1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 9980:2012 Belt drives Grooved pulleys for V-belts (system based on effective width) Geometrical inspection of groovesBS ISO 9980:2012 BRITISH STANDARD National foreword
2、 This British Standard is the UK implementation of ISO 9980:2012. The UK participation in its preparation was entrusted to Technical Committee MCE/10, Belts inspection of groove spacing (see Clause 4); inspection of effective diameter (see Clause 5); inspection of run-out (see Clause 6). 3 Groove pr
3、ofile 3.1 Specifications The groove profile shall be specified in the corresponding International Standard by the dimensions shown in Figure 1 and given in Table 1. NOTE The flanks of the grooves are straight up to at least d e 2 d h 2 . F i g u r e 1 G r o o v e p r o fi l e INTERNATIONAL STANDARD
4、ISO 9980:2012(E) ISO 2012 All rights reserved 1BS ISO 9980:2012ISO 9980:2012(E) T a b l e 1 G r o o v e p r o fi l e s p e c i fi c a t i o n s Dimension Symbol Tolerance Effective width w e A specified value not subject to tolerance Groove angle Groove depth h g Minimum value Sidewall bevel depth d
5、h 2 Maximum value Groove land height dh 1 a Maximum value aOnly for grooved pulleys for use with joined V-belts. 3.2 Inspection 3.2.1 Limit gauges The groove profile shall be checked using a limit gauge shown diagrammatically in Figure 2 or Figure 7. A gauge for each of the standard angles applicabl
6、e to each groove section in the corresponding International Standard is required. The limit gauges shall be marked with the groove section and the groove angle. 3.2.2 Inspection of grooves for single V-belts The limit gauge is shown in Figure 2. The minend of the limit gauge is used to check the min
7、imum value of the groove angle. The gauge shall come into contact with the groove at the lower corners (see Figure 3) or be in contact uniformly along the sidewalls. The maxend of the limit gauge is used to check the maximum value of the groove angle, the effective width, the groove depth and the si
8、dewall bevel depth, dh 2 , in the same operation. The groove angle, the effective width, the groove depth and the sidewall bevel depth, dh 2 , comply with specifications if the corners of the gauge at width, w 1 , contact the straight sidewalls of the groove (see Figure 4). The groove angle is too g
9、reat if only the lower corners of the maxend of the gauge are in contact with the groove. The effective width is too small or the sidewall bevel depth, dh 2 , too great if the top corners of the gauge at width, w 1 , lie above the straight sidewalls of the groove (see Figure 5). The groove depth is
10、too small if the gauge touches the bottom of the groove (see Figure 6). 3.2.3 Inspection of grooves for joined V-belts The limits gauge is shown in Figure 7. The minend of the limit gauge is used to check the minimum value of the groove angle. The gauge shall come into contact with the groove angle.
11、 The gauge shall come into contact with the groove at the lower corners (see Figure 3) or uniformly along the sidewalls. The maxend of the limit gauge is used to check the maximum value of the groove angle, the effective width, the groove depth, the sidewall bevel depth, dh 2 , and the groove land h
12、eight, dh 1 , in the same operation. The groove angle, the effective width, the groove land height, the sidewall bevel depth and the groove depth comply with specifications if the corners of the gauge at width, w 1 , come into contact with the straight sidewalls of the groove (see Figure 8). The gro
13、ove angle is too great it only the lower corner of the maxend of the gauge comes into contact with the groove. The groove land height, dh 1 , is too great if the shoulder of the gauge comes into contact with the groove land without the gauge being seated firmly in the groove (see Figure 9). 2 ISO 20
14、12 All rights reservedBS ISO 9980:2012ISO 9980:2012(E) The effective width is too small or the sidewall bevel depth, dh 2 , too great if the top corners of the gauge at width, w 1 , lie above the straight sidewalls of the groove (see Figure 10). The groove depth is too small if the gauge touches the
15、 bottom of the groove (see Figure 6). The dimensions are: w 1= w e 2 dh 2 tan /2 h 1= h g dh 2 h 2 h 1 Figure 2 Limit gauge for single V-grooved pulleys Figure 3 Fitting of limit gauge in the groove to be checked (good) F i g u r e 4 I n s p e c t i o n o f g r o o v e p r o fi l e ( g o o d ) ISO 2
16、012 All rights reserved 3BS ISO 9980:2012ISO 9980:2012(E) F i g u r e 5 I n s p e c t i o n o f g r o o v e p r o fi l e ( b a d ) F i g u r e 6 I n s p e c t i o n o f g r o o v e p r o fi l e ( b a d ) The dimensions are: w 1= w e 2 dh 2 tan /2 w 2 e (see 4.1.1) h 1= h g dh 2 h 3= dh 1+ dh 2 Figur
17、e 7 Limit gauge for multiple V-grooved pulleys 4 ISO 2012 All rights reservedBS ISO 9980:2012ISO 9980:2012(E) F i g u r e 8 I n s p e c t i o n o f g r o o v e p r o fi l e ( g o o d ) F i g u r e 9 I n s p e c t i o n o f g r o o v e p r o fi l e ( b a d ) F i g u r e 1 0 I n s p e c t i o n o f g
