Torsional Vibration Attenuation via Cam-Driven Nonlinear Spring
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Solution Overview
Problem
Conventional torsional vibration attenuation apparatuses face challenges in widening the torsion angle and achieving non-linear torsional properties to effectively suppress abnormal noises and torque fluctuations, leading to issues with rattling, chinking, and muffled noises.
Innovation Solution
The apparatus incorporates a cam member with a curvature varying torsion angle and arm members that slide along the cam surface through roller elements, allowing for increased resilient deformation and reduced contact pressure, enabling a non-linear torsional property and torque limiting functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional coil springs are used to connect driving and driven rotation members, then the structure is simple, but the torsion angle range is limited and abnormal noises cannot be effectively suppressed
Solution Approach 1:
The resilient member is divided into multiple stages with different spring constants. The first resilient member has a first spring constant for small torsion angles, and the second resilient member has a second spring constant for large torsion angles. This segmentation allows the system to adapt to different operating conditions while maintaining a relatively simple overall structure.
Solution Approach 2:
The invention changes the spring constant parameter based on the torsion angle. By using resilient members with different spring constants in series, the system transitions from a high spring constant state (small torsion angle) to a low spring constant state (large torsion angle), expanding the effective torsion angle range while managing structural complexity.
2Object-affected harmful factors
If multi-stage resilient members are used to suppress abnormal noises, then the torsional property is improved, but the device complexity increases
Solution Approach 1:
The resilient connection is segmented into multiple stages with different spring constants. The first stage handles small torsion angles with a higher spring constant, while the second stage handles large torsion angles with a lower spring constant. This segmentation effectively suppresses abnormal noises by providing appropriate stiffness for each operating condition.
Solution Approach 2:
The system dynamically transitions between different spring constant stages based on the torsion angle. As the torsion angle increases, the system automatically engages the second resilient member with the lower spring constant, providing adaptive noise suppression without requiring complex active control mechanisms.
3Adaptability or versatility
If the torsional rigidity is reduced to widen torsion angle, then the torsional vibration attenuation is improved, but the torque transmission capability is weakened
Solution Approach 1:
The spring constant parameter is changed based on the operating condition. For small torsion angles, a higher spring constant maintains good torque transmission capability. For large torsion angles, a lower spring constant allows wider torsion angle range while still providing adequate torque transmission through the series connection of resilient members.
Solution Approach 2:
The torque transmission path is segmented into multiple resilient members in series. Each member is optimized for a specific torsion angle range, allowing the system to maintain torque transmission capability across a wide overall torsion angle range by combining the strengths of each segment.
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 widens the torsion angle range, reduces torsional rigidity, and effectively suppresses abnormal noises and torque fluctuations, preventing excessive torque transmission and protecting transmission gear sets.
Implementation Method 1
one or more resilient members disposed between the driving rotation member and the driven rotation member to be resiliently deformed in the circumferential direction of the driving rotation member when the driving rotation member and the driven rotation member are relatively rotated with each other
Implementation Method 2
one or more arm members each having one end portion held in contact with the cam surface of the cam member and the other end portion held in engagement with the circumferential end portion of the resilient member, and the cam member and the one end portion of the arm member having respective sliding surfaces between which a roller element is provided
Data Source
AI summary
A torsional vibration attenuation apparatus includes a driving rotation member and a driven rotation member which can be twisted in an enlarged torsion angle range with a non-linear torsional property, thereby preventing an excessively large torque from being transmitted from driving member to the driven member. The torsional vibration attenuation apparatus includes a boss, a cam member having a cam surface formed in an elliptical shape and provided on the outer peripheral portion of the boss to be integrally rotated with the boss, and a pair of arm members each provided between the cam member and a coil spring and having one end held in contact with the can surface and the other end held in engagement with a spring seat of the coil spring.