JP5185748B2 - Measuring method of metal ring circumference - Google Patents

Description

  The present invention relates to a method for measuring the circumferential length of an endless belt-like metal ring used for a belt of a continuously variable transmission or the like.

  A belt used for power transmission of a continuously variable transmission (CVT) or the like is configured by assembling a plurality of elements on a laminated ring obtained by laminating a plurality of endless belt-like metal rings in the thickness direction thereof. This type of laminated ring is basically manufactured so that its circumference and radius are the design values (which differ from each other for each layer), but it does not always match the design values with high accuracy. In general, a certain amount of variation occurs mainly in the design value due to manufacturing errors. For this reason, when combining and laminating | stacking the metal ring of each said layer, after manufacturing the metal ring of each layer, circumference is separately measured and a lamination | stacking ring is assembled based on the data.

  Conventionally, the circumference of a metal ring is measured by applying a tension to the metal ring by moving the metal ring around a pair of rollers and moving at least one roller away from the other roller. The distance is measured, and the circumference of the metal ring is calculated from the distance between both rollers (see, for example, Patent Document 1).

  In the circumference measurement, since the metal ring is laminated in the thickness direction and assembled into a laminate ring, if the circumference is outside the allowable range with respect to the design value, the metal ring is turned into a laminate ring. Cannot be used. Therefore, it is desirable that the circumference is a value within an allowable range with respect to the design value.

However, according to the circumference measuring method, since the calculated circumference varies greatly, the circumference is a value outside the allowable range with respect to the design value, and the occurrence of a metal ring that cannot be used for the laminated ring occurs. There is an inconvenience that it cannot be avoided.
JP 2002-156220 A

  An object of the present invention is to provide a method for measuring the circumference of a metal ring that eliminates such disadvantages and can accurately measure the circumference of the metal ring.

  As a result of earnestly examining the reason why the variation in the circumference becomes large in the circumference measurement method, the relationship between the magnitude of the curvature of the arc shape of the metal ring and the curvature of the arc shape of the pair of rollers, It has been found that the calculated circumference may be longer or shorter than the actual size. That is, the pair of rollers around which the metal ring is wound are provided with an arc shape in which the central portion is convex outward in the cross-sectional view in the width direction on the outer peripheral surface in order to apply tension to the metal ring. . On the other hand, as shown in FIG. 2, the metal ring W has a central portion facing outward in a cross-sectional view in the width direction on the outer peripheral surface in order to easily maintain the laminated state when assembled into the laminated ring. And an arcuate shape Wa that is convex. Although the circular arc shape Wa is formed to have a predetermined curvature, the curvature varies depending on the circumferential position of the metal ring W. Therefore, according to the circumference measurement method, the circumference measurement is performed only once, depending on the relationship between the curvature of the arc shape Wa of the metal ring W and the curvature of the arc shape of the pair of rollers. It is considered that the variation in circumference becomes large.

  As a result of further studies based on the above findings, the present inventors have reached the present invention.

Therefore, in order to achieve the above object, the present invention provides a metal ring having an arc shape with a central portion protruding outward in a cross-sectional view in the width direction on the outer peripheral surface, and a cross-sectional view in the width direction on the outer peripheral surface. The tension is applied to the metal ring by moving it around a pair of rollers having a circular arc shape whose central portion is convex outward and moving at least one of the rollers away from the other roller. And measuring the distance between the two rollers and calculating the circumference of the metal ring from the distance between the two rollers, wherein one part of the metal ring is at a predetermined position between the two rollers. And calculating the circumference of the metal ring when the other part of the metal ring is at the predetermined position, and calculating the circumference of the metal ring at least once. All metal rings The average value of the circumferential length, characterized in that the circumferential length of the metal ring.

  In the present invention, first, the metal ring is wound around the pair of rollers, and at least one roller is moved away from the other roller, thereby applying tension to the metal ring. Next, when one portion of the metal ring to which tension is applied is at a predetermined position between the two rollers, the distance between the two rollers is measured, and the circumference of the metal ring is determined from the obtained distance between the two rollers. Calculate the length. However, it is not possible to say that the calculated circumference has a large variation and shows the actual size with a single measurement.

  Therefore, once the circumference is calculated, the distance between the two rollers is measured when the other part of the metal ring is at the predetermined position, and the circumference of the metal ring is calculated at least once. Do. Next, an average value is calculated from the calculated circumferences of all the metal rings, and the average value is set as the circumference of the metal ring.

  According to the present invention, the process of calculating the circumference of the metal ring is performed at least twice when different portions of the metal ring are at predetermined positions between both rollers, and the average of all obtained circumferences Since the value is the circumference, the circumference of the metal ring can be accurately measured even when the curvature of the arc shape of the metal ring varies depending on the position in the circumferential direction of the metal ring.

