Torque Fluctuation Inhibiting Device Using Cam Mechanism
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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, requiring adjustments in inertia and spring constants when engine specifications change, which can be difficult to implement.
Innovation Solution
A torque fluctuation inhibiting device featuring a mass body, centrifugal element, and cam mechanism that converts centrifugal force into a circumferential force to synchronize rotor and mass body rotation, allowing for adjustable torque fluctuation reduction across a wide rotational speed range, with optional inertia rings and friction reducing members.
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 the peak of torque fluctuations in a predetermined rotational speed range is reduced, but the device requires adjustment of inertia amount and spring constant when engine specifications change, which is difficult to implement
Solution Approach 1:
The patent changes the fundamental parameter from fixed inertia and spring constant to variable centrifugal force generation. The centrifugal element's position changes with rotational speed, automatically adjusting the damping characteristic without requiring physical modification of the device structure. This resolves the contradiction by making the device adaptable to different engine specifications through inherent speed-dependent parameter variation rather than requiring external adjustments.
Solution Approach 2:
The patent introduces a dynamic element (centrifugal element) that moves automatically with rotational speed changes. This dynamic mechanism allows the damper to adapt its characteristics in real-time based on operating conditions, eliminating the need for static adjustments when engine specifications change. The centrifugal element's radial movement creates speed-dependent damping that naturally accommodates different operational ranges.
2Reliability
If traditional dampers with torsion springs are used, then torque fluctuations are inhibited, but the device cannot effectively reduce torque fluctuations across a wide range of rotational speeds
Solution Approach 1:
The patent replaces static torsion springs with a dynamic centrifugal mechanism. The centrifugal element's radial position varies with rotational speed, creating a speed-dependent damping effect. At low speeds, the centrifugal element remains near the center providing one type of damping; at high speeds, it moves outward providing different damping characteristics. This dynamic adaptation enables effective torque fluctuation inhibition across a wide rotational speed range.
Solution Approach 2:
The centrifugal element undergoes periodic radial movement as it responds to torque fluctuations at different rotational speeds. This periodic adjustment of the damping mechanism's effective stiffness allows the system to maintain optimal damping performance across varying speed conditions, effectively addressing the limitation of traditional fixed-characteristic dampers.
3Reliability
If the inertia amount of inertia rings and spring constant of coil springs are changed to adapt to different engine specifications, then torque fluctuation reduction performance is improved, but the device complexity and difficulty of implementation increase
Solution Approach 1:
The centrifugal element automatically adjusts the damping characteristics based on rotational speed without requiring external control or adjustment mechanisms. The system serves itself by using the rotational energy already present in the system to position the centrifugal element, which in turn adjusts the damping force. This self-regulating mechanism eliminates complex adjustment systems while maintaining optimal performance across different engine specifications.
Solution Approach 2:
The patent replaces the mechanical adjustment system (requiring changing inertia rings and spring constants) with a field-based centrifugal force mechanism. Instead of physically reconfiguring the damper for different applications, the system uses the rotational field to automatically adjust its characteristics. This substitution of mechanical adjustment with a physics-based automatic adjustment simplifies the overall device structure.
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 range of rotational speeds by utilizing the cam mechanism to convert centrifugal force, enhancing synchronization and reducing peak fluctuations without significant increases in device size or complexity.
Implementation Method 1
The centrifugal element is disposed to receive a centrifugal force to be generated by rotation of the rotor and the mass body
Data Source
AI summary
A device for inhibiting torque fluctuations includes a mass body disposed in alignment with a rotor in an axial direction. The mass body is rotatable with the rotor, and is also rotatable relatively to the rotor. The device includes a centrifugal element that receives a centrifugal force to be generated by rotation of the rotor and the mass body. A cam mechanism includes a cam and a cam follower. The cam mechanism converts the centrifugal force that acts on the centrifugal element into a circumferential force when a relative displacement is produced between the rotor and the mass body in a rotational direction. The circumferential force is directed to reduce the relative displacement. The cam is provided on the centrifugal element or one of the rotor and the mass body, the cam follower is provided on the one of the rotor and the mass body or the centrifugal element.