This standard specifies the measurement conditions, measurement methods and value rules for the dimensions and mass parameters of motorcycles and mopeds. This standard applies to the determination of dimensions and mass parameters of motorcycles and mopeds. GB/T 5373-1994 Determination methods for dimensions and mass parameters of motorcycles and mopeds GB/T5373-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Measuring method of dimenslons and massesparameter for motorcycles and mopedsSubject content and scope of application
GB/T 5373 ---94
Replaces GB5373-85
This standard specifies the measuring conditions, measuring methods and value-taking rules for the dimensions and mass parameters of motorcycles and mopeds. This standard applies to the determination of the dimensions and mass parameters of motorcycles and mopeds. Cited Standards
GB5359.3—1996Terms for Motorcycles and Mopeds GB 5359. 5--1996
Terms for Motorcycles and Mopeds
GB5359.6—1996Terms for Motorcycles and Mopeds GB 5359.7—1996
Terms for Motorcycles and Mopeds
GB8170 Rules for Rounding Off Numerical Values
3 General Measurement Conditions
Dimensions of Two-Wheeled Vehicles
Mass of Two-Wheeled Vehicles
Mass of Three-Wheeled Vehicles
Dimensions of Three-Wheeled Vehicles
3.1 The vehicle to be measured must be clean (free of oil and dirt), fully equipped, and the tire pressure must meet the requirements of the vehicle's technical conditions. 3.2 The supporting surface for measuring dimensions should be a horizontal measuring platform or terrazzo floor. 3.3 The vehicle is placed on the support plane, the wheels are in a straight driving position, the two-wheeled vehicle is in a vertical state, the doors and windows of the three-wheeled vehicle should be closed, and the side windshield of the side three-wheeled vehicle should be placed in the working position. 3.4
Measuring instruments and equipment
Steel tape measure: reading resolution 1mm;
Angle ruler: reading resolution 5°;
Height ruler: reading resolution 0.5mm;
Weight hammer or square ruler;
Three-dimensional coordinate device;
Electronic scale or lever-bowl platform scale, reading resolution 0.2kg; Pad;
Adjustable level;
Suspension locking tool.
3.5 The vehicle loading mass shall be in accordance with the manufacturer's regulations. The total mass of the driver (passenger) and his equipment is stipulated to be 75kg. If it is less than 75kg, a counterweight should be added to the corresponding seat position, and the goods should be loaded in the specified position. Approved by the State Administration of Technical Supervision on December 27, 1994, 92
Implemented on July 1, 1995
4 Measurement methods for dimensional parameters
4.1 Measurement conditions
GB/T5373-94
4.1.1 The definition of vehicle dimensions shall comply with the provisions of GB5359.3 and GB5359.7, and shall be placed in a three-dimensional orthogonal coordinate system to determine its measurement base plane and longitudinal center plane.
4.1.2 The site and road used to measure the turning circle, turning channel circle diameter and wheel rolling radius shall be clean, flat, dry concrete or asphalt ground.
4.2 Measurement items and measurement requirements
4.2.1 See Table 1 for length dimensions.
Measurement Items
Front and rear axles
Front and side axles
Distance between ground clearance point and rear wheel axis
Inner length of vehicle compartment
Width dimensions are shown in Table 2.
Measurement Items
Inner edge width of front turn signal lamp
Inner edge width of rear turn signal lamp
Inner width of vehicle compartment
Measure the distance between two vertical planes perpendicular to the longitudinal center plane and respectively against the front and rear ends of the vehicle. Spare wheel and rearview mirror excluded. Measure the distance between two vertical planes passing through the center of two wheels and perpendicular to the longitudinal center plane and the support plane. Measure the distance between the vertical line passing through the intersection of the axis of the steering column and the support plane to the center of the front wheel. Measure the distance between the center of the front wheel and the vertical plane perpendicular to the longitudinal center plane against the front end of the vehicle (including additional rigid parts). Measure the distance between the center of the rear wheel and the vertical plane perpendicular to the longitudinal center plane against the rear end of the vehicle (including additional rigid parts). Measure the distance between the ground clearance point and the rear wheel axis. When there is more than one point of the lowest clearance point, the point close to the center of the two wheels should be measured. Measure the maximum dimension in the length direction of the interior of the vehicle. Table 2. Measure the distance between two planes parallel to the longitudinal center plane and against the two sides of the vehicle respectively. Except for rearview mirrors a. For three-wheeled vehicles: measure the sum of the distances from the centers of the two wheels on the same axis to the longitudinal center plane
b. For sidecars, measure the distance from the center of the side wheels to the longitudinal center plane
a. For three-wheeled vehicles, toe-in: the total mass of the outer wheels of the rims at both ends of the same axis
vehicle
mass status
vehicle
factory-specified maximum
total mass
The endpoints of the horizontal diameter of the corridor are the vertices of the isosceles trapezoid, and the difference in the length of the front and rear bases (b1, hz) of the trapezoid is measured, b.Toe-in of sidecar tricycle: The end point of the horizontal diameter of the outer contour line of the sidecar rim to the vertical line of the longitudinal center plane is a trapezoid, and the difference in the length of the front and rear bottom sides (hb2) of the trapezoid is measured. The distance between the inner edges of the left and right front turn signals is measured. The distance between the inner edges of the left and right rear turn signals is measured. The maximum dimension in the width direction of the interior of the vehicle. The height of the vehicle is shown in Table 3.
