Vehicle Roll Rod Attenuation Unit for NVH
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional roll rod devices for vehicles fail to effectively restrain front and rear rubbers within the body bracket, leading to increased spring characteristics and deteriorated NVH performance due to compression during forward and reverse shifting and acceleration/deceleration, which results in inadequate vibration, noise, and impact force reduction.
Innovation Solution
A roll rod device with a cylindrical housing, a slidably coupled roll rod, and an attenuation unit comprising a main rubber, latching part, stopper ring, and stopper rubbers, which are integrated and adhered/molded to prevent vibration and impact transmission by allowing free movement at low displacement and acting as an insulator at higher displacement, thereby enhancing NVH performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the front and rear rubbers are compressed by a predetermined length when the vehicle stops, then the impact during forward and reverse shifting and acceleration/deceleration is prevented, but the spring characteristic increases which reduces the insulation ratio of the rubbers, thereby deteriorating the overall NVH performance
Solution Approach 1:
The attenuation unit is divided into multiple functional components: a main rubber for vibration attenuation, a latching part for securing, a stopper ring for positioning, and stopper rubbers for limiting movement. This segmentation allows each component to perform its specific function optimally - the main rubber provides insulation while the stopper components prevent excessive compression that would increase spring characteristics
Solution Approach 2:
The attenuation unit acts as an intermediary component between the roll rod and the housing, absorbing impact forces and vibrations before they can be transmitted to the vehicle body. The stopper rubbers serve as intermediaries that limit the compression distance of the main rubber, preventing it from being compressed too much while still allowing sufficient movement for vibration isolation
2Object-affected harmful factors
If the front and rear rubbers are not restrained inside the body bracket, then the insulation ratio is maintained, but the impact causes during forward and reverse shifting and acceleration/deceleration
Solution Approach 1:
The stopper ring and stopper rubbers are pre-positioned within the housing to establish predetermined stop points for the roll rod movement. These components provide beforehand cushioning by limiting the maximum compression distance of the main rubber, ensuring that impact forces are absorbed within safe boundaries before they can cause damage or excessive spring characteristics
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 device efficiently attenuates vibrations, noise, and impact forces by preventing their transmission to the vehicle body during idling and driving, improving overall NVH performance by utilizing the attenuation unit's insulating and absorbing functions.
Implementation Method 1
an attenuation unit mounted to one end of the roll rod and attenuating a vibration and an impact force while being slid and moved, or being compressed and tensioned in an axis direction of the roll rod inside the housing
Implementation Method 2
a stopper ring mounted inside the housing; and a pair of stopper rubbers mounted to an interior circumference of the housing
Data Source
AI summary
A roll rod device for a vehicle includes a mounting flange mounted to a vehicle body; a housing of a cylindrical shape integrally formed at the mounting flange; a roll rod having a first end coupled to the housing to be slid and moved and a second end on which a bush unit is mounted; and an attenuation unit mounted to the first end of the roll rod and attenuating a vibration and an impact force while being slid and moved, or being compressed and tensioned in an axis direction of the roll rod inside the housing.