Dual-Mass Flywheel Centrifugal Pendulum Welded Connection
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Solution Overview
Problem
Existing torsional vibration dampers face limitations in expanding usable space, requiring rivet connections, and optimizing the effectiveness of centrifugal pendulum devices, particularly in reducing torsional vibrations in motor vehicle powertrains.
Innovation Solution
A dual-mass flywheel design with a centrifugal pendulum device arranged radially outside the spring device, where the pendulum mass carrier part is connected to the output part using a radial weld seam, allowing for increased mass and movement space for pendulum masses, and eliminating rivet connections, thereby enhancing the effectiveness of the torsional vibration damper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the centrifugal pendulum device is arranged radially outside the energy storage device, then the installation space is improved, but the connection complexity increases due to rivet fasteners
Solution Approach 1:
The patent extracts the rivet fasteners from the connection system and replaces them with a welded connection between the support flange and the platen. This eliminates the complexity of rivet installation while maintaining the radial arrangement of the centrifugal pendulum device outside the energy storage device, thus preserving the improved installation space.
Solution Approach 2:
The patent replaces the mechanical rivet connection system with a welding process. The support flange is welded to the platen, creating a permanent structural connection that eliminates the need for rivet fasteners. This substitution reduces connection complexity while maintaining the beneficial radial arrangement for space optimization.
2Quantity of substance
If the pendulum mass carrier part is arranged on the output part with rivet fasteners, then the connection is established, but the mass of pendulum masses and movement space is limited
Solution Approach 1:
The patent removes rivet fasteners from the connection method and replaces them with welding. This allows for a more robust connection that can support larger pendulum masses and provides more movement space, as the welded connection between the support flange and platen creates a stronger structural foundation for the pendulum mass carrier part.
Solution Approach 2:
The patent transitions from a mechanical fastening approach to a thermal joining approach (welding). This dimensional change in the manufacturing process enables larger pendulum masses and greater movement space while simplifying the overall connection methodology through a permanent structural bond.
3Reliability
If rivet connections are used to attach the support flange to the platen, then the assembly is secured, but the manufacturing complexity and assembly time increase
Solution Approach 1:
The patent replaces the mechanical rivet connection system with welding, which creates a permanent structural bond between the support flange and the platen. This substitution maintains assembly security while significantly reducing assembly time, as welding eliminates the multiple steps of rivet installation and securing required in traditional mechanical fastening systems.
4Area of stationary object
If the centrifugal pendulum device is arranged in a grease-free space with sheet metal parts, then the space utilization is improved, but the connection strength may be compromised
Solution Approach 1:
The patent replaces mechanical rivet connections with welding to maintain connection strength in the grease-free space environment. The welded connection between the support flange and platen provides robust structural integrity while preserving the space utilization benefits of the radial arrangement and sheet metal construction.
Solution Approach 2:
The patent employs sheet metal parts for the support flange and platen, creating a lightweight yet strong structure. The welded connection creates a composite structural system that maintains high connection strength while optimizing space utilization in the grease-free environment.
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 solution expands installation space, increases the mass moment of inertia, and improves the effectiveness of the centrifugal pendulum device, leading to enhanced torsional vibration reduction in motor vehicle powertrains by allowing a more efficient use of space and improved connection methods.
Implementation Method 1
a spring-damper device effective between the input part and the output part with a spring device
Implementation Method 2
a centrifugal pendulum device with a pendulum mass carrier part and at least one pendulum mass arranged displaceably on the pendulum mass carrier part under the action of centrifugal force
Data Source
Figure 1
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Figure 4
AI summary
The invention relates to a torsional vibration damper (400), in particular a dual-mass flywheel, having an input part and an output part with a common rotational axis, about which the input part and the output part can be rotated together and relative to each other to a limited degree, and a spring damper device, which acts between the input part and the output part and which comprises a spring device and a centrifugal force pendulum device with a pendulum mass support part (402) and at least one pendulum mass arranged on the pendulum mass support part (402) so as to be movable under the effect of centrifugal force. The pendulum mass support part is arranged on the output part, and the centrifugal force pendulum device is arranged radially outside of the spring device, wherein a connection between the pendulum mass support part (402) and the output part (404) is arranged radially outside of the at least one pendulum mass in order to improve the design and/or function of the torsional vibration damper.