GB/T 31883-2015 PDF English

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GB/T 31883-2015: Road vehicles -- Drawbar couplings, drawbar eyes, fifth wheel kingpins, hook couplings and toroidal eyes -- Wear limits for in-use mechanical couplings
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GB/T 31883-2015: Road vehicles -- Drawbar couplings, drawbar eyes, fifth wheel kingpins, hook couplings and toroidal eyes -- Wear limits for in-use mechanical couplings

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NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.080.10 T 70 Road Vehicles - Drawbar Couplings, Drawbar Eyes, Fifth Wheel Kingpins, Hook Couplings and Toroidal Eyes – Wear Limits for In-Use Mechanical Couplings (ISO/TS 20825:2003, MOD) ISSUED ON: SEPTEMBER 11, 2015 IMPLEMENTED ON: DECEMBER 01, 2015 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC.

Table of Contents

Foreword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Inspection of Parts Wear ... 5 4 Wear Limit Size of Parts ... 9 Appendix A (Normative) Specified Size, Use Limit Size and Allowable Wear Extent of Mechanical Couplings ... 12 Road Vehicles - Drawbar Couplings, Drawbar Eyes, Fifth Wheel Kingpins, Hook Couplings and Toroidal Eyes - Wear Limits for In-Use Mechanical Couplings

1 Scope

This Standard specifies the wear limit size and maximum allowable wear extent of the in-use mechanical coupling; so that ensure the safe running of the heavy-duty vehicle installed with such coupling. This Standard is applicable to the following criteria mechanical couplings: --- 40mm and 50mm drawbar couplings (ISO 3584:2001); --- 40mm and 50mm drawbar eyes (ISO 8755:2001 and GB/T 4781-2006); --- 50# and 90# fifth wheel kingpins (GB/T 4606-2006 and GB/T 4607-2006); --- Hook couplings and toroidal eyes (ECE R55, Rev.1:2001).

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document. GB/T 4606 Road Vehicles - 50 Semi-Trailer Fifth Wheel Coupling Pin - Basic and Mounting/Interchangeability Dimensions (ISO 337:1981, IDT) GB/T 4607 Road Vehicles - 90 Semi-Trailer Fifth Wheel Coupling Pin – Basic and Mounting/Interchangeability Dimensions (ISO 4086:2001, IDT) GB/T 4781-2006 Commercial Road Vehicles - 50mm Drawbar Eye - Interchangeability (ISO 1102:2001, IDT) ISO 3584:2001 Road Vehicles – Drawbar Couplings – Interchangeability ISO 8775:2001 Commercial Road Vehicles – 40mm Drawbar Eye – Interchangeability ECE R55, Rev.1:2001 Revision 1: 2001 – Uniform Provisions Concerning the Approval of Mechanical Coupling Components of Combinations of Vehicles

