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BPG and BPGA precision planetary gear units share the same internal gearing and differ only at the output interface. BPG uses a solid output shaft for coupling through a keyed connection. BPGA uses a large output flange for direct bolt-on to driven equipment. Both use case-hardened and ground planetary gears with backlash <3 arcmin single-stage and <5 arcmin two-stage, delivering high torque density, smooth running and long service life on servo and stepper axes.
The internal gearing, backlash class, efficiency and torque ratings are identical. The only decision is whether the driven machine takes a shaft coupling or a bolt-on flange.
BPG units use a solid keyed output shaft. They couple through a coupling, a timing pulley or a pinion. Standard IEC motor flanges and hollow input shaft allow direct bolt-on to servo or stepper motors.
BPGA units use a large output flange instead of a shaft. They bolt directly to the driven hub, gear or tooling, removing the coupling and shortening the drivetrain. Torque ratings match the equivalent BPG size.
BPG/BPGA frames cover 060 to 180 with single-stage ratios 3–10 and two-stage ratios 15–100. The bar length below shows the relative rated torque level for each frame size at single-stage ratio.
Full parameter table for the standard BPG/BPGA range. BPGA shares the same internal gearing and torque ratings, with output flange instead of output shaft.
| Model | Stage | Ratio Range | Rated Torque (Nm) | Max Torque (Nm) | Backlash (arcmin) | Efficiency (%) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| BPG-060 | 1 | 3 – 10 | 25 | 50 | < 3 | 97 | 1.8 |
| BPG-060 | 2 | 15 – 100 | 25 | 50 | < 5 | 94 | 2.1 |
| BPG-090 | 1 | 3 – 10 | 80 | 160 | < 3 | 97 | 4.5 |
| BPG-090 | 2 | 15 – 100 | 80 | 160 | < 5 | 94 | 5.2 |
| BPG-115 | 1 | 3 – 10 | 200 | 400 | < 3 | 97 | 9.8 |
| BPG-115 | 2 | 15 – 100 | 200 | 400 | < 5 | 94 | 11.5 |
| BPG-142 | 1 | 3 – 10 | 450 | 900 | < 3 | 97 | 18.0 |
| BPG-142 | 2 | 15 – 100 | 450 | 900 | < 5 | 94 | 21.0 |
| BPG-180 | 1 | 3 – 10 | 1000 | 2000 | < 3 | 97 | 38.0 |
| BPG-180 | 2 | 15 – 100 | 1000 | 2000 | < 5 | 94 | 44.0 |
Standard IEC motor flanges with hollow input shaft for direct coupling to servo or stepper motors. Custom flanges for other motor brands available.
Filled with high-grade synthetic lubricant and sealed against contamination. No oil change is required during normal service life.
Standard single-stage <3 arcmin, two-stage <5 arcmin. Ultra-precision single-stage <1 arcmin available on request for high-precision axes.
BPG/BPGA precision planetary gear units are used where a servo or stepper motor needs more torque, lower output speed and repeatable positioning on general to high-precision axes.
Articulated arms, SCARA robots and collaborative robots on joint axes.
CNC milling, turning and grinding axes, plus tool changers and turrets.
High-speed labelling, cartoning and rotary printing press drive axes.
Rotary tables, indexing drives and pick-and-place heads.
Surgical robots, imaging stages and diagnostic machinery requiring precise motion.
Actuators and servo systems for flight control and ground support equipment.
Every BPG/BPGA unit is inspected for gear tooth geometry, hardness, backlash, noise, vibration and load performance before packing. Material certificates and third-party inspection are available on request.
ISO 9001:2015 certified quality management from raw material to final assembly. Products comply with DIN and AGMA gear standards.
Common questions about BPG vs BPGA, backlash, motor compatibility and service life.
Provide rated torque, peak torque, required output speed, backlash class, output interface (shaft or flange) and servo motor drawing. Raydafon will confirm the correct frame, ratio and adapter, and reply with a factory-direct quotation within 24 hours.
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Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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