Carburetor Choke Mechanism Nested Connection Lever
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Solution Overview
Problem
Conventional automatic choke mechanisms for carburetors are bulky and slow due to a large actuator stroke, leading to increased fuel consumption and inefficient engine warm-up.
Innovation Solution
A compact carburetor choke mechanism with a straight-acting actuator, a connection lever, and a choke lever with a bottomed cylindrical shape, where the connection mechanism is integrated within the cylindrical outer periphery, allowing for a shorter arm length and faster valve operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lever arm is located on the outer side of the bottomed cylindrical part, then the choke lever can be mounted in an integrated form, but the radius of rotation (arm length) becomes large, requiring a larger actuator stroke and enlarging the overall mechanism
Solution Approach 1:
The connection mechanism is nested within the bottomed cylindrical part of the choke lever. The connection lever is positioned inside the cylindrical hollow space, allowing the connection mechanism to be contained within the choke lever's structure rather than extending outward, thus reducing the overall radius of rotation while maintaining integrated mounting
2Ease of operation
If the radius of rotation (arm length) is large, then the choke lever can be mounted in an integrated form, but the actuator stroke must be enlarged, making the mechanism bulky
Solution Approach 1:
The connection lever and its connection mechanism are nested within the hollow cylindrical space of the choke lever. This internal positioning allows the connection mechanism to operate with a reduced radius of rotation, thereby reducing the required actuator stroke while maintaining the integrated mounting advantage
3Ease of manufacture
If the actuator stroke is large, then the choke lever can be mounted in an integrated form, but the structure of the whole choke mechanism must be enlarged
Solution Approach 1:
The connection mechanism is nested within the bottomed cylindrical part of the choke lever, with the connection lever positioned inside the cylindrical hollow space. This containment approach allows the integrated mounting structure to maintain a compact overall length by eliminating the need for external extension of the connection mechanism
4Ease of operation
If the actuator stroke is large, then the choke lever can be mounted in an integrated form, but it takes time to open the choke valve, deteriorating fuel consumption
Solution Approach 1:
The connection lever is nested within the hollow cylindrical space of the choke lever, creating a compact connection mechanism with a reduced radius of rotation. This reduction in rotational radius directly decreases the actuator stroke required, enabling faster choke valve opening and closing operations, thereby reducing the time loss and improving fuel consumption
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
The compact design enables quicker and more efficient control of the choke valve, improving engine start-up and reducing fuel consumption.
Implementation Method 1
an actuator (13) which expands and contracts in a straight manner based on a temperature change
Data Source
AI summary
A carburetor choke mechanism including an actuator linearly expanded and contracted based on a temperature change; a connection lever which is connected to a rotation axis at one end, and rotates based on receiving a thrust of the actuator; a choke lever which is connected with the other end of the connection lever, and receives a rotary force; and a valve shaft where a choke valve is fixed to one end thereof, and a valve shaft lever which receives a transfer of a rotary force from the choke lever is provided on the other end thereof, wherein the choke lever has a bottomed cylindrical shape covering an outer circumference of the valve shaft lever, and the valve shaft lever penetrates a bottom thereof, and is provided rotatably, and a connection mechanism between the connection lever and the choke lever is provided inside a cylindrical outer periphery of the choke lever.