GB 34659-2017 PDF in English
GB 34659-2017 (GB34659-2017) PDF English
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Requirements and test methods relating to the spray-suppression systems of motor vehicles and their trailers
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Standards related to (historical): GB 34659-2017
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GB 34659-2017: PDF in English GB 34659-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
T 26
Requirements and test methods relating to the spray-
suppression systems of motor vehicles and their trailers
ISSUED ON. NOVEMBER 1, 2017
IMPLEMENTED ON. JANUARY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope .. 4
2 Normative references ... 5
3 Terms and Definitions ... 5
4 Technical requirements for spray-suppression devices ... 8
5 Requirements for vehicles .. 9
6 Particular requirements for spray-suppression systems ... 10
7 Measuring Methods .. 15
Annex A (Normative) Measuring method of the energy absorbing type of
spray-suppression devices ... 16
Annex B (Normative) Measuring method of the air/water separation type of
spray-suppression devices ... 19
Annex C (Normative) Diagram of the dimensions and positions of spray-
suppression systems and test equipment .. 21
Foreword
All technical content of this Standard is compulsory.
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Attention is drawn to the possibility that some of the elements of this document may
be the subject of patent rights. The issuer of this document shall not be held
responsible for identifying any or all such patent rights.
This Standard was proposed by and shall be under the jurisdiction of the Ministry of
Industry and Information Technology of the People’s Republic of China
The drafting organizations of this Standard. Dongfeng Motor Corporation, National
Passenger Car Quality Supervision and Inspection Center, China FAW Group
Corporation R&D Center, China Quality Certification Center, Hubei Qixing Autobody
Co., Ltd.
The main drafters of this Standard. Hou Cuihua, Zhang Shangjiao, Ma Wei, Yu Boying,
Liu Liya, Sun Lei, Qu Yanping, Wang Sheng, Peng Liying, Zhang Ming, Guo Maolin,
Zhou Yanling.
Requirements and test methods relating to the spray-
suppression systems of motor vehicles and their trailers
1 Scope
This Standard specifies the performance requirements and test methods of the spray-
suppression systems of motor vehicles and their trailers.
This Standard applies to.
a) the spray-suppression systems which are installed on the vehicles of categories
N and O;
b) the complete vehicles of categories N and O on which the spray-suppression
systems defined in 3.1 are installed;
c) the wheels which is covered by driver's cab for the vehicle chassis having a
driver’s cab;
d) the vehicles of category N1, and the vehicles of category N2 whose designed
permissible maximum laden mass is not greater than 7 500 kg. The requirements
of this Standard may be deemed to have been met if they are installed with the
wheel guards specified in GB 7063.
This Standard does not apply to the vehicles of category G which are defined in GB/T
15089.
The installation of the spray-suppression devices defined in 3.2 of this Standard is
voluntary for the following vehicles; and if these vehicles are installed with the spray-
suppression devices, then the requirements of this Standard shall be met.
a) the categories N1, O1, O2 vehicles of which the permissible maximum laden mass
is not greater than 7 500 kg;
b) for the vehicle chassis having a driver’s cab, the wheels which are not covered
by driver’s cab;
c) the chassis having no driver’s cab;
d) the vehicles on which it is impossible to install the spray-suppression devices
under normal service conditions.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to This Standard.
GB/T 3730.1, Motor vehicles and trailers - Types - Terms and definitions
GB 7063, The wheel guards of motor vehicles
GB/T 15089, Classification of power-driven vehicles and trailers
3 Terms and Definitions
For the purposes of this document, the following terms and definitions and those
defined in GB/T 3730.1 and GB/T 15089 apply.
3.1
spray-suppression system
A system which is used to reduce water sprayed from tires during vehicle operation. A
spray-suppression system usually comprises mud guard, outer valance and rain flap.
3.2
spray-suppression device
It is a part of spray-suppression system which includes the following two parts.
