Sawtooth Plastic-Metal Connection for Fuel Injection Valves

The patent replaces traditional welding or mechanical fastening methods with a press connection system featuring sawtooth-like structures. The metal component's sawtooth structures penetrate and deform the plastic elastically during pressing, creating a secure connection without chip formation. This substitution of the joining mechanism eliminates the harmful chips while achieving reliable connection security against loosening and rotation.

The patent changes the geometric parameters of the connection surfaces by introducing sawtooth-like structures with specific tooth profiles, heights, and spacing. These parameter changes enable the metal structures to penetrate and deform the plastic in a controlled manner during pressing, creating a secure connection that prevents both loosening and rotation while avoiding chip formation.

The patent employs asymmetric sawtooth-like structures where the metal component's teeth have specific asymmetric profiles that penetrate and deform the plastic in a unidirectional manner. This asymmetry provides mechanical interlocking that prevents both loosening and rotation, while the pressing action remains simple and chip-free. The asymmetric tooth geometry ensures secure connection without complicating the assembly process.

The patent incorporates curved or rounded features in the sawtooth structure design, particularly in the tooth profiles and interaction surfaces. These curvature elements enable smooth elastic deformation of the plastic during pressing while maintaining secure mechanical interlocking. The curved geometry facilitates simple assembly while ensuring connection security against loosening and rotation.

The patent uses asymmetric sawtooth structures that inherently prevent rotation through their unidirectional tooth profiles. The asymmetric geometry creates mechanical interlocking that resists rotational forces without requiring additional anti-rotation features. This approach achieves rotation prevention while maintaining simple component design and assembly procedures.

The patent combines the connection function and rotation prevention function into a single integrated press connection system with sawtooth structures. By merging these functions into one mechanism rather than using separate components, the design achieves both secure connection and rotation prevention without increasing overall device complexity.