Bayonet Filter Housing Locking Mechanism
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Solution Overview
Problem
Existing filter devices face challenges in ensuring secure and reliable connection of the filter housing to other components with minimal effort, particularly in maintaining correct angular positioning and preventing accidental twisting during bayonet connections.
Innovation Solution
The filter device employs a bayonet lock with axial and circumferential form-fitting elements, including a projection for additional locking, and a latching mechanism with a detent spring to provide secure locking with minimal design complexity, indicated by audible, tactile, or visual signals upon engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bayonet lock with form-fitting elements is used to connect the filter housing to another component, then the connection can be made with minimal effort and high operational reliability, but it is difficult to ensure correct angular positioning and prevent accidental twisting
Solution Approach 1:
The bayonet lock mechanism is designed to automatically self-align and self-lock when the filter housing is inserted and rotated. The form-fitting elements guide the rotation and automatically engage at the correct angular position without requiring external alignment tools or complex positioning mechanisms, thereby achieving both ease of operation and connection reliability
Solution Approach 2:
The patent replaces complex mechanical positioning systems with a simplified bayonet lock mechanism that uses elastic deformation of the form-fitting elements to achieve both angular positioning and locking. The elasticity of the elements provides both the guiding function for correct positioning and the locking function for secure connection, eliminating the need for separate positioning and locking mechanisms
2Reliability
If stops are provided to limit twisting movement in the circumferential direction, then accidental twisting beyond the overlapping position is prevented, but the device complexity increases
Solution Approach 1:
The patent merges the stopping function into the existing form-fitting elements by designing them with specific geometric shapes that naturally limit circumferential rotation. The elements themselves serve both as locking mechanisms and as stops, eliminating the need for separate stop components and reducing overall device complexity while maintaining reliability
Solution Approach 2:
The patent changes the geometric parameters of the form-fitting elements, specifically designing them with curved or angled surfaces that provide natural rotation limits. By optimizing the shape and dimensions of these elements, the mechanism inherently prevents over-rotation without requiring additional stopping components, thus maintaining simplicity while ensuring reliability
Data Source
Figure 1~2
Figure 3~4
AI summary
The device has a cup-shaped filter housing connectable with a vehicle flange (4) by a bayonet joint. The joint includes a form closure element on the housing, and another form closure element (7) on the flange. The two elements are brought in an axial form-fit locked position by axial sliding and twisting about a housing longitudinal axis. The elements are brought in a form-fit locked position additionally in a peripheral direction. A locking stage (9) with a projection is brought into the one of the element (7), and another element lies in the locked position in the stage.