Rotating Shaft Damper with Centrifugal Mass Adjustment
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Solution Overview
Problem
Conventional damper devices for rotating shafts in automobiles experience deteriorated vibration damping performance at rotational speeds other than a specific speed and are affected by environmental changes, particularly due to variations in rubber and fluid characteristics.
Innovation Solution
A damper device with a damper housing, mass bodies movable in the diameter direction by centrifugal force, an annular elastic body, and a biasing member, which adjusts the natural frequency to maintain effective vibration damping across a wide range of rotational speeds and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rubber members or fluids are used to move the weight in the diameter direction, then the weight can be moved effectively, but the performance varies significantly with environmental changes such as temperature
Solution Approach 1:
The patent replaces the rubber member or fluid-based biasing mechanism with a metal coil spring. This substitution eliminates the environmental sensitivity of rubber and fluid while maintaining the biasing function. The metal spring provides consistent mechanical force to move the weight in the diameter direction regardless of temperature changes, thereby resolving the contradiction between operational effectiveness and environmental reliability.
Solution Approach 2:
The patent changes the material parameter of the biasing element from temperature-sensitive materials (rubber, fluid) to temperature-insensitive metal spring material. This parameter change ensures that the biasing force characteristics remain stable across different environmental conditions, solving the reliability issue while preserving the weight movement capability.
2Device complexity
If a fixed weight is used in the damper device, then the structure is simple, but the vibration damping performance deteriorates at rotational speeds other than a specific speed
Solution Approach 1:
The patent makes the weight movable in the diameter direction by introducing a biasing mechanism (metal spring) that allows the weight to shift position. This dynamic configuration enables the weight to move outward due to centrifugal force at higher rotational speeds, adjusting the damping characteristics to maintain effective vibration damping across a wide range of rotational speeds while adding only moderate structural complexity.
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 damper device provides stable vibration damping performance regardless of rotational speed variations and environmental changes, ensuring consistent effectiveness.
Implementation Method 1
a plurality of mass bodies (30) arranged annularly around the rotating shaft (2) inside of the damper housing (20) and configured to be movable in a diameter direction by centrifugal force
Implementation Method 2
an annular elastic body (40) formed of a circular spring-shaped elastic body abutting on the outside of the plurality of mass bodies (30) and biasing the mass body inward, and an biasing member (50) which is a leaf spring-shaped elastic body abutting on the outside of the annular elastic body (40) and biases the annular elastic body (40) inward
Data Source
AI summary
A damper device is attached to a rotating shaft to suppress amplitude at resonance of the rotating shaft. The damper device includes: a damper housing formed annularly and concentrically with the rotating shaft; a plurality of mass bodies annularly arranged around the rotation shaft inside of the damper housing and configured to be movable in the diameter direction by centrifugal force; an annular elastic body, formed of a circular spring-shaped elastic body abutting on the outside of the plurality of the mass bodies, so as to bias the mass body inward; and a biasing member, being a leaf spring-shaped elastic body abutting on the outside of the annular elastic body, so as to bias the annular elastic body inward.