Hydrostatic Pump Orifice Disengagement for Torque Balance
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Solution Overview
Problem
Hydrostatically driven machines face issues with torque balance and speed discrepancies between motivators due to pressure changes and uneven terrain, leading to undesirable 'uncompaction' of soil and reduced part life from overdriving.
Innovation Solution
A method and system that includes a selectively disengagable fluid control orifice between the pumps, allowing fluid communication between a first and second pump, which can be disconnected based on signals from sensors or operator input when pressure differentials or rotational speed disparities exceed preset levels, preventing excessive fluid flow and spinning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If two pumps are coupled with an orifice to balance load, then the torque balance between motivators is improved, but the balance is adversely affected by pressure changes from uneven terrain
Solution Approach 1:
The patent removes the orifice from the system entirely, replacing it with independently controlled two-pump architecture. Each pump can be independently regulated to maintain torque balance without relying on passive flow restriction, thereby maintaining balance stability under varying terrain conditions while eliminating the torque balance issues caused by pressure changes.
2Productivity
If the orifice remains engaged during operation on uneven terrain, then fluid flow between pumps is maintained, but the drum or wheels spin causing uncompaction and reduced part life
Solution Approach 1:
The patent implements dynamic control where the two pumps can independently adjust their operation based on real-time conditions. When terrain variations cause pressure differentials or speed disparities, the system dynamically responds by allowing one pump to slow down or stop while the other continues, preventing motor spinning and uncompaction while maintaining continuous operation capability.
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 minimizes uncompaction and extends part life by maintaining optimal engine speed and reducing overdriving, enhancing operational efficiency and fuel economy.
Implementation Method 1
an orifice may be provided between the working sides of the pumps to balance the load during normal usage
Implementation Method 2
The hydraulic pump propels a flow of fluid to one or more actuators, typically hydraulic motors, connected to motivators
Implementation Method 3
the weight of the machine typically shifts somewhat off of the drum, forcing fluid across the orifice to the uphill pump
Data Source
AI summary
Fluid control propulsion system, machine including the system, and method of controlling the propulsion of a machine having a compacting drum and a wheel mounted on an axle, drum and axle motors operatively connected with the drum and the axle, respectively, and drum and axle pumps operatively connected to an engine and fluidly connected to the pumps. A fluid control orifice disposed in fluid communication between the pumps is selectively disengageable in response to at least one of operator instruction, sensed pressure differential between the drum and axle pumps, and sensed disparity in rotational speed between the drum and axle.