Fuel Supply Connecting Shaft Guide Mechanism
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Solution Overview
Problem
Existing fuel supply devices for internal combustion engines risk disconnection of the connecting shaft from the connecting hole during assembly due to deformation of the stopper piece, leading to a loss of connection between the base and the connecting portion.
Innovation Solution
A fuel supply device design featuring a connecting shaft with a bulge portion and a stopper piece, where a guide mechanism positions the stopper piece between the bulge portion and the base when force is applied, preventing disengagement of the connecting shaft from the connecting hole, and maintaining the connection between the base and the connecting portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stopper piece is made elastically deformable to enable assembly, then the ease of manufacture is improved, but the reliability of the connection deteriorates due to possible disconnection
Solution Approach 1:
The guide mechanism performs a preliminary action by positioning the stopper piece in a safe location between the bulge portion and base portion before any excessive force can cause disconnection. This preventive positioning ensures that even when force is applied during assembly, the stopper piece cannot be pushed out to cause disconnection of the connecting shaft from the connecting hole
Solution Approach 2:
The guide mechanism acts as an intermediary element that mediates between the stopper piece and the excessive assembly force. It guides the stopper piece to move to a protected position, preventing the direct transmission of force that would push the stopper piece out and cause disconnection, thus maintaining connection reliability during the assembly process
2Ease of operation
If the connecting shaft is made deformable to allow passage through the connecting hole, then the ease of operation is improved, but the reliability deteriorates due to risk of disconnection
Solution Approach 1:
The guide mechanism performs a preliminary protective action by positioning the stopper piece in a safe location before excessive force can cause the connecting shaft to disengage. This ensures that the deformable connecting shaft can be easily assembled while the guide mechanism preemptively prevents any potential disconnection by securing the stopper piece in place
3Reliability
If the stopper piece is positioned to prevent disconnection, then the reliability is improved, but the device complexity increases due to the guide mechanism
Solution Approach 1:
The guide mechanism merges the functions of guiding and protecting into a single integrated structure. By combining the guidance function with the connection structure, the patent achieves reliable positioning of the stopper piece without adding significant complexity, as the guide mechanism serves multiple purposes within the existing assembly framework
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 prevents unexpected separation of the base and connecting portion, ensuring stable assembly and operation of the fuel supply device, even under excessive force conditions.
Implementation Method 1
a guide mechanism being provided for guiding at least one part of the connecting shaft or the stopper piece to move so that at least one part of the stopper piece is positioned between the bulge portion and the base portion when a predetermined amount of force is applied to the connecting shaft
Implementation Method 2
The stopper piece is configured to limit a movable range of the shaft portion towards the insertion region when the shaft portion is located within the engagement region
Implementation Method 3
The connecting hole includes an engagement region where the shaft portion is allowed to pass through while the bulge portion is not
Data Source
AI summary
A fuel supply device includes a cover, a base including a base main body, and a connecting portion configured to connect the cover and the base. The base main body and the connecting portion are connected by a connecting shaft comprising a shaft portion and a bulge portion, a connecting hole formed so as to continuously extend an engagement region and an insertion region, and a stopper piece capable of limiting a movable range of the shaft portion located within the engagement region towards the insertion region. A guide mechanism is provided for guiding the connecting shaft to move so that at least one part of the stopper piece is positioned between the bulge portion and the base portion when a predetermined amount of force is applied to the connecting shaft.