JB/T 7237-2002 Test methods for three-wheeled agricultural transport vehicles
Some standard content:
ICS65.060
Machinery Industry Standard of the People's Republic of China
JB/T7237-2002
Replaces JB/T7237--1994
Three-wheel agricultural vehicles-Test method2002-12-27Promulgated
2003-04-01Implementation
Promulgated by the State Economic and Trade Commission of the People's Republic of ChinaPreliminary
2 Normative reference documents
3 Test conditions
3.1 General technical conditions
3.2 Measurement accuracy..
Selection of test method
3.4 Acceptance and running-in.
4 Determination of size and quality parameters
Determination conditions
Determination method.
Starting performance test
6 Dynamic performance test and sliding performance test
7 Maneuvering performance test,
Minimum turning circle diameter measurement
Steering wheel maximum free turning angle measurement
7.3 Steering wheel turning angle measurement
Maneuvering force measurement
8 Braking performance test
Driving braking performance
Parking braking performance
Driving braking and parking braking bench testRoad driving fuel consumption
Environmental pollution measurement.
Dumping cargo box performance test,
Lighting signal device test
Roll stability angle test.
Headlight performance and installation test
Rearview mirror test
Electric horn function and sound level test
Interior decoration material Flame retardancy of materials,
Reliability driving test,
Test form and test report
JB/T72372002
This standard is a revision of JB/T7237-1994 (Test method for three-wheeled agricultural transport vehicles).
Compared with JB/T72371994, the main changes of this standard are as follows: It focuses on the performance test of the whole vehicle and cancels the test method for components in the original standard; Adds the maximum self-electric steering angle measurement of the steering wheel: Adds the maximum steering angle measurement of the steering wheel:
Adds the control force measurement:
Supplements the environmental pollution measurement items:
-Adds the roll stability angle and self-unloading cargo box performance test:-Adds the rearview mirror test;
-Adds the electric horn function and sound level test: Adds the interior material Flame retardancy test of materials: This standard replaces JB/T7237-1994.
This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Agricultural Transport Vehicles. JB/T7237-2002
This standard was drafted by Shandong Agricultural Machinery Research Institute, Shandong Juli Co., Ltd., and Anhui Feicai (Group) Co., Ltd. The main drafters of this standard are: Wang Dongyue, Yue Chunqing, Han Hongmei, Xiong Junsong, and Chi Xiangli. This standard was first issued in 1994.
1 Scope
Test methods for three-wheeled agricultural transport vehicles
This standard specifies the performance tests and reliability test methods for three-wheeled agricultural transport vehicles. This standard applies to the whole vehicle test of three-wheeled agricultural transport vehicles (hereinafter referred to as three-wheeled vehicles). 2 Normative references||tt ||JB/T72372002
The clauses in the following documents become clauses of this standard through the reference of this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this standard. GB/T5373 Determination of dimensions and mass parameters of motorcycles and mopeds GB8410 Combustion characteristics of automotive interior materials GB/T15705 Dimensions of driver's operating position of trucks GB18320 Safety technical requirements for agricultural transport vehicles GB18322 Free acceleration smoke emission limits and measurement methods for agricultural transport vehicles GB/T19118
GB/T 19119
GB/T19124
GB/T19129
GB/T19133
Methods for measuring noise of agricultural transport vehicles
Agricultural transport vehicles
Regulations for the installation of lighting and signaling devices
Headlights
Agricultural transport vehicles
Electric horn performance and test methods
Agricultural transport vehicles
Test method for the maximum roll stability angle of agricultural transport vehiclesPerformance and installation requirements for rearview mirrors of agricultural transport vehiclesGB/T 191342
JB/T7235
Test methods for four-wheeled agricultural transport vehicles
JB/T7236—2001 Technical conditions for three-wheeled agricultural transport vehicles JB/T50096 Reliability assessment and evaluation methods for three-wheeled agricultural transport vehicles 3 Test conditions
3.1 General technical conditions
