Radial Piston Damped Torsional Coupling for Vibration Control
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Solution Overview
Problem
Existing torsional couplings face limitations in effectively damping torsional vibrations and accommodating design variability across different applications, as they often rely on simple lubrication and friction, which may not suffice for diverse torque demands.
Innovation Solution
A radial piston damped torsional coupling design featuring a fluted perimeter surface and reciprocally received pistons and barrels, with a spring biasing system and a damping liquid pressure regulator, allowing for variable volume chambers and enhanced damping through liquid displacement in response to torsional vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simple lubrication and friction are used for damping, then device complexity is reduced, but damping effectiveness deteriorates
Solution Approach 1:
The patent introduces a hydraulic damping mechanism where damping fluid is contained within the coupling elements. The fluid passes through restricted passages or holes during relative rotation, creating hydrodynamic damping effects that significantly improve vibration suppression compared to simple friction-based methods.
Solution Approach 2:
The patent enables adjustment of damping characteristics by modifying parameters such as fluid viscosity, passage geometry, and preload forces on friction elements. This allows optimization of damping effectiveness for different operating conditions without fundamentally changing the device structure.
2Adaptability or versatility
If fixed damping characteristics are used, then device complexity is reduced, but adaptability to different torque demands deteriorates
Solution Approach 1:
The patent incorporates adjustable damping elements that can modify their characteristics during operation or between operations. Friction elements with adjustable preload, variable viscosity fluids, or movable damping components allow the coupling to adapt to different torque levels and vibration frequencies encountered in various applications.
Solution Approach 2:
The patent provides mechanisms to change damping parameters such as fluid viscosity through temperature control or pressure adjustment, and friction forces through adjustable springs or actuators. This enables the same coupling device to serve multiple applications with different torque requirements.
3Reliability
If increased friction contact is used for damping, then damping effectiveness is improved, but wear increases
Solution Approach 1:
The patent introduces hydraulic damping as a complementary or alternative mechanism to friction-based damping. The damping fluid absorbs vibration energy through viscous flow and pressure changes, reducing reliance on friction contact and thereby minimizing wear on mating surfaces while maintaining effective vibration suppression.
Solution Approach 2:
The damping fluid acts as an intermediary between the friction elements, providing an additional damping mechanism that does not require direct metal-to-metal contact. This mediator reduces the wear burden on friction surfaces while contributing to overall damping effectiveness.
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 effectively dampens torsional vibrations and adjusts torsional stiffness to accommodate various torque orientations and applications, providing improved performance and durability by utilizing a continuum of torque orientations and adjustable damping liquid pressure.
Implementation Method 1
A spring biases the pistons and barrels to extend toward a position where a contact end is in contact with one of the flutes
Implementation Method 2
The contact end is an edge of a roller that rolls on the fluted perimeter surface in one of the flutes
Implementation Method 3
Some damping occurs due to the presence of lubricating fluid and friction at the piston contact with the second coupling element as well as with its respective barrel
Implementation Method 4
Some damping occurs due to the presence of lubricating fluid and friction at the piston contact with the second coupling element as well as with its respective barrel
Data Source
AI summary
A damped torsional coupling is utilized to couple a drive shaft to a work shaft while permitting some relative rotation due to torsional vibrations. The coupling includes a second coupler oriented to rotate with respect to a first coupler about an axis through a continuum of negative to positive torque orientations. The first coupler defines a fluted perimeter surface with a number of flutes, distributed with radial symmetry about the axis. The second coupler a number of pistons reciprocally received in respective barrels to define a variable volume chamber fluidly connected to a damping passage. A spring biases the pistons and barrels to extend toward a position in contact with one of the flutes. The contact end may be an edge of a roller that rolls on the fluted perimeter surface in one of the flutes responsive to torques transmitted between the couplers.