GB24406-2024

Strength of student seat and their anchorages of special school bus

专用校车学生座椅及其车辆固定件的强度

GB 24406-2024 é uma norma nacional chinesa obrigatória vigente: Strength of student seat and their anchorages of special school bus. Setor: Eletrônicos. Foco: Segurança de produtos. Entrada em vigor: 1 de jan. de 2025.

A aplicabilidade depende do escopo do produto, da via de certificação, dos avisos da autoridade competente e das regras de transição. Solicite uma tradução ou verifique a fonte antes de usar este registro em uma decisão de conformidade.

Visão geral de conformidade

Esta visão geral está disponível por enquanto apenas em inglês.

Escopo e aplicabilidade

This standard specifies the strength requirements and testing methods for student seats and their vehicle anchorages in special school buses. It is applicable to student seats installed in special school buses, the vehicle anchorages used for their installation, and restraining barriers mounted in front of student seats. This standard is mandatory for all manufacturers of special school buses in China. It references GB 24407 for safety technical conditions and GB 14166 for seatbelt specifications.

Requisitos técnicos

The standard mandates that all student seats must be forward-facing and equipped with automatic locking devices. During frontal crash scenarios, the standard specifies strict limits on dummy displacement and injury criteria, including Head Injury Criterion (HIC15), neck injury (Nij), and chest acceleration (ThAC). Manufacturers must ensure that seatbelts effectively restrain the dummy and that the buckle release force does not exceed specified limits post-crash. For rear crash performance, the standard sets requirements for dummy injury metrics and limits the maximum change in seatback recline angle. Structural integrity is heavily emphasized; seats, attachments, and anchorages must not completely separate during impacts. Even if partial separation of anchorages occurs, the seat must remain secured with all locking devices engaged. Additionally, the standard outlines specific strength requirements for seat cushions under upward force.

Métodos de ensaio

The standard replaces the previous static loading test with comprehensive dynamic crash tests. It details procedures for both frontal and rear impact simulations using specific child dummies (e.g., Q-series 6-year-old and Hybrid III 5th percentile). The frontal test requires a velocity change of 32-34 km/h, while the rear impact test requires 20-21 km/h. Engineers must follow precise waveform criteria and data processing channels as specified in the appendices. The standard also introduces criteria for same-type evaluation to streamline testing across multiple seat variants.

Perguntas frequentes

What products are regulated under GB 24406-2024?

It regulates student seats, their vehicle anchorages, and restraining barriers used in special school buses operating in China.

What are the main updates from the previous GB 24406-2012 version?

The 2024 version introduces rear crash dynamic test methods, adds neck injury (Nij) requirements, and deletes the static loading test method. It also updates dummy positioning and waveform descriptions.

When does GB 24406-2024 take effect?

The standard takes effect on January 1, 2025, for new type approvals, and 13 months later for previously approved models.

The summary above provides a high-level overview of GB 24406-2024. To ensure complete compliance for your special school bus products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 24406-2024 today to access all detailed parameters, injury criteria formulas, and testing procedures.

Indicações de aplicabilidade

Tipo: Segurança
CCS: T26
ICS: 43.040.60
Órgão competente: Ministry of Industry and Information Technology
Comitê técnico: National Technical Committee on Automobiles of Standardization Administration of China

Relações

Substitui:GB 24406-2012