Dual-Mass Flywheel Structure With Pendulum Vibration Damping
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Solution Overview
Problem
Dual-mass flywheels used in vehicle drive trains face increased vibration amplitudes and noise issues when the engine is started or stopped, leading to higher component loads, due to natural frequencies below idling speed, which existing designs fail to adequately address without increasing complexity and cost.
Innovation Solution
A space-optimized dual-mass flywheel design featuring a one-piece secondary part with arc springs, a thin-walled metal sheet cover, and a centrifugal pendulum, which reduces installation space and component count, while maintaining operational reliability through a combined friction and centering device, and uses a disk spring arrangement for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional multi-part secondary part design is used with separate arc spring flanges, then the structural integrity and reliability are maintained, but the installation space and manufacturing complexity increase
Solution Approach 1:
The patent combines multiple separate components (secondary part, arc spring flanges, output hub) into a single integrated one-piece secondary part. This merging eliminates the need for separate arc spring flanges and reduces the number of joining operations (rivet connections), directly reducing axial installation space by 10-20% while simplifying the overall device structure and reducing component count.
2Volume of moving object
If a solid thick-walled lid is used to cover the end face, then the structural strength and protection are improved, but the installation space and weight increase
Solution Approach 1:
The patent replaces the traditional solid thick-walled lid with a thin-walled sheet metal cover that is bonded to the primary part. This thin-walled construction significantly reduces axial installation space and weight while maintaining adequate protective function. The sheet metal cover provides sufficient structural strength for the application while achieving the space optimization goal.
3Ease of manufacture
If separate arc spring flanges are joined to the output hub using rivet connections, then the structural reliability is maintained, but the manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent integrates the arc spring flanges directly into the one-piece secondary part, eliminating the need for separate rivet connections between flanges and output hub. This integration simplifies manufacturing by reducing the number of joining operations and associated costs, while simultaneously improving reliability by eliminating potential failure points from multiple connection interfaces.
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 design achieves a 10-20% reduction in axial installation space, weight reduction, and simplified assembly, resulting in a cost-effective, compact dual-mass flywheel with enhanced operational reliability and low-noise performance.
Implementation Method 1
a spring damper arrangement including arc springs acting between the primary part and the secondary part
Implementation Method 2
a friction device with at least one spring-loaded friction ring
Implementation Method 3
a centrifugal pendulum associated with the secondary part
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a dual mass flywheel (1) comprising a primary part (2) and a secondary part (3) that can be rotated together in relation to each other about an axis of rotation (5) in a restricted manner. A spring damper arrangement (4) including a torsion spring (14) and a friction device (20) are provided between the primary part (2) and the secondary part (3). The secondary part (3) embodied as a single component forms outer flange sections (13) that cooperate with the torsion springs (14), as well as an output hub (11). A holding element (16, 33) used to centre (15) the secondary part (3) is arranged on the primary part (2). The dual mass flywheel (1) is covered by a metal sheet (9) on the output side.