1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58cylinders using a non-petroleum base hydraulic brake fluid (Service temperature 150 C max.)ICS 43.0
2、40.40; 83.140.50Road vehicles Elastomeric seals for hydraulic disc brake BRITISH STANDARDBS ISO 4930:2006BS ISO 4930:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2006 BSI 2006ISBN 0 580 48706 7Cross-referencesThe British Standa
3、rds which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication d
4、oes not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO
5、 title page, pages ii to iv, pages 1 to 10, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obta
6、ined on request to its secretary. present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis Brit
7、ish Standard reproduces verbatim ISO 4930:2006 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PRI/69, Components and fluids for vehicle braking systems, which has the responsibility to: aid enquirers to understand the text;
8、Reference numberISO 4930:2006(E)INTERNATIONAL STANDARD ISO4930Second edition2006-07-15Road vehicles Elastomeric seals for hydraulic disc brake cylinders using a non-petroleum base hydraulic brake fluid (Service temperature 150 C max.) Vhicules routiers Joints en caoutchouc pour cylindres de freins h
9、ydrauliques disque utilisant un liquide de frein base non ptrolire (Temprature maximale dutilisation 150 C) BS ISO 4930:2006ii iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Product requirements. 1 4 Brake test fluid 1 5 Apparatus 2 5.1 Apparatus for test of resistance to flui
10、d at elevated temperature, physical stability and precipitation characteristics 2 5.2 Apparatus for high-temperature stroking test (see Figure 1) . 2 5.3 Apparatus for low-temperature leakage test (see Figure 2) 3 6 Test requirements. 3 7 Preparation of test specimens 4 8 Resistance to fluid at elev
11、ated temperature 4 8.1 Test specimens . 4 8.2 Test procedure 5 9 Resistance to fluid at elevated temperature Precipitation characteristics 5 9.1 Test specimens . 5 9.2 Test procedure 5 10 Resistance to elevated temperature in dry air.6 10.1 Test specimens . 6 10.2 Test procedure 6 11 Ambient-tempera
12、ture stroking test. 6 11.1 Test specimens . 6 11.2 Test procedure 6 12 High-temperature stroking test . 7 12.1 Test specimens . 7 12.2 Test procedure 7 13 Low-temperature leakage test . 8 13.1 Test specimens . 8 13.2 Test procedure 8 13.3 Bent test procedure 9 14 Cycling humidity storage corrosion t
13、est 9 14.1 Test specimens . 9 14.2 Test procedure 9 BS ISO 4930:2006iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO techn
14、ical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
15、with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft In
16、ternational Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document
17、may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 4930 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 2, Braking systems and equipment. This second edition cancels and replaces the first edition (I
18、SO 4930:1978), which has been technically revised. BS ISO 4930:20061Road vehicles Elastomeric seals for hydraulic disc brake cylinders using a non-petroleum base hydraulic brake fluid (Service temperature 150 C max.) 1 Scope This International Standard specifies the performance test methods and requ
19、irements for elastomeric seals used in road vehicle disc brake cylinders. It is applicable to solid section type seals (square, rectangular, “O”-ring), mounted stationary in the cylinder bore or on the movable piston of disc brakes. 2 Normative references The following referenced documents are indis
20、pensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IR
21、HD and 100 IRHD) ISO 188, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests ISO 1817, Rubber, vulcanized Determination of the effect of liquids ISO 4926, Road vehicles Hydraulic brake systems Non-petroleum base reference fluids ISO 4928, Road vehicles Elastomeric cups
22、and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid (Service temperature 120 C max.) 3 Product requirements Seals shall conform to the pertinent drawing in all respects, and shall be free from blisters, pin-holes, cracks, protuberances, embedded for
