Carburetor Blocking Arrangement Prevents Vibration Choke Engagement
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Solution Overview
Problem
Existing carburetor assemblies in portable handheld work apparatuses often engage the choke unintentionally due to vibration gaps, leading to tolerance issues and improper start positions, which affects the performance of internal combustion engines.
Innovation Solution
A carburetor assembly with a blocking arrangement on the coupling elements between the throttle and choke elements, preventing choke engagement when the throttle is unactuated, and defining start positions through a coupling arrangement, ensuring precise operation and avoiding latching issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a vibration decoupled throttle is mounted on a handle, then the throttle can be operated independently, but tolerance problems arise due to vibration gaps
Solution Approach 1:
A blocking arrangement is introduced as an intermediary mechanism between the throttle element and choke element. This blocking arrangement includes a blocking element that can engage with a blocking contour to prevent unintended choke actuation, thereby mediating the connection between throttle and choke while compensating for vibration gaps and tolerance issues
Solution Approach 2:
The blocking arrangement is designed to automatically engage and disengage based on throttle position. When the throttle is in the closed position, the blocking element automatically engages with the blocking contour to prevent choke actuation. When the throttle is actuated, the blocking element automatically disengages, allowing choke operation without requiring additional control mechanisms
2Adaptability or versatility
If the choke can be actuated independently, then the carburetor has flexible operation modes, but unintended choke engagement occurs due to vibration
Solution Approach 1:
The blocking arrangement applies preliminary anti-action by preventing choke actuation when the throttle is closed. The blocking element is positioned to interfere with choke movement before unintended actuation can occur, thereby counteracting the harmful effect of vibration-induced choke engagement while preserving intentional choke operation when the throttle is actuated
3Reliability
If a blocking arrangement is provided on the coupling element, then choke engagement is prevented when throttle is unactuated, but the configuration becomes more complex
Solution Approach 1:
The blocking arrangement is merged with the existing coupling elements between the throttle and choke. The blocking element is integrated into the coupling mechanism rather than being a separate component, and the blocking contour is formed on existing lever surfaces. This merging approach adds the blocking function while minimizing increases in overall configuration complexity
Data Source
AI summary
A carburetor assembly includes a carburetor (9) wherein a section of an intake channel (10) is configured. A throttle element and a choke element are pivotally journalled in this intake channel (10). A first coupling element is fixedly connected to the throttle element so as to pivot therewith and a second coupling element is fixedly connected to the choke element so as to pivot therewith. The first and second coupling elements form a blocking arrangement which prevents an engagement of the choke element when the throttle element is not actuated.