Working Machine Travel Speed Control via Fluid Flow Steps
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Solution Overview
Problem
Operators of working machines face difficulties in maintaining a consistent traveling speed due to the swinging motion of the travel lever, making it challenging to control the operation amount effectively.
Innovation Solution
A working machine design featuring a traveling device that adjusts speed based on the flow rate of operation fluid, with a switching operation portion allowing multiple step changes in fluid supply, including speed-up and speed-down switches on separate operation devices to facilitate easier speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the operator controls the operation amount of the traveling lever to change traveling speed, then the traveling speed can be adjusted, but it becomes difficult to keep the operation amount constant due to the travel lever swinging depending on the rolling of the working machine
Solution Approach 1:
The invention divides the continuous speed control into discrete speed steps (first speed step, second speed step, etc.). The switching operation portion allows the operator to select from multiple predetermined speed steps rather than continuously adjusting the traveling lever operation amount. This segmentation resolves the contradiction by eliminating the need to maintain a constant operation amount, as each speed step corresponds to a specific operation amount that is automatically maintained.
2Speed
If the travel lever is swung depending on the rolling of the working machine, then the working machine can move, but it becomes difficult for the operator to keep the operation amount of the travel lever constant
Solution Approach 1:
The system pre-establishes multiple speed steps with predetermined operation amounts stored in advance. When the operator selects a speed step using the switching operation portion, the corresponding operation amount is automatically set without requiring the operator to manually adjust or maintain it during machine rolling. This preliminary preparation of speed steps ensures reliable and consistent operation amounts regardless of machine movement.
3Ease of operation
If multiple speed steps are provided with switching operation portion, then the traveling speed can be easily controlled, but the device complexity increases
Solution Approach 1:
The switching operation portion is integrated into the existing operation control system, allowing a single component to serve multiple functions: selecting different speed steps, controlling traveling speed, and maintaining operation amounts. This multi-functionality approach provides easy speed control through the switching portion while avoiding the need for separate complex control mechanisms for each function.
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
Enables operators to maintain a consistent traveling speed without adjusting the operation amount of the traveling control device, improving control precision and ease of operation.
Implementation Method 1
a traveling motor (hydraulic actuator) to change a traveling speed of the working machine in accordance with a flow rate of an operation fluid
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A working machine includes a traveling device to change a traveling speed in accordance with a flow rate of an operation fluid, a traveling operation device to change the flow rate of the operation fluid to be supplied to the traveling device, and a switching operation portion to change, at multiple steps, a supply amount of the operation fluid to be supplied to the traveling device, the supply amount corresponding to an operation extent of the traveling operation device.