Helix-Driven Linear Actuator With Anti-Rotation Tube Guidance

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Solution Overview

Problem

Existing mechanisms for converting rotational motion into linear motion in fluid handling and dispensing devices often fail to prevent rotation of the linear member during linear travel, leading to inefficiencies and friction issues.

Innovation Solution

A configuration featuring a female helix in a powered rotating component with integrated lugs that engage the helix and anti-rotation features to prevent rotation, allowing for smooth linear travel, utilizing hemispherical or tapered protrusions and a gear housing with mating grooves to guide and retain the linear member, reducing friction with lubrication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a lead screw mechanism is used to convert rotational motion into linear motion, then linear displacement is achieved, but the linear member rotates during travel causing friction and inefficiency

Engineering Contradiction:

Improvelinear displacement efficiencyVSAvoidfriction loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

Instead of using a traditional male helix on the rotating component, the patent inverts the approach by placing a female helix (helical groove) on the rotating primary gear and using a linear member with protrusions that engage this groove. This inversion allows the linear member to be passively guided without rotation while the rotating component provides the driving motion.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces an intermediary helical groove that mediates between the rotating primary gear and the linear member. This groove acts as a guide that converts rotational motion into linear motion while preventing the linear member from rotating, thereby reducing friction and improving efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of energy

If anti-rotation features are added to prevent rotation of the linear member, then friction is reduced, but device complexity increases

Engineering Contradiction:

Improvefriction lossVSAvoidmechanical structure complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent merges the anti-rotation function into the existing helix engagement mechanism. The female helix groove on the rotating component and the corresponding protrusions on the linear member serve dual purposes: they transmit motion and simultaneously prevent rotation of the linear member, eliminating the need for separate anti-rotation features.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The helical groove and protrusion interface is designed to perform multiple functions simultaneously: it converts rotational motion to linear motion, provides guidance for the linear member, and prevents rotation. This multi-functionality reduces the need for additional components and simplifies the overall device structure.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Length of moving object

If multiple lugs are spaced to align with helix pitch, then travel distance is extended, but manufacturing precision requirements increase

Engineering Contradiction:

Improvelinear travel distanceVSAvoidlug spacing precision

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The patent segments the linear member into multiple sections, each with lugs spaced at intervals corresponding to the helix pitch. This segmentation allows the linear member to engage with multiple rotations of the primary gear, extending the total travel distance while maintaining manageable manufacturing tolerances for each individual lug spacing.

Inventive Principle:

Principle #1Segmentation

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

Enables efficient and friction-reduced linear displacement of fluid dispensing tubes or solid members by preventing rotation during travel, enhancing mechanical stability and extending the travel distance while maintaining reversible control.

Implementation Method 1

A primary gear is provided including a central bore having at one or more helix grooves formed into a surface of the central bore. The one or more helix grooves receive the respective hemispherical lug so that each helix groove mates with a respective hemispherical lug

Methodology Applied

Scientific EffectHelix mechanism: Helix

Implementation Method 2

both of which are lubricated with a grease, to reduce friction within the at least one helix groove

Methodology Applied

Scientific EffectLubrication: Lubrication

Data Source

PatentUS11525497B2Linear actuating member driven by a rotating helix

Publication Date: 2022.12.13 HTI TECH & IND INC

AI summary

An actuator assembly is provided for converting rotation into linear displacement including a linear fluid dispensing tube for linear displacement. Hemispherical lugs are monolithically formed on the linear member. A primary gear includes a central bore having helix grooves formed into a surface of the central bore. The helix grooves receive the hemispherical lugs so that each helix groove mates with a respective hemispherical lug to reduce friction, so that hemispherical lugs slide smoothly within the respective helix grooves. Linear projections are formed on the exterior surface of the dispensing tube and extend longitudinally along the dispensing tube. A projecting portion has an aperture for receiving and guiding the dispensing tube through the linear displacement. Mating grooves are formed on an interior of the projecting portion for receiving and guiding the linear projections, thereby preventing the dispensing tube from rotating during travel.