Hydraulic Piston Motor MSE02-2-123-R02-1240-5J00 MSE MSE02 MSE05

I. Core Technical Parameters
Basic specifications
Type: Inner curve multi-acting radial plunger hydraulic motor, MSE02 series specially designed for emulsion medium. 2 indicates the specification level, 123 is the displacement code, R02 is the rotation direction code, 1240 is the output shaft type, and 5J00 is a special function configuration
Nominal displacement: approximately 398ml/r (standard displacement of MSE02-2 series), and about 59.7L/min when the theoretical flow rate is 150r/min
Rated working pressure: 25MPa (250bar), short-term peak pressure up to 40MPa (400bar), suitable for medium and high-pressure heavy-load working conditions
Rated speed: 100r/min, short-term maximum speed can reach 180r/min, minimum stable speed ≤0.5r/min, it belongs to low-speed high-torque type motor
Output torque: approximately 1485N · m (at 25MPa pressure), maximum peak torque approximately 2376N · m (short time)
Output power: approximately 16kW (under rated conditions), maximum up to 25kW (for short periods)
Rotation direction: Standard clockwise (viewed from the shaft end), R02 indicates the standard rotation direction
Weight: Approximately 85kg (excluding accessories), compact structure, high power density
Working parameters
Volumetric efficiency: ≥92% (under rated conditions), with low energy conversion loss
Overall efficiency: ≥85%, with highly efficient comprehensive performance
Applicable medium: Emulsion (oil-in-water type, concentration 5-10%), particularly suitable for harsh environments such as underground coal mines. Anti-wear hydraulic oil (viscosity index ≥90) can also be used.
Medium viscosity: Emulsion 5-20mm²/s, hydraulic oil 10-300mm²/s, optimal working viscosity 20-60mm²/s
Medium temperature: -20℃ to +85℃, recommended working temperature: 30-55℃
Oil cleanliness: ISO 4406 18/15 grade. A 10μm precision filter must be installed to protect the precision componentsIi. Working Principle
The core working mechanism of the inner curve radial piston motor:
Structural features
It adopts an inner curve multi-acting radial plunger structure. The inner wall of the stator (CAM ring) has multiple evenly distributed special curved surfaces (usually 6-8 segments).
Multiple plunger holes are evenly distributed radially on the rotor, and each hole is equipped with a plunger and roller assembly
The distribution shaft is fixed and connected to the inlet and return oil ports, responsible for distributing high-pressure oil and low-pressure oil
The output shaft is rigidly connected to the rotor and bears the working torque
It adopts a special sealing design, suitable for emulsion media and harsh working environments
Principle of torque generation
The high-pressure emulsion enters the distribution shaft from the oil inlet and then passes through the distribution window into the bottom of the plunger in the oil inlet working section
The hydraulic pressure drives the plunger to move outward, and the rollers at the head of the plunger closely adhere to the inner surface of the stator
Due to the special curve on the inner surface of the stator, the extension length of the plunger at different positions varies, and the radial force generated is also different
The stator curve enables the plunger to complete multiple reciprocating motions within each revolution of the rotor (the number of actions is equal to the number of stator surface segments).
