1、日本汽车标准_JASO E109-1994 英文版 汽车多楔带_JAPANESE AUTOMOBILE STANDARD JASO E 109-94 Automotive V-ribbed belts 1. Scope This standard specifies the V-ribbed belts (here- inafter referred to as belts) for driving the cooling fans, alternators, water pumps, com- pressors, power steering pumps, super char- gers,
2、 etc. of automobile internal combustion engines. Remarks : The applicable standards to this standard are as follows. JIS 6 0601 JIS Z 8401 JASO E 110 JASO E 111 Definitions and designation of sur- face roughness Rules for rounding off of numerical values Test method for toothed belts for automobiles
3、 Shape and dimension of V-ribbed pulley grooves for automobiles 2. Definitions Definitions of main terms used in this standard are as follows. (1) Effective length The length of a line circumscribing a belt through the effective circumference of a measuring pulley when the belt is placed onto two me
4、asuring pulleys with a specified force applied. Belt break down (2) Pitch zone A zone in a belt where any extension and retraction are not present when it is bent. It is used to calculate the speed ratio of the pulley. A state of a belt in which the belt is placed with its rib section faced inward.
5、A state of a belt in which the belt is placed with its rib section faced outward. (3) Normal bending (4) Reverse bending 3. Classification The belt is of PK type only. 4. Quality 4.1 Performance To test the performance of the belt, a test com- prising normal bending only (The test conditions are lis
6、ted in AI) or a test including reverse bending (The test conditions are listed in 61) as indicated in paragraph 9.2 shall be selected according to the pulley layout in which the belt is used. As the result of the test, any damages as shown in Fig. 1 must not be produced, and the second re-tensioning
7、 must not be required. Fig. 1 Rib rubber chunk (at one or more place) Rib rubber crack (Crack reached to tension member) 4.2 Tensile characteristics 9.3, and the tensile strength and elongation The test of the belt for tensile characteristics shall be carried out on the method in paragraph must meet
8、 the requirements in Table 1. 1 JASO E 109-94 Number of rids 3 4 5 6 7 or over Tensile characteristics Tensile strength Elongation Max. tensile force % Force at measurement kN kN 2.40 or over 3.0 or 0.75 3.20 or over below 1 .o0 4.00 or over 1.25 4.80 or over 1.50 0.80 x n() or over 0.25 x n 4.3 Low
9、 temperature resistance The test of the belt for low temperature re- sistance shall be carried out on the method in paragraph 9.4, and any crack must not be developed. Effective diameter 4.4 Pitch zone height and ride out The pitch zone height and ride out of the belt are indicated by the heights b,
10、 and bo protruded Normal bending pulley 55 Reverse bending pulley - outward from the effective diameter d. of the pulley as shown in Fig, 2, respectively. The ride out is measured by the method in subpara- graph 9.1.3. The reference vaues and toier- ances of pitch zone height and ride out, and the p
11、itch zone height measuring method shall be determined in accordance with the mutual agreement between the manufacturer and the user. Fig.2 Pitch zone height and ride out Where b, : Pitch zone height (mm) bo : Ride out (mm) de : Pulley effective diameter (mm) 4.5 Minimum pulley diameter recommended p
12、ulley diameters are listed in For minimum pulley diameters, the minimum Table 2 for the durability of the belf. 85 Outer diameter - 5. Construction The belt must be endless with the construction as shown in Fig. 3. The construction with three ribs is shown in Fig. 3 as an example. 2 JAS0 E 109-94 Ra
13、dius at groove bottom Belt width Fia. 3 Construction r Max. 0.25 b 13.56 x n() O I Adhesive rubber Rib height I Rib rubber h, I 2 to 3 (Reference) 6. Nominal dimensions 6.1 Nominal dimensions of belt cross sec- tions The nominal dimensions of belt cross sections are listed in Table 3. Over 1500 to a
14、nd incl. 2000 Over 2000 to and incl. 2500 Table 3 Belt Cross Sections f 9.0 k 10.0 Table 3 Belt Cross Sections Unit : mm Items Nominal dimension Name Rib Ditch Rib anale I a I4o( Belt thickness I h 14.5 to 6 (Reference Nominal value of effective length I Tolerance UP through 1000 I k 5.0 Over 1 O00
15、to and incl. 1200 f 6.0 Over 1200 to and incl. 1500 I f 8.0 Over 2500 to and incl. 3000 I f 11.0 Remark : The tolerances of effective lengths exceeding 3000 mm shall be determined in accordance with the mutual agree- ment between the manufacturer and the user. 3 JACO E .lo984 7. Appearance The belt
16、must be free from any visible harmful twisting, distortion, flaws, pin holes, foreign matter, etc. 8. Materials 8.1 Rubber The adhesive rubber and rib rubber shall be uniform in composition. 8.2 Backside The back side shall be made of cotton, synthetic plain weave fabric, or these mixed fabric, and
17、shall be free from harmful flaws, distortion, etc. The density of its warp and weft shall be uni- form. 8.3 Tension member The tension member shall be made of synthetic fiber cords, etc., and its twist shall be uniform. 9. Test procedure 9.1 Measurement of effective belt length and ride aut 9.1.1 Me
18、asuring fixture The measuring fixture is composed of two rotat- able pulleys with groove cross section dimen- sions as shown in Table 5. One of the pulleys is fixed in position, and the other one is movable while a specified force is applied in forcing direction. The conceptual drawing of the fixtur
