Rotary Hydraulic Motor

What is Rotary Hydraulic Motor?

A rotary hydraulic motor is a device that converts hydraulic energy into mechanical energy. It achieves output torque and rotation speed through the movement between one or more rotors and a housing. This motor plays the role of an actuator in a hydraulic system, converting the liquid pressure energy provided by a hydraulic pump into mechanical energy, thereby generating output torque and rotation effects. Rotary hydraulic motors are widely used in various fields, including but not limited to injection molding machinery, ships, hoists, engineering machinery, construction machinery, coal mining machinery, mining machinery, metallurgical machinery, petrochemicals, port machinery, etc.

Advantages of Rotary Hydraulic Motor

High power-to-weight ratio
Hydraulic motors have a high power-to-weight ratio, which means they can generate a lot of power while being relatively lightweight. This makes them ideal for applications that require high power output but have weight limitations, such as mobile equipment.

High torque at low speeds
Hydraulic motors can generate high torque even at low speeds, making them ideal for heavy-duty applications that require high pulling or lifting force.

Reversible operation
Hydraulic motors can operate in both directions, allowing for reversible operation of the driven equipment. This is useful in applications such as winches and cranes.

Wide speed range
Hydraulic motors can operate at a wide range of speeds, from very low to very high, making them versatile and adaptable to various applications.

4Tons Rotary Hydraulic Motor
A 4tons rotary hydraulic motor is a device that converts hydraulic energy into mechanical energy. It achieves output torque and rotation speed through the movement between one or more rotors and a...
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3Tons Rotary Hydraulic Motor
A 3tons rotary hydraulic motor is a device that converts hydraulic energy into mechanical energy. It achieves output torque and rotation speed through the movement between one or more rotors and a...
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1Tons Rotary Hydraulic Motor
A 1tons rotary hydraulic motor is a device that converts hydraulic energy into mechanical energy. It achieves output torque and rotation speed through the movement between one or more rotors and a...
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1 Tons Rotary Hydraulic Motor
Rotation: Unlimited
Max axial load static, KN(lbf): 10(2250)
Max axial load dynamic, KN(Ibf): 5(1125)
Torque at 25Mpa(3625psi), Nm(lb ft): 350(258)
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3Tons Rotary Hydraulic Motor
Rotation: Unlimited
Max axial load static,KN(lbf): 10(2250)
Max axial load dynamic,KN(Ibf): 5(1125)
Torque at 25Mpa(3625psi),Nm(lb ft): 350(258)
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4Tons Rotary Hydraulic Motor
Rotation: Unlimited
Max axial load static,KN(lbf): 45 (10118)
Max axial load dynamic,KN(Ibf): 25(5621)
Torque at 25Mpa(3625psi),Nm(lb ft): 1100(811)
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5Tons Rotary Hydraulic Motor
Rotation: Unlimited
Max axial load static,KN(lbf): 55(12367)
Max axial load dynamic,KN(Ibf): 25(5621)
Torque at 25Mpa(3625psi),Nm(lb ft): 1300(959)
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6Tons Rotary Hydraulic Motor
Rotation: Unlimited
Max axial load static,KN(lbf): 60(13491)
Max axial load dynamic,KN(Ibf): 30(6745)
Torque at 25Mpa(3625psi),Nm(lb ft): 1800(1328)
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10Tons Rotary Hydraulic Motor
Rotation: Unlimited
Max axial load static,KN(lbf): +100(22485)-80(17985)
Max axial load dynamic,KN(Ibf): +50(11242)-40(8992)
Torque at 25Mpa(3625psi),Nm(lb ft): 2500(1844)
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11Tons Rotary Hydraulic Motor
Rotation: Unlimited
Max axial load static,KN(lbf): +100(22485)-80(17985)
Max axial load dynamic,KN(Ibf): +50(11242)-40(8992)
Torque at 25Mpa(3625psi),Nm(lb ft): 2500(1844)
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12Tons Rotary Hydraulic Motor
Rotation: Unlimited
Max axial load static,KN(lbf): +120(26982)-90(20236)
Max axial load dynamic,KN(Ibf): +60(11242)-45(8992)
Torque at 25Mpa(3625psi),Nm(lb ft): 2900(2139)
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16Tons Rotary Hydraulic Motor
Rotation: Unlimited
Max axial load static,KN(lbf): +160(35976)-90(20236)
Max axial load dynamic,KN(Ibf): +80(17988)-45(10118)
Torque at 25Mpa(3625psi),Nm(lb ft): 3400(2500)
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Why Choose Us

