The Main Data

• Description: Ship lift gear rack
• GEARX No.: CR62-470H
• Module: 62 mm
• No. of teeth: 24
• Pressure angle: 20°
• Material: G35CrNiMo6-6+QTI DIN EN 10293
• Heat treatment: Through quenching and tempering, tooth surface induction hardened
• Hardness of rack body: HB260-300,
• hardness of tooth surface: HRC≥50
• Case hardening depth(CHD): 6～9 mm
• Length: 4,705 mm
• Height: 492 mm
• Face width: 810 mm mm 810
• Rack width: 1,160 mm
• Tooth surface finish:
  • Gear milling by special milling cutter
  • Dedendum milling by special milling cutter
• Accuracy grade: DIN10a27
• Weight of gear blank: 24,500 kg
• Weight of rack: 11,300 kg

Applications

• Vertical ship lift system

The Main Fabrication Procedure

• Upon request

Technical Documents

• Inspection certificate of material
• Heat treatment certificate
• Certificate of ultrasonic inspection with grade II
• Magnetic particle detection certificate(on tooth flank)
• Size tolerance and geometric tolerance report
• Inspection report of tooth quality

Relative Standard

• 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