Your four-wheelers top out at 35 km per hour while competitors hit 50. The standard differential vibrates itself loose at high RPM. Gears whine like a dental drill above 4,000 RPM. Customers return vehicles complaining about sluggish acceleration and embarrassing top speeds. We are Xuzhou Kehuan Electromechanical Equipment, a high speed electric four wheeler differential gearbox OEM supplier, and we designed the DB-04 high power 3KW
Electric Tricycle Differential Box for manufacturers who refuse to accept slow. Our reinforced spiral-bevel gear set and oversized tapered bearings handle 3,000W+ continuous input at speeds exceeding 50 km/h, giving your vehicles the acceleration and top-end performance that wins retail customers and fleet contracts.
Core Technical Specifications
- Rated Power: 2,000W - 3,000W continuous (peak 4,500W)
- Max Input Speed: 6,500 RPM
- Max Vehicle Speed: 50+ km/h depending on tire size and motor KV
- Rated Voltage: 48V / 60V / 72V (96V custom available)
- Peak Torque: 60 N.m to 120 N.m
- Gear Material: 20CrMnTi alloy steel with spiral-bevel profile for high-speed meshing
- Gear Precision: AGMA Class 10 for minimal vibration at high RPM
- Bearing System: Oversized tapered roller bearings rated for 8,000+ RPM
- Housing: Reinforced die-cast aluminum with external rib stiffeners
- Lubrication: Sealed-for-life with high-temperature synthetic grease (180C rated)
- Protection Level: IP56
- Service Life: 50,000+ km at sustained high-speed operation
- 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
- High-speed dynamometer capable of 8,000 RPM continuous load testing
- Vibration analysis laboratory with FFT spectrum analyzers for NVH optimization
- Every DB-04 unit run at 120% rated speed for 30 minutes before shipping
Customization Services
- Speed target: We optimize gear ratios for your exact motor KV and tire diameter to hit 40, 50, or 60 km/h
- Voltage range: 48V to 96V for high-power controllers
- Cooling options: Passive finned housing, forced-air cooling, or liquid-cooled jacket for extreme duty
- Gear ratios: 1:8 to 1:16 range depending on torque vs. speed priority
- Housing finish: Custom color or bare aluminum for your frame integration
- Programmable controller pairing: We supply matched controller with optimized speed-torque curves
- 3D modeling support and prototype validation within 2 weeks
- MOQ: 100 units per model for OEM orders
Real Customer Case Study: Brazilian Electric Utility Vehicle Manufacturer
Customer: Startup EV manufacturer in Sao Paulo producing electric utility quadricycles for gated communities and resort transport
Before Kehuan:
- Top speed with existing differential: 32 km/h (market demanded 45+ km/h)
- Gear whine above 3,500 RPM: 78dB, causing customer complaints
- Bearing failures at 8,000 km: 15% failure rate on test fleet
- Acceleration 0-30 km/h: 9.2 seconds (competitors achieved 6.5 seconds)
- Lost fleet contract: 200-unit order awarded to competitor because of speed requirement
- Engineering feedback: "We need a differential built for speed, not adapted from cargo trike parts."
After Switching to DB-04 (prototype validated, 250 units ordered):
- Top speed with DB-04: 51 km/h on 72V 3,000W system
- Gear noise at 5,500 RPM: 64dB (14dB reduction)
- Bearing condition after 15,000 km test: Within spec, zero wear measured
- Acceleration 0-30 km/h: 5.8 seconds
- Fleet contract won: 200-unit order for gated community shuttle fleet (speed requirement met)
- Retail price point maintained: No premium passed to customer despite performance gain
- Engineering director quote: "The DB-04 let us hit 50 km/h without redesigning our entire drivetrain. We went from losing bids to winning them in six months."
Key data point: The electric vehicle differential box max speed 50kmh claim on the DB-04 was validated on our high-speed dynamometer at 6,200 RPM under 120% rated torque for 50 continuous hours before the customer ever installed a unit.
Frequently Asked Questions
Q: What motor and controller do I need to reach 50 km/h with the DB-04?
A: Typical configuration: 72V 3,000W brushless DC motor with matching vector controller, paired with the DB-04-30 model. Exact speed depends on tire rolling diameter and total vehicle weight. Send us your motor spec sheet and vehicle curb weight and we calculate the exact gear ratio and predict your top speed within 24 hours.
Q: Will the higher speed reduce the service life compared to a standard cargo differential?
A: The DB-04 uses oversized bearings and spiral-bevel gears specifically rated for high-speed continuous operation. Under normal 45-50 km/h duty, expected service life is 50,000+ km. We do not recommend sustained operation above 55 km/h for more than 10 minutes without the optional forced-air cooling package.
Q: Can I buy the DB-04 as a retrofit kit for my existing low-speed vehicle platform?
A: Yes, we offer a complete retrofit package including the DB-04 differential, matched high-speed controller, and installation adapter plates for common frame designs. For the high power 3KW
Electric tricycle differential box retrofit, we recommend ordering a prototype kit first to validate fitment and speed before committing to a bulk order.
Build Vehicles That Win on Performance
Slow electric vehicles do not sell. The DB-04 gives your platform the speed and acceleration that customers actually want.
Request your prototype kit or bulk quote today:
