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Precision Plastic Gears for Automotive

Precision Plastic Gears for Automotive

moulded with the tooth profile, bore position and hub geometry repeating shot to shot, verified on T1 before production release.

Precision Plastic Gears for Automotive

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Product Overview Specifications Related Custom Services

Product Overview

We mould injection moulded gears, so the tooth profile, the bore position and the hub geometry repeat from the first shot to the last. Against a machined gear, a moulded gear runs quieter because the tooth flank is formed rather than cut, needs no secondary tooth operation, and can carry the hub, the web, the snap features and the shaft bore in one part.

Material is selected to your drawing and the duty the gear has to survive. The grades below are the ones we run most often for this kind of gear, and any of them can be quoted — we confirm the choice with you at DFM rather than assuming it.

Gear types

  • Spur gear discs with knurled rim and rib-reinforced web
  • Helical gears with upper and lower hub bosses
  • Worm shafts and multi-start worm gear pairs
  • Double gears, planet gears and pinion gears
  • Internal ring gears and gear segments

Tooling and process

  • Gear parameter check and mould flow simulation before steel is cut
  • Cavity steel NAK80 or S136, 1 to 16 cavities, hot or cold runner
  • Tooth form verified on the T1 samples before production release
  • Mould life 500,000–1,000,000 shots with maintenance

Materials

POM, PA66, PBT and PEEK. POM gives the lowest friction and the best dimensional stability, PA66 and PA66+GF30 carry load and heat, PEEK is used where the gear runs hot and dry.

Material is selected to your drawing. The grades listed are the ones we run most often for this type of part; we confirm the choice at DFM rather than assuming it.

Specifications

ParameterValue
Gear typesSpur, helical, worm, planet, double, internal and segment gears
MaterialSelected to your drawing. We run POM, PA66, PBT and PEEK for this kind of part and confirm the grade with you at DFM.
Modulem0.5 to m3 typical; larger modules quoted on request
AccuracyTooth profile and bore position verified on T1; grade confirmed at DFM against your drawing
ShrinkagePOM 1.8%, PA66 1.8%, PP 1.6% — applied to the tooth form as well as the body
Cavity layout1 to 16 cavities, set by annual volume and press size
Core and cavity steelNAK80 (HRC 38±2) or S136 (HRC 50±2)
Tool life500,000–1,000,000 shots on hardened inserts
InspectionCMM and gear tooth check on T1 and per batch on request

Related Custom Services

  • Overmolding a soft-touch or wear layer onto the gear body
  • Insert molding of a metal shaft or bush into the gear hub
  • Two-shot molding of a gear with a different material web
  • CNC machining of sample gears before the tool is cut

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Product Overview

Product Overview

We mould injection moulded gears, so the tooth profile, the bore position and the hub geometry repeat from the first shot to the last. Against a machined gear, a moulded gear runs quieter because the tooth flank is formed rather than cut, needs no secondary tooth operation, and can carry the hub, the web, the snap features and the shaft bore in one part.

Material is selected to your drawing and the duty the gear has to survive. The grades below are the ones we run most often for this kind of gear, and any of them can be quoted — we confirm the choice with you at DFM rather than assuming it.

Gear types

  • Spur gear discs with knurled rim and rib-reinforced web
  • Helical gears with upper and lower hub bosses
  • Worm shafts and multi-start worm gear pairs
  • Double gears, planet gears and pinion gears
  • Internal ring gears and gear segments

Tooling and process

  • Gear parameter check and mould flow simulation before steel is cut
  • Cavity steel NAK80 or S136, 1 to 16 cavities, hot or cold runner
  • Tooth form verified on the T1 samples before production release
  • Mould life 500,000–1,000,000 shots with maintenance

Materials

POM, PA66, PBT and PEEK. POM gives the lowest friction and the best dimensional stability, PA66 and PA66+GF30 carry load and heat, PEEK is used where the gear runs hot and dry.

Material is selected to your drawing. The grades listed are the ones we run most often for this type of part; we confirm the choice at DFM rather than assuming it.

Specifications

Specifications

ParameterValue
Gear typesSpur, helical, worm, planet, double, internal and segment gears
MaterialSelected to your drawing. We run POM, PA66, PBT and PEEK for this kind of part and confirm the grade with you at DFM.
Modulem0.5 to m3 typical; larger modules quoted on request
AccuracyTooth profile and bore position verified on T1; grade confirmed at DFM against your drawing
ShrinkagePOM 1.8%, PA66 1.8%, PP 1.6% — applied to the tooth form as well as the body
Cavity layout1 to 16 cavities, set by annual volume and press size
Core and cavity steelNAK80 (HRC 38±2) or S136 (HRC 50±2)
Tool life500,000–1,000,000 shots on hardened inserts
InspectionCMM and gear tooth check on T1 and per batch on request
Related Custom Services

Related Custom Services

  • Overmolding a soft-touch or wear layer onto the gear body
  • Insert molding of a metal shaft or bush into the gear hub
  • Two-shot molding of a gear with a different material web
  • CNC machining of sample gears before the tool is cut
Precision Plastic Gears for Automotive
moulded with the tooth profile, bore position and hub geometry repeating shot to shot, verified on T1 before production release.
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