Pre-Damper Hub-Flange Structure for Torsional Noise Control
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Solution Overview
Problem
The existing damper devices with pre-damper units suffer from noise production due to wobble in the rotational direction, caused by the relationship between the length of coil springs and gaps between the hub and flange components.
Innovation Solution
The damper device incorporates a first pre-damper and a first main elastic member, with subordinate elastic members that compress differently to maintain constant intervals between the hub and flange, preventing noise by actuating in specific torsion angles and utilizing a stopper mechanism to restrict relative rotation within a predetermined range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gaps are produced between the hub and flange to enable relative rotation, then the hub and flange can rotate relative to each other by an angle corresponding to the gaps, but noise is produced due to wobble in the rotational direction
Solution Approach 1:
The subordinate elastic members are pre-compressed in the neutral state to urge the flange to different sides in the rotational direction, creating preliminary counteracting forces that prevent wobble and noise during rotation. This preliminary action eliminates the harmful effect before it occurs.
Solution Approach 2:
The subordinate elastic members act as cushioning elements that are compressed beforehand to maintain constant intervals between the hub and flange. This beforehand cushioning prevents direct contact and collision that would cause noise during relative rotation.
2Device complexity
If a single elastic member is used in the pre-damper unit, then the structure is simpler, but noise is produced due to wobble from the relationship between spring length and gaps
Solution Approach 1:
The pre-damper unit is segmented into multiple subordinate elastic members (first and second subordinate elastic members) that are disposed at different positions. Each member independently urges the flange to different sides, working together to eliminate wobble and noise while maintaining structural efficiency.
3Strength
If the first subordinate elastic member is further compressed when the hub is rotated to the first side, then the elastic coupling is maintained, but the second subordinate elastic member is further compressed when the hub is rotated to the second side
Solution Approach 1:
The first and second subordinate elastic members are positioned asymmetrically to urge the flange to different sides in the rotational direction. This asymmetric arrangement allows each member to be further compressed when the hub rotates to its respective side, providing balanced elastic coupling in both rotational directions.
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 configuration effectively inhibits noise production during idling and other operations by maintaining constant intervals and controlling torsion angles, enhancing the structural integrity and reducing noise-related issues.
Implementation Method 1
The first pre-damper elastically couples the hub and the flange in a rotational direction... the first subordinate elastic member is disposed in compression in a neutral state without relative rotation between the hub and the flange and urges the flange to a first side in the rotational direction with respect to the hub
Implementation Method 2
the first main elastic member is disposed in a different position from the first pre-damper in a circumferential direction, elastically couples the first rotor and the second rotor in the rotational direction
Implementation Method 3
a stopper mechanism restricting an angle of relative rotation between the first rotor and the second rotor to a predetermined angular range
Data Source
AI summary
A damper device includes first and second rotors, a first pre-damper, and a first main elastic member. The second rotor includes a hub and a flange. The first pre-damper elastically couples the hub and the flange in a rotational direction, and is actuated in a first range of torsion angle between the first and second rotors. The first main elastic member elastically couples the first and second rotors in the rotational direction, and is actuated in a greater second range of torsion angle. The first pre-damper includes first and second subordinate elastic members. The first subordinate elastic member is compressed in a neutral state, and urges the flange to a first side in the rotational direction with respect to the hub. The second subordinate elastic member is compressed in the neutral state, and urges the flange to a second side in the rotational direction with respect to the hub.