Torsional Vibration Damper with Nested Coupling for Compact Mass
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing torsional vibration reducing devices face limitations in improving damping performance for low-frequency vibrations due to constraints on the size and number of mass bodies, which restrict the increase in mass without increasing the device's size.
Innovation Solution
The device incorporates a rotating body, an inertial body, and a coupling member that allows for the transmission of torque while restricting rotational movement but allowing radial movement, enabling the inertial body to rotate relative to the rotating body and effectively suppress torsional vibrations through centrifugal force-induced motion, thereby increasing the mass of the inertial body without expanding the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of mass bodies is increased to improve damping performance for low-frequency vibration, then the damping performance is improved, but the device size increases
Solution Approach 1:
The coupling member is disposed inside the inertial body, with the coupling member having a smaller outer diameter than the inner diameter of the inertial body. This nested arrangement allows the coupling mechanism to occupy the internal space of the inertial body rather than requiring additional external space, thereby improving damping performance through proper coupling while maintaining compact device dimensions.
Solution Approach 2:
The invention transitions from a planar arrangement to a three-dimensional spatial utilization by positioning the coupling member axially within the inertial body. The coupling member extends in the axial direction and is radially positioned inside the inertial body, effectively utilizing the vertical and radial dimensions to achieve proper torque transmission and centrifugal force generation without increasing the device's external footprint.
2Weight of moving object
If the size of guide holes is increased to accommodate larger mass bodies, then the mass of mass bodies can be increased, but the spaces between adjacent guide holes become too narrow
Solution Approach 1:
The coupling member is nested within the inertial body, with its outer surface engaging the inner peripheral surface of the inertial body. This nested configuration allows the coupling mechanism to utilize the internal volume of the inertial body, enabling adequate engagement surfaces and centrifugal force generation without requiring large guide hole dimensions or excessive spacing between guide holes.
Solution Approach 2:
The coupling member is designed to dynamically respond to centrifugal forces generated during rotation, with its outer surface pressing against the inner peripheral surface of the inertial body. This dynamic engagement allows effective torque transmission and vibration damping while maintaining a compact configuration with limited guide hole sizes and spacing.
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 configuration enhances the damping performance for low-frequency vibrations by allowing the inertial body to increase its mass without enlarging the device, effectively suppressing torque fluctuations and torsional vibrations.
Implementation Method 1
the inertial body is configured to rotate relative to the rotating body so as to suppress torsional vibration of the rotating body when the torque fluctuates
Implementation Method 2
a coupling member configured to transmit the torque to the rotating body and to the inertial body
Implementation Method 3
the first coupling portion engaging with the coupling member such that the first coupling portion restricts movement of the coupling member in a rotational direction of the rotating body and allows movement of the coupling member in a radial direction
Implementation Method 4
when the rotating body and the inertial body rotate relative to each other, a contact portion of the coupling member with respect to the first coupling portion moves in the radial direction of the rotating body
Data Source
AI summary
A torsional vibration reducing device includes: a rotating body; an inertial body; a coupling member configured to transmit the torque to the rotating body and to the inertial body; and a first coupling portion and a second coupling portion, which are separately provided to either the rotating body or the inertial body. The first coupling portion engages with the coupling member so as to: restrict movement of the coupling member in a rotational direction of the rotating body; and allow movement of the coupling member in a radial direction of the rotating body. The second coupling portion engages with the coupling member such that when the rotating body and the inertial body rotate relative to each other, a contact portion of the coupling member with respect to the first coupling portion moves in the radial direction of the rotating body.