Your passengers are covering their ears. Your drivers complain of ringing after an 8-hour shift. The city tourism board just issued a noise complaint because your fleet roars through historic streets at 80 decibels. Standard differentials were built for cargo, not people. We are Xuzhou Kehuan Electromechanical Equipment, and we engineered the DB-02 low noise electric passenger tricycle differential gearbox specifically for operators who carry people, not pallets. Our helical-cut 20CrMnTi gears and precision-lapped contact surfaces hold noise below 65dB even at full passenger load, turning every ride into a conversation-friendly experience that keeps tourists happy and regulators satisfied.
Core Technical Specifications
- Noise Level: Less than or equal to 65dB at 1 meter under full load (ISO 3744 tested)
- Rated Voltage: 48V / 60V / 72V (custom 24V-72V available)
- Rated Power: 500W - 1,500W
- Peak Torque: 25 N.m to 45 N.m
- Gear Material: 20CrMnTi alloy steel with helical profile and lapped contact surfaces
- Gear Precision: AGMA Class 9+ tolerances for minimal backlash vibration
- Housing: Die-cast aluminum with internal sound-dampening ribs
- Protection Level: IP54
- Service Life: 80,000+ km with noise degradation less than 3dB
- Working Temperature: -25C to +45C
- Warranty: 12 months against manufacturing defects
Why Choose Us
Factory Strengths
- ISO9001:2015 certified since 2016 with full MES + ERP digital management
- National High-Tech Enterprise recognized by the Chinese government
- 13 years focused exclusively on electric vehicle drivetrain components
- Over 1,000 direct customers across 30+ countries
- In-house NVH testing laboratory with calibrated sound-level meters per IEC 61672
- Helical gear grinding technology developed jointly with Guilin University of Electronic Technology
- Every DB-02 unit undergoes a 15-minute no-load noise test before leaving the factory
Customization Services
- Noise target: We can tune for 60dB, 55dB, or even 50dB depending on your application
- Voltage range: 24V to 72V tailored to your passenger vehicle motor
- Gear ratios optimized for sightseeing speed (15-25 km/h) or campus shuttle speed (20-30 km/h)
- Connector types and cable lengths adjusted to your frame layout
- Logo branding and custom packaging for your tourism fleet
- Color-matched housing (white, black, or custom RAL code) to blend with your vehicle design
- 3D modeling support and prototype validation within 2 weeks
- MOQ: 100 units per model for OEM orders
Real Customer Case Study: European Coastal Sightseeing Fleet
Customer: Electric sightseeing trike operator serving historic districts and waterfront promenades in Dubrovnik, Croatia
Before Kehuan:
- Fleet noise level at driver ear position: 78-82dB during acceleration
- Tourist complaints about engine noise: 34 complaints per month
- Driver turnover rate: 45% annually (cited noise-induced fatigue as primary reason)
- City heritage board warnings: 2 formal noise violation notices
- Average trip rating on review platforms: 3.8 out of 5 stars (noise mentioned in 62% of negative reviews)
- Operating hours restricted: 10:00 AM - 6:00 PM only (no early morning or evening tours)
After Switching to DB-02 (48 units deployed):
- Fleet noise level at driver ear position: 61-64dB during acceleration
- Tourist complaints about noise: Zero in 12 months
- Driver turnover rate: Dropped to 12% annually
- City heritage board: Operating permit renewed with no restrictions, commendation letter issued
- Average trip rating: 4.7 out of 5 stars ("peaceful ride" mentioned in 48% of positive reviews)
- Operating hours expanded: 7:00 AM - 10:00 PM approved, increasing daily revenue by 40%
- Fleet operator quote: "We paid a slight premium for the DB-02, but the extended operating hours alone added 180,000 euros to our annual revenue. The drivers no longer wear earplugs."
Key data point: The quiet electric trike
Rear Axle differential for sightseeing performance was validated in our NVH lab against ISO 3744 standards before shipment, then re-verified by the customer's acoustic engineer on-site in Dubrovnik.
Frequently Asked Questions
Q: How is the 65dB noise level measured and can you provide a test report?
A: We measure noise per ISO 3744 at 1 meter from the differential housing under full-load continuous operation at rated speed. Every DB-02 batch includes an NVH test report with frequency spectrum analysis. For orders over 200 units, we can arrange third-party acoustic testing by SGS or Intertek at no extra cost.
Q: Will the DB-02 work with my existing passenger trike motor and controller?
A: Yes. The DB-02 is compatible with standard brushless DC motors rated 48V-72V and most sine-wave or vector controllers used in passenger applications. We particularly recommend pairing it with our controller for the quietest possible operation. Send us your motor specifications and we confirm fitment within 24 hours.
Q: Can I order a small batch with my company logo and custom housing color?
A: OEM branding starts at 100 units per model. We offer laser-etched logos on the housing, custom RAL color powder coating, and branded packaging. For the
Electric Tricycle Differential Box noise level below 65db guarantee, we recommend ordering a single sample unit first for acoustic validation in your specific vehicle before committing to a bulk order.
Give Your Passengers the Silent Ride They Expect
Noise complaints are costing you reviews, drivers, and operating permits. The DB-02 is built for operators who sell experiences, not just transportation.
Request your sample unit or bulk quote today
