RU2226627C2 - Roller bearing - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: device has rollers, which are made in two-step form. Diameter of greater roller step is run in only along rolling track of outer bearing racer. Diameters of lesser step are run in only along rolling tracks of inner racer with equal constant rotation speed. Assemblage condition should apply to the bearing, said condition being: d1m/Dwm1=D1m/Dwm2, where: d1m - rolling track diameter for inner racer; Dwm1 - lesser roller step diameter; D1m - rolling tracks diameter of outer racer; Dwm2 - greater roller step diameter. Rolling track of inner racer is made with through recesses for forming a gap with greater diameter of roller steps. Such construction allows rollers to roll along bearing roller tracks without slippage. EFFECT: assured proper rolling of rollers during their running in rolling tracks, increased limiting rotation frequency, lowered noise during operation. 2 dwg

Description

The invention relates to the field of mechanical engineering and instrumentation and can be used in all industries. The invention relates to the most important structural elements of machines and devices and makes up the bulk of the friction units.

Known rolling bearings containing inner and outer rings with raceways, the rolling bodies located between them, made in the form of rollers installed in the nests of the separator.

The main disadvantage of the known rolling bearings is the lack of pure rolling friction. During the operation of known bearings, rolling friction with slipping of rolling elements is present.

For example, take a single row radial roller bearing with short cylindrical rollers No. 2113 according to GOST 8328-75 (d65 × D100 × B18; dp = 9 mm, number of rollers Z = 20). A roller with dp = 9 mm is run along the raceway of the inner ring d1m 73.5 mm. For one revolution of the shaft, the roller must make N revolutions = π 73.5 / π 9 = 8.166; and along the raceway of the outer ring D1m = 91.5 mm, the roller makes N revolutions = π 91.5 / π 9 = 10.166.

That is, the roller makes two turns more - this is the amount of slippage of the roller relative to the raceway of the outer ring of the bearing (and there are Z = 20 in the bearing).

Known rolling bearing prototype according to patent FR 2699238 A C. F16C 19/22, containing inner and outer rings with raceways, rolling bodies located between them, made in the form of rollers installed in sockets of a separator, in which rolling bodies - rollers are made in two stages. A larger step diameter having one contact area only with the race track of the outer ring of the bearing, and a smaller step diameter made with two sections interacting only with the race track of its inner ring with a constant and the same speed, while the condition for assembling the bearing must be met

d1m / Dwm1 = D1m / Dwm2,

where d1m is the diameter of the raceway of the inner ring of the bearing;

Dwm1 is the diameter of the lower roller stage;

D1m is the diameter of the raceway of the outer ring of the bearing;

Dwm2 is the diameter of the larger stage of the roller, and the raceway of the inner ring of the bearing is made with one groove to form a gap with a large diameter of the stage of the roller.

The purpose of the invention:

- ensuring a clean rolling of the rolling bodies when rolling them along the raceways of both the inner and outer rings of the bearing;

- increasing the maximum speed of the rolling bearing, for example, up to 333 T ^-1 ;

- noise reduction during operation of the bearing.

The goals and technical effect of the alleged invention is achieved due to the fact that two additional grooves are made on the raceway of the inner ring of the bearing, and part of the rollers are made with two sections of a lower stage interacting with the raceways of the inner ring of the bearing and one section of a larger stage interacting with the track rolling of the outer ring, and part of the rollers is made with three sections of a lower stage interacting with the raceways of the inner ring of the bearing, and two sections of a larger stage interacting with the raceway of the outer ring.

Figure 1 shows the radial roller bearing without collars on the outer ring and three annular grooves on the raceway of the inner ring. Figure 2 shows a scan of section aa of figure 1.

The rolling bearing consists of an outer ring 1, rolling elements 2 and 4, an inner ring 3 (cage not shown). The rolling elements 2 are made in the form of a two-stage cylindrical roller, the larger diameter of the roller step Dwm2 is in contact along the raceway D1m of the outer ring 1 of the bearing.

A smaller diameter of the roller Dwm1 is made with two sections of a lower stage, which are in contact with the inner raceways in diameter d1m.

Rolling bodies 4 are also made of a two-stage type and are in contact with two sections of a larger stage Dwm2 with a raceway D1m of the outer ring, and three sections of a smaller stage with a diameter Dwm1.

The raceways of the inner ring 3 of the bearing are made with three grooves to form a gap with a large diameter Dwm2 of the rollers 2 and 4.

The rolling bearing, shown in figures 1 and 2, works as follows: when the shaft rotates, the ring 3 receives rotation, the rollers 2 and 4 interact with their sections of a lower stage with a diameter Dwm1 only with a raceway with a diameter d1m of the inner ring 3. Large diameters of the steps of the rollers Dwm2 interact only with the raceway of the outer ring 1 with a diameter of D1m. In this case, it is necessary that the assembly condition d1m / Dwm1 = D1m / Dwm2 = const (for example, 75.112 / 7.388 = 91.5 / 9 = 10.16) is satisfied, where Const is a constant number, which can be either an integer or a fraction depending on the dimensions of the bearing and its parameters.

It should be noted that this condition of assembly allows rolling elements 2 and 4 to run in raceways with a constant and the same speed, which ensures pure rolling without slipping. The noise during operation of the bearing is reduced by eliminating the slip of rolling elements.

The proposed rolling bearing can be installed without an outer ring in order to reduce dimensions.

These rolling bearings will increase the accuracy of the machines and improve the class of cleanliness and accuracy of machining parts without grinding after the cutter, as well as increase the bearing life due to reduced heat generation and noise. The bearing is capable of continuous operation under limited lubrication conditions.

Claims (1)

A rolling bearing containing inner and outer rings with raceways, rolling bodies located between them, made in the form of rollers installed in the seats of the separator, the rollers are made in two stages and the larger diameter of the stage contacts only the raceway of the outer ring of the bearing, and the smaller diameter of the stage only the raceway of its inner ring with a constant and the same rotational speed, while the condition for assembling the bearing must be met: d1m / Dwm1 = D1m / Dwm2, where d1m is the diameter of the raceways of the inner ring of the bearing; Dwm1 is the diameter of the lower roller stage; D1m is the diameter of the raceways of the outer ring of the bearing; Dwm2 - the diameter of the larger step of the roller, and the raceway of the inner ring of the bearing is made with a groove to form a gap with a large diameter of the roller step, characterized in that two additional grooves are made on the raceway of the inner ring of the bearing, and some of the rollers are made with two sections of a lower stage interacting with the raceways of the inner ring of the bearing , and one section of a larger stage interacting with the raceways of the outer ring, and part of the rollers are made with three sections of a lower stage, interacting mi with the raceways of the inner ring of the bearing, and two sections of a larger stage interacting with the raceway of the outer ring.

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