Unless otherwise specified, each test shall meet the following requirements. 3.1.1 The following items shall be consistent with the accompanying technical documents: The structure and performance of each assembly, accessory and auxiliary device of the tested three-wheeled vehicle: The technical status of the tested three-wheeled vehicle, the adjustment and operation methods of each part: The fuel, lubricating oil, coolant and other working fluids used during the test. 3.1.2 During the entire test period, except for routine maintenance and adjustment as specified in the instruction manual, no other adjustments or repairs are allowed. If necessary, the test organization shall agree and conduct the test under its supervision, and then re-test the relevant items, and record the details in the report. 3.1.3 The tire pressure during the test shall comply with the provisions of the accompanying technical documents or the requirements of the pressure marked on the tire, and the maximum error shall not exceed 10kPa. Except for the reliability test, the tires shall not have mud and oil. 3.1.4 Except for special provisions, the load during the test shall maintain the maximum factory-specified loading mass, and the load shall not change its mass and shape due to changes in climate and use conditions. The load shall be evenly placed in the car box, and the movement of the load shall be restricted. Its height shall not exceed the side panel of the car. The number of passengers (including the driver) on the car shall comply with the provisions of the accompanying technical documents, but heavy objects can be placed in the corresponding positions to replace the passengers, and each person shall be calculated as 65kg (55kg on the seat and 10kg on the front floor). JB/T7237—2002
3.1.5Except for the reliability test which is not restricted by climatic conditions and is otherwise specified, all other tests shall be conducted in rainless weather with a temperature of 0℃~40℃ and a wind speed of no more than 3m/s at a height of 1.2m from the ground (unless otherwise specified). Each test shall measure the temperature, wind speed and air pressure (applicable to plateau areas) at the beginning and end of the test, and report their ranges. 3.1.6Unless otherwise specified, the test shall be conducted on a clean, dry, flat asphalt or concrete road surface with a longitudinal slope of less than 0.1% and a transverse slope of no more than 0.3%. The length of the straight section shall be no less than 1000m and the width shall be no less than 8m. Tests that need to be conducted back and forth shall be conducted on the same road section as much as possible.
3.1.7Unless otherwise specified, before conducting each performance test, the three-wheeled vehicle to be tested shall be preheated so that all parts reach normal operating temperature. 3.1.8 For tricycles equipped with a cab, except for the reliability driving test where the windows can be opened, all other tests should be conducted with the doors and windows closed. 3.1.9 The accuracy of the instruments and equipment used in the test should meet the measurement accuracy requirements and be within the validity period of their calibration. 3.1.10 No additives should be added to the fuel, coolant and various lubricants used in the test. 3.1.11 The engine should be in normal working condition and the engine speed should meet the specified requirements. 3.1.12 All abnormal phenomena occurring during the test should be recorded in detail and written into the report. 3.2 Measurement accuracy
3.2.1 Unless otherwise specified, the accuracy of the measurement of various parameters shall meet the following requirements: distance 1%, control force 5%, quality 1% time 0.2%, torque 1%, speed 1%, vehicle speed 3%, oil pressure or air pressure 2%, ambient temperature 1℃, water temperature and oil temperature 2℃, angle 1", atmospheric pressure 0.2kPa, tire pressure 10kPa, noise level 1dB (A), and other 2%. 3.2.2 When recording the driving distance in thousands, only record it to the nearest integer. 3.3 Test method selection
When there are more than two test methods for the same test item in this standard, one of them can be selected according to the requirements or test equipment conditions. 3.4 Acceptance and running-in
3.4.1 The three-wheeled vehicle to be tested shall be fully inspected and accepted by the test responsible unit according to the acceptance technical conditions of the three-wheeled vehicle or the requirements of other relevant documents.
3.4.2 Before the test, the three-wheeled vehicle to be tested shall be run-in and maintained according to the provisions of the technical documents accompanying the vehicle. Except for the items that do not require running-in before testing.
4 Determination of dimensional and mass parameters
4.1 Determination conditions
4.1.1 Except for the commonly used tools on the vehicle, no overloaded goods, sundries, soil, etc. are allowed on the three-wheeled vehicle to be tested. 4.1.2 Fuel, lubricating oil, coolant and other working fluids shall be filled to the highest liquid level specified in the technical documents. 4.1.3 All adjustable or changeable parts that affect the external dimensions of the three-wheeled vehicle to be tested, such as the self-unloading cargo box, shall be in a stable state with the smallest external dimensions.
4.1.4 When measuring dimensional parameters, the three-wheeled vehicle to be tested shall be parked on a hard and level ground. The ground slope shall not exceed 0.3% within the test range and the ground flatness shall be within 3mm/m.
