JT/T 1178.1-2018Safety specification for commercial vehicle for cargos transportation - Part 1: Goods vehicle (English PDF)

5.7 The performance of the brake linings of the goods vehicle's drum brake

shoe assembly or disc brake shoe assembly, shall meet the following requirements:

a) When tested according to GB/T 22309, the minimum shear strength of drum brake shoe assembly and disc brake shoe assembly is greater than or equal to 2.5 MPa;

b) When tested according to GB/T 22311, the normal temperature compression of the drum brake shoe assembly is less than or equal to 2%;

the compression at 200 °C is less than or equal to 4%;

c) When tested according to GB/T 22311, the normal temperature compression of the disc brake shoe assembly is less than or equal to 2%;

the compression at 400 °C is less than or equal to 5%.

5.8 When a goods vehicle, which has a total mass greater than or equal to

12000 kg, adopts pneumatic braking, the rated working air pressure of the brake system's air cylinder shall be greater than or equal to 1000 kPa.

5.9 For goods vehicle, which has a total mass greater than or equal to 12000 kg AND a maximum speed greater than 90 km/h, all steering wheels shall be equipped with disc brake. When the disc brake's linings need to be replaced, acoustic or optical alarms shall be used to alarm the driver. The alarm device shall meet the requirements of GB 12676.

5.10 For goods vehicle, which has a total mass greater than or equal to 12000

6.8 Gas-fueled vehicles shall be equipped with automobile static conductive rubber tow belt. The performance of automobile static conductive rubber tow belt shall meet the requirements of JT/T 230.

C.1 Test requirements

C.1.1 The structural strength test methods of the cab include the frontal collision test of the cab (Test A), the double A-pillar collision test of the cab (Test B), the strength test of the top of the cab (Test C), the strength test of the rear enclosure of the cab (Test D), which can be performed on 1 ~ 4 cabs.

C.1.2 For the category N1 vehicles, AND the category N2 vehicles, which have a maximum designed total mass not exceeding 7500 kg, they shall be subjected to test A, test C, test D.

C.1.3 For the category N3 vehicles, AND the category N2 vehicles, which have a maximum designed total mass exceeding 7500 kg, they shall be subjected to test A, test B, test C, and test D.

C.1.4 Test A is only applicable to flat-head vehicles.

C.1.5 Test C is only applicable to vehicles, where the cab connects the vehicle frame through a mechanism AND the cab is independent of the cargo box.

C.1.6 Every seat in the cab shall be inspected for survival space.

C.1.7 When the model meets the requirements of GB 11551, it is deemed to have passed the test A.

C.1.8 When inspecting the survival space of the driver's cab after the test, the following dummy or alternatives can be used:

a) The dummy, which is specified in C.4;

b) Disassemble the dummy, which is specified in C.4; adjust the seat position;

put it in the cab AND then assemble the dummy; make its H point coincide with the R point of seat; finally move the seat forward to the middle position, to assess survival space;

c) 50% Hybrid II or 50% Hybrid III dummy.

C.2 Test method

C.2.1 Test preparation

C.2.1.1 Before the test, the door of the cab shall be closed but not locked.

C.2.1.2 For the test A, the vehicle shall be equipped with an engine, OR a model which has the installation mass, size, installation device equivalent to that of the engine.

C.2.1.3 The cab shall be equipped with steering mechanism, steering wheel, instrument panel, driver's seat, passenger seats. The position of the steering wheel and the seat shall be adjusted to the intermediate position, which is specified by the manufacturer.

C.2.1.4 The vehicle or frame shall be fixed in a manner as described in C.3.

The cab shall be fixed in accordance with the following requirements:

a) For the test A, the cab shall be installed on the vehicle;

b) For the test B, test C, test D, the manufacturer can choose to install the cab on the vehicle or on an independent frame.

C.2.2 Frontal collision test (test A)

C.2.2.1 The impactor shall be made of steel, which has uniform mass distribution. The mass of the impactor is greater than or equal to 1500 kg. The collision surface of the impactor shall be a flat rectangle; the fillet radius of the edges is (10 ± 5) mm, as shown in Figure C.1.

C.2.2.2 The impactor assembly shall be a rigid structure. The impactor shall be rigidly fixed on two freely suspended swing arms.

