• Dual Row Coaxiality — if the two bearing rows are not coaxial, the wheel wobbles periodically, the AGV drifts off a straight line and the tire wears unevenly. We hold 0.01 mm coaxiality by boring both seats in one clamping.
• Seal Groove Quality — the depth, width and bottom roughness of the dust lip groove and seal seat determine service life: Ra 0.8 bottom, depth ±0.03 mm, coaxiality 0.02 mm.
• Flange spigot and offset load — reducer output flange spigot coaxial with the bearing bore within 0.02 mm and face runout 0.01 mm, preventing extra bending load on the output shaft.
• Impact resistance — impact loads when an AGV crosses an obstacle reach 3 times the rated load, so the flange root gets an R4 fillet and a thickened transition to stop cracks starting there.
• Lightweight — aluminum is about 60% lighter than cast iron, directly improving AGV runtime and steering response.

AGV wheel assemblies vary widely, so hub bearing housings are essentially built to the whole machine.

• Bearing layout — double-row angular contact, tapered roller or paired deep groove bearings, selected by load and stiffness.
• Sealing Design — single or double lip seals, or labyrinth plus lip combinations, selected for dust and washdown conditions.
• Drive Interface — reducer spigot, hub bolt PCD and encoder mounting position matched to the drive unit.
• Material Options — aluminum for weight, ductile iron for damping and wear, 40Cr for fatigue strength.
• Validation Support — FEA recommendations for static load and obstacle impact, iterated with bench testing.

The drawings of a complete humanoid robot are often the core competitiveness of the next machine generation. We apply both physical and data isolation on a per-project basis.

• NDA First — mutual NDA and non-circumvention agreement signed before drawings are received.
• Isolated Secure Area — dedicated machines and staff, no photography and no phones inside the area.
• Not displayed — drawings, part photos and customer logos never enter sample cabinets, catalogs, the website or social media.
• Data Isolation — programs and models sit on an access-controlled server, destroyed at project end with a written record.
• Code-named — traveler cards and packaging labels use internal codes instead of customer part numbers.

Dongguan Changxinda Precision Technology Co., Ltd.Founded in 2008, with a team of 90-102 staff, serving 200+ Customers, export share 50-60%, annual sales of USD 10-20 million, ISO 9001:2015 certified.

Most hub rework traces back to seal grooves: 0.05 mm of groove depth error lets dust through, and a rough bottom wears the lip. We machine grooves and bearing seats in the same setup, so the relationship between groove and bore comes out right.

• Reserved Capacity — machine time is locked weekly for volume programs, so rush orders never displace batch schedules.
• Two shifts, six days a week — production runs 07:30-22:00, with weekend shifts added in peak season.
• Buffer Stock — semi-finished stock is held for repeat specifications, cutting repeat order lead time by about 30%.
• Visible Progress — weekly progress sheet plus shop floor photos, tracking number issued at shipment.
• Shipping — samples by express in 3-5 days, volume by air or sea, EXW / FOB Shenzhen / CIF.