Hydraulic Driving Device With Internal Flow Regulator
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Solution Overview
Problem
The existing hydraulic driving devices for industrial vehicles are bulky and costly due to the external placement of electromagnetic proportional valves required for controlling the main spool in regenerative control valve blocks.
Innovation Solution
The hydraulic driving device integrates a flow regulator within the main spool, eliminating the need for external pilot electromagnetic proportional valves by using a flange-shaped resistance component and a spring to control the flow rate, thereby reducing size and cost while maintaining constant operation speed and regeneration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electromagnetic proportional valves are disposed outside the main spool for controlling the main spool in a regenerative control valve block, then the control function is achieved, but the device size and manufacturing cost increase
Solution Approach 1:
The flow regulator is merged with the main spool by disposing it inside the main spool, combining two separate components (main spool and flow regulator) into a single integrated structure, thereby reducing the overall valve block size and simplifying the device structure while maintaining the control function
Solution Approach 2:
The flow regulator is nested inside the main spool, with the flow regulator positioned within the internal structure of the main spool, allowing compact arrangement of components and reducing the external dimensions of the valve block
2Device complexity
If electromagnetic proportional valves are disposed outside the main spool for controlling the main spool in a regenerative control valve block, then the control function is achieved, but the manufacturing cost increases
Solution Approach 1:
The flow regulator is merged with the main spool, reducing the total component count and assembly steps, which directly lowers manufacturing cost while maintaining the necessary control functionality
Solution Approach 2:
The flow regulator function is extracted from the external valve configuration and integrated into the main spool structure, eliminating the need for separate external electromagnetic proportional valves and their associated mounting hardware, thereby reducing manufacturing complexity and cost
3Device complexity
If the flow rate of hydraulic oil flowing from the hydraulic cylinder to the tank is not controlled, then the structure is simple, but the operation speed becomes unstable due to temperature variations
Solution Approach 1:
The flow regulator provides feedback control of the hydraulic oil flow rate from the hydraulic cylinder to the tank, automatically adjusting the flow to maintain stable operation speed despite temperature variations, ensuring consistent system performance
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 space-saving and cost-effective design while maintaining consistent operation speed and improving regeneration efficiency, preventing flow rate changes due to temperature variations and ensuring reliable hydraulic oil flow.
Implementation Method 1
a flow regulator which is disposed inside the main spool to control a flow rate of the hydraulic oil flowing from the hydraulic cylinder to the tank
Implementation Method 2
the flow regulator spool may include a sliding portion which slides with respect to the main spool and a rod portion which extends from the sliding portion in the movement direction of the main spool
Data Source
AI summary
A hydraulic driving device of an industrial vehicle includes: a tank which stores hydraulic oil; a hydraulic pump which includes a suction port sucking the hydraulic oil and a discharge port discharging the hydraulic oil; a hydraulic cylinder which is driven by the hydraulic oil discharged from the discharge port of the hydraulic pump; a direction switching valve which is disposed among the hydraulic pump, the tank, and the hydraulic cylinder and switches a hydraulic oil flow direction in response to an operation state of operation means for driving the hydraulic cylinder; in which the direction switching valve includes a main spool which moves in response to the operation state of the operation means and a flow regulator which is disposed inside the main spool to control a flow rate of the hydraulic oil flowing from the hydraulic cylinder to the tank.