1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW15675 Friction Coefficient of Window Regulator Tube 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 b
2、etween the English and domestic language, the English language shall take precedence. 1.1 Purpose. To determine the friction coefficient of window-regulator tube, which affects the performance of glass guidance system. The information is used in Computer Aided Engineering (CAE) model to predict the
3、performance of glass guidance system. 1.2 Foreword. Not applicable. 1.3 Applicability. This procedure applies to all cable-drive regulator system. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Stand
4、ards/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 also be used. However, all measuring v
5、ariables as specified in this standard shall be determined correctly with respect to their physical definition. 3.2 Equipment. 3.2.1 Fixed rigid fixture that can support a cable conduit with a 100 mm radius. 3.2.2 Weights. 3.3 Test Vehicle/Test Piece. Production intent cable conduit and production i
6、ntent cable with product intent cable end fittings. 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
7、C 2 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. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for
8、ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15675 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 2 of 4 4.3 Instructions. Where: T1 = Hanging weight 1 T2 = Hanging weight 2 r = Radius of cable conduit in
9、 fixture = 100 mm Figure 1: Cable Conduit and Weight Setup 4.3.1 Mount the tube/cable subassembly in a fixed rigid fixture with a contact angle of 180 degrees. Remain equal length for both ends. The radius in the bend in the conduit shall be 100 mm. 4.3.2 Hang equal weight to each end of cable. Reco
10、rd the weight (T2) as shown in Figure 1. 4.3.3 Gradually increase weight to one (1) end of cable until the cable begins to move. Record the final weight (T1). 4.3.4 Substitute T1, T2 into 5.1 Equation 1 and calculate the friction coefficient ut. 4.3.5 Change the balance weight (T2), and repeat 4.3.2
11、 through 4.3.4 for another four (4) estimates. 4.3.6 Average the five (5) estimates. 5 Data 5.1 Calculations. The friction coefficient of the tube is estimated per Equation 1. 2121TT1TT1ut Equation 1 Where: T1 = Hanging weight 1 T2 = Hanging weight 2 ut = Friction coefficient of conduit r Copyright
12、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 GMW15675 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 3 of 4 5.2 Interpr
13、etation of Results. Not applicable. 5.3 Test Documentation. Document results on Data Sheet A1. 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
14、 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. Glass Guidance System: A hardware subsystem of side door, endgate, or midgate which controls the movement of window glass. Tube: M
15、ovement of the steel cable follows a fixed pattern maintained by the rotating pulleys and sliders. The steel cable goes through a plastic tube at the locations adjacent to the motor or crank. Window Regulator: A hardware subsystem of glass guidance system which provides the mechanism of glass moveme
16、nt. 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 GMW15675 9 Release and Revisions This standard was originated in September 2007. It was first approved by the Global
17、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 Motors Company Provided by IHS under license
18、 with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15675 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 4 of 4 Appendix A Data Sheet A1: Calculation Results Body Make Analyst
19、 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-,-,-
