Hydraulic motors are typically smaller than plunger motors, but they generally operate at lower speeds—usually under 200 revolutions per minute. They also tend to have weaker resistance to contamination. Despite this, vane motors offer several advantages, such as a compact design, reduced noise levels, and longer service life, due to their efficient construction and minimal internal leakage.
These motors are widely used in various industries, including hoists, ships, construction equipment, mining machinery, injection molding systems, metallurgical devices, shipbuilding, petrochemicals, and port handling equipment. As energy conversion devices, hydraulic motors transform hydraulic energy into mechanical motion, making them essential in many industrial applications.
For small cranes, the BM4 series cycloidal hydraulic motor is specifically designed to meet demanding operational requirements. It features a convenient forward and reverse switching mechanism, ensuring stable speed performance. The motor offers multiple oil port configurations, output shaft options, and flange designs for flexible integration.
The column-mounted stator and rotor system improves oil distribution accuracy and mechanical efficiency. It also includes a reliable shaft seal with high back pressure tolerance, allowing it to be used in both series and parallel setups. Key operational guidelines include:
1. In intermittent use, the motor should not run for more than 10% of the time per minute.
2. It's recommended to use 68# anti-wear hydraulic oil with a viscosity range of 37–73 cSt and ISO cleanliness class 18/13.
3. The motor should not operate at maximum pressure and maximum speed simultaneously.
4. Maximum working pressure refers to the inlet pressure, while rated pressure is the pressure differential.
5. The motor can handle up to 10 MPa of back pressure, but it's advisable to keep it below 5 MPa. If exceeding, an external drain line should be connected.
6. The maximum operating oil temperature is 80°C.
7. Before full load operation, the motor should be run at 40% of the maximum pressure for one hour.
This motor is ideal for small cranes of various capacities, such as 5-ton, 8-ton, and 12-ton models. The BM4 cycloidal hydraulic motor excels in several areas:
1. It can be used in series or parallel within the hydraulic system, and when used in series, an external drain line must be installed.
2. Advanced stator and rotor design ensures low starting pressure, high efficiency, and smooth low-speed operation.
3. A tapered roller bearing design provides strong radial load capacity, enabling direct drive of the working mechanism.
4. An advanced shaft seal allows for high back pressure tolerance.
5. A robust linkage shaft design enhances the motor’s durability and lifespan.
6. The flow distribution mechanism is highly accurate and features automatic wear compensation, ensuring long-term reliability and performance.
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