Axial Piston Displacement Control via Dual Spool Switching
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Solution Overview
Problem
Existing machines with axial pistons face complications in controlling displacement due to complex hydraulic systems and unsatisfactory automatic switching mechanisms, which complicate architecture and control precision.
Innovation Solution
A device with a control spool system that switches between two positions based on control pressure, using a second switching spool and a spring to adjust the displacement of the machine's inclination, allowing for automatic switching between small and large displacement configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex hydraulic systems with separate units S1 and S2 are used to control displacement, then the machine can achieve variable displacement control, but the device complexity increases and architecture becomes complicated
Solution Approach 1:
The patent merges the previously separate hydraulic control units S1 and S2 into a single integrated control unit. This unified unit combines the displacement control spool and inclination control spool within one structure, reducing the number of separate components while maintaining the ability to control both displacement and inclination independently, thereby resolving the contradiction between adaptability and device complexity
Solution Approach 2:
The integrated control unit performs multiple functions simultaneously - it controls both the displacement of the machine and the inclination of the plate through a single unified structure. The control unit universally manages hydraulic flow distribution for multiple actuators, reducing overall system complexity while maintaining full functional capability
2Extent of automation
If automatic switching mechanisms are implemented to switch between small and large displacement, then the machine can automatically adapt to load conditions, but the control precision becomes insufficient
Solution Approach 1:
The patent implements dynamic control through continuously adjustable spool positions rather than fixed switching positions. The control spools can be positioned at any point along their travel, enabling continuous and precise adjustment of hydraulic flow distribution. This dynamic positioning capability allows for precise control of both displacement and inclination while maintaining automatic adaptation to varying load conditions
Solution Approach 2:
The system incorporates feedback mechanisms where the positions of the control spools are determined by the actual hydraulic pressures and flow conditions in the system. The spools automatically position themselves based on the balance between spring forces and hydraulic forces, creating a self-regulating control system that maintains precision while operating automatically
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 device enables precise control of displacement by automatically adjusting the machine's operation according to load conditions, maintaining efficiency and simplicity in design without modifying the standard architecture.
Implementation Method 1
a spring, wherein: said means of communication comprise a second switching spool, coaxial to the control spool
Implementation Method 2
a control pressure exerts an axial force on the control spool in the direction of the second tool
Implementation Method 3
a switching pressure exerts an axial force on the second spool in the direction of the control spool
Data Source
AI summary
The invention relates to a device (10) for controlling the displacement of a machine (20) with axial pistons comprising a case (23) that houses a control unit comprising a displacement control spool (110) adapted to be switched between two positions by a control pressure (Ps) according to an axis of sliding (Δ): a working position wherein the control spool (110) provides a connection between at least one inlet (103, 104) that receives a supply pressure and an outlet (105, 106) connected to a cylinder for adjusting the inclination of said machine (31a, 31b), and an idle position wherein the control spool (110) interrupts the connection between said inlet (102, 104) and said outlet (101, 103), and comprising means for switching adapted to vary the position of the adjusting cylinder (31a, 31b), a spring (140), characterised in that: said means of communication comprise a second switching spool (130), coaxial to the control spool (110), a switching pressure (Pm) exerts an axial force on the second spool (130) in the direction of the control spool (110), the spring (140) exerts an axial force on the two spools (110, 130), which tends to move them apart from each other, control pressure (Ps) exerts an axial force on the control spool (110) in the direction of the second tool (130).