Loosely Fitted Roller Vibration Absorber for Low-Speed Noise
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Solution Overview
Problem
Existing dynamic vibration absorbers for power transmission systems in automobiles are complex and costly to manufacture, and they generate noise due to collisions when the rotational speed is low, as they require precise machining and complex structures to restrict the movement of rolling elements.
Innovation Solution
A dynamic vibration absorber with a disk-like main body, loosely fitted rollers, and annular guide plates that absorb torsional vibrations by centrifugal force, where the rollers are supported by guide plates and separate from the outer rim at reduced rotational speeds, preventing collisions and noise through elastic rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If guide grooves are formed in rolling element chambers to restrict rolling element movement, then collision noise is reduced, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The invention extracts the noise-reduction function from the rolling element chamber walls and transfers it to separate guide plates. Instead of forming guide grooves directly in the chambers (which complicates the chamber structure), the guide plates are mounted independently on the chamber walls to perform the guiding and noise-reduction function. This separation simplifies the overall manufacturing process while maintaining the noise-reduction effect.
Solution Approach 2:
The guide plates act as intermediary components between the rolling elements and the rolling element chambers. These plates provide the guiding surfaces and collision-dampening functions without requiring direct integration into the chamber structure. The intermediary plates simplify manufacturing by allowing independent production and assembly of components.
2Reliability
If guide grooves are precisely machined to enable smooth rolling, then vibration absorption efficiency improves, but manufacturing cost and time increase
Solution Approach 1:
The invention segments the vibration absorption system into distinct functional components: rolling elements, guide plates, and rolling element chambers. Each component can be manufactured independently with standard tolerances, avoiding the need for highly precise machining of integrated guide grooves. The guide plates provide the necessary guidance without requiring complex precision machining in the chambers themselves.
3Stability of the object's composition
If stopper protrusions are added to rolling elements to restrict movement, then path control improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts the path control function from the rolling elements themselves and transfers it to the guide plates. Instead of modifying the rolling elements with stopper protrusions (which complicates the rolling element design), the guide plates provide the constraining surfaces that define the rolling path. This keeps the rolling elements simple while achieving the desired path control.
4Reliability
If multiple rolling element chambers with guide grooves are formed, then vibration absorption performance improves, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The invention segments the vibration absorption system into multiple independent rolling element chambers, each equipped with simple guide plates rather than complex integrated guide grooves. This segmentation allows each chamber to be manufactured separately with standard machining processes, and the guide plates can be added as simple mounted components. The result is a system that achieves good vibration absorption performance through multiple chambers while maintaining manufacturing simplicity.
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 solution reduces manufacturing costs, simplifies the structure, and effectively absorbs torsional vibrations with minimal noise by allowing rollers to adjust their position based on rotational speed changes, enhancing vibration absorption capacity and reducing noise.
Implementation Method 1
A dynamic vibration absorber with a disk-like main body, loosely fitted rollers, and annular guide plates that absorb torsional vibrations by centrifugal force
Implementation Method 2
the rolling elements that resonate with a predetermined order of the torsional vibration of the power transmission system roll in the rolling element chambers. Accordingly, a dynamic vibration absorbing operation is performed, and torsional vibration is absorbed
Data Source
AI summary
Rolling element bores are provided in the outer circumferential portion of a disk-like main body. Each rolling element bore has an arcuate outer rim. Rollers each have a groove formed on the peripheral edge and extending along the entire circumference of the roller. The outer rim of each rolling element bore engages with the groove of the associated roller so that the roller is loosely fitted in the rolling element bore. Shafts are respectively formed on both sides of each roller. The shafts project from the center of the roller. An elastic ring is mounted on each shaft. Annular guide plates are respectively mounted on both sides of the disk-like main body so that the shafts of the rollers are supported by the guide plates.