Main changes of GB 7258-20 12:
1. Lateral dynamic stability
GB 7258-20 12 has stricter requirements for the roll stability of large buses. On the basis of "in the static no-load state, the maximum roll stability angle of the passenger car tilting to the left and right should not be less than 35, and the maximum roll stability angle of the passenger car tilting to the left and right should not be less than 28 when the passenger car is full and the luggage box is empty. The school bus tilts left and right, and the maximum roll stability angle is not less than 32.
The "Draft for Review" revised the requirements for the roll stability angle of passenger cars, tank cars and tank trailers: the maximum roll stability angle of passenger cars tilting to the left and right should be greater than or equal to 28, and the test method should comply with the provisions of GB 13094, GB/T 16887 and other relevant standards.
The draft for comment stipulates that the maximum roll stability angle to the left and right should not be less than 28 when the bus is loaded to the most unfavorable load state according to the relevant regulations under the quality of the kerb running state.
2. school bus
The definition of school bus in "Draft for Review" is: school bus refers to a passenger car used to transport no less than 5 students from kindergartens, primary schools, middle schools and other educational institutions to and from school in an organized way; Children's school bus is a school bus that transports preschool children over 3 years old to and from school; The primary school bus is the school bus that transports primary school students to and from school; The special school bus is designed and manufactured for transporting students. Non-dedicated school bus refers to a bus that is not specially designed and manufactured to transport students, but is used to transport no less than 5 students to and from school in an organized way.
In the exposure draft, the school bus refers to a passenger car used to pick up and drop off at least five students and their caregivers from kindergartens, primary schools, middle schools and other educational institutions. According to passengers, it is divided into children's school buses, primary school buses and other school buses; According to the vehicle attributes, it is divided into special school buses and non-special school buses. Children's school bus is a school bus that transports preschool children over 3 years old to and from school; Pupils' school bus is the school bus that transports pupils to and from school; The special school bus is specially designed and manufactured for transporting students; Non-dedicated school buses refer to school buses that are not specially designed and manufactured for transporting students.
3. Rules for the use of retreaded tires
According to GB 7258-20 12, road buses, tourist buses, school buses, etc. Do not use retreaded tires.
According to the "Draft for Review", the steering wheel of motor vehicles shall not be equipped with refurbished tires; Other wheels, such as retreaded tires, should meet relevant standards.
According to the "Draft for Comment", the steering wheel of motor vehicles is not allowed to install retreaded tires; Other wheels, such as retreaded tires, should meet the relevant standards, and the tires of passenger cars and dangerous goods transport vehicles should not use retreaded tires at the same time.
4. Full load
The provisions of GB 7258-20 12 are consistent with the provisions of the Notice, that is, the bus bodies of road buses and tourist buses with a length exceeding 1 1 m should be full-load integral frame structures. The above-mentioned buses newly finalized from March 20 12 and 1 year shall meet the above requirements; The above buses produced since September 20 12 1 year shall meet the above requirements.
According to the draft for approval, the superstructure of buses should have sufficient strength and rigidity, and the superstructure strength of special school buses, road buses, tourist buses and buses without passengers standing areas should comply with GB/T 17578. The sleeper bus body should be a full-load integral frame structure.
According to the exposure draft, the superstructure of passenger cars should have sufficient strength and rigidity, and the superstructure strength of road buses, tourist buses, buses where passengers are not allowed to stand and special school buses should comply with GB/T 17578. Sleeper buses, road buses, tourist buses, buses where passengers are not allowed to stand, and special school buses with a length of more than 1 1 m shall adopt a full-load integral frame structure.
5. Disc brake
The provisions of GB 7258-20 12 are consistent with the provisions of the Notice, that is, the front wheels of road buses and tourist buses with a length of more than 9 meters should be equipped with disc brakes; The front wheels of dangerous goods transport vehicles and trucks with a total mass greater than 12 tons shall be equipped with disc brakes. The above-mentioned passenger cars and trucks newly finalized from March 20 12 to March 20 1 year shall meet the above requirements; The above passenger cars and trucks produced since September 20 12 1 year shall meet the above requirements.
According to the draft for approval, all wheels of automobiles (excluding tricycles), motorcycles (excluding side tricycles) and trailers (excluding trailers with a total mass of no more than 750kg) should be equipped with brakes. Among them, the front wheels of dangerous goods transport vehicles and passenger cars with a length of more than 9m should be equipped with disc brakes.