Hydraulic Control Valve Flow Restriction for Dump Truck Vessel Stability
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Solution Overview
Problem
Conventional dump trucks experience vessel floating issues during travel on bumpy roads, leading to uncomfortable operator experiences and reduced durability due to repeated collisions with the vehicle body, and the need for costly sensors to detect floating movements.
Innovation Solution
Incorporating a flow rate limiting section in the control valve device to restrict hydraulic oil flow, generating a thrust force that keeps the vessel seated on the vehicle body, eliminating the need for sensors and enhancing stability on uneven road surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor is added to detect vessel floating movements, then the vessel stability can be improved, but the device complexity and cost increase
Solution Approach 1:
The hydraulic system automatically generates a thrust force through the flow rate limiting section that keeps the vessel seated on the vehicle body during travel. The system uses its own hydraulic oil flow to create a counteracting force against vessel floating, eliminating the need for external sensors or additional detection devices.
Solution Approach 2:
The invention uses hydraulic pressure generated by limiting the flow rate of hydraulic oil to create a thrust force. The flow rate limiting section creates resistance to oil flow, generating pressure that translates into a mechanical thrust force to counteract the vessel floating caused by bumpy road surfaces.
2Reliability
If the control valve device is switched to the lowering position to restrict vessel floating, then the vessel stability improves, but the energy consumption increases due to continuous hydraulic pump operation
Solution Approach 1:
The flow rate limiting section continuously generates a thrust force by restricting hydraulic oil flow throughout the travel period. This continuous hydraulic action maintains vessel stability without requiring the control valve device to remain in the energy-intensive lowering position, thereby reducing overall energy consumption 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
The solution effectively restricts vessel floating on bumpy roads, ensuring stable seating and reducing operator discomfort and vehicle wear, while avoiding the cost of sensor implementation.
Implementation Method 1
a flow rate limiting section is provided in the floating position of the control valve device to limit a flow rate of the hydraulic oil flowing in the return line
Implementation Method 2
a hydraulic pump for delivering pressurized oil as the hydraulic oil to supply the pressurized oil to a bottom-side oil chamber or a rod-side oil chamber in the hoist cylinder
Implementation Method 3
a hoist cylinder which is provided between the vessel and the vehicle body and tilts the vessel upward or downward with expansion or contraction of a rod therein
Implementation Method 4
a floating position of discharging the hydraulic oil in the bottom-side oil chamber by self-weight of the side of the vessel to contract the hoist cylinder and allow for self-weight fall of the vessel
Data Source
AI summary
A control valve device (19) controls supply and discharge of pressurized oil to and from a hoist cylinder (12) which tilts a vessel (3). A throttle (24C) that limits a flow rate of hydraulic oil which is discharged from a hydraulic pump (13) and flows in a return line (16) through a pump line (15), a first directional control valve (24) and a center bypass oil passage (23) is provided in the floating position (F) of the first directional control valve (24). When the first directional control valve (24) is in the floating position (F), the upstream side of the throttle (24C) is connected to the pump line (15), and the downstream side of the throttle (24C) is connected to the return line (16). In addition, a rod-side actuator line (18) communicated with rod-side oil chambers (12E, 12F) in the hoist cylinder (12) is connected to the pump line (15).