Damper Device Void Formation Suppresses Hysteresis Torque
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Solution Overview
Problem
Existing damper devices used in clutch disks experience unintended hysteresis torque due to surface sliding between the flange and seat during rotary vibration absorption, particularly as the rotational speed increases, leading to unpredictable torque behavior.
Innovation Solution
A damper device design featuring a pressing plate, a rotation plate elastically linked by an elastic member, and a pair of seats with projected and recessed surfaces that adjust their contact points based on relative twist, preventing surface sliding by forming a void as the twist angle increases, thereby minimizing hysteresis torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flange is repeatedly pressed to and separated from the seat during rotary vibration absorption, then the damper device can absorb vibrations, but surface sliding is generated between the flange and seat causing unintentional hysteresis torque
Solution Approach 1:
The patent extracts the harmful surface sliding contact by introducing a void between the flange and seat outer diameter side parts. The projected surface and recessed surface are designed to prevent contact at the outer diameter during relative twist, removing the source of hysteresis torque while preserving the vibration absorption function through the elastic member's bending contraction.
2Loss of energy
If the spring bends to absorb rotary vibrations, then vibration buffering is achieved, but surface sliding occurs at the contact interface generating unpredictable torque
Solution Approach 1:
The patent applies local quality by differentiating the contact characteristics at different parts of the seat and flange. The inner diameter side parts maintain contact for structural support, while the outer diameter side parts are designed with a void to prevent sliding contact. This localized differentiation allows vibration buffering through spring bending while eliminating unpredictable torque from surface sliding.
3Stability of the object's composition
If the flange and seat are in full surface contact, then structural stability is maintained, but hysteresis torque increases due to friction during relative motion
Solution Approach 1:
The patent segments the contact interface into two distinct zones: the inner diameter side parts that maintain contact for structural stability, and the outer diameter side parts that are separated by a void to eliminate friction. The projected surface and recessed surface geometry ensures that during relative twist, only the inner diameter portions contact while the outer diameter portions remain separated, thus maintaining stability without hysteresis torque.
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 effectively suppresses the generation of unintentional hysteresis torque by preventing surface sliding between the flange and seat, maintaining predictable torque behavior even at higher rotational speeds.
Implementation Method 1
an elastic member which elastically links the pressing plate and the rotation plate in a circumferential direction, and in which bending is generated in a case where relative twist of the pressing plate and the rotation plate is generated
Implementation Method 2
transmits an input from the plate side to the flanged hub side via the spring while buffering by bending contraction of the spring
Implementation Method 3
surface sliding is generated between the flange and a seat and the surface sliding causes the unintentional hysteresis torque when the flange of the flanged hub is repeatedly pressed to and separated from the seat of an end surface of the spring
Data Source
AI summary
A damper device includes: a pressing plate; a rotation plate disposed to oppose the pressing plate; an elastic member elastically linking the pressing and rotation plates, and in which bending is generated when relative twist of the pressing and rotation plates is generated; and seats provided on both end surfaces of the elastic member The seat has a projected surface, the pressing plate has a recessed surface corresponding to the projected surface, the seats and the pressing plate come into surface-contact with each other in a case where the relative twist is not generated, one seat and the pressing plate come into surface-contact with each other, and a void is formed between the other seat and the pressing plate, in a case where the relative twist is generated, and the void increases as an angle of the relative twist increases.