Spur Gears

Plastic Spur Gears

Spur gears are used in mechanical applications to increase or decrease the speed of a device or multiply torque by transmitting motion and power from one shaft to another through a series of mated gears. Spur gears are one of the most popular types of precision cylindrical gears. These gears feature a simple design of straight, parallel teeth positioned around the circumference of a cylinder body with a central bore that fits over a shaft. In many variants, the gear is machined with a hub that thickens the gear body around the bore without changing the gear face. The central bore can also be broached to allow the spur gear to fit onto a spline or keyed shaft.

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A plastic spur gear is a toothed wheel made up of engineering plastic materials that work with others to alter the relation between the speed of an engine and the speed of the driven parts. The engineering plastic materials used in manufacturing plastic gears can be nylon, essentially polyamide resin, and polyacetal.

Plastic Spur Gear Manufacturing Process

The machining process takes away material from a plastic block that is machined layer by layer in a manner that is precise to fabricate the desired part. Different machining processes manufacture plastic spur gears, usually milling or hobbing. These processes mentioned prior are the same machining processes used in manufacturing metal gears.
The meager cutting forces that permit high infeed rates reduce the manufacturing cost of the plastic gear. If high infeed rates are used during milling, this may result in a wavy and rough surface. This kind of surface may be seemingly detrimental to long performance. However, during a dry run-in period, the surfaces of the plastic teeth that bear the load are smoothened. The waviness may even offer lubricant pockets, but the waviness does not lower the quality of the gear. Plastic spur gears have a load-bearing surface that is somewhat pliable. This allows wider tolerances due to the elasticity of the plastic. The quality of the plastic spur gears can be reduced to two AGMA grades compared to steel gears. Compared to gears made of steel material, plastic spur gears have an increased backlash by one to two quality grades. This helps to allow for the effect of moisture and temperature on the plastic.

Characteristics of Machined Plastic Spur Gears

  • Machined plastic gears have a lower density, reduced weight, and lower inertia.
  • They require low maintenance.
  • They can absorb shock and vibration due to the pliable property of their material.
  • They produce less noise.
  • They have a low coefficient of fiction.
  • They are self-lubricating, and they are wear-resistant when running dry.
  • They have a more extended part of life.
  • They can be used in food preparation areas and wet environments.
  • They are corrosion-resistant.

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