D-94-172270-91 Presser Foot Lifting Gear

The D-94-172270-91 Presser Foot Lifting Gear is a dedicated helical gear transmission component designed for sewing equipment, crafted from high-quality 20CrMnTi alloy structural steel. It is specifically engineered to meet the power drive requirements of the presser foot lifting mechanism in sewing machines.

This gear features a pressure angle of 20°, a module of 1, 72 teeth, and a helix angle of 11°30′. With an inner diameter of φ8mm, an outer tooth diameter of 75.475mm, an overall length of 17.6mm, and a single-piece weight of 0.0838kg, its structural dimensions are precisely tailored to match the stroke of the presser foot lifting motion. It is manufactured through a multi-step precision process flow, including normalizing – turning – heat treatment – shot blasting – blackening – reaming – injection molding – turning – hobbing – deburring – surface capping. After heat treatment and blackening, the gear surface achieves enhanced hardness and corrosion resistance. The injection molding and surface capping processes further optimize the protective performance of the component, while hobbing ensures high tooth profile accuracy, guaranteeing smooth meshing with the transmission system. This product can stably drive the lifting and lowering actions of the presser foot in sewing equipment, adapting to high-frequency operating conditions, and serves as a key component of the presser foot lifting mechanism in sewing machinery.