Vane Pump Recess Portion Segmentation for Torque Reduction
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Solution Overview
Problem
In vane pumps with an annular back pressure groove communicating with all vane grooves and a high-pressure oil introduction system, the hydraulic pressure on the low discharge pressure side is lower than on the high discharge pressure side, leading to increased torque required for rotation and potential oil leakage or torque loss.
Innovation Solution
The vane pump design includes a cam ring with recess portions that supply working fluid to the center space of the vane grooves, with the recess portion divided into sections for first and second discharge pressures, and a rotation angle of the separation portion smaller than the angle between the discharge and suction ports, reducing torque requirements by controlling fluid pressure and flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high discharge pressure oil is introduced to the bottom portion side spaces of all vane grooves via the annular back pressure groove, then the tips of the vanes are pushed against the inner circumferential cam surface, but the torque required to drive rotation is increased due to higher hydraulic pressure on the low discharge pressure side
Solution Approach 1:
The invention segments the vane groove bottom portion side spaces into two groups: those that communicate with the high-pressure chamber via high-pressure oil introduction ports, and those that communicate with the annular back pressure groove. This segmentation allows selective pressurization, where only specific vanes receive high-pressure oil to maintain contact with the cam surface, while others operate at lower pressure, thereby reducing the overall torque required for rotation while ensuring reliable vane-cam contact where needed
Solution Approach 2:
The invention applies local quality by providing different pressure conditions to different portions of the vane groove bottom spaces. Specifically, certain bottom portion side spaces are supplied with high discharge pressure oil through dedicated high-pressure oil introduction ports, while other bottom portion side spaces communicate with the annular back pressure groove. This localized pressurization ensures that vanes in specific regions maintain contact with the cam surface under high pressure, while vanes in other regions operate under lower pressure, optimizing the balance between reliability and torque requirements
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 reduces the torque needed to drive the vane pump by managing fluid pressure and flow effectively, preventing oil leakage and torque loss while maintaining efficient operation.
Implementation Method 1
a center side space which is a space in the vane grooves on a rotation center side, and supplies a working fluid to the center side space
Data Source
AI summary
An inner-plate cam ring side recess portion is formed in a cam ring side end surface of an inner plate, communicates with a columnar groove which is a center side space in a vane grooves, and supplies a working fluid to the columnar groove. The inner-plate cam ring side recess portion is divided into multiple sections between a first side discharge port, through which the working fluid is discharged at a first discharge pressure from a pump chamber, and a second side suction port through which the working fluid is suctioned into a pump chamber discharging the working fluid at a second discharge pressure. An angle of a separation portion in a rotation direction is smaller than or equal to an angle between the first side discharge port and the second side suction port.