1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14766 Transmission Cable Efficiency and Lash Test Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: North American Engineering Standards Page 1 of 5 1 Scope Note: Nothing in this standard supercedes appli
2、cable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. Determine the efficiency and lash characteristics of automatic transmission range selection cables. 1.2 Foreword. This test measures load and
3、 travel characteristics on automatic transmission range selection cables. 1.3 Applicability. This test applies to all passenger cars and light duty trucks. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2
4、 GM Standards/Specifications. None 2.3 Additional References. None. 3 Resources 3.1 Facilities. 3.1.1 GMNA Test Laboratory or other comparable facility. 3.1.1.1 Bedplate, mandrel fixture. 3.2 Equipment. 3.2.1 Equipment specified is used by GMNA Test Laboratories. Substitution of other comparable equ
5、ipment is permitted. 3.2.2 Test fixture as per Figure A1 in Appendix A. 3.2.3 Linear actuator with speed control (Industrial Devices). 3.2.4 Two (2) load cells. 3.2.5 Linear Variable Displacement Transducer (LVDT) to measure cable travel. 3.2.6 Data collection software/hardware, three (3) channel mi
6、nimum. 3.2.7 Hydraulic cylinder with valving to provide resistance. 3.3 Test Vehicle/Test Piece. 3.3.1 Test Material Required. Transmission Shift Cable. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14766 Copyr
7、ight 2011 General Motors Company All Rights Reserved October 2011 Page 2 of 5 3.4 Test Time. Not applicable. Calendar time: days Test hours: hours Coordination hours: hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. 4.1.1 Sample
8、inspection: Record part number and remove routing tags after a cursory inspection of parts. 4.1.2 Install cable in the mandrel fixture based on cable molded length as shown in Appendix A. Molded length refers to the cable conduit length measured between the conduit end fittings. 4.1.3 Install cable
9、conduit end fittings in nominal (gauge or bracket) plate per design intent cable bracket and shifter. 4.1.4 Connect the transmission cable end to a nominal ball stud/load cell connected to hydraulic cylinder. 4.1.5 Connect shifter cable end to a nominal ball stud on the linear actuator. 4.1.6 Cycle
10、cable through full travel to ensure proper resistance. 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. 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,
11、reports, etc. 4.3 Instructions. 4.3.1 Efficiency. 4.3.1.1 Pull cable through full travel at 12.5 mm/s with 67 N resistance attached to cable end. Record the force to pull cable versus cable travel. 4.3.1.2 Push cable through full travel at 12.5 mm/s with 67 N resistance attached to cable end. Record
12、 the force to push cable versus cable travel. 4.3.1.3 Repeat 4.3.1 with 133 N resistances. 4.3.2 Lash. 4.3.2.1 With cable in routed position, attach output end to a fixed nominal ball stud. 4.3.2.2 Apply an alternating 17.8 N force to input end of cable and record total travel of input end. 4.3.2.3
13、Repeat 4.3.2.2 with 67 N. 5 Data 5.1 Calculations. Cable efficiency is calculated by dividing the resistance by the peak force required to move the cable. The peak force is to be obtained within the center 90% of full cable travel. 5.2 Interpretation of Results. Taking information for the plots and
14、applying efficiency formula. 5.3 Test Documentation. Reference plots of cable force versus travel and data sheets. 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 r
15、esponsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS
16、 GMW14766 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 5 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. LVDT Linear Variable Displacement Transducer 8 Coding System This standard shall be referenced in other documents, drawings, et
17、c., as follows: Test to GMW14766 9 Release and Revisions This standard was originated in October 2005. It was first approved by the Global Chassis Center in December 2005. It was first published in January 2006. Issue Publication Date Description (Organization) 1 JAN 2006 Initial publication. 2 DEC
18、2006 Section 5.1, 5.2 and 5.3 revised. Table A1 and Table A2 added. See Appendix A. (PT Integration) 3 OCT 2011 Revised to current template. (Shift System GSSLT) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14
19、766 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 4 of 5 Appendix A Table A1: Efficiency (Data Sheet) Resistance Load N (A) Pull Peak Force N (B) Push Peak Force N (C) Pull Efficiency % (A/B) 100% Push Efficiency % (A/C) 100% 67 133 Note: Peak force is selected from the
20、 plots between 5% and 95% of cable travel. Additional Comments: Table A2: Cable Lash (Data Sheet) Cable Alternating Load N Total Cable Movement (Lash) mm 17.8 67 Additional Comments: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14766 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 5 of 5 Test Fixture Mandrel A: Molded Length 1200 mm Figure A1: Transmission Cable Test Fixture Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
