RU2259503C2 - Roller spherical bearing - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: roller spherical bearing comprises outer race with spherical or toroidal race way, inner race with one or several toroidal race ways, one or several rows of barrel-shaped rollers, and at least one separator with cross pieces that define ports for setting rollers. The wall of the port defined by the cross-piece is composed of two surfaces. One of the surfaces is cylindrical, and the other one is concave and trapezoidal. The line of the intersection of the surfaces is located above the axis of the roller. The radius of generatrix of the concave toroidal surface issues out of the center of the roller generatrix and is greater than its radius.

EFFECT: enhanced reliability and increased durability.

5 dwg

Description

The invention relates to the field of engineering, in particular to rolling bearings.

Known spherical roller bearing according to the author's certificate of the USSR No. 1109545, F 16 C 33/46, publ. 1984 y. / 1 /.

The bearing contains an outer ring with a spherical raceway, an inner ring with a toroidal raceway, barrel-shaped rollers and a cage with windows for their placement, their size in the middle of which is smaller than the diameter of the roller in the middle section, which serves as a kind of "lock" and holds the rollers in the radial direction . However, holding the roller is carried out by four points and during mounting and assembly of the bearing allows the roller to warp in the radial direction. When the bearing is operated with this separator, the rollers are guided by four points, which leads to uneven wear and creasing of the jumper surface, and as a result of deterioration of the bearing characteristics - reliability and durability.

A known cage for a roller bearing according to US patent US 2805108, 308-217, publ. 1957/2 /.

The separator contains a series of windows separated by jumpers having protrusions and flat working surfaces forming the walls of the window. There is a small gap between the flat surfaces of the lintels and the rollers, allowing the rollers to rotate freely. The protrusions are located in the center of each jumper and consist of two surfaces, one of which is parallel to the plane of the axis of the jumper, and the second extends from the first into the separator. The protrusions serve as a holding portion and prevent the roller from moving radially outward without the application of force. The retaining section of the jumper of the separator has a small length, which can lead to skewing of the rollers in the radial direction during installation and assembly of the bearing. The contact of the jumper and the roller takes place along the line, which means that it has a small area, which in turn leads to an increase in contact stresses and an increase in the wear of the separator, which leads to a deterioration in the bearing characteristics - reliability and durability.

The technical problem, the solution of which the invention is directed, is to increase the reliability and durability of the bearing by increasing the length of the coverage of the roller with a jumper and the area of their contact

The problem is solved in that in a spherical roller bearing containing an outer ring with a spherical or toroidal raceway, an inner ring with one or more toroidal raceways, one or more rows of barrel-shaped rollers located between the raceways of the rings, at least one cage with jumpers, forming windows for placing the rollers, according to the invention, the wall of the window formed by the jumper consists of two surfaces, one of which is cylindrical, and the second in bent toroidal, the line of intersection of which is located above the axis of the roller. The axis of the toroidal surface coincides with the axis of the roller, and the radius of the generatrix of the concave toroidal surface leaves the center of the generatrix of the roller and exceeds it by an amount determined by the dependence;

where Δ is the value by which the radius of the generatrix of the toroidal surface of the jumper of the separator is greater than the radius of the generatrix of the roller;

B is the distance between the intersection lines of the cylindrical and toroidal surfaces of the bridges in the plane of the largest diameter of the roller,

Dw is the largest diameter of the roller,

Gr is the radial clearance in the bearing.

The invention is illustrated by drawings.

1 shows an axial section of a spherical roller bearing;

figure 2 shows an isometric view of the jumper of the separator;

figure 3 shows a section of the bearing along the plane of the largest diameter of the roller;

figure 4 shows a cross section of the separator BB in figure 3;

figure 5 shows a fragment of a separator with a roller.

