BS ISO 3584:2020 pdf download – Road vehicles — Clevis couplings — Interchangeability
This document specifies the characteristics necessary for the mounting and interchangeability of clevis couplings on the frame (cross member, drawbeam or mounting bracket) of towing vehicles for trailers.
This document is applicable to clevis couplings intended for connection to trailers equipped with a drawbar eye on the drawbar of the trailer.
Characteristics not specified are left to the discretion of the component manufacturer.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 1102, Commercial road vehicles — 50 mm drawbar eye — Interchangeability
ISO 8718, Road vehicles — Drawbar couplings and eyes for hinged drawbars — Strength tests
ISO 8755, Commercial road vehicles — 40 mm drawbar eye — Interchangeability
ISO 12357, Commercial road vehicles — Drawbar couplings and eyes for rigid drawbars
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4.1 Reference may be made to this document both for clevis coupling mounting dimensions on the frame and for the separate clevis coupling.
4.2 Frames in conformance with this document shall be identified by the following information, in the order given:
a) reference to this document;
b) number of the category according to Table 1.
EXAMPLE Frames with mounting dimensions according to category 3:
Crossmember (or drawbeam or mounting bracket) ISO 3584 — Category 3
4.3 Clevis couplings meeting the requirements of this document shall be identified by the following information, in the order given:
5.2 Dimensional requirements on frame for mounting clevis coupling Dimensions on the frame required for mounting of the clevis coupling (see Figure 2), such as the minimum flat surface defined by dimensions F and G, shall be as given in Table 2. Tolerances on drilling pattern dimensions shall be as shown in Figure 1.
6 Clevis Couplings
The requirements of 6.2 to 6.4 are applicable to all clevis couplings. Additional requirements applicable to C 40, C 50 and classified clevis couplings of both dimensions are given in 6.5.
6.2 Load requirements
The clevis coupling shall satisfy the tests specified in ISO 8718 or ISO 12357 or both.
6.3 Dimensional requirements
The maximum outer dimensions of all components of the clevis coupling shall be within the envelope box defined in Table 3 (see Figure 3).
In order to permit safer operation of the clevis coupling, there shall be adequate free space around actuating devices. Dimensions needed to ensure operating clearance for actuating devices are also shown in Figure 3.
6.4 Articulation angles
The clevis coupling shall be designed so as to permit the drawbar eye, when coupled but not fitted to a vehicle, to reach the following non-simultaneous degrees of articulation:
— ±90° horizontally about the vertical axis from the longitudinal axis of the vehicle (see Figure 4);
— ±20° vertically about the transverse axis from the horizontal plane of the vehicle (see Figure 5);
— ±25° axial rotation about the longitudinal axis from the horizontal plane of the vehicle (see Figure 6).
NOTE Dimensions for ensuring operating clearance between towing vehicles and trailers are given in ISO 11406  and ISO 11407  .
6.5 Additional requirements
6.5.1 C 40 clevis couplings
C 40 clevis couplings shall be designed so as to permit the articulation angles described in 6.4 with drawbar eyes according to ISO 8755.
6.5.2 C 50 clevis couplings
C 50 clevis couplings shall be designed so as to permit the articulation angles described in 6.4 with drawbar eyes according to ISO 1102.
6.5.3 Classified C 40 and C 50 clevis couplings
Dimensions of classified 40 mm and 50 mm clevis couplings (see Figure 7) shall be as given in Table 4.
The couplings shall be suitable and tested for the minimum characteristic values given in Tables 5 and 6.