ANNEX 5

Requirements for mechanical coupling devices or components for vehicles of categories T, R and S

1. Coupling balls 80 and keeper plates (Class a80)

1.1. General requirements for coupling balls 80

1.1.1. All coupling balls 80 and keeper plates shall be designed such that the coupling balls satisfy the tests prescribed in paragraph 3.1 of Annex 6 and keeper plates satisfy the tests prescribed in paragraph 3.3.5 of Annex 6.

1.1.2. Coupling balls 80 of class a shall conform to Figure 1 in external shape and external dimensions. The position of the keeper plate is shown in Figure 2.

Figure 1

Coupling ball of Class a (all dimensions in mm)

Figure 2

Keeper plate dimensions (all dimensions in mm)

1.1.3. The coupling balls 80 shall have at least the following angles of articulation, which do not have to be reached simultaneously:

Figure 3

Angles of articulation

2. Coupling head 80 (Class b80)

2.1. General requirements for coupling head 80

2.1.1. All coupling head 80 shall be designed so that they are able to satisfy the tests given in paragraph 3.2 of Annex 6.

2.1.2. Coupling head 80 of class b shall conform to Figure 4 in external shape and external dimensions.

Figure 4

Dimensions of coupling head 80 of Class b (all dimensions in mm)

3. Clevis-type drawbar couplings (Class c40)

3.1. General requirements for clevis-type drawbar couplings

3.1.1. All clevis-type drawbar couplings shall be designed so that they satisfy the tests prescribed in paragraph 3.3.1 of Annex 6 and locking devices so that they satisfy the tests prescribed in paragraph 3.3.1.3 of Annex 6.

3.1.2. Clevis-type drawbar couplings of class c shall conform to Figures 5, 6 and 7 in external shape and external dimensions. For all classes, the maximum height of the jaw shall be constant over at least half the width of the jaw.

3.1.3. Requirements: In the case of automatic couplings, the closed and locked position shall be clearly and conspicuously indicated externally after coupling by at least one control indicator.

3.1.4 Clevis-type drawbar couplings shall have the following angles of articulation (see also Figures 5 and 6): (a) Vertical axis: ± 70° min. (b) Transverse axis: ± 20° min. (c) Longitudinal axis: ± 20° min.

3.1.5 The jaw shall permit the drawbar rings to swivel axially at least 90° to the right or left around the longitudinal axis of the coupling with a fixed braking momentum of between 30 and 150 Nm.

Figure 5

Automatic coupling device with bulged pin (left) and automatic trailer coupling with cylindrical pin (right) (all dimensions in mm)

Figure 6

Non-automatic trailer coupling with cylindrical pin (all dimensions in mm)

4. Drawbar eyes (Class d40-1 and d40-2)

4.1. Drawbar eyes d40-1

4.1.1 General requirements for drawbar eyes d40-1 All drawbar eyes of class d40-1 shall be designed so that they are able to satisfy the tests given in paragraph 3.4 of Annex 6. Drawbar eyes d40-1 may be equipped with or without socket. Drawbar eyes shall conform to Figure 7 in the external shape and external dimensions of the ring.

Figure 7

Principal dimensions of standard drawbar eyes d40-1 (all dimensions in mm)

4.2. Drawbar eyes d40-2

4.2.1. General requirements for drawbar eyes d40-2 All drawbar eyes of class d40-2 shall be designed so that they are able to satisfy the tests given in Annex 6. Drawbar eyes shall conform to Figure 8 in the external shape and external dimensions of the ring.

Figure 8

Principal dimensions of standard coupling ring d40-2

Dimensions in millimetres

4.3. Toroidal drawbar eye (Class d50-1 and d50-2)

4.3.1. General requirements All drawbar eyes of class d50 shall be designed so that they are able to satisfy the tests given in Annex 6. Drawbar eyes of class d50 shall conform to Figure 9 in external shape and external dimensions.

Figure 9

Principal dimensions of toroidal drawbar eye of class d50 (all dimensions in mm)

4.3.2. In addition, toroidal drawbar eye of class d50-1 shall have the dimensions according to Figure 10 and toroidal drawbar eye of class d50-2 shall have the dimensions according to Figure 11.

Figure 10

Dimensions of toroidal drawbar eye of class d50-1 (all dimensions in mm)

Figure 11

Dimensions of toroidal drawbar eye of class d50-2 (all dimensions in mm)

a Alternative outer contour : outer radius 22,5 max. and 15 min. blend radius top and bottom, or min. top and bottom blend radius to flat outer surface.

b Internal contour.

