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The advantages of rolling bearings and plain bearings

Luoyang LBR bearing Co.,Ltd | Updated: Jan 22, 2018

The advantages of rolling bearings and plain bearings

Sliding bearings, bearings that work under sliding friction. Smooth sliding bearing work, reliable, non-slip bearings In the liquid lubrication conditions, the sliding surface is separated by the lubricant without direct contact, but also can greatly reduce the friction loss and surface wear, the oil film also has a vibration-absorbing ability. However, starting friction resistance larger. The part of the shaft supported by the bearing is called the journal, and the part matching the journal is called the bearing bush. The layer of anti-friction material cast on its inner surface for the purpose of improving the frictional properties of the pad surface is called the bearing lining. The bearings and bearing linings are collectively referred to as plain bearing materials. Commonly used sliding bearing materials bearing alloy (also known as Babbitt or white metal), wear-resistant cast iron, copper and aluminum alloys, powder metallurgy materials, plastics, rubber, hardwood and carbon - graphite, PTFE ), Modified polyoxymethylene (POM), and the like. Plain bearing applications are generally under low-speed heavy-duty conditions, or maintenance and filling lubricants difficult operating parts.

A precision mechanical element that changes the sliding friction between a rotating shaft and a shaft seat into rolling friction, thereby reducing friction losses, is called rollingbearing. Rolling bearings generally by the outer ring, inner ring, rolling body and cage composition. The role of the inner ring is to cooperate with the shaft and rotate together with the shaft, the role of the outer ring is matched with the bearing, play a supporting role, the rolling body is by means of a cage evenly distributed rolling body between the inner and outer rings , Its shape size and quantity directly affect the serviceability and service life of the rolling bearing. The cage can make the rolling elements evenly distributed, preventing the rolling elements from falling off and guiding the rolling elements to rotate to lubricate.

Rolling bearings

Rolling bearing easy to use and maintain, reliable, starting performance, high load capacity at medium speed. Rolling bearings and plain bearings Rolling bearings larger radial size, poor damping capacity, high speed, low life, larger sound. Radial bearings in rolling bearings (mainly radial forces) are usually composed of 4 parts of inner ring, outer ring, rolling element and rolling element cage. The inner ring is tightly sleeved on the journal and rotates together with the shaft. The outer ring is mounted on the bearing seat hole. Raceways are made on the inner periphery of the inner ring and the inner ring of the outer ring. When the inner and outer rings rotate relative to each other, the rolling elements roll on the raceways of the inner and outer rings. They are separated by the cage to avoid mutual friction. Thrust bearing sub-tight ring and living ring in two parts. Tight circle and sleeve tight, live ring bearing in the bearing. Rings and rolling elements are usually made of high strength, good wear resistance of the rolling bearing steel, the surface hardness after quenching should reach HRC60 ~ 65. Cage made of mild steel stamping, copper alloy cloth can also be used to make bakelite or plastic.

Compared with plain bearings and rolling bearings

Advantages of plain bearings:

1, the friction coefficient, power consumption and more.

2, not suitable for mass production, poor interchangeability, inconvenient to install, disassemble and repair.

3, the internal gap, processing accuracy is not high.

4, low transmission efficiency, heat, lubrication maintenance inconvenient, consuming lubricant.

5, load, speed and temperature to adapt to a narrow range, a small amount of changes in conditions, a greater impact on the performance of the bearing.

6, can not bear both radial and axial load.

Advantages of plain bearings:

1, with the same volume of rolling bearing load capacity to be much larger.

2, small vibration and noise, used in high precision, but also does not allow the occasion of vibration.

3, the impact of metal foreign objects smaller, not easy to produce early damage.

  • Add: No.5, Orient Classic, XueZi Street, LuoLong Zone, Luoyang City.

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