Vane Pump Back Pressure Groove Dimensionality Change
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Solution Overview
Problem
Vane pumps with small back pressure grooves divided in the circumferential direction struggle to supply a sufficient amount of discharged oil to the center side spaces of the vane grooves, leading to inefficiencies in oil distribution and potential issues like torque loss and oil leakage.
Innovation Solution
The vane pump design includes specific recess portions and through-holes in the inner and outer plates that separate the high and low pressure oil passages, preventing communication between them via the vane grooves, ensuring accurate oil supply to the center side spaces and maintaining optimal contact pressure between the vanes and the cam ring surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the back pressure groove is divided into multiple sections in the circumferential direction to reduce volume, then the device complexity is reduced, but the quantity of discharged oil supplied to the center side spaces becomes insufficient
Solution Approach 1:
The patent transitions from a two-dimensional planar groove system to a three-dimensional multi-level structure by adding recess portions at different axial positions (first recess portion at one end, second recess portion at the other end) and connecting them via a third recess portion. This vertical dimensionality allows the back pressure groove to maintain sufficient oil supply capacity while occupying less circumferential space, effectively resolving the contradiction between reduced volume and maintained quantity of substance.
2Volume of stationary object
If the back pressure groove volume is reduced, then the device complexity is reduced, but torque loss and oil leakage occur due to insufficient oil supply to center side spaces
Solution Approach 1:
The back pressure groove is segmented into multiple independent recess portions (first recess portion, second recess portion, and third recess portion) positioned at different locations. Each segment independently supplies oil to specific center side spaces, ensuring reliable oil distribution even with reduced overall volume. This segmentation prevents torque loss and oil leakage by maintaining adequate oil supply to all necessary areas.
3Quantity of substance
If a single large back pressure groove is used to supply sufficient discharged oil, then the quantity of substance is adequate, but the device complexity increases
Solution Approach 1:
Instead of expanding the back pressure groove circumferentially (which increases device complexity), the patent utilizes the axial dimension by creating recess portions at both ends of the cam ring and connecting them through the thickness direction. This three-dimensional configuration maintains sufficient oil supply capacity while keeping the circumferential footprint compact, thereby reducing overall 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 enhances the vane pump's ability to accurately supply working fluid to the center side spaces, preventing torque loss and oil leakage, while maintaining efficient oil distribution and pressure balance between the high and low pressure sides.
Implementation Method 1
high discharge pressure oil discharged from the discharge port is supplied to the annular back pressure groove of the outer plate via the high-pressure oil introduction ports of the inner plate and then the bottom portion side spaces of a portion of the vane grooves of the rotor... the tips of vanes are pushed against and brought into contact with an inner circumferential cam surface of a cam ring by the pressure of the high discharge pressure oil introduced to the bottom portion side spaces of the vane grooves
Data Source
AI summary
An embodiment provides an inner plate including a high pressure side discharge through-hole through which a working fluid is discharged from a pump chamber; an inner-plate high pressure side through-hole through which the working fluid is guided to a columnar groove of a vane groove; and an inner-plate high pressure side recess portion that is a groove facing a columnar groove among multiple columnar grooves. An outer plate includes a high pressure side upstream recess portion; a high pressure side downstream recess portion; and a high pressure side connection recess portion through which the high pressure side upstream recess portion and the high pressure side downstream recess portion are connected to each other, and which has a passage area smaller than that of the high pressure side downstream recess portion.