Hydraulic Distributor Axial Bore Spring Return Mechanism
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Solution Overview
Problem
In hydraulic machines, the assembly and operation of the internal distributor and cylinder selector are complex, leading to potential deformation, wear, and seizure issues due to unbalanced hydraulic pressing and interfering thrusts, which complicates the balancing of fluid flow connections between the distributor and cylinder block.
Innovation Solution
The control chamber is positioned at one end of the axial bore and closed by an end wall, with a return spring in a separate return chamber at the opposite end, allowing the distributor to be assembled and manipulated as a unit, internalizing forces and preventing them from affecting the interface with the cylinder block, thus simplifying assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the control chamber is defined by a radial wall portion of the distributor, then the fluid pressure increase can contribute to moving the distributor towards the cylinder block, but this generates an interfering thrust that is detrimental to balancing the hydraulic pressing
Solution Approach 1:
The distributor is segmented into separate functional zones: a control chamber at one end of the axial bore and a return chamber with a return spring at the other end. This segmentation isolates the control chamber's hydraulic pressing force from generating interfering thrusts on the distributor-cylinder block interface, allowing independent optimization of each function.
Solution Approach 2:
The return spring and return chamber are extracted as a separate mechanism from the control chamber. The return spring is disposed in the return chamber closed by a second end wall of the distributor, removing the spring force from the control chamber's pressure zone and preventing interference between these two force systems.
2Ease of manufacture
If the distributor and cylinder selector are assembled together during hydraulic machine assembly, then the machine can be assembled as a unit, but adjustments are relatively complex and depend on how the distributor and cylinder capacity selector are assembled
Solution Approach 1:
The distributor is designed as a modular unit with the axial bore, control chamber, and return chamber clearly defined. The slide moves within the axial bore between the control chamber and return chamber, creating distinct functional segments that simplify assembly and adjustment procedures.
Solution Approach 2:
The axial bore acts as an intermediary space that connects the control chamber and return chamber while housing the slide. This intermediate structure provides a defined path for the slide and a controlled environment for the return spring, simplifying the assembly relationship between components.
3Quantity of substance
If the fluid pressure from distribution ducts is exerted on uninterrupted portions of the communication face, then fluid-flow connection is established, but this tends to move the distributor away from the cylinder block
Solution Approach 1:
The control chamber is positioned to receive fluid pressure that generates a counteracting force against the moving-away effect. The control chamber's hydraulic pressing force opposes the tendency of the distributor to move away from the cylinder block, balancing the forces at the distributor-cylinder block interface.
Solution Approach 2:
The control chamber is extracted as a separate force-generating zone from the distribution ducts. By defining the control chamber at one end of the axial bore closed by a first end wall, the patent separates the force balance function from the fluid distribution function, allowing independent control of hydraulic pressing.
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
This configuration simplifies the assembly and operation of the hydraulic machine by internalizing forces, reducing the risk of deformation and wear, and ensuring balanced hydraulic pressing, enhancing the structural integrity and reliability of the distributor and cylinder block interface.
Implementation Method 1
at least one return spring exerting an opposing force that opposes such movement
Implementation Method 2
the control chamber suitable for being fed with fluid to cause the slide to be moved
Implementation Method 3
the distribution face must be pressed against the communication face
Data Source
AI summary
The device has an internal distributor to be disposed in a casing portion (10A), and has a body (15) that has an outside axial face (15B) provided with two grooves (17, 19) respectively for feed and for discharge. The distributor has distribution ducts (23A, 23B, 23C) that open out in a distribution radial face and a cylinder capacity selector that has a slide (50) suitable for being moved in an axial bore (53) for connecting the distribution ducts to one or the other of the grooves. The device further has a control chamber (52) provided between a first end wall (15′) of the bore and the first end (50A) of the slide, and an opposing spring (55) disposed in a return chamber (52′) situated at the second end (53″) of the bore and closed, at the end closer to the distribution face (15A), by a second end wall (55′) of the distributor.