The BMH Series Cycloidal Hydraulic Motor is a high-performance Low-Speed High-Torque (LSHT) orbital hydraulic motor designed for heavy-duty hydraulic drive applications. Utilizing an advanced Geroler gear set design, the BMH motor provides high torque output, excellent starting efficiency, smooth low-speed operation, and outstanding durability under high-load conditions.
The BMH Series is particularly suitable for applications requiring high torque at low speeds, such as construction machinery, agricultural equipment, mining machinery, forestry equipment, winches, conveyors, and industrial hydraulic drive systems.
| Type | BMH200 | BMH250 | BMH315 | BMH400 | BMH500 |
| Geometric displacement (cm3/rev) | 203.2 | 255.9 | 316.1 | 406.4 | 489.2 |
| Max.speed | rated (rpm) | 290 | 230 | 180 | 145 | 120 |
| cont. (rpm) | 366 | 290 | 236 | 183 | 155 |
| int. (rpm) | 439 | 348 | 282 | 220 | 184 |
| Max.torque | rated (N*m) | 400 | 500 | 600 | 705 | 670 |
| cont. (N*m) | 510 | 621 | 740 | 850 | 830 |
| int. (N*m) | 579 | 702 | 827 | 990 | 1040 |
| peak (N*m) | 651 | 790 | 980 | 1092 | 1170 |
| Max.output | cont. (Kw) | 16 | 16 | 14 | 12.5 | 11 |
| int. (Kw) | 18.5 | 18.5 | 15.5 | 15 | 14 |
| Max.pressuredrop | rated (Mpa) | 14 | 14 | 14 | 12.5 | 10 |
| cont. (Mpa) | 17.5 | 17.5 | 17.5 | 15.5 | 12.5 |
| int. (Mpa) | 20 | 20 | 20 | 19 | 16 |
| peak (Mpa) | 22.5 | 22.5 | 22.5 | 21 | 18 |
| Max.flow | rated (L/min) | 60 | 60 | 60 | 60 | 60 |
| cont. (L/min) | 75 | 75 | 75 | 75 | 75 |
| int. (L/min) | 90 | 90 | 90 | 90 | 90 |
| Weight (kg) | 10.5 | 11 | 11.5 | 12.3 | 13 |
Working Principle
The BMH Series hydraulic motor operates using a Geroler rotor-stator mechanism.
- Pressurized hydraulic oil enters the motor through the inlet port.
- The oil is distributed into the rotor-stator chambers.
- Pressure differences generate rotational movement of the rotor.
- The rotor drives the output shaft, converting hydraulic energy into mechanical power.
- Return oil exits through the outlet port and flows back to the hydraulic reservoir.
This design ensures efficient energy conversion, high torque generation, and smooth operation across a wide speed range.
Product Features
- Advanced Geroler gear set technology
- High starting torque and smooth low-speed operation
- High volumetric and mechanical efficiency
- Heavy-duty bearing design
- High radial and axial load capacity
- Stable performance under continuous operation
- Bi-directional rotation
- Compact structure with high power density
- Low noise and vibration
- Long service life with minimal maintenance
- Multiple mounting, shaft, and port options available