4.1.5 During the measurement, the vehicle under test is in a stationary state when driving in a straight line. 4.1.6 During the measurement, the engine is turned off, the gear lever is in the neutral position, the brake is released, and no pads are allowed. 4.2 Determination method
According to the provisions of GB/T5373 for Zhengzhou three-wheeled motorcycles. The dimensions of the driver's operating position of the steering handlebar tricycle are shown in Figure 1 of JB/T7236-2001, and the dimensions of the driver's operating position of the steering wheel tricycle are carried out in accordance with the provisions of GB/T15705. 5 Starting performance test
5.1 The test should be carried out after running-in, at normal temperature and pressure with an ambient temperature not lower than 5℃, and the engine and cooling water are not preheated. 5.2 The starting time is the time from the start of starting (hand cranking or pressing the button) to the end of the engine running automatically. The electric starting time is not more than 30s, and the hand cranking time is not more than 15s, which means the start is successful. After the successful start, start the engine immediately, start again and stop after 2 minutes, repeat twice. 2
JB/T7237—2002
5.3 From the start to the stop of the broadcasting vehicle or the pressing of the button, if the engine fails to run automatically or the starting time exceeds the specified time, it is considered a start failure. 5.4 Two successful starts out of three consecutive starts are considered a successful start. 6 Power performance test and sliding performance test
The test should be carried out after running-in.
Carry out in accordance with the provisions of JB/T7235.
7 Maneuverability test
7.1 Minimum turning circle diameter measurement
The tricycle is unloaded and in the lowest gear, and it drives at a stable low speed. The steering wheel (or steering handle) is turned to the extreme position in one direction. At the same time, the contact point between the symmetrical center plane of the front wheel and the ground is marked on the ground. After driving a full circle, exit the test site and use a tape measure to measure the diameter of the track circle in three evenly distributed directions and take the average value. The measurement should be carried out in the left and right directions respectively, twice each, and the average value should be taken. The larger value of turning left or right is the minimum turning circle diameter of the vehicle. 7.2 Measurement of the maximum free turning angle of the steering wheel
72.1 The test vehicle is stationary and the steering wheel is in a straight-line driving state. 7.2.2 The steering wheel is turned left and right respectively until the resistance increases significantly (the steering wheel begins to turn), and the steering wheel angle is measured. 7.3 Measurement of steering wheel angle
7.3.1 The test vehicle is stationary and the steering wheel is in a straight-line driving stationary state. 7.3.2 The steering wheel (handle) is turned left and right to the extreme position respectively, and the steering wheel angle is measured. 7.4 Control force measurement
7.4.1 Measurement of the control force of the brake, clutch and other control levers The control force of each control mechanism is measured using different types of dynamometers. During the measurement, the three-wheeled vehicle under test is in a stationary state. The minimum control force required to smoothly move each control mechanism to its working position is measured respectively. The force point is the midpoint of the driver's normal control position.
7.4.2 Measurement of control force for straight-line driving
7.4.2.1 A straight section of 200m in length is marked in the middle of the test road as the test area. There should be an appropriate distance between the two ends of the test area so that the three-wheeled vehicle under test can reach a speed of 25km/h before reaching the test area. 7.4.2.2 The three-wheeled vehicle under test is unloaded, and a steering force measuring device is installed (installed). The vehicle is driven straight through the test area at a stable speed of 25km/h ± 0.5km/h, and the maximum control force in the test area is recorded. The round trip is measured twice each and the average value is taken. 7.4.3 Measurement of steering control force
7.4.3.1 A semicircle with a radius of 4.5m and a straight-line section are drawn on the test site, as shown in Figure 1. A
7.4.3.2 The three-wheeled vehicle to be tested is unloaded, and is equipped with (or equipped with) a steering angle force meter with a diameter of 400 mm. It is driven at a steady speed of 10 km/h ± 0.5 km/h so that the center plane of the front wheel follows the route shown in Figure 1. It turns from a straight-line driving state to a 180° U-turn and then returns in a straight line. The maximum steering force in the measurement areas A and B is recorded. The test is carried out in the left turn and right turn directions, and each direction is measured twice, and the average value is taken. 3
JB/T7237—2002
8 Braking performance test
The test should be carried out after running-in:
8.1 Driving braking performance
