Fuel Supply Device Pump Unit Guide Mechanism
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Solution Overview
Problem
The existing fuel supply devices have a limited range of motion for the pump unit due to frictional forces when moved in a torsional direction, leading to insecure attachment to the fuel tank.
Innovation Solution
A fuel supply device with a guide mechanism that allows the pump unit to move smoothly along a plane orthogonal to the connecting shaft, featuring a first guide portion with a recessed portion and a second guide portion with a protruding portion, and a rotation restricting mechanism to prevent the pump unit from rotating orthogonally, ensuring proper movement and secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pump unit is connected to the connecting portion using a connecting shaft that is merely inserted in a connecting hole, then the device complexity is reduced, but the pump unit has a limited range of motion and cannot move smoothly relative to the connecting portion
Solution Approach 1:
The connecting mechanism is segmented into a connecting shaft and a connecting hole, allowing the pump unit to rotate relative to the cover member while maintaining connection. This segmentation enables smooth movement without increasing overall device complexity.
2Ease of operation
If the pump unit is allowed to move freely in a torsional direction, then the ease of operation is improved, but frictional forces prevent smooth movement and cause insecure attachment to the fuel tank
Solution Approach 1:
The connecting shaft acts as an intermediary between the pump unit and the cover member, enabling controlled rotational movement while preventing excessive torsional displacement that would cause friction and insecure attachment.
3Reliability
If the pump unit is restricted to a limited range of motion, then the attachment security is improved, but the ease of operation deteriorates due to frictional forces
Solution Approach 1:
The connecting mechanism provides dynamic movement capability, allowing the pump unit to rotate smoothly within a controlled range during installation and operation, while maintaining secure attachment through the connecting shaft-hole interface.
Data Source
AI summary
A fuel supply device has a cover member which is attached to an opening of a fuel tank, a pump unit provided with a pump, and a connecting portion for connecting the cover member and the pump unit. The fuel supply device has a connecting shaft which is formed on either one of the connecting portion or the pump unit, and a connecting hole which is formed on the other. The fuel supply device has a guide mechanism which can guide the pump unit. The guide mechanism includes a first guide portion formed at the connecting portion and a second guide portion formed at the pump unit. One of the first guide portion or the second guide portion includes a protruding portion which protrudes in a position spaced apart from the connecting shaft. The other guide portion is formed to restrict a movable range of the protruding portion.