1、 Reference number ISO/TS 20825:2003(E) ISO 2003TECHNICAL SPECIFICATION ISO/TS 20825 First edition 2003-03-15 Road vehicles Drawbar couplings, drawbar eyes, fifth wheel kingpins, hook couplings and toroidal eyes Wear limits for in-use mechanical couplings Vhicules routiers Chapes dattelage, anneaux d
2、e remorquage, pivots dattelage, attelages crochet et anneaux de timon toriques Limites dusure pour les dispositifs dattelage mcaniques en service ISO/TS 20825:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or
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7、yrightiso.org Web www.iso.org Published in Switzerland ii ISO 2003 All rights reservedISO/TS 20825:2003(E) ISO 2003 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 Checking worn components 2 3.1 40 mm and 50 mm drawbar couplings 2 3.2 40 mm and
8、50 mm drawbar eyes. 2 3.3 50 mm and 90 mm fifth wheel kingpins 4 3.4 Hook couplings . 4 3.5 Toroidal eyes . 4 4 Limit dimensions for worn components. 5 4.1 40 mm drawbar couplings and eyes . 5 4.2 50 mm drawbar couplings and eyes . 6 4.3 50 mm fifth wheel kingpins 6 4.4 90 mm fifth wheel kingpins 7
9、4.5 Hook couplings and toroidal eyes 7 ISO/TS 20825:2003(E) iv ISO 2003 All rights reservedForeword 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 o
10、ut 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, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO c
11、ollaborates 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 Directives, Part 2. The main task of technical committees is to prepare International
12、 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 bodies casting a vote. In other circumstances, particularly when there is an urgent
13、market requirement for such documents, a technical committee may decide to publish other types of normative document: an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an ISO working group and is accepted for publication if it is approved by more
14、than 50 % of the members of the parent committee casting a vote; an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a vote. An ISO/PAS or ISO/TS
15、is reviewed after three years in order to decide whether it will be confirmed for a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is confirmed, it is reviewed again after a further three years, at which time it must either be transformed int
16、o an International Standard or be withdrawn. 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/TS 20825 was prepared by Technical Committee ISO/TC
17、22, Road vehicles, Subcommittee SC 15, Interchangeability of components of commercial vehicles and buses. ISO/TS 20825:2003(E) ISO 2003 All rights reserved vIntroduction This Technical Specification is intended to provide limits to the wear of standardized mechanical couplings mounted on heavy comme
18、rcial vehicles, in order to ensure their safe on-road operation. This Technical Specification has been considered necessary because the lack of any compulsory requirement applicable to the allowable wear of mechanical couplings has meant that the competent authorities, when checking in-use vehicles,
19、 make reference only to the design dimensions of standardized mechanical couplings. Nor have they been taking into consideration the wear limits indicated by each mechanical coupling manufacturer on the instructions for use and maintenance of the coupling. This Technical Specification is addressed t
20、o all parties involved in the safe use of heavy commercial vehicles, i.e. the owner, any competent person who conducts the periodical maintenance and the competent authorities conducting the periodical inspection and check of in-use vehicles. TECHNICAL SPECIFICATION ISO/TS 20825:2003(E) ISO 2003 All
21、 rights reserved 1Road vehicles Drawbar couplings, drawbar eyes, fifth wheel kingpins, hook couplings and toroidal eyes Wear limits for in-use mechanical couplings 1 Scope This Technical Specification specifies the maximum allowable wear and the limit dimensions of worn components of in-use mechanic
