Fuel Pump Module Vibration Isolation Bracket
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Solution Overview
Problem
Conventional fuel pump modules experience noise issues due to vibration transmission from pumps to the fuel tank, which is amplified through the cover member and subtank, affecting engine performance and fuel mileage.
Innovation Solution
A fuel pump module design incorporating two pumps, two filters, and an elastic member to reduce vibration transmission, where one pump is housed in a support part within a housing member, and a regulating member engages with the housing to control movement, utilizing an elastic member to dampen vibrations between the pump and the regulating member, thereby reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two pumps are mounted on a cover member that closes the fuel tank, then fuel supply capability is improved, but vibration is transmitted to the fuel tank causing noise
Solution Approach 1:
A vibration isolation member (elastic material) is introduced as an intermediary between the pumps and the cover member. This mediator absorbs and dampens vibrations from the pumps, preventing them from being transmitted to the cover member and fuel tank, thereby reducing noise while maintaining the dual-pump configuration for improved fuel supply capability
Solution Approach 2:
The physical state of the connection between pumps and cover member is changed from rigid to elastic by using a vibration isolation member made of elastic material. This parameter change allows the system to maintain structural integrity while absorbing vibrations, resolving the contradiction between maintaining pump stability and reducing vibration transmission
2Device complexity
If pumps are directly supported on the cover member, then structural simplicity is maintained, but vibration transmission to the fuel tank is amplified
Solution Approach 1:
The vibration isolation member serves as a mediator between the pumps and the cover member, adding minimal structural complexity while effectively blocking vibration transmission. The elastic material absorbs vibrations without requiring complex isolation mechanisms, maintaining relative structural simplicity while solving the vibration problem
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
The solution effectively reduces noise generated by vibration transmission to the fuel tank, enhancing engine performance and fuel efficiency by minimizing the transmission of pump-induced vibrations.
Implementation Method 1
vibration caused by an operation of the pump is transmitted to the fuel tank through the housing member and the regulating member
Implementation Method 2
an elastic member made of an elastic material, abutting the regulating member and interposed between (i) the first pump and the regulating member or (ii) the second pump and the regulating member
Data Source
AI summary
A noise from a fuel pump module is reduced by housing a port injection (PI) fuel pump in a pump case of a fuel tank, in a structure in which the PI fuel pump is held with a bracket that is provided at a position between the PI fuel pump and a PI suction filter. The PI fuel pump and the bracket that engages with the pump case are interposed by an elastic member that abuts a base part of the bracket. In operation, when the PI fuel pump transmits its vibration to the pump case through the elastic member and the bracket, the elastic member dampens and reduces the vibration transmitted to the bracket, thereby reducing the noise by a reduction of transmitted vibration through the pump case to a subtank and the fuel tank.