Vane Pump Back Pressure Segmentation for Efficiency
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Solution Overview
Problem
Existing vane pumps face inefficiency at high pressure due to increased drive torque caused by strong contact pressure between vanes and the cam ring, limiting the improvement in efficiency even when the subsidiary pump is used to raise discharge pressure.
Innovation Solution
The vane pump design includes a first subsidiary back pressure supply port that communicates with the subsidiary discharge port through an expulsion groove or hole, reducing the pressure applied to the vanes, allowing only centrifugal force to act on them, thereby reducing drive torque and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If back pressure is continuously applied to the vanes through the first back pressure supply channel, then the vanes are pressed strongly against the cam ring improving discharge performance, but the drive torque increases reducing pump efficiency
Solution Approach 1:
The back pressure supply channel is divided into two separate channels: a first back pressure supply channel that supplies back pressure to all vanes, and a second back pressure supply channel that supplies back pressure only to vanes in the discharge range. This segmentation allows selective application of back pressure to different vane groups based on their operational requirements.
Solution Approach 2:
Different back pressure conditions are applied to different locations (vane groups) based on their functional requirements. Vanes in the discharge range receive continuous back pressure for reliable discharge performance, while vanes in the circulation range receive reduced back pressure to minimize drive torque and improve efficiency.
2Power
If the subsidiary pump discharges oil through the spool valve merging with main pump discharge, then discharge pressure is raised, but the vanes on the subsidiary pump side experience strong contact pressure increasing drive torque
Solution Approach 1:
The back pressure supply system is segmented into two independent channels that can be selectively activated. The second back pressure supply channel is specifically configured to supply back pressure only to vanes in the discharge range, allowing the circulation range vanes to operate with minimal back pressure resistance.
Solution Approach 2:
The back pressure application is made dynamic and conditional based on the vane's position and operational state. The second back pressure supply channel activates back pressure only when vanes are in the discharge range, adapting the back pressure condition to the instantaneous operational requirements of each vane group.
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 reduces the drive torque and improves pump efficiency by minimizing the pressure on the vanes, leading to enhanced fuel consumption and discharge performance at high pressures.
Implementation Method 1
only centrifugal force acts on them
Data Source
AI summary
A first main back pressure supply port 55 and a first subsidiary back pressure supply port 56 are formed in a first sliding contact surface 5a of a first side member 5, the first main back pressure supply port 55 is formed in a groove shape in the first sliding contact surface 5a, and the first subsidiary back pressure supply port 56 communicates with the first subsidiary discharge port 54. A second main back pressure supply port 65 and a second subsidiary back pressure supply port 66 are formed in a second side member 6, the second main back pressure supply port 65 passes through the second side member in the axial direction and the second subsidiary back pressure supply port 66 is formed in a groove shape in a second sliding contact surface 6a.