3.2.1 air/water separator
It constitutes a part of outer valance and/or rain flap, which can let air through and
reduce water mist spray.
3.2.2
energy absorber
A part of mud guard, and/or outer valance, and/or rain flap, which can absorb the
energy of water spray to reduce water mist spray.
3.3
mud guard
6.1.2.4 When vehicles are running, no opening of spray overflow is allowed, which is
located within outer valances or between outer valances and other parts of mud guards.
6.1.2.5 When outer valances comprise different components in relative movement,
the compliance with the requirements of 6.1.2.3 and 6.1.2.4 is not necessary in local
areas.
6.1.2.6 For semitrailer towing vehicles whose chassis is low, i.e. the height of saddle
is not greater than 1 100 mm, the compliance with the requirements of 6.1.1.1a),
6.1.1.3 and 6.1.2.4 is not necessary.
When a towing vehicle is connected with a trailer, it is not necessary for mud guards
and outer valances to cover the top of rear axle tires to prevent damages of the spray-
suppression devices.
Within the tire areas where the vertical lines going through wheel center are greater
than 60° in both forward and backward directions, mud guards and outer valances of
vehicles shall meet the requirements of 6.1.1 and 6.1.2.
When these vehicles are operating in the status of towing semitrailers, the design of
vehicles shall ensure they meet the requirements of 6.1.2. The manufacturer can take
appropriate measures for mud guards and outer valances to conform to the
requirements of this Clause, e.g. a detachable part is contained.
6.1.3 Rain flap
6.1.3.1 The width of rain flaps shall meet the requirements of 6.1.1.1c) for “q”; except
that rain flaps are located within mud guards, the width of rain flaps then is not smaller
than the width of the tread of tires. The width of rain flaps beneath mud guards shall
meet the requirements of this clause, with the deviation of each side not greater than
10 mm.
6.1.3.2 The orientations of rain flaps shall be basically vertical.
6.1.3.3 The distance between the lower edge of rain flaps and the ground is not
greater than 200 mm (see Figure C.4).
When the radial distance Rv of the lower edge of the last axle’s outer valances is not
greater than the radius of tires which are installed on the axle, the distance may be
improved to 300 mm.
If rain flaps technically influence the performance of suspension, the maximum height
of their lower end may be improved to 300 mm.
6.1.3.4 The horizontal distance between rain flaps and last edge of tires shall not
exceed 300 mm.
6.1.3.5 For multiple axles that the distance “d” between adjacent axle tires is less
than 250 mm, only the last group of wheels shall be installed with rain flaps. When the
installed which meet the requirements of 4.1.
6.2.3 Rain flap
Rain flaps shall extend to the lower part of mud guards and meet the requirements of
6.1.3.1 to 6.1.3.9.
6.3 Requirements for the air/water separation type of spray-suppression
systems on axles where steered or non-steered wheels are installed
6.3.1 Mud guard
6.3.1.1 Mud guards shall meet the requirements of 6.1.1.1c).
6.3.1.2 For single axles or multiple axles that the distance “d” between adjacent axle
tires is greater than 300 mm, mud guards shall meet the requirements of 6.1.1.1a).
6.3.1.3 If the distance “d” between adjacent axle tires is not greater than 300 mm,
mud guards shall meet the requirements shown in Figure C.8.
6.3.2 Outer valance
6.3.2.1 The lower edge of outer valances shall be installed with an air/water
separation spray-suppression device which meets the requirements of 4.2.
6.3.2.2 For single axles or multiple axles that the distance “d” between adjacent axle
tires is greater than 300 mm (see Figures C.7 and C.8), the lower edge of the spray-
suppression device installed to the outer valances shall have the following maximum
dimensions and radii when measurement is conducted from wheel center.
a) axles which are installed with steered or self-steered wheels. from the front edge
(peak C at 30°) to the rear edge (peak A at 100 mm), Rv ≤ 1.05 R;
b) axles which are installed...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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