A spherical roller bearing with a radial clearance Gr contains an outer ring 1 with a spherical raceway 2, an inner ring 3 with two toroidal raceways 4, two rows of barrel-shaped rollers 5 with the largest diameter Dw, two cages 6 with windows 7 and jumpers 8 between them. The wall of the window 7, formed by the jumper 8, consists of two surfaces: a cylindrical 9 and a concave toroidal 10. The concave toroidal surface 10 is the working section of the jumper 8. The axis O ₁ O _{1 of the} toroidal surface 10 coincides with the axis O ₂ O _{2 of the} roller 5, and the radius Rt toroidal concave forming surface 10 emerges from the center O ₃ 12 forming roller 5. The line of intersection 13 of the cylindrical surface 9 with the toroidal surface 10 is located above the axis O ₂ O ₂ yavlyaetcya roller 5 and the retaining portion bridges 8. The distance between the lines n intersection 13 of the surfaces 9 and 10 of adjacent webs 8 in the plane of the largest diameter Dw roller 5 is equal to B. The radius Rt toroidal surface 11 the generatrix 10 of the working portion 10 larger than the radius R 12 forming roller 5 by an amount Δ. The value of Δ is determined as follows (see figure 3).

During operation of the bearing, the roller 5 under the action of centrifugal forces F moves from a position with a center O ₄ to a position with a center O ₅ . In this case, the generatrix 12 of the roller 5 is in contact with the line 13 of the intersection of the surfaces 9 and 10. The distance O ₄ O ₅ is equal to half the radial clearance Gr / 2. From point O ₅ draw a line to point C, which lies on line 13 of the intersection of surfaces 9 and 10. From point C, drop the perpendicular to point E to continue the axis O ₄ O ₅ . From the center O ₄ we draw a line to point C. The desired value Δ is equal to the difference between the radius Rt of the generatrix 11 of the surface 10 and the radius R of the generatrix 13 of the roller 5, that is, as can be seen from figure 3 - the difference between the segments O ₄ C and O ₅ C :

Δ = O ₄ CO ₅ C, (1)

From the triangle O ₄ CE we find O ₄ C:

Where

O ₄ E = O ₄ O ₅ + O ₅ E (3)

From the triangle O ₅ CE we find O ₅ E:

then formula (3) will take the form:

Substituting (5) in (2), we obtain:

We determine the value of Δ by the formula (1):

Substituting the values CE = B / 2, O ₄ O ₅ = Gr / 2, O ₅ C = Dw / 2 in the formula (7), we obtain:

When assembling and mounting the bearing, the inner block (inner ring 3, assembled with rollers 5 and cages 6) is turned out relative to the outer ring 1. The roller 5, covered by a spherical raceway 2 of the outer ring 1, under the influence of its own weight falls to the line 13 of the intersection of surfaces 9 and 10 and is in contact with it. Due to the fact that the line of intersection of surfaces 13 disposed above the axis O ₂ O ₂ roller 5, it is jumper holding portion 8 and serves as a "lock", preventing the precipitation of the roller 5 of the block. Coverage of the roller 5 "lock" occurs along the entire length of the jumper 8 of the separator 6 and does not allow the roller 5 to warp during installation.

During operation of the bearing, the roller 5 is driven by the entire toroidal surface 10 of the jumper 8 of the separator 6.

Due to the implementation of the working section of the jumper 8 of the separator 6 with a toroidal surface 10, the shape of the jumper 8 is close to the shape of the roller 5. Moreover, their contact occurs on the surface, which can significantly increase the contact area and, as a result, reduce contact stress and wear.

All of the above factors can improve the characteristics of the bearing - reliability and durability.

Information sources

1. USSR author's certificate No. 1109545, F 16 C 33/46, publ. 1984 year

2. US patent US 2805108, 308-217, publ. 1957

Claims (1)

Spherical roller bearing comprising an outer ring with a spherical or toroidal raceway, an inner ring with one or more toroidal raceways, one or more rows of barrel-shaped rollers located between the raceways of the rings, at least one cage with jumpers forming windows for placement rollers, characterized in that the window wall formed by a jumper consists of two surfaces, one of which is cylindrical and the second concave toroidal, the line of intersection to toryh located above the roll axis, the radius of the toroidal concave forming surface exits the forming roller and the center exceeds it by an amount determined dependent

where Δ is the value by which the radius of the generatrix of the toroidal surface of the jumper of the separator is greater than the radius of the generatrix of the roller; B is the distance between the intersection lines of the cylindrical and toroidal surfaces of the lintels in the plane of the largest diameter of the roller; Dw is the largest diameter of the roller; Gr is the radial clearance in the bearing.

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