Drive component development

Synchronous pulley + bearing + shaft + expanding sleeve + roller + gear + synchronous pulley

Part brand:
1. Synchronous pulley - novlion
2. Axis - novlion
3. Expansion sleeve - novlion
4. Gear - novlion
5. Roller - novlion
6. Bearing -- imported NTN; NSK; garrock Chinese products; domestic products customers need to specify brands
7. Synchronous belt -- imported optebelt, domestic Fulong or Jaguar

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