JP2003139529A - Coaxial degree measuring method for bearing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coaxial degree measuring method capable of inexpensively and accurately measuring the coaxial degree of a bearing body without flawing it. SOLUTION: A cylindrical support component 4 having a diameter smaller than an inner diameter of the bearing body 1 with a bearing component 3 assembled on a cylindrical component 2 is brought into contact with the inner diameter of the bearing body, a distance L1 between the contact point A1 and an outer diameter part B1 of the bearing body facing it is measured, the measurement is conducted throughout the whole circumference of the bearing body, and the coaxial degree of the bearing body is determined by a difference between a maximum value MaxL1 and a minimum value MinL1 of the distance L1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the coaxiality between the outer circumference and the inner circumference of a cylindrical member having a hole in the center, and more particularly to a cylinder of a bearing body after the bearing part is assembled to a cylindrical part. The present invention relates to a method for measuring the coaxiality between the outer periphery of a shaped component and the inner periphery of a bearing component.

[0002]

2. Description of the Related Art Conventionally, the coaxiality of a bearing body 1 in which a bearing component 3 is assembled to a cylindrical component 2 is as shown in FIGS.
As shown in (c), pintage 5 and taper gauge 6 were used for measurement. However, FIG.
In the measurement using the pin gauge 5 matched to the inner diameter of the bearing body 1 as shown in Fig. 4, it takes time to select the optimum pin cage 5 that fits the inner diameter of the bearing body, or when the pin cage 5 is inserted into the inner diameter of the bearing body. Alternatively, there is a problem that the inner diameter of the bearing body is scratched. In addition, FIG.
As shown in (c), when measuring the coaxiality of the bearing body 1 using the taper gauge 6, the bearing body 1 and the taper gauge 6 are measured.
Since the contact state with is unstable, the taper gauge 6 tends to incline as shown in FIG. 5C, and the coaxiality cannot be measured accurately.

[0003]

SUMMARY OF THE INVENTION The present invention has been made based on the finding that the above-mentioned problems have arisen because the conventional measurement requires simultaneous and stable contact with the inner circumference of the bearing at multiple points at the same time. SUMMARY OF THE INVENTION It is an object of the present invention to provide a coaxiality measuring method capable of inexpensively and highly accurately measuring the coaxiality of a bearing body by supplying a measuring system capable of measuring the inner circumference of the bearing by one-point contact.

[0004]

The present invention provides a coaxiality measuring method as set forth in each of the claims as a means for solving the above problems. In the coaxiality measuring method according to claim 1, a supporting component having a diameter smaller than the inner diameter of the bearing body is brought into contact with the inner diameter of the bearing body, and the distance L1 between the contact point A1 and the outer diameter portion B1 of the bearing body facing the contact point A1. Is measured over the entire circumference of the bearing body, and the concentricity of the bearing body is obtained from the difference between the maximum and the minimum of this distance L1, so that the bearing parts are not damaged. The coaxiality of the bearing body can be measured inexpensively and with high accuracy.

According to the coaxiality measuring method of the second aspect, a groove having a V-shaped cross section or an arcuate groove is formed on the outer periphery of the support component in order to easily hold the spherical portion of the spherical bearing. Even if is a spherical bearing, the coaxiality of the bearing body can be stably and accurately measured. The coaxiality measuring method according to claim 3,
An outer diameter portion B2 is a point where an extension line between the contact point A1 and the outer diameter portion B1 of the bearing body intersects with the outer circumference of the bearing body, and a distance L2 between the contact point A1 and the outer diameter portion B2 is also the entire circumference of the bearing body. It is possible to measure the outer diameter and the inner diameter of the bearing body from the average value of L1 + L2 and L2-L1 at the same time as the measurement of the coaxiality of the bearing body by measuring over the range.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A coaxial measuring method according to an embodiment of the present invention will be described below with reference to the drawings. 1A is a diagram for explaining the coaxiality measuring method according to the embodiment of the present invention, and FIG. 1B is a sectional view taken along the line I-I of FIG. 1A. In the present embodiment, the bearing body 1 in which the bearing component 3 is assembled to the cylindrical component 2 is described as the target of the coaxiality measurement, but the cylindrical component and the single bearing component are also the same. Of course, it is possible to measure.

