Hydrostatic Transmission Slope Torque Balancing
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Solution Overview
Problem
Hydrostatic transmission systems in mobile machines tend to cause the rear axle to drift and skid when traveling on a slope due to uneven distribution of braking torque, which is exacerbated by the half-parallel/half-series transmission architecture.
Innovation Solution
Incorporating valves in the series ducts that adjust pressure in response to a control instruction, specifically reducing pressure in the series duct on the lower side of the tilt to balance braking torque between the front and rear wheels, preventing skidding and maintaining a straight trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a half-parallel/half-series hydrostatic transmission architecture is used, then wheel synchronization and equal output torques are achieved, but braking torque distribution becomes uneven on slopes causing rear axle drift and skidding
Solution Approach 1:
The patent introduces individual pressure control valves for each series duct (3g, 3d), allowing localized adjustment of pressure in specific branches of the hydrostatic transmission system. This enables independent regulation of braking torque for each wheel pair, correcting the uneven distribution caused by the half-parallel/half-series architecture while maintaining wheel synchronization.
2Force
If pressure is increased in series ducts to improve braking torque, then braking effectiveness increases, but rear axle skidding worsens due to excessive torque transfer to front wheels
Solution Approach 1:
The patent modifies the pressure parameter in the series ducts by introducing control valves that can adjust pressure levels dynamically. By reducing pressure in the series ducts during braking on slopes, the system prevents excessive torque transfer to the front wheels, thereby eliminating rear axle skidding while maintaining adequate braking effectiveness through optimized pressure distribution.
3Adaptability or versatility
If the machine travels on a slope with tilt, then operational versatility is improved, but trajectory stability deteriorates due to rear axle drift
Solution Approach 1:
The patent implements a control system that monitors the machine's operating conditions and automatically adjusts the pressure in the series ducts through the control valves. This feedback mechanism detects when the machine is operating on a slope and dynamically balances the braking torque distribution, preventing rear axle drift and maintaining trajectory stability during slope operations.
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 balances braking torque across all wheels, preventing skidding and ensuring the machine travels in a straight line on slopes by dynamically adjusting pressure through the use of valves activated by slope and tilt sensors.
Implementation Method 1
each series duct 3g, 3d includes a valve having an opening for the passage of the fluid into the series duct, said valve having a position in which said opening has a maximum section and another position in which said opening has a smaller section
Data Source
AI summary
A hydrostatic transmission device of a mobile machine having —at least one first motor and at least one second motor, —at least one first dual motor and at least one second dual motor each having first and second elementary motor, —the second elementary motor of the first dual motor is linked with the first motor by a serial duct, —the second elementary motor of the second dual motor is linked with the second motor by a serial duct, —each serial duct has a valve having an opening for passage of the fluid into the serial duct, said valve having a first position in which said opening has a maximum cross-section, and a second position in which said opening has a reduced cross-section, the movement of said valve between these two positions activated a control instruction generated when the machine is travelling on a slope.