Motor Vehicle Lock Spring Lip Creaking Noise Reduction
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Solution Overview
Problem
Existing lock designs, particularly in motor vehicles, fail to fully eliminate creaking noises between the rotary latch and locking bolt due to inadequate noise damping, despite the use of spring lips and noise protection measures.
Innovation Solution
A metal clamp with a bounding bead is designed to securely attach to the spring lip, creating a continuous wall that prevents creaking noises by ensuring a precise and stable fit, with flexible flanks for easy installation and a recessed seat area for secure retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal plate or profile element is slid onto the spring lip to eliminate creaking noise, then the creaking protection is effective, but the production and assembly process becomes more complex
Solution Approach 1:
The metal clamp is designed to be slid onto the spring lip and retained by the bounding bead, creating a nested structure where the clamp encloses the spring lip. This nesting approach simplifies assembly compared to separate attachment methods while maintaining effective creaking protection through the precise fit and retention mechanism.
Solution Approach 2:
The bounding bead on the spring lip automatically retains the metal clamp in its correct position once slid on, eliminating the need for additional fastening steps or complex assembly procedures. The spring lip's own geometry (the bounding bead) provides the retention function, simplifying both production and assembly.
2Duration of action of stationary object
If the metal clamp is made from thin stainless steel for smooth operation, then the service life is extended, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that the metal clamp be made from thin stainless steel, changing the material parameters (thickness, material composition) to achieve both smooth operation and extended service life. The bounding bead geometry is also optimized to accommodate variations within standard manufacturing tolerances, balancing precision requirements with practical manufacturability.
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 effectively eliminates creaking noises by maintaining a secure and precise contact between the locking bolt and spring lip, ensuring a smooth operation and long service life with the use of thin stainless steel for the metal clamp.
Implementation Method 1
said spring lip reaching into the slotted guide and cushioning the locking bolt
Implementation Method 2
the metal clamp containing two flexible flanks... the flexible flanks of the metal clamp ensuring that the position, once assumed, is also reliably retained, as the respective flanks press against the body of the spring lip
Data Source
AI summary
The invention relates to a lock for a motor vehicle or a building, said lock being equipped with a rotary latch (2) rotatably supported in the lock housing (10) about a locking bolt (3), wherein the lock housing (10) has a slotted guide (8) for the locking bolt (3), said slotted guide having at least one spring lip (15) on the insertion side, which spring lip reaches into the slotted guide and cushions the locking bolt (3), said spring lip having creaking protection (17) that partially covers the surface (16) of the spring lip, wherein the spring lip (15) has a bounding bead (20) at the free end (18) and wherein the creaking protection (17) is designed as a sheet metal clamp (21) that can be attached to the spring lip (15) in front of the bounding bead with a preload.