4 long cylindrical roller bearing

The cross roller bearings  and a long cylindrical roller bearings are cylinder, the length Lw and diameter Dw ratio (Lw/Dw) greater than 3, the difference is the long cylindrical roller bearing roller diameter greater than 5 mm, and the needle taper roller bearing diameter less than 5 mm.

The basic structure of needle bearing is composed of a pair of rings, a group of needle, the outer ring belt guide rib and the oil hole.

Needle roller bearings because of its compact structure, small radial dimension, large load capacity, suitable for the radial profile of the limited size of components. The bearings can only bear radial load, can not bear the axial load. Its low speed limit.

The basic structure of cylindrical roller bearing consists of a ring, a retainer, a group ofcylindrical roller, is applicable to radial limited size, low speed components, can bear radial load. The installation does not allow the outer axis and the inner axis tilt.

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Basics - bearing classification / composed / selection / installation

Classification, bearing

Sliding bearing: contact (numerous points of contact); suitable for very high speed, very low (load); shaft is suspended, the oil is very important.

Rolling bearings: metric bearing: point contact: light load speed;

Classification, bearing

Sliding bearing: contact (numerous points of contact); suitable for very high speed, very low (load); shaft is suspended, the oil is very important.

Rolling bearings: ball bearing: point contact: light load speed;

Roller bearings: linear contact: heavy-duty high-speed;

Two, bearing

The outer ring, inner ring, rolling body cage,: bearing retainer

Cage effect:

1, to prevent direct contact between the rolling body to reduce friction and heat generation;

2, the rolling body guide;

3, to provide lubrication space;

In 4, install or Uninstall can avoid a rolling body powder.

Three, the role of bearing

1, to support the shaft and parts on the shaft, to keep the rotating precision of shaft;

2, to reduce friction during rotation and wear;

Four, bearing selection principle

1, ball and roller combined bearing than the limit speed of roller bearing high, priority should be given to the selection of ball bearing;

2, at high speed to the selection of bearing, ultra light, super light and light series (inner diameter and outer diameter, the smaller, the rolling body is light and small, 

centrifugal inertial force is small);

3, cage materials has a great influence on bearing speed, solid cage than stamping cage to allow higher speed;

The speed limit is 4, thrust bearing is very low, when working at high speed, if the axial load is not very big, can use the angular contact ball bearings to bear pure axial 

force;

5, if the speed exceeds the bearing sample, can be used to improve the tolerance level, increasing the clearance, the circulating cooling method.

Rolling installation and disassembling bearing

Assembling and disassembling bearing, to pay special attention to the following two points:

1, do not allow the rolling body force, so as not to make the raceway and rolling body damage.‍

bearing temperature

The thin section bearing temperature are the main reason:

The first: whether the lubricating oil quality deterioration? If the viscosity of lubricating oil can also result in INA bearing temperature rise

Second: linear ball bearingassembly if too tight, the gap will lead to inadequate flange bearing temperature rise;

Third: bearing assembly too tight will result in bearing temperature rise;

Fourth: Race rotation on the shaft or shell will result in bearing temperature rise;

Fifth: the radial bearing load is too large will result in bearing temperature rise;

Sixth: if the bearing cage or a rolling body broken words, will result in bearing temperature rise‍

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