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This standard is developed in accordance with the rules given in G/T 1.1-2009 Directives for standardization—Part 1: Structure and drafting of standards.
This standard replaces QC/T 740-2005 Seat assembly of passenger car and the following technical changes have been made with respect to QC/T 740-2005:
—— Application scope is changed (see Clause 1);
——Waveform for sled test in frontal crash is changed (see 5.1);
——Waveform for sled test in rear crash is changed (see 5.2);
——The load F5 left and F5 right for the static stiffness test of the front seat frame assembly and the corresponding inspection are added (see 4.3.1 and 5.4);
——Requirements for cushion width and depth are added (see 4.2.1);
——Requirements for neck protection in low-speed rear-end impact (whiplash test) are added (see 4.2.8);
——Requirements for prohibited substances are added (see 4.2.11);
——Requirements for seat forward tilt and height adjustment function are added (see 4.3.8);
——Requirements for seat forward tilt and height adjustment fatigue are added (see 4.3.9);
——Strength and fatigue requirements of seat locks are added (see 4.3.16);
——Requirements for lumbar support adjustment function are added (see 4.3.17);
——Requirement for lumbar support adjustment fatigue are added (see 4.3.18);
——Requirements for map pocket function are added (see 4.3.19);
——Requirements for map pocket fatigue are added (see 4.3.20);
——Ventilation function requirements are added (see 4.3.25);
——Definitions of adjustment system, folding seat, side-facing seats, rearward-facing seats, seat trim cover assy, seat covering and map pocket are added (see 3.5~3.11);
——General requirements for seat covering are added (see 4.1.5);
——General requirements for height-adjustable seats are added (see 4.1.6);
——General requirements for exposed plastic parts of seats are added (see 4.1.7);
——General requirements for height-adjustable head restraint are added (see 4.1.8);
——VOC (volatile organic compounds) test requirements for seat assembly components are added (see 4.1.13);
——The performance requirements for seat fabric are deleted;
——The emission performance test of nonmetallic materials is deleted.
This standard was proposed by and is under the jurisdiction of National Technical Committee of Auto Standardization (SAC/TC 114).
This standard is not concerned with patent.
The previous edition of this standard is as follows:
——QC/T 740-2005.
Seat assembly of passenger car
1 Scope
This standard specifies the terms and definitions, technical requirements, test methods, inspection rules as well as marking, packaging, transportation and storage for seat assembly of passenger car.
This standard applies to seat assembly of M1 vehicles.
This standard is not applicable to folding seats, side-facing seats and rearward-facing seats.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 7258 Technical specifications for safety of power-driven vehicles operating on roads
GB 8410 Flammability of automotive interior materials
GB 11550 Motor vehicles—Seats head restraints performance requirements and test methods
GB 11551 The protection of the occupants in the event of a frontal collision for motor vehicle
GB 11552 The interior fittings of passenger car
GB 14167 Safety-belt anchorages, ISOFIX anchorages systems and ISOFIX top tether anchorages for vehicles
GB 15083 Strength requirement and test of automobile seats, their anchorages and any head restraints
GB/T 15089 Classification of power-driven vehicles and trailers
GB/T 29120 Procedure for H-point and R-point determination
GB/T 30512 Requirements for prohibited substances on automobiles
QC/T 55 Dynamic comfort test method for automobile seat
QC/T 805 Passenger car—Technique specification of slide for seat
QC/T 831 Technical specification of power slide for passenger car seat
QC/T 844 Technical specification of recliner for passenger car seats
QC/T 845 Passenger car—Technique specification of lock for seat
QC/T 950 Performance requirement and test of heating car cushion
ISO 17373:2005 Road vehicles—Sled test procedure for evaluating occupant head and neck interactions with seat/head restraint designs in low-speed rear-end impact
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
seat
a facility which may or may not be integral with the vehicle structure complete with trim cover, intended to seat one adult person. The term covers both an individual seat and part of a bench seat.
3.2
front passenger seat
a seat that the "foremost H-point" is located on or in front of the cross section passing through the driver's R point.
3.3
front seat cushion
component in the front seat that supports the buttocks of the occupant.
3.4
front seat back
component in the front seat that supports the back of the occupant.
3.5
adjustment system
the system by which the seat or its components can be adjusted to fit for the occupant. It may include (but not limited to) the following functions: longitudinal displacement; vertical displacement; angular displacement.
3.6
folding seat
the spare seat that is designed for adult occupants to use occasionally and is easy to operate and self-locked when in use. Normally, it is in a folded state.
3.7
side-facing seat
the seat for use in the operation of the vehicle, arranged facing the side of the vehicle so that the angle formed by 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 for use in the operation of the vehicle, arranged facing the rear of the vehicle so that the angle formed by 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 outermost layer of the seat made of fabric, leather and other materials for the purpose of protection and decoration.
