Electric Fuel Pump Axial Flow Passage Design
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Solution Overview
Problem
Existing electric fuel pumps face challenges in supplying fuel at a high flow rate to engines, particularly in four-wheel motor vehicles, due to limited cross-sectional areas in the fuel passage, which increases pressure drop and reduces motor efficiency.
Innovation Solution
The electric fuel pump design incorporates a fuel passage between the stator's outer periphery and the housing, allowing for a larger cross-sectional area, reducing the gap between the rotor and stator, and enhancing magnetic attraction, thus improving motor efficiency while maintaining high flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cross-sectional area of the fuel passage in the motor portion is increased, then the flow rate of fuel is improved, but the gap between the rotor and stator increases, reducing motor efficiency
Solution Approach 1:
The fuel passage is relocated from the radial direction (between rotor and stator) to the axial direction (between stator and housing). This dimensional change allows the fuel passage to be formed in the axial gap rather than consuming radial clearance, thereby increasing the fuel passage cross-sectional area without affecting the rotor-stator gap and maintaining motor efficiency while improving fuel flow rate
2Use of energy by moving object
If the gap between rotor and stator is reduced to improve motor efficiency, then magnetic attraction is enhanced, but the fuel passage cross-sectional area is limited, reducing flow rate
Solution Approach 1:
The fuel passage is repositioned to utilize the axial space between the stator and housing instead of the radial space between rotor and stator. This allows the rotor-stator gap to be minimized for optimal magnetic attraction and motor efficiency, while the fuel passage cross-sectional area is maximized by using the axial clearance, thereby resolving the contradiction between motor efficiency and fuel flow rate
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 enables the electric fuel pump to supply fuel at a high flow rate without compromising motor efficiency, addressing the limitations of previous designs by optimizing the fuel passage and magnetic interaction.
Implementation Method 1
The motor portion is configured as an inner rotor-type brushless motor and functions as a drive source to drive the pump portion
Implementation Method 2
a permanent magnet 110 that is arranged on the rotor core 109 to form a plurality of magnetic pole portions
Data Source
AI summary
An electric fuel pump is disclosed which includes a pump portion, a motor portion, a housing, and a fuel passage. The pump portion pressurizes fuel. The motor portion drives the pump portion. The motor portion includes a rotor with a rotating shaft and a stator that surrounds an outer periphery of the rotor. The housing surrounds, at least, an outer periphery of the stator of the motor portion. The fuel passage, through which the fuel pressurized by the pump portion passes the motor portion, is made up of a clearance between the outer periphery of the stator of the motor portion and an inner periphery of the housing. The clearance extends, at least, in the axial direction of the rotating shaft of the rotor of the motor portion.