Bayonet Coupling Mechanism for Liquid Filter Maintenance
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Solution Overview
Problem
Existing liquid filters, particularly those for internal combustion engines, face issues with mechanical damage to connecting means during operation and require laborious manual separation during maintenance, leading to potential damage to downstream components.
Innovation Solution
The liquid filter design incorporates coupling elements that engage and disengage through rotation, eliminating mechanical bending stresses and allowing for automatic separation, featuring toothing with asymmetrical tooth edges and flexible holding elements to ensure secure operation and simple handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a snap connection is used to connect the closing pin to the filter housing, then the assembly is simple and can be easily connected, but the connecting means tends to become damaged during operation and requires manual separation during maintenance
Solution Approach 1:
The patent transitions from a static snap connection to a dynamic bayonet coupling mechanism that engages and disengages through rotational movement. The coupling elements are designed to rotate relative to each other, allowing the closing pin to move between engaged and disengaged states without manual force, thereby improving reliability while maintaining ease of assembly.
Solution Approach 2:
The bayonet coupling mechanism is designed to automatically engage and disengage through the rotational movement of the closing pin itself, without requiring external manual intervention. The coupling elements self-regulate their connection state based on the position of the closing pin, eliminating the need for manual separation during maintenance.
2Stability of the object's composition
If the closing pin is fixed to the housing, then the seal position is stable during operation, but the closing pin cannot be easily separated from the housing for maintenance
Solution Approach 1:
The patent implements a dynamic coupling mechanism where the closing pin can rotate relative to the filter housing. This rotational movement allows the pin to transition between a stable engaged position (where the seal maintains contact) and a disengaged position (where the pin can be removed), resolving the contradiction between operational stability and maintenance ease.
Solution Approach 2:
The coupling mechanism is segmented into separate coupling elements on the closing pin and corresponding elements on the filter housing. This segmentation allows the pin to be separated from the housing when needed, while maintaining a stable connection during operation through the bayonet engagement.
3Strength
If manual separation of coupling elements is required during maintenance, then the connection is secure during operation, but laborious manual separation is required and parts can move to downstream components causing damage
Solution Approach 1:
The bayonet coupling mechanism performs maintenance functions automatically through the rotational movement of the closing pin. When the pin rotates to the disengaged position, the coupling elements automatically separate without requiring manual intervention, preventing parts from moving to downstream components and eliminating laborious manual separation.
Solution Approach 2:
The bayonet coupling mechanism acts as an intermediary between the closing pin and the filter housing, providing a controlled transition state during separation. The rotational engagement ensures that parts remain contained within the filter assembly during the separation process, preventing them from moving to downstream components.
Data Source
AI summary
A liquid filter having a housing with a removable screw lid and an interchangeable filter unit, the housing having a discharge channel, wherein a closure valve which when installed is fixed to the housing, is axially adjustable between a closed position when the filter unit is installed and the lid is closed, and an open position when the lid is detached and the filter unit is removed, and wherein releasable coupling elements are provided between the lid or filter unit and the valve. The coupling elements engage to transmit torque and tensile forces, by rotation in the loosening direction of the lid, for as long as a seal of the valve which exerts a braking moment on the valve is located in the sealing seat. The coupling elements disengage when the seal has departed from the sealing seat and the valve is thereby freely rotatable about its longitudinal axis.