Torque Fluctuation Inhibiting Device Using Cam Mechanisms
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Solution Overview
Problem
Existing torque fluctuation inhibiting devices struggle to effectively reduce torque fluctuations across a wide range of rotational speeds, particularly when engine specifications change, as they require adjustments in inertia and spring constants, which can be difficult to implement.
Innovation Solution
A torque fluctuation inhibiting device featuring a mass body with centrifugal elements and cam mechanisms that convert centrifugal forces into circumferential forces to synchronize the rotation of a rotor and mass body, allowing for adjustable torque fluctuation reduction across a wide rotational speed range, including during engine cylinder deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dynamic damper device with inertia rings and coil springs is used to reduce torque fluctuations, then torque fluctuations can be reduced in a predetermined rotational speed range, but the device requires adjustment of inertia amount and spring constant when engine specifications change, making it difficult to maintain effectiveness across different engine types
Solution Approach 1:
The patent changes the fundamental parameters of the damper device by replacing coil springs with cam mechanisms and adjusting inertia ring characteristics. The cam mechanisms convert radial centrifugal forces into circumferential damping forces, and the inertia rings are designed with specific moment of inertia values and width variations that allow effective torque fluctuation reduction across a wide rotational speed range without requiring adjustments for different engine specifications
Solution Approach 2:
The patent employs dynamic elements including inertia rings that can rotate relative to the housing, cam mechanisms that convert radial to circumferential motion, and centrifugal force utilization. These dynamic components automatically adapt to varying rotational speeds, maintaining effectiveness across different engine types without manual adjustment
2Reliability
If the inertia amount of inertia rings and spring constant of coil springs are changed to match different engine specifications, then torque fluctuation reduction can be optimized for specific engines, but this requires complex adjustments and redesigns
Solution Approach 1:
The patent employs fixed geometric parameters in the cam mechanisms and inertia ring dimensions that are optimized for a wide rotational speed range. The cam profile shapes and inertia ring width variations are designed to provide effective damping across different engine types without requiring adjustment, simplifying manufacturing and installation
Solution Approach 2:
The damper device is designed as a universal component that can be applied to multiple engine types. The cam mechanisms and inertia rings work together to provide torque fluctuation reduction effectiveness across a wide rotational speed range, eliminating the need for specification-specific adjustments and enabling single-design-wide-application
3Stability of the object's composition
If conventional dampers with torsion springs are used, then torque transmission stability can be maintained, but they cannot effectively reduce torque fluctuations across a wide rotational speed range
Solution Approach 1:
The patent replaces the conventional torsion spring mechanical system with cam mechanisms that utilize centrifugal force. This substitution enables the damper to effectively operate across a wide rotational speed range while maintaining torque transmission stability, as the cam mechanisms dynamically adapt to varying speeds through centrifugal force conversion
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 device effectively reduces torque fluctuations across a broad rotational speed range by utilizing centrifugal forces and cam mechanisms, allowing for optimal performance regardless of engine specifications, thereby enhancing torque transmission stability.
Implementation Method 1
Each of the first and second centrifugal elements is disposed to receive a centrifugal force to be generated by rotation of the rotor and the mass body. When a relative displacement is produced between the rotor and the mass body in a rotational direction, the first cam mechanism converts the centrifugal force acting on the first centrifugal element into a first circumferential force directed to reduce the relative displacement.
Data Source
AI summary
A torque fluctuation inhibiting device includes a mass body, first and second centrifugal elements, and first and second cam mechanisms. The mass body is rotatable with a rotor and is also rotatable relatively to the rotor. Each of the first and second centrifugal elements receives a centrifugal force to be generated by rotation of the rotor and the mass body. When a relative displacement is produced between the rotor and the mass body in a rotational direction, the first cam mechanism converts the centrifugal force that acts on the first centrifugal element into a first circumferential force directed to reduce the relative displacement. When the relative displacement is produced between the rotor and the mass body in the rotational direction, the second cam mechanism converts the centrifugal force that acts on the second centrifugal element into a second circumferential force directed to reduce the relative displacement.