1、BRITISH STANDARD BS ISO 6117:2005 Road vehicles Elastomeric boots for drum-type, hydraulic brake wheel cylinders using a non-petroleum base hydraulic brake fluid (service temperature 100 C max.) ICS 43.040.40; 83.140.50 BS ISO 6117:2005 This British Standard was published under the authority of the
2、Standards Policy and Strategy Committee on 18 November 2005 BSI 18 November 2005 ISBN 0 580 46517 9 National foreword This British Standard reproduces verbatim ISO 6117:2005 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PR
3、I/69, Components and fluids for vehicle braking systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document
4、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 does not purport to include all the necessary provisions of a contract. User
5、s are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change,
6、 and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 7 and a back cover. The BSI copyright
7、notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 6117:2005(E)INTERNATIONAL STANDARD ISO 6117 Second edition 2005-06-15 Road vehicles Elastomeric boots for drum-type, hydraulic brake wheel cy
8、linders using a non-petroleum base hydraulic brake fluid (service temperature 100 C max.) Vhicules routiers Capuchons en caoutchouc pour cylindres de roue pour freins hydrauliques tambour utilisant un liquide de frein base non ptrolire (temprature maximale dutilisation 100 C) BS ISO 6117:2005ii iii
9、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 technical committees. Each member body interested in a subject for which a t
10、echnical 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 with the International Electrotechnical Commission (IEC) on all matters
11、 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 International Standards adopted by the technical committees are circulate
12、d 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 may be the subject of patent rights. ISO shall not be held responsible
13、for identifying any or all such patent rights. ISO 6117 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 (ISO 6117:1980), which has been technically revised. BS ISO 6117:2005blan
14、k 1 Road vehicles Elastomeric boots for drum-type, hydraulic brake wheel cylinders using a non-petroleum base hydraulic brake fluid (service temperature 100 C max.) 1 Scope This International Standard specifies performance tests for moulded rubber boots used at end closures on drum-type wheel brake
15、cylinders; these boots are designed to prevent the entrance of dirt and moisture which could cause corrosion and otherwise impair wheel brake operation. It is applicable to boots of both plain and reinforcement insert types, for fitting in wheel cylinders using a fluid in accordance with ISO 4925. I
16、t does not include requirements relating to chemical composition, tensile strength or elongation at brake of the rubber compound; it does not cover the strength of adhesion of rubber to the reinforcement in the insert type. The rubber material used in these boots is suitable for operation in a tempe
17、rature range of 40 C to +100 C. 2 Normative references The following referenced documents are indispensable 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) app
18、lies. ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 188:1988, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests ISO 1431 (all parts), Rubber, vulcanized or thermoplastic Resistance to ozone cracking IS
19、O 4925, Road vehicles Specification of non-petroleum-base brake fluids for hydraulic systems ISO 4926, Road vehicles Hydraulic brake systems Non-petroleum base reference fluids ISO 4928:1980, Road vehicles Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum b
20、ase hydraulic brake fluid (Service temperature 120 C max.) 3 General requirements 3.1 Workmanship and finish The moulded boots shall be free from blisters, pin-holes, cracks, protuberances, embedded foreign material, or other physical defects, and shall conform to the dimensions specified on the dra
