QCT25-2004标准（英文版）

QC/T 25-2004PrefaceThis standard is the revised version based on QC/T 25-1992.Since the date of implementation, QC/T 25-1992 will be substituted with this standard.The major difference between this standard and QC/T 25-1992 is as follows:-It adjusts the requirements on the sliding friction torque and heat load of the clutch;-It adds the requirements on the sliding friction coefficient and requirements on lid assembly static release durability.This standard is presented by Auto Industry Committee of China.This standard is under the jurisdiction of Auto Standardization Technical Committee.The companies contributing the drafts of this standard: Shanghai Clutch General Factory (now has changed the name as Shanghai Sachs Powertrain Components Systems Co., Ltd.)， Nanjing Valeo Clutch Co., Ltd.），Changchun Yidong Clutch Co., Ltd., Suzhou Branch of Auto Parts of Dongchuan Company.The major draftsmen of this standard: Zhao Yongbin, Chen Xiang, Yuan Nianshi, Song Shundong, and Zhu Fupei.QC/T 25-2004Technical Conditions of the Auto Dry Friction Clutch Assembly1 ScopeThis standard stipulates the terms and definitions, technical requirements, test methods, inspection rules, product ID, package, transportation, and storage of auto dry friction clutch assembly (including lid assembly and driven plate assembly, hereinafter called clutch).This standard applies to auto dry friction clutch.2. Quoted StandardsThe contents in the following standards are referred to constitute the terms of this standard. For all the quotation with dates, the following revision forms (not including amendment) or the revision versions are not applicable to this standard. However, the parties reaching agreements in according to this standard are encouraged to explore the possibility of using the latest version of this standard. For the quotation with no dates noted, the latest versions are applicable to this standard. QC/T 27-2004 The Stand Test Method of Auto Dry Friction Clutch Assembly3 Terms and DefinitionsThe following terms and definitions are applicable to this standard.3.1 Release travelUnder specified work conditions, the release finger (rod) travel from complete connection to complete release.3.2 Release loadThe load on the release finger (rod) end of the lid assembly3.3 LiftUnder the specified release travel, the min. displacement of all points on the work surface of the pressure plate3.4 Pressure plate parallelismUnder the specified release travel, the difference between the max. value and min. value of the displacement of all points on the work surface of the pressure plate3.5 Sliding coefficient of frictionDuring the process of clutch release to connection, the friction coefficient of the sliding friction torque when the complete match of the surface of the press plate with the friction surface of the friction disk.3.6 Drag torqueUnder specified work conditions, when the driven plate are in between the paralleled plates with a specified distance, the smallest torque that could make the driven plate rotate freely.3.7 Free movementUnder specified work conditions, when the driven plate are in between the paralleled plates with a specified distance, the driven plate are applied with a specified torque, the difference between the smallest distance of the paralleled plates, and the distance under specified load clamping conditions.3.8 Adhesive behaviorThe adhesion resistive capability of the clutch under the specified temperature and humidity3.9 Cushion resilience Under a specified preload, the cushion aligned load is applied on the driven plate assembly, the difference of the thickness.QC/T 25-20043.10 Cushion defection characteristicUnder a specified preload, the cushion aligned load is applied on the driven plate assembly, the relation between the thickness change and cushion aligned load.4 Technical Requirements4.1 Lid Assembly Functional Characteristic4.1.1 The assembling height deviation of the release finger (rod) and the end leaping amount of the release finger (rod)Under specified work conditions, the assembling height deviation of the release finger (rod) and the end leaping amount of the release finger (rod) should be no more than the values in Table 1:Table 1 The assembling height deviation of the release finger (rod) of the lid assembly and the end leaping amount of the release finger (rod) mmItemNominal diameter200200250250350350Assembling height deviation1.01.41.82.5End leaping amountDiaphragm spring clutch0.81.01.11.2Spiral spring clutch0.40.40.50.54.1.2 Release travel and release loadRelease travel and release load should meet with the requirements of the technical documents.4.1.3 Load characteristicThe load characteristic should meet with the requirements of the technical documents.4.1.4 LiftThe lift should meet with the requirements of the technical documents. 4.1.5 Pressure plate parallelismPressure plate parallelism should meet with the requirements of the technical documents.4.1.6 Unbalanced amountThe max. allowable unbalanced amount is 50M1(gmm). M1 is the mass of lid assembly in Kgs. When M1 is smaller than 3kg, the max. allowable unbalanced amount is 150gmm.4.2 The functional characteristic of the driven plate assembly4.2.1 Cushion resilienceCushion resilience should meet with the requirements of the technical documents.4.2.2 Thickness deviation and parallelismUnder specified work pressure load, the Thickness deviation and parallelism of the driven plate should meet with Table 2Table 2 Stipulated value for the thickness deviation and parallelism of the driven plate mmItemNominal diameter300300Thickness deviation0.300.35Parallelism0.20.25QC/T 25-20044.2.3 Torque shock absorbing characteristicTorque shock absorbing characteristic should meet with the requirements of the technical documents.4.2.4 Release drag torqueThe release drag torque should be no higher than whats stipulated in Table 3Table 3 Specified value of drag torqueNominal diameter: mmDrag torque, Nm2000.4200, 2500.525, 300.83501.24.2.5 Release drag travelUnder the condition of that the stipulated drag torque meets with the value in the Table 3, the release drag travel should be no higher than the min. stroke stipulated in the technical documents.4.2.6 Unbalanced amountThe max. allowable unbalanced amount is 120M2(gmm). M2 is the mass of lid assembly in Kgs. When M2 is smaller than 1.5kg, the max. allowable unbalanced amount is 180gmm.4.2.7 Sliding friction coefficientThe sliding friction coefficient of all kinds of clutch should meet with whats specified in Table 4Table 4 Specified Scope of Sliding Friction CoefficientTest periodMean value of sliding friction coefficientMin. value of sliding friction coefficient1. 