1、January 1988 UDC 621.85.052.42 : 621.9 DEUTSCHE NORM Endless narrow V-belts for mechanical engineering purposes Dimensions I 7753 Pari 1 Endlose Schmalkeilriemen fur den Maschinenbau; Mae Supersedes October 1977 edition. In keeping with current practice in standards published by the International Or
2、ganization for Standardization (ISO), a comma has been used throughout as the decimal marker. See Explanatory notes for connection with International Standard IS0 4184 - 1980 published by the International Organization for Standardization (ISO). Dimensions in mm 1 Scope and field of application This
3、 standard specifies the characteristics of endless narrow V-belts, abbreviated below to belts, for mechanical engineering purposes. 2 Terminology 2.1 Pitch width of belt, b, The pitch width of a belt, b, is understood to be the width of the belt at its pitch zone (neutral zone). The width remains th
4、e same when the belt is bent perpendicularly to its base (from: DIN 7719 Part 1, October 1985 edition). 2.2 Datum length of belt, L, The datum length of a belt, L, is understood to be the length of the belt at the level of the datum diameter of the measuring pulleys whilst the V-belt is at a prescri
5、bed tension (from: DIN 7719 Part 1). Continued on pages 2 to 5 Beuth Verlag GmbH. Berlin. has the exclusive right of sale for German Standards (DIN-Normen). DIN 7753 Part 1 Engl. Price group 09.88 Sales No. O106 I Page 2 DIN 7753 Part 1 Belt section Top width Pitch width, =z symbol of belt, bo bw 3
6、Dimensions and designation The belt profile is not expected to conform to the design illustrated here; compliance is only required in the case of the dimensions specified. The angle of the belt has not been specified, Datum diameter of the h associated pulleys, as in Height of belt, smallest permiss
7、ible DIN 2211 Part 1 4 min. 7 XPZ SPA XPA SPB Figure I. Belt profile 9.7 8.5 8 50 12,7 11 10 90 12.7 11 9 63 16,3 14 13 140 Designation of a narrow V-belt, belt section XPZ, with a datum length,l, of 710 mm: s PC XPC Narrow V-belt DIN 7753 - XPZ 710 22 19 18 224 22 19 18 160 Table 1, Belt dimensions
8、 Wrapped Raw edged, notchedl) Wrapped Raw edged, notched) Wrapped Raw edged, notched) Wrapped Raw edged, notched 1 ) 100 l3 I 1) Raw edged belts may also be installed where up till now wrapped belts have been required. 1 DIN 7753 Part 1 Page 3 Table 2. Belt lengths and belt matching tolerances for b
9、elts of the same set Belt type Datum length,L, 2 500 k 25 Permissible difference between the datum lengths of the belts of one and the same set in the case of multi-belt drives Page 4 DIN 7753 Part 1 4 Material, design and finish The material of the belt, its design and finish shall be at the discre
10、tion of the manufacturer unless otherwise agreed, 5 Marking The belts shall be marked on their reverse side with at least t.he symbol denoting the belt section, and the datum length, e.9. with SPZ 900. Agreement shall be made regarding any further marking. F a Figure 2. Measuring arrangement Figure
11、3. Groove profile of measuring pulley Table 3. Dimensions of measuring pulleys and measuring pin, and measuring force Belt section symbol applied to measuring pins, K k 0.05 1) The stress applied to each side of the belt is equal to half the values given. DIN 7753 Part 1 Page 5 6 Measuring the datum
12、 length To determine the datum length of the belt, it shall be set up on two steel measuring pulleys of the same size as shown in figure 2, with groove shape as specified in figure 3 and dimensions as in table 3. The measuring force shall be applied to the movable pulley. To ensure that the belt is
13、well-seated in the pulley grooves and that the measuring force is equally distributed on both sides of the belt, turn the pulleys, with the measuring force applied, until the belt has completed at least two revolutions. Then measure the distance between the axes, a. L, is obtained from twice the axi
14、al distance plus the datum circumference of the measuring pulley, U, using the equation: L, = 2a + U,. Standards referred to DIN 221 1 Part 1 DIN 2269 Measuring pins DIN 7719 Part 1 Power transmission elements; grooved pulleys for narrow V-belts; dimensions, materials Endless wide V-belts for indust
15、rial speed transformers; V-belts and associated pulley groove profiles Other relevant standard DIN 7753 Part 2 Endless narrow V-belts for mechanical engineering purposes; calculation of drives, power ratings Previous editions DIN 7753: 04.59; DIN 7753 Part 1: 03.67, 10.77. Amendments The following a
16、mendments have been made to the October 1977 edition. a) Type 19 belt section has been deleted. b) Raw edged, notched V-belts have been included for the first time. c) Verification of measuring pulleys by means of measuring pins has been included for the first time. d) The nomenclature has been amen
17、ded. e) The standard designation has been amended. Explanatory notes The belt profiles and lengths listed in this standard for encased belts correspond to those specified in the International Standard, IS0 4184 - 1980, Classical and narrow V-belts; lengths. Type 19 belt sections listed in the previo
18、us edition have been deleted as there are no standardized pulleys listed for this section in the relevant pulley standard. The nomenclature has been aligned with that used in IS0 1081 - 1980, Drives using V-belts and grooved pulleys; termi- nology. The same procedure for verifying the measuring pulleys has been adopted as provided in the relevant pulley standard, DIN 221 1 Part 1, which specifies the verification of pulleys verifying measuring pins as specified in DIN 2269. International Patent Classification F 16G 5/00