21、wings. BS ISO 6117:20052 3.2 Marking The identification mark of the manufacturer and other details as specified on the drawing shall be moulded into each boot where design permits. Each boot in conformity with this International Standard may also have the following mark: “ISO 6117”. 3.3 Packaging Bo
22、ots shall be packaged to meet requirements specified by the purchaser. 3.4 Sampling The minimum lot on which complete specification tests shall be conducted for quality control testing, or the frequency of any specific type test used to control production, shall be agreed upon by the manufacturer an
23、d the purchaser. 4 Test requirements 4.1 Resistance to fluid at elevated temperature After the boots has been subjected to the test for resistance to fluid at elevated temperature as prescribed in 5.3, the change in volume and the change in hardness shall be within the following limits: change in vo
24、lume: 15 % to +15 %; change in hardness: 10 IRHD to +10 IRHD. 4.2 High temperature stroking performance After the high temperature stroking as specified in 5.4, a boot shall be free of flexure cracks which extend through the wall thickness, and shall fit tightly around the cylinder and push rod. 4.3
25、 Low temperature stroking performance During low temperature stroking as specified in 5.5, a boot shall not crack or separate from its assembled position on the cylinder or become loose on the push rod. 4.4 Tension set performance After being subjected to the tension set test as specified in 5.6, bo
26、ots shall show no more than 75 % tension set. 4.5 Heat resistance performance (static) After the heat resistance test as detailed in 5.7, a boot shall conform to the following requirements: a) no cracking shall occur when the boot is flexed similarly to service conditions; b) the change in hardness
27、shall be within the limits 5 IRHD to +10 IRHD; c) no tackiness shall be evident after removal from the oven. BS ISO 6117:2005 3 4.6 Ozone resistance performance At the end of the 70 h exposure period as detailed in 5.8, test specimens shall be removed from the ozone chamber and examined under 2 magn
28、ification. The surfaces of the test specimens shall show no evidence of cracking, rupture or other deterioration. 5 Test procedures 5.1 Test specimens Specimens prepared for all tests shall be cut from the same general area of sample. In addition, hardness test specimens shall be prepared in accorda
29、nce with ISO 48. 5.2 Determination of hardness The method of determining rubber hardness shall be as described in ISO 48. Test each specimen submitted; record the range of IRHD. When the shape of the boot prevents using the method described in ISO 48, an alternative method agreed between manufacture
30、r and purchaser may be substituted. In this case, correlation of the results obtained shall be made to IRHD as in ISO 48. 5.3 Resistance to fluids at elevated temperature 5.3.1 Apparatus 5.3.1.1 Circulating air oven in accordance with ISO 188:1998, 4.1. 5.3.1.2 Screw-top, straight-sided, round glass
31、 jar, having a capacity of approximately 250 ml and inner dimensions of approximately 125 mm in height and 50 mm in diameter, and a tinned steel lid (no insert or organic coating). 5.3.2 Test specimens A section weighting approximately 3 g to 5 g shall be cut from each of two boots. 5.3.3 Test fluid
32、 The brake fluid used for the test shall be the compatibility fluid in accordance with ISO 4926. 5.3.4 Procedure Rinse the specimens in isopropyl alcohol or its equivalent and wipe dry with a clean, lint-free cloth to remove dirt and packing debris. Do not allow the specimens to remain in the alcoho
33、l for more than 30 s. Determine and record the initial hardness of the test specimens (see 5.2). Determine the volume of each specimen in the following manner: Weigh each specimen in air (m 1 ) to the nearest 0,001 g and then weigh the specimen immersed in distilled water at room temperature (m 2 ).