8.1.1 When the maximum design speed of the three-wheeled vehicle under test is less than 40km/h, a straight section with a length of 20m and a width of 2.3m is marked out in the middle of the test road as the test area. When the maximum design speed of the three-wheeled vehicle under test is greater than or equal to 40km/h, a straight section with a length of 20m and a width of 2.5m is marked out in the middle of the test road as the test area. There should be an appropriate distance between the two ends of the test area so that the three-wheeled vehicle under test can reach the specified speed before arriving at the test area. 8.1.2 The brake drum of the tested tricycle is in a cold state (below 100℃). The tested tricycle with a maximum design speed of less than 40km/h drives at a steady speed of 30km/h along the center line of the test area. After arriving at the test area, quickly step on the clutch pedal and brake pedal for emergency braking until the vehicle stops completely, and then put the gear lever in neutral. Measure and record the initial braking speed and braking distance, and measure the brake pedal force at the same time. The test should be carried out twice in both directions and the average value should be taken. The steering wheel (or steering handle) should not be turned during the braking test. Observe whether any part of the tested tricycle exceeds the width of the test track. 8.2 Parking Brake Performance
The unloaded tricycle is driven onto a smooth, clean, dry cement or asphalt road with a slope of 20% and braked to a stop. The force measuring device is placed on the parking control handle to measure the braking force in advance. The parking control handle is moved to the maximum working position, then the vehicle is put into neutral, the foot brake is released and the engine is turned off. The parking mark line is drawn at the maximum outer diameter of the rear tire and the contact point with the ground. After 5 minutes, the rotational angular displacement of the outer diameter of the rear tire and the relative displacement with the ground are measured. Then the tricycle is turned 180", and the above test is repeated. 8.3 The bench test of service brake and parking brake shall be carried out in accordance with the provisions of GB18320.
9 Fuel consumption of road driving
The test road shall be a highway of Class III or above (including Class III). The test road shall be selected with less traffic, small slope, accurate one-way monuments, and a length of more than 25 km section, under normal traffic conditions, the three-wheeled vehicle under test is driven in the normal way, and its average speed should not be less than 60% of the maximum speed. It is driven back and forth once on the 25km section, and the total fuel consumption and driving time are measured. If it is necessary to stop during driving, the engine should be turned off, and it is not allowed to idle for a long time. The parking time is recorded. Use one of the following methods to measure the fuel consumption: One is to use a fuel flow meter, the unit is mL:
Before the test, fill the fuel tank with fuel on flat ground, and use a measuring stick to measure the fuel filled in the tank after driving. The scale of the measuring stick is in mL: One is to use an auxiliary fuel tank, and the difference in the total mass of the auxiliary fuel tank (including fuel) is weighed before and after the test, and then converted into volume according to the actual density.
Calculate the fuel consumption per 100 kilometers and the fuel consumption per ton per 100 kilometers according to formula (1) and formula (2) respectively: Grs = VIs X 100-..
8m=Grs/m,X1000*
Where:
Fuel consumption per 100 kilometers, unit is L/100km
-Fuel consumption passing through the test area, unit is L; length of the test area, unit is km
Fuel consumption per 100 tons of weight, unit is L/(t·100km): total mass of the tested tricycle, unit is kg. 10 Environmental pollution measurement
Media noise measurement is carried out in accordance with the provisions of GB/T19118. The free acceleration smoke density measurement is carried out in accordance with the provisions of GB18322. (1)
Self-unloading cargo box performance test
This test is carried out on tricycles with self-unloading cargo boxes. It is carried out in accordance with the provisions of JB/T7235. 12
Lighting signal device test
It is carried out in accordance with the relevant provisions of GB/T19119.
13Roll stability angle test
Perform according to the provisions of GB/T19133.
14Headlamp performance and installation testbzxZ.net
Perform according to the relevant provisions of GB/T19124 and GB/T19119. Rearview mirror test
Perform according to the provisions of GB/T-49134.
16Electric horn function and sound level test
Perform according to the provisions of GB/T19129.
17Flame retardancy of interior materials
Perform according to the provisions of GB8410.
18Reliability driving test
JB/T7237—2002
Except that the test driving mileage shall comply with the provisions of Table 1, the rest shall be carried out in accordance with the provisions of JB/T7235 and JB/T50096. 18.1
Maximum speed km/h
Reliability test mileage
>30~40
>40~50
15 000
Note: If the basic model corresponding to the modified vehicle has a reliability test report that meets the requirements and is recognized by the inspection department, the reliability mileage can be 5000km. When conducting reliability enhancement tests, the load weight and one-way travel of the three-wheeled vehicle shall comply with relevant regulations. 18.2
Test form and test report
Refer to the provisions of JB/T7235,
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