Rotation Damper With Adjustable Pins For Belt Retractor
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Solution Overview
Problem
Existing rotation dampers for vehicle safety belt retractor shafts are inefficient in terms of structural space and complexity, lacking adaptive damping capabilities that can be effectively controlled or regulated.
Innovation Solution
A rotation damper with a housing and a rotatable element containing elongated pins that can be axially or radially displaced within a damping medium, allowing for adjustable damping resistance through pin length variation and incorporating a ring with spreading elements for acceleration-dependent damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If several blades are arranged inside a working space filled with a viscous medium on a shaft coupled to the belt retractor shaft, then the rotary movement can be damped due to the high viscosity of the fluid, but the structural space required becomes large and the device complexity increases
Solution Approach 1:
The rotation damper is divided into multiple functional components: a housing containing a viscous damping medium, a separate rotatable element with pins, and a coupling mechanism. This segmentation allows the damping function to be achieved in a more compact configuration compared to traditional blade-based designs, reducing the overall structural space while maintaining damping effectiveness.
Solution Approach 2:
The rotatable element with pins is nested within the housing that contains the viscous damping medium. The pins extend into the working space filled with the damping medium, creating a nested configuration where the damping mechanism is contained within the housing structure. This nesting reduces the overall volume required for the rotation damper while preserving the damping function.
2Adaptability or versatility
If the pins are arranged to be displaceable relative to the housing, then the damping effect can be controlled or regulated by variation of the effective pin length, but the device complexity and energy consumption increase
Solution Approach 1:
The pins are designed to be displaceable relative to the housing, transforming the rotation damper from a static to a dynamic structure. This allows the effective pin length to be varied, enabling control and regulation of the damping effect. The dynamic configuration provides adaptability for different damping requirements while maintaining a relatively simple structural implementation.
3Adaptability or versatility
If a drive is provided for axial displacement of the pins relative to the housing to adjust the force level, then the damping force can be regulated according to requirements, but the device complexity and energy consumption increase
Solution Approach 1:
A motion thread mechanism is employed to replace more complex mechanical drive systems for achieving axial displacement of the pins. The motion thread converts rotational motion into linear displacement with mechanical advantage, requiring comparatively small energy input to displace the pins axially even under load conditions. This substitution significantly reduces the energy consumption of the adjustment mechanism.
4Adaptability or versatility
If the ring has a higher mass inertia than the shaft, then the ring acts as an acceleration sensor detecting rotation relative to the ring during high acceleration, but the device complexity increases
Solution Approach 1:
The ring is designed with higher mass inertia than the shaft, creating an inertial counterbalance effect. During high acceleration events, the ring's inertia causes it to resist rotation relative to the shaft, effectively making the ring act as an acceleration sensor. This inertial differential provides passive acceleration detection capability without requiring additional sensors or complex control systems.
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 provides a compact, simple, and adaptive damping system that can regulate damping force levels and resistance based on acceleration, ensuring efficient energy use and real-time load management.
Implementation Method 1
a working space (12) filled with a damping medium... a rotation of the belt retractor shaft... is transferred to the blades and is damped due to the high viscosity of the fluid
Implementation Method 2
The shaft (16) is surrounded by a ring (26) arranged inside the working space (12), the ring (26) being coupled to the shaft (16) by means of a spring element (30)... A restoring in the case of a decreasing acceleration is achieved through the coupling via a spring element
Implementation Method 3
The pins (20) may have formed-on lips (22) of a flexible or an elastic material with an indentation (24) arranged between them... The rotation resistance, and hence the damping effect, can be increased by spreading the lips (22) apart
Data Source
AI summary
A rotation damper, particularly for damping the rotary movement of a belt retractor shaft of a vehicle safety belt, has a housing which delimits a working space filled with a damping medium, and an element which is rotatable relative to the housing. Several pins serving as resistance elements, which extend into the working space, are provided on the element.