18、r o o v e p r o fi l e ( b a d ) 4 Groove spacing 4.1 Specifications 4.1.1 Groove spacings The following dimensions shall be specified in the corresponding International Standard for multiple groove pulleys (see Figure 11): the distance between the axes of two consecutive grooves: nominal value, e;
19、the permissible tolerance on the nominal value, e; ISO 2012 All rights reserved 5BS ISO 9980:2012ISO 9980:2012(E) for grooved pulleys for use with joined V-belts, a maximum value for the sum of all deviations from the nominal value, e, for all grooves in any one pulley. Figure 11 Multiple groove pul
20、ley 4.1.2 Distance between edge of pulley and first group centre A minimum value shall be specified for the distance, f, between the outside of the rim and the axis of the first groove for all single and multiple groove pulleys. A plus and minus tolerance may be assigned to the value of f in order t
21、o facilitate the alignment of the pulleys. 4.2 Inspection Measure pulley groove spacing using a sheave groove tool and sets of interchangeable balls for each individual groove section. The ball diameter shall be as specified in 5.1.2. Measure the groove spacing e, using the groove spacing locator as
22、 shown in Figure 12. The movable ball slide shall be tightened after the balls have been properly placed in the grooves. Measure the distance, x, using a Vernier micrometer caliper. The measured groove spacing, e, is equal to the measured dimension, x, minus the diameter of the inspection ball used.
23、 Figure 12 Groove spacing locator 6 ISO 2012 All rights reservedBS ISO 9980:2012ISO 9980:2012(E) 5 Effective diameter 5.1 Specifications 5.1.1 Effective diameter The following dimensions shall be specified in the corresponding International Standard: the effective diameter: nominal value, d e ; the
24、permissible tolerance on the nominal value, d e ; for multiple groove pulleys, the permissible variation of the effective diameters measured from groove to groove. NOTE Knowledge of the deviations in effective diameters between the grooves of a single service pulley is more important than that of th
25、e exact value of the effective diameters. 5.1.2 Checking balls or rods The following dimensions shall be specified in the corresponding International Standard: the diameter of balls or rods, d; the permissible tolerance on d; the corrective term 2h s . The corrective term, 2h s , is calculated using
26、 Formula (1): (1) where w eis the effective width; is the groove angle; d is the diameter of balls or rods. The corrective term, 2h s , may be rounded off in an appropriate way see Formula (1). 5.2 Inspection Use two cylindrical balls or rods of diameter, d, in accordance with 5.1.2. Place these two
27、 balls or rods in the groove to be checked (see Figure 13). Measure the distance, K, between the planes which are externally tangent to the balls or rods and parallel to the axis of the pulley. This distance may be measured using a plane and parallel assay instrument, for example a Vernier caliper.
28、The effective diameter, d e , of the groove is then given by the relationship in Formula (2): (2) where 2h sis the corrective term given in 5.1.2. ISO 2012 All rights reserved 7BS ISO 9980:2012ISO 9980:2012(E) Figure 13 Fitting of rods in the groove to be checked 6 Run-out tolerances 6.1 Specificati
29、ons The following dimensions shall be specified in the corresponding International Standard (see Figure 14): the radial circular run-out tolerance, t 1 , of the outside diameter. The datum A is the axis of the bore; the axial circular run-out tolerance, t 2 , measured perpendicular to the groove sid
30、ewall at level a. The common datum is formed by the datum A of the axis of the bore and the datum B of the grooved pulley face fitted to the collar of the shaft; the distance, a, between the measurement position and the effective diameter, d e . 6.2 Inspection The radial and axial run-outs shall not
31、 be greater than the values specified at the measurement position (see Figure 14) during one revolution about the datum axis A. NOTE Radial and axial circular run-out tolerances are represented according to ISO 1101. Figure 14 Radial and axial circular run-out tolerances 8 ISO 2012 All rights reserv
32、edBS ISO 9980:2012ISO 9980:2012(E) Bibliography 1 ISO 1081, Belt drives V-belts and V-ribbed belts, and corresponding grooved pulleys Vocabulary 2 ISO 1101, Geometrical product specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-out 3 ISO 2790, Belt drives
33、V-belts for the automotive industry and corresponding pulleys Dimensions 4 ISO 5290, Belt drives Grooved pulleys for joined narrow V-belts Groove sections 9N/J, 15N/J and 25N/J (effective system) 5 ISO 5291, Belt drives Grooved pulleys for joined classical V-belts Groove sections AJ, BJ, CJ and DJ (effective system) ISO 2012 All rights reserved 9