60 clutch cycles0.260.242. When heat load of 320 (pressure plate temperature)(heat up with sliding friction)-0.213. When cooling down to the room temperature, clutch cycles for 1000 and 4000 times0.280.264.2.8 Abrasion Resistivity Feature4.2.8.1 After the 320 heat load test and clutch cycles for 1000 and 4000 times, no cracks, bubbles or rivet outcrop should occur on the surface of friction disk.4.2.8.2 After the 320 heat load test and clutch cycles for 1000 and 4000 times, the allowable abrasion of the friction disk should conform to whats specified in Table 5.Table 5 Allowable Abrasion of the Friction DiskNominal diameter: mmAllowable Abrasion: gAfter 1000 cyclesAfter 4000 cycles18028180-1902.28.8190-200312200-2103.514210-215416215-2304.518230Negotiation with the customersNegotiation with the customersQC/T 25-20044.2.9 Adhesion Resistive FeatureAfter test under the specified conditions, the release torque should meet with Table 6.Table 6 Specified Release TorqueNominal diameter: mmRelease torque, Nm19010190-21012210-24013240-28515285Negotiation with the customers4.3 Durability, reliability of the clutch4.3.1 Static release durability of the lid assemblyUnder the specified release travel, after times of durability test on the lid assembly, or under the specified intensified release travel, after times of durability test, the following should be met with:a) The max. release variance should be no higher than 15% of the beginning value;b) The pressure plate load should be no less than 90% of the beginning value for diaphragm spring clutch, no less than 80% for spiral spring clutch;c) Lift is no less than 90% of the beginning value;d) No invalidity of any components.4.3.2 Dynamic release durability of lid assemblyUnder the specified release travel, after 5105 times of durability test on the lid assembly, the following should be met with:a) The max. release variance should be no higher than 15% of the beginning value;b) The pressure plate load should be no less than 90% of the beginning value for diaphragm spring clutch, no less than 80% for spiral spring clutch;c) Lift is no less than 90% of the beginning value;d) The end abrasion of the release finger (rod) is no more than 30% of the beginning thickness.e) No invalidity of any components.4.3.3 Failure rotating speed of the clutch4.3.3.1 When the lid assembly is under the specified test condition, the failure rotating speed should no less than 1.8 times of the max. power speed of the engine.4.3.3.2 When the driven plate assembly is under the specified test condition, the failure rotating speed should no less than 1.6 times of the max. power speed of the engine.4.3.4 Cushion resilience durability of driven plate assemblyUnder the working pressure, after 2.5105 times of cushion resilience test on the driven plate:a) Cushion resilience should be no less than 80% of beginning value;b) There is no damage on the wave-shape disk and no loosen on rivet.4.3.5 Torque durability of driven plate assemblyAfter the driven plate has been through 5106 times test:a) Limit torque is no less than 80% of beginning value;b) The friction damp torque of the torque absorber should be no less than 60% of beginning value;c) No invalidity of any components.4.4 Other requirementQC/T 25-20044.4.1 The clutch should be clean, and no greasy dirt on the surface of the friction disks.4.4.2 All metal components of the clutch should be anti-corrosively treated, and anti-corrosive agent is allowed on the surface of the pressure plate.4.4.3 The special technical requirement other than whats specified in this standard is subject to the negotiation between the suppliers and the customers.4.4.4 The clutch should be kept in according to 7.4, and if rust occurs 6 months after leaving factory, the supplier should hold the responsibility; The clutch should be used as specified, and if damage occurs when the use life is no more than 1 year and driving no more than , the supplier should hold the responsibility.5 Test MethodsTest method is as per QC/T 27.6 Inspection rules6.1 Factory inspection6.1.1 The clutches should be checked to be conforming before being allowed to leave the factory.6.1.2 The items of factory inspection are as follows:a) Lid assembly load characteristic;b) Lid assembly release characteristic;c) The assembling height deviation of the release finger (rod) and the end leaping amount of the release finger (rod);d) The unbalance amount of the lid assembly; The drag torque or drag travel of the driven plate assembly;e) The drag torque or drag travel of the driven plate;f) Unbalance amount of the driven plate assemblyg) Work compressing thickness of the driven plate assemblyh) The torque shocking absorbing characteristic of the driven plate assembly;i) Visual Quality6.2 Style Test Model Test should be done under the following conditions:a) New products or old products produced in other factories;b) Big change in structure, engineering or materials, etc. and could impact product performance;c) Periodically checking should be made after a period of time or an accumulated product yields;d) Resume production after being stop production for a long period of time;e) Big variance of factory checking and the style checking done last time occur f) The requirement by the Quality Supervision Institute of the State6.2.2 Model test items:a) Durability test on lid assembly static release;b) Durability test on lid assembly dynamic release;c) High speed resistive test on lid assem