1、BRITISH STANDARDBS ISO 6117:2005Road 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; 83.140.50g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g
2、54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS ISO 6117:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 18 November 2005 BSI 18 November 2005ISBN 0 580 46517 9Nationa
3、l forewordThis 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 PRI/69, Components and fluids for vehicle braking systems, which has the responsibility to: A list of organizat
4、ions represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards 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
5、 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. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immu
6、nity 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, and keep UK interests informed; monitor related international and European developments and promulgate them in
7、the UK.Summary of pagesThis 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 notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAm
8、d. No. Date CommentsReference numberISO 6117:2005(E)INTERNATIONAL STANDARD ISO6117Second edition2005-06-15Road vehicles Elastomeric boots for drum-type, hydraulic brake wheel cylinders using a non-petroleum base hydraulic brake fluid (service temperature 100 C max.) Vhicules routiers Capuchons en ca
9、outchouc 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 iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS
10、O 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 technical committee has been established has the right to be represented on that committee. International organizations, gove
11、rnmental 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 of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC
12、Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International 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
13、 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 for identifying any or all such patent rights. ISO 6117 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcom
14、mittee 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 6117:2005blank1Road vehicles Elastomeric boots for drum-type, hydraulic brake wheel cylinders using a non-petroleum base hydraulic brake
15、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 cylinders; these boots are designed to prevent the entrance of dirt and moisture which could cause corrosion and otherwise imp
16、air 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. It does not include requirements relating to chemical composition, tensile strength or elongation at brake of the rubber compou
17、nd; 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 temperature range of 40 C to +100 C. 2 Normative references The following referenced documents are indispensable for the applicatio
18、n 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 IRHD and 100 IRHD) ISO 188:19
19、88, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests ISO 1431 (all parts), Rubber, vulcanized or thermoplastic Resistance to ozone cracking ISO 4925, Road vehicles Specification of non-petroleum-base brake fluids for hydraulic systems ISO 4926, Road vehicles Hydraulic
20、 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 base hydraulic brake fluid (Service temperature 120 C max.) 3 General requirements 3.1 Workmanship and finish The moulded boots
21、 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 drawings. BS ISO 6117:20052 3.2 Marking The identification mark of the manufacturer and other details as specified on the drawing
22、 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 Boots shall be packaged to meet requirements specified by the purchaser. 3.4 Sampling The minimum lot on which complete specific
23、ation 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 and the purchaser. 4 Test requirements 4.1 Resistance to fluid at elevated temperature After the boots has been subjected to the
24、 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 volume: 15 % to +15 %; change in hardness: 10 IRHD to +10 IRHD. 4.2 High temperature stroking performance After the high tempera
25、ture 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 Low temperature stroking performance During low temperature stroking as specified in 5.5, a boot shall not crack or separate
26、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, boots shall show no more than 75 % tension set. 4.5 Heat resistance performance (static) After the heat resistance test as detai
27、led 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 shall be within the limits 5 IRHD to +10 IRHD; c) no tackiness shall be evident after removal from the oven. BS ISO 6117:20053
28、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 magnification. The surfaces of the test specimens shall show no evidence of cracking, rupture or other deterioration. 5 Test procedu
29、res 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 accordance with ISO 48. 5.2 Determination of hardness The method of determining rubber hardness shall be as described in ISO 48. Test e
30、ach 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 manufacturer and purchaser may be substituted. In this case, correlation of the results obtained shall be made to IRHD as in ISO 48. 5.3 Re
31、sistance 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 jar, having a capacity of approximately 250 ml and inner dimensions of approximately 125 mm in height and 50 mm in diameter, an
32、d 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 The brake fluid used for the test shall be the compatibility fluid in accordance with ISO 4926. 5.3.4 Procedure Rinse the speci
33、mens 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 alcohol for more than 30 s. Determine and record the initial hardness of the test specimens (see 5.2). Determine the volume of each sp
34、ecimen in the following manner: Weigh each specimen in air (m1) to the nearest 0,001 g and then weigh the specimen immersed in distilled water at room temperature (m2). Quickly dip each specimen in alcohol and then wipe dry with a clean, lint-free cloth. Immerse two specimens completely in 75 ml of
35、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 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 m
36、in 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 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
37、 specimen in a separate, tarred, stoppered weighing bottle and weigh (m3). Remove each specimen and weigh it immersed in distilled water (m4) to determine water displacement after hot fluid immersion. Determine the final volume and hardness of each specimen within 60 min after rinsing in alcohol. 5.
38、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: ( ) ( )()34 1212100mm mmmmwhere m1is the initial mass, in grams, in air; m2is the initial apparent mass, in grams, in water; m3is the mas
39、s, 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 be determined and recorded. 5.3.5.3 The specimens shall be examined for disintegration as evidenced by blisters or sloughing (carbon black). 5
40、.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 4928:1980, 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 t
41、he 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 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 actu
42、ation 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 6117:200555.5 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,
43、 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 removal 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
44、 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 the sample wheel cylinder boots on the cylinder for which they are designed, or equivalent. Place the test boots and test apparatus in the cold ch
45、amber (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 stroking 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
46、 Apparatus 5.6.1.1 Circular stretching mandrels, having a diameter which will expand by 0315% one or the other of the sealing ends attached to the wheel cylinder or to the actuating rod. The mandrel diameter (d3) is calculated as 115 % of the moulded diameter of the chosen boot end. The moulded diam
47、eter shall be calculated from the average of two measurements made at right angles to one another on a contour projector. The mandrel shall be provided 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 Circulatin
48、g 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 accurately and record the inside diameter (d1) of the ends of three specimen boots. Assemble on the stretching mandrels (5.6.1.1). Place the assemblies in t
49、he 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 for between 30 min and 1 h. Again measure and record the diameter (d2). 5.6.3.2 The tension set as a percentage of the original stretch deflection is given by the formula: 2131100ddddBS ISO 6117:20056 where d1is the unaged inside diameter, in millimetres, of the boot; d2is the aged inside diameter, in millimetres, of the boot; d3is the diameter, in
