Hydraulic Rotor Fluid Displacement for Low-Noise Commutation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydraulic devices experience increased noise and vibration due to pressure differences during the commutation of open ends between high-pressure and low-pressure ports, which are not effectively managed by current fluid displacement members.
Innovation Solution
The hydraulic device incorporates fluid displacement members with first and second openings connected to successive cylinders at opposite sides of a flow resistance, ensuring closure elements are positioned predictably to manage pressure changes, minimizing fluid flow and reducing pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fluid displacement members are used to suppress pressure differences during commutation, then pressure stability is improved, but device complexity increases due to additional components and structures
Solution Approach 1:
The closure element is nested within the fluid displacement member, with the closure element being movable within the fluid displacement member to obstruct openings as needed. This nested configuration allows the closure element to be integrated into the fluid displacement member structure, managing pressure differences without requiring entirely separate components.
Solution Approach 2:
The closure element automatically moves to obstruct openings based on pressure differences between cylinders, without requiring external control mechanisms. The system self-regulates pressure stability through the pressure-driven movement of closure elements, eliminating the need for complex external control systems.
2Stability of the object's composition
If closure elements are freely movable between openings to balance pressure, then pressure differences are reduced, but positioning precision deteriorates making it difficult to ensure closure elements are in predefined positions before open ends reach seal lands
Solution Approach 1:
The closure element is positioned in advance to obstruct the opening before the open end reaches the seal land. By using the flow resistance and pressure differential, the closure element is pushed into the predefined position beforehand, ensuring that when the open end reaches the seal land, the closure element is already in the correct position to prevent pressure differences and associated noise.
Solution Approach 2:
The patent replaces purely mechanical positioning systems with a pressure-driven system. Instead of using mechanical springs or actuators to position closure elements, the system uses pressure differences created by flow resistance to automatically position closure elements in predefined locations, improving positioning precision without complex mechanical mechanisms.
3Productivity
If open ends travel between high-pressure and low-pressure ports, then hydraulic fluid flow is enabled, but noise and vibration increase due to pressure differences during commutation
Solution Approach 1:
The closure element acts as an intermediary between the high-pressure and low-pressure ports during commutation. As the open end travels between ports, the closure element gradually obstructs openings to manage pressure transitions, preventing sudden pressure differences that would cause noise and vibration while maintaining continuous hydraulic fluid flow.
Solution Approach 2:
The flow resistance and closure element system provides beforehand cushioning by gradually managing pressure transitions during commutation. Before the open end fully transitions between ports, the closure element begins to obstruct openings, cushioning the pressure change and preventing sudden pressure differences that would generate noise and vibration.
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 stabilizes pressure changes at seal lands, preventing noise and vibration by ensuring closure elements are in predefined positions before open ends reach seal lands, thus maintaining consistent pressure levels.
Implementation Method 1
If under operating conditions the pressure in the cylinder that communicates with the second opening is higher or lower than the pressure in the cylinder that communicates with the first opening, the closure element can move to the first opening or the second opening and substantially obstruct the first opening or the second opening
Implementation Method 2
the first opening and the second opening of each two fluid displacement members which communicate with one cylinder are fluidly connected with that cylinder at opposite sides of the flow resistance
Data Source
AI summary
A hydraulic device comprises an outer surface of a rotor rotating and facing an outer surface of a port member. The rotor has a plurality of cylinders disposed about an axis and cooperating pistons. The cylinders communicate with respective open ends at the rotor outer surface. Each open end alternatingly communicates with high and low pressure ports. Each two successive cylinders are interconnected via a fluid displacement member having first and second openings communicating with each respective cylinder and a closure element that obstructs either the first or second opening if the pressure in the cylinder that communicates with the second opening is higher or lower than the pressure in the cylinder that communicates with the first opening, respectively. The first opening and the second opening of each two fluid displacement members which communicate with one cylinder are fluidly connected with that cylinder at opposite sides of a flow resistance.