Eccentric Cable Pulley for Automotive Window Shading Control
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Solution Overview
Problem
Existing shading devices for automotive windows lack compact and reliable forced control mechanisms for the closing part, which affects the efficient deployment and retraction of the shading structure.
Innovation Solution
A cable pull arrangement with a cable control pulley having eccentric deflection tracks relative to its rotational axis is used, allowing varying cable lengths to control the closing part's position, coupled with an electric drive system and a cable adjustment unit for uniform tension, enabling precise pivoting movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional control mechanism for the closing part is used, then the structure may be simpler, but the control reliability and compactness are insufficient
Solution Approach 1:
The cable control pulley is designed with rotational mobility, allowing it to dynamically adjust its rotational position to vary the cable pull length. This dynamic mechanism provides reliable forced control of the closing part while maintaining a relatively compact structure, as the rotational movement of a single pulley component achieves the control function without requiring complex multi-component assemblies.
Solution Approach 2:
The cable deflection track is positioned eccentrically relative to the rotational axis of the cable control pulley. This eccentric positioning causes the cable pull length to change as the pulley rotates, creating a variable control mechanism. The parameter change in cable length during rotation provides reliable control of the closing part's movement while keeping the device structure compact.
2Ease of operation
If the cable control pulley has eccentric cable deflection track, then the cable pull length varies to control closing part position, but the mechanism complexity increases
Solution Approach 1:
The cable deflection track is positioned asymmetrically (eccentrically) relative to the rotational axis of the cable control pulley. This asymmetric positioning ensures that during rotation, the cable pull length varies in a controlled manner, enabling easy operation of the closing part through simple rotational movement of the pulley, while the asymmetric design itself remains a single integrated feature rather than multiple complex components.
Solution Approach 2:
The cable control pulley is designed to rotate about its axis, dynamically changing the cable pull length as it rotates. This dynamic mechanism provides ease of operation for controlling the closing part's position, as the rotational movement naturally varies the cable tension and length without requiring complex control systems or multiple adjustment mechanisms.
3Measurement precision
If the closing part is forcedly controlled through multiple positions, then the shading deployment precision improves, but the mechanism becomes less compact
Solution Approach 1:
The cable control pulley rotates to dynamically adjust the cable pull length, enabling the closing part to be forcedly controlled through multiple precise positions (open position, intermediate position, closed position). This dynamic rotational mechanism achieves precise shading deployment control while maintaining a compact structure, as a single rotating pulley component provides multiple control states without requiring multiple separate actuators or large mechanism assemblies.
Solution Approach 2:
The eccentric cable deflection track causes the cable pull length to change as the pulley rotates through different positions. This parameter change enables precise control of the closing part at multiple positions (fully open, intermediate, fully closed) while the entire mechanism remains compact, as the position control is achieved through the rotational parameter of a single pulley rather than multiple discrete components.
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 solution provides a compact and functionally reliable mechanism for controlling the closing part, ensuring smooth and efficient deployment and retraction of the shading structure, particularly suitable for side windows of passenger vehicles, maintaining uniform cable tension and allowing precise control of the closing part's position.
Implementation Method 1
a cable pull arrangement with a cable control pulley having eccentric deflection tracks relative to its rotational axis is used, allowing varying cable lengths to control the closing part's position
Implementation Method 2
The drive system preferably has an electric drive motor to allow displacement of the shading structure via appropriate gearing mechanisms and drive transmission members
Data Source
AI summary
Shading device for a window pane of an automotive vehicle including a flexible shading structure held on a winding shaft. The shaft is disposed in a vehicle-fixed accommodating region with a passage, through and across which passage the shading structure is displaceable between a rest position wound up on the winding shaft and a shading position covering the window pane. The passage is capable of being closed or exposed via a pivotably mounted closing part. A drive system is provided for displacing the shading structure between the rest position and the shading position, and control kinematics are provided, coupled to the drive system, for forced control of an opening or closing movement of the closing part. The control kinematics include a cable pull arrangement provided with a cable control pulley having at least one cable deflection track eccentric in relation to a rotational axis of the cable control pulley.