The way to control the size of the working surface of the ring double row angular contact ball bearings

 

(57) Abstract:

Use: for the treatment of work surfaces angular contact double row ball bearings by preselecting subject to measurement and mathematical processing of measurement results. The inventive control the radius of the gutter, then at an arbitrary axial section of the ring measure the diameter of the gutter and the sum of the distances from the axis of the ring before forming the trench, measured in a direct, components with perpendiculars to the axis of the ring contact angles in the bearing. Next, determine the deviation of the diameter Dd and the sum of the distances from the nominal values (P) , calculate the difference of the deviation of the indicated amounts and compositions of the deviation of the diameter of the cosine of the contact angle f = P-dcos . This difference f equal to the offset of the line of contact of the ring under the influence of the deviation of the radius and the axial position of the chute in a direction that forms a contact angle with the perpendicular to the axis of the ring. 8 Il.

The invention relates to the field of engineering, in particular to control the dimensions of the parts bearing on the operations of the working surface.

Widely known method consisting in measuring the diameter of the gutter, radius gutters and regulations GIEZ each of the dimensions separately and independently of the other (the Bearings./Ed. N. A. Spitsina, etc. M engineering, 1961, S. 700).

However, the accuracy of processing is that you can collect only single-row angular contact bearings, when high requirements for mutual axial location of the outer and inner rings are not required and the deviation of the contact angle associated with deviations of the radii of the grooves, are acceptable. In addition, the ring double row angular contact bearings formed only one side of the trench, and the measurement of the axial position of the gutter complicated.

There is a method by which control the diameter of the raceways of the outer and inner rings on the lines of contact of the rings and balls in the bearing, and the distance between the lines of contact between the outer rings and the distance from the base end to the line of contact between the inner rings. The diameter of the line of contact depends on three dimensions and is not of interest for operational control. The distance between the lines of contact or distance from the face to the line of contact carries information about the axial position of the center of curvature and radius of the gutter and can be used for setting the machine. However, the method does not contain tricks to measure the distance (ed. St. USSR N 540 is consequently, and precision machining work surfaces angular contact double row ball bearings due to the choice to be measured parameters and mathematical processing of measurement results.

To achieve this result in a way of controlling the size of the working surface of the ring double row angular contact ball bearings, consisting in measuring the parameters characterizing the surface of contact of the balls with the raceways of the inner and outer rings of the bearing, measure the diameter of the chute d and the sum of the distances from the axis of the ring to form a trench P, which are measured along lines located under the contact angle of the bearing , calculate the deviation of the diameter Dd and the sum of the distances of P from the nominal values, determine the parameter f

f = P-dcos,

where f is the offset of the line of contact;

P the deviation of the sum of the distances from the axis of the ring before forming the trench;

d deviation of the diameter of the gutter;

the contact angle bearing

and compare it to the allowable values.

The method allows to control when processing three sizes: the diameter of the gutter directly; the radius of the gutter directly and offset of the line of contact; the axial position of the gutter on the offset the Cove during the processing of the rings.

In Fig. 1 shows the outer ring of the double row angular contact ball bearing; Fig. 2 left inner ring; Fig. 3 right inner ring; Fig. 4 the scheme of measurement of the outer ring; Fig. 5 - the inner ring of Fig. 6 dimensional circuit for calculating distances from the axis of the ring to the line of contact of the outer rings of Fig. 7 is the same, but the inner rings; Fig. 8 algorithm computing the deviation of the diameter of the gutter and shift the line of contact.

For processing chutes double-row outer rings used for the simultaneous grinding of two grooves, so their dimension is small. In addition, for those bearing the most adverse operating mode is skewed when operating simultaneously at diametrically opposite points of the gutters.

In Fig. 4 presents the measurement scheme that takes into account the specifics of the outer ring 1. The diameter of the grooves is measured using the measuring heads 2 (A and B), and the distance from the axis to the line of contact with the heads 3 (C and D). When the ring 1 is based on an end face on three pillars 4 and the outside diameter of the two bearings 5.

The measurement scheme of the right and left inner rings 6 and 7 contains the measuring head 2 (A and B) and 3 (C and D), and the ring is based n the measurement of these distances (Fig. 6) are calculated according to formulas

< / BR>
where D is the diameter of the gutter outer ring;

R is the radius of the gutter outer ring;

L is the distance between the centers of curvature of the forming grooves of the outer ring;

a contact angle.

Similarly, for the inner ring 6 (Fig. 7)

< / BR>
where d is the diameter of the troughs of the inner ring;

r is the radius of the troughs of the inner ring;

l is the distance from the base end to the center of curvature of the generatrix of the gutter.

The dependence of the distance between a point of intersection of the axes of symmetry of the tangent to and forming a trench at the point of contact of the diameter, radius and axial position of the troughs of the outer ring:

PP1 l + g h,

where

< / BR>
Similarly, for the inner ring (Fig. 7)

PP11.1r m n,

where

< / BR>
Hence the computation algorithm, which allows to obtain the deviation of the diameter of the gutter and the offset to the line of contact does not depend on the variance of diameter and which is a function of the deviation of the axial position and radius of the gutter (Fig. 8). In accordance with the algorithm summed signals of the heads A and B, shall be deducted from the amount received its nominal value and thus get d deviation of the diameter of the gutter of the nominal value. At the same time summarize the signals of the heads C and D, you the CA to the gutter. Then they find works d the cosine of the contact angle. Then calculate the difference f = P-dcos/f (where f is the offset of the line of contact).

The value of f = P-dcos is the result of the measurement ring on the device that is configured to "0" as the channel "d" (A, B), and the channel P (C + D) exemplary details of the same nominal dimensions.

The parameter f does not depend on the variance of the diameter of the gutter, so when calculating tolerance sfsuppose d = 0.

By definition, tolerancef(fmax-fmin).

Obviously, when d = 0

fmax(PmaxPMr.)

fmin(PminPMr.)

thenf= Pmax-Pmin.

Based on the above description of the formula

P = P1.1+P1.2= dcos-2r(1-cos)-2lsin

record

.

< / BR>
where r and l the accuracy of the process on the radius and axial position of the gutter achieved when using measuring devices that implement the inventive method.

The way to control the size of the working surface of the ring double row angular contact ball bearings, consisting in measuring the parameters characterizing the surface of contact of the balls with the raceways of the inner and outer rings sarcophagii rings measure the diameter d of the trench and the sum of P distances from the axis of the ring to form a trench, which are measured along lines located under the contact angle of the bearing, calculate the deviation of the diameter Dd and the sum of the distances of P from the nominal values, calculate the parameter f according to the formula

f = P-dcos,

where f is the offset to the line of contact

and compare it to the allowable values.

 

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