Flywheel Assembly Dual Spring Series Vibration Damping
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Solution Overview
Problem
The vibration damping performance of flywheel assemblies declines at high rotational speeds due to increased centrifugal forces inhibiting the movement of spring seats, leading to higher friction and reduced effectiveness of the damper mechanism.
Innovation Solution
A flywheel assembly design featuring a first elastic member with higher stiffness and a second elastic member with lower stiffness, arranged in series, where the second elastic member compresses when centrifugal forces are high, maintaining effective vibration damping by preventing excessive torsional stiffness when only the second elastic member is compressed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coil springs are arranged in series between the first flywheel and the second flywheel to provide vibration damping, then the vibration damping performance is improved, but the torsional stiffness becomes excessively large when only one spring compresses at high rotational speeds
Solution Approach 1:
The patent applies parameter changes by configuring the second coil spring with different physical parameters (lower stiffness, different wire diameter or coil spacing) compared to the first coil spring. This allows the second spring to compress more easily under centrifugal force, maintaining appropriate torsional stiffness while preserving vibration damping performance through the series arrangement of both springs.
2Device complexity
If the spring seats are pushed radially outward against the first flywheel to support the coil springs, then the spring support structure is simplified, but the friction force becomes extremely large at high rotational speeds preventing spring seat movement
Solution Approach 1:
The patent introduces an intermediary mechanism by allowing the second coil spring to compress between the second flywheel and the first spring seat when centrifugal force is high. This compressive action of the second spring serves as a mediator that enables the first spring seat to move rotationally relative to the first flywheel despite large friction forces, thereby maintaining the simplicity of the support structure while overcoming the friction barrier.
3Reliability
If only the first coil spring compresses during rotation, then the vibration damping is effective, but at high speeds the centrifugal force prevents spring seat movement and inhibits compression
Solution Approach 1:
The patent applies dynamics by creating a dynamic compression system where either the first or second coil spring can compress depending on the rotational speed and centrifugal force conditions. The second coil spring is designed with lower stiffness to become the active compressing element at high speeds, while the first spring handles lower speed operations, ensuring continuous effective vibration damping across the full operational speed range.
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 prevents a decline in vibration damping performance at high rotational speeds by ensuring the second elastic member compresses instead of the first, maintaining effective damping and reducing torsional stiffness when movement is restricted.
Implementation Method 1
The first elastic member elastically connects the first rotary member and the second rotary member in a rotational direction
Implementation Method 2
the centrifugal force acting on the coil springs and the spring seats increases
Data Source
AI summary
A first flywheel assembly a first flywheel, a second flywheel, a first spring set, a first spring seat, and a second spring set. The first spring set is arranged between the first flywheel and the second flywheel in a pre-compressed state. The first spring seat is a member that supports an end portion of the first spring set and is pushed in a radially outward direction against the first flywheel. The second spring set is a member having a lower stiffness than a stiffness of the first spring set and is arranged between the second flywheel and the first spring set in a pre-compressed state such that it acts in series with the first spring set.