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1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2006 08 17 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.13 & 4 1999 04 16 Revised Revised Added Type A & B B. Hennessey 1990 06 29 Released C10068389 B. Hennessey Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC
2、 Page 1 of 4 DRIVE BELT, TOOTHED, HYDROGENATED NITRILE WSD-M96D15-A1 RUBBER (HNBR), GLASS TENSION CORDS, EXTENDED LIFE, SINGLE FACING FABRIC 1. SCOPE The material defined by this specification is a toothed drive belt based on Hydrogenated Nitrile Rubber (HNBR) with a single layer of polyamide facing
3、 fabric and glass fiber tension cords. The belt is suitable for use where average service temperatures up to 110 C and peak service temperatures up to 135 C are experienced. The belt is oil and water resistant and remains flexible down to -40 C. 2. APPLICATION This specification was released origina
4、lly for materials used as toothed belts used to drive components such as camshaft, injector pump and/or auxiliary engine parts. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production M
5、aterials (WSS-M99P1111-A). 3.4 BELT CONSTRUCTION The belt shall consist of a Hydrogenated Nitrile Rubber (HNBR) compound molded to the required tooth profile, covered on the contact face by a single layer of woven polyamide 6 or 66 fabric. There shall be no more than one join in the fabric except on
6、 belts with lengths greater than 925 mm when two joins are permissible. The belt shall be reinforced by multifilament glass fiber tensioning cords in S and Z twist pairs. The pairs of cords shall be evenly spaced across the width of the belt. The cords shall be covered by a layer of rubber the same
7、as that used for the teeth. There shall be no ends or loops of tensioning cords protruding from the cut sides of the belt. 3.5 MATERIAL TESTING, Rubber The following tests shall be performed on finished belts and/or test specimens cut from them. The test specimens shall be die-cut from the finished
8、parts and buffed or slit to the required thickness where necessary. When not feasible, specimens cut from molded test slabs manufactured from the same material with an equivalent state of cure shall be used. The test specimens shall have the following dimensions: 150 x 150 mm, min x 2.0 +/- 0.2 mm 3
9、.6 ORIGINAL PROPERTIES 3.6.1 Hardness, International Type A 65 - 73 (ASTM D 1415) Type B 73 - 83 ENGINEERING MATERIAL SPECIFICATION WSD-M96D15-A1 Copyright 2006, Ford Global Technologies, LLC Page 2 of 4 3.6.2 Hardness, Durometer A Type A 63 - 71 (ISO 868/ASTM D 2240, instantaneous, Type B 71 - 81 p
10、lied-up specimens. Hand held durometers shall not be used) 3.6.3 Tensile Strength, min 18 MPa (ISO 37/ASTM D 412, Die C) 3.6.4 Elongation at Break, min 375% (Test according to para 3.6.3) 3.6.5 Modulus at 100% Elongation Type A 2.3 - 4.0 (Test according to para 3.6.3) Type B 3.5 5.5 3.6.6 Compressio
11、n Set, max 80% (ISO 815/ASTM D 395, Method B, except 25% compression, plied-up specimens, 70 h at 125 C) 3.7 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 110 +/- 2 C) 3.7.1 Hardness Change, max +20 3.7.2 Tensile Strength Change, max -20% 3.7.3 Elongation at Break Change, max -7
12、5% 3.8 HEAT AGED (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 168 h at 135 +/- 2 C) 3.8.1 Hardness Change, max +15 3.8.2 Tensile Strength Change, max -30% 3.8.3 Elongation at Break Change, max -75% 3.9 IMMERSION IN ASTM OIL No.1 (ISO 1817/ASTM D 471, 168 h at 135 +/- 2 C) 3.9.1 Hardness Change -5
13、to +8 3.9.2 Tensile Strength Change, max -30% 3.9.3 Elongation at Break Change, max -50% 3.9.4 Volume Change, max -15 to +5% 3.10 TENSION CORDS Glass fiber, multifilament spun with S twist and Z twist alternated. ENGINEERING MATERIAL SPECIFICATION WSD-M96D15-A1 Printed copies are uncontrolled Copyri
14、ght 2006, Ford Global Technologies, LLC Page 3 of 4 3.11 FACING FABRIC A single layer of woven polyamide 6 or 66 fabric. The facing fabric construction shall be such that the requirements of this Material Specification and any Engineering Component Specification relating to the toothed belt are met.
