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GB 26512-2021: The protection of the occupants of the cab of commercial vehicles
GB 26512-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S 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’s 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,...