The radial force of the plunger is converted into a tangential force on the rotor through the rollers, thereby generating torque to drive the output shaft to rotate
Multiple plungers work in rotation to output continuous and stable torque, with torque fluctuations controlled within ±3%
Oil flow direction
High-pressure emulsion → Oil inlet → high-pressure window of the distribution shaft → Oil chamber at the bottom of the plunger → Push the plunger to move outward
The plunger moves → drives the rotor to rotate → the output shaft acquires torque
The plunger reaches the oil discharge working section → emulsion → low-pressure window of the distribution shaft → oil outlet → returns to the oil tank
The distribution shaft rotates synchronously with the output shaft to ensure that each plunger is connected to the high and low pressure oil in the correct position
Rotation direction control
By switching the direction of the oil inlet and return ports, the direction of the hydraulic pressure acting on the plunger is changed
The change in the direction of the hydraulic pressure causes the tangential component force to reverse, achieving the forward and reverse rotation function of the motor
The MSE02 series can be easily rotated in both directions through a directional control valve, meeting the requirements for vehicle forward and backward movement

Iii. Product Features and Advantages
1. Outstanding low-speed high-torque performance
Ultra-high starting torque: The starting torque efficiency is ≥92%, allowing direct starting under load without the need for no-load acceleration
Low-speed stability: It can operate smoothly without crawling at an ultra-low speed of 0.5r/min, making it suitable for precise control and fine-tuning
High torque output: The output torque of the same volume is 5 to 8 times that of a gear motor, making it suitable for heavy-duty applications
Small torque ripple: The uniform distribution of multiple plungers and the internal curve design keep the torque fluctuation within ±3%, ensuring extremely smooth operation
2. Compatibility and reliability of emulsion medium
Special sealing technology: Utilizing dedicated anti-emulsion sealing materials, it is water-resistant, oil-resistant, wear-resistant, and has a long service life
Anti-pollution ability: It has a strong tolerance to impurities in emulsions and is suitable for harsh environments such as underground coal mines
Rust and corrosion prevention: Key components undergo special surface treatment to resist the erosion of emulsions and humid environments
Adapt to harsh working conditions: It can withstand an instantaneous impact of 200% of the rated pressure and adapt to changes in road conditions and bumps
3. Advantages in structural and system compatibility
Force balance: The radial plungers are symmetrically distributed, which makes the radial forces cancel each other out, reduces the bearing load, and extends the service life
Modular design: Brakes, dual-speed functions, special seals, etc. can be selected as needed to enhance system integration
Multiple installation methods: We offer various flange and shaft extension forms to meet the interface requirements of different equipment
It can withstand radial and axial loads: With a tapered roller bearing structure, it can directly drive the load without additional support
Bidirectional rotation: The forward and reverse rotation can be easily achieved through the directional control valve, simplifying the design of the hydraulic system and adapting to various working conditions
4. Maintenance and Economy
Easy maintenance: Modular structure, main components can be replaced separately, reducing maintenance time by 50%
Long service life: Special materials and heat treatment processes ensure that the key friction pairs have a service life of over 10,000 hours
Energy consumption optimization: Maintain high efficiency under light load conditions and reduce system operating costs
Wide adaptability: It can operate within a temperature range of -20 ℃ to +85℃ and adapt to various environmental conditions

Iv. Usage Functions and Purposes
Core functions
Convert the pressure energy of the hydraulic system into mechanical energy to provide rotational power
Precisely control the output torque and rotational speed to meet the requirements of different working conditions
In coordination with the hydraulic control system, it realizes the automated production process
It is particularly suitable for hydraulic systems that use emulsion as the working medium
Main application fields
Coal mine machinery
Underground scraper conveyor drive, providing stable and high torque, suitable for damp and dusty environments
The traveling system of the roadheader provides reliable power under harsh working conditions
The hydraulic support push mechanism ensures the safety and efficiency of the working face support
It is particularly suitable for emulsion medium systems and meets the explosion-proof requirements in underground coal mines
Walking system for construction machinery
The walking drive for the chassis of small excavators and loaders provides strong traction and climbing ability
Roller drive wheels ensure uniform and smooth road surface construction
It provides smooth transitions when switching between high and low speeds and turning, reducing shock
Industrial conveying equipment
Roller drive for the metallurgical industry, suitable for high-temperature environments
