Hydraulic Pump Fail-Safe Flow Switching for Electrical Malfunctions
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Solution Overview
Problem
The existing hydraulic drive systems with fail-safe functions for malfunctions like wire breakage and short circuits require additional components, leading to increased size, weight, and manufacturing costs, especially in construction equipment with multiple pumps.
Innovation Solution
A hydraulic drive system incorporating two variable-capacitance hydraulic pumps, a switch valve, and a malfunction detection device that allows operating oil from both pumps to be merged and directed to actuators when a malfunction is detected, minimizing the reduction in operating speed and reducing the number of components needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional components (horsepower control piston, oil path) are added to provide fail-safe function, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The existing switch valve is designed to perform multiple functions: normal operation flow switching and fail-safe compensation. By enabling the switch valve to connect both hydraulic pumps to both actuators during malfunction, the system achieves fail-safe capability without adding dedicated compensation components, thus reducing device complexity while maintaining reliability
2Reliability
If additional components (horsepower control piston, oil path) are added to provide fail-safe function, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The switch valve is utilized for dual purposes: routine operational flow management and emergency fail-safe compensation. This eliminates the need for separate dedicated fail-safe components, thereby reducing manufacturing cost while ensuring reliability through the malfunction detection device and alternative pump-actuator connectivity
3Reliability
If additional components (horsepower control piston, oil path) are added to provide fail-safe function, then reliability is improved, but weight increases
Solution Approach 1:
The switch valve serves dual purposes: normal operational flow switching and fail-safe compensation. By leveraging this existing component's multi-functionality, the system achieves reliable fail-safe operation without adding dedicated compensation components, thereby avoiding increased regulator weight while maintaining reliability
4Reliability
If additional components (horsepower control piston, oil path) are added to provide fail-safe function, then reliability is improved, but size increases
Solution Approach 1:
The switch valve is designed to perform multiple functions: normal operation flow switching and fail-safe compensation. By enabling the switch valve to connect both hydraulic pumps to both actuators during malfunction, the system achieves fail-safe capability without adding dedicated compensation components, thus reducing regulator size while maintaining reliability
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 configuration achieves a fail-safe operation while minimizing the reduction in operating speed and reducing the number of components, thus controlling manufacturing costs.
Implementation Method 1
a first hydraulic pump of a variable capacitance type that dispenses operating oil to supply the operating oil to a first hydraulic actuator
Implementation Method 2
a switch valve capable of switching between a first valve position and a second valve position... the control device switches the switch valve to the third valve position
Data Source
AI summary
A hydraulic drive system includes: a first hydraulic pump of the variable capacitance type; a first regulator including a first proportional valve; a second hydraulic pump that dispenses operating oil; a switch valve; a control device; and a malfunction detection device. The switch valve can switch to a third valve position in which the switch valve allows the operating oil dispensed from both the first hydraulic pump and the second hydraulic pump to be supplied to first and second traveling hydraulic motors and first and second hydraulic actuators. The control device controls the operation of the first proportional valve by outputting a first flow rate command signal to the first proportional valve, and when the malfunction detection device detects a malfunction of an electrical system related to the first proportional valve, the control device switches the switch valve to the third valve position.