22、al couplings, which, when respected, will ensure the safe operation on the road of heavy commercial vehicles fitted with such couplings. It is applicable to the following standardized mechanical couplings: 40 mm and 50 mm drawbar couplings (see ISO 3584); 40 mm and 50 mm drawbar eyes (see ISO 8755 a
23、nd ISO 1102); 50 mm and 90 mm fifth wheel kingpins (see ISO 337 and ISO 4086); hook couplings and toroidal eyes (see ECE Regulation No. 55). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited
24、applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 337:1981, Road vehicles 50 semi-trailer fifth wheel coupling pin Basic and mounting/ interchangeability dimensions ISO 1102:2001, Commercial road vehicles 50 mm drawbar eye Intercha
25、ngeability ISO 3584:2001, Road vehicles Drawbar couplings Interchangeability ISO 4086:2001, Road vehicles 90 semi-trailer fifth wheel kingpin Interchangeability ISO 8755:2001, Commercial road vehicles 40 mm drawbar eye Interchangeability ECE Regulation No. 55, Revision 1:2001, Uniform Provisions Con
26、cerning the Approval of Mechanical Coupling Components of Combinations of Vehicles ISO/TS 20825:2003(E) 2 ISO 2003 All rights reserved3 Checking worn components 3.1 40 mm and 50 mm drawbar couplings 3.1.1 During normal operation, mechanical contact between the drawbar coupling pin and the drawbar ey
27、e bush generates wear of the pin surface. It is generally noted that this results in an elliptical section of the pin on the horizontal symmetry plane, the minimum dimension being in the longitudinal axis direction (Figure 1 shows the dimension to be checked). 3.1.2 Check worn coupling pins either b
28、y direct measurement or using special gauges. Key 1 dimension to be checked Figure 1 Dimension to be checked on 40 mm and 50 mm drawbar couplings 3.2 40 mm and 50 mm drawbar eyes 3.2.1 During normal operation, mechanical contact between the drawbar eye bush and the drawbar coupling pin generates wea
29、r of the bush surface. It is generally noted that this results in an elliptical section of the bush on the horizontal symmetry plane, the maximum dimension being in the longitudinal axis direction (Figures 2 and 3 show the dimension to be checked). 3.2.2 During normal operation, mechanical contact b
30、etween the drawbar eye and the drawbar coupling jaw generates wear of the upper and lower surfaces of the drawbar eye. It is generally noted that this results in a reduced drawbar eye thickness on both sides of the eye centre. This may lead to the sleeve moving away from its normal working position
31、(Figures 2 and 3 show the dimension to be checked). 3.2.3 Check worn drawbar eyes either by direct measurement or using special gauges. 3.2.4 Check the thickness of drawbar eyes on each side of the longitudinal median plane. ISO/TS 20825:2003(E) ISO 2003 All rights reserved 3Key 1 dimension to be ch
32、ecked, eye bush 2 dimension to be checked, thickness Figure 2 Dimensions to be checked on 40 mm drawbar eyes Key 1 dimension to be checked, eye bush 2 dimension to be checked, thickness Figure 3 Dimensions to be checked on 50 mm drawbar eyes ISO/TS 20825:2003(E) 4 ISO 2003 All rights reserved3.3 50
33、mm and 90 mm fifth wheel kingpins 3.3.1 During normal operation, mechanical contact between the kingpin and the fifth wheel locking jaw generates wear of the kingpin. It is generally noted that this results in an elliptical section of the kingpin, in its two upper cylinders, on the horizontal symmet
34、ry plane, the minimum dimensions being in the longitudinal axis direction (Figure 4 shows the dimensions to be checked). 3.3.2 Check worn kingpins either by direct measurement or using special gauges. Key 1 dimension to be checked, upper diameter 2 dimension to be checked, inner diameter Figure 4 Di
35、mensions to be checked on 50 mm and 90 mm fifth wheel kingpins 3.4 Hook couplings 3.4.1 During normal operation, mechanical contact between the hook coupling and the toroidal eye generates wear of the inner surface of the hook. It is generally noted that this results in a widening of the inner clear
36、ance in the longitudinal axis direction (Figure 5 shows the dimension to be checked). 3.4.2 Check worn hook couplings either by direct measurement or using special gauges. 3.5 Toroidal eyes 3.5.1 During normal operation, mechanical contact between the toroidal eye and the hook coupling generates wea
