Wheel Loader Cab Console Layout for Reduced Lever Switching Fatigue
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Solution Overview
Problem
Operators of wheel loaders experience fatigue when switching between controlling the arm and bucket levers, as they need to release one lever and grasp the other, leading to repetitive strain and discomfort.
Innovation Solution
The design includes a console with operation units featuring first and second control levers, where the second lever is positioned between the operator's seat and the first lever, allowing for reduced hand movement and improved ergonomic support through strategically curved knobs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator switches between arm control lever and bucket control lever by releasing and grasping with hand, then the control operation can be performed, but operator fatigue increases
Solution Approach 1:
The patent merges the functions of two separate control levers (arm control lever and bucket control lever) into a single integrated control lever. This allows the operator to control both arm and bucket operations simultaneously without repeatedly grasping and releasing, thereby reducing operator fatigue while maintaining full control functionality.
Solution Approach 2:
The integrated control lever is designed to perform multiple functions - controlling both the arm mechanism and the bucket mechanism. By making the control lever universal, the patent eliminates the need for separate levers and reduces the repetitive hand movements required when switching between controls.
2Measurement precision
If separate control levers are provided for arm and bucket control, then precise control is achieved, but hand movement distance increases
Solution Approach 1:
The patent combines two separate control levers into one integrated control lever that can perform both arm control and bucket control functions. This merging reduces the hand movement distance required to switch between controls while maintaining precise control capability through the unified lever's multiple control positions.
Data Source
AI summary
A cab includes an operator's seat and a console. The console includes an operation unit and is located laterally of the operator's seat. The operation unit includes a first control lever and a second control lever. The second control lever is located between the operator's seat and the first control lever in a left-right direction. The first control lever includes a first knob. The second control lever includes a second knob. The first knob has a width larger than a width of the second knob as seen in a top view.