Hydrostatic Gearbox Arrangement for Torque Control
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Solution Overview
Problem
Existing transmission arrangements in vehicles with high axle torque require complex mechanical systems, leading to high mechanical effort, potential control inaccuracies, and increased installation space due to the need for differentials and multiple mechanical connections, which complicates speed and torque control, especially during cornering.
Innovation Solution
A transmission arrangement where each axle half is driven synchronously without a differential, using controlled planetary gears and a manipulable hydrostatic device to maintain torque while adjusting wheel speeds for non-slip rolling, eliminating the need for internal differentials and reducing system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical differential is used to compensate for wheel speed differences during cornering, then speed equalization is achieved, but the system complexity and installation space increase significantly
Solution Approach 1:
The patent replaces the mechanical differential system with a hydrostatic transmission system using piston-cylinder arrangements and hydraulic fluid. This substitution eliminates complex mechanical gears and moving parts while achieving the same function of compensating for wheel speed differences during cornering through hydraulic pressure distribution.
Solution Approach 2:
The patent employs a hydrostatic transmission system where hydraulic fluid is distributed to piston-cylinder arrangements on each axle half. The hydraulic system enables smooth, controlled adjustment of wheel speeds during cornering by regulating fluid pressure, replacing the need for mechanical differential gears and reducing overall system complexity.
2Reliability
If multiple mechanical connections and internal sealing are provided for the transmission system, then torque transmission is ensured, but the system size and manufacturing complexity increase
Solution Approach 1:
The patent replaces complex mechanical connections and internal sealing requirements with a hydrostatic transmission system. The hydraulic fluid provides both torque transmission and sealing functions simultaneously, eliminating the need for multiple mechanical interfaces and complex sealing arrangements while maintaining reliable torque transmission.
3Reliability
If a clutch system is used to monitor and adapt torque, then torque control is achieved, but the system complexity and control effort increase
Solution Approach 1:
The patent replaces the clutch system with continuous electronic sensors that monitor wheel speeds and provide real-time data to a control unit. This electronic control approach eliminates mechanical clutches and their associated friction-based torque adaptation, reducing system complexity while maintaining precise torque control through electronic actuation of the hydrostatic transmission.
4Power
If the planetary drive is positioned to handle high torques close to the wheel, then torque transmission efficiency is improved, but the transmission size increases
Solution Approach 1:
The patent replaces the planetary drive mechanism with a hydrostatic transmission system using piston-cylinder arrangements. This substitution eliminates the need for complex gear sets and planetary mechanisms while achieving efficient torque transmission close to the wheel through direct hydraulic actuation, thereby reducing the overall transmission size.
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 provides a secure, efficient, and space-saving connection between the drive motor and wheels, enabling precise speed and torque control during drive and deceleration, reducing system complexity and size, and maintaining stability regardless of friction coefficients, thus enhancing driving stability and eliminating the need for internal differentials.
Implementation Method 1
A transmission arrangement is formed in which the axle halves are driven directly and synchronously and the planetary gears can be controlled by the control device using values calculated from the steering manipulation data
Implementation Method 2
via the planetary gear sets arranged on the respective planetary drive each driven wheel is controlled individually with regard to speed and torque
Implementation Method 3
with the control device having a manipulable hydrostatic device, via which the movement of each of the planet carriers and thus the planetary gears of the Abtri run to the wheels ebswellen is possible
Implementation Method 4
at least one planetary drive being assigned to each of the axle halves of a driven axle
Implementation Method 5
a torque increase otherwise associated with a speed reduction is compensated according to the invention by hydraulic power loss via the hydrostatic device while the torque remains the same
Data Source
AI summary
The invention relates to a gearbox arrangement (1), which is arranged on the drive train of a multi-axle land vehicle (2), in particular a commercial vehicle, or a similar means of transportation, wherein at least one of said axles is driven, wherein at least one planetary drive (8) is associated with each of the axle halves (5) of a driven axle. The gearbox arrangement comprises at least one sensor device (7) for detecting a steering manipulation on the vehicle (2) and a control device (6). In order to have a gearbox arrangement (1) available that establishes a reliable, simply designed connection between the drive motor and driven wheels (4) with little effort and enables reliable control of the particular wheels (4) in regard to rotational speed and torque during drive and during deceleration, and thus realizes a controllable rotational speed compensation during cornering and significantly reduces the diameter and the constructed size of the power-split gearbox in particular for vehicles (2) having a high axle torque, the axle halves (5) are driven synchronously without differential and the control device (6) is provided with a hydrostatic device (11) that can be manipulated, by means of which hydrostatic device each of the wheels (4) rolling without slip maintains the torque of said wheel.