1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 06 24 N-STATUS No replacement named C. Mracna, NA 2006 08 17 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.13, 3.14 & 4 2000 04 05 Activated B. Hennessey Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page
2、1 of 4 DRIVE BELT, TOOTHED, HYDROGENATED NITRILE WSS-M96D15-A5 RUBBER (HNBR), GLASS TENSION CORDS, SINGLE FACING FABRIC NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a toothed drive belt based on 80 IRHD Hydrogenated Nitrile rubber (HNBR) with a single layer of
3、 polyamide facing fabric and glass fiber tension cords. The belt is suitable for use where average service temperatures up to 125 C and peak service temperatures up to 140 C are experienced. The belt is oil and water resistant and remains flexible down to -40 C. 2. APPLICATION This specification was
4、 originally released for material 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 F
5、or Production Materials (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 f
6、abric except on belts with lengths greater than 9250 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 by
7、a rubber the same 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
8、 from finished 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 sheets shall have the following dimensions: 150 x 150 mm, min x 2.0
9、+/- 0.2 mm 3.6 ORIGINAL PROPERTIES 3.6.1 Hardness, International 72 - 82 IRHD (ISO 48) ENGINEERING MATERIAL SPECIFICATIONWSS-M96D15-A5Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 2 of 4 3.6.2 Tensile Strength, min 15.0 MPa (ISO 37, Die C) 3.6.3 Elongation at Bre
10、ak, min 230% (Test Method according to para 3.6.2) 3.6.4 Modulus at 100% Elongation, min 8.0 to 12.5 MPa (Test Method according to para 3.6.2) 3.6.5 Brittleness Point, max -40 C (ISO 812, Type B specimen) 3.6.6 Compression Set, %, max 50% (ISO 815 Method B except 25% compression, plied-up specimens,
11、 70 h at 125 C +/- 2 C) 3.7 HEAT AGED (ISO 188, 150 +/- 50 air changes/h, 1000 h at 125 +/- 2 C) 3.7.1 Hardness Change, max +10 3.7.2 Tensile Strength Change, max -30% 3.7.3 Elongation at Break Change, max -50% 3.8 HEAT AGED (ISO 188, 150 +/- 50 air changes/h, 168 h at 140 +/- 2 C) 3.8.1 Hardness Ch
12、ange, max +10 3.8.2 Tensile Strength Change, max -30% 3.8.3 Elongation at Break Change, max -50% 3.9 IMMERSION IN OIL No.1 (ISO 1817, 168 h at 140 +/- 2 C) 3.9.1 Hardness Change -7 to +7 IRHD 3.9.2 Tensile Strength Change, max -20% max 3.9.3 Elongation at Break Change, max -25% max 3.9.4 Volume Chan
13、ge, max -15 to +15% 3.10 TENSION CORDS Glass fiber, multifilament spun with S twist and Z twist alternated. ENGINEERING MATERIAL SPECIFICATIONWSS-M96D15-A5Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 3 of 4 3.11 FACING FABRIC A single layer of woven polyamide sp
14、un 6 or 66 fabric. The facing fabric construction shall be such that the requirement of this Material Specification and any Engineering Component specification relating to the toothed belt are met. 3.12 FINISHED PART 3.12.1 Hardness, International (ISO 48, Micro Method) Back 71 - 81 3.12.2 Breaking
15、Load Test Method: Tests to be conducted on complete belts by pulling at 25 mm/minute between two 114 mm cylinders mounted with teeth facing outwards. One of the cylinders shall turn freely to equalize stress in the belt. The belt shall be 20 +/- 0.5 mm wide unless otherwise stated on the Engineering
16、 Drawing. Original, min 18 kN/20 mm Heat Aged, min 18 kN/20 mm (Test Method per para 3.7) Heat Aged, min 18 kN/20 mm (Test Method per para 3.8) After Immersion in Oil No. 1, min 18 kN/20 mm (Test Method per para 3.9) After Immersion in 5% 15 kN/20 mm Sodium Chloride Solution, min (168 h at 60 +/- 2
17、C) 3.12.3 Face Fabric Adhesion to Rubber Test Method: The face fabric shall be separated from the rubber at 50 mm/minute on a tensile testing machine giving a continuous autographic load record. From the load record for each tooth stripped of its fabric, calculate the max peak force and the minimum
18、valley force. Determine the mean peak and valley forces for at least 6 consecutive teeth. In some cases it may be found that the fabric breaks instead of peeling from the rubber. This shall be noted in the results and be deemed acceptable providing the value at which breakage occurs exceeds the spec
19、ified Valley requirement. Original, min Peak: 100 N/cm Valey: 20 N/cm Heat Aged, min Peak: 100 N/cm (Test Method per 3.7) Valley: 15 N/cm Heat Aged, min Peak: 100 N/cm (Test Method per 3.8) Valley: 12 N/cm ENGINEERING MATERIAL SPECIFICATIONWSS-M96D15-A5Printed copies are uncontrolled Copyright 2010,
20、 Ford Global Technologies, LLC Page 4 of 4 After Immersion in Peak: 100 N/cm Oil No.1, min (Test Method per 3.9) Valley: 15 N/cm 3.12.4 Heat Aged No Cracks (Test Method per para 3.7) Test Method: After aging the belt shall be bent around a 25 mm diameter mandrel, the teeth facing inwards and outward
21、s 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 3.12.6 Low Temperature Flexibility (168 h at -40 +/-2 C) Test Method: After conditioning, the belt shall be bent within 1 s around a temperature conditione
22、d 25 mm diameter mandrel. Separate samples of belt shall be tested with teeth facing inwards and outwards respectively. The belts shall be examined at 2X magnification. 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 Metho
23、d 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 facing inwards and outwards respectively. 3.12.8 Tooth Shear Resistance (FLTM BP 111-01, Procedure A or B) Original, min 0.9 kN/cm width Heat Aged, min 0.7 kN/cm width (Test Method per para 3.7) Heat Aged, min 0.8 kN/cm width (Test Method per para 3.8) After Immersion in Oil No.1, min 0.8 kN/cm width (Test Method per para 3.9, belt to be wiped dry with cloth before fixing to jig)
