Hydraulic Travel Force Equalization for Straight-Running Machines
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Solution Overview
Problem
Existing working machines do not adequately address straight-driveability during intermediate operation, where the control devices are operated between neutral and maximum positions, leading to suboptimal traveling performance.
Innovation Solution
A working machine equipped with a hydraulic pump system that includes a correction mechanism to equalize the driving forces of the first and second traveling hydraulic actuators when both operation devices are operated at the same extent, improving straight-traveling performance by connecting the first and second output tubes via a communication tube and utilizing a traveling independent valve to manage fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the right and left control devices are operated simultaneously at the same operation amount, then the working machine travels straight ahead, but the straight-driveability is not adequately improved during intermediate operation
Solution Approach 1:
The invention changes the pressure parameter by introducing a correction mechanism that equalizes the pressure between the right and left hydraulic actuators during intermediate operation. This pressure equalization ensures that both traveling devices receive equal driving force, improving straight-driveability without requiring full-stroke operation of the control devices.
Solution Approach 2:
The invention introduces a pressure equalization mechanism as an intermediary between the right and left hydraulic actuators. This mechanism includes a communication channel that allows pressure equalization, ensuring that both sides receive equal driving force during intermediate operation, thereby improving straight-driveability.
2Reliability
If the traveling bypass valve is switched to equalize driving forces, then straight-driveability improves, but the device complexity increases
Solution Approach 1:
The invention merges the correction mechanism with the existing traveling independent valve assembly. The communication channel for pressure equalization is integrated into the valve body structure, and the correction mechanism shares components with the bypass mechanism, thereby reducing overall device complexity while maintaining straight-driveability improvement.
Solution Approach 2:
The traveling independent valve assembly is designed to perform multiple functions: it serves as both the bypass valve for equalizing driving forces and as part of the correction mechanism for pressure equalization. This multi-functionality reduces the need for separate dedicated components, thereby reducing 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
Enhances traveling straightness during intermediate operations by ensuring equal driving forces to the traveling devices, thereby improving overall traveling performance and straight-driveability.
Implementation Method 1
a hydraulic pump (first hydraulic pump) that supplies pressurized fluid
Implementation Method 2
connecting the first and second output tubes via a communication tube
Data Source
Figure 1
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AI summary
A working machine (1) includes a hydraulic pump (18, 19), a first traveling device (3R) configured to be driven by a first traveling hydraulic actuator (MR), a second traveling device (3L) configured to be driven by a second traveling hydraulic actuator (ML), a first output tube (41) configured to connect a first output port (P1) of the hydraulic pump (18, 19) to the first traveling hydraulic actuator (MR), a second output tube (42) configured to connect a second output port (P2) of the hydraulic pump (18, 19) to the second traveling hydraulic actuator (ML), a first operation device (44R) configured to operate the first traveling device (3R), a second operation device (44L) configured to operate the second traveling device (3L), and a correction mechanism (60A, 60B, 60C) configured to equalize a driving force of the first traveling hydraulic actuator (MR) and another driving force of the second traveling hydraulic actuator (ML) when the first operation device (44R) and the second operation device (44L) are operated each at same operation extents to perform a straight-traveling operation.