Differential-Adjacent Centrifugal Pendulum for Drivetrain Eigenmode Damping
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Solution Overview
Problem
Existing drive trains with internal combustion engines suffer from insufficient torsional vibration isolation, leading to residual eigenmodes at the differential that are not adequately damped by traditional torsional vibration isolation devices between the engine and transmission.
Innovation Solution
A centrifugal pendulum is strategically placed adjacent to the differential to effectively isolate these eigenmodes, complementing existing torsional vibration isolation devices between the internal combustion engine and transmission, and is designed to adapt to the speed amplitudes of the differential, using a pendulum mass carrier with distributed pendulum masses and complementary raceways to cancel out torsional vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional torsional vibration isolation devices are arranged between the internal combustion engine and transmission, then primary torsional vibrations are damped, but eigenmodes at the differential remain insufficiently isolated
Solution Approach 1:
The vibration isolation system is segmented into two distinct parts: traditional torsional vibration isolation devices between engine and transmission for primary vibrations, and a centrifugal pendulum adjacent to the differential for eigenmode isolation. This segmentation allows each component to address specific vibration sources effectively.
Solution Approach 2:
A centrifugal pendulum is introduced as an intermediary element between the transmission output shaft and the differential. This intermediary device specifically targets and damps eigenmodes at the differential without interfering with the primary torsional vibration isolation already in place.
2Reliability
If a centrifugal pendulum is placed adjacent to the differential, then eigenmodes at the differential are effectively isolated, but device complexity increases
Solution Approach 1:
The centrifugal pendulum is merged with the existing transmission and differential assembly. The pendulum is integrated into the drive train structure, utilizing existing mounting points and spatial arrangements, thereby reducing the increase in device complexity while achieving effective eigenmode isolation.
3Reliability
If centrifugal pendulum is used to damp eigenmodes, then vibration isolation is improved, but manufacturing complexity increases
Solution Approach 1:
The centrifugal pendulum is designed with universal applicability to different differential configurations. The pendulum mechanism uses standard components and mounting methods that can be adapted to various drive train layouts, simplifying manufacturing and assembly processes while maintaining effective vibration damping performance.
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 placement of a centrifugal pendulum near the differential enhances torsional vibration isolation, effectively damping eigenmodes at the differential without disrupting existing isolation methods, improving overall vibration damping and adapting to driving conditions.
Implementation Method 1
a centrifugal pendulum is assigned adjacent to the differential
Implementation Method 2
pendulum masses which can be pivoted along a predetermined pendulum path
Data Source
AI summary
The disclosure relates to a drive train for a motor vehicle containing an internal combustion engine, a transmission connected downstream thereof, drive wheels and a differential arranged between the drive wheels and the transmission. In order to eliminate or at least reduce the vibrational eigenmodes behind the transmission, a centrifugal pendulum is assigned adjacent to the differential.