5. Drawbars (Class e)

5.1. Drawbars of class e shall satisfy the tests given in paragraph 3.7 of Annex 6.

5.2. In order to provide a connection to the towing vehicle, the drawbars can be fitted with either coupling head or drawbar eyes of classes b, d or s. coupling head and drawbar eyes can be attached by screwing, bolting or welding.

5.3. Height adjusting devices for hinged drawbars

5.3.1. Hinged drawbars shall be fitted with devices for adjusting the drawbar to the height of the coupling device or jaw. These devices shall be designed so that the drawbar can be adjusted by one person without tools or any other aids.

5.3.2. Height adjusting devices shall be able to adjust the drawbar eyes or coupling head 80 from the horizontal above the ground at least 300 mm upwards and downwards. Within this range the drawbar shall be adjustable steplessly, or in maximum steps of 50 mm measured at the coupling ring or coupling head.

5.3.3. Height adjusting devices shall not interfere with the easy movement of the drawbar after coupling.

5.3.4. The height adjusting devices shall not interfere with the action of any inertia, overrun type, brake.

5.4. In the case of drawbars combined with inertia, overrun, brakes, the distance between the centre of the drawbar eye and the end of the free shank of the drawbar eye shall not be less than 200 mm in the brake application position.With the shank of the drawbar eye fully inserted the distance shall not be less than 150 mm.

5.5. Drawbars for use on rigid drawbar trailers shall possess at least half the moment of resistance against lateral forces as against vertical forces.

6. Towing frames and rail plates (Class f)

Figure 12

Example of a towing frame of class f

6.1. Towing frames of class f shall satisfy the tests given in paragraph 3.6 of Annex 6.

6.2. If the towing frames are intended to be mounted to specified vehicle types the fixing points and the coupling shall be in conformity with the vehicle- or the transmission manufacturers provisions.

6.3. Towing frames can be designed as quick height-adjustable (qha), pin height-adjustable (pha) frame or as frame without height adjustment. The mostly used types are qha-frames for qha-sliders, so called ladder frames as shown in Figure 12.

7. Hitch hooks and keeper plates (Class g)

7.1. General requirements for hitch hooks All hitch hooks of class g and keeper plates shall be designed such that hitch hooks satisfy the tests given in Annex 6 and keeper plates satisfy the tests given in Annex 6. Hitch hooks of class g shall conform to Figure 13 in external shape and external dimensions. The position of the keeper plate is shown in Figure 14. The hitch hook shall permit angles of articulation in accordance with 1.1.3.

Figure 13

Principal dimensions of hitch hook (all dimensions in mm)

Figure 14

Position of the keeper plate (all dimensions in mm)

8. Piton-type couplings and keeper plates (Class h)

8.1. General requirements for piton-type couplings All piton-type couplings of class h and keeper plates shall be designed such that piton-type couplings satisfy the tests given in Annex 6 and keeper plates satisfy the tests given in Annex 6. Piton-type couplings of class h shall conform to Figure 15 in external shape and external dimensions. The position of the keeper plate is shown in Figure 16. The piton-type coupling shall permit angles of articulation in accordance with 1.1.3.

Figure 15

Principal dimensions of piton-type coupling (all dimensions in mm)

Figure 16

Position of the keeper plate (all dimensions in mm)

9. Tractor drawbar couplings non-swivel around longitudinal axis (Class i)

9.1. Tractor drawbar couplings shall have the following angles of articulation (see also Figure 17) a) Vertical axis: ±90° min b) Transverse axis: ±20° min. (±15° for cat.4 and 5) c) Longitudinal axis: ±20° min. (±15° for cat.4 and 5) These angles of articulation do not have to be reached simultaneously.

9.2. The coupling unit shall be tested as in 3.3.3 of Annex 6.

9.3. The drawbar coupling non-swivel clevis unit shall be provided with a device to prevent unintentional uncoupling.

9.4. Drawbar and clevis of Class i shall conform to Figure 17 and Table 2.

Figure 17

Tractor drawbar and clevis dimensions (class i) (all dimensions in mm)