  In addition, the accuracy of the calculation of the circumference of the metal ring can be increased by performing as much as possible. However, as the number of processes increases, an increase in cost is unavoidable. Therefore, in the present invention, it is preferable to perform the process of calculating the circumference of the metal ring at least three times. Thereby, the circumference of the metal ring can be measured with sufficient accuracy without increasing the cost.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is an explanatory front view showing a metal ring circumference measuring apparatus for carrying out the metal ring circumference measuring method of the present embodiment, FIG. 2 is a sectional view of the metal ring, and FIG. It is explanatory plan view which shows a circumference measurement position. FIG. 4 is a graph showing the circumference measurement error of the metal ring, and FIG. 5 is a graph showing variation in the circumference measurement error of the metal ring.

  A metal ring circumference measuring device 1 shown in FIG. 1 measures the circumference of an endless belt-like metal ring W for constituting a continuously variable transmission belt. The driving roller 2 and the driven roller 3 as the above-mentioned rollers, a tension cylinder 4 that applies tension to the metal ring W, and a measuring means 5 that detects the distance between the axes of the rollers 2 and 3 are provided.

  The metal ring W is made of high-strength steel such as maraging steel, and as shown in FIG. 2, the outer peripheral surface has an arcuate shape Wa whose center portion is convex outward in a cross-sectional view in the width direction. The curvature of the arc shape Wa varies depending on the circumferential position of the metal ring W.

  The driving roller 2 and the driven roller 3 have the same diameter, are provided at a predetermined interval in the horizontal direction, and the metal ring W is wound around. The driving roller 2 and the driven roller 3 have an arc shape on the outer peripheral surface, with a central portion protruding outward in a cross-sectional view in the width direction. This arc shape is formed in a size different from the curvature of the arc shape Wa of the metal ring W.

  The drive roller 2 is rotationally driven by the operation of a motor 7 connected to the drive roller bearing member 6. The driven roller 3 is attached to the tip of the cylinder rod 4 a of the tension cylinder 4 and is supported by a shaft support member 9 that is slidable along the guide rail 8. The driven roller 3 can be displaced by the tension cylinder 4 in a direction away from the driving roller 2 along the guide rail 8.

  The tension cylinder 4 displaces the driven roller 3 in a direction away from the driving roller 2, thereby extending the metal ring W wound around the rollers 2 and 3 to apply tension.

  The shaft support member 9 includes an abutting member 10 with which the tip of the measuring means 5 abuts, and the abutting member 10 is provided to protrude outward. The measuring means 5 detects the amount of displacement of the driven roller 3 that moves along the guide rail 8 and measures the inter-axis distance between the rollers 2 and 3.

  In the metal ring circumference measuring device 1, tension is applied to the metal ring W by the tension cylinder 4, but weights, springs, or the like may be used instead of the tension cylinder 4.

  Next, the measuring method of the metal ring of this embodiment is demonstrated, referring FIG. In the metal ring circumference measuring device 1, the metal ring W is wound around the driving roller 2 and the driven roller 3 in a state where the driven roller 3 is brought close to the driving roller 2.

  Next, the tension roller 4 moves the driven roller 3 along the guide rail 8 in a direction away from the driving roller 2, thereby applying tension to the metal ring W to put the metal ring W in a tensioned state.

Next, the motor 7 is operated, and the metal ring W to which tension is applied is rotated between the driving roller 2 and the driven roller 3 by the rotational driving of the driving roller 2. Then, as shown in FIG. 3, a measurement reference marker M serving as a reference for circumference measurement is provided at a position between the rollers 2 and 3 and facing the metal ring W wound around the rollers 2 and 3. Assuming that the portion P _{1 of the} metal ring is at the position of the measurement reference marker M, the measuring unit 5 detects the interaxial distance between the rollers 2 and 3. Next, the first circumference of the metal ring W is calculated from the inter-axis distance between the rollers 2 and 3 and the diameter of each roller 2 and 3.

Next, the second time when another part P ₂ different from the part P ₁ where the inter-axis distance between the rollers 2 and 3 is detected in the _first circumference calculation is at the position of the measurement reference marker M The metal ring W is circulated so that the circumference is calculated.

Next, in the same manner as the first circumferential length calculation, it detects the center distance between the rollers 2 and 3 when another part P ₂ of the metal ring W circulating is in the position of the measurement reference marker M, The second circumference of the metal ring W is calculated.

As described above, when the different portions P ₁ , P ₂ ,... Of the metal ring W are at the position of the measurement reference marker M, the inter-axis distance between the rollers 2 and 3 is detected, and 1 of the metal ring W is detected. The circumference of the second time, second time,... Is calculated. The process for calculating the circumference of the metal ring W is performed at least three times.

  Next, an average value is calculated from all the calculated circumferences, and the average value is set as the circumference of the metal ring W.

