1、 WORLDWIDE ENGINEERING STANDARDS General Specification GMW14675 Exhaust System Isolator Requirements and Tests Copyright 2012 General Motors Company All Rights Reserved August 2012 Originating Department: North American Engineering Standards Page 1 of 4 1 Introduction Note: Nothing in this standard
2、supercedes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Scope. This General Specification contains the general requirements and associated tests regarding exhaust system isolators. Materials
3、 covered by this specification are divided into three types. 1.1.1 Type A. Ethylene propylene diene monomer (M-class) rubber (EPDM) for +125 C permanent temperatures. 1.1.2 Type B. Vinyl Methyl Silicone (VMQ) for +150 C permanent temperatures. 1.1.3 Type C. Drawing defined (e.g., using SAE J200 or A
4、STM D2000 line callout). 1.2 Mission/Theme. Exhaust system isolators are used to attach the exhaust system to the vehicle and provide isolation from exhaust system structure borne noise and vibration. 1.3 Classification. Not applicable. 2 References Note: Only the latest approved standards are appli
5、cable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D2000 ISO 1431-1 ISO 23529 ISO 188 ISO 7619-1 SAE J200 2.2 GM Standards/Specifications. GMW3059 GMW14203 GMW14566 GMW14739 GMW3116 GMW14473 GMW14682 GMW16331 2.3 Additional References. Relevant Part Math Data Global Genera
6、l Assembly Manufacturing Bill of Process 3 Test Preparation and Evaluation 3.1 Resources. According to the relevant test procedure. 3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a valid calibration label. 3.1.2 Alternatives. Alternative test facil
7、ities and equipment may also be used. However, all measuring variables as specified in this standard shall be determined correctly with respect to their physical definition. 3.1.3 Facilities. According to the relevant test procedure. 3.1.4 Equipment. According to the relevant test procedure. 3.1.5 T
8、est Vehicle/Test Piece. According to the relevant test procedure. 3.1.6 Test Time. According to the relevant test procedure. 3.1.7 Test Required Information. According to the relevant test procedure. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM
9、 WORLDWIDE ENGINEERING STANDARDS GMW14675 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 2 of 4 3.1.8 Personnel/Skills. According to the relevant test procedure. 3.2 Preparation. According to the relevant test procedure. 3.3 Conditions. 3.3.1 Environmental Conditions. Acc
10、ording to the relevant test procedure. 3.3.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 3.4 Instructions. According to the relevant test procedure. 3.5 Da
11、ta. According to the relevant test procedure. 3.6 Safety. This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriat
12、e safety and health practices and determine the applicability of regulatory limitations prior to use. 3.7 Documentation. Samples of components or material released to this standard shall be tested for conformity with the requirements of this standard and approved by the responsible GM Department pri
13、or to the start of delivery of production level components or materials. Any change to the component or material, e.g., design, function, properties, manufacturing process and/or location of manufacture requires a new release of the product. It is the sole responsibility of the supplier to provide t
14、he customer, unsolicited, with documentation of any change or modification to the product/process, and to apply for a new release. If not otherwise agreed to, the entire verification test shall be repeated and documented by the supplier prior to start of delivery of the modified or changed product.
15、In some cases, a shorter test can be agreed to between the responsible GM department and the supplier. 3.7.1 Test Results. The test results shall be compiled in a test report. 3.7.2 Deviations from Test Procedure. Deviations from the requirements of the test procedures shall have been agreed upon. S
16、uch requirements shall be specified on component drawings, test certificates, reports, etc. 4 Requirements and Procedure 4.1 Dimensioning. 4.1.1 Component/Assembly Dimensions. See part math data. 4.1.2 Identification and Requirements. The GM trademark and part number to GMW16331, the material design
17、ation to GMW3116 and SAE J200 shall appear at the position marked Z in the part math data. 4.2 Functional Tests. 4.2.1 Noise and Vibration Test. Vehicle level noise and vibration testing per vehicle technical specification and exhaust subsystem technical specification. 4.2.2 Installation Force. Test
18、 to the relevant assembly plant procedure specified by the Global General Assembly Manufacturing Bill of Process (BOP). 4.3 Strength Tests. 4.3.1 Static Strength. 4.3.1.1 Determination of the isolators force-deflection characteristics under uniaxial stress according to GMW14682. Test values, see par
19、t math data. 4.3.1.2 Determination of the isolators tensile strength and elongation to failure according to GMW14739. Test values, see part math data. 4.3.2 Dynamic Strength. 4.3.2.1 Determination of isolator fatigue life according to GMW14473. Test values, see part math data. 4.3.2.2 Determination
20、of isolator dynamic stiffness and loss angle according to GMW14203. Test values, see part math data. 4.4 Stress Measurement. Test to GMW14566. 4.5 Material Tests. See Table 1. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING S
21、TANDARDS GMW14675 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 3 of 4 Table 1: Material Properties Property Test Method Unit Value Hardness Type A and B ISO 7619-1 Shore A 50 5 Type C As specified on drawing/math data file Shore A As specified on drawing Age Resistance
22、(Heat Aging) Type A ISO 188 Method B,168 h - 2 h at +125 C 3 C Change in Hardness Shore A -5 to +15 Type B ISO 188 Method B,168 h - 2 h at +150 C 3 C Change in Hardness Shore A +10 maximum Type C As specified on drawing/math data file Not applicable As specified on drawing Ozone Resistance Type A an
23、d B ISO 1431-1, 50 pphm, 25 C 2 C, 20% strain, visual examination Not applicable No cracks permissible Type C As specified on drawing/math data file Not applicable As specified on drawing Cold Resistance Type A and B ISO 23529, -30 C 3 C; 5 h +1 h Bending test radius 2.5 mm, angle 180 degrees Not ap
24、plicable No cracks Type C As specified on drawing/math data file Not applicable As specified on drawing Permanent Set Type A Isolator attached and loaded as shown on drawing in loaded condition exposed for 100 h 2 h at +125 C 3 C, subsequently released for 30 minutes 1 minute and cooled down at 23 C
25、 5 C mm As specified on drawing Type B Isolator attached and loaded as shown on drawing in loaded condition exposed for 100 h 2 h at +150 C 3 C, subsequently released for 30 minutes 1 minute and cooled down at 23 C 5 C mm As specified on drawing Type C As specified on drawing/math data file Not appl
26、icable As specified on drawing 5 Provisions for Shipping Not applicable. 6 Notes 6.1 Glossary. Not applicable. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14675 Copyright 2012 General Motors Company All Right
27、s Reserved August 2012 Page 4 of 4 6.2 Acronyms, Abbreviations, and Symbols. BOP Bill of Process EPDM Ethylene propylene diene monomer (M-class) VMQ Vinyl Methyl Silicone 7 Additional Paragraphs 7.1 All parts or systems supplied to this standard must comply with the requirements of GMW3059, Restrict
28、ed and Reportable Substances for Parts. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: GMW14675 Type X Where: X = Material type as defined in Section 1.1 9 Release and Revisions This standard was originated in October 2005. It was first approved by
29、the Global Exhaust Center in March 2006. It was first published in October 2006. Issue Publication Date Description (Organization) 1 OCT 2006 Initial publication. 2 JUL 2007 Reworked with Type A, B and C; Revised title. (Powertrain Integration) 3 AUG 2012 Revised to current template. Updated references and wording in paragraph 4.1.2, 4.2.1, and 4.3.2.2. Revised title. (Global Exhaust GSSLT) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
