1、WORLDWIDEENGINEERINGSTANDARDSTest Procedure GMW14439Steering Wheel Bending (Push/Pull) Fatigue Test Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Originating Department: North American Engineering Standards Page 1 of 31 ScopeNote: Nothing in this standard supercedes applicabl
2、e laws and regulations.Note: In the event of conflict between the English and domestic language, the English language shall takeprecedence.1.1 Purpose. The steering wheel is exposed to bending load in driving operation. A particularly high load isapplied by the driver when repositioning himself in t
3、he seat. The purpose of this test is to determine the effectof this load applied on the steering wheel.1.2 Foreword. Not applicable.1.3 Applicability. Steering wheels of the entire vehicle range.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 Extern
4、al Standards/Specifications.None2.2 GM Standards/Specifications.GMW14095 GMW140962.3 Additional References.Steering Wheel Drawing3 Resources3.1 Facilities. Not applicable.3.2 Equipment.3.2.1 Clamping fixture with steering shaft (see Figure 1).Copyright General Motors Company Provided by IHS under li
5、cense with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14439 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 2 of 3F12Figure 1: Test SetupLegend for Figure 1:1 = Actuation Cy
6、linder2 = Steering Wheel AssemblyF = Force3.2.2 Pneumatic or hydraulic cylinder with manual or automatic force control and linear deflectionmeasurement.3.3 Test Vehicle/Test Piece. Test the steering wheel with trim parts and horn control assembly.3.4 Test Time. Not applicable.3.5 Test Required Infor
7、mation. Not applicable.3.6 Personnel/Skills. Not applicable.4 Procedure4.1 Preparation.4.1.1 The steering wheel assembly, including driver airbag/horn pad, and steering shaft shall be installed onthe clamping fixture. The fastener shall be tightened with the minimum specified torque.4.1.2 The cylind
8、er shall be installed to apply a force parallel to the steering shaft axis.4.2 Conditions.4.2.1 Environmental Conditions. The test shall be performed at +23 5 C.4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Suchrequirements shall be specified o
9、n component drawings, test certificates, reports, etc.4.2.2.1 The test frequency shall be 0.66 Hz. A sine wave shall be targeted.4.3 Instructions.4.3.1 The cylinder shall be adjusted to apply a force of 400 N.4.3.2 After completion of the specified cycles or a bending travel of 25 mm at the force-ap
10、plication point,remove steering wheel foam and the steering wheel shall be checked for deformations or cracks.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGI
11、NEERING STANDARDS GMW14439 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 3 of 35 Data5.1 Calculations. Not applicable.5.2 Interpretation of Results.5.2.1 For specified sample sizes, cycles and permissible scattering range see GMW14095 and GMW14096 orthe Steering Wheel Dr
12、awing.If not otherwise stated in the above documents:x N90% 1000 SSP (Load/Vibration Cycles (Schwingspiel) (SSP)x N90% : N10% 1:2x The maximum number of test cycles conducted, can be limited to two times the N90% value.5.2.2 Cracks and defects of the metal structure are permissible when the specifie
13、d number of cycles isexceeded (N90% value). The permanent deformation shall be 2 mm.5.3 Test Documentation. With reference to this test method, the results shall be added to a test report.6 SafetyThis standard may involve hazardous materials, operations, and equipment. This standard does not propose
14、 toaddress all the safety problems associated with its use. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and determine the applicability of regulatory limitations priorto use.7 Notes7.1 Glossary.N10%: Number of load cycles to failure which
15、 is exceeded by 10% of all test samplesN90%: Number of load cycles to failure which is exceeded by 90% of all test samplesForce-Application Point: The point where the maximum load is applied to the steering wheel rim. In generalthe point on the rim with the maximum distance to the steering wheel spo
16、kes.7.2 Acronyms, Abbreviations, and Symbols.SSP Load/Vibration Cycles (Schwingspiel)8 Coding SystemThis standard shall be referenced in other documents, drawings, etc., as follows:Test to GMW144399 Release and RevisionsThis standard was originated in September 2005. It was first approved by Interio
17、rs in March 2006. It was firstpublished in April 2007.Issue Publication Date Description (Organization)1 APR 2007 Initial publication.2 OCT 2012 5 Year Refresh. Added Driver airbag/horn pad to steering wheelassembly. (Interiors)Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
