Damper Friction Mechanism to Prevent Cone Spring Turnover
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Solution Overview
Problem
Existing damper apparatuses fail to prevent the cone spring from reversing its taper orientation due to excessive axial loads, leading to potential turning over and reduced durability.
Innovation Solution
The damper apparatus includes a friction generation mechanism with load support surfaces on the bush and retention plate that accommodate the cone spring's reversed installation, featuring step parts to reduce axial biasing force and prevent turning over, ensuring correct installation detection and maintaining the cone spring's orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the cone spring is biased with axial force between the bush and retention plate, then the friction generation mechanism can generate frictional torque, but the cone spring may turn over into reversed taper orientation under enormous axial load
Solution Approach 1:
The patent applies preliminary anti-action by designing the retention plate with a pressing force application point positioned radially outward from the bush's reaction force point. This creates a preemptive counter-moment that opposes any potential moment that would cause the cone spring to turn over, thereby preventing orientation reversal before it can occur under enormous axial loads
2Power
If the cone spring is installed with small inclination angle, then it can effectively generate frictional torque, but it becomes more susceptible to turning over under axial load
Solution Approach 1:
The patent implements preliminary anti-action by strategically positioning the pressing force application point on the retention plate radially outward from the bush center. This creates a preventive counter-moment that acts before the harmful turning over can occur, counteracting the susceptibility introduced by the small inclination angle necessary for effective frictional torque generation
3Force
If the pressing force point is positioned closer to the bush, then the cone spring can be compressed more effectively, but the moment to reverse taper orientation increases
Solution Approach 1:
The patent applies preliminary anti-action by positioning the pressing force point radially outward, which creates a counter-moment that preemptively opposes any moment that would cause taper orientation reversal. This allows effective axial compression while preventing the harmful effect of turning over
4Adaptability or versatility
If the cone spring is allowed to turn over, then it can accommodate reversed installation, but it reduces durability and performance
Solution Approach 1:
The patent implements preliminary anti-action by designing the retention plate geometry such that the pressing force is applied at a point radially outward from the bush. This creates a preventive counter-moment that stops the cone spring from turning over to reversed orientation, thereby maintaining durability while the structure still physically accommodates reversed installation
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 configuration effectively prevents the cone spring from turning over, enhances durability by reducing axial biasing force, and facilitates easy detection of incorrect installation, thereby improving the damper apparatus's performance and reliability.
Implementation Method 1
a cone spring that has an annular shape, and is disposed between the bush and the retention plate so as to be compressed, and biases the bush toward the annular friction surface of the second rotor
Implementation Method 2
a friction generation mechanism structured to generate frictional torque in response to relative rotation between the first rotor and the second rotor
Data Source
AI summary
A friction generating mechanism of a damper apparatus includes a bushing in contact with an annular friction surface of a spline hub, and a cone spring arranged in a compressed state between a retaining plate and the bushing. A first load support surface of the bushing and a second load support surface of the retaining plate have step portions recessed so as to respectively receive an outer peripheral edge and an inner peripheral edge of the cone spring, when the taper of the cone spring is reversed. The radial positions of boundaries of the step portions are in a relationship of D1>D2, which inhibits the cone spring from being reversed even when an excessive load in the axial direction is input.