Pendulum Vibration Damper Raceway Alignment for Smooth Rolling
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Solution Overview
Problem
Existing torsional vibration dampers fail to effectively damp vibrations due to misalignment of raceway surfaces, leading to inefficient damping performance.
Innovation Solution
A pendulum vibration damper design with accurately positioned and aligned arcuate raceway surfaces on the inertia body, allowing smooth rolling motion and enhanced damping through centrifugal force-induced oscillation, utilizing a rib to restrict axial movement and maintain alignment across the rotational center axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If inertial bodies are arranged on both sides of the rotating body and processed separately to form rolling surfaces, then the structure is symmetric and balanced, but the positions of the rolling surfaces are displaced from the predetermined reference position and profiles are misaligned
Solution Approach 1:
The inertia body is divided into two separate inertia bodies arranged symmetrically on both sides of the rotating body. Each inertia body is processed separately to form a rolling surface, allowing independent manufacturing while maintaining overall symmetry. This segmentation enables the use of separate processing for each side while preserving the balanced structure.
Solution Approach 2:
A reference marking is introduced as an intermediary element during the processing of each inertia body. The reference marking serves as a common reference point for both inertia bodies, ensuring that the rolling surfaces are formed at precise positions and profiles relative to the rotational center axis, even when processed separately.
2Power
If the rolling body is centrifugally pushed onto the rolling surface, then the rolling motion transmits torque effectively, but the rolling body tilts with respect to the rotational center axis when raceway surfaces are misaligned
Solution Approach 1:
The rolling surfaces are pre-formed with precise profiles and positions on the inertia bodies before assembly. The reference marking ensures that the rolling surfaces are created at the correct locations and orientations, so that when the rolling body is centrifugally pushed onto the rolling surface during operation, it maintains proper alignment with the rotational center axis and rolls smoothly without tilting.
3Loss of energy
If the rolling body oscillates on misaligned rolling surfaces, then centrifugal force is utilized for damping, but the oscillating motion is inefficient and damping performance is reduced
Solution Approach 1:
The patent replaces the conventional rolling surface configuration with a precisely aligned arcuate rolling surface that guides the rolling body's oscillating motion. The reference marking enables the rolling surface to be formed with the correct curvature and orientation, allowing the rolling body to oscillate efficiently along the arcuate path and generate effective damping torque through centrifugal force, rather than tilting and wasting energy on misalignment.
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 ensures effective vibration damping by maintaining the rotational center axis parallelism, reducing dimension errors, and enhancing the damping performance by precise alignment and surface hardness optimization.
Implementation Method 1
The rolling mass is brought into contact to the raceway surface by a centrifugal force derived from the rotation of the rotary member
Implementation Method 2
oscillated on the raceway surface by a pulsation of the torque applied to the rotary member
Implementation Method 3
The rolling mass oscillated toward one end of the raceway surface by the pulsation of the torque applied to the rotary member is returned to a radially outermost portion of the raceway surface by a torque established by a displacement of the rolling mass from the radially outermost portion to said one end of the raceway surface. The torque thus established by the displacement of the rolling mass from the radially outermost portion to said one end of the raceway surface acts as a vibration damping torque to damp vibrations derived from the pulsation of the torque applied to the rotary member.
Data Source
AI summary
A pendulum vibration damper in which raceway surfaces are processed accurately at desired positions to damp vibrations effectively by oscillating motions of rolling masses, and a manufacturing method thereof. The pendulum vibration damper comprises a first attachment and a second attachment formed symmetrically. A first raceway surface is formed on the first attachment, and a second raceway surface is formed on the second attachment. The first attachment and the second attachment are attached to each surface of the inertia body a while being positioned to align the first raceway surface and the second raceway surface with a predetermined common profile in the axial direction.