1、9009276 0028567 525 W Designation:D 3428-86 4cni AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race St.,Philadelphia,Pa.19103 Reprinted from lhe Annual Book of ASTM Standards.Copyright ASTM If no1 listed in the current combined index,will appear in the next edition.Standard Test Method for TORQUE
2、STABILITY,WEAR,AND BRINE SENSITIVITY EVALUATION OF BALL JOINT GREASES This standard is issued under the fixed designation D 3428 the number immediately following the desisnation indicae the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicat
3、es the year of last reapproval.A superscript epsilon(e)indicae an editorial change since the last revision or reapproval.1.Scope 1.1 This test method covers two procedures for evaluating the suitability of greases for use in automotive chassis ball joints.1.2 The Torque Stability Test provides a mea
4、-sure of the frictional and antiwear properties of greases when subjected to load and prolonged working under oscillating motions in bal!joints.i.3 The Brine Sensitivity Test provides a mea-sure of the ability of the grease to prevent noise from an oscillating ball joint when exposed to contaminatio
5、n by brine.1.4 The values stated in inch-pound units are to be regarded as the standard.1.5 This standard may involve hazardous ma-terials,operations,and equipment.This standard does not purport to address all of the safetyprob-lems associated with its use.It is the responsibil-ity of the user of th
6、is standard to establish appro-priate safety and health practices and determine the applicability ofregulatory limitations prior to use.For specific hazard statements,see Notes I,2,and 3.2.Referenced Documents 2.1 ASTM Standards:D235 Specification for Mineral Spirits(Petro-leum Spirits)Hydrocarbon D
7、rycleaning Sol-vent2 D 329 Specification for Acetone3 3.Summary of Test Method 3.1 A lubricated automotive ball joint stud and bearing,confined in a fixed housing,is rocked through an arc under prescribed condi-tions of rocking frequency,rocking amplitude,load and time.Noise,wear,and torque are ob-s
8、erved or recorded,or both.I,4.Significance and Use 4.i Both procedures are intended as screening tests to aid in the selection of greases for the lubrication of automotive chassis ball joints.Since both the test components and procedures approximate those typical of current equipment and operation,r
9、espectively,test results are con-sidered to provide a measure of grease suitability.Neither procedure,however,is intended as a measure of long-time service under actual con-ditions of operation.5.Apparatus 5.I Ball Joint Grease Tester-A niechanical unit4 for a single ball joint but equipped with com
10、ponents for variable speed and adjustable rocking amplitude is shown in Fig.I.A teste9 for two ball joints but with fixed speed and rocking amplitude is shown in Fig.2.The me-chanical unit shown in Fig.l consists of the following components:5.1.1 A power system comprised of an electric motor(A)which
11、 drives a speed reducer(B)through a variable pitch pulley(C)and belt ar-rangement.5.1.2 An eccentric drive(D)driven directly off This test method is under the jurisdiction of A!SM Com-mittee D 2 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee W2.G on Lubricating
12、 G r e a s e.Current edition approvedOct.31,1975.Published December 1986.Onginally published as D 3428-75.Last previous edition D 3428-75.Annual Bwk o f ASTM Siandards,Vol 05.0 1.Annual Bwk o f ASTM Siandards Vol 05.03.Drawings for a single ball joint mechanical unit areavailable from Research Labor
13、atories,General Motors Corp.W a r r e n,Mi.48090.A complete tester with instrumentation for two ball joints is manufactured by O.P.Schuman and Sons,Inc.,County Lime and Titus Road,Waningcon,PA.18976.1 NOTICE:This standard has either been superseded and replaced by a new version or discontinued.Conta
14、ct ASTM International(www.astm.org)for the latest information.m 900927b 0028568 4 b l =the speed reducer(B)is connected to the rocker assembly(E).5.1.3 The ball joint housing(F)is fastened in the ball joint holder(G).The stud of the ball joint is held securely in the rocker assembly(E).5.I.4 An air-
15、operated load cylinder(H),con-nected to the bottom of the ball joint holder(G),is used to apply the desired load to the ball joint(FI.5.2 Rocking Assembly-Figure 3 shows a cross section view of the rocker assembly(E),ball joint(F),ball joint holder(G),and load cylinder(H).The height adjuster(I)is us
16、ed to position the center of oscillation of the ball joint bearing on the center line of the pivot bearings.This position is maintained by lock nut(J)and socket head cap screws located in the face of rocker assembly(E).Strain gages(K)are mounted on the strain members(L).5.3 Ball Joint Holder-Figure 4 is a view of the ball joint holder(See G,Fig.1)rotated 90 deg.Construction of this unit,the strain mem-bers(t),and strain gages(K)are more clearly defined here.5.4 Bali Joint-A tension-type automoti
