Hydraulic Intensifier with Concentric Pistons for Force Multiplication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing linear actuators with force multipliers cannot repeatedly reset without losing the reached position or thrust force, leading to reduced performance during restarts.
Innovation Solution
A double-acting concentric piston design within a cylinder, with a hydraulic circuit and proportional servo-control, allows for force multiplication and independent reciprocal movement, maintaining position and thrust force across cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional intensifier of hydraulic power is used, then force multiplication is achieved, but the thrust force decreases during reset phase and may eventually reach zero
Solution Approach 1:
The intensifier is divided into two independent concentric cylinders: an outer cylinder containing a first piston and an inner cylinder containing a second piston. This segmentation allows independent operation of each piston, enabling the second piston to maintain thrust force while the first piston resets, thereby resolving the contradiction between force multiplication and thrust force maintenance during reset phase.
Solution Approach 2:
The inner cylinder with the second piston is nested within the outer cylinder containing the first piston. This nested configuration allows both pistons to operate simultaneously in the same space, enabling continuous force multiplication while one piston resets and the other maintains thrust, thus preventing thrust force degradation during reset.
2Force
If a force multiplier is added inside the cylinder stem, then force multiplication capability is improved, but the device complexity increases
Solution Approach 1:
The outer cylinder serves dual functions as both the housing for the first piston and the sliding seat for the second piston. The inner cylinder serves as both the housing for the second piston and the stem extension. This multi-functionality reduces the number of separate components needed, thereby limiting the increase in device complexity while achieving force multiplication.
Solution Approach 2:
The functions of the cylinder stem and the force multiplier housing are merged into a single integrated structure. The inner cylinder combines the stem extension function with the force multiplier housing, reducing the overall number of parts and simplifying the device structure while maintaining force multiplication capability.
3Adaptability or versatility
If the same outer dimensions are maintained, then the adaptability for different applications is improved, but the functional characteristics become more difficult to differentiate
Solution Approach 1:
The intensifier employs a dynamic control system with proportional valves and servo-control that can independently regulate the operation of the first and second pistons. This dynamic control allows the same physical structure to adapt to different functional requirements by adjusting control parameters, enabling differentiation of functional characteristics while maintaining identical outer dimensions.
Solution Approach 2:
The system allows independent adjustment of control parameters for each piston, including pressure, flow rate, and positioning. By changing these parameters, the same device can be optimized for different applications (pressing, cutting, driving kinematic mechanisms) without modifying the physical structure, thus maintaining adaptability while managing functional configuration complexity.
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 repeated force multiplication and position maintenance without loss of thrust force, suitable for various industrial applications including pressing, cutting, and kinematic mechanism driving, with customizable control and power circuits.
Implementation Method 1
an hydraulic circuit, wherein the whole is characterised in that the said fixed part has the double function of liner for the piston and slide for the mobile part homologous to the stem
Implementation Method 2
the said piston can be moved reciprocally by the said hydraulic circuit formed by suitable valves and relative distributor
Implementation Method 3
which can move reciprocally and which permits the multiplication of the force by feedback positioning through a pure proportional servo-control
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a linear hydraulic actuator which incorporates inside it a piston which can be reciprocally actuated by means of a distributor and a feedback positioning and reversing device. If during its uniform linear travel the actuator meets a resistance or an obstacle, actuating the double- action piston reciprocally will enable the actuator to continue its stroke with intermittent motion and multiplied force without the mobile part of the actuator moving back from the previously reached position and until the obstacle has been overcome.