19、e is shown in Fig. 4. 9.1.2 Measurement of effective belt length To determine the effective belt length Le, place the belt onto the measuring fixture in subpara- graph 9.1.1, with 100 x n() N measuring force applied, and rotate the belt at least two revolu- tions. Then measure the center distance be
20、- tween the pulley shafts and calculate the effec- tive length, Le, of the belt using the following formula. Le = E, + Ern, + U, Where i, : Effective belt length E, : Maximum centre distance E, : Minimum centre distance U, : Effective circumference of measuring pulleys NOTE () : For force, the measu
21、ring force is applied with a weight calibrated by Japanese Weight and Measure Act, hydraulic pres- sure, or the equivalent method. Fig. 4 Effective Length Measuring Fixture Measuring force Table 5 Groove Dimensions and Tolerances of Measuring Pulley Grooves 4 JAS0 f 1 09-94 Checking ball or rod diam
22、eter Diameter over balls or rods Table 5 Groove Dimensions and Tolerances of Measuring Pulley Grooves Unit : mrn Groove pitch f 0.05() Groove angle ?z 0.25() Effective diameter 95.5 t% 2.50 k 0.01 da 96.49 * 0.13 Radius at groove tip 1 r I Radius at groove bottom i ;e I y;. 0.5 Effective circumferen
23、ce of measuring pulleys Note() : Even if the number of grooves is eight or over, the cumulative pitch error of the dimension S, shown in Fig. 5. Then calcu- late the ride out bo, of the belt using the following formula. I 1 any adjacent two grooves must be within f 0.3rnm. 9.1.3 Measurement of ride
24、out To determine the ride out, bo, of a belt, take the same procedure as in measurement of effeciive belt length in subparagraph 9.1.2 and measure Fig. 5 s b, = S - de I j i i Where b, : Ride out (mm) de : Pulley effective diameter (mm) -_-_-_- 9.2 Dynamic test 9.2.1 Test belts As test belts, the nu
25、mber of ribs and the effec- tive length are shown in Table 6. 9.2.2 Test equipment The test equipment shall consist of pulley layout shown in Fig. 6. It is composed of the pulleys shown in Table 7 and the heat chamber sur- rounding the drive, and is driven by an electric motor. The ambient temperatu
26、re in the chamber shall be controlled. 9.2.3 Test procedure For the test, first the belt shall be installed on the test equipment with its rib section faced inward, and with the tensioning force shown in Fig. 6 applied, and the belt is rotated manually two to three turns with the tensioning pulley s
27、haft set in movable condition before the shaft is fixed. Then the rotational speeds of the drive and driven pulleys are measured at no load, and the test is started at the ambient temperature of 85 2 5 OC under the conditions shown in Fig. 6. If the slip ratio reaches 4 % , the test shall be stopped
28、 and the equipment and belt shall be allowed to cool to a temperature of 15 to 35 OC . Then the belt is re-tensioned in the same condi- tions as stated above, and the test is re-started. The slip ratio is calculated by the following for- mula. g=- /lf x 100 I* N, I, =- N ,o N, If = - Nlf 5 JACO-E 10
29、9-94 Nnmber of ribs Where g : Nio : Belt length range rnrn Slip ratio ( % ) Initial rotational fre- quency of driving Test condition Al Test condition 61 N, : Final rotational fre- quency of driven pulley (r/min) 3 850-1 O00 3 1050-1 300 Remarks : pulley (rlmin) I. In case of testing with new pulley
30、s, the pulleys quency of driven shall be run with a belt (not for test) for at least pulley (!-/min) 48 hours under the conditions shown in Fig. 6 quency of driving 2. The mis-alignment between the pulleys shall be pulley (r/min) at most 113 degree. Nm : Initial rotational fre- Nit : Final rotationa
31、l fre- before the test is started. Driving pulley speed r/rnin 4800 k 100 Load Tensioning force Test time kW N h 8 680 * 30 50 Tensioning pulley Belt tensioning force to tensioning pulley Rotational direction Test condition BI L Driven Dullev applied 1 Tensioning pulley Belt tensioning force T- to t
32、ensioning puiiev - Reverse bending idler pulley Rotational direction applied 6 JASO E 109-94 Symbol e a, do (1 de d, dm Table 7 Groove Dimonsions of Dynamic Test Pulleys 5F-Y Driving & driven Tensioning pulley Reverse bending pulley idler pulley - 3.56 k 0.05 3.56 i 0.05 40 t_ 1 (O) 40 & 1 (O) - - 1
33、20.0 55.0 - 80.0 X 0.1 - - 2.50 k 0.01 2.50 f 0.01 120.99 I 0.25 55.99 f 0.25 - Table 7 Groove Dimensions of Dynamic Test Pulleys ; I 0.25*:18 Max. 0.50 0.25+:8 - Max. 0.50 - 9.3 Tensile test 9.3.1 Specimen As specimens, three test pieces of at least 250 mm long are cut off from one belt, and a benc
34、h mark of 100 mm apart for measurement of elongation is drawn on the center of them. If three test pieces cannot be sampled from one product, the number of samples shall be deter- mined in accordance with the agreement be- tween the manufacturer and the user. 9.3.2 Test procedure The test shall be c
35、arried out by the tensile tester at the ambient temperature of 25 +- 5 OC and the test speed shall be 50 t 5 mm/min. To determine elongation, measure the bench mark distance when the force shown in Table 1 in paragraph 4.2 applied, and calculate the percentage elongation. The tensile strength is the
36、 maximum tensile force at which the test piece breaks. In general, the standard measured value is determined by averaging the three measure- ments and rounding off to two decimals in accor- dance with JIS io 8401. The measured values for the test piece broken at the gripped section must be excluded.
