external energy sources. The actuator serves itself by using its operating fluid to drive the pump motor assembly.
3Volume of moving object
If the motor is integrated within the piston rod, then the compactness is maintained, but the motor cooling capability deteriorates
Solution Approach 1:
The motor is cooled by circulating hydraulic fluid through channels within the piston rod structure. This uses the existing hydraulic system fluid to provide cooling, eliminating the need for separate cooling mechanisms while maintaining compact integration.
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
Enables the hydraulic actuator to produce larger forces without additional energy sources or components, maintaining compactness and preventing overheating through integrated cooling and efficient pressure management.
Implementation Method 1
The hydraulic pressure amplifier can be used to increase the pressure supplied to the pressure chamber, so that the hydraulic actuator arrangement can be used despite its compactness to produce lager forces
Implementation Method 2
The accumulator is used to balance the oil volume when the pressure chamber and a retraction chamber have different pressure areas
Implementation Method 3
an electric motor driving the hydraulic pump
Implementation Method 4
a hydraulic pump connected to the pressure chamber
Data Source
AI summary
A hydraulic actuator arrangement (1) is described comprising a hydraulic actuator having a pressure chamber (2), a cylinder (3) in a cylinder housing (4), and a piston (5) connected to a piston rod, a hydraulic pump (7) connected to the pressure chamber (2) and an electric motor (8) driving the hydraulic pump (7), wherein the pump (7) and the motor (8) are arranged within the actuator. Such an actuator arrangement should have many application possibilities. To this end, a hydraulic pressure amplifier (10) is arranged between the hydraulic pump (7) and the pressure chamber (2).