1、WORLDWIDEENGINEERINGSTANDARDSTest Procedure GMW16837Brake Hose Fluid Volume Uptake Under Pressurization Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Originating Department: North American Engineering Standards Page 1 of 41 ScopeNote: 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 takeprecedence.1.1 Purpose. This test procedure shall be used to determine the amount of internal hose volume increase thatoccurs under pressurization at both ambient and e
3、levated temperatures.1.2 Foreword. Not applicable.1.3 Applicability. Measurement of volume increase of brake hoses when pressurized.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.None2.2 GM Standards/Specifications
4、GMW30563 Resources3.1 Facilities. Not applicable.3.2 Equipment.3.2.1 One linear unit with electric stepper motor.3.2.2 One pressure actuation cylinder.3.2.3 Two ceramic stop valves.3.2.4 One filler/bleeder.3.2.5 One pressure gauge.3.2.6 One travel sensor.3.2.7 One measurement recording/evaluating s
5、ystem.3.2.8 The configuration of the test stand for the measurement shall be as indicated in Figure 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
6、STANDARDS GMW16837 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 2 of 41 Engine2 Alternator3 Limit switch 14 Limit switch 25 Pressure actuation cylinder6 Valve 17 Valve 28 Valve 39 Brake hose10 Electro pneumatic control11 Filler/bleeder12 Brake fluid reservoirFigure 1: T
7、est Stand for Volume Uptake Measurement3.3 Test Vehicle/Test Piece.3.3.1 Test Material. The number of brake hoses to be tested is dependent on the material specificationreferencing this test procedure (e.g., GMW3056). The default number is six samples.3.4 Test Time. Not applicable.3.5 Test Required
8、Information. Not applicable.3.6 Personnel/Skills. Not applicable.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 GMW16837 Copyright 2012 Gen
9、eral Motors Company All Rights ReservedOctober 2012 Page 3 of 44 Procedure4.1 Preparation. Per the material specification (e.g., GMW3056) referencing this test procedure.4.2 Conditions.4.2.1 Environmental Conditions. Not applicable.4.2.2 Test Conditions. Deviations from the requirements of this stan
10、dard shall have been agreed upon. Suchrequirements shall be specified on component drawings, test certificates, reports, etc.4.3 Instructions.4.3.1 Test Procedure.4.3.1.1 Determination of the volume uptake of the test stand line length (zero measurement) VL.The brake hose shall be replaced by using
11、the smallest piece of brake line possible. Following fill/bleed, to4.3.1.4 and 4.3.1.5 the test program shall be completed as specified in 4.3.1.6.4.3.1.2 Determination of the gross brake hose volume uptake (hose measurement) VB.The brake hose shall be connected using the smallest piece of brake lin
12、e possible, unless a specific length ofbrake hose is specified by the material specification referencing this test procedure (e.g., GMW3056).Pre-treated brake hoses can be installed in addition to new brake hoses.4.3.1.3 The brake hoses shall be elongated and installed vertically.4.3.1.4 The line sy
13、stem shall be topped up with brake fluid (DOT4) and subsequently bled.4.3.1.5 After the brake hose has been installed and filled/bled, the test program shall be completed asspecified in 4.3.1.6.4.3.1.6 The program consists of 5 actuation cycles. Each actuation cycle shall consist of pressurization f
14、rom0 MPa (0 psig) to the measurement pressure. Once the nominal pressure has been attained, a de-pressurizingphase shall immediately follow (no pressure retention period).Pressure actuation cylinder volume flow in forward/reverse feed: = 3/sPause between pressure increases: tp = 2 minutes5 Data5.1 C
15、alculations. The amount of brake fluid volume uptake shall be determined using the pressure actuationcylinder piston surface and piston stroke:V = x (Dk2/4) x SkWhere:V = Volume uptakeDk = Diameter of cylinder pistonSk = Stroke of cylinder pistonThe net brake hose volume uptake VN shall be calculate
16、d to:VN = VB - VLAll net values shall be reported.Where:VB = The gross brake hose volume uptake (hose measurement)VL = The volume uptake of the test stand line length (zero measurement)VN = The net volume uptake of brake hose5.2 Interpretation of Results. Not applicable.5.3 Test Documentation. With
17、reference to this test procedure, the results of the measurements shall bepresented in a test report.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 S
18、TANDARDS GMW16837 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 4 of 46 SafetyThis standard may involve hazardous materials, operations, and equipment. This standard does not propose toaddress all the safety problems associated with its use. It is the responsibility of t
19、he user of this standard toestablish appropriate safety and health practices and determine the applicability of regulatory limitations priorto use.7 Notes7.1 Glossary. Not applicable.7.2 Acronyms, Abbreviations, and Symbols. Not applicable.8 Coding SystemThis standard shall be referenced in other do
20、cuments, drawings, etc., as follows:Test to GMW168379 Release and RevisionsThis standard was originated in July 2012. It was first approved by the Global Elastomers Team in October2012. It was first published in October 2012.Issue Publication Date Description (Organization)1 OCT 2012 Initial publication.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
