QC/T 1057-2017Anti-skid chains for automobiles (English PDF)

4.1 General requirements

4.1.1 The appearance of automobile snow chains should be complete, without cracks and delamination, and there should be no sharp corners that damage the road surface; the surface of the snow chains should be free of rust Corrosion, no plating fall-off, no cracks, no extrusion deformation; should be assembled tightly.

4.1.2 The loading and unloading of automobile snow chains should be quick and convenient.

4.1.3 The automobile snow chains should not damage the tires during installation, use and removal.

4.1.4 After the car snow chain is installed, the side surface protruding from the inner side of the tire should not be larger than 20mm, and the side surface protruding from the outer side of the tire should not be large To 25 mm.

4.1.5 After the car snow chain is installed, it should not interfere with the vehicle during driving.

4.2 Performance requirements

4.2.1 Braking performance requirements

When testing in accordance with 5.2, the MFDDCMFDD of a vehicle snow chain test vehicle installed on a compacted snow straight road is sufficient for vehicle braking The average deceleration issued, see GB 21670) and the MFDD ratio of the same test vehicle without a car snow chain should be not less than 1.3.

MFDD of an automobile snow chain test vehicle installed on an ice straight road and MFDD of an automobile snow chain-free vehicle installed in the same test vehicle The ratio should be no less than 1.3.

4.2.2 Traction performance requirements

When tested in accordance with 5.3, the maximum traction of a vehicle snow chain test vehicle installed on a compacted snow straight road is the same as that of the same test vehicle.

The maximum traction ratio of the automobile snow chains should not be less than 1.2.

4.2.3 Loading requirements

When testing in accordance with 5.4, the test vehicle equipped with the automobile snow chains shall drive at least 80 km on the specified test road, Drive at least 20km on icy asphalt or concrete roads.

The test vehicle should be able to start normally on climbing roads. During the test, the tires installed with the car's snow chains should not continuously skid.

The pavement should not be damaged, the car snow chains should not break during the test, and the car snow chains should be complete after the test.

5.1 Test conditions

5.1.1 Environmental conditions

Test ambient temperature.-15 ° C or less.

5.1.2 Meteorological conditions

The test should be snow-free and fog-free; the wind speed is not greater than 5 m/s during the test.

5.1.3 Test vehicle

The test vehicle is a two-wheel drive four-wheel passenger vehicle equipped with ABS system. The vehicle condition should meet the technical requirements of the vehicle. The vehicle load is Ready quality plus two testers in the front row and necessary test equipment. The test tires should be new ordinary tires (not winter tires).

Set as recommended by the manufacturer. The test vehicle shall drive at least 100 km on dry asphalt or cement road before the test. Coping wheel before test Clean the tire surface. The test vehicle shall have a traction function.

5.1.4 Test site

5.1.4.1 Compacted snow straight

Compacted snow straight thickness is 60 The layer is a medium-heavy compacted snow layer with a thickness of 25 mm to 50 mm (see Appendix B).

5.1.4.2 Straight ice

Before the start of the Ice Straight, there is at least 300 m of runway with the same width as the ice straight.

A 50 m wide safety zone should have a 10 m wide safety zone on the left and right sides of the entire runway.

5.1.5 Test equipment

The test instrument should meet the requirements of 3.5 in GB/T 12534, and the MFDD should use an accuracy of ± 1% at the specified test speed.

MFDD can be measured by other methods besides measuring vehicle speed. In this case, the accuracy of its test equipment should be within Within 3%. The dynamometer accuracy should be ± 1%.

5.2 Braking performance test method

The braking performance test is a test vehicle that repeats a predetermined number of braking test operations (with the effect of ABS) in a short period of time.

The dynamic performance test results are the average of these test data.

The test vehicle was subjected to an emergency braking test with an initial velocity of 30 km/h on the compacted snow straight and ice straight, and the MFDD was recorded.

The peak pedal force should be no more than 500 N when braking on compact snow straight, and the peak pedal force should be no more than 800 N when braking on ice straight.

The pedal force should be kept as constant as possible. The compacted snow straight and ice straight braking tests were performed at least three times each.

The test wheels of the test vehicle were equipped with automobile snow chains, and the above operations were repeated.

Each braking performance test should avoid the previous test tire trajectory. If overlap is unavoidable, the test road surface should be reprocessed.

Note: The peak pedal force of each of the above braking performance tests should be as close as possible.

5.3 Traction performance test method

Traction performance test is a test vehicle that repeats a linear traction test operation a specified number of times in a short period of time. The traction test result is The average of these test data.

On the compacted snow straight road, the test vehicle and the towed vehicle are connected by a traction rope. The front row of the test vehicle rides 2 occupants (including driving Driver), one driver in the front row of the towed vehicle. After the test vehicle started, it kept at a speed of 10 km/h ~ 30 km/h and was pulled.

Pull the vehicle slowly until the drive wheels of the test vehicle slip, record the maximum traction during the test, and test at least 3 times.

The drive wheels of the towing vehicle are equipped with a car snow chain, and the above operations are repeated.

Each braking test should avoid the previous test tire trajectory, and if overlap is unavoidable, the test road surface should be reprocessed.

The test quality of the towed vehicle should ensure that the test vehicle can produce the maximum traction force, and the towed vehicle can be made by counterweight if necessary The test quality meets the requirements.

5.4 Loading test method

The test road should contain at least snow and a little icy pavement (including slopes with a slope of not less than 5%), asphalt-free roads with no snow or ice, or cement road.

The test vehicle with driving wheels and car snow chains installed shall run at least 80 km on the test road that meets the above requirements.

The driving speed of the test vehicle should be kept at 30km/h as far as possible, and the instantaneous driving speed should not exceed 50 km/h;

Complete the ramp start at least once on the ramp; stop at least once during each type of road driving and check the car's snow chains for damage to the road Conditions; during driving, avoid emergency braking, rapid acceleration, sharp turns, continuous idling, etc.; observe the test during the test.

If there is any abnormality in the vehicle, if the car's snow chains break, continuous slipping with the tires, or interference with the test vehicle, etc., Stop the test.