1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14594 Steering Wheel Bending Strength Copyright 2012 General Motors Company All Rights Reserved August 2012 Originating Department: North American Engineering Standards Page 1 of 10 1 Scope Note: Nothing in this standard supercedes applicable laws a
2、nd regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. To determine the deflection under load of all the variant (Polyurethane/Leather Wrap and or Wood) steering wheels, with a representative Driver Air Bag (
3、DAB) Module/Horn pad, when a bending load is applied at the Rim Position of 12:00 and 6:00. 1.2 Foreword. Not applicable. 1.3 Applicability. Steering wheels used in passenger cars, Multipurpose Passenger Vehicles (MPV), and trucks. 2 References Note: Only the latest approved standards are applicable
4、 unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 2.3 Additional References. Steering Wheel Load Stiffness Calculator (CG2982) (Provided by IHS the GM Document Resource for Engineering Standards.) 3 Resources 3.1 Facilities. Not applicable
5、. 3.2 Equipment. 3.2.1 Tensile compression test machine or equivalent capable of transmitting up to 2500 25 N, at a rate of deflection of 25 2.5 mm per minute and measuring and recording that deflection in a Microsoft Office 2007 Excel compatible format (sample rate of 0.1 mm increments or finer). T
6、est ambient temperature must be controlled to 23 5 C. 3.2.2 Metal-faced load application device as described in Appendix A, Figure A3, Figure A4, Figure A5 and Figure A6. 3.2.3 Fixture to support the steering wheel such that a load can be applied either in a direction parallel to the axis of the ste
7、ering wheel hub (12:00 oclock alignment) or 30 degrees from that direction (6:00 oclock alignment). 3.2.4 Bearing Lubricant. 3.2.5 Steering Wheel Rim Stiffness Calculator Excel File (Microsoft Office 2007 Excel). Note: All instrumentation is to be calibrated as required; record instrumentation detai
8、ls and date of calibration on Data Sheet A1 (see Appendix A), unless the information is otherwise preserved in the testing laboratory records. 3.3 Test Vehicle/Test Piece. Not applicable. 3.4 Test Time. Not applicable. Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
9、nse from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14594 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 2 of 10 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 3.7 Development/Validation Items. 3.7.1 Test Material. Complete steerin
10、g wheel assemblies with a representative DAB module; i.e., all variants (Polyurethane/Leather Wrap and or Wood) of the steering wheel with DAB module. An untested steering wheel is required for each Rim Stiffness Test at 12:00 and 6:00. 4 Procedure 4.1 Preparation. 4.1.1 Rim Stiffness at 12:00 (For
11、Each Variant). 4.1.1.1 Mount the steering wheel on the horizontal support fixture and secure it to the loading machine table. Locate the 12:00 midpoint of the upper unsupported rim span in line with the vertical load application device pad (see Appendix A, Figure A1). 4.1.1.2 Apply bearing lubricant
12、 as needed. Record the ambient temperature. 4.1.1.3 Align the loading pad such that its 64 mm dimension is radial to the steering wheel (see Appendix A, Figure A1). Note: Start load pad at one end of linear bearing to allow for linear translation due to steering wheel deformation. 4.1.2 Rim Stiffnes
13、s at 6:00 (For Each Variant). 4.1.2.1 Mount the steering wheel on the support fixture and secure it to the loading machine table. Locate the 6:00 midpoint of the lower rim span 30 degrees from the load application device pad (see Appendix A, Figure A2). 4.1.2.2. Apply bearing lubricant as needed Rec
14、ord the ambient temperature. 4.1.2.3 Align the loading pad such that its 64 mm dimension is radial to the steering wheel (see Appendix A, Figure A2). Note: Start load pad at one end of linear bearing to allow for linear translation due to steering wheel deformation. 4.2 Conditions. 4.2.1 Environment
15、al Conditions. Testing to be conducted at 23 3 C ambient temperature. 4.2.2 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. 4.3 Instructions. 4.3.1 Rim Stiffne
16、ss at 12:00. 4.3.1.1 Move cross head until the load application device pad is within 1 to 2 mm of contact to the 12:00 rim. Zero the load/deflection. 4.3.1.2 Deflect at a cross head rate of 25 2.5 mm per minute until 65 mm of deflection is reached. Collect load deflection data at a sample rate of 0.