As shown in FIG. 1A, a straight line T extending from the center of the outer diameter of the bearing body 1 in which the bearing component 3 is assembled to the cylindrical part 2 or the vicinity of the center of the outer diameter and the bearing body 1
The two points where the inner circumference intersects are A1 and A2, and this straight line T
At two points B1 and B2 where the outer circumference of the bearing body 1 intersects with each other, a point facing the point A1 is B1, and a point facing the point A2 is B.
2, the columnar support component 4 having a diameter smaller than the inner diameter of the bearing body 1 is inserted into the bearing body 1, and the point A
1, the inner diameter of the bearing body 1 and the support component 4 are arranged to be in contact with each other. This support component 4 has a high roundness and its center position is known. Further, the support component 4 may have a spherical shape instead of a cylindrical shape.

In this case, in order to ensure the contact between the bearing body 1 and the supporting component 4 at the point A1, a load may be applied to the side where the inner diameter of the bearing body is pressed against the point A1. Further, as a pressing jig (not shown) for applying a load, for example, a structure in which the load is not so much applied in the tangential direction of the outer circumference of the bearing body by, for example, making the tip a roller, is described below. Is stable, which is desirable.

In the arrangement of the bearing body 1 and the support component 4 shown in FIGS. 1A and 1B, the position of the support component 4 is fixed, and the bearing body 1 and the support component 4 are further fixed. The above point B1 and point A when the bearing body 1 is rotated while maintaining contact.
The distance L1 from 1 is measured by, for example, a displacement meter (displacement sensor, dimension measuring device) 7. Here, the displacement meter 7 is an optical type (laser focus type or triangulation type), a laser transmission type, an eddy current type, an ultrasonic type, a contact type, or any other type capable of measuring the displacement amount (dimension). It is a measuring instrument.

The distance L1 between the point B1 and the point A1 can be represented by the rotation angle θ of the bearing body 1 as a variable.
When L1 (θ) is set as shown in (a) and (b), the coaxiality of the bearing body 1 is the difference between the maximum and the minimum of L1 (θ). That is, it can be expressed by the formula of coaxiality = MaxL1 (θ) −MinL1 (θ). Here, when the inner diameter of the bearing outer ring of the bearing component 3 is D and the outer diameter of the bearing roller is d, the rotation angle θ is θ ≧
It is desirable that it is 2π, and it is desirable that θ = 2πiD / d, where i is a natural number. In addition, D / d
Is a condition that an arbitrary roller makes one round around the inner diameter of the bearing outer ring.
When the bearing part is press-fitted into the cylindrical part, the inner diameter of the outer ring of the bearing is slightly deformed. Therefore, the center position of the inscribed circle (inscribed circle with the roller) of the bearing is not uniquely determined, and as a result, the coaxiality is not uniquely determined. Therefore, in the case of obtaining the variation or the average of the coaxiality, it is desirable that θ ≧ 2π in the present measurement method. Further, since the diameters of the rollers also vary, it is desirable to perform processing such as averaging at the time when the rollers go around the inner diameter of the outer ring in order to accurately measure the coaxiality. Assuming that no slip has occurred between the roller and the inner diameter of the outer ring of the bearing, the condition that the roller goes around the inner diameter of the outer ring is D
Therefore, θ = 2πiD / d can be cited as a condition for accurate measurement of coaxiality in this measurement. In this way, the coaxiality of the bearing body 1 can be measured.

FIG. 2A is a diagram for explaining a coaxiality measuring method according to another embodiment of the present invention, and FIG. 2B is a diagram showing (a).
11 is a sectional view taken along line II-II of FIG. In this embodiment, in addition to the measurement of the coaxiality of the bearing body 1, the outer diameter or the inner diameter of the bearing body 1 is measured. The measurement of coaxiality is similar to the method described above. In order to measure the outer diameter and the inner diameter of the bearing body 1, in this embodiment, in addition to the distance L1 between the point A1 where the straight line T and the inner circumference of the bearing body 1 intersect and the point B1 where the outer circumference of the bearing body 1 intersects. Then, the distance L2 between this point A1 and the other point B2 where the straight line T intersects with the outer circumference of the bearing body 1 is measured. This distance L
In the measurement of 2 as well, by rotating the bearing body 1 while maintaining the contact between the inner diameter of the bearing body 1 and the support component 4 as in the case of the distance L1, the same displacement gauge 7 is provided over the entire circumference of the bearing body 1. Use to make measurements.

In this case, the distance L2 is also expressed by using the rotation angle θ of the bearing body 1 as a variable, and the outer diameter of the bearing body 1 is L1 (θ).
It can be calculated from the average of + L2 (θ), and the inner diameter of the bearing body 1 is
It can be calculated from the average of L2 (θ) -L1 (θ). That is,
Outer diameter = Σ {L1 (θ) + L2 (θ)} / N, inner diameter = Σ
{L2 (θ) −L1 (θ)} / N; N = number of times of measurement As described above, in the present embodiment, the outer diameter or the inner diameter of the bearing body 1 is measured together with the coaxiality of the bearing body 1.

