Construction Machinery Hydraulic Circuit for Excess Flow Utilization
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Solution Overview
Problem
In hydraulic excavators, excess flow rate from a first hydraulic pump during simultaneous operations of straight travel and front work machine operations is wasted without being utilized effectively.
Innovation Solution
A hydraulic circuit with capacity-variable pumps, switch valves, and a controller that manages the flow direction and distribution of hydraulic oil among travel motors and actuators, allowing excess flow from one pump to be used by other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic oil is supplied from the first hydraulic pump to the hydraulic actuator during simultaneous operation of straight travel and front work machine, then the front work machine operation is ensured, but the excess flow rate of the first hydraulic pump is wasted
Solution Approach 1:
The first hydraulic pump is designed to serve multiple functions: it can supply hydraulic oil to the hydraulic actuator for front work machine operations and simultaneously supply excess flow to the first travel motor for straight travel operations. This multi-functionality allows the pump to utilize its excess capacity productively rather than wasting it
Solution Approach 2:
A communication valve is introduced as an intermediary component that enables hydraulic oil to flow from the first pump line to the second pump line. This intermediary mechanism facilitates the transfer of excess flow from the first hydraulic pump to the first travel motor, resolving the waste problem while maintaining the primary function of supplying the hydraulic actuator
2Stability of the object's composition
If the same amount of hydraulic oil is supplied from the second hydraulic pump to both first and second travel motors during simultaneous operation, then straightness of driving is ensured, but the hydraulic system complexity increases
Solution Approach 1:
The hydraulic system is segmented into independent control paths: the first hydraulic pump and first travel switch valve control the first travel motor, while the second hydraulic pump and second travel switch valve control the second travel motor. This segmentation allows independent control of each travel motor, enabling straightness maintenance through coordinated control without requiring complex interdependencies
Solution Approach 2:
The controller receives signals from travel operators and automatically adjusts the switch valves to distribute hydraulic oil appropriately to maintain straight travel. This feedback-based automatic control simplifies the operational complexity by replacing manual coordination with automated decision-making based on operator inputs
Data Source
AI summary
Problem: Provide a hydraulic circuit of a construction machinery that can effectively use the excess flow rate of the first hydraulic pump. Solution: In the hydraulic circuit, when signals are output from the first travel operator, the second travel operator, and the actuator operator, hydraulic oil is supplied from the first hydraulic pump to the actuator switch valve. Hydraulic oil is also supplied from the second hydraulic pump to the first travel switch valve and the second travel switch valve. Further, according to the signal output from the actuator operator, the opening degree of the communication valve is adjusted to control the supply amount of hydraulic oil sent from the first pump line to the second pump line.