Elastic Carburetor Coupling for Tolerance Compensation
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Solution Overview
Problem
Existing carburetors require additional space and complexity for axial displacement or tilting of coupling elements to release locking, which complicates the operating sequence and secure locking of throttle and choke elements, especially under manufacturing tolerances.
Innovation Solution
A carburetor design featuring elastic and dimensionally stable coupling elements, where the elastic coupling element is hook-shaped and made of plastic (POM), and the dimensionally stable element is connected to the throttle shaft, ensuring precise locking positions without additional components. The coupling device allows limited mobility to compensate for manufacturing tolerances, ensuring secure closure and easy release of the choke element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional components are added to ensure secure locking and compensate for manufacturing tolerances, then locking reliability is improved, but device complexity increases
Solution Approach 1:
The patent changes the material parameter of the coupling element from rigid to elastic, allowing it to deform under manufacturing tolerances while maintaining secure locking. The elastic deformation capability compensates for tolerance variations without requiring additional adjusting components, thus improving reliability while keeping the structure simple.
Solution Approach 2:
The coupling element is segmented into a hook-shaped section with specific elastic properties and a blocking contour section. This segmentation allows different parts of the same component to fulfill different functions: the hook-shaped section provides elastic deformation for tolerance compensation, while the blocking contour ensures secure locking, eliminating the need for separate components.
2Ease of operation
If axial displacement or tilting movement of coupling elements is allowed to release locking, then ease of operation is improved, but installation space requirement increases
Solution Approach 1:
Instead of allowing axial displacement or tilting movement to release locking as in conventional designs, this patent inverts the approach by using elastic deformation in the planar direction. The coupling element deforms elastically when the choke shaft is rotated, allowing locking release without requiring additional spatial movement, thus maintaining ease of operation while reducing installation space.
Solution Approach 2:
The patent changes the deformation mode from axial displacement/tilting to elastic deformation in the planar direction. This parameter change allows the coupling element to accommodate rotational movement through elastic deformation rather than requiring additional space for axial or angular displacement, resolving the contradiction between ease of operation and space requirement.
3Ease of operation
If the choke element can be easily released without acceleration, then ease of operation is improved, but unintended setting by operator becomes more likely
Solution Approach 1:
The blocking contour is designed to preemptively prevent unintended choke engagement by requiring a specific sequence: the throttle element must be opened first to create sufficient clearance. This preliminary anti-action ensures that the choke can only be engaged after the throttle is opened, preventing accidental locking while maintaining easy release capability through elastic deformation.
Solution Approach 2:
The design requires the preliminary action of opening the throttle element before the choke element can be engaged. This preliminary action creates the necessary spatial clearance for the coupling elements to interact properly, ensuring that choke engagement cannot occur accidentally and must follow the correct operating sequence, while still allowing easy release through elastic deformation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies the structure, reduces space requirements, and ensures a secure and precise operating sequence by allowing the choke element to be securely closed and easily released, even with manufacturing tolerances, without additional securing elements.
Implementation Method 1
at least one of the two coupling elements is at least partially elastic and deforms elastically when the choke shaft is rotated in the opening direction
Implementation Method 2
The coupling element advantageously has a hook-shaped section which is elastic. Due to the hook-shaped design, a high level of elasticity is achieved. The hook-shaped section also forms a favorable contour for latching the two coupling elements.
Data Source
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Figure 10~14
AI summary
The carburetor has a rotary mounted throttle element with a throttle shaft (20) and a rotary mounted choke element with a choke shaft (18), where coupling elements define a start position of throttle element and choke element in a latching position. One of the two coupling elements is formed in partially elastic manner, and the elastic coupling element is elastically deformed during rotation of the choke shaft from the latching position in an opening direction.