A hydraulic bearing is a modification of an oil bearing. The following is a detailed introduction to hydraulic bearings:

I. Definition and characteristics of hydraulic bearing

Hydraulic bearing is still essentially a kind of oil bearing, but it has a larger oil storage space than the oil bearing and a unique loop back type oil supply circuit. This design makes the life of hydraulic bearings greatly extended than ordinary oil-sealed bearings, and inherits the advantages of oil bearing running noise is small.

Second, the working principle of hydraulic bearing

Hydraulic bearing is a kind of bearing based on liquid hydrostatic principle. It uses the pressure of the liquid to support the bearing work, reduce the contact pressure between the bearing and the shaft to achieve the separation between the shaft and the bearing. The hydraulic bearing consists of two parts, the outer sleeve and the inner sleeve, which form a certain gap between them, and the liquid fills in the gap. When the static pressure of the liquid increases, the liquid will form a pressure area in the bearing gap, thus supporting the bearing and reducing the contact pressure.

Third, hydraulic bearing application areas

Hydraulic bearings are widely used in industrial fields, especially in high-speed, heavy-duty and high-precision equipment. For example, in the field of aviation, hydraulic bearings are used in aircraft wheel hubs, brackets and other components; in the field of shipping, it is applied to rotating equipment on the deck, rotating hangers and other components; in the field of heavy machinery, hydraulic bearings are used in railway bridging machinery, cranes, tower cranes, cement plant turntable and other equipment.

Fourth, hydraulic bearing advantages and disadvantages

The advantages of hydraulic bearings are its smooth operation, low noise, long life and other characteristics. However, the manufacturing cost of hydraulic bearings is relatively high, and the purity of the liquid and sealing requirements are high. If the fluid contains impurities or is poorly sealed, it may lead to bearing damage or performance degradation.

1. Airtight oil retention design: hydraulic bearings change the non-sealed state of the traditional design by completely sealing the bottom of the fan to form an airtight environment, which effectively prevents the volatilisation of lubricating oil and the intrusion of dust, thus enhancing the reliability of the bearings.

2. Large space for oil storage: It has a larger oil storage space, which can store more lubricating grease and ensure that the bearings are always in a good lubrication state during operation, thus prolonging their service life.

3. special grease: it uses special low-wear and high-temperature-resistant grease, which has a low wear rate and maintains good lubrication even when working continuously for a long time at high temperatures and avoids volatilisation of the grease.

4. Pressure-permeable oil circuit design: This design allows the intercommunication between the bearings and the oil reservoir to ensure that the lubricating grease can be supplied to the bearings at the right time to maintain an efficient lubrication cycle.

5. Powder Metallurgy Bearings: Bearings made with powder metallurgy technology have tiny cavities inside, which are pre-filled with lubricating grease, and the grease overflows out to lubricate during operation, and together with the pressure-permeable design, continuous lubrication is realised.

6. Specialised shaft: The shaft is made of special materials, such as those used in aerospace grade, to enhance wear resistance and ensure a longer service life.

The main improvements of hydraulic bearings over traditional bearings include:

1. sealing design: the hydraulic bearing improves the non-sealing design at the bottom of the traditional bearing and adopts a fully sealed structure, which effectively prevents the volatilisation of lubricating grease and the entry of external dust, improves the cleanliness inside the bearing and extends its service life.

2. Lubricant storage space: it has a larger lubricant storage space, through the unique design, it can store more lubricant to ensure that the bearing maintains a good lubrication state in long time operation, thus improving stability and durability.

3. Lubrication system: hydraulic bearings are usually designed with a loop-back lubrication circuit, which makes the lubricating grease circulate more efficiently and keeps the bearings fully lubricated even at high speeds, reducing wear.

4. Special lubricants: low wear, high temperature resistant grease is used, this grease can remain stable under extreme conditions, reducing grease failure due to high temperatures or prolonged operation, ensuring continuous lubrication of the bearings.

5. Reduced noise: Due to its optimised lubrication and sealing design, the noise generated by the hydraulic bearings during operation is significantly lower than that of traditional oily bearings, which improves the overall quiet performance of the equipment.

6. Improved performance and life: by reducing friction and wear, hydraulic bearings can effectively improve equipment operating efficiency and extend bearing life, sometimes up to tens of thousands of hours.

7. Enhanced Adaptability: The ability to adapt to higher operating temperatures and harsher operating environments, maintaining a consistent performance output.

These improvements make hydraulic bearings the preferred choice in application scenarios that require low noise, high stability and long life.

Hydraulic bearings compared to plain bearings:

Hydraulic bearings and plain bearings each have their own features and advantages, and which one is better to use depends on the application and requirements. The following is a detailed comparison of the two:

First, the performance characteristics

Hydraulic bearings

1. Stability: hydraulic bearings in high speed, high temperature, high load and other harsh environments can still maintain stability, and can eliminate mechanical noise and vibration.

2. Noise: hydraulic bearings run with less noise, suitable for occasions with higher noise requirements.

3. Life: hydraulic bearings have a relatively long life, up to 40,000 hours or more, suitable for equipment that requires long periods of continuous work.

4. Carrying capacity: hydraulic bearing adopts hydraulic principle, can resist larger torque, strong carrying capacity.

Ordinary bearing

1. Simple structure: the structure of common bearings is relatively simple, easy to install and maintain.

2. Widely applicable: ordinary bearings are applicable to various speeds and load conditions, and are indispensable components in mechanical transmission.

3. Low cost: the manufacturing cost of common bearings is relatively low, applicable to general mechanical equipment.

Second, the field of application

Hydraulic bearing

Hydraulic bearings are widely used in occasions that require high precision, high stability and long life, such as aviation, shipping, heavy machinery and other fields.

In cooling fans, hydraulic bearings are also widely used because of their low noise and long life.

Ordinary bearings

Ordinary bearings are suitable for all kinds of mechanical equipment, such as automobiles, machine tools, motors and so on.

In some of the noise and life requirements are not high occasions, ordinary bearings can also meet the demand.

Advantages and disadvantages comparison

Hydraulic bearing

Advantages: good stability, low noise, long life, strong bearing capacity.

Disadvantages: high manufacturing cost, technical difficulties, maintenance complexity.

Ordinary bearings

Advantages: simple structure, low cost, widely used.

Disadvantages: in harsh environments may not be stable enough, noise, life is relatively short.

Suggestions for selection

1. Selection according to the application occasions: in need of high precision, high stability and long life occasions, give priority to the choice of hydraulic bearings; in general mechanical equipment, you can choose ordinary bearings.

2. Consider the cost and maintenance: the manufacturing cost and maintenance cost of hydraulic bearings is higher, need to consider the overall cost of equipment and budget; ordinary bearings are relatively economical and practical.

In summary, hydraulic bearings and ordinary bearings have their own advantages and shortcomings. In the choice, need to be based on specific applications, equipment requirements, cost budget and other factors for comprehensive consideration.

V. Maintenance

In order to ensure the normal operation of the hydraulic bearings and extend their service life, it is necessary to carry out regular maintenance and repair. This includes checking the lubrication of the bearing, cleaning the bearing surface of dirt and impurities, as well as regular replacement of lubricants and so on. In addition, attention should also be paid to avoid excessive loads and shocks on the bearings, as well as to keep the operating temperature of the bearings within the normal range.

To sum up, hydraulic bearing is a kind of bearing type with superior performance and wide application. By understanding its working principle, application areas and maintenance methods, you can make better use of the advantages of hydraulic bearings to ensure the normal operation of the equipment and extend the service life.