Measurement items
Ground clearance
Height from the center of the headlight source to the ground
GB/T5373—94
Measure the distance between the horizontal surface in contact with the top of the vehicle and the supporting surface. Excluding rearview mirrors
Measure the distance from the lowest point of the vehicle within the wheelbase to the supporting surface, excluding wheels and fenders
Measure the distance from the center of the headlight source to the supporting planeHeight from the center of the front turn light source to the ground
Measure the distance from the center of the left and right front turn light source to the supporting planeHeight from the center of the rear turn light source to the groundMeasure the distance from the center of the left and right rear turn light source to the supporting planeInterior height of the vehicle
Measure the maximum dimension of the interior height of the vehicle Note: For the height from the center of the front and rear turn light sources to the ground, take the arithmetic average of the left and right measuring disc values. See Table 4 for angles.
Measurement items
Steering handle
Steering angle
Left turn α
Right turn α
Main vehicle camber angle
Tilt angle
Approach angle
Departure angle
Follow angle
Measure the left and right maximum steering angles of the steering handle in the plane perpendicular to the axis of the steering column. Measure the acute angle between the plane passing through the center of the front wheel and parallel to the X plane (the plane perpendicular to the horizontal plane and the plumb plane) from the longitudinal center plane of the vehicle (the sidecar from the main wheel center plane) to the left and right extreme positions. Measure the acute angle between the plane passing through the axis of the steering column and perpendicular to the plumb plane and the plane passing through the center of the front wheel and parallel to the X plane (the plane perpendicular to the horizontal plane and the plumb plane) Measure the maximum angle between the plane tangent to the rigid components on the sides of the front and rear wheels of the two-wheeled vehicle and the body and perpendicular to the X plane and the support surface. If the front and rear wheels are different, take the smaller angle. Factory-specified maximum
Measure the maximum angle between the plane perpendicular to the longitudinal center plane and tangent to the front wheel and the frontmost rigid component of the vehicle and the support surface. No rigid component is allowed within this total mass angle
Measure the maximum angle between the plane perpendicular to the longitudinal center plane and tangent to the rear wheel and the rearmost rigid component of the vehicle and the support surface. No rigid component is allowed within this angle
Measure the minimum angle between the two planes perpendicular to the longitudinal center plane and tangent to the front and rear wheels of the vehicle when the intersection line contacts the bottom of the vehicle within the wheelbase
See Figures 1 to 3
See Figures 1 to 3
See Figures 1 to 3
See Figures 2
See Figure 1
See Figure ? bZxz.net
See Figure 6
Other dimensions are shown in Table 5.
Measurement Items
Left turn dz
Turning circle diameter
Right turn d,
Left outer dw
Turning channel
Circle diameter
Static
Radius of wheel
Left inner dm
Right outer dyw
Right inner dyn
Rolling radius of wheel
GB/T5373
a, Two-wheeled vehicle: Measure the diameter of the circle tangent to the center plane of the front wheel on the support surface when the steering wheel is turned to the left or right limit position. b. Three-wheeled vehicle: Measure the diameter of the circle tangent to the center plane of the front wheel on the support surface when the steering wheel is turned to the left or right limit position. The diameter of the largest circle tangent to the wheel center plane on the bearing surface
Measure the diameter of the largest and smallest circles drawn by the outer and inner sides of the projections of all vehicle parts on the bearing surface when the steering wheel is turned to the extreme position.
Mass state
Factory-specified maximum
Total mass
Vehicle mass
Under the vehicle dry mass or factory-specified maximum total mass state, measure the distance from the wheel axle to the bearing surface respectively
Measure the radius of the driving wheel when moving
Factory-specified maximum
Total mass
See Figures 8 to 11
See Figure 6
GB/T 5373—94
GB/T 5373--94
GB/T 5373—94
4.3 Measurement methods
4.3.1 Determination of linear dimensions
GB/T 5373 -- 94
4.3.1.1 Length, measured in the direction parallel to the support surface and the longitudinal center plane. 4.3.1.2 Width, measured in the direction perpendicular to the longitudinal center plane. 4.3.1.3 Height, measured in the direction perpendicular to the support plane. 4.3.2 Determination of tilt angle
4.3.2.1 Use a locking tool to fix the front and rear suspension springs of the vehicle to be tested in the compressed position. If the spring preload in the suspension system is adjustable, it should be adjusted to the most unfavorable state when the vehicle is tilted and fixed, and then the load should be removed. 4.3.2.2 Determine the left and right tilt angles of the vehicle according to the method shown in Figure 5. Figure 5
4.3.3 Determination of the passing angle
Based on the position of the ground clearance point measured on the vehicle, the wheelbase and the static radius of the wheel at the factory-specified maximum total mass, determine the passing angle by the graphical method according to Figure 6 or calculate it according to formula (1):
go-arcsin
hi =rjei-Hi
Wherein: Ls
+arcsin
Distance from the ground clearance point to the rear wheel axis, mm; h
(arctg
+arctg
h2=rjr2—Hi
Crossover angle, (°);
GB/T5373—94
Front wheel static radius of maximum total mass specified by the factory, mm, ground clearance, mm;
Front wheel static radius of maximum total mass specified by the factory, mm; front and rear wheel wheelbase, mm.