23、eign material, or other physical defects which can be detected by thorough inspection. These elastomeric seals shall be suitable for operation in a temperature range of 40 C to +150 C. 4 Brake test fluid The test fluid for all tests except the test specified in Clause 14 shall be compatibility fluid
24、 as defined in ISO 4926. The fluid specified in Clause 14 shall be ISO fluid for storage corrosion test as defined in ISO 4926 or the fluid agreed by the parties concerned. BS ISO 4930:20062 5 Apparatus 5.1 Apparatus for test of resistance to fluid at elevated temperature, physical stability and pre
25、cipitation characteristics 5.1.1 Oven, uniformly heated, dry air type conforming to the requirements of ISO 188. 5.1.2 Test jar, screw-top straight-sided round glass type, having a capacity of approximately 250 ml and inner dimensions of approximately 125 mm height and 50 mm diameter, with a tinned
26、steel lid (no insert or organic coating). 5.2 Apparatus for high-temperature stroking test (see Figure 1) 5.2.1 Pneumatic or hydraulic pressure source. 5.2.2 Master cylinder. 5.2.3 Pressure gauge. 5.2.4 Wheel cylinder seat stroking fixture. 5.2.5 Cylinder assembly. 5.2.6 Oven, in accordance with 5.1
27、.1. Key 1 pneumatic or hydraulic pressure source 2 master cylinder 3 pressure gauge 4 wheel cylinder seal stroking fixture 5 oven chamber at +120 C 6 cylinder assembly Figure 1 High-temperature stroking test BS ISO 4930:200635.3 Apparatus for low-temperature leakage test (see Figure 2) 5.3.1 Hydraul
28、ic pressure gauge. 5.3.2 Master cylinder. 5.3.3 Cylinder assembly. 5.3.4 Cold chamber, at 40 C. Dimensions in millimetres Key 1 hydraulic pressure gauge 2 master cylinder 3 cylinder assembly 4 cold chamber at 40 C Figure 2 Low-temperature leakage test 6 Test requirements 6.1 After the test for resis
29、tance to fluid at elevated temperature (physical stability) (see Clause 8), the seals shall conform to the following requirements: a) any change in volume shall be within 0 % to +15 %; b) any change in hardness shall be within 0 IRDH to 15 IRHD. 6.2 After the test for resistance to fluid at elevated
30、 temperature (precipitation characteristics) (see Clause 9), not more than 0,3 % sediment by volume shall be formed in the test fluid used. BS ISO 4930:20064 6.3 After the test for resistance to elevated temperature in dry air (see Clause 10), the seals shall conform to the following requirements: a
31、) any change in hardness shall be within 0 IRDH to +15 IRHD; b) seal condition: test specimens shall show no evidence of blistering, cracking, or change in shape from the original form. 6.4 After the ambient temperature stroking test (see Clause 11), seals and assembly shall conform to the following
32、 requirements: a) no leakage beyond normal wetting of the bore(s) shall occur during the stroking test; b) no leakage beyond normal wetting of the bore(s) shall occur during the static leak test (see 11.2.3). 6.5 After the high temperature stroking test (see Clause 12), the seals and assembly shall
33、conform to the following requirements: a) no leakage beyond normal wetting of the bore(s) shall occur during the stroking test; b) no leakage beyond normal wetting of the bore(s) shall occur during the static leak test (see 12.2.4). 6.6 After the low temperature leakage test (see Clause 13), the sea
34、ls and assembly shall conform to the following requirements: a) no leakage beyond normal wetting of the bore(s) shall occur during the test period or pressure application; b) the seal shall not crack, shall remain flexible and shall return to its approximate original shape within 1 min when tested a
35、ccording to the procedure specified in 13.3. 6.7 After the cycling humidity storage corrosion test (Clause 14), the seals and assembly shall conform to the following requirements: a) no evidence of rubber adhesion of the test seal(s) shall appear during disassembly of the test brake; b) no surface o
36、f the sealing systems shall show evidence of corrosion or deterioration which would interfere with proper sealing action; normal staining or discoloration of metal parts is acceptable if surface finish is unaffected. 6.8 After all tests, disassemble the cylinder and inspect the seal. Record the visu
