Vehicle Door Handle Bowl Segmentation for Moldability
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Solution Overview
Problem
The complexity of designing vehicle door handles with bent recesses for electric door latch switches makes it difficult to manufacture without causing deformation, scratches, or breakage, as traditional molding processes struggle with steeply curved walls and undercuts.
Innovation Solution
The solution involves a vehicle door handle assembly comprising two complementary plastic parts: a lower-part bowl shaped like a bent pipe and a concave-shaped upper-part bowl, which are assembled together using clipping elements and a slideway, and can be permanently joined using welding or glue, allowing for a complex shape that mimics finger bending without the manufacturing challenges of traditional molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bowl's recess is bent to mimic finger bending for improved user comfort and aesthetics, then the user comfort and aesthetics are improved, but the manufacturing difficulty increases and the plastic part may break during demolding
Solution Approach 1:
The bowl is divided into two separate plastic parts: a bent pipe portion and a concave-shaped portion. Each part is molded separately using traditional molding processes, avoiding the need for complex single-piece molding. The bent pipe portion can be easily demolded, and the concave-shaped portion is assembled to it, combining manufacturing ease with the desired aesthetic shape.
Solution Approach 2:
The concave-shaped portion is inserted into the bent pipe portion, with the former fitting inside the latter. This nesting arrangement allows both parts to be assembled together to form the complete bowl structure, combining the advantages of separate molding with the appearance of a unified complex shape.
2Shape
If the bowl's recess is bent to hide the electric door latch switch, then the aesthetics are improved, but the manufacturing precision decreases due to demolding challenges
Solution Approach 1:
The bowl is segmented into two parts with different geometric characteristics. The bent pipe portion contains the steering curvature needed for aesthetics, while the concave-shaped portion houses the latch switch and provides the reception area. Each part is optimized for its specific function, allowing precise molding without demolding issues.
Solution Approach 2:
Different portions of the bowl have different geometric properties tailored to their specific functions. The bent pipe portion provides the aesthetic curvature and steering direction, while the concave-shaped portion provides the functional reception area. This local differentiation allows each part to be molded with high precision using appropriate molding techniques.
3Device complexity
If a single complex-shaped bowl is molded to provide both bending and concave features, then the device complexity is reduced, but the reliability decreases due to potential breakage during manufacturing
Solution Approach 1:
The bowl is divided into two simpler parts that can each be molded reliably using traditional processes. The bent pipe portion and concave-shaped portion are manufactured separately with high reliability, then assembled together. This segmentation eliminates the risk of breakage during demolding while maintaining the appearance of a complex unified structure.
Solution Approach 2:
Two separately molded plastic parts are combined through assembly to form the complete bowl structure. The bent pipe portion and concave-shaped portion are joined together to create the final aesthetic and functional shape, combining the reliability of simple molding processes with the complexity of the final design.
Data Source
AI summary
A vehicle door handle assembly includes a bowl disposed in an opening of a door panel, the bowl having a recess inside of which is disposed an electric door latch switch. The bowl includes two complementary plastic parts which are each obtained in a separate molding process. The two complementary plastic parts are a lower-part bowl that is shaped like a bent pipe and designed to be fastened to the door panel, and a concave-shaped upper-part bowl that is configured to be assembled to the lower-part bowl so that the concave-shaped upper-part bowl forms a concave-shaped reception wall serving as an abutment for fingertips of a user when inserted inside the recess of the bowl.