BMP Hydraulic Orbital Motor

Shandong Heqi Hydraulic Machinery Equipment Co., Ltd., formerly known as Jining Gongcheng Hydraulic Machinery Factory, was founded in 1999. Since its establishment, it has been supplying hydraulic parts for Eaton Company. The quality index of its products has always been among the best among all suppliers of Eaton Company, and it has been awarded the honor of excellent quality supplier for many years.

BMP hydraulic orbital motor is a kind of high performance hydraulic motor, which is widely used in the power transmission system of various mechanical equipment. This motor uses a double rolling bearing design, has a greater lateral load capacity, can adapt to a variety of working conditions, and has a very good performance. At the same time, it also uses high-quality materials and processes to ensure the efficiency, stability and reliability of the motor.

Gear motor: In order to adapt to the forward and reverse requirements in the structure, the inlet and outlet of the gear motor is equal and symmetrical, and there is a separate oil leakage port, which can lead the oil leakage of the bearing part out of the shell. In order to reduce the starting friction moment of the motor, rolling bearings are used; The gear hydraulic motor has more teeth than the pump, also to reduce torque pulsation.

Vane motor: Due to the pressure oil action, the force imbalance causes the rotor to generate torque. The output torque of the vane hydraulic motor is related to the pressure difference between the displacement of the hydraulic motor and the inlet and outlet of the hydraulic motor, and its speed is determined by the flow size of the input hydraulic motor. Since hydraulic motors generally require forward and reverse, the blades of vane hydraulic motors should be placed radially.

Radial piston motor: It is divided into single-acting connecting rod type radial piston motor, multi-acting internal curve piston motor, plunger type high-speed hydraulic motor.

Axial piston motor: In addition to the valve type distribution, other forms of axial piston pump can be used as hydraulic motors in principle, that is, axial piston pumps and axial piston motors are reversible. The instantaneous total torque generated by the axial piston motor is pulsating. If the motor pressure oil input direction is changed, the motor shaft rotates clockwise. The change in the inclination angle of the swashplate a, that is, the change in displacement, affects not only the torque of the motor, but also its speed and steering. The greater the inclination angle of the swashplate, the greater the torque generated and the lower the speed.

Oil Leak of the Hydraulic Orbital Motor
● Shaft end oil leakage: Due to the constant friction between the oil seal and the output shaft in the daily use of the motor, it will inevitably lead to the wear of the contact surface between the oil seal and the shaft. If it exceeds a certain limit, the oil seal will lose its sealing effect and cause oil leakage. Treatment: need to replace the oil seal, if the output shaft wear serious, need to replace the output shaft at the same time.
● Oil leakage at the cover: The "O" ring under the cover is crushed or aged and loses the sealing effect. The probability of this situation is very low. If it happens, just replace the "O" ring.
● Oil leakage of motor crevice: The "O" ring between the motor housing and the front side plate, or between the front side plate and the stator body, or between the stator body and the rear side plate is aged or crushed. If this happens, just replace the "O" ring.

The Hydraulic Orbital Motor Runs Weakly
● The stator body pair is too loose: As the motor is in operation, all parts inside the motor are in the state of friction with each other. If the hydraulic oil quality in the system is too poor, the wear of the internal parts of the motor will be accelerated. When the wear of the pin in the stator exceeds a certain limit, the internal clearance of the stator body pair will become larger, and the normal sealing effect can not be achieved, resulting in excessive internal leakage of the motor. The symptom is that the motor works normally without load, but the sound will be slightly louder than normal, and it will be weak or slow under load. The solution is to replace the needle column.
● Wear between the output shaft and the housing: The main reason for the fault is that the hydraulic oil is impure and contains impurities, which leads to the groove inside the housing, then leads to the increase of motor internal leakage, which leads to motor weakness. The solution is to replace the housing or the whole pair.

Large Leakage of Hydraulic Orbital Motor
● The clearance between the output shaft and the housing is too large: When the clearance between the output shaft and the housing is greater than the standard, the leakage of the motor will be significantly increased (more obvious than that described in reason 1). Solution: Replace the output shaft with a new one and match it with the housing.
● The use of too large diameter "O" ring: Too thick "O" ring will make the plane of parts can not fit normally, there is a large gap, resulting in increased motor leakage. This situation is very rare, the solution is to replace the "O" ring that meets the specification.
● The fastening screw is not tightened: If the fastening screw is not tightened, the plane of the part can not fit normally, and there is a certain gap, which will make the motor leak greatly. The solution is to tighten the screws within the specified torque range.

The Hydraulic Orbital Motor Doesn't Work or Crawls
● The matching clearance of stator body pair plane is too small: As mentioned before, the plane clearance of stator body of BMR series motor should be roughly controlled in the range of 0.03mm-0.04mm. If the clearance is less than 0.03, the orbital wheel may bite the front side plate or the rear side plate, and the motor will be found operation is uneven, serious situation will make the motor directly bite, leading to no rotation. Processing method: grind the plane of orbital wheel to make the plane clearance between orbital wheel and stator body within the standard range.
● Tightening the fastening screws too tight: Tightening the fastening screws too tightly will cause the parts and the plane to fit too tightly, As a result, the motor does not run smoothly or directly stuck. The solution is to tighten the screws within the specified torque range.
● Bite between the output shaft and the housing: When the fit clearance between the output shaft and the housing is too small, the motor will bite or crawl, also this will happen when the hydraulic oil contains impurities. The only way to deal with it is to replace the output shaft and match the housing.

Lubrication: Proper lubrication is essential for the smooth functioning of hydraulic orbital motors. Lubricants reduce friction, wear, and heat generation within the motor. The specific lubrication requirements vary depending on the hydraulic orbital motor type, size, and application. Follow the manufacturer's guidelines regarding the type of lubricant, the frequency of lubrication, and the recommended lubrication points.

Cleaning: Regular cleaning helps remove dirt, dust, and debris that can accumulate on the hydraulic orbital motor's external surfaces and ventilation openings. Inspect the hydraulic orbital motor regularly and clean it as necessary. Avoid using excessive water or harsh cleaning agents that could damage the motor's components.

Bearing Maintenance: Bearings are critical components of hydraulic orbital motors, and proper maintenance is essential. Check the bearings regularly for signs of wear, overheating, or noise. Lubricate the bearings according to the manufacturer's recommendations. If any issues are detected, consult the manufacturer's guidelines or consider engaging a professional technician for bearing replacement or repair.

Regular Testing and Monitoring: Implement a comprehensive testing and monitoring program for hydraulic orbital motors. This may include electrical tests, such as insulation resistance, winding resistance, and surge testing, to assess the motor's electrical health. Additionally, consider using thermal imaging to identify hotspots and temperature anomalies. Regular monitoring helps identify potential issues early and allows for timely maintenance and repairs.