37、al condition of the seal bore and piston. Seals shall not show excessive deterioration such as scoring, scuffing, blistering, cracking, or change in shape from original appearance. 7 Preparation of test specimens All seals to be tested shall be cleaned prior to testing by rinsing in isopropanol then
38、 blown dry or wiped dry with a lint-free cloth. Seals shall not remain in the alcohol for more than 30 s. 8 Resistance to fluid at elevated temperature 8.1 Test specimens From three or more seals to be tested, obtain a sample of mass 3 g to 5 g. BS ISO 4930:200658.2 Test procedure 8.2.1 Determine an
39、d record the initial volume of the sample in accordance with ISO 1817. 8.2.2 Determine and record the initial hardness of the sample in IRHD. Measure the hardness as specified in ISO 48 using a microtester (or according to a procedure previously agreed upon between the vendor and purchaser). 8.2.3 P
40、lace the sample in the test jar (5.1.2) and completely immerse in 75 ml of brake test fluid (see Clause 4). Seal the test jar to prevent vapour loss and place in the oven (5.1.1) at 150 C 2 C for 70 h. 8.2.4 After the 70 h, remove the sample from the oven and allow to cool in the container at 23 C 5
41、 C for 60 min to 90 min. At the end of the cooling period, remove the sample from the container and rinse in isopropanol or ethanol then wipe dry with a clean, lint-free cloth. Do not allow the sample to remain in the alcohol for more than 30 s. 8.2.5 Within 60 min of removal from the liquid, determ
42、ine and record the final volume and hardness, in IRHD, of each seal in accordance with 8.2.1 and 8.2.2. Average the results and report as the change in volume and hardness. 8.2.6 Report the change in volume, V, as a percentage of the original volume. It is given by the formula: ()( )()34 1212100 %mm
43、 mmVmm= where m1is the initial mass, in grams, in air; m2is the initial apparent mass, in grams, in water; m3is the mass, in grams, in air after immersion in the test fluid; m4is the apparent mass, in grams, in water after immersion in the test fluid. 9 Resistance to fluid at elevated temperature Pr
44、ecipitation characteristics 9.1 Test specimens From two or more seals to be tested, obtain a sample of 4,0 g 0,5 g. Since whole seals are quite large, small pieces may be cut from the seal to arrive at the required mass. Use a minimum number of pieces to obtain a sample of mass 4,0 g 0,5 g. 9.2 Test
45、 procedure 9.2.1 Place the sample in a test jar (5.1.2) and cover it with 75 ml of the test fluid (see Clause 4). Seal the test jar to prevent vapour loss and place in the oven (5.1.1) at 150 C 2 C. (Optional: a blank test may be conducted on the brake fluid prior to the test, and any sediment resul
46、ting from this blank test may be deducted from the volume of sediment obtained after the test.) 9.2.2 After 70 h, remove the test jar from the oven. Allow the sample to remain in the fluid at room temperature for 24 h, after which agitate the test fluid and pour into a cone-shaped centrifuge tube of
47、 100 ml capacity. BS ISO 4930:20066 9.2.3 Rotate the centrifuge tube for 30 min at 1 500 min1. Note the volume of sediment observed in the tube. Repeat the above rotation for an additional 30 min and record any difference in the volume of sediment. 9.2.4 Record the percentage amount of sediment obta
48、ined after the second centrifuging. 10 Resistance to elevated temperature in dry air 10.1 Test specimens Two or more seals shall be used. 10.2 Test procedure 10.2.1 Measure and record the hardness of each seal in IRHD in accordance with 8.2.2. 10.2.2 Place the test seals in a circulating air oven, a
49、s specified in ISO 188, and maintain at 150 C 2 C for 70 h. 10.2.3 At the termination of the heating period, remove the seals from the oven and allow to cool for 16 h to 96 h at room temperature. 10.2.4 After cooling, measure and record the hardness in IRHD, in accordance with 8.2.2, and note any visual change such as cracking, blistering or distortion. 11 Ambient-temperature stroking test 11.1 Test specimens An adequate number of test seals for at least one complete callip
