Plain Journal Bearing

Plain Journal Bearing is a mechanical component charged with bearing a load and allowing a sliding or rotational motion between two parts of a machine.

Flange Sleeve Bearings
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Bronze Thrust Bearing

Plain Bearing – Journal Bearing Manufacturer

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A plain bearing in railroading is sometimes called a solid bearing, journal bearing, or friction bearing. Journal or plain bearings consist of a shaft or journal that rotates freely in a supporting metal sleeve or shell. There are no rolling elements in these bearings.

Plain Journal Bearing, in general, is the least expensive type of bearing. They are also compact and lightweight, and they have a high load-carrying capacity.

Plain Journal bearing, C91000 Phosphor Bronze Bushing
BUCHSE, Plain Journal Bearing

Turbocharger Journal Bearings

Turbocharger journal bearings are cylindrical components designed to support the rotating shaft within a turbocharger. They play a pivotal role in reducing friction and ensuring the smooth operation of the turbocharger.

The Role of Turbocharger Journal Bearings

  • The primary function of journal bearings is to enable the smooth rotation of the turbocharger shaft at high speeds. This rotation is essential for compressing air and delivering it to the engine, which in turn increases power output.
  • By minimizing friction between moving parts, journal bearings help improve the overall efficiency of the turbocharger.
  • Durable journal bearings are crucial for the longevity of a turbocharger.
Turbocharger journal bearings
Plain Journal Bearing

Construction of Plain Journal Bearings

Plain journal bearings, often referred to as sleeve bearings, bushings, sliding bearings, solid bearings, or friction bearings, are simple yet highly effective mechanical components. Unlike their rolling-element counterparts, such as ball bearings and roller bearings, plain journal bearings lack rolling elements. Instead, they rely on a layer of lubrication to create a low-friction interface between the bearing and the shaft it supports.

Plain journal bearings consist of two main components: the shaft and the bearing. The shaft is the rotating component, while the bearing, typically made of a low-friction material like bronze or babbitt, is housed in a stationary structure. The bearing is precisely machined to fit the shaft diameter and incorporates lubrication grooves and oil holes for effective lubrication.

When a plain journal bearing is in operation, a lubricant film is formed between the rotating shaft and the bearing. This film prevents direct metal-to-metal contact, reducing friction and wear. The lubricant film is maintained by the hydrodynamic action, where the relative motion between the shaft and the bearing creates a pressure gradient that draws lubricant into the contact zone.

Types of Plain Journal Bearings

There are several variations of plain journal bearings, each suitable for specific applications. Some common types include:

  • a. Solid Sleeve Bearings
    Solid sleeve bearings are the simplest form of plain journal bearings, consisting of a solid cylindrical sleeve that fits around the shaft. They are cost-effective and suitable for low to moderate loads and speeds.
  • b. Split Sleeve Bearings
    Split sleeve bearings are similar to solid sleeve bearings but have a longitudinal split. This split allows for easy installation and removal without the need to dismantle the entire machinery.
  • c. Tilting Pad Bearings
    Tilting pad bearings consist of multiple individual pads that are attached to a supporting structure. These bearings can accommodate misalignments and provide increased stability and load capacity.
Plain Journal Bearing

Where is the Plain Journal Bearing Used?

Journal Bearings are used wherever movement is required. These applications range from Home Office Solutions to Agriculture and Equipment Parts to oil-free bearings for engines. Thus, in our everyday lives, nothing would work properly without a plain bearing.


Cam Unit

Our standard cam units are used to punch, cut, and form sheets and plates. It Change vertical movement into horizontal or inclined movement by the use of inclined wedges and sliding blocks.

Journal Bearing Lubrication

All rotating machinery requires lubrication in order to function properly and reduce wear and tear. One component of rotating machinery that often requires lubrication is the journal bearing. Proper lubrication of plain journal bearings has many benefits. Lubrication extends the life of the bearing by reducing wear and also helps to protect the bearing from corrosion. use bronze journal bearing with graphite to achieve self-lubricating. By friction, the solid lubricant in the bore or groove is transferred or counter-transferred to the friction surface, forming a well-lubricated, firmly adhered, and uniformly covered solid transfer film, which ensures good lubrication of the friction substrate during long-term operation.

bearing bronze, Plain Journal bearing, c90500 tin bronze bushing
Plain Journal bearing

Materials In a Journal Bearing

Journal Bearing is an important part of contemporary machinery and equipment, and is a very common mechanical hardware accessory, with it for better operation, then what material for bearings?

  • Brass (H62 ,H65, H68 ,H70 ,H85 ,H90)
  • Tin Bronze QSn5-5-5, QSn6-6-6, CuSn10Pb1,CuSn8,CuSn4,CuSn12
  • Aluminum Bronze C60600C64200,C60800,C61300C61400,C61900,C62300,C62400,C63000,CUAL10Fe3C63020,C63200C65100.CuAL9Fe4Ni4CuAL9Mn2CuAL9Ni3Fe2CuAL10Ni5Fe4,etc.

Bearing alloys, bronze, aluminum-based alloys and zinc-based alloys are all known as metallic materials.

