Sumitomo Bevel Buddybox® BBB4 Right-Angle Speed Reducers
The Sumitomo Bevel Buddybox® BBB4 Series (featured model: YNHM2-6135Y-B-87 1.5 kW 1:87 Ratio) is Sumitomo's high-torque, heavy-duty right-angle speed reducer platform, designed specifically for demanding material handling, mining conveyors, wastewater agitators, and bulk processing equipment. Uniquely combining a **shock-resistant Cyclo® input speed reduction stage** with a **high-efficiency spiral bevel gear output stage**, BBB4 reducers deliver **500% momentary shock load resistance** without gear teeth breakage. Constructed with all-ductile iron housings for ultimate structural rigidity, these units eliminate the need for expensive motor bedplates or fluid couplings. Available with hollow output shafts utilizing the patented **Taper-Grip® keyless bushing system** (enabling easy shaft mounting and fretting corrosion prevention) as well as solid output shafts and C-face motor adapters. Covering output torques from 250 Nm up to 18,000 Nm across reduction ratios from 11:1 to 26,000:1, Sumitomo BBB4 speed reducers serve as the direct 1-to-1 mechanical upgrade for legacy **Sumitomo BBB2 and BBB3** right-angle drives.
Technical Specifications
| Featured Model | YNHM2-6135Y-B-87 (Size B BBB4, 1.5 kW Motor Input, 1:87 Gear Ratio, Hollow Shaft with Taper-Grip® Bushing) |
|---|---|
| Brand / Manufacturer | Sumitomo Drive Technologies (Sumitomo Heavy Industries) |
| Product Series | Bevel Buddybox® BBB4 Series Right-Angle Cycloidal Speed Reducers |
| Housing Frame Sizes Covered | Size A, Size B, Size C, Size D, Size E, Size F, Size G (All-Ductile Iron Construction) |
| Output Torque Range | 250 Nm to 18,000 Nm (2,210 lb-in to 159,300 lb-in Continuous Output Torque) |
| Reduction Ratio Range | 11:1 to 320:1 (Double Reduction); Multi-Stage Ratios up to 26,000:1 |
| Shaft Mounting Options | Taper-Grip® Keyless Bushing (Hollow Shaft), Keyed Hollow Shaft, Solid Output Shaft, Flange Mount |
| Shock Load Capacity | 500% Momentary Overload Capacity via Rolling Cycloidal Discs; IP55 / IP65 Enclosure Options |
Documentation & Resources
Sumitomo Bevel Buddybox BBB4 Frame Size & Torque Selection Matrix
Complete selection matrix for Sumitomo Bevel Buddybox BBB4 right-angle reducers. Review frame sizes, Cyclo input sizes, allowable output torques, and standard model naming conventions:
| BBB4 Frame Size | Cyclo Input Frame Size | Max Output Torque (Nm) | Available Ratio Range | Sumitomo Model Code Example | Shaft Bore Options |
|---|---|---|---|---|---|
| Size A | 6105Y / 6125Y | 550 Nm | 11:1 - 320:1 | YNHM1-6105Y-A-29 | Taper-Grip® / Keyed Hollow |
| Size B | 6125Y / 6135Y | 1,200 Nm | 11:1 - 320:1 | YNHM2-6135Y-B-87 | Taper-Grip® / Keyed Hollow |
| Size C | 6145Y / 6155Y | 2,500 Nm | 11:1 - 320:1 | YHHM3-6145Y-C-43 | Taper-Grip® / Keyed Hollow |
| Size D | 6165Y / 6175Y | 4,800 Nm | 11:1 - 320:1 | YHHM5-6165Y-D-59 | Taper-Grip® / Keyed Hollow |
| Size E | 6185Y / 6195Y | 8,500 Nm | 11:1 - 320:1 | YHHM10-6185Y-E-87 | Taper-Grip® / Keyed Hollow |
| Size F & G | 6205Y - 6245Y | 12,000 - 18,000 Nm | 11:1 - 320:1 | YHHM15-6205Y-F-43 | Heavy Duty Taper-Grip® |
Legacy Sumitomo Bevel Buddybox BBB2 / BBB3 to BBB4 Replacement Guide
Direct replacement guide for upgrading older Sumitomo BBB2 and BBB3 drives to current BBB4 series right-angle reducers with 100% mechanical interchangeability:
| Legacy Sumitomo BBB Model | Legacy Torque & Frame Size | Current BBB4 Series Equivalent | Key Upgrades & Operational Advantages |
|---|---|---|---|
| Sumitomo BBB2 Size A / B | 500 Nm - 1,100 Nm | Sumitomo BBB4 Size A / Size B 100% Direct Drop-In | Upgraded ductile iron housing, increased thermal rating, optimized Taper-Grip® hub. |
| Sumitomo BBB3 Size C / D | 2,200 Nm - 4,500 Nm | Sumitomo BBB4 Size C / Size D 100% Direct Drop-In | 500% shock load protection, leak-free oil sealing system, identical shaft center height. |
| Sumitomo BBB3 Size E / F | 8,000 Nm - 11,500 Nm | Sumitomo BBB4 Size E / Size F 100% Direct Drop-In | Heavy ductile iron casting withstands extreme mechanical stress in mining conveyors. |
Expert Technical Sourcing & System Integration Notes
When replacing older Sumitomo BBB2/BBB3 right-angle reducers on heavy belt conveyors, bucket elevators, wastewater agitators, or screw feeders, switching to current BBB4 series speed reducers delivers immediate operational advantages: complete elimination of keyway fretting corrosion via Taper-Grip® bushings, 500% shock load protection via rolling Cyclo® discs, ductile iron housing strength, and complete physical interchangeability without altering torque arm reaction brackets or drive shafts. Simply provide us with your existing reducer nameplate serial number or complete model designation (e.g., YNHM2-6135Y-B-87 or YFHM3-6145Y-C-43), and our technical engineering team will deliver a 100% compliant replacement specification and proposal.
Core Benchmark Model Standard Configurations
- YNHM1-6105Y-A-29 (Size A 0.75 kW)
- YNHM2-6125Y-A-43 (Size A 1.5 kW)
- YNHM2-6135Y-B-87 (Size B 1.5 kW)
- YHHM3-6145Y-C-43 (Size C 2.2 kW)
- YHHM5-6155Y-C-59 (Size C 3.7 kW)
- YHHM5-6165Y-D-59 (Size D 3.7 kW)
- YHHM10-6175Y-D-87 (Size D 7.5 kW)
- YHHM10-6185Y-E-87 (Size E 7.5 kW)
- YFHM3-6145Y-C-43 (C-Face Adapter Input)
- YFHM5-6165Y-D-59 (C-Face Adapter Input)
- Sumitomo BBB4 Size A Reducer
- Sumitomo BBB4 Size B Reducer
- Sumitomo BBB4 Size C Reducer
- Sumitomo BBB4 Size D Reducer
- Sumitomo BBB4 Size E Reducer
- Sumitomo Taper-Grip® Bushing Kit
- Sumitomo BBB4 Ductile Iron Gearbox
- Sumitomo Right-Angle Cyclo-Bevel
- Sumitomo Conveyor Drive Reducer
- Sumitomo BBB3 to BBB4 Replacement
