BM Series — Orbital Hydraulic Motors
Short Description:
BM Series orbital hydraulic motors are compact LSHT motors for mobile, agricultural, construction and industrial equipment with flexible configuration options.
BM Series orbital hydraulic motors are compact LSHT motors for mobile, agricultural, construction and industrial equipment with flexible configuration options.
| Selection Item | BM Series Option / Range | Selection Note |
|---|---|---|
| Motor principle | Gerotor / geroler orbital design | Provides compact LSHT output with smooth low-speed rotation. |
| Displacement | Multiple displacement options | Higher displacement increases torque but lowers speed for the same flow. |
| Output speed | Based on flow and displacement | Flow rate is the main driver of motor rpm. |
| Output torque | Based on displacement and pressure | Working pressure and pressure drop decide usable torque. |
| Shaft options | Keyed, splined, straight, tapered or custom | Must match coupling, sprocket, pulley or machine interface. |
| Mounting | SAE flange, wheel flange, square flange or custom | Controls interchangeability and installation envelope. |
| Ports | Side, rear or custom port orientation | Should match hose routing and installation clearance. |
| Seal options | Standard or high-pressure shaft seal choices | Important for case pressure, contamination and outdoor service. |
| Typical fluids | Standard anti-wear hydraulic oils | Oil cleanliness, viscosity and temperature affect life and efficiency. |
Engineering Notes
- Check both continuous and peak pressure, not only maximum advertised pressure.
- Radial shaft load should be reviewed when using sprockets, pulleys or chain drives.
- Low oil cleanliness can quickly reduce motor efficiency and service life.
- For holding loads, use a brake or valve arrangement instead of relying on motor leakage alone.
Typical Applications
- Agricultural machinery: seeders, sprayers, mower decks, augers, harvesters and feed systems.
- Construction attachments: sweepers, trenchers, compact drilling attachments and small rotary tools.
- Material handling: conveyors, rollers, turntables, reels and indexing systems.
- Marine and fishing equipment: net haulers, small capstans and auxiliary deck drives.
- Forestry and utility machines: brush cutters, tensioners, cable reels and small pulling devices.
- Industrial hydraulic systems: compact rotary drives where electric motors are difficult to install.
Best-Fit Buyer Profile
BM Series motors are best for OEMs, repair companies and hydraulic system integrators who need a compact LSHT motor matched to a specific shaft, flange, port and displacement requirement.
Request a Technical Recommendation
For a fast recommendation, send the required torque, target speed, available pressure and flow, shaft/flange drawing, port requirement and duty cycle to jw.luo@jst-hydraulic.com or WhatsApp +86 186 6857 0723.
Detailed selection notes, FAQ, comparison tables and related guide links are kept here for buyers who need deeper technical information.
BM Series orbital hydraulic motors are compact low-speed high-torque motors for mobile, agricultural, construction and industrial hydraulic equipment. Based on the gerotor/geroler principle, BM motors provide smooth rotation, high starting torque and flexible mounting options in a lightweight package.
Why Choose BM Series Orbital Hydraulic Motors
- Compact LSHT output: low-speed high-torque performance in a small motor envelope.
- Smooth low-speed control: suitable for conveyors, augers, sweepers, winches, reels and rotary attachments.
- Flexible configurations: displacement, shaft, flange, port, seal and mounting options can be matched to the hydraulic circuit.
- Cost-effective hydraulic drive: a practical choice when the application needs reliable torque without a large piston motor.
- Easy machine integration: compact structure helps OEMs fit hydraulic drive into limited installation space.
- Multiple duty options: configurations can be selected for continuous rotation, intermittent duty, outdoor service or mobile equipment.
How to Select a BM Orbital Hydraulic Motor
Correct motor selection depends on required torque, target speed and the hydraulic power available from the machine. Send the following data for accurate recommendation:
- Required output torque: starting torque, running torque and peak load decide motor displacement and pressure margin.
- Target speed: rpm is mainly determined by hydraulic flow and motor displacement.
- Working pressure: continuous pressure and peak pressure affect service life, sealing and bearing load.
- Available flow: low-flow and high-flow circuits require different displacement choices.
- Shaft load: radial and axial load from sprockets, pulleys or direct-mounted wheels must be checked.
- Mounting interface: flange type, shaft type, port orientation and available space should match the machine design.
- Hydraulic oil and environment: viscosity, temperature, contamination level and outdoor conditions affect seal and bearing selection.
BM vs Radial Piston Hydraulic Motors
BM orbital motors are usually chosen for compact size, economical cost and moderate-duty LSHT applications. For heavier shock loads, ultra-low speed stability or high continuous torque, see QJM Series Motors, JNM Series Motors or JHM Series Motors.
Common Custom Options
- Different displacements for speed or torque priority
- Straight, keyed, splined or tapered shaft options
- SAE, wheel, square or custom mounting flanges
- Side ports, rear ports or special port orientation
- High-pressure seals and shaft seal options
- Integrated brake or valve options for selected applications
- Custom paint, labeling and OEM packaging
Related Hydraulic Drive Products
BM motors can be used with compact winches, reels and rotating attachments. For winch assemblies, see NJ Series Hydraulic Winches and JSJ Series Hydraulic Winches. For final drive assemblies, see JST Series Wheel Drives.
FAQ
What is an orbital hydraulic motor?
An orbital hydraulic motor is a low-speed high-torque motor using gerotor or geroler gear geometry to convert hydraulic pressure and flow into rotary motion.
How do I choose the right displacement?
Displacement is selected from required torque, available pressure, target speed and available flow. Larger displacement usually gives more torque at lower speed.
Can BM motors replace Danfoss, Eaton or other orbital motors?
In many projects, JST can compare displacement, shaft, flange, port and performance requirements to recommend a compatible BM configuration.
What information is needed for quotation?
Send displacement or target torque/speed, working pressure, flow, shaft and flange dimensions, port type, rotation direction, duty cycle and working environment.
Related Motor and Winch Resources
- NJ Series compact hydraulic winches using compact hydraulic motor drive
- JSJ Series hydraulic winches for custom heavy-duty winch assemblies
- QJM Series radial piston hydraulic motors for higher-torque heavy-duty drive systems
- Hydraulic winch selection guide for marine equipment
Related Winch Drive Resources
- Hydraulic winch vs electric winch: selection guide
- NJ Series compact hydraulic winches using compact LSHT drive
- JSJ Series hydraulic winches for heavy-duty hydraulic winch assemblies
- QJM Series radial piston hydraulic motors for higher-torque winch drive systems