3 Inspection of Parts Wear

3.1 40mm and 50mm drawbar couplings 3.1.1 Under the normal operating conditions, the mechanical contact between the traction connecting pin and the drawbar eye bushing shall cause wear on the surface of the connecting pin; and form an elliptical section on the horizontal symmetry plane of the connecting pin; its minimum dimension is in the longitudinal axis direction of the vehicle (detection size is shown in Figure 1). 3.1.2 Directly measure or use a special gauge to check the size of the connecting pin after wearing. 3.2 40mm and 50mm drawbar eyes 3.2.1 Under the normal operating conditions, the mechanical contact between the drawbar eye bushing and the traction connecting pin shall cause wear on the surface of the connecting pin; and form an elliptical section on the horizontal symmetry plane of the bushing; its maximum dimension is in the longitudinal axis direction of the vehicle (detection sizes are shown in Figures 2 and 3). 3.2.2 Under the normal operating conditions, the mechanical contact between the drawbar eyes and the drawbar couplings shall cause the wear on the upper and lower planes of the drawbar eyes, resulting in thinning of the thickness between the upper and lower planes of the drawbar eye center; the bushing deviates from the normal working position (detection sizes are shown in Figures 2 and 3). 3.2.3 Directly measure or use a special gauge to check the size of the traction ring hole after wearing. 3.2.4 Check the thickness of each side of the longitudinal center plane of the drawbar eyes. couplings and drawbar eyes can see Tables 2 and A.2. Table 2 -- Wear Limit Size of 50mm Drawbar Couplings and Drawbar Eyes Mechanical couplings Use limit size 50mm drawbar couplings a ≥46.5 50mm drawbar eye bushing b ≤51.5 50mm drawbar eye thickness c ≥41.5 a Size of connecting pin: see standard design size shown in the side view of the Figure 7 in ISO 3584:2001. b Internal size of bushing: see standard design size shown in Figures 2 and 3 of GB/T 4781-2006. c Thickness of drawbar eye: see standard design size shown in side view of Figure 1 of GB/T 4781- 2006. 4.3 50# fifth wheel kingpins Check as per the provisions of 3.3; the wear limit use of 50# fifth wheel kingpin shall refer to Tables 3 and A.3. Table 3 -- Wear Limit Size of 50mm Fifth Wheel Kingpins Mechanical couplings Use limit size Upper cylinder of 50# fifth wheel kingpin a ≥71 Middle cylinder of 50# fifth wheel kingpin b ≥49 a External size of upper cylinder of kingpin: see standard design size shown in Figure 1 of GB/T 4606- 2006. b External size of middle cylinder of kingpin: see standard design size shown in Figure 1 of GB/T 4606- 2006. 4.4 90# fifth wheel kingpins Check as per the provisions of 3.3; the wear limit size of 90# fifth wheel kingpin shall refer to Tables 4 and A.4. Table 4 -- Wear Limit Size of 90# Fifth Wheel Kingpins Mechanical couplings Use limit size Upper cylinder of 90# fifth wheel kingpin a ≥112 Middle cylinder of 90# fifth wheel kingpin b ≥86 a External size of upper cylinder of kingpin: see standard design size shown in Figure 1 of GB/T 4607- 2006. b External size of middle cylinder of kingpin: see standard design size shown in Figure 1 in GB/T 4607- 2006. 4.5 Hook couplings and toroidal eyes Check as per the provisions of 3.4 and 3.5; the wear limit size of 68mm and 76mm toroidal eyes and corresponding hook couplings shall refer to Tables 5 and A.5. Unit: mm Unit: mm Unit: mm

Appendix A

(Normative) Specified Size, Use Limit Size and Allowable Wear Extent of Mechanical Couplings A.1 40mm drawbar couplings and drawbar eyes The specified size, use limit size and allowable wear extent of 40mm drawbar couplings and drawbar eyes can refer to Table A.1. Table A.1 -- Specified Size, Use Limit Size and Allowable Wear Extent of 40mm Drawbar Couplings and Drawbar Eyes Mechanical couplings Basic size Use limit size Allowable wear extent Detection position 40mm drawbar couplings 38 (ISO 3584) ≥36.5 ≤1.5 Check the connecting pin wear from the longitudinal axial direction of the vehicle, see Figure 1 40mm drawbar eye bushing 40 (ISO 8755) ≤41.5 ≤1.5 Check the busing wear form the longitudinal axial direction of the vehicle, see Figure 2 40mm drawbar eye thickness 30.5 (ISO 8755) ≥28 ≤2.5 Check the thickness of each side of the longitudinal center surface of the drawbar eyes, see Figure 2 A.2 50mm drawbar couplings and drawbar eyes The specified size, use limit size and allowable wear extent of 50mm drawbar couplings and drawbar eyes can refer to Table A.2. Table A.2 -- Specified Size, Use Limit Size and Allowable Wear Extent of 50mm Drawbar Couplings and Drawbar Eyes Mechanical couplings Basic size Use limit size Allowable wear extent Detection position 50mm drawbar couplings 48.6 (ISO 3584) ≥46.5 ≤2.1 Check the connecting pin wear from the longitudinal axial direction of the vehicle, see Figure 1 50mm drawbar eye bushing 50 (GB/T 4781) ≤51.5 ≤1.5 Check the busing wear form the longitudinal axial direction Unit: mm Unit: mm ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.

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