SU1278509A1 - Method for selecting sets of components for assembling radial thrust ball bearings - Google Patents

Abstract

This invention relates to a bearing industry. The goal is to improve the accuracy and performance of the assembly of angular contact ball bearings. The assembly is dried according to the difference in the diameters of the grooves of the rings and the average radial clearance. A certain size of the ball corresponds to a certain value of mixing, the center of the ball relative to the axis of the ring groove. 2 hp f-ly, 1 ill.

Description

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The invention relates to the bearing industry and can be advantageously used for the assembly of bearing parts before assembly.

The aim of the invention is to improve the accuracy and productivity of assembling angular contact bearings.

The drawing is given a structural diagram of the bearing.

The essence of the proposed method lies in the fact that the acquisition of bearings is performed by measuring the diameters of the raceways of the rings with a call to the required size group of balls, similar to the method used, the assembly of ball radial single bearings, but taking into account the average radial clearance required for a given (defined) group of balls according to addiction

D, -di 2Dw + F,

where Ftp is the average radial clearance defined for a given size group of balls.

The magnitude of the average radial clearance for a given size group of balls is determined from the relationship:

Yeshi, 2 (2R “m,) (1-cospo);

Eat .. (2Kzhm1, ks-Dw) (1-cospo);

pl-mini-j- bmax

Lp 2

where EMNI, tiuiKc is the minimum and maximum values of the radial clearance for a specific (given size group of balls);

2R "Mnii; 2Nzhmakk1- - the minimum and maximum values of the sizes of the radii of the grooves of the outer and inner rings (2R Rn- | + RR).

A certain size of the ball corresponds to a certain value of mixing the center of the ball relative to the axis of the groove of the ring g, i.e.

mnn 2R) "MHM-D) sinpo;

gMaKC (2R KMaKoDw) sinpo;

gMnH-j-gMaKLSo, each defined size of the balls corresponds to a certain average size of the radial gap and a certain known average displacement of the axis of the grooves of the rings relative to each other.

In order to clearly distribute the podshpnikov across the radial clearance and axial displacement of their components, the design is performed as follows.

From the measured difference in the diameters of the raceways of the rings, the required size of the ball is determined (taking into account the average radial clearance corresponding to the given ball) and the set is placed in a certain cell. After assembling the kit, it is also placed in a certain cell of the corresponding clearance and axial displacement.

Example. Details of the 66310K bearing have the following dimensions: Radius of the grooves of the outer and inner rings: R

 ten,. Ball diameter DW 19,844 ± 0 ° 5 MM, diameter of the raceway of the outer ring; Dj 99.958 ± 0.025 mm, the diameter of the raceway of the inner ring (di 60.042 ± 0.025 mm, contact angle). By the formulas

Рми „2 (2Rжv, in - DV XI-cos o); max 2 (2R, Ma.c; -Dv.-) (1-cos o);

Icp 0.5 (gMiiH- | -gMa4c)

the mean radial clearance value is determined for all ball sizes with an interval of 1 micron.

According to the formula 0 gM ,, H () 3inpo;

gMaKc (2Rж-D v) sipo;

Cfcp 0,5 (gmi1 | - -Rmax) o oO

determines the axial value of the displacement of the axes of the grooves of the rings relative to each other for

5 each size of balls with an interval of 1 micron.

From the nominal sizes of the diameters of the raceways of the rings, the difference in their diameters is determined, which corresponds to the sum of the average radial clearance with doubled

0 ball diameter

DI -di B + 2D, T.e. 39,916.

The value obtained is determined by

ball size required

for picking memorial sizes

rings on the diameter of the gutter, equal 19,780 mm.

Similarly, the boundary dimensions of the balls needed to assemble rings with a deviation of ± 0.025 mm are determined. With a maximum size difference on the outer and inner ring raceway, the size of the ball is 39.966, which corresponds to a ball size of 19.813 mm, and with a minimum size of 39.866, the size of the ball is 19.747 mm.

The proposed method of picking and assembling angular contact ball bearings allows to increase the accuracy of picking and to obtain significant economic efficiency.

Claims (3)

Invention Formula The method of completing parts for the assembly of angular contact ball bearings, which consists in measuring the diameters of balls and the diameters of the raceways of the rings in a normal section, sorts them into dimensional groups, characterized in that, in order to increase the accuracy and productivity of the assembly of the radially resistant boreholes, the difference in the diameters of the raceways of the rings is measured and, according to its size, the ball is selected with regard to the radial clearance required for it, in accordance with the dependence D, -di 2Dl + fcp, where the average radial clearance r Gmin - | - Enak. L F2 Gmi „2 (2Nzh“ and „- DW) (1-со5 | 3); «Ax 2 (2Nzhmaks -). (1 -COSp f "), where DI and di are the diameters of the raceways of the outer and inner rings; DW - ball diameter; 2Нж - the radii of the grooves of the outer and inner rings of the completed bearings; Emimi Mays. - the minimum and maximum values of the radial clearance; RNOM - the nominal value of the contact angle. 2. A method according to claim 1, characterized in that ball bearings with the same ball size are completed with the same radial clearance. 3. The method according to claim 2, characterized in that ball bearings with the same diameter of the balls are completed with the same axial mixing in accordance with the dependence gviiM (2Kgmimi-D ") sinprto, gunKC (2R MiiKC) sinpHoM; +  g one gcp - minimum, maximum and average axial mixing of the gutters of the rings relative to each other. J3.