Fuel Pump Stator Electrode Contact Portion Rust Management
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Solution Overview
Problem
Existing fuel pumps face issues with rust formation at the injection port trace of the stator, which can interfere with the rotation of the rotor, leading to potential mechanical failures and reduced pump efficiency.
Innovation Solution
The fuel pump design includes an electrode contact portion on the outer wall of the stator, which is not electroplated, allowing rust to be removed and discharged through the fuel discharge conduit, thereby preventing its intrusion between the rotor and stator, and maintaining the rotation of the motor and pump arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electroplating is performed on the entire stator surface, then corrosion resistance is improved, but rust removal capability deteriorates
Solution Approach 1:
The stator surface is divided into two regions with different properties: the outer peripheral surface receives electroplating for corrosion resistance, while the electrode contact portion remains unplated to allow rust removal. This local differentiation resolves the contradiction by applying protection only where needed while maintaining self-cleaning capability at the contact zone.
2Ease of manufacture
If the injection port trace is located at the end surface, then manufacturing is simplified, but rotor rotation reliability deteriorates
Solution Approach 1:
The harmful injection port trace is extracted and relocated to the end surface of the stator, separated from the rotor interaction zone. This allows the main cylindrical surface to remain clean and free of rust-prone features, ensuring rotor rotation reliability while maintaining manufacturing simplicity at the relocated trace position.
3Ease of manufacture
If rust is allowed to form and expand at the injection port trace, then material flow during molding is improved, but mechanical interference with rotor occurs
Solution Approach 1:
The unplated electrode contact portion, which could be seen as a manufacturing imperfection, is converted into a beneficial rust removal zone. Rust forms and is subsequently removed by electrode contact at this specific location, preventing accumulation and mechanical interference with the rotor while maintaining the benefits of injection molding.
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 limits rust intrusion, ensuring continuous rotation of the motor and pump arrangements, and prevents mechanical interference, enhancing the fuel pump's operational reliability and efficiency.
Implementation Method 1
An electrode is contactable with the electrode contact portion at a time of performing electroplating on the stator. Since the electroplating is not performed in the electrode contact portion, the rust may possibly be generated there. When the rust, which is formed in the electrode contact portion, is removed from the electrode contact portion, the rust passes through the outer flow passage
Data Source
AI summary
A fuel chamber is formed between a pump arrangement and a motor arrangement, and outer flow passages are formed between a stator of the motor arrangement and a housing. Fuel, which is discharged from a discharge port of the pump arrangement, is outputted to an outside of the housing from a fuel discharge conduit that is formed on a side of the motor arrangement, which is opposite from the pump arrangement, after passing through the motor arrangement. At a time of performing electroplating on the stator, electrode contact portions, to which electrodes can contact, is formed in an outer wall of the stator, which forms the outer flow passages.