37、 In this case, another test pieces shall be sampled from the same product and the test shall be carried out for compensation of the measured values. 9.4 Low temperature test 9.4.1 Specimen As specimens, some test pieces are sampled from a product in the same manner as in para- graph 9.3, and pre-tre
38、ated for 70; hours at the ambient temperature of 100 k 2C . 7 JAS0 E 109-94 Conditions Temperature in test room OC 9.4.2 Test procedure The specimen is taken out after being soaked for 70; hours at the ambient temperature of - 30 ? 1 C . Then it is bent immediately to the con- tact angle of at least
39、 90 O around the cylinder under the bending conditions as shown in Table 8 to check for the existence of cracks. For the test, either the test conditions A2 or 82 is selected according to the pulley layout in which the belt is used. Test condition A2 25 k 5 Test condition i32 25 5 5 Tabiel Bending C
40、onditions Diameter of cylinder mm t 40 I 70 Bending direction of belt I Normal bending 1 Reverse bending 10. Designation of belts The belts are designated in the order of name, Example : SN, tumber Leit profile number of belt ribs, belt profile, and effective length (mm). V-ribbed belt PK Effective
41、length of belt ribs 11. Indication The following items shall be indicated on the belt back. The items other than those indicated be- low may be used in mutual agreement between the manufacturer and the user. (1) Number of belt ribs, belt profile, and effec- (2) Name of manufacturer or its abbreviati
42、on (3) Date of manufacture or its abbreviation tive length Related Standard : IS0 9981 Belt drives - Pulleys and V-ribbed belts for automotive industry - Dimensions - PK profile a JASO E 109-94 Explanatory note on JASO E 109-94 Automotive V-ribbed belts This explanatory note explains the items spec:
43、- fied in the main body and their related items, arid is not a part of the standards. 1. Purpose The purpose of this standards is to standardize automotive V-ribbed belts and maintain the proper quality of them. 2. Object The primary object of this revision is listed as follows. (1) The actual use c
44、ondition in Japan is re- viewed, and the standards are conformed to IS0 9981. (2) The dynamic test items corresponding to increase in the number of pulley layouts including reverse bending are specified. The dynamic test method is made basically in accordance with DIS 11749. (3) The groove forms of
45、V-ribbed pulleys and their tolerances which are described for reference in the explanatory noteof lhe existing standards are deleted after JASO E 11 1-93 has been established. (4) The form, terminology, and symbols used in the standards are changed to those that can be judged appropriate at the pres
46、ent. 3. Major review points The following points were reviewed in the meet- ing for revision. (1) Though only life time is specified as dura- bility in the existing standards, it was re- viewed this time, and the item name was changed to performance and the content was also changed. (2) The durabili
47、ty test is made in the test condi- tions specified in DIS 11749 because these conditions are similar to those used in Ja- pan. (3) The minimum pulley diameter was specified because it is necessary for drive design. Since the limitation of the minimum pulley diameter depends on load conditions, pulle
48、y layout, etc., however, a value that cari be accepted generally to a large extent was studied and specified as the minimum rec- ommended effective diameter. (4)Though there was an opinion that the belt profiles for normal and reverse bending could be specified according to the thick- ness (total th
49、ickness) of belt, it was judged that they could not be specified according to the total thickness only because the charac- teristics of rubber itself affects largely on tbe performance, it was judged that they could not specified by the total thickness only and this opinion was not adopted. (5) To cope with the requirements for the nar- rower tolerance in belt length, the accuracy of the existing belt in length was reviewed and, in the range of belt length where the belt length was longer, the tolerance was reviewed to be narrower