C.2.2.3 The suspension position of the impactor shall be such, that it meets the following requirements when in a vertical position:

a) The impact surface of the impactor is in contact with the foremost part of the vehicle;

b) The center of mass (CA) of the impactor shall be lower than the R point of the driver's seat; meanwhile it shall be located on the longitudinal center plane of the vehicle, as shown in Figure C.1;

c) The center of mass of the impactor shall be located on the longitudinal center plane of the vehicle.

a) The impactor shall be made of steel, which has uniform mass distribution.

The mass of the impactor is not less than 1500 kg;

b) The impact surface of the impactor shall be flat and rectangular, which shall be large enough (generally 2500 mm x 2500 mm), to ensure that when the impactor is at the impact position, the cab does not touch the edge of the impactor. If the impactor is a pendulum, the pendulum shall be rigidly fixed on two freely suspended swing arms; the spacing between the swing arms (fc) is not less than 1000 mm; the length of the swing arm (LC) (from the suspension axis to the geometric center of the pendulum) is not less than 3500 mm;

c) At the moment of impact, the position of the impactor shall meet the following requirements:

1) The angle (alphac), BETWEEN the impact surface of the impactor AND the longitudinal center plane of the cab, is 20°;

2) When the impactor impacts, the cab can be tilted by 20°; OR the impact surface of the impactor can be tilted by 20°. If the impactor is a pendulum, the cab cannot be tilted by 20°. The cab shall be installed on a horizontal surface;

3) The impact surface of the impactor shall cover the entire length of the side top of the cab;

4) The longitudinal centerline of the impactor shall be horizontal, AND parallel to the longitudinal centerline of the cab;

d) The impactor hits the side top of the cab; the impact direction is perpendicular to the impact surface of the impactor AND the longitudinal centerline of the cab. In the case of meeting the requirements of the impact position, it may move the impactor or the cab, to complete the impact test. The impact energy is 17.6 kJ.

C.2.4.3 The top static pressure test shall meet the following requirements:

a) The loading plate shall be made of steel, whose mass shall be evenly distributed. The loading surface of the loading plate shall be a rectangular plane. When loading, it shall ensure that the cab does not touch the edge of the loading plate;

b) There shall be a straight-line guide system, between the loading equipment and its supporting structure. It allows the top of the cab to move laterally, to the non-impact side, during the loading process;

c) When loading, the position of the loading plate shall meet the following b) The longitudinal beams of the frame shall be placed on the sleeper cushion that spans the full width of the frame. The length of the sleeper cushion shall not be less than 150 mm. The front edge of the sleeper cushion shall neither be located in front of the rearmost point of the cab, nor be located behind the midpoint of the wheelbase. The frame shall be in the state when the vehicle is fully loaded;

c) If the frame is fixed longitudinally, the chain or wire rope (hereinafter collectively referred to as wire rope) A shall be fastened to the front end of the frame, to restrict the frame from moving backward. The securing points shall be symmetrical to the longitudinal centerline of the frame; the distance between the two securing points shall not be less than 600 mm.

The angle, BETWEEN the downward direction of the wire rope A, after being tensioned, AND the horizontal line, shall not be greater than 25°.

The angle, BETWEEN the projection on the horizontal plane AND the longitudinal axis of the vehicle, shall not be greater than 10°. The wire ropes can cross each other;

d) The frame is fixed laterally. The wire rope B shall be symmetrically tied to both sides of the longitudinal centerline of the frame, to restrict the lateral movement of the frame. The securing point on the frame is not less than

3 m AND not more than 5 m, from the front end of the vehicle. The angle,

BETWEEN the downward direction of the wire rope B, after tensioned,

AND the horizontal line, is not more than 20°. The angle, BETWEEN the projection on the horizontal plane AND the longitudinal axis of the vehicle, is not more than 45° and not less than 25°;

e) The tension and rear fixation of the wire rope shall meet the following requirements:

1) First, tension the wire rope C by a force of 1000 N. Then tension all the wire ropes A and B, so that the tension of the wire rope C is not less than 10000 N;

2) The angle between the wire rope C and the horizontal line is not more than 15°;

3) Apply a vertical tension of not less than 500 N, between the frame and the ground, at the point D;

f) According to the requirements of the manufacturer, the cab can be installed on a special bench for testing; however, it shall be proved that this installation method is equivalent to the installation method on the vehicle.

......