Automobile Rear Window Sunshade Telescopic Bar Mechanism

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Solution Overview

Problem

Conventional sunshade devices for rear door windows of automobiles face issues with operational noise, complexity, and sunshade screen flapping due to slender telescopic bars and multiple gears, which hinder smooth operation and reliability.

Innovation Solution

A sunshade device utilizing a telescopic bar and an actuation arm connected to both ends of the sunshade screen rod, with a single driving mechanism assembly that includes a flexible driving cable with helical gear teeth directly meshed with a worm wheel, reducing noise and enhancing operational efficiency and reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If telescopic bars are used to raise and lower the sunshade screen rod, then the sunshade device can be applied to rear door windows, but the bars shake and the screen flaps when extended or retracted

Engineering Contradiction:

Improveapplicability to rear door windowVSAvoidoperational stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The device uses two separate telescopic bars instead of one, with each bar supporting one end of the sunshade screen rod. This segmentation distributes the load and reduces shaking compared to a single bar system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The telescopic bars are designed to dynamically extend and retract during operation, allowing the sunshade screen to be raised and lowered while maintaining structural stability through controlled motion rather than rigid fixed positions.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If multiple gears are used in the driving mechanism, then the telescopic bars can be extended and retracted, but operation noise increases and structure becomes complicated

Engineering Contradiction:

Improvefunctionality of extension and retractionVSAvoidnumber of gears

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent removes intermediate gears from the driving mechanism, using only a worm gear and worm wheel pair. This extraction of unnecessary components simplifies the structure and reduces noise while maintaining the extension and retraction functionality.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The complex multi-gear mechanical system is replaced with a simpler worm gear mechanism that provides the same functional outcome (extension and retraction of telescopic bars) with fewer moving parts, reduced noise, and improved reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If flexible driving cables with spur gear teeth are used, then the telescopic bars can be driven, but the structure becomes complicated and noise increases

Engineering Contradiction:

Improvedriving capabilityVSAvoidcable and gear structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent eliminates the spur gear teeth from the flexible driving cable, retaining only the essential cable structure. This removal of unnecessary gear features simplifies the cable design and reduces noise while preserving the driving capability through the worm gear mechanism.

Inventive Principle:

Principle #2Taking out (Extraction)

4Productivity

If the sunshade screen rod is raised and lowered by telescopic bars, then the device can operate, but the bars shake when the window is lowered during driving

Engineering Contradiction:

Improveoperation capabilityVSAvoidstability during driving

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The use of two separate telescopic bars instead of one provides better distribution of mechanical loads and reduces the shaking and flapping that occurs during vehicle operation, improving stability while maintaining productivity.

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

The solution allows for simultaneous and precise raising and lowering of the sunshade screen, reducing flapping and noise, while improving operational reliability and power transmission efficiency, making it suitable for rear door windows with a width less than height.

Implementation Method 1

a worm wheel meshed with a worm secured to the rotation shaft of an electric motor is secured to an output shaft

Methodology Applied

Scientific EffectWorm drive: Worm Drive

Implementation Method 2

a flexible driving cable with helical gear teeth directly meshed with a worm wheel

Methodology Applied

Scientific EffectHelical gear meshing: Gear

Data Source

PatentUS7364215B2Sunshade device for rear door window of automobile

Publication Date: 2008.04.29 KOREA FUEL TECH CORPORATION

AI summary

In a sunshade device for the rear door window of an automobile both ends of a sunshade screen rod, to which an end of the sunshade screen wound on the winding roll biased by an elastic member in a frame is fastened, are raised and lowered by a telescopic bar and an actuation arm, which are extended or retracted and erected or tilted through a single driving mechanism assembly including a driving motor, so as to spread or wind the sunshade screen.