Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of bmm hydraulic motor in China, also supports customized service. If you're going to wholesale high quality bmm hydraulic motor made in China, welcome to get pricelist from our factory.
BMM Hydraulic Motor - Compact Orbital Motor for Light-to-Medium Duty
The BMM is a cycloidal hydraulic motor. Some people call it an orbital motor. Same thing.
Inside, a gerotor set-inner gear, outer gear, one less tooth on the inside-turns oil flow into rotation. The chambers fill, rotate, exhaust. Smooth, steady, even at low speeds.
What does that mean in practice? High starting torque. Low-speed stability. Compact size. And it doesn't cost a fortune.
This is a motor for light-to-medium work: conveyors, mixers, irrigation systems, valve actuators, small construction attachments. If you need a simple, reliable hydraulic motor that fits in a tight space, the BMM hydraulic motor is worth a look.
Where it fits in the motor family
Three types of hydraulic motors cover most applications:
Gear motors - cheap, simple, but poor at low speed. They stall.
Piston motors - efficient, powerful, but expensive. Overkill for many jobs.
Cycloidal motors (BMM) - good low-speed performance, decent torque, fair price. The middle ground.
If you need high speed and low cost, a gear motor works. If you need maximum efficiency and high pressure, a piston motor is better. If you need smooth low-speed operation without paying piston motor prices, the BMM hydraulic motor is the right tool.
Product description
Six ways to think about this motor
1. What displacement do I need?
Depends on your speed and torque. Small displacement-8 to 12.5 ml/r-gives you higher speed, lower torque. Large displacement-40 to 50 ml/r-gives you lower speed, higher torque.
If you're not sure, tell us your speed and torque requirements. We'll recommend one.
2. What pressure and flow can it handle?
Continuous pressure: 7 to 10 MPa depending on displacement. Intermittent: up to 14 MPa. Flow: 16 to 20 L/min continuous, up to 25 L/min intermittent.
Higher pressure gives more torque. Higher flow gives more speed. Both have limits-don't exceed the ratings.
3. What's the difference between continuous and intermittent?
Continuous is what the motor can do all day. Intermittent is what it can do for short bursts-no more than 10% of each minute. Run it at intermittent ratings too long, and you'll shorten its life.
4. How do I install it?
Mount it on a standard flange-round or square, depending on your configuration. Keyed shaft or splined shaft, whichever fits your coupling. Standard hydraulic ports-check the drawing for your specific model.
5. What about back pressure?
The motor can handle up to 10 MPa back pressure at the case drain, but we recommend keeping it below 5 MPa. Higher back pressure will push oil past the shaft seal. If back pressure is high, install a separate case drain line back to the reservoir.
6. What about maintenance?
Keep the oil clean. Change the oil and filter regularly. Watch the temperature-max 80°C. Run it in before full load-1 hour at 40% of max pressure.
About us
Shijiazhuang Laiye Import & Export Trading Co., Ltd., part of Hebei Onederful® Hydraulic Technology Co., Ltd., has been making hydraulic components since 1988-over 35 years.
We're a factory, not a trading company. Around 200 employees. Full in-house production: casting, machining, assembly, testing, phosphating. We control the whole process.
Products go to Russia, Europe, the Middle East, South America, and Asia. ISO 9001 certified. Every valve is tested individually, with data linked to its serial number. OEM customization, technical support, and a 12-month warranty come standard.
Packaging and Transportation
Factory workshop
Exhibition
FAQ
Q: What type of hydraulic motor is BMM?
A: BMM is a type of cycloidal hydraulic motor, which is a low-speed high-torque motor and is suitable for light to medium-duty hydraulic applications. It features a cycloidal gear pair design, ensuring smooth operation and excellent starting torque.
Q: What mounting and shaft extension options are available for the BMM?
A: A variety of standard configurations are available-including flange mounting, shaft extensions, and port options-facilitating integration into existing equipment.
Q: What causes excessive motor noise or noticeable vibration?
A: Possible causes: excessive system pressure pulsation, poor coupling alignment or looseness, air entrainment in the oil, or internal motor wear. Troubleshooting: Check the stability of the pump source and bleed out any air.
Q: What causes insufficient torque or a drop in rotational speed in the BMM motor?
A: Check the system pressure, the oil pump's output flow, and the piping for blockages or leaks. If there are no issues with the system, the problem may be internal motor wear leading to increased internal leakage.
Q: What causes oil leakage at the BMM shaft seal?
A: Common causes include excessive case drain back-pressure, shaft seal aging, and reversed oil port connections that subject the shaft seal to direct internal pressure. If back-pressure is too high, the shaft seal may begin leaking within one minute of startup; a case drain line must be installed and routed separately back to the reservoir.
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