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What are the functions and structural performance characteristics of double row tapered roller bearings?

Tapered roller bearings are separable bearings, and both the inner and outer rings of the bearing have tapered raceways. There are many kinds of its classification, such as: single-row tapered roller bearings, double-row tapered roller bearings, four-row tapered roller bearings. Today, this editor would like to introduce to you the function of the four-row tapered roller bearing and what are its structural performance characteristics?

Double row tapered roller shaft explanation:

The outer ring (or inner ring) of a double row tapered roller bearing is a single piece. The small end faces of the two inner rings (or outer rings) are similar, and there is a spacer in the middle. The clearance is adjusted by the thickness of the spacer. The thickness of the spacer can also be used to adjust the pre-interference of the double-row tapered roller bearing.

Structure and performance characteristics of double row tapered roller bearings:

Double row tapered roller bearings have many structures, the largest is the 35000 type, which has a double raceway outer ring and two inner rings, and there is a spacer between the two inner rings, and the thickness of the spacer can be adjusted to adjust the clearance. This type of bearing can bear two-way axial load while bearing radial load, and can limit the axial displacement of the shaft and the housing within the range of the bearing’s axial clearance.

Introduction of Double Row Tapered Roller Bearing – Main Structure of Tapered Roller Bearing:

Double row tapered roller bearings are mainly used to bear the combined radial and axial loads mainly based on radial loads. It can limit the axial displacement of the shaft (or housing) in both directions, so it can be used as a bidirectional axial positioning.

Double row tapered roller bearings can bear bidirectional axial loads while bearing radial loads. The clearance has been adjusted before the product leaves the factory, so it can be installed and used directly without adjusting the clearance. Double row tapered roller bearings can limit the axial displacement of the bearing relative to the bearing seat in two directions within the axial clearance range of the bearing.

The predecessor of the double-row tapered roller bearing is the bearing pairing form of a single tapered roller bearing, which has developed into a finished double-row component in recent years. Generally, double-row tapered roller bearings are made of four parts, and the spacers are generally left with sufficient machining allowance when they leave the factory. They are used to adjust the bearing clearance or preload, and must be repaired by the bearing assembly mechanism. Ground, so most double row tapered roller bearing inner and outer rings can be separated.

Double row tapered roller bearings can withstand heavier compound (radial and axial) loads and have strong rigidity. Can be axially fixed in both directions, with a certain axial play or a certain preload. Double row tapered roller bearings are mainly used in gearboxes, lifting equipment, rolling mills and in mining machinery such as tunnel boring machines.

35000 type structure bearing (TDO type) 35000 type structure bearing has a double raceway tapered outer ring and two inner rings with roller and cage assemblies. Usually these bearings have a spacer between the two conical inner rings. Since the axial play or preload has been adjusted during the production phase, they are quick-fit components. These bearings are arranged back-to-back, so the load lines are separated towards the bearing lines. Due to this, the bearing can be used in a more rigid configuration, allowing considerable tilting moments. Type 35000 double row tapered roller bearings have a variety of internal structures:

Bearings with spacer ring and sheet steel stamped window cage.

Bearings with spacer rings, hollow rollers and strut-type steel cages.

Bearings with matching extended inner rings close to each other and with stamped sheet steel window cages. Type 37000 structure imported bearing (TDI type) This structure has a double raceway tapered inner ring and two tapered outer rings with two sets of roller and cage assemblies. The double row rollers are arranged face to face. A spacer ring is usually arranged between the two outer rings. Selecting the size of the spacer will get a certain axial clearance or preload. Type 37000 structure double row tapered roller bearings have a variety of internal structures: — Bearings with intermediate spacers and steel stamped window cages. — Bearings with spacer rings, hollow rollers and steel strut cages. Large taper angle bearing for axial thrust of rolling mills.

Main features of tapered roller bearings

Tapered roller bearings are separable bearings, the inner and outer rings of the bearing have tapered raceways, and the rollers are truncated.

The roller and the raceway are in line contact, which can bear heavier radial and axial combined load, and can also bear pure axial load. The larger the contact angle, the higher the axial load carrying capacity.

