Rolling Inertial Damper for Torque Fluctuation Vibration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing torque fluctuation suppressing apparatuses face challenges in achieving effective vibration damping due to increased friction forces caused by large or small clearances between the centrifugal element and the rotator, leading to unstable behavior and inadequate damping performance.
Innovation Solution
A vibration damping apparatus featuring a support member with a restoration force generating member and an inertial mass, utilizing guide surfaces and a coupling member with rolling portions to reduce friction and enhance the degree of freedom in shape change, allowing the restoration force generating member and inertial mass to swing relative to the rotation center, thereby applying an inertial torque opposite to the fluctuation torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a large clearance is provided between the recess of the rotator and the centrifugal element, then the centrifugal element can move freely, but the centrifugal element rattles in the clearance causing increased friction force
Solution Approach 1:
A guide member is introduced as an intermediary component between the centrifugal element and the rotator. The guide member includes a guide surface that contacts the centrifugal element, providing guidance and restricting rattling motion while allowing the necessary centrifugal movement. This mediator eliminates the harmful clearance rattling while preserving the functional movement.
2Stability of the object's composition
If the centrifugal element is constrained tightly in the recess of the rotator, then stability is improved, but the centrifugal element cannot swing relative to the rotator reducing vibration damping effect
Solution Approach 1:
The guide surface of the guide member is designed to allow dynamic movement of the centrifugal element in the radial direction while maintaining positional stability. The guide surface geometry enables the centrifugal element to swing relative to the rotator during operation, providing the necessary degrees of freedom for vibration damping while preventing unwanted rattling.
3Ease of operation
If a roller or projection is used as the cam follower, then the cam mechanism can function, but the centrifugal element becomes unstable and tilts when protruding from the recess
Solution Approach 1:
The guide member acts as an intermediary that replaces the traditional roller or projection cam follower. The guide surface of the guide member provides stable support for the centrifugal element throughout its movement range, preventing tilting and instability while still enabling the cam mechanism to function properly by converting centrifugal force into circumferential force.
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 reduces frictional influence on damping performance and improves vibration damping by allowing the inertial mass to swing in conjunction with the restoration force generating member, effectively damping rotational element vibrations regardless of rotation speed.
Implementation Method 1
a coupling member having a first rolling portion and a second rolling portion integrated together and arranged so that the first rolling portion rolls along the first guide surface and the second rolling portion rolls along the second guide surface
Implementation Method 2
By coupling the restoration force generating member and the inertial mass by the coupling member that rolls along the first and second guide surfaces, friction to be caused between the restoration force generating member (first guide surface) and the coupling member (first rolling portion) and between the inertial mass (second guide surface) and the coupling member (second rolling portion) is reduced
Implementation Method 3
an inertial mass coupled to the support member via the restoration force generating member and configured to swing about the rotation center in conjunction with the restoration force generating member along with the rotation of the support member
Implementation Method 4
When the support member rotates, a component force of a centrifugal force acting on the restoration force generating member is transferred from the first guide surface to the second guide surface via the coupling member
Data Source
AI summary
A vibration damping apparatus including a support member rotatable together with a rotational element, a restoration force generating member coupled to the support member to transmit and receive a torque with the support member, an inertial mass coupled to the support member via the restoration force generating member, a first guide surface on the restoration force generating member, a second guide surface on the inertial mass, and a coupling member having first and second rolling portions. The first and second guide surfaces are formed so that the first rolling portion rolls along the first guide surface and the second rolling portion rolls along the second guide surface along with rotation of the support member causing the restoration force generating member to swing about a rotation center of the rotational element along a radial direction of the support member and causing the inertial mass to swing about the rotation center.