Hydraulic Pump Control Piston for Load-Dependent Power Regulation
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Solution Overview
Problem
Existing control devices for hydraulic variable displacement pumps are complex, requiring a large number of components and additional pressure control valves, making them inefficient and difficult to adjust, especially in achieving load-dependent power regulation without external control intervention.
Innovation Solution
A simplified control device using a control piston preloaded by springs and an actuator to manage the displacement volume of the pump, allowing for automatic load-dependent output level setting without additional pressure control valves, enabling flexible adjustment of flow rates and power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional control device with multiple components and pressure control valves is used, then the pump can achieve load-dependent power regulation, but the device complexity increases and requires additional pressure control valves
Solution Approach 1:
The patent combines the pressure control valve functionality directly into the control piston assembly. The control piston (6) integrates multiple control edges (38, 39) that perform both flow control and pressure regulation functions, eliminating the need for separate pressure control valves. This merging of functions reduces the overall number of components while maintaining the load-dependent power regulation capability.
Solution Approach 2:
The control piston (6) serves multiple functions simultaneously: it controls the flow to the servo cylinder, regulates the pressure, and responds to load conditions. The single control piston assembly performs what traditionally required multiple specialized components, achieving multi-functionality that reduces system complexity while maintaining regulatory capability.
2Adaptability or versatility
If a control device with multiple springs and solenoids is used, then the pump can be adjusted, but the ease of operation decreases due to complex structure
Solution Approach 1:
The control device is segmented into functional zones on the control piston: a first control edge (38) for one function and a second control edge (39) for another function. This segmentation allows independent adjustment of different parameters through a single unified component, maintaining adaptability while simplifying operation compared to multiple separate adjustment mechanisms.
Solution Approach 2:
The control piston (6) is designed to shift dynamically in response to load conditions, with its position automatically adjusting based on the balance between spring forces and hydraulic pressures. This dynamic response eliminates the need for complex manual adjustment mechanisms, improving ease of operation while maintaining adaptability to varying load conditions.
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 provides a robust, easily adjustable control device that effectively manages flow rates and power levels in hydraulic variable displacement pumps, ensuring reliable operation with reduced components and no need for external control intervention, enhancing flexibility and efficiency.
Implementation Method 1
the control piston of the control unit at a first end adjacent to the inlet is preloaded by a first spring and subject to high pressure from pressure fluid supplied by a variable displacement pump
Implementation Method 2
subject to high pressure from pressure fluid supplied by a variable displacement pump to create a hydraulic force such that the control piston can shift
Implementation Method 3
At the second end of the control piston, a second spring engages which counteracts the hydraulic force and the preload of the first spring
Implementation Method 4
an actuator is placed at one of the two ends of the control piston which can be controlled by a control unit, the actuator serving to transfer a tractive or compressive force to the end of the control piston
Implementation Method 5
a servo piston that can shift inside a servo cylinder, to which, in turn, pressure can be applied via a control device by means of pressurized pressure fluid
Data Source
AI summary
Control device for hydraulic variable displacement pumps operated in an open hydraulic circuit and adjustable in their displacement volume by means of a servo control device. The control device comprises a control piston with two control edges to which pressure can be applied by means of pressurized pressure fluid from a variable displacement pump, the control piston being mounted in a housing so that it shifts longitudinally. The housing of the control piston comprises an inlet for the connection of a high pressure line of a variable displacement pump, an outlet which can be connected to a tank and a servo connection which can be linked to a servo cylinder, whereby a link between the inlet and the servo connection can be made via a first control edge. It is possible to create a link between the servo connection and the outlet via a second control edge.