What Is The Role Of Journal Bearing?

In terms of its role, Journal Bearing is to support and support the shaft. Unlike roller and ball bearings, journal plain bearings do not have any rolling elements. As a result, they are only capable of supporting radial loads, which stem from the weight of the shaft.

Self-lubricating Journal Plain Bearings

Plain Bearings are an important part of mechanical fittings. Responsible for the transfer or counter-transfer of solid lubricant from the hole or groove to the friction surface at high speeds, a well-lubricated, firmly adhered and uniformly covered solid transfer film is formed on the friction surface, substantially reducing frictional wear.

graphite dry bushing, graphite bushings and bearings

Plain Journal Bearing: A Simple and Efficient Solution for Motion Control

Bearings play a crucial role in various machines and mechanisms, enabling smooth and controlled motion. Among the wide array of bearing types available, one of the simplest and most cost-effective options is the Plain Journal Bearing. As the name suggests, these bearings have no moving parts and are commonly in the form of a cylinder. They find application in a diverse range of industries due to their uncomplicated design and reliable performance.
Types of Plain Journal Bearings:
Plain bearings come in three primary designs – journal, linear, and thrust. Each design caters to specific types of motion and load requirements.

split journal bearings

Double Flange Split Bronze Bushing Bearing, split journal bearing

Split journal bearings are made up of two halves. These halves or “housings” help to hold large diameter parts together, such as crankshafts.

Linear Bearings:

integral journal bearings

In contrast to journal bearings, linear bearings are tailored for linear motion. They are utilized in applications that require sliding plates or linear guide systems. These bearings enable smooth and precise linear movement, making them indispensable in various industrial automation and manufacturing processes.

Thrust Bearings:

Centrifugal Casting thrust washer

Plain thrust bearings are designed to handle axial loads, similar to their roller bearing counterparts. However, instead of using cone-shaped rolling elements, thrust bearings employ pads arranged in a circular fashion around the cylinder. These pads create wedge-shaped regions of oil inside the bearing between the pads and a rotating disk. This innovative design supports applied thrust and eliminates metal-on-metal contact, reducing wear and enhancing performance.

Journal Bearing

Plain Journal bearing, C91000 Phosphor Bronze Bushing

A journal bearing is a mechanical component mounted in a housing, usually by means of an interference fit. This provides a support surface. The dimensions of the housing and shaft will determine the required bushing inner and outer diameter.

dry journal bearings

ptfe bushing

Dry journal bearings consist of a shaft that rotates inside a dry sleeve. The sleeve is usually polymer as well as molybdenum, graphite, nylon or PTFE (polytetrafluoroethylene). The bearings are only suitable for low loads and low surface speeds.

semi-lubricated journal bearings

Double Flange Split Bronze Bushing Bearing

In semi-lubricated journal bearings, the shaft rotates in a porous metal sleeve of sintered bronze or aluminium in which the lubricating fluid is trapped in its pores. These bearings are only suitable for light loads, low to medium speeds and temperatures of up to 100 °C (210 °F).

plain journal bearing with graphite, bearing bushing sleeve

Advantages of Plain Journal Bearings

Plain journal bearings offer several advantages in various applications:

  • They provide reliable and smooth operation in high-speed applications.
  • They have a simple design, making them cost-effective and easy to manufacture.
  • can handle heavy loads and are suitable for both radial and axial loads.
  • offer excellent shock and vibration-damping properties.
  • No Rolling Elements: Unlike ball or roller bearings, journal bearings do not have rolling elements like balls or rollers. Instead, they utilize a lubricating layer to enable sliding motion.

Disadvantages of Plain Journal Bearings

  • require a continuous supply of lubricant to maintain the necessary film thickness.
  • more prone to wear and require regular maintenance.

Applications of Plain Journal Bearings

Plain journal bearings find application in a wide range of industries, including:

  • Automotive: Engine crankshafts, connecting rods, and camshafts.
  • Industrial Machinery: Pumps, compressors, turbines, and gearboxes.
  • Power Generation: Steam and gas turbines, generators, and hydroelectric turbines.
  • Aerospace: Jet engines, helicopter transmissions, and landing gear systems.

Suitable for Challenging Environments: Journal bearings excel in environments with high temperatures, moisture, or airborne particles. Their robust design can withstand harsh conditions with ease.

Proper maintenance and lubrication are crucial for the performance and longevity of plain journal bearings. Regular inspection, oil analysis, and lubricant replenishment are essential to ensure optimal operation.

plain journal bearing supplier, flange PB2 Phosphor Bronze Bushing

Unlock The Power Of Smooth Operations With Our Superior Plain Journal Bearing!

Plain journal bearings offer a simple yet efficient solution for motion control in various industrial applications. Their uncomplicated design, cost-effectiveness, and ability to handle substantial loads make them a popular choice across industries. With advances in materials and lubrication technologies, plain journal bearings continue to evolve, catering to the diverse needs of modern engineering and manufacturing. Whether it’s supporting radial motion, facilitating linear movement, or handling axial loads, plain journal bearings play a vital role in keeping the wheels of industry turning smoothly.


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