Vehicle Roller Blind Retention System With Delayed Locking
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Solution Overview
Problem
Current restraint systems for motor vehicles, such as self-winding roller blinds, are complex, expensive, and prone to failure due to multiple components, failing to effectively prevent objects from shifting into the passenger compartment during deceleration, especially when the rear seat backrests are folded.
Innovation Solution
A simplified restraint system featuring a locking disk non-rotatably connected to a winding shaft with a pawl that can be adjusted between free-running and locked positions, utilizing a control cam and brake to delay locking until the specified length of the roller blind is unwound, ensuring secure fastening without continuous surface contact, thus preventing further unwinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex locking mechanism with multiple components (counting mechanism, control camshaft, viscous brake, pawl, lifting thumb) is used to prevent further unwinding of the roller blind, then the reliability of preventing object penetration is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The invention extracts and eliminates unnecessary components from the existing complex mechanism. Specifically, it removes the control camshaft, viscous brake, and counting mechanism, retaining only the essential elements (locking disk, pawl, spring) needed to achieve the locking function. This simplification directly addresses the contradiction by maintaining reliability while dramatically reducing device complexity.
Solution Approach 2:
The invention replaces expensive, complex mechanical components with simpler, more reliable elements. The locking disk with recesses and simple pawl mechanism uses fewer materials and manufacturing steps, reducing both cost and complexity while maintaining the essential function of preventing further unwinding.
2Reliability
If the pawl continuously contacts the control cam surface to prevent unwinding, then the locking reliability is improved, but noise and wear increase
Solution Approach 1:
The invention implements periodic engagement rather than continuous contact. The pawl engages with the recesses in the locking disk at specific intervals (when a recess aligns with the pawl), rather than maintaining constant surface contact. This periodic action reduces noise and wear while maintaining reliable locking during the critical unwinding prevention phase.
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 system provides effective and reliable separation of the passenger compartment from the trunk by ensuring the roller blind remains locked in place during deceleration, reducing complexity and cost while maintaining noiseless operation and simplicity.
Implementation Method 1
Movement of the pawl is slowed by a brake, at least slowing its movement from the free to the locked position.
Data Source
Figure 1~2
Figure 3~4
AI summary
The system has a locking disk (6) unrotatably connected with a shaft (2) and cooperated with a locking pawl (10), which is movable between free-wheeling- and locking positions. The pawl locks the disk against rotation in an unwinding direction of a material web (3) in the locking position. The disk includes a radial cam retaining the pawl in the free-wheeling position based on the rotation or enabling movement of pawl into the locking position. The movement of the pawl from the free-wheeling position into the locking position is decelerated by a brake (17).