Drive large belt conveyors in ports and mines to provide stable power
Provide reliable services in damp and dusty environments and reduce maintenance frequency
Ship and Ocean Engineering
Small vessel propulsion system, providing reliable power output
Drive for the offshore platform lifting system
It is adaptable to the corrosive environment of seawater, with reliable sealing and a long service life
Special vehicles
The tracked vehicle walking system provides powerful traction and off-road capability
The drive systems of special vehicles such as fire engines and rescue vehicles are suitable for complex terrains

V. Applicable Machines and Scenarios
1. Typical applicable machines
Coal mine scraper conveyor
It is particularly suitable for driving scraper conveyors with power ratings ranging from 200 to 500kW
Provide stable power under heavy loads, frequent starts and stops, and harsh environments
It is directly connected to the reducer, simplifying the transmission system and enhancing reliability
Adapt to the harsh working environment underground with high humidity and a lot of dust
Reduce maintenance frequency, minimize downtime and enhance production efficiency
Small excavator walking system
It is suitable for small excavators of 5 to 15 tons
As a walking motor, it provides strong traction and has a strong climbing ability (with a maximum climbing Angle of up to 30°)
Provide stable power output in muddy, rough and other harsh terrains
Coordinate with the working device to enhance the overall efficiency of the machine
The bidirectional rotation function enables the excavator to operate flexibly in narrow Spaces
Hydraulic support pushing system
It is applicable to the pushing and adjustment of hydraulic supports in fully mechanized mining faces of coal mines
Provide sufficient thrust (up to 1485N · m) to ensure the rapid and stable movement of the support
It is perfectly matched with the emulsion pump station system and meets the explosion-proof requirements underground
High reliability, reduced maintenance workload, and improved advancement efficiency of the working face
2. Characteristics of applicable scenarios
Emulsion medium system: Particularly suitable for oil-in-water emulsion (concentration 5-10%) working environments, such as underground coal mines
Heavy-duty working conditions that require low speed and high torque, such as scraper conveyors, lifting equipment, and large roller conveyors
Harsh working environments: damp, dusty, high or low temperature conditions, such as underground coal mines and metallurgical workshops
The working device of construction machinery that frequently starts, stops and changes direction responds quickly and has little impact
In medium and high-pressure application scenarios where the hydraulic system pressure is stable at 20-35 mpa, its high-pressure performance advantages are fully exerted
The equipment with limited space has a compact structure, high power density and is easy to install and arrange

Six. Similar models
1. Different specifications and models of the same series
MSE02-0: Displacement approximately 332ml/r, output torque about 1240N · m, power approximately 22kW, suitable for medium-sized load equipment
MSE02-1: Displacement approximately 255ml/r, output torque about 1128N · m, power approximately 18kW, suitable for light and medium loads
MSE02-3: With a larger displacement, higher output torque and power, it is suitable for heavy-duty load equipment
2. Different series models of the same type
MS02 series: It has the same basic structure as MSE02, but the MS series is suitable for mineral oil media, while the MSE series is suitable for emulsion media and has better anti-emulsification performance
MSE05 series: With a wider displacement range (500-800 mL /r), output torque up to 3000-4000N · m, and power up to 30-50kW, it is suitable for heavy construction machinery and coal mining equipment
MSE08 series: Larger displacement (800-1200ml/r), output torque up to 4000-6000N · m, power up to 50-70kW, suitable for super heavy equipment
3. Domestic alternative products
YMD series: Domestic internal curve radial piston motor, similar in performance to the MSE02 series, more economical in price, suitable for maintenance and matching in the domestic market
HNM series: Domestic low-speed high-torque hydraulic motors, with displacement ranges and performance parameters close to those of the MSE02 series, can be used as substitutes under certain conditions
JMDG series: Domestic radial piston motors, with parameters similar to the MSE02 series, have a significant price advantage and are suitable for application scenarios with limited budgets

Vii. Precautions for Use
1. Installation points
Direction confirmation
It must be installed in the specified direction (standard clockwise). The oil inlet and return ports must not be connected in reverse; otherwise, the internal seal and distribution mechanism will be damaged
The oil inlet is connected to the system pressure oil, the oil outlet is connected to the oil tank, and the oil drain is separately led back to the oil tank and not connected to the back pressure
For the emulsion system, ensure that the inlet and return oil pipelines are clean and free of impurities to avoid contamination
Fixation and connection
The installation plane must be flat (flatness < 0.1mm), and the fixing bolts should be evenly tightened (torque should meet the specified requirements) to prevent the shell from deforming and affecting the movement of the plunger