3.10
seat covering
the outer surface of the seat cover.
3.11
map pocket/insert
pockets arranged on the back or side of the seat for inserting books, newspapers and other sundries.
4 Technical requirements
4.1 General
4.1.1 The seats shall meet the requirements of this standard, and be fabricated according to the drawings and technical documents approved through established procedures.
4.1.2 If the surfaces of seats and head restraint are covered with materials with Shore (A) hardness lower than 50, the rigid parts shall meet the requirements of GB 11552 or GB 15083.
4.1.3 All trim covers shall meet the sewing and appearance requirements of their corresponding drawings and technical documents.
4.1.4 Seat trim covers shall be free from pollution, damage, cracking and suture cracking.
4.1.5 The seat covering shall be free of unacceptable wrinkles, bulges, curved stitches, scraggy feeling and other defects agreed by both parties.
4.1.6 When the seats of height-adjustable seats is adjusted to the forward and upward limit position, there shall be no visible gap between the lower end of the seat back and the rear of the seat cushion recognized by both parties.
4.1.7 All exposed plastic parts of seats shall meet the appearance requirements of their corresponding drawings and technical documents.
4.1.8 When the height-adjustable head restraint is locked at any position, it shall conform to the technical requirements of the drawings and technical documents for the distance difference from its left and right lower end respectively to the upper surface of the seat back.
4.1.9 The H-point measurement of the seat shall be carried out according to GB/T 29120, with the measurement error controlled within ±15 mm and the torso angle error within ±3°.
4.1.10 Installation torque shall meet the requirements of design drawings and technical documents.
4.1.11 The dimension of the seat installation position shall comply with the design requirements and shall be tested by inspection tools.
4.1.12 Each adjustment system and shifting system shall be equipped with locking system capable of self-latching at any use position.
4.1.13 VOC (volatile organic compounds) requirements and test methods of seat assembly components shall conform to the requirements of drawings and technical documents.
4.2 Safety requirements
4.2.1 Cushion width and depth
The cushion width and depth shall meet the requirements of GB 7258.
4.2.2 Flammability
The flammability shall meet the requirements of GB 8410.
4.2.3 Performance of seat head restraint
The performance of the seat head restraint shall meet the requirements of GB 11550.
4.2.4 Safety-belt anchorages, ISOFIX anchorages systems and top tether anchorages
Safety-belt anchorages, ISOFIX anchorages systems and ISOFIX top tether anchorages shall meet the requirements of GB 14167.
4.2.5 Strength of seat system
The strength of the seat system shall meet the requirements of GB 15083.
4.2.6 Frontal crash
During and after the sled acceleration or deceleration test, the dummy can be completely restrained by the safety belt assembly, and the anchorage between the seat and the floor shall not be completely separated; the seat parts shall not be loosed or fractured, and the locking system shall not fail; permanent deformation that does not increase the degree of injury is allowed during the crash but the sharp edges and corners that cause additional injury to passengers in the vehicle shall not be produced; the displacement device that allows or helps passengers to pass through shall be in working state, and can be unlocked at least once, and the seat or part of the seat can be moved as required; the head restraint remains in the original locking position. See 5.1 for the test methods.
4.2.7 Rear crash
During and after the sled acceleration or deceleration test, the dummy can be completely restrained by the safety belt assembly, and the anchorage between the seat and the floor shall not be completely separated. Seat parts shall not be loose or fractured. The seat back can be tilted, and the maximum tilting angle of the seat back shall meet the requirements of drawings and technical documents. The seat locking system shall not be released and shall be well functional; permanent deformation that does not increase the degree of injury during the crash is allowed but sharp edges and corners that cause additional injury to passengers in the vehicle are not allowed; the displacement device that allows or helps passengers to pass through shall be in working state, and can be unlocked at least once, and the seat or part of the seat can be moved as required; the locking system of seat back still needs to keep its function; the seat back remains in the original locking position. See 5.2 for the test methods.
4.2.8 Neck protection in low-speed rear-end impact (whiplash test)
For neck protection in low-speed rear-end impact (whiplash test), see ISO 17373: 2005, and the evaluation standard shall conform to the requirements of relevant drawings and technical documents.
4.2.9 Side airbag system and its attached seat trim cover
The initiation of the side airbag shall not cause deformation or fracture of the frame, and other parts of the seat shall not affect the normal unfolding of the side airbag and shall not cause occupant injury. After the test, the seat assembly or the back cover is only allowed to explode at the specified position. During the test, the specific requirements of the cover, foam, splash, airbag module and seat back accessories shall conform to the provisions of the drawings and technical documents, and the unfolding time related to the airbag shall conform to the provisions of the drawings and technical documents. See 5.3 for the test methods.
4.2.10 Heating car cushion
The heating car cushion shall meet the requirements of QC/T 950.