The design of the tapered roller should make the contact line between the roller and the inner and outer raceways extended and intersect at the same point on the bearing axis to achieve pure rolling.

The newly designed tapered roller bearing adopts a reinforced structure, the roller diameter is increased, the roller length is increased, the number of rollers is increased, and the rollers with convexity are used, so that the bearing capacity and fatigue life of the bearing are significantly improved. The contact between the large end face of the roller and the large rib adopts the spherical surface and the conical surface to improve the lubrication.

This type of bearing can be divided into different structural types such as single-row, double-row and four-row tapered roller bearings according to the number of rows of rollers installed. This type of bearing also uses inch series products.

Cage type:

Steel stamping cages are mostly used, but when the outer diameter of the bearing is greater than 650mm, a pillar welded structure cage with rollers and pillar holes is used.

The main purpose of tapered roller bearings

Single row: front and rear wheels of automobiles, main shafts of machine tools, axle vehicles, rolling mills, construction machinery, hoisting machinery, printing machinery and various deceleration devices.

Double row: machine tool spindle, rolling stock

Four rows: roll support

Main structure of tapered roller bearing

Single row tapered roller bearings:

This kind of bearing can bear radial load and axial load in one direction from the back. The bearing cannot be used in a single set. Under the action of radial load, additional axial force will be generated. It is often necessary to add a bearing that can withstand axial force in the opposite direction to balance, that is, two sets of bearings are used in pairs. Preload can also be achieved during high-speed clearance during installation and use. The ability of a single row tapered roller bearing to withstand axial loads depends on the contact angle. The larger the contact angle, the greater the axial load capacity. This kind of bearing limits the axial displacement of one side of the shaft or the housing, and does not allow the shaft to be inclined relative to the housing hole.

Large taper angle tapered roller bearings:

The inclination angle of the outer ring raceway generatrix of this kind of bearing to the axis line is α=25°-29°. The bearing capacity of bearing axial load is higher than that of ordinary tapered roller bearings, and it is mainly used to bear combined radial and axial loads mainly in one direction, but it is not suitable to bear pure radial load.

Single row tapered roller bearings with retaining ribs on the outer ring:

The outer ring of this kind of bearing is provided with a retaining rib, which is convenient for axial positioning, and the shell hole can be machined or a through hole, which simplifies the axial fastening device.

Double inner ring double row tapered roller bearing with inner spacer:

This kind of bearing has double-row rollers, so it has a high ability to bear radial loads, and can bear radial and axial combined loads mainly based on radial loads. There is a spacer between the two inner rings of the bearing, and the clearance of the bearing can be adjusted by changing the thickness of the spacer. This kind of bearing can limit the axial displacement of the shaft or housing in both directions within the axial clearance limit of the bearing.

Double outer ring double row tapered roller bearings:

This kind of bearing has two outer rings, which can be installed separately, and the axial clearance can be adjusted by using the spacer ring. It can bear large radial and axial combined loads mainly based on radial loads. The axial displacement of the bearing or housing in both directions can be limited within the axial clearance range of the bearing.

Double row tapered roller bearings

Double inner ring double row tapered roller bearings:

This kind of bearing has two rows of rolling, so it can bear a large combined radial and axial load mainly based on radial load. By grinding the small end faces of the two inner rings to change the width of the inner ring, the bearing is adjusted. Clearance, this kind of bearing can limit the axial displacement of the shaft or housing in both directions within the axial clearance limit of the bearing.

Four row tapered roller bearings:

This kind of bearing has four rows of runners, which can bear large radial loads and axial loads in two directions. The displacement of the shaft or housing in two axial directions can be limited within the axial clearance range of the bearing. By changing the width of the spacer, the axial clearance of the bearing can be adjusted.

Inch tapered roller bearings:

Inch tapered roller bearings refer to tapered roller bearings whose external dimensions are measured in inches. There are also single-row, double-row, four-row and other types of structures. The working performance is the same as the corresponding metric tapered bearings.

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