Hydraulic Circuit for Heavy Equipment Option Devices
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Solution Overview
Problem
Conventional hydraulic circuits for heavy construction equipment fail to supply hydraulic fluid at a constant flow rate to option devices like breakers, leading to inefficient operation and difficulty in manipulating these devices, especially under varying load conditions, which affects the workability of the equipment regardless of the operator's skill level.
Innovation Solution
A hydraulic circuit with a variable displacement hydraulic pump, a first spool shifted by a pilot signal to control flow rate, a poppet for supplying hydraulic fluid, and a second spool that maintains constant pressure loss by shifting in response to pressure differences, ensuring constant fluid supply to the option device, along with orifices for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant flow rate is applied from the hydraulic pump to various kinds of option devices, then the hydraulic pump can operate simply, but it is impossible to control the flow rates to the option devices respectively according to their specifications
Solution Approach 1:
The hydraulic circuit is segmented into multiple independent flow control paths, each equipped with its own flow control valve. This allows each option device to receive hydraulic fluid at its required flow rate independently, while the hydraulic pump continues to operate with simple constant flow rate output.
Solution Approach 2:
Flow control valves are introduced as intermediary components between the hydraulic pump and the option devices. These valves mediate the hydraulic fluid flow, adjusting it to the appropriate rate for each specific option device while maintaining the pump's simple operation.
2Adaptability or versatility
If various kinds of option devices having different flow rates and pressures are used, then the equipment can perform diverse functions, but different flow rates cannot be controlled for the respective option devices
Solution Approach 1:
The flow control valves are designed with adjustable mechanisms that allow dynamic adjustment of flow rates. This enables the hydraulic system to adapt to different option device requirements by varying the flow rate for each device independently, maintaining ease of operation through straightforward valve adjustment.
Solution Approach 2:
The system changes the flow rate parameter for each option device individually through dedicated flow control valves. This allows each device to receive hydraulic fluid at its optimal flow rate parameter, enabling diverse functions while maintaining ease of operation through independent parameter control.
3Adaptability or versatility
If the option device operation speed varies depending on load fluctuation, then the option device can adapt to different loads, but even a skilled driver cannot effectively manipulate the option device
Solution Approach 1:
The flow control valves provide a feedback mechanism that compensates for load fluctuations. By allowing manual adjustment of the flow rate, the operator can compensate for changes in operation speed caused by varying loads, maintaining effective manipulation even under different operating conditions.
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 solution allows for consistent operation speed of option devices and improved efficiency by maintaining a constant flow rate, enabling even unskilled operators to easily manipulate various option devices, enhancing the overall operation of heavy construction equipment.
Implementation Method 1
The hydraulic fluid discharged from the hydraulic pump 1 flows through the supply line 8 to push the poppet 5 upward
Implementation Method 2
If a pilot signal pressure Pb is applied to the left end of the spool 3 from the outside, the spool 3 is shifted rightward
Implementation Method 3
The hydraulic fluid discharged from the hydraulic pump 1 flows through the supply line 8 to push the poppet 5 upward
Data Source
AI summary
Disclosed is a hydraulic circuit for an option device of heavy construction equipment which can facilitate manipulation of the option device such as a breaker and optionally control a flow rate by supplying hydraulic fluid from a hydraulic pump to the option device at a constant flow rate, regardless of the size of load produced on the option device. The hydraulic circuit includes a variable displacement hydraulic pump, an option device connected to the hydraulic pump, a first spool, installed in a flow path between the hydraulic pump and the option device, for being shifted in response to a pilot signal pressure applied from an outside to control a flow rate applied from the hydraulic pump to the option device, a poppet, operatively installed in a flow path between the hydraulic pump and the first spool, for supplying hydraulic fluid to the option device when the first spool is shifted, a piston resiliently urged in a back pressure chamber of the poppet, and a second spool for being shifted by a pressure difference between pressures of the hydraulic fluid before and after the hydraulic fluid passes through the first spool, and controlling the flow rate applied to the back pressure chamber of the poppet via a through-path communicating with the back pressure chamber when the second spool is shifted.