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1、I J I S B*9205 87 E 4933b08 0024863 9 E UDC 629.1 14.2.021.5 : 631.37 JIS JAPANESE INDUSTRIAL STANDARD Tires for Agricultural Implements and Machineries Translated and Published by Japanese Standards Association Printed in Japan 4s In the event of any doubt arising, the original Standard in Japanese
2、 is to be final authority. J I S B*205 87 0 4933608 0024863 2 m UDC 629.114.2.012.5 : 631.37 JAPANESE INDUSTRIAL STANDARD J I S Tires for Agricultural Implements and Machineries B 9205-1987 1. Scoue This Japanese Industrial Standard specifies the tires for agricultural machinery, hereinafter referre
3、d to as “tires”. Remark: The units and numerical values shown in the traditional units and are currently the criteria in force. in this Standard are based on 2. Definitions For the main terms used in this Standard the definitions in JIS D 4201, JIS D 4202, JIS D 4230 and JIS D 6200 apply, and the re
4、st of the terms shall be as follows: side wall part cords (or metallic wires). breaker carcass, for the purpose of protecting the carcass of bias-ply tires and reaches only halfway to the bead. The outer wall between the tread and bead. Those fibers which have been twisted to form plies inside the t
5、ires A layer of cords which are inserted mostly between the tread and the belt tires, but reaches only halfway to the bead part, and functions as a hoop effect. bead part bundle of steel wires with plies. A layer of cords which lies between the tread and the carcass of radial-ply A part which has be
6、en so fabricated as to fit the rim, enveloping the cord angle The angle formed between the cord and the centre line. 3. Types and Dimensions The types and dimensions of the tire shall be in accordance with JIS B 9202 or the standard prescribed by public organizations. 4, Materials and Manufacturing
7、Method 4.1 The tire shall be manufactured by vulcanization after having been formed to meet the service purposes with the materials of the compounded rubber, cord fabric, plain-weave fabric (1) and bead wire. Its composition shall, as shown in Figure, the roughly divided into the tread part, side wa
8、ll part, breaker (2) or belt part, carcass part and bead part, and they shall be bounded together completely and firmly. Notes (1) The cord fabric and plain-weave fabric shall include inorganic matters of steel and glass and others. (2) In some cases, breakers may be omitted. Applicable Standards, a
9、nd Reference Standard: See page 4. -,-,- J I S 8*9205 87 W 4933688 00248b4 4 Tread rubber 2 B 9205-1987 6.1 Tensile strength MPa (kgf/cm2 9.8 (100) min. Flongation % 300 min. Tension test Figure. Example of Section of Tire Tread part Breaker or belt part Carcass part Side wall part Bead part Tension
10、 test Peeling test Carcass 4.2 The cord fabric shall be processed with sufficient compounded rubber so that fabric plies adhere to each other firmly and at the same time the distinct rubber layers are formed between the fabric layers. 4.3 The bead part shall have a core of bead wires and the like an
11、d be held firmly between the fabric plies not to move. Tensile load (per 25 mm in width) N (kgf Peeling load (per 25 mm in width) N (kgf) 392 (40) min. 78 ( 8) min. 6.3 6.4 5. Qualities 5.1 Appearance The tire shall be uniform both in shape and wall thickness, and shall be free from defects injuriou
12、s to use such as flows, bubbles, cracking of rubber, ill flow of rubber, and mingling of foreign substances. 5.2 Performances The tire, when tested in accordance with the test mechod of 6.1 to 6.4, shall conform to the requirements of Table. Table. Performances Test item Applicable I Performance I s
13、ubclause I Aging test I Decreasing rate of tensile strength % I 15 max. I 6.2 6. Testing Methods 6.1 Tension Test of Tread Rubber Carry out the tension test of tread rubber in accordance with 3. of JIS K 6301, as appropriate, using No. 3 dumbbell-shaped test pieces, or No. 4 dumbell-shaped ones. Tak
