Asymmetric Drive Unit Mounting for EV Vibration Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional three-point mountings for drive units in electrical vehicles achieve low damping, leading to increased vibrations and comfort losses, while four-point mountings require material-intensive reinforcements that increase weight.
Innovation Solution
The drive unit is supported via asymmetrical unit bearings arranged on an auxiliary frame with crossbeams, allowing for a four-point mounting that distributes weight more evenly and avoids material-intensive reinforcements, using bearing receptacles on the frame to achieve better damping and comfort without weight increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-point mounting is used for the drive unit, then the structure is simpler and weight is reduced, but the damping level is low resulting in increased vibrations
Solution Approach 1:
The mounting structure is segmented into multiple bearing points (front left, front right, rear left, rear right) distributed across the auxiliary frame. This segmentation allows the mounting system to achieve better damping through increased contact points while maintaining structural simplicity, as each bearing point independently handles localized vibration forces.
Solution Approach 2:
The unit bearings are arranged asymmetrically on the auxiliary frame rather than in a symmetric pattern. The first and second unit bearings are positioned at different locations and orientations on the crossbeam, optimized for their specific attachment points on the drive unit. This asymmetric arrangement allows each bearing to be optimally positioned for its function without requiring symmetric reinforcement structures.
2Object-generated harmful factors
If a four-point mounting is used for the drive unit, then the damping level is higher and comfort is improved, but material-intensive reinforcements are required increasing weight
Solution Approach 1:
Each unit bearing is locally optimized for its specific position and function on the auxiliary frame. The first unit bearing supports the transmission housing attachment point while the second unit bearing supports the motor housing attachment point. Each bearing's position, orientation, and support structure are tailored to its local requirements, avoiding the need for uniform material-intensive reinforcements across the entire structure.
Solution Approach 2:
The mounting system utilizes three-dimensional spatial arrangement of the unit bearings on the auxiliary frame. The bearings are positioned at different heights, longitudinal positions, and transverse positions, creating a distributed support system that achieves high damping through spatial distribution rather than through increased material thickness or reinforcement.
3Adaptability or versatility
If the fourth attachment point is reinforced via a longer unit-side support, then the four-point mounting can be achieved, but the weight increases
Solution Approach 1:
The auxiliary frame with its crossbeam structure serves multiple functions simultaneously: it provides structural support, positions all four unit bearings, and distributes loads across the drive unit. The frame's longitudinal girders and crossbeams work together to provide both structural integrity and bearing support, eliminating the need for separate longer support structures.
Solution Approach 2:
The mounting system merges the auxiliary frame structure with the bearing support function. The crossbeam and longitudinal girders are integrated into a single auxiliary frame assembly that simultaneously provides structural support and houses all unit bearings. This merging eliminates redundant support structures and reduces overall weight while maintaining four-point mounting capabilities.
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 design achieves higher damping and comfort by distributing the weight more evenly and allowing the use of softer bearings, reducing vibrations and structure-borne noise, while maintaining a lightweight structure.
Implementation Method 1
the drive unit is supported via damping unit bearings on the auxiliary frame with unit supports interconnected
Data Source
AI summary
A unit mounting for a drive unit of an electrical motor vehicle, including at least one first unit bearing and one second unit bearing which are arranged spaced apart from one another in the vehicle transverse direction on an auxiliary frame. The unit bearings each support the drive unit via a unit support. The first unit bearing and the second unit bearing are arranged asymmetrically in relation to one another on a crossbeam of the auxiliary frame.