Centrifugal Pendulum Rolling Element Diameter Variation
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Solution Overview
Problem
Existing centrifugal pendulum devices in motor vehicle drive trains face challenges in efficiently guiding pendulum masses and managing manufacturing costs, particularly in reducing the complexity and cost of rolling elements.
Innovation Solution
A centrifugal pendulum device design featuring pendulum masses on both sides of a rotatable support, connected by a fastener and utilizing a rolling element with varying diameters to allow limited pivoting, along with a spacer element to maintain axial distance, is proposed. The rolling element has a first section with a larger diameter, a second section with a smaller diameter, and a third section with a diameter smaller than or equal to the first, enhancing guidance while reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rolling element with uniform diameter is used to guide the pendulum mass, then the structure is simple and manufacturing is easy, but the guidance precision and vibration damping effectiveness are insufficient
Solution Approach 1:
The rolling element employs varying diameters in different axial sections (first section with larger diameter, second section with smaller diameter, third section with intermediate diameter) to provide optimized local contact characteristics. This local quality variation improves guidance precision and vibration damping effectiveness while maintaining overall structural simplicity
Solution Approach 2:
The rolling element's geometric parameter (diameter) is changed along its axial length to create sections with different diameters. This parameter variation allows the rolling element to adapt to different functional requirements in different zones, improving guidance precision without significantly increasing manufacturing complexity
2Reliability
If a collar is added to the rolling element to prevent contact between pendulum mass and support, then contact prevention is achieved, but manufacturing costs and structural complexity increase
Solution Approach 1:
The contact prevention function is merged into the rolling element's own structure through the third section with intermediate diameter, rather than adding a separate collar component. This integration maintains reliability by preventing pendulum mass contact with the support while reducing manufacturing costs by eliminating the need for additional parts
Solution Approach 2:
The traditional separate collar component is extracted and its function is integrated into the rolling element itself. The third section of the rolling element assumes the contact prevention role that would otherwise require a separate collar, simplifying the overall structure and reducing manufacturing complexity
3Ease of manufacture
If the third section diameter is made equal to the first section diameter, then manufacturing is simplified, but guidance effectiveness may be reduced
Solution Approach 1:
The third section's diameter is optimized to be smaller than or equal to the first section's diameter, creating a progressive diameter reduction pattern. This parameter configuration balances manufacturing simplicity with guidance effectiveness, allowing the rolling element to maintain proper contact geometry while facilitating easier production
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 improves the guidance of pendulum masses while lowering manufacturing costs, effectively integrating with torsional vibration dampers and other components like hydrodynamic torque converters and dual-mass flywheels, enhancing vibration damping capabilities.
Implementation Method 1
a rolling element arranged to roll in a recess formed in the pendulum mass support and in the pendulum mass to allow the pendulum mass pair to pivot to a limited extent relative to the pendulum mass support
Implementation Method 2
centrifugal pendulum device for further damping and/or absorption of the torsional vibrations in the drive train
Implementation Method 3
at least one pendulum mass pair arranged thereon. The pendulum mass pair consists of two pendulum masses arranged opposite each other
Data Source
AI summary
Centrifugal pendulum device including pendulum masses arranged on axial sides of a pendulum mass support rotatable about an axis of rotation to form a pendulum mass pair. To form the mass pair, the masses are fastened to each other by means of a fastener passing through a cutout in the mass support. The mass pair is pivotable relative to the mass support due to a rolling element arranged to roll in a recess of the mass support and of the mass. In a section axially covering the recess of the mass support, the rolling element has a first outer diameter. In a section axially covering the recess of the pendulum mass, the rolling element has a second outer diameter. The rolling element further comprises a section axially located between the first and second diameters and has a third diameter, which is smaller than or equal to the first outer diameter.