Main Data

• Description: Alloy steel Internal gear segment
• GEARX No.: SGS10-7.1GB
• Module: 10 mm
• No. of teeth: 17
• Degrees covered: 7.1°
• Pressure angle: 20°
• Material: 42CrMo
• Heat treatment: Through quenching and tempering
• Tooth hardness: HB260-280
• Tip Diameter: 4317.02 mm
• Reference diameter: 4307.02 mm
• Root diameter: 4294.52 mm
• Face width: 65 mm
• Tooth surface finish: Grinding
• Accuracy grade: DIN 7
• Weight of gear blank: 28 kg
• Weight: 20.5 kg

Application

• Aircraft manufacturing

The Main Fabrication Procedure

• Single 7.1° sector rough machining, 1 mm allowance
• Stress relieving
• WEDM

Technical Documents

• Inspection certificate of material
• Heat treatment certificate
• Size tolerance and geometric tolerance report
• Inspection report of tooth

Ralative Standards

• DIN 3961 Tolerance for cylindrical gear teeth; bases
• DIN 3962 Tolerance for cylindrical gear teeth
  • Part 1 Tolerance for diviations of individual parameter
  • Part 2 Tolerance for tooth trace deviations
  • Part 3 Tolerance for pitch-span deviations
• DIN 3967 Tooth thickness allowances
  • Tooth thickness tolerances
  • Principles