Spring Seat Structure for Wider Damper Torsion Angle
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Solution Overview
Problem
The existing damper devices with spring seats installed on coil springs hinder the elongation of stopper holes, limiting the widening of the torsion angle and thus the performance in attenuating rotational fluctuations.
Innovation Solution
A spring seat design that includes an end surface support portion with a recess and an outer periphery support portion, allowing for the formation of a protruding portion on the second rotor's pressing surface, enabling the elongation of the stopper hole and increasing the torsion angle between the first and second rotors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring seats are installed on both ends of coil springs to prevent sliding, then the coil springs are supported and prevented from sliding against window portions, but the stopper holes cannot be elongated and the torsion angle cannot be widened
Solution Approach 1:
The spring seat is divided into two distinct functional portions: an end surface support portion for supporting the coil spring end surface, and an outer periphery support portion for supporting the radially outer part of the coil spring. This segmentation allows each portion to be optimally positioned without interfering with the stopper hole elongation, resolving the contradiction between providing reliable spring support and enabling stopper hole elongation for wider torsion angle.
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
Enables the formation of a circumferentially elongated stopper hole, enhancing the damper device's performance in attenuating rotational fluctuations by allowing a wider torsion angle and preventing coil springs from sliding, thus improving the overall rotational damping efficiency.
Implementation Method 1
The plurality of elastic members elastically couple the first rotor and the second rotor in a rotational direction
Implementation Method 2
Centrifugal forces herein act on the coil springs. Hence, when compressed, the coil springs are moved radially outward
Implementation Method 3
the coil springs slide against the window portions, whereby friction resistance is generated between the coil springs and the side plate. The damper part degrades in performance of attenuating rotational fluctuations due to the friction resistance
Data Source
AI summary
A damper device includes a first rotor, a second rotor, a plurality of elastic members, and a spring seat. The spring seat includes an end surface support portion and an outer periphery support portion. The end surface support portion includes a recess on a radially middle part thereof. The recess is recessed toward at least one of the elastic members. The end surface support portion supports one end surface of the at least one of the elastic members. The end surface support portion is supported by a pressing surface of a first accommodation portion of the first rotor and a pressing surface of a second accommodation portion of the second rotor. The outer periphery support portion supports part of a radially outer part of the at least one of the elastic members.