Fuel Pump Module Axial Constraint Vibration Reduction
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Solution Overview
Problem
Conventional fuel pump modules experience vibration and noise issues due to the transmission of rotational movement from the pump part to the pump case and fuel tank, leading to increased noise levels.
Innovation Solution
A fuel pump module design featuring a holding member with a convex part that rotates around a central axis, allowing for reduced vibration transmission by creating a clearance between the convex and concave parts in a radial direction, thereby restricting movement in the axis direction and minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pump part is rigidly connected to the pump case via the bracket, then the structural stability is improved, but the vibration and noise increase due to transmission of rotational movement
Solution Approach 1:
The connection between the pump part and pump case is segmented into two independent connection paths: one for radial direction (through the holding member with clearance) and one for axial direction (through the convex-concave part engagement). This segmentation allows different mechanical properties in different directions, achieving both stability and vibration reduction.
Solution Approach 2:
The holding member is designed with asymmetric local qualities: it provides rigid constraint in the axial direction through the convex-concave engagement, while maintaining clearance in the radial direction to allow vibration isolation. This local differentiation of mechanical properties resolves the contradiction between stability and noise reduction.
2Object-generated harmful factors
If the pump part is allowed to rotate freely, then the vibration transmission is reduced, but the movement control in axial direction becomes insufficient
Solution Approach 1:
The connection system transitions from a static rigid connection to a dynamic semi-rigid connection that adapts to different motion requirements. The clearance in the holding member allows radial rotation and vibration absorption, while the convex-concave engagement maintains axial position control, creating a dynamically adaptive connection.
3Manufacturing precision
If a rigid bracket connection is used, then the manufacturing precision is improved, but the noise level increases due to vibration transmission
Solution Approach 1:
The holding member acts as an intermediary element between the pump part and pump case. It mediates the connection by providing precise axial positioning through the convex-concave engagement while introducing radial clearance to break the vibration transmission path, thus reducing noise without sacrificing connection precision.
Data Source
AI summary
A fuel pump module includes a suction filter, a fuel pump portion having an end part opposing the suction filter, and a holding member allowing the fuel pump portion to rotate around a central axis of the fuel pump portion and restricting the fuel pump portion from moving in an axis direction. A convex part protruding toward the suction filter is defined at the end part of the fuel pump portion. The holding member is positioned between the fuel pump portion and the suction filter and has a concave part, in which the convex part is inserted, such that a clearance is defined between the convex part and the concave part in a radial direction. The convex part has a tip end capable to be in contact with the concave part in the axis direction.