37、r of the torus at the foremost extremity of the eye. It is generally noted that this results in a minimum thickness of the torus that does not necessarily have to be in the horizontal or vertical axis direction (Figure 6 shows the dimension to be checked). 3.5.2 Check worn toroidal eyes either by di
38、rect measurement or using special gauges. 3.5.3 Check the thickness of the foremost extremity of the torus at the weakest spot of the torus section, which may be measured in any axis direction of the torus. ISO/TS 20825:2003(E) ISO 2003 All rights reserved 5Key 1 dimension to be checked Figure 5 Dim
39、ension to be checked on hook couplings Key 1 dimension to be checked 2 wear Figure 6 Dimension to be checked on toroidal eyes 4 Limit dimensions for worn components 4.1 40 mm drawbar couplings and eyes Limit dimensions for worn 40 mm drawbar couplings and eyes, checked in accordance with 3.1 and 3.2
40、, are given in Table 1. ISO/TS 20825:2003(E) 6 ISO 2003 All rights reservedTable 1 Limit dimensions for worn 40 mm drawbar couplings and eyes Dimensions in millimetres Mechanical coupling In-use limit dimension 40 mm drawbar coupling pin aW 36,5 40 mm drawbar eye bush bu 41,5 40 mm drawbar eye thick
41、ness cW 28 aOuter diameter of the pin: standard design dimension is as shown in ISO 3584:2001, Figure 7, side view. bInner diameter of the bush: standard design dimension is as shown in ISO 8755:2001, Figures 2 and 3. cThickness of the eye: standard design dimension is as shown in ISO 8755:2001, Fig
42、ure 1, Section C-A. 4.2 50 mm drawbar couplings and eyes Limit dimensions for worn 50 mm drawbar couplings and eyes, checked in accordance with 3.1 and 3.2, are given in Table 2. Table 2 Limit dimensions for worn 50 mm drawbar couplings and eyes Dimensions in millimetres Mechanical coupling In-use l
43、imit dimension 50 mm drawbar coupling pin aW 46,5 50 mm drawbar eye bush bu 51,5 50 mm drawbar eye thickness cW 41,5 aOuter diameter of the pin: standard design dimension is as shown in ISO 3584:2001, Figure 7, side view. bInner diameter of the bush: standard design dimension is as shown in ISO 1102
44、:2001, Figures 2 and 3. cThickness of the eye: standard design dimension is as shown in ISO 1102:2001, Figure 1, side view. 4.3 50 mm fifth wheel kingpins Limit dimensions for worn 50 mm fifth wheel kingpins, checked in accordance with 3.3, are given in Table 3. Table 3 Limit dimensions for worn 50
45、mm fifth wheel kingpins Dimensions in millimetres Mechanical coupling In-use limit dimension 50 mm fifth wheel kingpin, upper cylinder aW 71 50 mm fifth wheel kingpin, median cylinder bW 49 aOuter diameter of the upper cylinder: standard design dimension is as shown in ISO 337:1981, Figure 1. bOuter
46、 diameter of the median cylinder: standard design dimension is as shown in ISO 337:1981, Figure 1. ISO/TS 20825:2003(E) ISO 2003 All rights reserved 74.4 90 mm fifth wheel kingpins Limit dimensions for worn 90 mm fifth wheel kingpins, checked in accordance with 3.3, are given in Table 4. Table 4 Lim
47、it dimensions for worn 90 mm fifth wheel kingpins Dimensions in millimetres Mechanical coupling In-use limit dimension 90 mm fifth wheel kingpin, upper cylinder aW 112 90 mm fifth wheel kingpin, median cylinder bW 86 aOuter diameter of the upper cylinder: standard design dimension is as shown in ISO
48、 4086, Figure 1. bOuter diameter of the median cylinder: standard design dimension is as shown in ISO 4086, Figure 1. 4.5 Hook couplings and toroidal eyes Limit dimensions for worn 68 mm and 76 mm toroidal eyes, and the relevant hook couplings, checked in accordance with 3.4 and 3.5, are given in Ta
49、ble 5. Table 5 Limit dimensions for worn hook couplings and toroidal eyes Dimensions in millimetres Mechanical coupling In-use limit dimension hook coupling au 49 68 mm and 76 mm toroidal eye bW 37 aInner longitudinal clearance of the hook: standard design dimension is as shown in Regulation No. 55, Revision 1, Figure 19. bOuter diameter of the torus: standard design dimension is as shown in Regulation ECE:2001 No. 55, Revision 1, Figure 14. ISO/TS 20825:2003(E) ICS 43
