QC/T 740-2017Seat assemblies for passenger cars (English PDF)

3.7 Side-facing seat

The seat used in the running of the vehicle, arranged to the side of the vehicle. The angle between the symmetrical vertical plane of the seat and the symmetrical vertical plane of the vehicle is 90°±10°.

3.8 Rearward-facing seat

The seat used in the running of the vehicle, arranged to the rear part of the vehicle. The angle between the symmetrical vertical plane of the seat and the symmetrical vertical plane of the vehicle is 0°±10°.

3.9 Seat trim cover assy

The seat covering that is the outermost layer of the seat made of fabric, leather and other materials for protection and decoration.

3.10 Seat covering

The outer surface of the seat trim cover.

3.11 Map pocket/insert

The pocket for inserting books, newspapers, etc. on the back or side of the seat.

4.1 General requirements

4.1.1 The seat shall meet the requirements of this Standard, and be manufactured in accordance with the product drawings and technical documents approved by the prescribed procedures.

4.1.2 If the seat and headrest surfaces are covered by a material with a Shore hardness (A) of less than 50; its rigid parts shall meet the requirements of GB 11552 or GB 15083.

4.1.3 All trim covers shall meet the requirements for sewing and appearance according to corresponding drawings and technical documents.

4.1.4 The trim covers of the seat shall be free of pollution, damage, crack, and crack of the seam.

4.1.5 The seat covering shall be free of unacceptable wrinkles, bulging, stitch bending, unevenness and the like defects as agreed between the supplier and the purchaser.

4.2.5 Seat system strength

The seat system strength shall meet the requirements of GB 15083.

4.2.6 Frontal collision

During and after the sled accelerated or decelerated test, the dummy can be restrained by the seat belt assembly, and he fixing device between the seat and the floor is not allowed to be completely separated; the seat parts are not allowed to be loose or break, the locking device is not allowed to fail; the permanent deformation is allowed to occur during the collision without increasing the degree of damage; no sharp corners are allowed to generated to additionally injure the occupants in the vehicles; the displacement device that allows or facilitates the passage of the occupant shall be in operation and at least guaranteed to be unlocked once, and the seat and the portion of the seat can be moved as needed; the headrest remains in the original locked position. For test method, see 5.1.

4.2.7 Rear collision

During and after the sled accelerated or decelerated test, the dummy can be restrained by the seat belt assembly, and he fixing device between the seat and the floor is not allowed to be completely separated. The seat parts are not allowed to be loose or break. The backrest can be tilted with the maximum tilt angle of backrest meeting the requirements of drawings and technical documents. The locking device of the seat is not allowed to be loose, and maintain its function intact; the permanent deformation is allowed to occur during the collision without increasing the degree of damage; no sharp corners are allowed to generated to additionally injure the occupants in the vehicles; the displacement device that allows or facilitates the passage of the occupant shall be in operation and at least guaranteed to be unlocked once, and the seat and the portion of the seat can be moved as needed; the locking device of the backrest shall still maintain functions intact; the headrest remains in the original locked position. For test method, see 5.2.

4.2.8 Low-speed rear collision neck protection (whiplash test)

The low-speed rear collision neck protection (whiplash test) can refer to ISO 17373:2005; the evaluation criteria shall meet the requirements of relevant drawings and technical documents.

4.2.9 Side airbag system and its associated seat covering

The blasting of the side airbag shall not cause the deformation or breakage of the skeleton; the other parts of the seat shall not affect the normal deployment of the side airbag, neither shall it injure the occupants. After the test, the seat assembly or the backrest covering shall only be allowed to blast at the specification position.

4.3.5 Front seat cushion downward strength

After the test, the front seat cushion frame and the fixing bracket of the seat cushion frame shall be free of cracks; the height-adjusting mechanism and longitudinal-locking mechanism shall not be broken; the longitudinal-locking mechanism shall not fail, and can be adjusted. Test methods can refer to 5.7.

4.3.6 Seat longitudinal adjustment function

The seat longitudinal adjustment function shall meet the requirements of QC/T 805 (manual adjustment) and QC/T 831 (electric adjustment).

4.3.7 Seat longitudinal adjustment fatigue

The seat longitudinal adjustment fatigue shall meet the requirements of QC/T 805 (manual adjustment) and QC/T 831 (electric adjustment).

4.3.8 Seat tilting forward and height adjustment function

During the full stroke range, the upward and downward operating force of the height adjustment handle shall be less than 75N; the operating torque for the handwheel height adjustment and seat tilting adjustment mechanism shall be less than 3N·m. Test methods can refer to 5.8.

