Motor Vehicle Door Lock Bearing Trough for Low Friction Strength
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Solution Overview
Problem
Existing motor vehicle door locks face a challenge in reducing bearing friction while maintaining or increasing strength to absorb tearing forces during crashes, as reducing the bearing pin diameter compromises resistance torque and safety requirements.
Innovation Solution
The door lock design incorporates an open bearing trough in the support body to receive a bearing surface on a bearing pin, allowing a larger cross-section and increased resistance radius, while maintaining a smaller bearing radius for optimized friction and strength, with additional features like stops and guide surfaces for noise reduction and enhanced contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the bearing pin diameter is reduced to optimize friction conditions, then bearing friction is reduced, but the resistance torque against tearing forces is compromised
Solution Approach 1:
The invention separates the bearing pin into two functional segments: a smaller-diameter bearing surface portion that contacts the support body to minimize friction, and a larger-diameter structural portion that provides the necessary resistance torque against tearing forces. This segmentation allows each portion to be optimized for its specific function without compromise.
Solution Approach 2:
The bearing pin features local quality differentiation where the bearing surface has a smaller radius optimized for low-friction rotation, while the structural body maintains a larger cross-section for strength. This local differentiation enables the pin to simultaneously achieve low bearing friction and high resistance to tearing forces.
2Strength
If the bearing pin cross-section is increased to maintain strength, then resistance torque is improved, but bearing friction increases
Solution Approach 1:
The bearing pin is segmented into a bearing surface portion with smaller radius for low-friction contact and a structural portion with larger cross-section for strength. This segmentation resolves the contradiction by allowing the bearing contact area to be minimized while the overall pin strength is maintained.
Solution Approach 2:
The invention transitions from a uniform one-dimensional diameter specification to a multi-dimensional geometry where the bearing surface radius differs from the structural cross-section dimensions. This dimensional differentiation allows independent optimization of friction and strength properties.
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 design effectively reduces bearing friction while maintaining or increasing strength, ensuring the door lock can absorb tearing forces during crashes without compromising safety, and operates quietly with optimized friction conditions.
Implementation Method 1
the at least one locking mechanism part slides with a bearing surface along a fixed support body
Data Source
AI summary
A door lock, in particular a motor vehicle door lock, which is equipped with a locking mechanism that substantially consists of a rotary latch and at least one pawl. Each of the two locking mechanism parts is rotatably supported on a base about a respective axis. For this purpose, a bearing surface of each locking mechanism part slides along a fixed support body. According to the invention, the support body is provided with an open bearing trough for receiving the bearing surface.