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QC/T 707-2004 English PDF (QCT707-2004)

QC/T 707-2004 English PDF (QCT707-2004)

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QC/T 707-2004: Technical specification of center box for motor vehicles

This Standard specifies terms and definitions, requirements, test methods, inspection rules, marking, packaging, storage and preservation of center box for motor vehicles. This Standard applies to center box for motor vehicles.
QC/T 707-2004
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
Technical specification for
center box for motor vehicles
ISSUED ON. FEBRUARY 10, 2004
IMPLEMENTED ON. AUGUST 1, 2004
Issued by. National Development and Reform Commission
Table of Contents
Foreword ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Requirements... 7
5 Test methods ... 11
6 Inspection rules ... 13
7 Marking, packaging, storage and preservation ... 14
Annex A (normative) Load procedure of center boxes ... 15
Annex B (normative) Test load of center boxes ... 16
Annex.
Number and name of 15 automotive industry standards
No. Standard No. Standard name No. of the standard being replaced
1 QC/T 698.1-2004 Vehicle instructions - Part 1. Vehicle registration technology parameter table 2 QC/T 459-2004 Truck with loading crane QC/T 459-1999
3 QC/T 699-2004 Tail-lift for vehicle
4 QC/T 700-2004 General technical specification of cylinder head for motorcycles and mopeds 5 QC/T 701-2004 Mounting of rear shock absorbers for motorcycles and mopeds 6 QC/T 702-2004 Method of reliability test for catalytic converter of motorcycles and mopeds 7 QC/T 27-2004 Bench test method of automobile clutch QC/T 27-1992
8 QC/T 25-2004 Technical specification of automobile clutch QC/T 25-1992 9 QC/T 703-2004 Specification of PU foam wrap layer for auto steering-wheel 10 QC/T 704-2004 Test method of PU foam wrap layer integer hardness for auto steering-wheel 11 QC/T 705-2004 Electronic bus-stop annunciator onboard motor coach
12 QC/T 706-2004 Technical specification of silicon avalanche rectification for motor vehicles 13 QC/T 707-2004 Technical specification of center box for motor vehicles 14 QC/T 30-2004 Technical specification of electric horn for motor vehicles QC/T 30-1992 15 QC/T 29106-2004 Technical specification of automobile wire harness QC/T 29106-1992 Foreword
This Standard is the firstly-developed product standard of center box for motor vehicles. In addition to the technical requirements referencing to foreign advanced standards, the other content and the editing of the standard comply with the relevant specifications of GB/T 1 ?€?Directives for standardization?€? and QC/T 413 ?€?Basic technical specifications for electrical equipment of automobiles?€?.
Annex A and Annex B of this Standard are normative.
This Standard is proposed by China Association of Automobile Manufacturers. This Standard is under the jurisdiction of National Technical Committee on Automobile of Standardization Administration of China.
Drafting organizations of this Standard. Harbin Feiban Automobile Electric Appliance Co., Ltd., Hebi Tianhai Automobile Electric Appliance Co., Ltd., Shanghai Xinguang Automobile Electric Appliance Co., Ltd.
Main drafters of this Standard. Luo Ruoxiao, Wang Lisheng, Zhong Huaguang, Wang Rongxi, Gu Shujian.
Technical specification for
center box for motor vehicles
1 Scope
This Standard specifies terms and definitions, requirements, test methods, inspection rules, marking, packaging, storage and preservation of center box for motor vehicles. This Standard applies to center box for motor vehicles (hereinafter referred to as center box).
2 Normative references
The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. For dated reference, subsequent amendments to (excluding corrections to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies. QC/T 413-2002 Basic technical specifications for electrical equipment of automobiles
QC/T 417.1-2001 Automotive wire harness connectors - Part 1. Definitions, test methods and general performance requirements (automotive part)
3 Terms and definitions
For the purpose of this Standard, the following terms and definitions apply. 3.1
connecting plug
A conductive part of an electrical device on the center box used to electrically connect to an external circuit.
3.2
connecting socket
A socket on the center box for connection to a relay plug or chip fuse with a certain clamping force.
3.3
insertion force
The force required to insert the relay, fuse or standard insert into the center box. 3.4
withdrawal force
