Acceleration Lever Stopper for Intermediate Engine Speed Control
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Solution Overview
Problem
Conventional construction machines require operators to carefully position the acceleration lever at an intermediate-speed position to balance engine output and fuel consumption, which is difficult and time-consuming.
Innovation Solution
A construction machine with a lever mechanism that includes an acceleration lever movable between low-speed, intermediate-speed, and high-speed positions, featuring intermediate- and high-speed stoppers to easily position the lever at the intermediate-speed setting, reducing operator effort and enhancing operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the acceleration lever is manually positioned at an intermediate-speed position to balance engine output and fuel consumption, then fuel consumption is improved, but the ease of operation deteriorates due to the difficulty and time required for careful positioning
Solution Approach 1:
The acceleration lever's movement range is segmented into multiple discrete positions (low-speed, intermediate-speed, high-speed) with stoppers at each position. This segmentation allows the lever to be easily positioned at the intermediate-speed position without requiring careful manual adjustment, thus improving ease of operation while maintaining fuel consumption benefits.
Solution Approach 2:
Stoppers are introduced as intermediary elements between the acceleration lever and the operator. These stoppers automatically position the lever at predetermined speeds, acting as a mediator that eliminates the need for careful manual positioning while achieving the desired intermediate-speed setting for optimal fuel consumption.
2Ease of operation
If the acceleration lever is freely movable to allow easy positioning, then the ease of operation is improved, but the reliability deteriorates due to the risk of accidental movement to high-speed positions
Solution Approach 1:
Stoppers are positioned in advance at specific locations along the acceleration lever's path to prevent accidental movement to high-speed positions. These stoppers create preliminary resistance that counteracts unintended lever movement, thereby improving reliability while maintaining ease of operation through defined positioning points.
Solution Approach 2:
The stoppers provide beforehand cushioning by physically blocking the acceleration lever from moving beyond predetermined positions. This prior cushioning prevents accidental transitions to high-speed positions, ensuring reliable operation while allowing easy positioning at the intended intermediate-speed setting.
Data Source
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AI summary
Provided is a construction machine with an acceleration lever to be easily positioned at an intermediate-speed position. The construction machine includes an acceleration lever (30) movable in front and rear directions of an upper slewing body between a low-speed position and a high-speed position, an engine-speed operation member (39) to change engine speed in accordance with the moving amount of the acceleration lever (30) in front and rear directions, and an intermediate-speed stopper (40) to stop the acceleration lever (30) at an intermediate-speed position between the low-speed and high-speed positions. The intermediate-speed stopper (40) stops the acceleration lever (30) at the intermediate-speed position by restraining the acceleration lever (30) from movement. The intermediate-speed stopper (40) releases the restraint as the acceleration lever (30) moves from the intermediate-speed position to a release position in a direction different from front and rear directions.