Table 2

Tractor drawbar and clevis- Dimension values

Dimensions in millimetres Dimension Drawbar category 0 1 2 3 4 5 Drawbar width A (1) max. 60 67 90 100 130 160 Drawbar thickness B max. 20 36 52 57 64 80 Pin hole diameter C +1,00/-0,25 20 33 33 41 52,5 72,5 Pin diameter C1 +1,00/-1,50 18,5 31 31 39 51 71 F max. 30 45 45 55 70 80 G (2) min. 140 210 210 210 210 210 Height H min. 50 70 70 90 90 100 Throat depth J min. 50 70 80 80 90 110 End radius of drawbar and clevis R (3) max. 30 45 50 60 80 80 W (3) min. 20 ° 20 ° 20 ° 20 ° 15 ° 15 °

10. Drawbar eyes which are fitted to trailer drawbars for connecting to a tractor drawbar (Class j)

10.1. The coupling unit shall be tested as in 3.3.3 of Annex 6.

10.2. Drawbar eyes of Class j shall conform to Figure 18 and Table 3.

Figure 18

Hitch ring of implement (Class j)

Table 3

Hitch ring specifications (Class j)

Dimension Drawbar category 0 1 2 3 4 5 Hole E (4) min. 23 38 38 47 56 78 Thickness F max. 30 36 38 46 50 60 Distance G max. 40 55 55 75 85 100 Distance H min. 35 40 50 50 65 80 Width J max. 85 107 115 140 160 190 Radius M As required to provide adequate articulation between the tractor and the implement Mmax = F/2 Pin diameter min. In accordance with Table 2

11. Clevis-type drawbar coupling non-swivel around longitudinal axis (Class q)

11.1. The coupling unit shape shall allow the swivel hitch ring the following minimum angles: ±60° in the horizontal plane (yaw) ±20° in the vertical plane (pitch) ±20° around its longitudinal axis (roll) The non-swivel clevis coupling unit shall be provided with a device to prevent unintentional uncoupling.

11.2. The coupling unit shall be tested as in 3.3.3 of Annex 6.

11.3. Clevis type drawbar Class q shall conform to Figure 19 and Table 4.

Figure 19

Clevis type drawbar (Class q)

Table 4

Shapes and dimensions of trailer or implement clevis coupling (Class q)

Shape Dimension (mm) D ±0,5 a min. b min. w 18 50 40 x 28 70 55 y 43 100 80 z 50 110 95

12. Drawbar eye, swivel around longitudinal axis and fitted to the drawbar of trailers for connection with non-swivel clevis type couplings (Class r)

12.1. The coupling unit shall be tested as in 3.3.3 of Annex 6.

12.2. Drawbar Eyes Class r shall conform to Figure 20 and Table 5.

Figure 20

Hitch ring dimensions shall be as shown (class r)

Table 5

Shapes and dimensions (Class r)

Shape Coupling ring (mm) Cylindrical eye configuration Round eye configuration d b c e i h d 1 t d b c e i t h ±0,5 min. min. max. max. ±1 ±3 min. ±0,5 min. min. max. max. min. ±1 W 28 50 80 30 30 20 70 44 22 40 80 30 30 44 20 X 45 70 100 60 40 32 105 63 35 50 100 60 40 63 30 Y 62 90 120 55 40 132 73 50 55 140 55 73 35 Z 73 100 140 75 60 42 157 78 68 60 160 75 60 78 42

13. Coupling devices (Class s) For coupling devices of class s and p, the relevant requirements in Annexes 5 and 6 for the closest standard or non-standard device or component shall be used.

14. Assignment of mechanical coupling devices of towing vehicles or self-propelled machines and towed vehicles The assignment of mechanical coupling devices of towing vehicles or self-propelled machines and towed vehicles shall conform to Table 6. Table 6 Assignment of mechanical coupling devices of towing vehicles or self-propelled machines and towed vehicles Coupling device on the towing vehicle Coupling device on the towed vehicle Class a80 Class b80 Class c40 Class d40-1, d40-2 Class g Class d50-1, d50-2 Class h Class d50-2 Class i Class j Class q Class r

15. Remote operated and/or automatic coupling If the coupling is remote operated or automatic there must always be a remote indication visible to the operator to indicate that coupling has been effected and that the locking devices have engaged. The remote indication shall be in the vehicle cab if the coupling is achieved without leaving the vehicle cab.

(1) The drawbar pin handle, retention devices of clevis may extend beyond width A bur must not interfere with the implement articulation angles specified in clause 10.

(2) G is the distance over which the specified dimensions A and B shall be maintained.

(3) The profile shown in Figure 17 represents the maximum envelope for the drawbar and clevis. The radius R and the angle W may differ from the values given so long as the maximum envelope is not exceeded.

(4) For special applications hole E can be an elongated hole