Grease application method, application device, and methods for manufacturing worm-type reducer, electric power steering device, automobile and variety of industrial machines

A grease application device comprising:

• a drive unit configured to rotatively drive a member to be applied, and
• a nozzle having an opening arranged close to a concave-convex part formed on a circumferential surface of the member to be applied, and configured to apply grease which is discharged from the opening to the concave-convex part,
• wherein the grease is applied from the nozzle to the member to be applied, as a fluid of liquid or a fluid of gel phase,
• wherein the nozzle is provided to apply the grease to the concave-convex part while filling the grease into concave portions of the concave-convex part so that the grease is pushed into the concave portions;
• wherein a tip portion of the nozzle is formed with an inclined surface inclined relative to a central axis of the nozzle at an acute angle,
• wherein the opening of the nozzle is open towards the inclined surface, and
• wherein the grease is applied at a state where the opening of the nozzle closely faces the concave-convex part.