4.2.11 Prohibited substances
Prohibited substances shall meet the requirements of GB/T 30512.
4.3 Strength, durability and functional requirements
4.3.1 Static stiffness of front seat frame assembly
Static stiffness test is to verify the stiffness of the front seat frame. Under the action of 500 N, the elastic deformation of the front seat frame shall not be greater than the target value. The measured value at S point shall be less than the maximum value listed in Table l. See 5.4 for the test methods.
Table 1 Stiffness requirements of front seat frame
Loading force F1 or F2
500 N F3
500 N F4 left
500 N F4 right
500 N F5 left
500 N F5 right
500 N F6 left
500 N F6 right
500 N
Measured value S1+S2 S3 S4 left S4 right S5 left S5 right S6 left
S6 right S6 left
S6 right
Maximum displacement
mm 4 1.5 3 3 3.5 3.5 3.5 3.5
4.3.2 Bumping and creeping
After the test, the sample shall have no abnormal conditions, without crack in seat frame, tearing in foam, or damage in the covering and cushion, and the maximum change of H-point is within the design requirements. See 5.5 for the test methods.
4.3.3 Dummy seating in and out
Test wear resistance of the covered seat by the dummy seating in and out; test the whole seat by dummy seating in and out 15,000 times. After the test, the seat covering shall not be broken, lumped, loose or exposed or damaged, and the stitches shall not be broken. See 5.6 for the test methods.
4.3.4 High and low temperature resistance of seats
The high and low temperature resistance of the seat shall meet the requirements of relevant drawings and technical documents.
4.3.5 Downward strength of front seat cushion
After the test, the front seat cushion frame and the fixed bracket of cushion frame shall not be cracked, the height adjustment system and the longitudinal locking system shall not be cracked and the longitudinal locking mechanism shall be functional and adjustable. See 5.7 for the test methods.
4.3.6 Longitudinal adjustment of seats
The seat longitudinal adjustment function shall meet the requirements of QC/T 805 (manual adjustment) and QC/T 831 (electric adjustment).
4.3.7 Fatigue of seat longitudinal adjustment
Fatigue of seat longitudinal adjustment shall meet the requirements of QC/T 805 (manual adjustment) and QC/T 831 (electric adjustment).
4.3.8 Forward tilt and height adjustment of seats
In the full stroke, the operating force of the height adjustment handle shall be less than 75 N in the upward and downward directions; the operating torque of the hand wheel height adjustment and cushion forward tilt adjustment mechanism shall be less than 3N·m. See 5.8 for the test methods.
4.3.9 Seat forward tilt and height adjustment fatigue
After the test, the forward tilt and height adjustment system functions shall be normal and automatic adjustment is not allowed and meet the requirements of seat forward tilt and height adjustment function test; there is no abnormal sound during the test. See 5.9 for the test methods.
4.3.10 Seat back frame assembly clearance
The seat back shall be gapless before and after continuous loading. When the loading force reaches 25 N, the gap of the seat back shall not exceed 3.5 mm. When the loading force reaches 147 N, the maximum clearance at the loading point shall not exceed 15 mm. See 5.10 for the test methods.
4.3.11 Stiffness of seat back frame assembly
The measured plastic deformation after unloading shall not exceed 10 mm. See 5.11 for the test methods.
4.3.12 Strength of seat back frame assembly
When the seat back reaches the target load 2, the back frame and angle adjuster shall not be damaged. The force-displacement curve obtained after the test shall conform to the requirements of drawings and technical documents. Before reaching the target load 2, the actual load value shall be greater than the target value. See 5.12 for the test methods.
4.3.13 Durability of seat back frame assembly
There is no abnormal sound during cyclic loading. After the test, the seat back adjustment and locking function normally; no parts are damaged. See 5.13 for the test methods.
4.3.14 Seat back adjustment function
The seat back adjustment function shall meet the requirements of QC/T 844.
4.3.15 Seat back adjustment fatigue
Seat back adjustment fatigue shall meet the requirements of QC/T 844.
4.3.16 Strength and fatigue of seat lock
The strength and fatigue of the seat lock shall meet the requirements of QC/T 845.
4.3.17 Lumbar support adjustment function
During the adjustment, smooth and uniform adjustment torque is ensured without fluctuation; abnormal noise is not allowed, and the maximum torque for manual adjustment is 3.5 N·m. See 5.14 for the test methods.
4.3.18 Lumbar support adjustment fatigue
After the test, the lumbar support adjustment functions normally and meets the requirements of 4.3.17. See 5.15 for the test methods.
4.3.19 Map pocket function
After the test, the map pocket shall not be damaged or the stitches not broken. The cover or buckle used to fix the map pocket shall not fall off. Other performance requirements of map pockets shall conform to the requirements of drawings and technical documents. See 5.16 for the test methods.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation and storage
