Variable Displacement Vane Pump With Pressure Regulating Spring Guide
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Solution Overview
Problem
Existing multiple stage variable displacement vane pumps require solenoids for control, making them costly and reliant on electrical input, which is inefficient and less responsive to operating conditions.
Innovation Solution
A multiple stage variable displacement vane pump design that uses a pressure regulating spring guide to control multiple inline springs, allowing for variable displacement without electrical control, achieving multiple stages through the compression of springs by a pivotable slide and cam ring mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a solenoid is used to control multiple stage variable displacement vane pump, then the pump can achieve variable displacement control, but the cost increases and electrical input dependency increases
Solution Approach 1:
The patent replaces the electrical solenoid control system with a purely mechanical control system using a cam ring with variable radius and a roller follower mechanism. The cam ring's varying radius directly translates to different vane stroke lengths, achieving multiple displacement stages without electrical components. This mechanical substitution eliminates the solenoid while maintaining variable displacement functionality.
Solution Approach 2:
The pump system uses its own internal mechanical components (cam ring, roller follower, vanes) to automatically regulate displacement based on operating conditions. The mechanism self-adjusts the cam ring position and vane stroke through mechanical interactions between components, eliminating the need for external electrical control systems.
2Productivity
If a pressure relief valve is used in constant displacement pump, then surplus flow can be redirected, but energy efficiency decreases and response time increases
Solution Approach 1:
The patent implements a dynamic displacement control mechanism where the cam ring can continuously adjust its position and the vanes can dynamically change their stroke length in response to system pressure and flow demands. This dynamic adjustment allows the pump to match output to actual needs, eliminating the energy waste associated with constant displacement pumping and relief valve operation.
Solution Approach 2:
The pump changes the geometric parameter of vane stroke length by varying the cam ring radius and position. This parameter change enables continuous adjustment of displacement volume, allowing the system to optimize energy efficiency by pumping only the required amount rather than relying on relief valves to divert excess flow.
3Device complexity
If single stage pump design is used, then the structure is simpler, but the adaptability to varying operating conditions is reduced
Solution Approach 1:
The patent segments the cam ring into multiple radial sections with different radius values, creating distinct displacement stages within a single pump structure. Each radial section corresponds to a specific vane stroke length, enabling multiple displacement levels without requiring separate pump stages or complex multi-component assemblies.
Solution Approach 2:
The single cam ring structure serves multiple functions: it defines the vane stroke for each chamber, controls the timing of fluid transfer, and provides mechanical guidance for the roller follower. This multi-functional design achieves multiple displacement stages within a unified structure, maintaining simplicity while enhancing adaptability.
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 design eliminates the need for solenoids, providing efficient and responsive control over pump displacement and pressure across varying engine speeds, with two or more stages defined by the compression points of the springs, enhancing energy efficiency and adaptability.
Implementation Method 1
two or more springs positioned inline to each other and in proximity to the pressure regulating spring guide
Implementation Method 2
the working fluid applying a regulating force to the cam ring
Data Source
AI summary
The present invention is a multiple stage variable displacement vane pump comprising a pressure regulating spring guide. A first spring and a second spring may be controlled by said pressure regulating spring guide. The present invention does not require a solenoid or electronic control. Control of flow and speed is achieved through operable of the pressure regulating spring guide that causes the first spring and second spring to be operable in relation to one another, but for the first spring and the second spring to be operable independently of each other. The springs may be positioned to be inline in relation to each other. Rotation of a slide and pressure exerted thereby upon the pressure regulating spring guide may create a first spring regulation stage and a second spring regulation stage.