Carburetor Partition Wall for Compact Two-Stroke Engine
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Solution Overview
Problem
Existing carburetors for two-stroke engines used in hand-guided devices are bulky and heavy, affecting ergonomic working and maintaining consistent running behavior, especially during device pivoting.
Innovation Solution
A carburetor design with a partition wall section that separates the intake channel into a mixture channel and an air channel, allowing the throttle and choke flaps to overlap, reducing the carburetor's length and weight while maintaining efficient airflow and mixture composition by optimizing the flow cross-sections and positioning of the flaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the carburetor is designed with separate air channel and mixture channel sections, then the running behavior is improved, but the carburetor size and weight increase
Solution Approach 1:
The air channel section and mixture channel section are merged into a single carburetor body with integrated housing, allowing both channels to coexist in a compact arrangement that reduces overall size and weight while maintaining functional separation through internal partitioning
Solution Approach 2:
The carburetor body is segmented into distinct air channel and mixture channel sections with defined separation zones, allowing independent optimization of each channel's flow path while maintaining compact overall dimensions through strategic positioning of separation elements
2Ease of operation
If the carburetor length is reduced for ergonomic working, then the ease of operation is improved, but the airflow quantity may be insufficient
Solution Approach 1:
The carburetor design utilizes three-dimensional spatial arrangement of channels and components rather than simple linear extension, allowing sufficient flow cross-sectional area to be achieved within a compact length by optimizing vertical and lateral dimensions of the air and mixture channels
Solution Approach 2:
The flow cross-sections of the air channel and mixture channel are locally optimized in different regions of the carburetor, with enlarged cross-sections positioned where space is available and tapered sections where space is constrained, maintaining sufficient total airflow while reducing overall carburetor length
Data Source
AI summary
A carburetor has a carburetor body wherein an intake channel is formed. A throttle flap is pivotably mounted by a throttle shaft in the carburetor body for controlling the free flow cross-section of the intake channel. The intake channel has a first longitudinal center axis in the region of the throttle shaft. The throttle flap has first and second end positions, wherein the throttle flap opens a larger flow cross-section of the intake channel in the second end position than in the first end position. A partition wall section, on which the throttle flap lies in the second end position, is arranged upstream of the throttle shaft. A choke flap is upstream of the partition wall section and is pivotable between first and second end positions. In their second end positions, the throttle flap and the choke flap overlap in the direction of the first longitudinal center axis.