In the measuring method described above, the support component 4
A cylindrical or spherical part is used as this, and this shape is suitable for the measurement of a bearing body assembled with a needle-shaped bearing part as shown in FIG. Reference numeral 31 is an outer ring of the needle bearing component, reference numeral 32 is a roller of the same component, reference numeral 33
Is a retainer of the same component. FIG. 4 shows a modification of the support component 4 when a spherical bearing is used as the bearing component 3. In this modification, a groove 41 having a V-shaped cross section is formed on the outer periphery of the support component 4. This allows
Since the spherical portion 34 of the spherical bearing is held in the groove 41, it is possible to accurately measure the spherical bearing. Further, the groove may have an arcuate cross section instead of the V-shaped cross section.

In the above description of the embodiment, the bearing body is measured in one section, but not only in one section but also in a plurality of sections, three-dimensional measurement is possible. Can also be deployed. Further, the coaxiality measuring method of the present invention can measure the outer diameter, inner diameter and coaxiality of a cylinder not only in a bearing body but also in a cylindrical part, and further, the circularity of the following outer diameter = [Max { L1 (θ) + L2 (θ)}-
Min {L1 (θ) + L2 (θ)}] / 2 Roundness of inner diameter = [Max {L2 (θ) −L1 (θ ± π /
2)}-Min {L2 (θ) -L1 (θ ± π / 2)}]
The circularity of the outer diameter and the circularity of the inner diameter can also be measured by / 2.

As described above, since the coaxiality measuring method of the present invention can be measured by one-point contact with the inner circumference of the bearing component, the bearing component is not damaged and the coaxiality can be obtained inexpensively and with high accuracy. Can be measured.

[Brief description of drawings]

FIG. 1A is a diagram illustrating a coaxiality measuring method according to an embodiment of the present invention, and FIG. 1B is a sectional view taken along line I-I of FIG.

FIG. 2 (a) is a diagram illustrating a coaxiality measuring method according to another embodiment of the present invention, and FIG. 2 (b) is a II-II of (a).
It is a line sectional view.

FIG. 3 is a cross-sectional view of a needle bearing that is a bearing component.

FIG. 4 is a modification of the support component when a spherical bearing is used as the bearing component.

5A and 5B respectively show a conventional coaxiality measuring method, in which FIG. 5A shows a case where a pin gauge is used, FIG.
(C) shows the case where a taper gauge is used.

[Explanation of symbols] 1 ... Bearing body 2 ... Cylindrical parts 3 ... Bearing parts 4 ... Supporting parts 7 ... Displacement meter

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhiko Yamazaki             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO F term (reference) 2F069 AA21 AA39 AA40 AA56 BB08                       CC03 DD25 GG01 GG04 GG06                       GG07 GG09 GG52 GG62 HH02                       HH09 JJ17 JJ25 LL04 MM02                       MM21 NN26                 3J101 AA01 AA02 AA12 AA52 AA62                       EA01 FA25 FA31

Claims (3)

[Claims] 1. A method for measuring the coaxiality between an outer diameter and an inner diameter of a bearing body in which a bearing component is assembled to a cylindrical component, comprising a cylindrical or spherical support component having a diameter smaller than the inner diameter of the bearing body. After making contact with the inner diameter of the bearing body and measuring the distance L1 between the contact point A1 and the outer diameter portion B1 of the bearing body facing the contact point A1, this measurement is performed over the entire circumference of the bearing body, and then this distance is measured. Max L1 and minimum Mi of L1
A coaxiality measuring method, wherein the coaxiality of the bearing body is obtained from the difference from nL1. 2. When the bearing component of the bearing body is a spherical bearing, a V-shaped or arc-shaped groove is formed on the outer periphery of the support component to facilitate holding of the spherical portion of the spherical bearing. The coaxiality measuring method according to claim 1. 3. The contact point A1 and the outer diameter portion B of the bearing body.
1 is an outer diameter portion B2 at a point where an extension line with 1 intersects with the outer circumference of the bearing body, and a distance L between the contact point A1 and the outer diameter portion B2.
2 is measured, and this measurement is performed over the entire circumference of the bearing body, and the outer diameter of the bearing body is measured from the average value of L1 + L2, or the inner diameter of the bearing body is measured from the average value of L2-L1 at the same time. The coaxiality measuring method according to claim 1 or 2, wherein.