Motor Vehicle Door Lock Plastics Pin Mounting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor vehicle door locks with mass inertia elements face challenges in providing high functional reliability, ease of assembly, and cost-effective fastening solutions, often relying on metallic components that can be prone to corrosion and weighty.
Innovation Solution
A motor vehicle lock design utilizing a plastics pin for mounting the mass inertia element, which offers corrosion resistance, flexibility, and a lightweight, cost-effective solution with a structurally favorable design, allowing for a high degree of functional reliability and reduced thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic stepped pin is used to support and fasten the mass inertia element, then a high degree of stability and a permanent bearing point are achieved, but the risk of corrosion and increased weight occur
Solution Approach 1:
The patent changes the material parameter of the stepped pin from metal to plastic. This material substitution eliminates corrosion risk while maintaining the structural function of supporting and fastening the mass inertia element. The plastic material provides sufficient mechanical properties for the application while being inherently corrosion-resistant.
Solution Approach 2:
The patent employs a plastic stepped pin that combines structural integrity with corrosion resistance. The plastic material serves as a composite solution that replaces traditional metallic materials, providing both mechanical support and protection against harmful environmental factors like corrosion.
2Reliability
If a metallic stepped pin is used to support and fasten the mass inertia element, then a permanent bearing point is provided, but the assembly process becomes more complex and costly
Solution Approach 1:
The patent changes the material parameter from metal to plastic, which fundamentally alters the manufacturing and assembly process. Plastic stepped pins can be produced through injection molding, allowing for more complex geometries to be created in a single manufacturing step, and they can be assembled using simpler insertion and retention methods compared to metallic pins that may require threading, riveting, or welding.
Solution Approach 2:
The plastic stepped pin represents a cost-effective alternative to metallic pins. While plastic may be perceived as less durable, in this application it provides sufficient longevity while being cheaper to manufacture and assemble. The reduced material cost and simplified assembly process make this an economically advantageous solution.
3Object-affected harmful factors
If a plastics pin is used to mount the mass inertia element, then corrosion resistance and weight reduction are achieved, but the bearing stability must be maintained
Solution Approach 1:
The patent changes the material parameter from metal to plastic, which inherently provides corrosion resistance. The design compensates for any potential reduction in strength by optimizing the plastic pin's geometry, including the stepped configuration that provides bearing surfaces and retention features. The plastic material is selected to have appropriate mechanical properties for the application.
Solution Approach 2:
The stepped pin features curved or rounded bearing surfaces that provide stable contact with the mass inertia element. The geometry includes stepped portions with appropriate radii that distribute loads and maintain stable positioning, compensating for the lower strength of plastic material compared to metal.
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 plastics pin provides a secure and reliable mounting for the mass inertia element, enhancing the lock's functionality and weight efficiency while preventing corrosion-related issues, and enabling a simpler, more affordable assembly process.
Implementation Method 1
the mass inertia of the control lever ensures that the actuation of the actuating lever is delayed
Implementation Method 2
the mass inertia element can be mounted in the motor vehicle lock by a plastics pin
Data Source
AI summary
A motor vehicle, in particular a side door lock, comprising a locking mechanism leaving a rotary latch and at least one locking pawl, an actuating lever chain with at least one actuating lever and a release lever, wherein a blocked locking mechanism can be unblocked by means of the release lever, and a coupling element between the actuating lever and the release lever, wherein the coupling element can be actuated by means of a mass inertia element which is mounted in the motor vehicle lock, and wherein the mass inertia element can be stored in the motor vehicle lock by means of a plastic mandrel.