Our product

The main products of our company are cycloidal hydraulic motor, and we also produce supporting products like hydraulic winch, hydraulic brake, hydraulic rotary reducer, hydraulic parallel valve, hydraulic steering gear, hydraulic oil pump.

Our equipment

As a professional manufacturer of hydraulic components in china, our company is committed to the development of high-tech products and manufacturing technology. We have cnc forming grinder, cnc internal grinder, cnc external grinder, cnc lathe, cnc milling machine, cnc gear hobbing machine.

Production market

Our company has the right to import and export goods and technology, and our products exported to the united states, turkey, germany, malaysia, britain, italy, poland, thailand and other 10 countries and regions.

Our service

We have professional sales and technical team to listen to customer's needs at any time, and to meet your requirement on price and quality at our best.

Working Principle of Rotary Hydraulic Motor

Rotary hydraulic motor work the same way as hydraulic pumps, and they both convert energy by sealing the solvent change of the working chamber. Rotary hydraulic motor is a low-speed torque multi-action motor, referred to as cycloidal motor, by the difference between a tooth of the internal meshing cycloidal pin column planetary transmission mechanism, the use of a tooth difference planetary reducer principle, so this motor is a high-speed hydraulic motor and deceleration unit combined with a vulgar large torque hydraulic components. All kinds of combine harvesters, seeders, rotary cultivators, lawn mowers, sprayers in agriculture; net lifters in fisheries; winding machines, textile machines, printing machines, and business washing machines in light industry; road rollers, cement mixers, sweepers in the construction industry; these devices can be powered by rotary hydraulic motor. Rotary hydraulic motor are hydraulic motors made of internal meshing cycloidal gears using a similar principle to planetary reducers (less tooth difference principle). The rotor and stator are a pair of gear pump cycloid needle teeth meshing gear, the rotor has z (zi = 6/8) teeth of the short outer cycloidal line isometric line tooth shape, the stator has z: = zi + 1 arc needle tooth tooth shape, the rotor and stator form 22 closed interdental closed chambers, of which half are in the high pressure area, half in the low pressure area.

Differences Between Rotary Hydraulic Motor and Pumps

It is important to know and understand how hydraulic pumps and motors differ from each other. Hydraulic pumps and motors operate similarly to each other to such an extent that some people do not know the differences. Some use the word pump when in effect they are talking about a motor and vice versa.

Some of the differences between hydraulic motors and hydraulic pumps include:

Hydraulic motors can operate in either direction. Hydraulic motors have mechanisms that allow them to rotate in either direction (negative or positive rotation) are required to have positive and negative rotation, which is why their internal structure is symmetrical, and hydraulic pumps generally rotate in a single direction, so that requirement is not necessary.

For example, in a vane motor, the blades can only be arranged in a radial manner. It can not be inclined like a vane pump, because this will cause the blades to be broken when reversing. The distribution plate in the axial plunger motor is supposed to have a symmetrical design, in that case, the axial plunger of the pump is not; the gear motor should have a separate leakage tube.

Hydraulic pumps are mainly used when they are connected with a prime mover and motors are connected with loads. The pump in essence has no radial loads such as pulleys, sprockets, belts which can be found in hydraulic motors.

In hydraulic pumps, there is a vacuum that is created by low pressure whereas in hydraulic motors there is no requirement for their operation.
Hydraulic motors have a wide speed range, and when choosing lubrication and bearing form this should be satisfied.