The output shaft and the load must be connected by an elastic coupling. Rigid connection is strictly prohibited
Coaxiality error is less than 0.05mm, angular deviation is less than 0.5°, reducing vibration and bearing load
The installation bracket must have sufficient rigidity to prevent vibration and displacement during operation
Pipeline configuration
The diameter of the oil inlet pipe should be no less than 32mm and the length less than 2m to reduce the oil suction resistance and prevent cavitation
The diameter of the oil outlet pipe should be ≥25mm to ensure smooth oil return and a back pressure of less than 0.5MPa
The drain pipe must be led back to the oil tank separately and not connected to back pressure to ensure the smooth discharge of the internal leaked emulsion
All pipelines must be firmly fixed to prevent vibration and wear
2. Startup and Operation management
Startup program
Check the oil tank level (≥ 300mm above the suction port) and the medium temperature (≥-10℃)
Manually turn the wheel 2 to 3 times to ensure there is no jamming
Loosen the exhaust plug, jog the start motor to exhaust, and then tighten it after continuous oil output
Start the machine without load and run it for 10 to 15 minutes to observe if there are any abnormal noises or leaks
Gradually load (each time ≤25% of the rated pressure, with an interval of ≥3 minutes). It is strictly prohibited to directly load the cold machine to full capacity
Operation monitoring
Oil temperature: Normal operating temperature is 30-55℃. If the temperature exceeds 70℃, the machine should be shut down to check the cooling system
Pressure: Not exceeding the rated value (25MPa), peak not exceeding 40MPa and cumulative time less than 10 minutes per hour
Noise: Smooth operation <85dB. Abnormal noise (>90dB) indicates possible wear or cavitation, and the machine should be stopped immediately
Leakage: Slight seepage (<10 drops per minute) is allowed. If the leakage increases, timely maintenance is required
Emulsion concentration: Regularly test the emulsion concentration (5-10% is recommended), and replenish it in time if it is insufficient
3. Maintenance and care
Daily inspection
Check the oil level, temperature, noise and leakage conditions every shift, and record the operating parameters
Check if the connecting bolts are loose and tighten them in time
Clean the surface of the motor to prevent the accumulation of oil stains from affecting heat dissipation
Check the pressure difference of the filter to ensure the filtration effect
Regular maintenance
Every 250 hours: Check the pressure difference of the filter (<0.15MPa), and replace the filter element if necessary
Every 500 hours: Check the contamination level and concentration of the emulsion. Take samples for testing or replenish the emulsion if necessary
Every 1000 hours: Replace the emulsion and clean the fuel tank and filter at the same time
Every 2000 hours: Comprehensive disassembly and inspection, measurement of key fit clearances, and replacement of worn parts (such as plungers and rollers)
Oil Product management
Emulsion must be prepared with special emulsified oil in the prescribed proportion (5-10%). Emulsified oils of different brands are strictly prohibited from being mixed
In cold regions, anti-freezing emulsions should be used to ensure low-temperature starting performance
Regularly test the concentration and pH value of the emulsion to ensure they meet the usage requirements
The cleanliness of the emulsion is of vital importance and the filter must be inspected and replaced regularly
4. Special Precautions
Prevent dry running
It is strictly prohibited to start the motor without medium. Even a short period of dry running will cause severe wear on the plunger and stator
After a long period of inactivity, when restarting the motor, clean emulsion should be filled into it
Before starting, it is necessary to confirm that the fuel supply system is working properly
Prevent cavitation
Ensure that the oil suction pipeline is well sealed to prevent air from entering the system and forming bubbles
The oil suction height should be less than 500mm, and it is recommended to be less than 300mm to reduce the oil suction resistance
When the oil temperature is too low (<10℃), run it no-load for 20 minutes first to increase the oil temperature before loading
For emulsion systems, prevent pump suction and pipeline leakage to avoid cavitation damage
Load matching
It is strictly prohibited to operate beyond the rated pressure and speed; otherwise, the service life will be significantly shortened
Avoid frequent overload impacts and protect the precision mating parts inside the motor
Theoretically, it is not allowed for the maximum torque and the highest rotational speed to occur simultaneously to avoid overload
Shutdown protection
Before shutting down, the oil should be unloaded to a low pressure (<20bar) and run for 5 to 10 minutes. Only when the oil temperature drops below 60℃ should the power be cut off
When the motor is not in use for a long time, the oil inlet and outlet ports should be sealed to prevent foreign objects from entering the interior
When the equipment is out of use for a long time in winter, anti-freezing measures should be considered to prevent the internal moisture from freezing and damaging the parts