Direct Drive Vehicle Window Shade Reducing Friction
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Solution Overview
Problem
Existing electric window shade apparatuses for vehicles experience high friction and increased operating load due to the long distance between the motor and the shade bar, leading to malfunction and noise generation.
Innovation Solution
A direct drive type electric window shade apparatus utilizing a plurality of drums and pulleys directly driven by a motor, with cables wound on these components to minimize the transmission path length and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a motor drives a worm wheel gear with a long transmission path, then the shade bar can be moved, but high friction and increased operating load occur
Solution Approach 1:
The patent extracts and eliminates the intermediate transmission components (worm wheel gear and long flex wire path) from the drive system. By directly connecting the motor to the drum that winds the cable, the transmission path is shortened and the source of high friction is removed, thereby reducing operating load while maintaining reliability
Solution Approach 2:
The patent introduces a cable-wound drum as an intermediary mechanism between the motor and the shade bar. This drum converts the motor's rotational motion directly into cable tension, providing an efficient force transmission path that avoids the high-friction worm wheel gear while still enabling controlled movement of the shade bar
2Ease of operation
If a long flex wire path is used to transmit motor force, then the shade bar can be actuated, but friction increases causing malfunction and noise
Solution Approach 1:
The patent removes the problematic long flex wire transmission path and replaces it with a cable-wound drum system. The cable is wound directly on the drum that is driven by the motor, creating a compact force transmission path that eliminates excessive friction and the associated malfunction and noise
Solution Approach 2:
The patent uses a drum (cylindrical/spheroidal form) to wind the cable, allowing the cable to follow a curved path around the drum circumference. This curved winding path on the drum surface reduces friction compared to a long straight flex wire path, while still enabling effective force transmission to actuate the shade
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 minimizes friction and operating noise, enhancing the reliability and quiet operation of the shade system while allowing simultaneous extension of the main and sub-shades.
Implementation Method 1
an operation of a motor
Implementation Method 2
a cable having a first side wound on an outer circumferential surface of the drum so that the cable operates the shade module while being moved in conjunction with rotation of the drum
Implementation Method 3
at least one pulley, on which a second side of the cable is wound, the pulley configured to determine a moving path of the cable
Data Source
AI summary
An electric window shade apparatus for a vehicle is proposed, the electric window shade apparatus being configured to receive power directly from a motor. An electric window shade apparatus for a vehicle according to an embodiment of the present disclosure includes: a shade module configured to be unwound or wound automatically by a driving force so as to move with respect to a window glass; and a driving module providing the driving force to the shade module by an operation of a cable wound on at least one drum driven by a motor.