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GB 26512-2021 English PDF (GB26512-2021)

GB 26512-2021 English PDF (GB26512-2021)

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GB 26512-2021: The protection of the occupants of the cab of commercial vehicles

This Standard specifies the requirements, test methods and implementation of standard on the protection of the occupants of the cab of commercial vehicles. This Standard is applicable to Category N vehicles.
GB 26512-2021
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 43.040
T 26
Replacing GB 26512-2011
The Protection of the Occupants of the Cab of
Commercial Vehicles
ISSUED ON: FEBRUARY 20, 2021
IMPLEMENTED ON: JANUARY 1, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Requirements ... 6
5 Test Methods ... 7
6 Implementation of Standard ... 13
Appendix A (normative) Mannequin Used for the Test of Living Space ... 14 Appendix B (normative) Three Dimensional Coordinate System and Reference Data Related to the Riding Position ... 17
Appendix C (normative) Instructions for Vehicle Fixing on the Test Bench ... 19 Bibliography ... 24
The Protection of the Occupants of the Cab of
Commercial Vehicles
1 Scope
This Standard specifies the requirements, test methods and implementation of standard on the protection of the occupants of the cab of commercial vehicles. This Standard is applicable to Category N vehicles.
2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 3730.1 Motor Vehicles and Trailers - Types - Terms and Definitions GB/T 4780 Terms for Motor Vehicle Body
GB 11551 The Protection of the Occupants in the Event of a Frontal Collision for Motor Vehicle
GB 11557 The Stipulation Protecting Drivers from being Injured by Motor Vehicle Steering Mechanism
GB/T 15089 Classification of Power-driven Vehicles and Trailers
GB/T 20913 The Protection of the Occupants in the Event of an Off-set Frontal Collision for Passenger Car
GB/T 29120 Procedure for H-point and R-point Determination
ISO 4130 Road Vehicles - Three Dimensional Reference System and Fiducial Marks - Definition
3 Terms and Definitions
What is defined in GB/T 3730.1, GB/T 4780, GB/T 15089 and GB/T 29120, and the following terms and definitions are applicable to this document.
3.1 Vehicle Type
4 Requirements
4.1 General Requirements
4.1.1 The design of the cab and its connection to the vehicle shall eliminate the risk of injuring the occupants in the cab in the event of an accident as much as possible. 4.1.2 Category N1 vehicles and Category N2 vehicles with a total mass of not more than 7,500 kg shall comply with the relevant content of Test A, Test C and Test D specified in 5.5, 5.7 and 5.8. Vehicle types that satisfy the requirements for frontal collision specified in GB 11557 or GB 11551 or GB/T 20913, and vehicles of Category N1 derived from M1 that satisfy the stipulations of GB 11551 or GB/T 20913 may be deemed as compliant with the requirements for frontal impact test (Test A). Test C and Test D are merely conducted on vehicles with a separate cab.
4.1.3 Category N3 vehicles and Category N2 vehicles with a total mass of more than 7,500 kg shall comply with the relevant content of Test A, Test B, Test C and Test D specified in 5.5, 5.6, 5.7 and 5.8. Test C and Test D are merely conducted on vehicles with a separate cab.
4.1.4 The frontal impact test (Test A) is merely conducted on cab-over engine vehicles. 4.1.5 In order to verify the compliance with 4.1.2 or 4.1.3, the vehicle manufacturer shall determine to use 1, 2, 3 or 4 cabs for the tests. The two stages of Test C shall be carried out on the same cab.
4.1.6 If the vehicle manufacturer can perform computer simulations or calculations on the strength of each component of the cab in accordance with the test conditions specified in the standard, or prove through other modes that the cab does not have deformations (intrusion into the living space) that would endanger the occupants after being subjected to Test A, Test B, Test C and Test D, then, Test A, Test B, Test C and Test D may not be carried out.
4.2 Living Space after the Test
4.2.1 After completing each test described in 4.1.2 or 4.1.3, there shall be a living space in the cab to accommodate the mannequin specified in Appendix A on the seat, and when the seat is in the middle position, the mannequin shall not come into contact with non-elastic components on the vehicle with a Shore A hardness of not less than 50. Non-elastic components that can be moved from the mannequin with a force less than 100 N without using any tools are not considered here. In order to facilitate the installation, the mannequin may be disassembled and put into the cab for assembly; the seat is allowed to be adjusted to the final position. After the assembly of the mannequin is completed, the ?€?H?€? point and the ?€?R?€? point of the seat shall coincide. The placement of the mannequin and the determination of the ?€?R?€? point of the seat shall comply with the requirements of GB/T 29120; the reference data of the position of the f---the distance between the swing arms, f ??? 1,000 mm;
L---the length of the swing arms, L ??? 3,500 mm.
Figure 2 -- A-pillar Impact Test (Test B)
5.6.2 The impactor assembly shall be a rigid structure. The impactor is freely suspended by two swing arms rigidly fixed on it; the distance between the swing arms shall be not less than 1,000 mm (see f in Figure 2). The length of the swing arms, from the suspension axis to the geometric center of the impactor, shall be not less than 3,500 mm (see L in Figure 2).
