ISO-255-1990.pdf
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1、INTERNATIONAL STANDARD IS0 255 Second edition 1990-11-01 Belt drives - Pulleys for V-belts (system based on datum width) - Geometrical inspection of grooves Transmissions par courroies - Poulies B gorges pour courroies trapkoidales (systeme base sur la largeur de r - inspection of groove spacing (se
2、e clause 5); - inspection of datum diameter (see clause 6); - inspection of run-out (see clause 7). 4 Groove profile 4.1 Specification The groove profile shall be specified in the corre- sponding International Standard by the dimensions shown in figure 1 and given in table 1. -u : I Figure 1 - Groov
3、e profile Dimension Table 1 - Groove profile specification Symbol Tolerance Datum width Groove angle Groove height above datum width Groove depth below datum width wd A specified value not subject to toler- ance - the permissible tolerance on the nominal value (! for the distance between any two gro
4、oves of a single pulley. Figure 7 - Multiple groove pulley 51.2 Distance between edge of pulley and first group centre A minimum value shall be specified for the distance fbetween the outside of the rim and the axis of the first groove for all single- and multiple-groove pul- leys. A plus and minus
5、tolerance may be assigned to the value of fin order to facilitate the alignment of the pulleys. 5.2 inspection Measure pulley groove spacing using a pulley groove tool and sets of interchangeable balls fol each individual groove section. The bail diameter shall be as specified in 6.1.2. Measure the
6、groove spacing e, using the groove spacing locator which consists of a vernier gauge incorporating sets of interchangeable balls for each individual groove section (see figure8); the bail di- ameters are given in tableA.1. The movable ball slide shall be tightened after the bails have been properly
7、placed in the grooves. Measure the dis- tance x using a vernier caliper or micrometer. The 3 IS0 255:1990(E) Figure 8 - Groove spacing locator measured groove spacing, e, is equal to the meas- ured dimension, X, minus the diameter of the in- spection ball used. 6 Datum diameter 6.1 Specifications 6.
8、1.1 Datum dlameter The following dimensions shall be specified in the corresponding International Standard: - the datum diameter - nominal value dd; - the permissible tolerance on the nominal value 4; - for multiple-groove pulleys, the permissible vari- ation of the datum diameters measured in any t
9、wo grooves of a single pulley. 6.1,2 Checking balls or rods The following dimensions shall be specified in the corresponding International Standard: - the diameter of bails or rods, d; - the permissible tolerance on d; - the corrective term 2h,. The diameters d shall be determined so that the simult
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- ISO 255 1990
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