34、 Quickly dip each specimen in alcohol and then wipe dry with a clean, lint-free cloth. Immerse two specimens completely in 75 ml of the test fluid in the glass jar and tightly cap the jar. BS ISO 6117:20054 Place the jar containing the specimens in the oven (5.3.1.1) at 100 C 2 C for a period of 70
35、h 2 h. At the end of the heating period, remove the jar containing the specimen from the oven and allow to cool to 23 C 5 C for 60 min to 90 min. At the end of the cooling period, remove the specimens from the jar and rinse in isopropyl alcohol or its equivalent and wipe dry with a clean, lint-free
36、cloth. Do not allow the specimens to remain in the alcohol for more than 30 s. After removal from the alcohol and drying, place each specimen in a separate, tarred, stoppered weighing bottle and weigh (m 3 ). Remove each specimen and weigh it immersed in distilled water (m 4 ) to determine water dis
37、placement after hot fluid immersion. Determine the final volume and hardness of each specimen within 60 min after rinsing in alcohol. 5.3.5 Expression of results 5.3.5.1 Volume change shall be reported as a percentage of the original volume. The percentage change in volume is given by the formula: (
38、 ) ( ) () 3412 12 100 mmmm mm where m 1is the initial mass, in grams, in air; m2is the initial apparent mass, in grams, in water; m 3is the mass, in grams, in air after immersion in test fluid; m4is the apparent mass, in grams, in water after immersion in test fluid. 5.3.5.2 Change in hardness shall
39、 be determined and recorded. 5.3.5.3 The specimens shall be examined for disintegration as evidenced by blisters or sloughing (carbon black). 5.4 High temperature stroking test 5.4.1 Apparatus 5.4.1.1 Circulating air oven as specified in ISO 188:1998, 4.1. 5.4.1.2 Stroking fixtures as shown in ISO 4
40、928:1980, Figure 1. 5.4.2 Test specimen Two boots shall be used as test specimens. 5.4.3 Procedure Install two sample wheel cylinder boots on the cylinder for which they are designed, or equivalent. Then mount the cylinder in the actuator assembly, set to operate at (1 000 100) strokes per hour with
41、 a stroke length of 4,8 mm 0,5 mm. Then place the cylinder assembly in the oven (5.4.1.1) and actuate for 70 h 2 h at 100 C 2 C. After the actuation of the assembly, remove it from the oven, allow to cool to room temperature, and examine the boots for flexure cracks and general appearance. BS ISO 61
42、17:2005 5 5.5 Low temperature stroking test 5.5.1 Apparatus 5.5.1.1 Cold chamber, in which the test specimens are exposed to the low temperature, of sufficient size to contain the apparatus assembled with test specimens, and so arranged as to permit the operator to check and operate it without remov
43、al from the chamber. It shall be capable of maintaining a uniform atmosphere of cold dry air within the specified temperature range of 40 C to 43 C. 5.5.1.2 Stroking fixtures as shown in ISO 4928:1980, Figure 1. 5.5.2 Test specimen Two boots shall be used as test specimens. 5.5.3 Procedure Install t
44、he sample wheel cylinder boots on the cylinder for which they are designed, or equivalent. Place the test boots and test apparatus in the cold chamber (see 5.5.1.1) and expose them to temperature of 40 C to 43 C for 22 h 1 h. After 22 h 1 h of low temperature exposure, stroke the boots with the stro
45、king apparatus for six strokes with length 4,8 mm 0,5 mm, at intervals of 30 s, without removal from the cold chamber. 5.6 Tension set test 5.6.1 Apparatus 5.6.1.1 Circular stretching mandrels, having a diameter which will expand by 0 3 15 % one or the other of the sealing ends attached to the wheel
46、 cylinder or to the actuating rod. The mandrel diameter (d 3 ) is calculated as 115 % of the moulded diameter of the chosen boot end. The moulded diameter shall be calculated from the average of two measurements made at right angles to one another on a contour projector. The mandrel shall be provide
47、d with a smooth lead-in chamfer to prevent cutting of the rubber and shall itself have a polished machine finished (16 Ra maximum). 5.6.1.2 Circulating air oven as specified in ISO 188:1998, 4.1. 5.6.2 Test specimens Three boots shall be used as test specimens. 5.6.3 Procedure 5.6.3.1 Measure accura
48、tely and record the inside diameter (d 1 ) of the ends of three specimen boots. Assemble on the stretching mandrels (5.6.1.1). Place the assemblies in the oven (5.6.1.2) and age for 70 h 2 h at 100 C 2 C. Remove the assemblies and cool at room temperature for 1 h. Remove the boots. Allow to recover
49、for between 30 min and 1 h. Again measure and record the diameter (d 2 ). 5.6.3.2 The tension set as a percentage of the original stretch deflection is given by the formula: 21 31 100 dd dd BS ISO 6117:20056 where d 1is the unaged inside diameter, in millimetres, of the boot; d 2is the aged inside diameter, in millimetres, of the boot; d 3is the diameter, in millimetres, of the
