1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14418 Steering Wheel Torsional Test Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 1 of 6 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflict between the Engl
2、ish and domestic language, the English language shall take precedence. 1.1 Purpose. In driving operation and in particular during parking maneuvers torsional loads are applied to the steering wheel. The purpose of this test is to determine the effect of such loads on the service life of the steering
3、 wheel. A torque of 70 Nm maximum may be applied to the steering wheel rim when the driver is seated in normal seat position. This value shall be used for the test. 1.2 Foreword. Not applicable. 1.3 Applicability. Steering wheels of the entire vehicle range. 2 References Note: Only the latest approv
4、ed standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Facilities. 3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a v
5、alid calibration label. 3.1.2 Alternatives. Alternative test facilities 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. 3.2 Equipment. 3.2.1 Clamping fixture to hold steering wheel
6、 rim. 3.2.2 Steering column shaft with torsion arm (See Figure 1). 3.2.3 Pneumatic or hydraulic actuator with manual or automatic force control. Optional: Direct connection of column shaft to hydraulic rotary actuator capable of 70 Nm torque (See Figure 2). 3.3 Test Vehicle/Test Piece. Require three
7、 (3) steering wheel armatures. 3.4 Test Time. Not applicable. Calendar time: days Test hours: hours Coordination hours: hours 3.5 Test Required Information. Not applicable. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or netw
8、orking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14418 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 2 of 6 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. 4.1.1 The steering wheel shall be mounted on the steering co
9、lumn shaft. The nut/bolt shall be tightened with the minimum torque. Wait for fastener adhesive patch to cure before proceeding with torsional test as specified by adhesive supplier. Note: If not specified wait 72 h (See Appendix A). 4.1.1.1 Paint stripe the fastener to the wheel interface (See Figu
10、re 3). 4.1.2 The steering wheel shall be clamped with the shaft to the fixture at steering wheel rim. 4.1.3 The actuator (hydraulic or pneumatic) shall be connected with the torsion arm of the steering shaft (See Figure 1). Note: Optional rotary actuator attachment (See Figure 2). 4.2 Conditions. 4.
11、2.1 Environmental Conditions. The test shall be performed at + 23 C 5 C. 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. 4.2.2.1 The test frequency shall
12、 be 1.5 Hz. A sine wave shall be aimed. Note: If using rotary actuator test frequency target of 60 cycles/minute (1 Hz). 4.3 Instructions. 4.3.1 The actuator shall be adjusted to produce a torsional load on the steering wheel of 70 Nm maximum attainable at the steering wheel hub. 4.3.2 After complet
13、ion of 325 000 cycles, the residual torque of the shaft nut/bolt shall be determined and recorded. 4.3.3 The steering wheel shall be inspected for cracks and defects of the armature assembly. 4.3.4. Record if nut/bolt movement from paint stripe. 5 Data 5.1 Calculations. Not applicable. 5.2 Interpret
14、ation of Results. 5.2.1 No cracks or defects of the armature assembly are permissible before the specified number of cycles are completed. 5.2.2 Steering wheel fastener shall not rotate from initial scribe mark. 5.2.3 Steering wheel attachment to steering shaft shall be “tight” with no increase in a
15、xial and radial lash. 5.2.4 Steering wheel fastener break-away torque shall be 5 Nm. 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 ENGINEERING STANDARDS GMW1441
16、8 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 3 of 6 Figure 1: Test Setup Key 1 = Actuation Cylinder 2 = Steering Wheel Assembly (clamped) 3 = Torsion Arm L = Length of Torsion Arm F = Calculation (70 Nm = Force x length of torsional arm L) Figure 2: Hydraulic Rotary
17、Actuator 2F1L3Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14418 Copyright 2013 General Motors Company All Rights Reserved January 201
18、3 Page 4 of 6 Figure 3: Paint Stripe Note: Example shows bolt movement. 5.3 Test Documentation. With reference to this test method, the results shall be added to a test report. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to addres
19、s all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and
20、 Symbols. DC Direct Current RPM Rotations Per Minute 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW14418 9 Release and Revisions This standard was originated in September 2005. It was first approved by Interiors in March 2006. It was fir
21、st published in May 2007. Issue Publication Date Description (Organization) 1 MAY 2007 Initial publication. 2 JAN 2013 5 Year Refresh. Added optional equipment with pictures. Added number of cycles. (Interiors - Airbags/Steering Wheels/Safety Belts) Copyright General Motors Company Provided by IHS u
22、nder license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14418 Copyright 2013 General Motors Company All Rights Reserved January 2013 Page 5 of 6 Appendix A A1 Steering Wheel to Steering Column To
23、rque Analysis A1.1 Use Direct Current (DC) electric or similar calibrated torque controlled power tooling set to 40 Nm final torque target (or as specified) to assemble bolt. A1.2 Tooling RPM is required for analysis: 350 rpm. A1.3 Tool settings: 350 rpm to 15 Nm, downshift to 150 to 250 rpm for rem
24、ainder of rundown to final torque. A1.4 Perform static torque audit within 3 to 5 minutes of initial assembly using calibrated torque wrench. (See Figure A1). Figure A1: Static Torque Measurement Instructions A1.5 Provide torque versus angle signature (See Figure A2) of the rundown from zero degrees
25、 angle point to final torque. 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 ENGINEERING STANDARDS GMW14418 Copyright 2013 General Motors Company All Rights Rese
26、rved January 2013 Page 6 of 6 Figure A2: Torque/Angle Signature Example Note: Torque/Angle Signature Illustration to 30 Nm Target. Three (3) samples Prevailing Torque 5 Nm. Joint seat at 10 Nm. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