According to the circumference measurement method of the metal ring of this embodiment, the process of calculating the circumference of the metal ring W when different portions P ₁ , P ₂ ,... Of the metal ring W are at the position of the measurement reference marker M. Is performed at least three times, and the average value of all the obtained circumferences is defined as the circumference. Therefore, even when the curvature of the arc shape Wa of the metal ring W varies depending on the position of the metal ring W in the circumferential direction, the circumference of the metal ring W can be accurately measured.

In the present embodiment, when each circumference calculation is performed so that each circumference calculation is performed when different portions P ₁ , P ₂ ,... Are at the position of the measurement reference marker M, the metal ring W is circulated between each circumference calculation. However, instead of rotating the metal ring W, the motor 7 is stopped between the calculation of the respective peripheral lengths, the rotation of the metal ring W is stopped, and the metal ring W is applied again to the rollers 2 and 3. Good.

Next, the result by the circumference measurement method of the metal ring of this embodiment is shown. First, as described above, the metal ring W, was first circumferential length calculation when site P ₁ of the metal ring W is positioned on the measurement reference marker M.

Next, after the metal ring W is applied again to the rollers 2 and 3, it is 2 when another part P _{2 that} is separated by d = 10 mm from the part P _{1 for} which the first circumference calculation is performed is positioned at the positioning marker. The circumference was calculated for the second time. Thereafter, similarly, the site _{P 3,} P 4 which differ from each other by 10mm apart from each other, _..., as _{P 10} is positioned on the measurement reference marker M, at a peripheral length calculating a total of 10 times.

  Next, by calculating the average value in order for the circumference obtained in the first, second, ..., tenth circumference calculation, the average value is obtained by the first, second, ..., tenth circumference measurement. It was a perimeter. For example, the average value of the circumference obtained by calculating the circumference of the first and second times is set as the circumference by the measurement of the second circumference, and the average value of the circumference obtained by the first to third circumference is the third time. The circumference was measured by measuring the circumference. However, the circumference obtained by the first circumference measurement was the circumference obtained by the first circumference calculation. And the measurement error of the circumference of the metal ring W obtained by each circumference measurement and a design value was investigated. The above process was similarly performed on all 32 metal rings W. The results are shown in FIG. Also, the variation in measurement error is shown in FIG.

  FIG. 4 shows that the measurement error is very large in the range of -0.004 to 0.004 mm in the first circumference measurement, but is sufficient in the range of -0.0008 to 0.0006 mm in the third circumference measurement. It is obvious that the measurement of the circumference at the 10th time is very small, in the range of -0.0004 to 0.0004 mm. Also, from FIG. 5, the measurement error variation is very large as 0.008 in the first circumference measurement, but is sufficiently small as 0.0014 in the third circumference measurement, and in the tenth circumference measurement. It is clear that it is very small as 0.0008.

  Therefore, according to the circumference measurement method of the metal ring of this embodiment, one circumference measurement cannot be accurately performed due to the influence of variation in the curvature of the arc shape of the metal ring. It is clear that measurement can be performed accurately without being affected by the variation by performing the measurement more than once. Further, according to the metal ring circumference measuring method of the present embodiment, it is apparent that the measurement can be performed with sufficient accuracy in three times without performing ten times.

The explanatory front view showing the circumference measuring device for metal rings which performs the circumference measuring method of the metal ring of this embodiment. Sectional drawing of a metal ring. An explanatory plan view showing a circumference measurement position of a metal ring. The graph which shows the circumference measurement error of a metal ring. The graph which shows the dispersion | variation in the circumference measurement error of a metal ring.

Explanation of symbols

2 ... a pair of rollers, the other roller, 3 ... a pair of rollers, one roller, M ... _{place, P 1, P 2, P} 3, P 4, P 5, P 6, P 7, P ₈ , P ₉ , P ₁₀ ... Metal ring part, W ... Metal ring.

Claims (2)

A metal ring having a circular arc shape whose central portion is convex outward in the cross-sectional view in the width direction on the outer peripheral surface, and a circular arc shape whose central portion is convex outward in the cross-sectional view in the width direction on the outer peripheral surface A tension is applied to the metal ring by moving at least one roller away from the other roller, and the distance between the two rollers is measured. In the metal ring circumference measurement method for calculating the circumference of the metal ring from
After calculating the circumference of the metal ring when one part of the metal ring is at a predetermined position between both rollers,
When the other part of the metal ring is at the predetermined position, the process of calculating the circumference of the metal ring is performed at least once,
A method for measuring the circumference of a metal ring, characterized in that an average value of the circumferences of all the calculated metal rings is used as the circumference of the metal ring.   The method for measuring the circumference of a metal ring according to claim 1, wherein the process of calculating the circumference of the metal ring is performed at least three times.