GB/T 5373-2019 English PDF (GBT5373-2019)

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GB/T 5373-2019: Measuring method of dimensions and masses parameter for motorcycles and mopeds
GB/T 5373-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.140
T 80
Replacing GB/T 5373-2006
Measuring method of dimensions and masses
parameter for motorcycles and mopeds
ISSUED ON: DECEMBER 10, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Basic measuring requirements ... 6 
5 Measurement of dimensions parameter ... 7 
6 Measurement of mass parameters ... 23 
7 Measurement results and value rules for measurement data ... 29 
Annex A (informative) Recording table for vehicle size parameter measurement
... 31 
Annex B (informative) Recording table for vehicle mass parameter
measurement ... 33 
Annex C (informative) Recording table for vehicle centroid height ... 34 
Measuring method of dimensions and masses
parameter for motorcycles and mopeds
1 Scope
This Standard specifies measuring conditions, measuring methods and value
taking rules for dimensions and masses parameter for motorcycles and mopeds.
This Standard is applicable to motorcycles and mopeds (hereinafter referred to
as “the vehicle”).
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 3730.3, Motor vehicles and towed vehicles - Dimensions of vehicles -
Terms and definitions
GB/T 5359.1, Term for motorcycles and mopeds - Part 1: Types of vehicles
GB/T 5359.3, Term for motorcycles and mopeds - Part 3: Dimensions of
vehicle with two and three wheels
GB/T 5359.4, Term for motorcycles and mopeds - Part 4: Mass of vehicle
with two and three wheels
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T
3730.3, GB/T 5359.1, GB/T 5359.3 and GB/T 5359.4 as well as the followings
apply.
3.1 wheel center
the intersection of the longitudinal center plane of the wheel and the center of
rotation of the wheel
3.2 optional parts
in addition to the basic motorcycles provided by the manufacturer, the
attachment that can be added or selected as an option for customers
3.3 standard parts
among the basic motorcycles provided by the manufacturer, the attachment that
has already been used as a vehicle design standard configuration
3.4 attachment
parts that play an auxiliary role but will not affect the normal driving of the
motorcycle after disassembly [such as air deflector, wind deflector, bumper,
backrest, cargo basket, front (rear) shelf, rear luggage]
3.5 axle load specific value
the ratio of each wheel axle load to the curb weight of the whole vehicle
4 Basic measuring requirements
4.1 The vehicle shall be clean (no oil, dirt). The equipment shall be complete.
The tire pressure is in accordance with the product technical documents.
4.2 The vehicle rests on the supporting plane in a vertical state. The wheels are
in a straight running line. If there is a wind shield, the wind shield shall be placed
in the working position; the retractable windshield shall be placed in the highest
position. The doors and windows of the right three-wheeled motorcycle shall be
closed.
4.3 Measuring instruments and equipment are as follows:
a) Steel tape: scale interval is 1mm;
b) Angle meter: scale interval is 5';
c) Height ruler: scale interval is 0.5mm;
d) Heavy hammer or square;
e) Three-dimensional coordinate measuring device;
f) Scale or electronic scale or vehicle load meter: scale interval is 0.2kg;
product technical documents. The occupant shall sit in the driving position of
the vehicle in a normal driving position. The load shall be placed in the specified
position. The total mass of the driver and his equipment is specified as 75kg.
When it is less than 75kg, a counterweight shall be added to the corresponding
seating position.
6.1.2 When measuring, the gearbox is placed in neutral. The brakes must not
be used.
6.1.3 When determining the position of the center of mass in the case of factory-
defined maximum total mass, the driver and occupant can be replaced by
dummy. And fix them as one with the vehicle. Ensure that no displacement or
change of posture occurs during the measurement process.
6.2 Driver and occupant positions
6.2.1 The driver’s hands shall be placed on the direction grips. Feet shall be
placed on the pedals. The feet and calves form 90°±5°. For vehicles with foot
pedals, the position of the feet shall be in accordance with the manufacturer's
regulations.
6.2.2 The occupant's hands shall be placed at the prescribed handrails. Feet
shall be placed on a footrest or pedal. Maintain the habitual posture of ordinary
occupants.
6.3 Vehicle dry mass, vehicle curb weight, and factory-specified maximum
total mass
6.3.1 Determine the distributed mass of each wheel: According to states of
vehicle dry mass, vehicle curb weight, and factory-specified maximum total
mass, use two (or three) scales or electronic scales (the supporting table of
each scale shall be in the same horizontal plane), to respectively weigh the
distributed mass of each wheel.
6.3.2 Calculate the vehicle mass m under the following conditions according to
the distributed mass of each wheel:
The vehicle dry mass / vehicle curb weight / factory-specified maximum total
mass of two-wheeled motorcycle and regular three-wheeled motorcycle is
calculated according to formula (3):
The vehicle dry mass / vehicle curb weight / factory-specified maximum total
mass of motorcycle with sidecar is calculated according to formula (4):
- After raising the wheel, distributed mass of front wheel when vehicle
dry mass / factory-specified maximum total mass, in kilograms (kg);
- After raising the wheel, distributed mass of rear wheel when vehicle
dry mass / factory-specified maximum total mass, in kilograms (kg);
m1 - Distributed mass of front wheel when vehicle dry mass / factory-
specified maximum total mass, in kilograms (kg);
m2 - Distributed mass of rear wheel when vehicle dry mass / factory-specified
maximum total mass, in kilograms (kg);
α - After raising the wheel, measured vehicle tilt angle, in degrees (°).
After raising the wheel, the weight of the wheel suspension locking tool shall be
subtracted from the reading value of the non-elevating wheel.
7 Measurement results and value rules for
measurement data
7.1 Measurement results
7.1.1 Fill in the record form after measuring the size parameters. See Annex A.
7.1.2 Fill in the record form after mass parameter measurement. See Annex B.
7.1.3 Fill in the record form after vehicle centroid height is measured. See Annex
C.
7.2 Value rules for measurement data
7.2.1 The effective value of the measured data and the effective value of the
calculated data are in accordance with Table 6.