Cycloidal Reduction Assembly for Safer High-Speed Tool Rotation

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Solution Overview

Problem

High-speed rotational tools pose risks in medical and other industries due to unnecessary variables during procedures, necessitating a method to reduce rotational velocity effectively.

Innovation Solution

A reduction assembly comprising a drive shaft, disk assembly, and disk receptacle, where the disk assembly with lobes interacts with a disk receptacle having protrusions, allowing for a cycloidal speed reduction mechanism that slows down the rotational velocity of tools, reducing the number of moving parts and stress on components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high-speed rotational tools are used, then productivity and operational efficiency are improved, but safety risks and procedural variables increase

Engineering Contradiction:
Improveoperational efficiencyVSAvoidsafety risks
Core Design Contradiction:
ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a dynamic speed control system where a variable speed drive continuously adjusts the rotational speed of the tool based on real-time feedback from sensors monitoring load, torque, and operational parameters. This dynamic adjustment allows the system to operate at high speeds during normal conditions while automatically reducing speed when risk thresholds are approached, thus maintaining both productivity and safety.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system incorporates multiple feedback mechanisms including torque sensors, current monitors, and operational feedback loops that continuously communicate with the variable speed drive. When abnormal conditions are detected (such as excessive torque or unusual load patterns), the feedback system triggers automatic speed reduction or shutdown, eliminating safety risks while preserving high-speed operation during normal productive work.

Inventive Principle:
Principle #23Feedback

2Reliability

If speed reduction mechanisms are added, then safety and control are improved, but device complexity increases

Engineering Contradiction:
Improvesafety controlVSAvoidmechanism complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The variable speed drive unit serves multiple functions simultaneously: it controls motor speed, provides torque limitation, enables reverse rotation, and integrates safety monitoring. By consolidating these functions into a single multi-functional device rather than adding separate mechanisms for each function, the system achieves improved safety control without proportionally increasing device complexity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent introduces a microprocessor-based control system as an intermediary that coordinates between the motor, sensors, and speed drive. This intelligent intermediary manages the complexity by centralizing control logic, automatically processing sensor data, and making real-time decisions about speed adjustment, thereby simplifying the overall system architecture despite the added functionality.

Inventive Principle:
Principle #24Intermediary (Mediator)

3Reliability

If torque limitation is implemented, then procedural variables are reduced, but power transmission capability is limited

Engineering Contradiction:
Improveprocedural controlVSAvoidpower transmission
Core Design Contradiction:
ReliabilityVSPower

Solution Approach 1:

The torque limitation system is designed as a dynamic rather than static mechanism. The variable speed drive continuously monitors torque levels and adjusts motor output in real-time, allowing the system to transmit high power during normal operation while automatically limiting torque when threshold values are approached. This dynamic approach maintains both procedural control and power transmission capability throughout the operational cycle.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system changes operational parameters on-the-fly by adjusting motor speed and torque output based on real-time conditions. Rather than being constrained by fixed torque limits, the system dynamically modifies these parameters to maintain optimal power transmission while staying within safe procedural boundaries, thus resolving the contradiction between torque limitation and power capability.

Inventive Principle:
Principle #35Parameter changes

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 cycloidal speed reduction mechanism effectively decreases rotational velocity, enhancing safety by reducing variables in procedures and improving durability and alignment of parts, while maintaining proper operation.

Implementation Method 1

The middle segment has a centerline that lies on a second axis that is parallel to and displaced from the first axis. The disk assembly has a disk with a body and a plurality of lobes positioned around the body. The disk is configured to engage the disk receptacle.

Methodology Applied
Scientific EffectCycloidal motion:

Data Source

PatentUS11441642B2Hypocycloid speed buffer
Publication Date: 2022.09.13 ECA MEDICAL INSTR
  • US11441642B2 patent drawing
  • US11441642B2 patent drawing
  • US11441642B2 patent drawing

AI summary

A reduction assembly, attachable to a torque limiting device, comprising a drive shaft having an input segment, an eccentric segment, and an output segment, wherein the input segment and the output segment each have a centerline running along a same first axis, and wherein the eccentric segment has a center line running along a second axis, the second axis being parallel to the first axis and positioned a first distance away from the first axis. The assembly further comprising a disk assembly having a disk with a body, a plurality of lobes positioned concentrically on the body, and an opening extending through the body, the opening configured to slidably engage the eccentric segment of the drive shaft. The assembly further comprising a disk receptacle configured to engage with the disk, the receptacle having a floor and a wall with a plurality of protrusions extending from the wall, wherein the number of the plurality of protrusions is equal to one more than the number of the plurality of lobes on the disk.