Excavator Travel Motor Control for Stable Direction Changes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional excavators with variable displacement traveling hydraulic motors frequently switch between one-speed and two-speed modes during direction changes, leading to unstable operation, especially when performing spin-turn operations.
Innovation Solution
An excavator with a control device that switches the motor capacity to a low rotation setting upon detecting a change in traveling direction, stabilizing the operation by maintaining the motor capacity in a low rotation setting during specific operations and adjusting based on load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the excavator forcibly switches to one-speed mode during spin-turn operations, then the spin-turn operation is facilitated, but the motor capacity switching becomes excessive and operation stability deteriorates
Solution Approach 1:
The control device changes the motor capacity parameter based on detected operation types. When a spin-turn operation is detected, the motor capacity is switched to a low rotation setting (first motor capacity value). When a normal travel operation is detected, the motor capacity is switched to a high rotation setting (second motor capacity value). This dynamic parameter adjustment resolves the contradiction by optimizing performance for each specific operation type.
2Ease of operation
If the motor capacity is switched frequently between one-speed and two-speed modes during direction changes, then the traveling direction changes are facilitated, but the motor operation becomes unstable
Solution Approach 1:
The control device adjusts the motor capacity parameter based on the detected operation type. For spin-turn operations, it sets the motor capacity to a low rotation setting, while for normal travel operations, it sets the motor capacity to a high rotation setting. This conditional parameter adjustment reduces unnecessary switching and stabilizes motor operation while maintaining operational flexibility.
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 solution enhances the stability and operability of the excavator by reducing frequent mode switching, ensuring stable motor operation during direction changes and load variations.
Implementation Method 1
a travelling hydraulic motor that is a variable displacement type motor configured to move the lower travelling body by being driven by hydraulic oil discharged by the hydraulic pump
Data Source
AI summary
An excavator includes a lower travelling body; an upper turning body mounted on the lower travelling body; a hydraulic pump installed in the upper turning body; a travelling hydraulic motor that is a variable displacement type motor configured to move the lower travelling body by being driven by hydraulic oil discharged by the hydraulic pump; and a control device configured to control a motor capacity of the travelling hydraulic motor so as to be switchable between a plurality of levels. The control device switches the motor capacity to a low rotation setting upon detecting that an operation for changing a travelling direction of the lower travelling body is performed.