17、1 mm increments or finer. 4.3.1.3 Remove Load. 4.3.1.4 Transfer data into Microsoft Excel format in order to use the stiffness calculator. Note: Do not average multiple load/deflection data before calculating stiffness. Do not force fit data into 0.1 mm increments. Calculate 12:00 stiffness: Follow
18、the instructions in the stiffness calculator and record the stiffness results on Data Sheet A2. Attach the summary graph to Data Sheet A2 (see Appendix A). 4.3.2 Bending Strength at 6:00. 4.3.2.1 Move cross head until the load application device pad is within 1 to 2 mm of contact to the 6:00 rim. Ze
19、ro the load/deflection recorder. 4.3.2.2 Deflect at a cross head rate of 25 2.5 mm per minute 65 mm of deflection reached. Collect load deflection data at a sample rate of 0.1 mm increments or finer. 4.3.2.3 Remove Load. Provided by IHSNot for ResaleNo reproduction or networking permitted without li
20、cense from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14594 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 3 of 10 4.3.2.4 Transfer data into a Microsoft Excel format in order to use the 6:00 steering wheel load plotter. Note: Do not average multiple load/deflection da
21、ta before plotting. Plot load/deflection curve: Using stiffness calculator Plot Load/Deflection curve. Attach the summary graph to Data Sheet A2 (see Appendix A). 5 Data 5.1 Calculations. Obtain and use the steering wheel load stiffness calculator (CG2982) from IHS the GM Document Resource for Engin
22、eering Standards. 5.2 Interpretation of Results. The 12:00 rim stiffness used in the upper rim load calculation is the slope of the armature deflection versus load during its initial elastic deformation. Compression of the armature covering (wrap) prior to armature deformation (non-linear/lower forc
23、e immediately following contact of loading device to covering) is not to be used in determining the 12:00 rim stiffness as shown in Figure 1. Likewise, non-linear deflection versus load (plastic) deformation following the initial elastic deformation is not to be used in determining the upper rim sti
24、ffness as shown in Figure 1. Typically 12:00 rim displacements from 4 to 7 mm are in the elastic region, however, the elastic region is wheel specific. It is recommended to select the longest linear region defined by the elastic region to improve the accuracy of the calculation. Figure 1: Typical Lo
25、ad/Deflection Curve 5.2.1 Stiffness Calculator Warning Boxes. 5.2.1.1 Consistency of Data Check Box. If this warning box is displayed during stiffness calculation, verify the test data for mechanical and or electronic signal noise. Consider items such as, steering wheel attachment, load device, fixt
26、ure to mounting plate, load cell, test recording. Consistency flag will be recorded on plot. 5.2.1.2 Solution Not Found Warning Box. If this warning box is displayed during stiffness calculation, verify the test data for mechanical and or electronic signal noise. Also verify that the data is in the
27、correct format and has been entered properly. If the test data is considered to be valid consult the responsible engineer for manual calculation. 5.2.2 Do not rename Master Template Tabs in the Calculator. 5.3 Test Documentation. Record pertinent test results on the supplied data sheets (see Appendi
28、x A). 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 C om p r e s s i on of a r m a t u r e cov e r i n gP e r m a n
29、 e n t ( p l a s t i c) a r m a t u r e d e f or m a t i on X YE l a s t i c a r m a t u r e d ef o r m a t i o n1 2 : 0 0 S t i f f n e s s = Y / XforceProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14594 Copyr
30、ight 2012 General Motors Company All Rights Reserved August 2012 Page 4 of 10 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. 12:00: Midpoint of the upper unsupported rim span. 6:00: Midpoint of the lower
31、 rim span. 7.2 Acronyms, Abbreviations, and Symbols. DAB Driver Air Bag MPV Multipurpose Passenger Vehicles 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW14594 9 Release and Revisions This standard was originated in October 2005. It was
32、first approved by the Steering Wheel Global Subsystem Leadership Team in March 2006. It was first published in March 2006. Issue Publication Date Description (Organization) 1 MAR 2006 Initial publication. 2 AUG 2012 5 year refresh, revise fixture, remove manual stiffness calculation and add steering
33、 wheel stiffness calculator reference. (Interiors) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14594 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 5 of 10 Appendix A Figure A1: Ty
34、pical 12:00 Rim Setup Figure A2: Typical 6:00 Rim Setup Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14594 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 6 of 10 Figure A3: Test Fix
35、ture Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14594 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 7 of 10 Figure A4: Cross Head/Load Cell Adapter (all dimensions are in millime
36、ters (mm) Figure A5: End Cap Details (all dimensions are in millimeters (mm) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14594 Copyright 2012 General Motors Company All Rights Reserved August 2012 Page 8 of 1
37、0 Figure A6: Metal Pusher Block with Holes for Linear Bearing Attachment Flange (all dimensions are in millimeters (mm) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14594 Copyright 2012 General Motors Company
38、All Rights Reserved August 2012 Page 9 of 10 Data Sheet A1: Instrument Calibration Report Number: _ Submit this data sheet with the other data sheets when the information is not otherwise preserved in the testing laboratory records. Test Procedure Number GMW14594 Test Date _ Instrument Description I
39、nstrument Number Calibration Date Next Calibration Due Date 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Recorded by: Date: (Signature) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14594 Copyright 2012 G
40、eneral Motors Company All Rights Reserved August 2012 Page 10 of 10 Data Sheet A2: Steering Wheel Bending Strength Part Data Test/Report Number: _ Report Date: _ Vehicle Make: _ Model: _ Year: _ Part Description: _ Steering Wheel Assembly Number: _ Circle One: Prototype or Production. TEST DATA Ambi
41、ent Temperature: _ C. Per 4.3 Deflection and Stiffness. Per 4.3.1.4 12:00 Rim Stiffness Note 1 _N/mm 12:00 Rim Stiffness Note 1 _N/mm 12:00 Rim Stiffness Note 1 _N/mm 12:00 Rim Stiffness Note 1 _N/mm Per 4.3.2.4 6:00 Rim Load/Deflection Curve Note 1: Record Stiffness Result from the Calculator. Per 5.2.1.1 Consistency of Data Confirmed. _ _ Tested By: _ Date: _ (Signature) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