The force required to withdraw the relay, fuse or standard insert from the center box. 3.5
bridge blade
In the measurement of voltage drop, a kind of blade with different shapes used to connect the parts need energization and conduction after removing the relay or fuse. 4 Requirements
4.1 General requirements
The center box shall comply with the specifications of this Standard and shall be manufactured according to the drawings and design documents approved by the prescribed procedures.
4.2 Temperature range
The center box is continuous rating. It shall be able to normally turn on and off within the temperature range of 40 ??C ~ 70 ??C (in the cab), -40 ??C ~110 ??C (under the engine hood), the storage temperature is -40 ??C ~ 90 ??C (in the cab), -40 ??C ~ 130 ??C (under the engine hood) respectively.
4.3 Shape and installation dimension
The shape and installation dimension of the center box shall comply with the specifications of the drawings of the product. Among them, the electrical connection of the external circuit is not allowed to use riveting and welding.
4.4 Appearance
The center box shall have no damage after being subjected to the resistance to disruptive voltage strength test with an actual sinusoidal voltage of 50 Hz, an effective value of 1000 V and a duration of 1 min.
4.10 No-load ventilation storage performance
The center box shall be subjected to a no-load ventilation storage test at 90 ??C (in the cab) and 130 ??C (under the engine hood) for 48 h. After the test, it shall be able to normally turn on and off, and shall comply with the specifications of 4.4 in this Standard. 4.11 Resistance to low temperature
The center box shall be able to normally turn on and off at -40 ??C, and shall comply with the specifications of 4.4 in this Standard. The voltage drop allows an increase of 20 %.
4.12 Resistance to temperature alternation
The center box shall be subjected to a total of 4 cycles (6 h for one cycle) in the temperature range of -40 ??C ~ 70 ??C (in the cab) and -40 ??C ~ 110 ??C (under the engine hood). After the test, it shall be able to normally turn on and off, and shall comply with the specifications of 4.4 in this Standard. The voltage drop allows an increase of 20 %. 4.13 Resistance to temperature and humidity cycle
The center box shall be subjected to a total of 10 cycles (24 h for one cycle) of the temperature and humidity combined cycle test. After the test, it shall be able to normally turn on and off, and shall comply with the specifications of 4.4 in this Standard. The voltage drop allows an increase of 20 %.
4.14 Vibration resistance
The center box shall be subjected to the sweeping vibration test according to the specifications of Table 3 ?€?Other parts?€? in QC/T 413-2002. After the test, it shall be able to normally turn on and off, and shall comply with the specifications of 4.4 and 4.7 in this Standard.
4.15 Durability (load ventilation storage)
The durability test of the center box shall be carried out by selecting the corresponding load procedure and test load from Figure A.1 of Annex A and Table B.1 of Annex B according to the product function and customer requirements, at the ambient temperature of 70 ??C (in the cab) and 110 ??C (under the engine hood) for 24 h. After the test, it shall be able to normally turn on and off, and shall comply with the specifications of 4.4 in this Standard. The voltage drop allows an increase of 20 %. The overcurrent test of the center box shall be carried out on a dedicated test stand which can automatically display the values. During the test, according to different product features and customer requirements, select corresponding load procedure and test load from Figure A.1 and Table B.1, apply the current of 1.1 times the rated value of the fuse, for 1 h. After the test, it shall comply with the specifications of 4.8 in this Standard.
5.9 Resistance to disruptive voltage strength test
When having resistance to disruptive voltage strength test, firstly put the center box into the hot and humid chamber, to keep 24 h in a condition with the temperature of 18 ??C ~ 28 ??C and the relative humidity of 90 % to 98 %; remove and replace it at the normal environment for 1 h; apply 50 Hz 1000 V actual sine wave voltage between mutually insulated conductive parts and between the conductive parts and the enclosure. The voltage applied at the beginning of the test shall be less than 500 V and then steadily increased to a full value for a period of not less tha...

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