Cross-Connected Roller Drive Hydraulics for Slippage Control
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Solution Overview
Problem
Existing ground processing machines face issues with slippage in drive roller segments, leading to inefficiencies and energy loss due to the use of flow dividers in hydraulic drive systems, particularly in electro-hydraulic systems where energy storage is limited.
Innovation Solution
A hydraulic drive system with cross-connected traction drive hydraulic motors and pumps, eliminating the need for flow dividers, ensures efficient energy use by preventing excessive fluid outflow during slippage, and allowing for independent operation of drive roller segments with a structurally simpler design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flow dividers are used to prevent slippage in drive roller segments, then torque transmission is maintained during slippage, but device complexity increases and energy efficiency decreases
Solution Approach 1:
The drive rollers are divided into multiple independently driven roller segments, each with its own hydraulic motor. This segmentation allows individual segments to be controlled separately, enabling torque redistribution without complex flow dividers by simply isolating the slipping segment's hydraulic supply.
Solution Approach 2:
The flow divider component is completely removed from the hydraulic system. Instead of using flow dividers to manage fluid distribution, the system extracts this function by using separate hydraulic circuits for each motor, where slippage is handled by isolating individual motor-fluid connections rather than managing flow distribution centrally.
2Reliability
If flow dividers are used to maintain fluid supply during slippage, then torque transmission is maintained, but energy efficiency decreases due to throttling losses
Solution Approach 1:
The flow divider component is completely removed from the hydraulic system. Instead of using flow dividers to manage fluid distribution, the system extracts this function by using separate hydraulic circuits for each motor, where slippage is handled by isolating individual motor-fluid connections rather than managing flow distribution centrally.
Solution Approach 2:
During slippage, the hydraulic supply to the affected motor is partially restricted by closing its supply valve, rather than throttling flow through a flow divider. This partial action (complete valve closure or opening) eliminates throttling losses while still preventing excessive fluid outflow from the slipping motor.
3Reliability
If independent hydraulic motors are used for each drive roller segment, then slippage can be controlled, but device complexity increases
Solution Approach 1:
The drive rollers are divided into multiple independently driven roller segments, each with its own hydraulic motor. This segmentation allows individual segments to be controlled separately, enabling torque redistribution without complex flow dividers by simply isolating the slipping segment's hydraulic supply.
Solution Approach 2:
Each hydraulic motor has its own supply and return line connections with individual control valves. This self-service design allows each motor to be independently controlled without requiring complex centralized flow management systems, reducing overall system complexity while maintaining slippage control capability.
4Device complexity
If electro-hydraulic drive system is used with limited energy storage, then compact design is achieved, but energy efficiency becomes critical
Solution Approach 1:
During slippage, the hydraulic supply to the affected motor is partially restricted by closing its supply valve, rather than throttling flow through a flow divider. This partial action (complete valve closure or opening) eliminates throttling losses while still preventing excessive fluid outflow from the slipping motor.
Solution Approach 2:
The system converts the harmful effect of slippage (excessive fluid outflow and energy loss) into a beneficial control mechanism. By monitoring fluid flow from each motor and selectively isolating slipping segments, the system uses the slippage condition itself as a trigger for automated hydraulic circuit adjustment, improving overall energy efficiency.
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 system effectively prevents slippage and energy loss, maintaining consistent rotational speeds and torque across drive roller segments, enhancing energy efficiency and reducing the need for complex adjustments, especially in electro-hydraulic systems.
Implementation Method 1
a first traction drive hydraulic pump (P1), a second traction drive hydraulic pump (P2), at least one drive motor for driving the first traction drive hydraulic pump (P1) and the second traction drive hydraulic pump (P2) for supplying hydraulic fluid to the traction drive hydraulic motors
Implementation Method 2
a first traction drive hydraulic motor (M1), a second traction drive hydraulic motor (M2), a third traction drive hydraulic motor (M3), a fourth traction drive hydraulic motor (M4)
Data Source
AI summary
In a ground processing machine having two drive rollers arranged longitudinally and rotatable about a respective axis of rotation, wherein each drive roller comprises two drive roller segments aligned along the direction of the associated axis of rotation, having a hydraulic drive system for the drive rollers, a first fluid connection of a first traction drive hydraulic pump is connected or connectable by means of a first hydraulic line to a first and second traction drive hydraulic motor, and a first fluid connection of a second traction drive hydraulic pump is connected or connectable by means of a second hydraulic line to a third and fourth traction drive hydraulic motor. A second fluid connection of the first pump is connected or connectable by means of a third hydraulic line to the second and third motors, and a second fluid connection of the second pump is connected or connectable by means of a fourth hydraulic line to the first and fourth motors.