In hydraulic motors the minimum stable speed is low. Other hydraulic motors can only be used effectively with variable speeds and brakes.
Hydraulic motors require a big start-up torque for them to overcome friction.

For the same type of motor and pump the internal leakage is higher in the hydraulic motor than in the pump.

Some hydraulic motors can work without slippers to reduce friction whereas hydraulic pumps cannot work without slippers.

Components Of Rotary Hydraulic Motor

Housing

The housing is the outer shell of the motor that contains the internal components. It is typically made of cast iron or aluminum, and its design varies depending on the type of motor.

Shafts and gears

The shafts and gears transmit the rotational force from the motor to the driven equipment. They are typically made of high-strength steel or alloy, and their size and shape depend on the type and size of the motor.

Seals and bearings

Seals prevent hydraulic fluid from leaking out of the motor and contaminants from entering. Bearings support the shafts and gears and reduce friction during operation. These components are typically made of synthetic rubber, plastic, or metal.

Inlet and outlet ports

The inlet and outlet ports are the openings in the housing that allow hydraulic fluid to enter and exit the motor. The size and location of these ports vary depending on the type of motor.

Mounting flange

The mounting flange is the part of the housing that attaches the motor to the equipment. It is typically bolted or welded to the equipment.

Drainage and breather ports

Drainage and breather ports allow air and fluid to escape from the motor during operation. They prevent the buildup of pressure and reduce the risk of damage to the motor.

Control valves

Control valves regulate the flow and pressure of hydraulic fluid entering the motor. They allow for precise control over the speed and torque of the motor.

How to Choose Rotary Hydraulic Motor

Type of motor: There are several types of hydraulic motors, including gear, vane, and piston motors. Each type has unique features and advantages, and the choice depends on the specific requirements of the application.

Power requirements: The power requirements of the application, including the required speed and torque, should be considered when selecting a hydraulic motor. It is important to choose a motor that can provide the required power without being over or undersized.

Operating conditions: The operating conditions of the application, including the temperature, pressure, and environment, should be considered when selecting a hydraulic motor. The motor should be able to operate safely and reliably under the specific conditions of the application.

Efficiency: The efficiency of the hydraulic motor should be considered, as it can affect the operating costs and energy consumption of the application. It is important to choose a motor that is efficient and can provide the required power with minimal energy consumption.

Control options: The control options for the hydraulic motor should be considered, as they can affect the precision and accuracy of the driven equipment. The motor should be compatible with the required control options, such as flow rate and pressure control, and electronic controls.

Maintenance requirements: The maintenance requirements of the hydraulic motor should be considered, including the frequency of maintenance, the type of maintenance required, and the availability of spare parts. The motor should be easy to maintain and repair to ensure reliable operation and minimize downtime.

Cost: The cost of the hydraulic motor should be considered, including the initial cost and the operating costs over the lifespan of the motor. It is important to choose a motor that provides the required performance at a reasonable cost.

Application of Rotary Hydraulic Motor

Construction equipment

Hydraulic motors are commonly used in construction equipment such as excavators, loaders, and bulldozers to provide high torque and power for digging, lifting, and moving heavy loads.

Agriculture equipment

Hydraulic motors are used in agriculture equipment such as tractors, harvesters, and sprayers to power various functions such as plowing, harvesting, and spraying.

Material handling equipment

Hydraulic motors are used in material handling equipment such as conveyor systems, cranes, and hoists to provide precise control over the movement and positioning of heavy loads.

Marine equipment

Hydraulic motors are used in marine equipment such as winches, steering systems, and propulsion systems to provide high torque and power in harsh marine environments.

Aerospace equipment

Hydraulic motors are used in aerospace equipment such as aircraft landing gear and control surfaces to provide precise control and reliable operation.

Industrial equipment

Hydraulic motors are used in various industrial equipment such as machine tools, presses, and pumps to provide precise control over the movement and positioning of parts.

Mobile equipment

Hydraulic motors are commonly used in mobile equipment such as trucks, buses, and trains to provide power for various functions such as steering, braking, and lifting.