15、 3.12 FINISHED PART 3.12.1 Hardness, International (ASTM D 1415 Micro Method) Tooth 64 - 74 (Cut top of tooth horizontally to leave a flat rubber surface for measurement of hardness) Back 64 - 74 3.12.2 Breaking Load Test Method: Tests to be conducted on complete belts by pulling at 25 mm/minute bet
16、ween two 114 mm cylinders mounted with teeth facing outwards. One of the cylinders shall turn freely to equalize stress in the belt. The belt width shall be as stated on the Engineering Drawing. Original, min 20 kN/20 mm width Heat Aged, min 20 kN/20 mm (Test Method per 3.7) width Heat Aged, min 20
17、kN/20 mm (Test Method per 3.8) width After Immersion in ASTM Oil No. 1, min 20 kN/20 mm (Test Method per 3.9) width After Immersion in 5% Sodium Chloride 16 kN/20 mm Solution, min width (168 h at 60 +/- 2 C) 3.12.3 Face Fabric Adhesion to Rubber Test Method: The face fabric shall be separated from t
18、he rubber at 50 mm/minute on a tensile testing machine giving a continuous autographic load record. From the load record calculate the mean minimum peak force in the valley section of at least 6 consecutive teeth. In some cases it may be found that the fabric breaks instead of peeling from the rubbe
19、r. This shall be noted in the results and be deemed acceptable providing the value at which breakage occurs exceeds the specified land section requirement. Original, min Valley 20 N/cm Heat Aged, min Valley 15 N/cm (Test Method per para 3.7) -,-,- ENGINEERING MATERIAL SPECIFICATION WSD-M96D15-A1 Pri
20、nted copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 4 of 4 Heat Aged, min Valley 12 N/cm (Test Method per para 3.8) After Immersion in ASTM Oil No. 1, min Valley 15 N/cm (Test Method per para 3.9) 3.12.4 Heat Aged No cracks (Test Method per para 3.7) Test Method: After ag
21、ing the belt shall be bent around a 25 mm diameter mandrel, the teeth facing inwards and outwards respectively (separate samples required). 3.12.5 Ozone Resistance, max Rating 0 (FLTM BP 101-01, belt to be bent around a 50 mm diameter mandrel with the teeth facing inwards) 3.12.6 Low Temperature Fle
22、xibility (48 h at -40 +/- 2 C) Test Method: After conditioning, the belt shall be bent within 1 second around a temperature conditioned 25 mm diameter mandrel. Separate samples of belt shall be tested with the teeth facing inwards and outwards respectively. The belts shall be examined at 2X magnific
23、ation. Original No Cracks Heat Aged per para 3.7 No Cracks Heat Aged per para 3.8 No Cracks 3.12.7 Oil Resistance No splitting, (Test Method per para 3.9) cracking or delamination Test Method: After conditioning, separate samples of belt shall be bent around a 25 mm diameter mandrel with the teeth f
24、acing inwards and outwards respectively. 3.12.8 Tooth Shear Resistance (FLTM BP 111-01, Procedure A) Original, min 0.9 kN/cm width Heat Aged, min 0.9 kN/cm width (Test Method per para 3.7) Heat Aged, min 0.9 kN/cm width (Test Method per para 3.8) After Immersion in ASTM Oil No.1, min 0.8 kN/cm width (Test Method per para 3.9, belt to be wiped dry with a cloth before fixing to jig). -,-,-