1、UDC 621.85.051.32 : 621.85.052.42 : 620.1 DEUTSCHE NORM March 1984 Power transmission elements Grooved pulleys for narrow V-belts Inspection of grooves DIN 221 1 Part 2 Antriebselemente; Schmalkeilriemenscheiben; Prfung der Fi ilien Supersedes July 1973 edition In keeping with current practice in st
2、andards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. The methods of measurement specified for the inspection of the groove angle and the datum diameter conform to International Standard IS0 255 - 1981 published by the
3、International Organization for Standardization (60) “Pulleys for classical and narrow V-belts; geometrical inspection of grooves“. Dimensions in mm 1 Field of application This standard specifies methods of inspecting the grooves of pulleys for narrow V-belts (hereinafter briefly referred to as pulle
4、ys) as specified in DIN 221 1 Part 1. 2 Designation Designation of method W for the determination of the groove angle a: Inspection DIN 221 1 - W 3 Inspection of groove angle a Measuring method W The groove angle a shall be inspected with the aid of a limit gauge conforming to figure 1 as illustrate
5、d in figure 2. See DIN 221 1 Part 1 for the values for the other limit gauges. - .- y L! im n amax 390 I Figure 1. Limit gauge for inspecting the groove angle: The limit gauges shall be marked for groove angle u = 38 in accordance with the example illustrated. t-i Figure 2. Inspection of groove angl
6、e: Illustrated by way of example on pulleys with groove angle a = 38“. Continued on page 2 Beuth Verlag GmbH. Berlin 30. has exclusive sale rights for German Standards (DIN-Normen) DIN 22 11 Part 2 Engl. Price group 5 Sales No. 0105 12.84 Page 2 DIN 221 1 Part 2 4 Inspection of datum diameter d, Onc
7、e the distance K of the external tangential plane parallel to the axis of the pulley has been measured, the datum diam- eter d, may be determined: d, = K - 2 ht. If a pulley contains several grooves, each groove shall be inspected separately. The test rollers shall be marked according to the belt cr
8、oss sections. Standards referred to DIN 221 1 Part 1 Power transmission elements; grooved pulleys for narrow V-belts; dimensions, material DIN 2215 Endless classical V-belts; dimensions DIN 2216 Cut classical V-belts; dimensions DIN 2269 Test rollers DIN 7753 Part 1 Endless narrow V-belts for mechan
9、ical engineering; dimensions Previous editions DIN 221 1 Part 2: 06.67,07.73 Amendments The following amendments have been made in comparison with the July 1973 edition: a) the content of the standard has been restructured; b) the reference to IS0 255 has been corrected; c) the designation clause ha
10、s been included; d) the term “working diameter“ has been amended to “datum diameter“ and “working width“ has been amended to e) the test rollers conforming to DIN 2269 have been introduced for measuring method B in place of measuring cylinders; f) symbol k has been amended to K, x has been amended to ht and d has been amended to d,. “datum width“; International Patent Classification F 16 H 55-49
