TheSAI GM Series Radial Piston Hydraulic Motoris a high-performance hydraulic motor produced by SAI, an Italian company. Below is a detailed introduction to this series of hydraulic motors:
I. Working Principle
When hydraulic oil enters the pistons inside the cylinder, the pistons extend outward and press against the inner wall of the stator. The stator exerts a reaction force on the pistons, generating torque on the cylinder and causing it to rotate. The cylinder then outputs torque and rotational speed through a transmission shaft connected to its end face.
II. Product Features
1. High Mechanical and Volumetric Efficiency: The SAI GM Series hydraulic motors efficiently convert hydraulic energy into mechanical energy, minimizing energy losses.
2. Excellent Cavitation Resistance: These motors demonstrate good cavitation resistance, enabling stable operation under high-pressure and high-speed conditions and extending service life.
3. High Continuous Rated Power: By enhancing the load-bearing strength of the housing and internal dynamic components, the SAI GM Series achieves high continuous rated power, meeting the demands of prolonged, high-load operations.
4. Reduced Internal Specific Loads: Optimized internal structural design reduces specific internal loads, minimizing heat generation and associated effects, and improving system stability.
5. Stable Low-Speed Performance: Due to reduced friction losses and improved sealing performance, these motors operate smoothly at low speeds with a wide speed regulation range.
6. High Starting Torque: The motors deliver high starting torque with high mechanical efficiency during startup, enabling rapid response to system demands.
7. Reversible Rotation: The rotation direction of the SAI GM Series hydraulic motors can be reversed to suit different operating conditions.
8. Pump Operation Capability: Under specific conditions, these motors can also function as pumps, offering versatile functionality.
III. Application Fields
The SAI GM Series radial piston hydraulic motors are widely used in equipment across various industries, including construction machinery, coal mining, shipbuilding, and plastic machinery. Examples of applications include excavators, loaders, road rollers, cranes, and injection molding machines.
IV. Models and Parameters
The SAI GM Series includes multiple models, such as GM05-60, GM05-75, and GM05-90, each with different displacement, rated pressure, peak pressure, rated torque, and other parameters to meet diverse operating requirements. Taking the GM05-60 as an example, its main parameters are as follows:
• Displacement: 59 cc/rev
• Cylinder Bore: 25 mm
• Stroke: 24 mm
• Torque: 0.94 Nm/bar
• Continuous Pressure: 250 bar
• Peak Pressure: 450 bar
• Peak Power: 20 kW
• Continuous Speed: 700 rpm
• Maximum Speed: 1000 rpm
• Weight: Approximately 22 kg
V. Technical Advantages
1. Hydrostatic Balance Design: The piston bottom is designed for hydrostatic balance, reducing friction losses during transmission and improving mechanical efficiency.
2. Planar Port Plate: The use of a planar port plate ensures simplicity, reliability, good sealing, and minimal leakage, enhancing volumetric efficiency.
3. Plastic Piston Ring Seals: Plastic piston rings provide a leak-free seal between the pistons and the swash cylinder, further improving volumetric efficiency.
4. Rolling Bearings for Torque Transmission: Torque is transmitted between the pistons and the crankshaft through rolling bearings, reducing friction losses and improving transmission efficiency.
5. High-Load-Capacity Bearings: The motors employ high-load-capacity bearings, ensuring reliable operation, long service life, and low noise levels.
