Engine Stopping Device Pin Slot Coupling Misalignment
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Solution Overview
Problem
Conventional engine stopping devices face instability due to dimension and assembly errors, leading to misalignment between the extending-retracting rod and operation arm, which can prevent the operation arm from reaching the stopping position or returning to the waiting position, resulting in unstable operation.
Innovation Solution
The engine stopping device employs a fitting engagement between a pin and a cut-out portion on the extending-retracting rod and operation arm, where the cut-out portion is elongated along a direction intersecting the movement trajectory, allowing for relative movement and absorption of misalignment, ensuring smooth operation even with errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pin coupling configuration is used to pivotably couple the extending-retracting rod and operation arm, then the structure is simple, but dimension errors and assembly errors cause misalignment that prevents stable operation
Solution Approach 1:
The coupling structure transitions from a fixed rigid connection to a dynamic adjustable connection. The operation arm is designed with a slot that can accommodate different positions of the pin, allowing the system to adapt dynamically to dimensional variations and assembly tolerances, ensuring reliable operation despite manufacturing imperfections
Solution Approach 2:
The geometric parameters of the coupling interface are made variable through the slot design. Instead of a fixed pin position, the slot allows the effective coupling point to shift along its length, changing the geometric parameters to compensate for dimensional errors and maintain proper alignment between the extending-retracting rod and operation arm
2Device complexity
If the stopping solenoid is provided at a fixed position with constant stroke, then the structure is simplified, but assembly errors and dimension errors cause unstable operation
Solution Approach 1:
The system introduces dynamic adjustability at the coupling interface to compensate for the fixed solenoid position. The slot in the operation arm allows the pin position to vary, creating a dynamic compensation mechanism that absorbs dimensional and assembly errors without requiring the solenoid itself to be adjustable
Solution Approach 2:
The slot-pin coupling acts as an intermediary element between the fixed solenoid and the operation arm. This intermediary absorbs the mismatch caused by dimensional and assembly errors, allowing the fixed solenoid to reliably drive the operation arm despite manufacturing imperfections
Data Source
AI summary
There is provided an engine stopping device including a stopping solenoid, where an operating shaft, interlocked to a control rack of a fuel injection pump, is rotatably supported by an engine case in a pass-through manner. The control rack is forcibly movable to a stopping position by an action of the stopping solenoid on an operation arm provided for a projecting portion of the operating shaft in an integrally rotatable manner. An extending-retracting rod of the stopping solenoid and the operation arm are interlocked by fitting engagement between a pin provided for the extending-retracting rod and a cut-out portion of the operation arm. The cut-out portion is configured in a shape elongated along a direction perpendicular to a movement trajectory of the extending-retracting rod.