Torsional Vibration Damper Axial Mass Sections
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Solution Overview
Problem
Existing torsional vibration dampers face challenges in increasing inertia moment to improve low-frequency vibration attenuation without increasing the damper's size, as adding more inertia bodies results in a larger damper.
Innovation Solution
A torsional vibration damper design featuring a rotary member with support sections and an inertia body with mass sections and raceway surfaces that allow the rolling member to move radially, increasing the mass on the outer radial direction while reducing surface pressures and enhancing durability, and incorporating aligning sections and lubrication features to minimize resistance and stabilize the rolling motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two inertia bodies are arranged on both sides of the rotating body to increase mass, then attenuation performance of low frequency vibration is improved, but the damper increases in size
Solution Approach 1:
The patent transitions from a conventional design with two separate inertia bodies arranged radially to a single inertia body with mass sections extending in the axial direction. This dimensional change allows the mass to be distributed along the axis rather than requiring radial space, thereby improving low-frequency vibration attenuation without increasing the overall damper size.
Solution Approach 2:
The patent merges the function of two separate inertia bodies into a single inertia body with multiple mass sections. By integrating the mass distribution into one component with axial extensions, the design achieves the same inertial effect without the need for multiple separate bodies, thus avoiding size increase.
2Reliability
If mass of the coupling member is increased to improve attenuation performance, then inertia moment increases, but surface pressure and stress increase reducing durability
Solution Approach 1:
The patent moves the mass distribution from the radial direction to the axial direction through mass sections that extend along the axis. This allows the coupling member to engage with raceway surfaces on the inertia body without requiring excessive radial mass, thereby maintaining lower surface pressures and stresses while still achieving the necessary inertia moment for vibration attenuation.
Solution Approach 2:
The patent concentrates mass in specific axial regions through mass sections rather than uniformly distributing it. This localized mass distribution optimizes the inertia moment while minimizing the contact area and surface pressure between the coupling member and raceway surfaces, thereby improving durability.
3Reliability
If inertia moment is increased to improve low frequency vibration attenuation, then vibration attenuation performance is improved, but the damper size increases
Solution Approach 1:
The patent achieves increased inertia moment by extending mass sections in the axial direction rather than increasing radial dimensions. This allows the inertia body to have sufficient mass for low-frequency vibration attenuation while maintaining a compact radial profile, thus avoiding overall size increase.
Solution Approach 2:
The patent employs a rolling member that can move radially between the rotary member and inertia body, allowing dynamic adjustment of the coupling. This dynamic mechanism enables efficient torque transmission and vibration attenuation with reduced mass requirements compared to rigid coupling designs.
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 design effectively enhances low-frequency vibration attenuation performance by increasing the inertia moment without enlarging the damper, improving strength and durability, and stabilizing the rolling motion to reduce vibration acting on the rotary member.
Implementation Method 1
a rolling member that couples the rotary member and the inertia body in a relatively-rotatable manner
Implementation Method 2
The second coupling section is configured as an arc surface of a certain radius of curvature centered on a place deviating from a rotational center of the rotating body
Data Source
AI summary
A torsional vibration damper includes a rotary member rotated by torque, an inertia body rotated relatively on an outer radial side of the rotary member due to torque pulse, and a rolling member coupled to the rotary member and the inertia body. The rotary member includes support sections that are provided on its outer radial side, and by which the rolling member is restricted in a rotating direction of the rotary member and is engaged movably in a radial direction of the rotary member. The inertia body includes: a pair of mass sections respectively projecting toward both sides in an axial direction; and a pair of raceway surfaces on which the rolling member rolls. A center of curvature of each raceway surface is deviated from a rotational center of the rotary member.