Motor Vehicle Door Lock Holder Structure for Crash Load Resistance
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Solution Overview
Problem
Existing lock holders for motor vehicle door locks struggle to absorb the increased loads, particularly in hybrid or electric vehicles, due to the higher weight of batteries, leading to material deformations and tears, especially at the transition from the lock holder bracket to the lock holder plate, and fail to adequately absorb the forces during accidents.
Innovation Solution
The lock holder is designed with a separate locking bolt and connecting bolt, featuring a conical enlargement and material thickening to increase the contact surface, allowing individual adaptation to extreme loads, and includes a plastics coating for noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lock holder is made with conventional design and material thickness, then the manufacturing cost and simplicity are maintained, but the load capacity and tear resistance are insufficient for hybrid/electric vehicle weights
Solution Approach 1:
The lock holder is divided into separate components: a lock holder plate and a lock holder bracket that can be positively connected. This segmentation allows each component to be optimized independently for strength while maintaining manufacturing feasibility, resolving the contradiction between increased load capacity and structural complexity.
Solution Approach 2:
The lock holder bracket is designed with a locally thickened region at the transition zone to the lock holder plate. This local quality enhancement provides increased strength and tear resistance exactly where the highest stresses occur during accidents, without requiring uniform thickening throughout the entire structure, thus balancing strength requirements with manufacturing simplicity.
2Reliability
If the lock holder bracket is positively connected with material thickening, then the tear resistance at the transition zone is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The lock holder bracket is pre-formed with the thickened region integrated into its structure before assembly. This preliminary action ensures the thickened region is already in place to provide tear resistance, eliminating the need for additional post-assembly operations and maintaining ease of manufacture while achieving the required reliability.
3Strength
If the connecting pin is compressed to ensure positive connection, then the connection strength between bracket and plate is improved, but material deformations and tears may occur
Solution Approach 1:
The thickened region of the lock holder bracket serves as a cushioning element that absorbs and distributes the compression forces during assembly. This beforehand cushioning prevents stress concentration that would lead to material deformation or tears, while still ensuring adequate connection strength between the bracket and plate.
Data Source
AI summary
The invention relates to a lock holder (1) for a motor vehicle door lock comprising a lock holder plate (2), a locking bolt (3), a center piece (4) and a connecting bolt (5), the lock holder (1) comprising a separate locking bolt (3) and a separately formed connecting bolt (5).