Balancing Mechanism for Non-Constant Transmission Torque Reduction

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Solution Overview

Problem

Current machine working mechanisms with non-constant transmission require oversized electric motors to handle dynamic inertial forces, leading to excessive input driving torque, which is not effectively reduced by existing methods.

Innovation Solution

A method and device that apply a mirror-inverted driving torque to the input element of a working mechanism, using a balancing mechanism with a predefined torque course that cancels out the dynamic inertial forces, reducing the total required driving torque by interconnecting a working mechanism with a balancing mechanism via a constant rotation drive shaft.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If members of the kinematic chain are balanced to restrict force reactions on the machine frame, then force reactions are reduced, but the weight of members increases, leading to increasing required driving torque

Engineering Contradiction:

Improveforce reactions on machine frameVSAvoidrequired driving torque

Core Design Contradiction:

ForceVSPower

Solution Approach 1:

The patent applies counterbalancing mechanisms to offset the dynamic inertial forces generated by moving members. By introducing counterweights that generate opposing forces, the system reduces the net force reactions on the machine frame while compensating for the additional weight through force cancellation, thereby resolving the contradiction between force reduction and power requirements.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The patent inverts the conventional approach by not simply adding more balancing mass, but rather by strategically placing counterweights that generate forces opposite to the inertial forces. This inversion of the balancing strategy allows force reduction without proportionally increasing the driving torque requirement.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If electric motors are dimensioned according to maximum values of driving torque, then peak torque requirements are met, but the motor power is oversized, leading to inefficiency

Engineering Contradiction:

Improvepeak torque capabilityVSAvoidmotor power size

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent uses counterbalancing mechanisms to reduce the peak driving torque requirements by offsetting dynamic inertial forces. This allows the electric motor to be dimensioned for lower peak torque while still meeting the maximum torque requirements, eliminating the need for oversized motors and improving overall system efficiency.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

3Power

If flywheels are used to compensate for peak driving torque values, then maximum torque requirements are reduced, but the rotation speed of the flywheel decreases, causing further non-uniformities in operation

Engineering Contradiction:

Improvemaximum driving torqueVSAvoidrotation speed uniformity

Core Design Contradiction:

PowerVSSpeed

Solution Approach 1:

The patent replaces flywheel-based torque compensation with a counterweight system that generates opposing forces to cancel dynamic inertial forces. This approach reduces peak driving torque requirements without the speed fluctuations and non-uniformities associated with flywheel operation, as counterweights move in sync with the kinematic chain rather than storing and releasing energy.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

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

This approach effectively reduces the input driving torque by exchanging kinetic energy between the working and balancing mechanisms, maintaining constant kinetic energy and minimizing energy losses due to passive resistances, thereby optimizing the operation of machine working mechanisms.

Implementation Method 1

Methodology Applied

Scientific EffectKinetic energy exchange: Inertia

Data Source

PatentEP3809014A1Method and device for reducing the driving torque of machine mechanisms with non-constant transmission

Publication Date: 2021.04.21 VUTS AS

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AI summary

The invention relates to a method for reducing the input driving torque of machine working mechanisms (1) with non-constant transmission, especially for handling equipment and production machines, in which the working mechanism (1) is driven by a uniform rotary movement with a predefined driving torque (M1) having a course dependent on the angle (ψ) of rotation of the input element of the working mechanism (1). A predefined driving torque (M2) is applied to the input element of the working mechanism (1), whereby the course of the predefined driving torque (M2) is mirror-inverted with respect to the predefined driving torque (M1) depending on the angle (ψ) of rotation of the input element of the working mechanism (1). In addition, the invention relates to a device for reducing the input driving torque of machine working mechanisms (1) with non-constant transmission, especially for handling equipment and production machines, which comprise an input element coupled to a shaft of a uniform rotary drive. The input element of the working mechanism (1) is connected by a rigid element to an input element of a balancing mechanism (2), whereby the balancing mechanism (2) has a predefined driving torque (M2), whose course, depending on the angle (ψ) of rotation of the input element of the balancing mechanism (2), is mirror-inverted with respect to the predefined driving torque (M1), depending on the angle (ψ) of rotation of the input element of the working mechanism (1).