Renault 31-00-002 Underbody Thermal Screens Function Description

The standard “Renault 31-00-002 Underbody thermal screens function description” developed by the French automobile company Renault describes the characteristics and requirements of thermal and acoustic attack protection systems fixed to the platform. It means an “environment plan” consisting of scanning the peripheral organs of thermal screens.

The platform heat shields protect the components located opposite the exhaust line. In some cases, thermal curtains contribute to the acoustic insulation of the passenger compartment in order to reduce external noise (thermo-acoustic). This study considers the fixings when integrated into the heat shield. The vehicles involved are all passenger cars and light commercial vehicles (SUVs).

Items included in the CDC scope, whether or not part of the system environment, include:

• Thermal tunnel screens
• Tank thermal screens
• Silent thermal screens
• Steering box thermal screens
• Apron thermal screens
• Mounts built into screens

Items not covered by the CDC include:

• Heat source component (exhaust line, catalytic converter, DPF, etc.)
• Liquid carrying parts (fuel lines and similar)
• Electrical components (cables, probes, sensors, etc.)
• Plastic parts (covers, covers, cable ducts, etc.)
• Other organs (sound absorbing, absorbing, heavy carpet masses and the like)
• Thermal screens installed in GMP, drivetrain, spare wheel basket and exhaust line
• Heat shield fixing

The objectives of this standard include:

• Formulate functional requirements for thermal screens of the base
• Allowing consultation with one or more suppliers
• Preparing a development file base

For the purposes of this standard,

• It refers to the platform (receiving element for thermal screens), underbody, engine cradle, steering rack and fuel tank.
• Continuous temperature is the temperature that an organ must be able to withstand indefinitely.
• Peak temperature is the temperature that an organ must be able to withstand for a limited period of time.
• The hot side is the part of the screen that is directly exposed to radiation or faces the exhaust line.
• The cold side is the back side of the hot side, that is, the part of the screen that is not exposed to radiation.
• Integrated fixings refer to fixings integrated into the heat shield.

The life of heat shields is defined by the reliability class. The life of the heat shield protecting the fuel, brake and electrical circuits is class A. The life of other screens is class C. The breakdown of reliability targets is defined in the standard.

The characterization of the functions is defined in a functional table. This is divided into the required services and the restrictions that the thermal screens must overcome. This table consists of 5 columns:

• Criteria: Characteristics used to evaluate the way a function or constraint is performed and respected.
• Levels: The expected performance levels or requirements for each criterion.
• HCPP: Prioritization of product process characteristics.
• Control methods: Tools that ensure conformity to the required level to be controlled (test methods, standards or specifications).
• Supplier response: This is the section reserved for the supplier to document the verification results.

Values ​​highlighted in yellow are values ​​that vary depending on the project and must be specified by Renault.

Unless otherwise specified in the test methods, each verification specified in this standard shall be performed on one part or one sample. This number may be varied for a possible statistical study of the distribution of results.

Among the numerous tests, measurements, analyses and evaluation studies that our organization has carried out for businesses in various sectors, it also provides testing services defined in the “Renault 31-00-002 Underbody thermal screens function definition” standard with its trained and expert staff and advanced technological equipment.