Four-Bearing Assembly Layout for Vehicle Unit Vibration Isolation
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Solution Overview
Problem
Existing bearing assemblies for supporting motor vehicle units on structural components fail to effectively minimize or eliminate the negative acoustic impacts caused by rotational movements, as they are limited by the elasticity of the oscillation-damping elements and relative movement, leading to undesired oscillations and noise.
Innovation Solution
A bearing assembly with four bearings having an elastic center, arranged to span a two-dimensional area with symmetrical axes intersecting at the unit's center of mass, balances rotational forces to cancel out oscillations, ensuring secure support and minimizing acoustic disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the elasticity of the oscillation-damping element is increased to reduce forces from unit rotation, then the damping action improves, but the unit may strike against the vehicle body in an undesired manner
Solution Approach 1:
The bearing assembly is divided into four separate bearings with elastic centers, each independently supporting the unit at different locations. This segmentation allows forces to be distributed and balanced, preventing excessive movement that could cause striking while maintaining vibration isolation.
Solution Approach 2:
The four bearings are arranged symmetrically around the unit's center of mass, creating a balanced support system where the elastic centers form a two-dimensional area containing the center of mass. This symmetric arrangement acts as a counterbalancing mechanism that prevents rotational imbalance and excessive unit movement.
2Reliability
If the elasticity of the oscillation-damping element is limited to prevent unit striking, then unit stability is maintained, but small or damped forces still cause oscillations in the vehicle body resulting in negative acoustics characteristics
Solution Approach 1:
The bearing arrangement creates a symmetric elastic center distribution that is asymmetric relative to the unit's rotation axis. This allows the system to maintain stable support while the symmetric elastic center configuration balances rotational forces, minimizing transmitted vibrations to the vehicle body.
Solution Approach 2:
The elastic centers of the four bearings span a two-dimensional area that contains the unit's center of mass, rather than arranging bearings in a single line. This two-dimensional arrangement provides enhanced stability and force distribution, allowing the unit to be securely supported while rotational forces are balanced in multiple directions.
3Device complexity
If a single oscillation-damping element is used to support the unit, then the structure is simple, but forces from unit rotation cause disturbing oscillations in the vehicle body
Solution Approach 1:
The single oscillation-damping element is segmented into four separate bearings with elastic centers. This segmentation allows the system to handle rotational forces more effectively by distributing the damping action across multiple points, reducing disturbing oscillations while maintaining reasonable structural complexity.
Solution Approach 2:
The bearing configuration transitions from a single-point or linear arrangement to a two-dimensional arrangement where elastic centers span an area containing the center of mass. This dimensional change provides superior force distribution and rotational balance, minimizing acoustic disturbances.
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 bearing assembly securely supports the unit while effectively canceling out oscillations, thereby reducing acoustic disturbances and ensuring consistent acoustic characteristics of the structural component.
Implementation Method 1
The four bearings can be arranged on the structural component or on a subregion of the structural component in such a way that their elastic centers together span a planar or two-dimensional area in which a center of mass or a mass center point of the unit to be supported is located
Data Source
AI summary
A bearing assembly for supporting a unit of a motor vehicle on a structural component of the motor vehicle includes four bearings with an elastic center. The four bearings are arranged on the structural component of the motor vehicle such that the elastic centers of the bearings together define a two-dimensional surface on which the center of mass of the unit to be supported is located.