1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW15673 Friction Coefficient of Window Regulator Pulley Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 1 of 4 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflict
2、 between the English and domestic language, the English language shall take precedence. 1.1 Purpose. The purpose of this procedure is to determine the friction coefficient of window-regulator pulley, which affects the performance of glass guidance system. The information is used in Computer Aided En
3、gineering (CAE) model to predict the performance of glass guidance system. 1.2 Foreword. Not applicable. 1.3 Applicability. This procedure applies to all cable-drive regulator systems. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Stand
4、ards/Specifications. None 2.2 GM Standards/Specifications. None 3 Resources 3.1 Facilities. Not applicable. 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 facilities and equipment may
5、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 Fixed rigid fixture with pulley riveted per production process. 3.2.2 Weights. 3.3 Test Vehicle/Test Piece. Pulley and pulley riv
6、et are to be production intent components. 3.4 Test Time. Not applicable. 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. Not applicable. 4.2 Conditions. 4.2.1 Environmental Conditions. Conduct tests at ambient conditions 22 C 2 C. Co
7、pyright 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 GMW15673 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 2 of 4 4.2
8、.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. Fg Where: r1 = Pulley radius (measured from center to inside of the cable groove) r2 = Pul
9、ley rivet radius T1 = Hanging weight 1 T2 = Hanging weight 2 Figure 1: Pulley and Rivet Test Setup 4.3.1 Mount the rotating pulley in a fixed rigid fixture. Attach cable with a contact angle of 180 degrees. Remain equal length for both ends. 4.3.2 Measure the inner and outer radius of the rotating p
10、ulley (r1, r2) as shown in Figure 1. 4.3.3 Hang equal weight of 100 N (T2) to each end of cable as shown in Figure 1. 4.3.4 Gradually increase weight to one (1) end of cable until the cable begins to move. Record the final weight (T1). 4.3.5 Substitute T1, T2 into 5.1 Equation 1 to calculate the fri
11、ction coefficient s. 4.3.6 Change the balance weight (T2), and repeat 4.3.2 through 4.3.4 for another four (4) estimates (T2 = 200 N, 300 N, 400 N and 500 N). 4.3.7 Average the five (5) estimates. 5 Data 5.1 Calculations. The friction coefficient of pulley is estimated per Equation 1. 1r2r1r2r2T1T12
12、T1Tsu Equation 1 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 GMW15673 Copyright 2013 General Motors Company All Rights Reserved August 2
13、013 Page 3 of 4 Where: r1 = Pulley radius (as described in Figure 1) r2 = Pulley rivet radius T1 = Hanging weight 1 T2 = Hanging weight 2 us = Friction coefficient of pulley 5.2 Interpretation of Results. Not applicable. 5.3 Test Documentation. Document results on Data Sheet A1. 6 Safety This standa
14、rd 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 appropriate safety and health practices and determine the applicability of regu
15、latory limitations prior to use. 7 Notes 7.1 Glossary. Glass Guidance System: A glass guidance system is a hardware subsystem of side door, endgate, or midgate, which controls the movement of window glass. Pulley: A rotating pulley consists of a nylon wheel having an inner and outer diameter, which
16、rotates around a coaxial fixed metal diameter. Movement of the surrounding steel cable with the relative friction to the outer diameter of the pulley results in relative movement of the pulley to the axial shaft. Window Regulator: A window regulator is a hardware subsystem of the glass guidance syst
17、em, which provides the mechanism of glass movement. 7.2 Acronyms, Abbreviations, and Symbols. CAE Computer Aided Engineering 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW15673 9 Release and Revisions This standard was originated in Sept
18、ember 2007. It was first approved by Global Glass Guidance SSLT in October 2007. It was first published in January 2008. Issue Publication Date Description (Organization) 1 JAN 2008 Initial publication. 2 AUG 2013 Refresh. (Glass Guidance, Mirrors Global Subsystem Leadership Team) Copyright General
19、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 GMW15673 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 4 of 4 Appendix A Data She
20、et A1: Calculation Results Body Make Analyst Body Model and Year Activity Report Body Style (circle one) COUPE SEDAN WAGON VAN Date: Test Run Weight T2 (N) Weight T1 (N) Friction Coefficient Calculated Comments 1 2 3 4 5 Average Friction Coefficient Recorded by: Date: Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