14、e the test pieces of 0.5 mm or over up to and including 3.0 mm in thickness, from the tread part of the sample. In the test, measure 4 test pieces and employ the median value. a, -,-,- J I S B*205 87 4933638 00248b5 b 3 B 9205-1987 a P a 0 a 6.2 AginP Test on Tread Rubber Carry out the aging test on
15、 tread rubber in accordance with the method of 6.3 of JIS K 6301, as appropriate, taking 4 test pieces in the same way as 6.1. However, after the test pieces have been acceleration-aged for 96 h continuously at an aging temperature of 70 f 1 C or for 24 h at 90 f lo C, measure the tensile strength,
16、and calculate the decreasing rate of tensile strength as compared with before aging, from the following formula (1): (1) A, (TB) =- x o - XI x 100 r6 where A, (TB) : decreasing rate of tensile strength as compared with before aging (%) X, : X, : median value of tensile strength before aging MPa kgf/
17、cm2) median value of tensile strength after aging MPa kgf/cm2) 6.3 Tension Test of Carcass In the tension test of carcass, take as test pieces 10 pieces of cord randomly from the central layer of carcass beneath the centre of tread, measure the tensile loads of each cord with a single-thread tension
18、 tester, fabric tension tester or rubber tension tester, and calculate the tension load from the following formula (2), assuming the numerical value obtained by multiplying the mean value by the number of counts per 25 mm in the width of carcass layer beneath the centre of tread to be S, and the cor
19、d angle of central layer of carcass beneath the centre of tread to be a. However, the tension speed shall be in accordance with the requirements of 7.5 of JIS L 1017 or 6.4 of JIS G 3510. In addition, the grip distance shall be 100 to 250 mm. (2) . . L=- P s &Za PR where L : tensile load N kgf) P :
20、actual ply number PR : fly rating (3) S : (tensile load per single cord) X (count per 25 mm of carcass layer) (Y : cord angle Note (3) For the radial tire, the maximum PR of equivalent bias tire shall be applied. 6.4 Peeling Test For the peeling test, take a test piece in the direction of warps of t
21、he first layer from the sample so that it includes 2 layers of the central layers of the carcass and obtain the peeling load in accordance with the method of % of JIS K 6301. In this case, where it is difficult to carry out the peeling test between the carcasses, obtain the peeling load between the
22、belt and the carcass. 7. Designation of Tire specifications of JIS D 4201. The designation of the tire shall be in accordance with the -,-,- 4. B 9205-1987 8. Marking The tire shall be marked with the following information. (i) Designation of tire (2) Serial number (3) Manufacturer?s name or its abb
23、reviation e Applicable Standards: JIS B 9202-Dimensions and Load Ratings of Tires for Agricultural Machines and Implements JIS D 4201-Designation System of Tire, Tube, Rim Band, and Flap for Automobiles JIS D 4202-Dimensions of Tires for Automobiles JIS D 4230-Tires for Automobiles JIS G 3510-Testin
24、g Methods for Steel Tire Cords JIS K 6200-Glossary of Terms Used in Rubber Industry JIS K 6301-Physical Testing Methods for Vulcanized Rubber JIS L 1017-Testing Methods for Chemical Fibre Tire Cords Reference Standard: JIS Z 8203-SI Units and the Use of their Multiples and of Certain other Units a a
25、 a a t J I S BX285 87 m 4933608 0024867 T m B 9205-1987 Edition 1 Japanese Text Established by Minister of International Trade and Industry Date of Establishment: 1959-09-01 Date of Revision: 1987-12-01 Date of Public Notice of Official Gazette: 1987-12-02 Investigated by: Japanese Industrial Standards Committee Divisional Council on High Moleculars Technical Committee on Tires and Tubes This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo 107 Japan OJSA, 1988 Printed i n Tokyo by Hohbunsha Co., Ltd. -,-,-