Sliding Door Gear Wheel Tooth Engagement

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Solution Overview

Problem

Sliding door assemblies with heavy door leaves pose a challenge as they require high motive force from the drive motor, which is difficult to achieve without significant installation space, especially when visual aesthetics are considered.

Innovation Solution

The drive device uses a gear wheel with a toothed belt where at least two teeth of the gear wheel are fully engaged with at least two teeth of the toothed belt, allowing for even force transmission and reducing torque peaks, enabling the use of smaller, less powerful motors that can be integrated into the door leaf without compromising its ability to move heavy doors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If a drive motor is used to displace heavy door leaves, then the door leaf can be moved automatically, but the drive motor requires large installation space

Engineering Contradiction:

Improveautomatic door displacementVSAvoidinstallation space of drive motor

Core Design Contradiction:

Extent of automationVSArea of stationary object

Solution Approach 1:

The patent changes the engagement parameter of the gear wheel by ensuring that at least two teeth of the gear wheel are simultaneously fully engaged with at least two teeth of the toothed belt. This increases the contact area and distributes the force, allowing for a more compact drive motor design that still handles heavy door leaves effectively.

Inventive Principle:

Principle #35Parameter changes

2Force

If a drive motor with high motive force is used for heavy door leaves, then the door can be moved, but the drive motor creates torque peaks that require larger sizing

Engineering Contradiction:

Improvemotive forceVSAvoidpeak power

Core Design Contradiction:

ForceVSPower

Solution Approach 1:

The patent applies beforehand cushioning by ensuring multiple teeth are simultaneously engaged before the full load is applied. This distributes the force transmission and cushions against torque peaks, allowing the use of smaller drive motors that would otherwise be oversized for peak power requirements.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 configuration allows for the integration of compact drive motors that can efficiently move heavy door leaves while maintaining a visually appealing design, as it distributes the force effectively and avoids the need for high peak power motors.

Implementation Method 1

a gear wheel which cooperates with a toothed belt arranged on the frame

Methodology Applied

Scientific EffectGear mechanism: Gear

Implementation Method 2

at least two teeth of the gear wheel are simultaneously fully engaged with at least two teeth of the toothed belt

Methodology Applied

Scientific EffectForce distribution through multiple tooth engagement: Mechanical Advantage

Data Source

PatentUS10151133B2Sliding-door assembly

Publication Date: 2018.12.11 GRETSCH UNITAS GMBH BAUBESCHLAGFABRIK

AI summary

The invention relates to a sliding-door assembly, including a stationary frame, a horizontally movable door leaf, and a drive device for moving the door leaf, which drive device includes a drive motor, which is arranged on the leaf and has a toothed wheel, which interacts with a toothed belt arranged on the frame, wherein the toothed belt is wrapped around the toothed wheel over a partial periphery of the toothed wheel and wherein at least two teeth of the toothed wheel are simultaneously fully engaged with at least two teeth of the toothed belt.