Geneva Drive Payload Flipping Without Slip Rings

Solution Overview

Problem

Existing methods for intermittently flipping inertial sensors, such as gyrocompasses, using stepper or servo motors are costly and require high electrical power, leading to elevated temperatures that degrade sensor performance.

Innovation Solution

A Geneva drive mechanism is used to intermittently rotate a payload, including inertial sensors, by ±180 degrees, utilizing two or four circular drive wheels with blocking discs to enable alternating rotation directions without the need for slip rings, allowing compact design and adjustable rotation angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If stepper or servo motors are used to flip inertial sensors, then the flipping operation can be achieved, but the cost and power consumption increase significantly

Engineering Contradiction:

Improveflipping operation capabilityVSAvoidelectrical power consumption

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

The patent replaces the electrical motor system (stepper or servo motors) with a purely mechanical Geneva drive mechanism. The Geneva drive uses a continuously rotating drive wheel with pins that engage with radial slots in a driven wheel to produce intermittent ±180 degree rotations, eliminating the need for expensive electrical motors and their control electronics while significantly reducing power consumption.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The Geneva drive mechanism is self-contained and uses the continuous rotation of a simple drive wheel to automatically produce the required intermittent flipping motion through its geometric design. The drive pins and radial slots work together to convert continuous rotation into intermittent ±180 degree rotations without requiring external control systems or additional energy input beyond the continuous rotation.

Inventive Principle:

Principle #25Self-service

2Ease of operation

If stepper or servo motors are used to flip inertial sensors, then the flipping operation can be achieved, but the device cost increases

Engineering Contradiction:

Improveflipping operation capabilityVSAvoidcost

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent replaces the electrical motor system (stepper or servo motors) with a purely mechanical Geneva drive mechanism. The Geneva drive uses a continuously rotating drive wheel with pins that engage with radial slots in a driven wheel to produce intermittent ±180 degree rotations, eliminating the need for expensive electrical motors and their control electronics while significantly reducing power consumption.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The Geneva drive mechanism uses simple, inexpensive mechanical components (drive wheel with pins, driven wheel with radial slots) instead of expensive motors and electronics. These mechanical parts are straightforward to manufacture and replace if needed, providing a cost-effective solution for the flipping operation.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Ease of operation

If high electrical power is used to operate motors, then the flipping operation can be achieved, but elevated temperatures are generated that degrade sensor performance

Engineering Contradiction:

Improveflipping operation capabilityVSAvoidtemperature inside closure

Core Design Contradiction:

Ease of operationVSTemperature

Solution Approach 1:

The patent replaces the electrical motor system (stepper or servo motors) with a purely mechanical Geneva drive mechanism. The Geneva drive uses a continuously rotating drive wheel with pins that engage with radial slots in a driven wheel to produce intermittent ±180 degree rotations, eliminating the need for expensive electrical motors and their control electronics while significantly reducing power consumption.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The Geneva drive produces intermittent periodic rotation of the payload, alternating between stationary periods and ±180 degree rotation phases. This periodic action is achieved through the engagement and disengagement of drive pins with radial slots, allowing the system to flip the inertial sensor when needed while remaining stationary during other periods, thereby minimizing energy consumption and heat generation.

Inventive Principle:

Principle #19Periodic action

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 Geneva drive mechanism effectively flips inertial sensors without the need for costly slip rings, reducing power consumption and maintaining sensor performance by avoiding elevated temperatures, while enabling compact and adjustable rotation angles.

Implementation Method 1

A Geneva drive is also referred to in the literature as a Maltese cross. The mechanical drive apparatus applies the operation principle of a Geneva drive to achieve the wanted payload rotation.

Methodology Applied

Scientific EffectGeneva drive: Geneva Drive

Data Source

PatentUS12473963B2Drive mechanism in particular for maytagging operation

Publication Date: 2025.11.18 MURATA MFG CO LTD

AI summary

A device includes multiple circular drive wheels rotationally connected, with two featuring drive pins. A drive motor, attached to one of these wheels, continuously rotates it, thereby rotating all connected wheels. The device has a driven wheel with two opposing radial slots that enable intermittent rotation around its axis as drive pins engage alternately, changing rotation direction in consecutive phases. The device also includes a first gearing wheel linked to the driven wheel and a second gearing wheel coupled to the first. A payload is connected to this second gearing wheel, which, with the payload, rotates 160-200 degrees in one direction when a drive pin engages one radial slot.