Rotary Balancer with Oscillating Weights for Dynamic Imbalance Correction
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Solution Overview
Problem
Existing balancers are ineffective in correcting dynamic imbalance at low rotation speeds, as they rely solely on centrifugal force, which is insufficient, and only correct imbalance in the X-Z plane, failing to adapt to changes in rotation conditions.
Innovation Solution
A balancer design with weights that freely oscillate in arbitrary directions within storage chambers, featuring a concave curved receiving surface and convex curved pressing surfaces, allowing correction in the Z-axis direction, and a cylindrical shape for effective imbalance correction across all directions (X, Y, Z) at varying rotation speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a balancer relies solely on centrifugal force for dynamic imbalance correction, then correction performance is excellent at high rotation speeds, but correction performance becomes insufficient at low rotation speeds
Solution Approach 1:
The patent introduces a new dimension of correction by adding the Z-axis (rotation axis direction) to the traditional X-Y plane correction. The guiding plane is inclined at an angle θ relative to the X-Z plane, enabling weights to move not only radially outward due to centrifugal force but also along the rotation axis direction. This dimensional expansion allows the balancer to generate both radial balancing forces and axial corrective forces, making it effective across both high and low rotation speeds.
Solution Approach 2:
The patent employs dynamic weight positioning where weights can freely move within storage chambers constrained by guiding planes. The guiding planes are inclined surfaces that allow weights to oscillate and reposition themselves dynamically based on the combined effects of centrifugal force and gravitational force. This dynamic adaptation enables the system to automatically adjust to varying rotation speeds and generate appropriate corrective forces in both radial and axial directions.
2Reliability
If a balancer only corrects imbalance in the X-Z plane perpendicular to the rotation axis, then the structure remains simple, but it fails to correct imbalance in the direction of the rotation axis
Solution Approach 1:
The patent adds the Z-axis dimension to the traditional two-dimensional X-Y correction plane by inclining the guiding plane at an angle θ relative to the X-Z plane. This inclination allows weight movement to have a component along the rotation axis direction, enabling three-dimensional imbalance correction. The inclined guiding plane transforms the storage chamber structure into a multi-functional element that simultaneously provides radial constraint and axial correction capability.
3Manufacturing precision
If fixed balance correction is applied for a certain rotation speed, then balance is fine immediately after correction, but dynamic imbalance is created again when rotation speed changes or weight changes due to tool changing
Solution Approach 1:
The patent transforms the static weight positioning into a dynamic system where weights can freely move within storage chambers guided by inclined planes. The weights automatically reposition themselves in response to changing rotation speeds and load conditions by oscillating along the inclined guiding planes. This dynamic adaptation ensures continuous balance correction without requiring manual intervention when rotation conditions change.
Solution Approach 2:
The balancer system performs self-correction by allowing weights to automatically reposition themselves based on the forces acting upon them during rotation. The inclined guiding planes enable the weights to self-adjust their positions to counteract imbalances caused by varying rotation speeds or tool changes, eliminating the need for external measurement and correction operations.
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 balancer effectively corrects dynamic imbalance at both high and low speeds, extending the service life of grinding wheels and spindles by ensuring uniform wear, and reducing production costs while maintaining high accuracy and simplicity.
Implementation Method 1
lack of centrifugal force created by rotation was the reason for poor performance in correcting dynamic imbalance
Implementation Method 2
correcting dynamic imbalance in the direction of the rotation axis was also necessary, in instances where centrifugal force was lacking
Data Source
AI summary
A balancer, attachable via its attaching portion to a rotatable body, and rotatable together therewith about its rotation axis, includes: weights of same mass and shape; and a weight holder with storage chambers for housing the weights, respectively, such that the weights can oscillate in arbitrary directions. The weight is shaped similar to and smaller than the chamber. The chamber is a cylindrical space extending alongside its central axis; and has concave curved ends perpendicular to the central axis. Midpoints of the central axes of the chambers are contact points on a circumference of a circle having the rotation axis as its center and being on an arbitrary plane perpendicular to the rotation axis; and are positioned so that they create a rotational symmetry around the rotation axis. The balancer can correct dynamic imbalance in rotatable bodies, such as machine tools, at both low-speeds and high-speeds of rotation.