Note: When the ground clearance point is not at the center of the wheelbase, the crossover angle should also be measured or calculated for the center and other departure points on both sides that are slightly higher than the lowest departure point. The minimum value measured or calculated is taken as the crossover angle. 4.3.4 Determination of approach angle and departure angle
As shown in Figure 7, use a measuring plate with two parallel surfaces to make it perpendicular to the longitudinal center plane of the vehicle. It is tangent to the front wheel (or rear wheel) and in contact with the rigid parts inside the front end (or rear end). Then use a protractor to measure the angle between the plate and the supporting surface. 4.3.5 Determination of turning circle diameter and turning channel circle diameter 4.3.5.1 Use the imprint method, projection marking or spray printing method to clearly display the running track of the vehicle measurement point on the ground. 4.3.5.2 Turn the steering wheel to the left or right to the extreme position, and push or drive the vehicle for one circle. The two-wheeled vehicle should keep the body perpendicular to the ground while moving.
4.3.5.3 Measure each track circle as shown in Figures 8 to 11, measure three times and take the arithmetic average, accurate to 10mm. Figure 8
GB/T 5373—94
GB/T 5373—94
4.3.6 Determination of wheel rolling radius
4.3.6.1 Use the imprint method to measure the rolling circumference of the driving wheel. After applying a line of about 10 mm in width perpendicular to the driving direction on the test road with an imprint, push the vehicle forward in a straight line or drive at the lowest speed, and measure the rolling distance shown by the imprint of the driving wheel. According to the clarity of the imprint, measure as many weeks as possible.
4.3.5.2 Calculate the rolling radius rg according to formula (2): 2 yuan
-measured rolling distance, mm;
Where: s—
rolling Number of laps.
Note: For a three-wheeled vehicle, s is the arithmetic mean of the left and right driving wheels. 5 Methods of measuring mass parameters
(2)
5.1 Measurement conditions
5.1.1 The definition of vehicle mass shall comply with the provisions of GB5359.5 and GB5359.6, and the gearbox shall be in neutral and the brakes shall not be used.
When measuring the center of mass position under the factory-specified maximum total mass, the driver and passenger may be replaced by a simulated dummy and fixed to the vehicle as a whole, and ensure that no displacement or change of posture occurs during the measurement process. 5.2 Position of the simulated dummy
5.2.1 The simulated driver's hands should be placed on the steering handle and his feet should be placed on the footrests, with the feet and calves at 90°±5°. 5.2.2 The simulated passenger's hands should be placed on the specified handrails and his feet should be placed on the footrests or footrests, maintaining the usual posture of ordinary passengers.
5.3 Determination of the distributed mass of each wheel
5.3.1 Use two (or three) platform scales or electronic platform scales (the supporting surfaces of each scale should be in the same horizontal plane) to weigh the dry mass of the whole vehicle and the distributed mass of each wheel under the factory-specified maximum total mass state. 102
5.3.2 Calculate the following values ​​of the total mass m of two-wheeled and three-wheeled vehicles based on the distributed mass of each wheel:
Total mass m of sidecar;
GB/T5373--94
m=m+mz
m--m+mam3
Distributed mass measured by the front wheel when the vehicle is dry mass (factory-determined maximum total mass), kg; where: mi-—
-Distributed mass measured by the rear wheel when the vehicle is dry mass (factory-determined maximum total mass), kg; Distributed mass measured by the side wheel when the vehicle is dry mass (factory-determined maximum total mass), kg. Note: The distributed mass measured by the rear wheel of a three-wheeled vehicle is the sum of the weighing values ​​of the left and right wheels. 5.4 Determination of the center of mass of the vehicle in the horizontal plane (3)
(4)
Based on the principle that the center of gravity and the center of mass of the same object at the same position coincide, the horizontal coordinate position of the center of mass is measured using the method and principle of measuring the center of gravity of the object, see Figure 12.
mg m3g m28
Distance L between the center of mass of a two-wheeled or three-wheeled vehicle and the front wheel axis. : mz
Distance Lg between the center of mass of a sidecar and the front wheel axis: L.
Distance B between the center of mass of a sidecar and the longitudinal center plane: Li+m·L
Front and rear wheel wheelbases when the vehicle is dry (factory-specified maximum total mass), mm; where: L-
(m1+m2)g
(5)
(6)
(7))
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