Sliding bearings: Sliding bearings (slidingbearing), in the sliding friction work under the bearing. Sliding
bearings work smoothly, reliable, noise-free bearings Under liquid
lubrication conditions, the sliding surface is separated by lubricating
oil without direct contact, but also can greatly reduce the friction
loss and surface wear, oil film also has a certain vibration absorption
capacity. But the starting friction is greater. The shaft is supported by the bearing part called the journal, and the part that matches the journal is called the bearing. The
friction-reducing material layer cast on its inner surface in order to
improve the frictional properties of the pad surface is called a bearing
lining. The material of the bearing pad and the bearing lining is collectively referred to as a sliding bearing material. Commonly
used sliding bearing materials are bearing alloy (also known as Babbit
or white alloy), wear-resistant cast iron, copper and aluminum alloy,
powder metallurgy materials, plastic, rubber, hardwood and
carbon-graphite, polytetrafluoroethylene ), Modified polyoxymethylene (POM), and the like. Sliding bearings are generally used in low-speed, heavy-duty conditions, or where they are difficult to maintain and refill.
Will
be running between the shaft and the sliding between the sliding
friction into a rolling friction, thereby reducing the friction loss of a
sophisticated mechanical components, called rolling bearings
(rollingbearing). Rolling bearings generally by the outer ring, inner ring, rolling body and cage composition. Wherein
the inner ring functions in cooperation with the shaft and rotates with
the shaft, the outer ring action cooperates with the bearing seat, and
the rolling element is distributed between the inner ring and the outer
ring evenly by means of the cage , Its shape size and quantity directly affect the use of
rolling bearings performance and life, cage can make the rolling element
evenly distributed to prevent the rolling off, to guide the rolling
body from the role of lubrication.
Rolling bearings: Rolling bearings easy to use, reliable, good starting performance, high load capacity in the medium speed. And
radial bearings Rolling bearings Rolling bearings radial size larger,
poor damping capacity, high speed, low life, sound larger. Radial
bearings in the radial bearing (mainly bear radial force) is usually by
the inner ring, outer ring, rolling body and rolling cage 4 parts. The inner ring is tightened on the journal and rotates with the shaft, and the outer ring is mounted in the bearing hole. A raceway is made on the outer circumference of the inner ring and the inner circumference of the outer ring. When
the inner and outer rings relative rotation, the rolling body that is
rolling on the inner and outer ring raceway, they are separated by the
cage to avoid friction with each other. Thrust bearings are divided into two parts. Tight ring and shaft sleeve tight, live ring support in the bearing seat. Ferrule
and rolling body is usually made of high strength, good wear resistance
of the rolling bearing steel manufacturing, quenching surface hardness
should reach HRC60 ~ 65. Cage made of soft steel stamping can also be made of copper alloy cloth bakelite or plastic manufacturing.
Sliding bearings and rolling bearings compared to the advantages of sliding bearings:
1, the friction coefficient, power consumption and more.
2, not suitable for mass production, interchangeability is not good, not easy to install, disassembly and maintenance.
3, the internal gap is large, the processing accuracy is not high.
4, transmission efficiency is low, heat, lubrication maintenance is not convenient, cost lubricant.
5, load, speed and operating temperature to adapt to a narrow range of
working conditions, a small amount of changes in the performance of the
bearing a greater impact.
6, can not bear radial and axial load at the same time.
Advantages of sliding bearings:
1, with the same volume of rolling bearing capacity to load much larger.
2, vibration and noise, used in high precision requirements, and does not allow the vibration of the occasion.
3, the impact on the metal foreign body is small, easy to cause early damage.
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