Installation And Maintenance Of Rotary Hydraulic Motor

Selecting the right motor: Consider the specific requirements of your application, including torque, speed, and operating conditions, to choose the appropriate hydraulic motor.
Mounting: Follow the manufacturer's instructions to mount the motor securely, ensuring proper alignment and adequate support.
Fluid connections: Connect the motor to the hydraulic system, paying attention to correct hose size, fittings, and seals to prevent leaks.
Filtration: Install appropriate filtration systems to maintain clean hydraulic fluid and protect the motor from contaminants.

Initial startup and testing

Fluid level check: Verify the hydraulic fluid level and ensure it meets the manufacturer's specifications.
System priming: Purge air from the hydraulic system and motor by cycling the fluid through the system several times.
Load testing: Gradually introduce the motor to the operational load, monitoring performance and addressing any anomalies.

Routine maintenance

Regular inspections: Conduct visual inspections of the motor, checking for leaks, loose fittings, or abnormal wear.
Lubrication: Follow the manufacturer's guidelines for lubrication intervals and use the recommended lubricants to ensure proper motor function.
Filter maintenance: Clean or replace hydraulic filters as recommended to prevent clogging and maintain optimal fluid quality.
Temperature monitoring: Monitor the motor's operating temperature and take necessary measures if it exceeds the specified limits.

Troubleshooting and repair

Noise and vibration: Investigate and address any unusual noise or excessive vibration, which may indicate mechanical issues or misalignment.
Leakage: Identify and repair any hydraulic fluid leaks promptly to prevent damage to the motor and the surrounding components.
Performance issues: If the motor exhibits reduced power or efficiency, conduct a thorough inspection to identify the root cause and rectify it.
Seal replacement: Over time, seals may wear out and require replacement. Follow the manufacturer's instructions for proper seal replacement procedures.

Our Factory

Shandong luke hydraulic technology co., ltd., founded in 2020, is a professional enterprise engaged in the technical development, manufacturing and marketing of cycloidal hydraulic components.The company takes innovation as the development direction of the company, while constantly absorbing the essence of foreign technology. Our business philosophy is "people-oriented, internationalization, informatization, marketization, scientization and standardization". The enterprise spirit "science and technology, industry pioneer", and service aim "create products, customer first ", create the vigorous vitality of luke hydraulic.

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FAQ

Q: What is the difference between a rotary actuator and a rotary hydraulic motor?

A: A rotary actuator may take elements from either cylinders or motors to create rotational force, also known as torque. The difference between a rotary actuator and a motor is the former rotates around a limited arc, while a motor may rotate infinitely. There are two common types of rotary actuators.

Q: What is the rotation of a rotary hydraulic motor?

A: Rotary hydraulic motor rotation is determined by viewing the motor from the shaft end while pressurizing the a port and observing shaft rotation.

Q: What is a limited rotation hydraulic motor and how does it differ from a hydraulic motor?

A: Hydraulic motors can be of the limited rotation or the continuous rotation type. A limited rotation motor, which is also called a rotary actuator or an oscillating motor, can rotate clockwise and counterclockwise but through less than one complete revolution.

Q: What is the most efficient rotary hydraulic motor?

A: Your hydraulic machine's overall efficiency will also be impacted by the hydraulic actuators you select. When it comes to the optimum rotary hydraulic motor, you should consider a radial piston motor or axial piston motor, which have about 95%and 90% efficiency, respectively.

Q: Can a rotary hydraulic motor be used as a hydraulic pump?

A: But their working principles are the same, they all rely on the change of the sealed working volume to work. In principle, it should be reversible, that is, any hydraulic pump can be used as a hydraulic motor, and any hydraulic motor can be used as a hydraulic pump.

Q: What is the rpm of a rotary hydraulic motor?

A: The speed of a rotary hydraulic motor is determined by the size of the plunger and the pressure applied to it. The smaller the plunger, the higher the pressure needed to move it and the faster the motor will operate. Typically, rotary hydraulic motor operate at a speed of around 1500 rpm.

