Motor Vehicle Door Stop Device Lever Noise Reduction
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Solution Overview
Problem
Existing motor vehicle door latch systems produce significant noise during closure due to robust metallic components, and previous solutions to attenuate this noise are complex, costly, and difficult to integrate with various door latches, leading to high installation and construction costs.
Innovation Solution
A stop device with a deflection lever and a transfer lever is used to absorb the movement of the locking bolt, where the deflection lever initially absorbs high impulse energy up to halfway through the locking bolt's course, and the attenuation element takes over for the remaining course, allowing for a staggered and effective noise reduction without pressurizing the transfer lever or attenuation element excessively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a robust metallic locking mechanism is used to transfer forces and prevent unintentional opening, then the strength and reliability are improved, but significant closure noises are generated
Solution Approach 1:
The patent applies beforehand cushioning by introducing a stop device with an attenuation element that is pre-positioned to absorb closure impulses before they reach the locking mechanism. The attenuation element (spring or elastomer) is installed in advance to cushion the impact, preventing noise generation while maintaining the robust metallic locking mechanism's strength and reliability
2Object-generated harmful factors
If a stop device with pivoting section and attenuation element is added to attenuate closure noise, then the noise reduction is improved, but the device complexity and installation cost increase
Solution Approach 1:
The patent merges the stop device with the existing locking bolt structure by integrating the attenuation element directly into the locking bolt's path. The stop device combines a lever arm that pivots on the door edge with an attenuation element, merging noise attenuation functionality with the existing locking mechanism structure rather than adding a completely separate system
Solution Approach 2:
The patent uses an intermediary lever arm that pivots on the door edge to mediate between the locking bolt and the attenuation element. This lever arm translates the linear motion of the locking bolt into rotational motion that activates the attenuation element, providing a simple mechanical intermediary that reduces complexity compared to direct attenuation approaches
3Object-generated harmful factors
If a stop device with lever arrangement is installed to reduce closure noise, then the noise attenuation is improved, but the installation cost and difficulty increase
Solution Approach 1:
The patent segments the noise attenuation function into two distinct components: a stop device with lever arm that handles the initial impulse, and a separate attenuation element (spring or elastomer) that provides sustained attenuation. This segmentation allows each component to be optimized independently and installed separately, reducing overall installation complexity and cost
4Object-generated harmful factors
If the attenuation element is pressurized excessively to reduce noise, then the noise reduction effectiveness is improved, but the device complexity and force requirements increase
Solution Approach 1:
The patent applies partial action by designing the lever arm geometry and pivot position to apply only the necessary portion of force to the attenuation element. The lever arm is configured to activate the attenuation element partially during the closure sequence, providing sufficient noise reduction without excessive pressurization that would increase force requirements and device complexity
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 simple, cost-effective, and modular noise reduction mechanism that can be easily retrofitted, effectively absorbing impulse energy and reducing noise during motor vehicle door closure, while maintaining the structural integrity of the door latch system.
Implementation Method 1
The deflection lever (6) interacting with the locking bolt (3) alone is set up at least in part to absorb the movement of the locking bolt (3)... the deflection lever (6) has movement absorption or impulse absorption for the locking bolt (3)
Implementation Method 2
the further course of the locking bolt is then additionally attenuated with the attenuation element... the transfer lever (7) works on the attenuation element (8)... to finally attenuate the movement of the locking bolt
Data Source
AI summary
The invention relates to a motor vehicle door which is fitted with a motor vehicle door lock and an associated locking bolt and with a stop device with corresponding damping elements. Said stop device interacts, at least when the locking bolt engages in the motor vehicle door lock, with the relevant locking bolt for damping the movements thereof. According to the invention, said stop device is fitted with at least one deflection lever and a transmission lever. In this respect, the deflection lever interacting with the locking bolt is designed to at least partially absorb the movement of the locking bolt.