Vane Pump Fluid Supply Segmentation
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Solution Overview
Problem
Vane pump devices face limitations in efficiently managing the amount of working fluid supplied to vane grooves, requiring precise pressure control to optimize fluid discharge without excessive fluid usage.
Innovation Solution
A vane pump device design featuring a rotor with vane grooves and a cam ring with distinct pressure regions, utilizing separate supply portions to manage the working fluid pressure, reducing the amount of fluid supplied by targeting specific vane grooves based on their positions, thereby optimizing fluid discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a small amount of working fluid is supplied to vane grooves, then the amount of fluid loss is reduced, but the pressure control precision deteriorates
Solution Approach 1:
The invention divides the cam ring into multiple pressure control regions (first, second, and third regions) with different pressure levels. Each region supplies working fluid to specific vane grooves based on local requirements. This localized pressure control allows precise pressure management while minimizing overall fluid consumption, as only necessary vane grooves receive fluid at each pressure level.
Solution Approach 2:
The cam ring is segmented into distinct pressure control regions that independently manage fluid supply to different vane grooves. The first supply portion, second supply portion, and third supply portion create separate fluid pathways, enabling selective fluid distribution. This segmentation allows the system to supply fluid only where needed, reducing total fluid consumption while maintaining precise pressure control.
2Productivity
If multiple pressure regions are created in the cam ring, then fluid discharge efficiency is improved, but device complexity increases
Solution Approach 1:
The invention integrates multiple pressure control regions and supply portions directly into the cam ring structure, merging the pressure control function with the cam ring's rotational function. This consolidation achieves multi-pressure fluid discharge without requiring separate external pressure control devices, thereby improving fluid discharge efficiency while limiting the increase in device complexity.
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 effectively reduces the amount of working fluid supplied to vane grooves while maintaining efficient fluid discharge, enhancing the pump's operational efficiency and fluid management.
Implementation Method 1
a first supply portion that supplies the working fluid to the vane grooves at the first pressure
Implementation Method 2
a second supply portion that supplies the working fluid to the vane grooves at the second pressure
Implementation Method 3
a cam ring that includes an inner circumferential surface which is provided to face an outer circumferential surface of the rotor and which is provided with a first region that sets a pressure of the working fluid to a first pressure together with the vanes, and a second region that sets the pressure of the working fluid to a second pressure
Data Source
AI summary
An embodiment provides a vane pump device includes multiple vanes; a rotor that rotates and includes vane grooves for supporting the vanes and accommodating oil; a cam ring that includes an inner circumferential cam ring surface provided with a high pressure region and a low pressure region, and that surrounds the rotor; and an inner plate that covers an opening of the cam ring. The inner plate includes a first portion that supplies high pressure oil to the vane grooves, and a second portion that supplies low pressure oil to the vane grooves. Among vane grooves which support vanes positioned in the high pressure region of the cam ring, the first portion supplies high pressure oil to vane grooves, the number of which is less than the number of vanes positioned in the high pressure region.