Q: Why would you use a rotary hydraulic motor instead of an electric one?

A: Rotary hydraulic motor are ideal where it's impractical to provide enough current and voltage for an electric motor to make the torque and power required. Mobile machinery is an important application area, but these motors also drive heavy-duty industrial equipment like long conveyors, mixers and molding machines.

Q: What is the operating pressure of a rotary hydraulic motor?

A: It's measured in pounds per square inch (psi), and it's what allows us to operate hydraulic systems, such as pumps and valves. Normal hydraulic pressure is about 30 psi. Some systems may have higher or lower pressures, depending on the type of hydraulic system and the application.

Q: Is a rotary hydraulic motor a rotary actuator?

A: Some examples of rotary actuators include dc electric gear motors with gear reducers, pneumatic cylinders, and hydraulic motors. The most common type of rotary actuator is the electric motor-driven actuator, which uses an electric motor to rotate a shaft that is connected to a mechanical linkage.

Q: Why do rotary hydraulic motor fail?

A: Air and water contamination are the leading causes of hydraulic failure, accounting for 80 to 90% of hydraulic failures. Faulty pumps, system breaches or temperature issues often cause both types of contamination.

Q: Can you run rotary hydraulic motor in parallel?

A: Parallel connections of rotary hydraulic motor are used when you need a high torque in the application. Included the oil flow of the hydraulic pump distributed to the hydraulic motors connected in parallel. In this example, the oil flow (eg 60 l/min) is divided between 3 motors. So each motor gets 20 l/min.

Q: How do I choose a rotary hydraulic motor?

A: In summary: Remember that proper rotary hydraulic motor selection starts with the expected performance required by the application, then works back to the prime mover – the pump. It is then necessary to evaluate the cost of your motor options with the degree of complexity you want for your overall system.

Q: Are rotary hydraulic motor better than electric motors?

A: While rotary hydraulic motor can complete practically the same tasks as an electric motor, rotary hydraulic motor are better suited for heavy machinery applications. They are often more efficient when it comes to tough jobs with heavy loads.

Q: How can you tell if a rotary hydraulic motor is hydraulic pump?

A: If driven by an electric motor, the output is pressure energy (pressure and flow), then it is a hydraulic pump; if pressure oil is input, the output is mechanical energy (torque and speed) , it becomes a hydraulic motor. Structurally, the two are similar.

Q: How do you control the speed of a rotary hydraulic motor?

A: There are two main methods of rotary hydraulic motor torque control: Bypass control and differential control. Bypass control involves using a relief valve to divert excess fluid from the motor to a tank, while differential control involves using a directional valve to split the flow between the motor and a tank.

Q: How to make a rotary hydraulic motor spin faster?

A: One way is to increase the size of the pump impeller. This will increase the amount of water moving through the motor and create more torque. Another way to increase torque is to use a higher pressure water supply. This will cause the pump impeller to spin faster and create more torque.

Q: How to test a rotary hydraulic motor?

A: One of the simplest and most useful tools for testing hydraulic pumps and motors is a pressure gauge. A pressure gauge measures the force exerted by the fluid in the hydraulic system, and can help you determine the operating condition, efficiency, and leakage of the pump or motor.

Q: What is the rpm range of rotary hydraulic motor?

A: The speed of a rotary hydraulic motor can vary depending on the type of motor, the application, and the size and design of the rotor. However, in general, gear-driven hydraulic motors can spin between 1000 and 3000 rpm while direct-drive hydraulic motors can spin between 2000 and 6000 rpm.

Q: What is the torque of a rotary hydraulic motor?

A: To calculate a rotary hydraulic motor torque, multiply the pressure by the displacement, then divide by 2 times pi.

Q: What is the maximum speed of a rotary hydraulic motor?

A: The rotary hydraulic motor range from high-speed motors of up to 10,000 rpm to low-speed hydraulic motors with a minimum of 0.5 rpm. Low-speed hydraulic motors can generate large torques at low speeds.

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