Bearingless Hydraulic Motor

 

Hydraulic motors are widely used in numerous fields, including heavy equipment and manufacturing machinery. Traditional hydraulic motors rely on bearings to support the rotating shaft; however, bearings wear out over time, leading to maintenance issues and ultimately degrading motor performance.

 

The bearingless hydraulic motor represents a revolutionary technology that eliminates the need for bearings to support the rotating shaft. Instead, it utilizes a high-pressure fluid film as a lubricant to suspend the shaft. This design ensures there is no contact between the rotating shaft and the motor housing during operation, thereby reducing wear and virtually eliminating the need for maintenance.

 

One of the most significant advantages of bearingless hydraulic motors is their extended service life compared to traditional models. The absence of direct metal-to-metal contact results in smoother, quieter operation and reduced friction, leading to higher mechanical efficiency and greater durability. Additionally, bearingless motors are typically more compact and lightweight, making them ideal for space-constrained applications.

 

Another major advantage is superior efficiency. Traditional hydraulic motors lose significant energy due to friction and wear during operation; in contrast, bearingless motors operate with minimal to zero energy loss, offering substantial cost savings in the long run.

 

Finally, bearingless hydraulic motors offer a more environmentally friendly alternative to traditional motors. With lower energy consumption and reduced waste heat generation, they help lower carbon emissions and promote environmental sustainability.

 

In summary, as a modern alternative to traditional hydraulic motors, it offers multiple advantages, including a longer service life, higher efficiency, and more environmentally friendly operation. It is therefore not surprising that an increasing number of industries are adopting this technology in their production operations.

 

 

 

◎ Advanced stator and rotor parameters design, with low starting pressure, high efficiency and stable low speed operation;

◎ High operating pressure and high output torque;

◎ Advanced shaft seal design, with high back pressure bearing capacity;

◎ Advanced and reliable linkage shaft design, with a long motor service life;

◎ Advanced oil distribution mechanism design, with high oil distribution accuracy and automatic wear compensation;

◎ The motors can be used in series and parallel; when they are connected in series, they should be connected to the external drain pipe;

◎ Tapered roller bearing support design, with a large radial load carrying capacity, so that the motor can be used directly drive the operating mechanism.

 

 

Displacement, cc/r		63	80	100	125	160	200	250	305	400
Flow, LPM	Cont.	75	75	75	75	75	75	75	75	75
	Int.	95	95	95	95	115	115	115	115	115
Speed, RPM	Cont.	960	851	739	575	477	385	308	246	191
	Int.	1150	908	924	719	713	577	462	365	335
Pressure, MPa	Cont.	17	20	20	20	20	20	20	20	17
	Int.	21	24	24	24	24	24	24	24	21
Torque, Nm	Cont.	145	217	271	338	433	541	677	826	888
	Int.	179	260	325	406	520	650	812	885	925
Max. allowable back pressure		14MPa

 

◎ The intermittent operating pressure refers to the Max. allowable operating pressure at the motor inlet port, and the continuous operating pressure refers to the pressure difference between the inlet port and the return port.

◎ Do not operate the motor at the Max. speed and the Max. pressure at the same time.

◎ The motor operating time per minute must not exceed 10% under intermittent operating conditions.

◎ Recommended oil: anti-wear hydraulic oil; Viscosity: 37-73cst; Oil cleanliness: IS018/13; Max. operating oil temperature: 80 ℃.

 

◎ With special dynamic seal design, the Max. allowable back pressure of the motor can be up to 10MPa; however, in order to obtain the good service life and comprehensive mechanical performances, the back pressure should not exceed 5MPa. If it is exceeded, it is recommended to connect the external drain pipe; when connecting the external drain pipe, ensure that the motor is always filled with oil. The external drain pipe should be throttled at a certain degree, to maintain a back pressure of more than 3.5 Bar. When connecting the external drain pipe, in addition to maintaining a low back pressure, the wear contaminants generated inside the motor can be removed and a certain cooling effect can be achieved.

 

◎ There should be a running-in period before the motor is operated at full load. It is recommended to run for 1h at 30% of the Max. operating pressure.

 

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