Double-Piston Torque Coupling With Independent Pressure Control
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Solution Overview
Problem
Existing torque-distribution devices in motor vehicles lack independent control over pressure chambers, limiting their ability to quickly switch between operating positions and efficiently manage torque distribution.
Innovation Solution
The torque-distribution device features separate feed lines for the primary and secondary pressure chambers, allowing independent control over pressure application and release, enabling faster switching and more precise control of torque distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common feed line supplies pressure medium to both pressure chambers, then the device complexity is reduced, but the switching speed and control precision deteriorate
Solution Approach 1:
The common feed line is segmented into separate feed lines for the primary and secondary pressure chambers. This allows independent control of pressure medium flow to each chamber, enabling faster switching speeds and more precise control without the complexity penalty of a fully integrated system.
Solution Approach 2:
The feed line configuration is made dynamically controllable through valve devices that can independently regulate pressure medium flow to each pressure chamber. This dynamic control capability enables rapid switching between different operating states while maintaining manageable system complexity through modular valve design.
2Stability of the object's composition
If pressure is applied to both pressure chambers simultaneously, then the torque distribution is balanced, but the release clearance cannot be overcome quickly
Solution Approach 1:
The secondary pressure chamber is pressurized in advance before the primary pressure chamber to overcome the release clearance. This preliminary action prepares the system for rapid torque engagement by first eliminating the clearance, then applying full torque distribution pressure to both chambers for balanced operation.
Solution Approach 2:
The pressure application occurs in distinct periodic phases: first pressurizing the secondary chamber to overcome clearance, then pressurizing the primary chamber for balanced torque distribution. This periodic sequencing optimizes both response time and torque balance.
3Device complexity
If the pressure chambers have the same filling volume, then the design is simplified, but the piston transfer speed is reduced
Solution Approach 1:
The pressure chambers are designed with different filling volumes optimized for their specific functions. The secondary pressure chamber has a smaller volume for rapid piston transfer and clearance overcoming, while the primary pressure chamber has a larger volume for stable torque distribution. This local optimization of chamber volumes improves overall system performance without excessive design complexity.
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 design allows for rapid adjustment of pressure ratios and piston positions, reducing hysteresis and delay in torque distribution, thereby enhancing the device's control behavior and operational efficiency.
Implementation Method 1
a pressure medium can be introduced into a primary pressure chamber and a secondary pressure chamber via separate feed lines and pressure can be applied independently of one another to a primary piston and a secondary piston
Implementation Method 2
the pistons can each slide on a sealing element, e.g., a stationary sealing element arranged on the retaining element
Data Source
AI summary
A torque-distribution device includes a rotor carrier couplable to an input shaft, a clutch device having a disc pack, and an actuation device for actuating the clutch device. The actuation device includes a primary piston, and a secondary piston. The primary piston delimits a primary pressure chamber and is movable against the disc pack when pressure is applied to the primary pressure chamber. The secondary piston delimits a secondary pressure chamber and is movable to move the primary piston against the disc pack when pressure is applied to the secondary pressure chamber. Pressure medium arranged in the primary pressure chamber is supplied by a first feed line and pressure medium arranged in the secondary pressure chamber is supplied by a second feed line, independent of the first feed line, such that pressure can be applied to the primary piston and to the secondary piston independently.