5.6.3 The position where the impactor is suspended shall be such that it satisfies the following requirements when in a vertical position:
---The impact surface of the impactor is in contact with the frontmost part of the cab;
---The longitudinal centerline of the impactor is horizontal and perpendicular to longitudinal center plane of the cab;
---Along the longitudinal center plane of the windshield and the cab, conduct the measurement; the height of the center of gravity of the impact shall be located in the middle of the upper and lower frames of the windshield;
---The center of gravity of the impactor shall be located in the longitudinal center plane of the cab;
---The length of the impactor shall be uniformly distributed along the breadth of the vehicle and cover the entire breadth between the two A-pillars.
5.6.4 The impactor shall impact the front of the cab in a front-to-rear direction. The impact direction shall be horizontal and parallel to the longitudinal center plane of the vehicle.
5.6.5 The impact energy shall be 29.4 kJ.
5.7 Top Strength Test (Test C)
5.7.1 General requirements
5.7.1.1 For Category N3 vehicles and Category N2 vehicles with a total mass of more than 7,500 kg, conduct the test specified in 5.7.2 and 5.7.3 in a certain sequence on the same cab.
5.7.1.2 For Category N1 vehicles and Category N2 vehicles with a total mass of not more than 7,500 kg, merely conduct the test specified in 5.7.3.
Appendix C
(normative)
Instructions for Vehicle Fixing on the Test Bench
C.1 General Requirements
C.1.1 Vehicle fixing
Measures shall be taken to ensure that the vehicle does not have significant movement during the test. In order to reach the above requirement, the parking brake shall be in the braking position, the gearbox shall be in gear, and the front wheels shall be wedged with wedges.
C.1.2 Chain or steel wire rope used for fixing
The chain or steel wire rope used for fixing shall be made of steel and can at least withstand a pulling force of at least 98 kN.
C.1.3 Skid beam of vehicle frame
The longitudinal beam of the vehicle frame shall be placed on the skid beam spanning its full width. The skid beam may also be rigid composite material or adjustable metal bracket. The length of the skid beam shall be not less than 150 mm. The front edge of the skid beam shall not be located in front of the last point of the cab, nor shall it be located behind the midpoint of the wheelbase (see Figure C.1). In accordance with the vehicle manufacturer?€?s requirements, the frame shall be in the state when the vehicle is fully loaded.
C.1.4 Longitudinal fixing
Tie the chain or steel wire rope A to the front end of the frame, so as to limit the backward movement of the chassis frame. The tying points shall be symmetrical to the longitudinal centerline of the frame, and the distance between two tying points shall be not less than 600 mm. After the chain or steel wire rope is tensioned, the downward included angle with the horizontal line shall be not more than 25??; the included angle between the projection on the horizontal plane and the longitudinal centerline of the vehicle shall be not more than 10??. The chain or steel wire rope may be intersecting. C.1.5 Tensile force and rear fixing of chain or steel wire rope
For Test A and Test B, firstly, use a force of 1 kN to tension the chain or steel wire rope C, then, tension all four chains or steel wire rope A and steel wire rope B; make the tensile force of the chain or steel wire rope C not less than 10 kN. The included angle between the chain or steel wire rope C and the horizontal line is not more than 15??. To Measures shall be taken to ensure that the frame does not have significant movement during the test.
C.4 Top Strength Test (Test C)
C.4.1 Cab installed on the vehicle
C.4.1.1 When Test C is conducted on the cab installed on the vehicle, the cab shall be fixed in accordance with the requirements of C.1.
C.4.1.2 In addition to satisfying the requirements of C.1.3, additional support shall be placed at the bottom of the longitudinal beams on both sides of the front end of the frame (see Figure C.2).
C.4.1.3 Use chain or steel wire rope E and F to symmetrically tie on both sides of the longitudinal centerline of the frame, so as to limit the lateral movement of the chassis frame. The distance between the tying points of the chain or steel wire rope E on the frame and the front end of the vehicle shall be not less than 3 m, but not more than 5 m. The tying points of the chain or steel wire rope F on the frame shall be between the center of the front axle of the vehicle and the front end of the vehicle. After the chain or steel wire rope is tensioned, the downward included angle with the horizontal line shall be not more than 20??; the included angle between the projection on the horizontal plane and the longitudinal axis of the vehicle shall be 90?? ?? 5?? (see Figure C.2). C.4.2 Cab installed on the frame
Measures shall be taken to ensure that the frame does not have significant movement during the test.
C.5 Rear-wall Strength Test (Test D)
C.5.1 Cab installed on the vehicle
Measures shall be taken to ensure that the vehicle does not have significant movement during the test. In order to reach the above requirement, the parking brake shall be in the braking position, the gearbox shall be in gear, and the front wheels shall be wedged with wedges.
C.5.2 Cab installed on the frame
Measures shall be taken to ensure that the frame does not have significant movement during the test.

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