4.3.9 Seat tilting forward and height adjustment fatigue

After the test, the function of tilting forward and height adjustment shall be normal; the automatic adjustment is not allowed; meet the requirements for seat tilting forward and height adjustment function; there is no abnormal noise during the test. Test methods can refer to 5.9.

4.3.10 Backrest frame assembly gap

The seat backrest shall be free of gap before and after the continuous loading. When the loading force reaches 25N, the seat backrest gap shall not exceed 3.5mm. When the loading force reaches 147N, the maximum gap at the loading point shall not exceed 15mm. Test methods can refer to 5.10.

4.3.11 Backrest frame assembly stiffness

The plastic deformation measured after unloading shall not exceed 10mm. Test methods can refer to 5.11.

4.3.12 Backrest frame assembly strength

When the seat backrest reaches the target load 2, the backrest frame and recliner shall be free of damage.

4.3.21 Seat armrest strength

The maximum deformation (elastic deformation) of the seat armrest when loading vertically downward is no more than 76mm, the plastic deformation shall be no more than 25mm; the maximum deformation (elastic deformation) of seat armrest when lateral loading is no more than 25mm, the plastic deformation shall be no more than 6mm. Test methods can refer to 5.18.

4.3.22 Armrest durability

After the test, the armrest shall maintain the original functional requirements; no hinge mechanism defects, covering shall not be cracked, dislodged or exposed. No abnormal noise is allowed during and after the test. Test methods can refer to 5.19.

4.3.23 Headrest function

The headrest shall be adjusted evenly and smoothly; the headrest is easy to install and remove. The operating force of the headrest locking button shall be 20N ± 10N.

The headrest function test is adjusted up and down along the headrest pole; and the operating force shall be no more than 100N.

4.3.24 Headrest durability

After the test, the headrest function and the locking device shall be normal; the operating force of the headrest shall meet the requirements of 4.3.23. There is no abnormal noise during the test. Test methods can refer to 5.20.

4.3.25 Ventilation function

The functional requirements of ventilation shall be in accordance with the relevant drawings and technical documents.

4.3.26 Adjustment function of the electric seat

The adjustment function of the electric seat and the electric seat with memory function shall meet the requirements of relevant drawings and technical documents.

4.4 Seat comfort

The seat comfort shall meet the relevant requirements of the drawings and technical documents or QC/T 55.

5.8 Seat forward tilting and height adjustment function test

Apply 60kg load downward at the Point-H of the seat cushion (use the fake hip module specified in GB/T 29120, the weight of which is 10kg; apply 5kg of load on each side of the thigh; the remaining 40kg is evenly loaded at the Point-H of fake hip); at the position of 20mm backward from the end of the height adjustment handle, measure the upward and downward operating force of the height adjustment handle in the vertical direction with a dynamometer or the same force value counting device; for handwheel height adjustment and cushion forward tilting adjustment mechanisms, under the same loading condition, use a torque wrench or an equivalent torque measuring device to measure the handwheel torque.

5.9 Seat forward tilting and height adjustment fatigue test

Fix the seat or the seat frame with the counterweight on the test platform according to the vehicle installation position; apply 60kg of additional load on the Point-H (use the fake hip module specified in GB/T 29120, weighing 10kg, load 5kg on each side of the thigh; the remaining 40kg is evenly loaded at the fake hip Point-H). Test cycle:

a) Forward tilting and height adjustment are from bottom to the top, then return to the bottom, which is one cycle. Test shall be carried out at various temperature; the test interval shall be 4h.

b) 3000 times at 23°C;

1000 times at 60°C;

1000 times at -20°C.

5.10 Backrest frame assembly clearance test

Fix the front seat frame on the test bench and adjust to the design position. Apply a test force to the center of the upper endo of the beam on the backrest (for pipe structure, it is center of upper horizontal pipe), the direction is the longitudinal from back and forth, size is of 147N; the sum of the measured values of the forward and rearward loading is the clearance, see Figure 3.

6.2.2.3 Judgment of type inspection results

The seats for the type inspection shall be taken from the same batch of the seat assembly that have passed the exit-factory inspection. For the inspection items, if one of the inspection items (from Item 8 to Item 18) with safety requirements does not be qualified, then such batch of projects shall be judged unqualified; no re-inspection is allowed. If any one of the remaining inspections items are unqualified, it is allowed to double the number of unqualified samples for re-inspection of the unqualified items; if there is still one unqualified item in the reinspection, then such batch of products shall be judged unqualified.