Throttle Lever Cable Tension Adjustment Mechanism
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Solution Overview
Problem
Existing throttle operating devices for portable work machines with internal combustion engines face difficulties in easily adjusting the tension of the inner cable, making fine adjustments cumbersome due to the need to rotate the throttle lever and access the engine-side end of the outer tube, which is located within a cover and apart from the throttle lever.
Innovation Solution
A throttle operating device with a cable fixing part on the throttle lever that includes a moving mechanism allowing the cable fixing part to be moved along the inner cable's longitudinal direction, enabling easy adjustment of the inner cable tension without requiring rotation of the throttle lever, by using a feed screw mechanism or similar mechanism to change the cable's tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end of the outer tube on the engine side is arranged inside a cover member and apart from the throttle lever, then the throttle cable can be protected and structurally stable, but the adjustment of inner cable tension becomes difficult and workability deteriorates
Solution Approach 1:
The cable fixing part is extracted from the engine-side end of the outer tube and relocated to the throttle lever side. This allows the adjustment mechanism to be accessed at the throttle lever location rather than inside the cover member, significantly improving workability while maintaining structural stability through the secure mounting on the throttle lever
Solution Approach 2:
The inner cable serves as an intermediary element that connects the throttle lever to the valve opening and closing member. By fixing one end to the cable fixing part on the throttle lever and allowing the cable fixing part to move along the inner cable's longitudinal direction, the system enables tension adjustment without exposing the engine-side end
2Ease of operation
If the cable fixing part is moved along the longitudinal direction of the inner cable within the throttle lever, then the inner cable tension can be easily adjusted, but the device complexity increases
Solution Approach 1:
The cable fixing part is designed to be movable along the longitudinal direction of the inner cable within the throttle lever, transitioning from a static fixed position to a dynamic adjustable position. This allows easy tension adjustment by moving the cable fixing part to different positions along the inner cable, and the moving mechanism integrates smoothly with the existing throttle lever structure
Solution Approach 2:
The moving mechanism for the cable fixing part is nested within the throttle lever structure. The cable fixing part moves along the inner cable's longitudinal direction while remaining contained within the throttle lever's internal space, avoiding additional external components and minimizing overall device complexity
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 configuration allows for easier and more precise adjustment of the inner cable tension at the same operational position, improving workability and reducing malfunctions associated with changing the cable's direction within the throttle lever, facilitating access to the adjustment mechanism and enhancing the overall ease of use.
Implementation Method 1
using a feed screw mechanism or similar mechanism to change the cable's tension
Data Source
AI summary
A throttle operating device that adjusts the opening degree of an engine throttle valve is provided. In a throttle operating device according to an aspect of the invention, one end of an inner cable inserted through an outer tube is fixed to a cable fixing part provided in a throttle lever, and the opening degree of the engine throttle valve is adjusted via the inner cable by rotationally operating the throttle lever. The one end of the inner cable is fixed to the cable fixing part with the extending direction of the inner cable changed within the throttle lever. Additionally, a moving mechanism that moves the cable fixing part along a longitudinal direction of the inner cable, is provided in the throttle lever.