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QC/T 740-2017

Chinese Standard: 'QC/T 740-2017'
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BASIC DATA
Standard ID QC/T 740-2017 (QC/T740-2017)
Description (Translated English) Seat assembly of passenger car
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard T26
Classification of International Standard 43.040.60
Word Count Estimation 23,217
Date of Issue 2017-04-12
Date of Implementation 2017-10-01
Older Standard (superseded by this standard) QC/T 740-2005
Quoted Standard GB 7258; GB 8410; GB 11550; GB 11551; GB 11552; GB 14167; GB 15083; GB/T 15089; GB/T 29120; GB/T 30512; QC/T 55; QC/T 805; QC/T 831; QC/T 844; QC/T 845; QC/T 950; ISO 17373-2005
Drafting Organization Changchun Fuwei-Jiangsen Auto Control Car Trim System Co., Ltd.
Administrative Organization National Automotive Standardization Technical Committee
Regulation (derived from) Ministry of Industry and Information Technology Bulletin 2017 No.14
Summary This standard specifies the terms and definitions, technical requirements, test methods, inspection rules and signs, packaging, transportation and storage of passenger car seat assemblies.

QC/T 740-2017
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
T 26
Replacing QC/T 740-2005
Seat Assembly of Passenger Car
乘用车座椅总成
ISSUED ON: APRIL 12, 2017
IMPLEMENTED ON: OCTOBER 01, 2017
Issued by: Ministry of Industry and Information Technology of PRC
Ministry of Industry and Information Technology of the PRC
April 12, 2017
Attachment:
Number, name and date of implementation of 22 automotive industry
standards
No. Standard number Standard name Number of standard replaced
Date of
implementation
301 QC/T 727-2017 Instrument for automobile and motorcycle QC/T 727-2007 2017-10-01
302 QC/T 803-2017 Oxygen sensor for automobile QC/T 803.1-2008 2017-10-01
303 QC/T 1072-2017 Gear position sensor for automobiles 2017-10-01
304 QC/T 1073.1-2017 Accelerometers for automobiles - Part 1: Linear accelerometers 2017-10-01
305 QC/T 1074-2017 Technical specifications for automotive parts remanufacturing products 2017-10-01
306 QC/T 1075-2017
Technical conditions for metal
honeycomb carrier of exhaust catalytic
converter
2017-10-01
307 QC/T 777-2017
Technical conditions for
electromagnetic fan clutch of
automobile
QC/T 777-2007 2017-10-01
308 QC/T 1076-2017
Performance requirements and test
methods for continuously variable
transmission (CVT)
2017-10-01
309 QC/T 1077-2017
Terminology and definitions for
classification of automatic control
transmission for automobile
2017-10-01
310 QC/T 1078-2017 Advertising vehicle 2017-10-01
311 QC/T 1079-2017 Suction & delivery vehicle 2017-10-01
312 QC/T 1080-2017 Mobile loudspeaker for popularization of science 2017-10-01
313 QC/T 1081-2017 Electric power steering device for automobile 2017-10-01
314 QC/T 1082-2017 Motor for electric power steering device of automobile 2017-10-01
315 QC/T 1083-2017 Controller for electric power steering device of automobile 2017-10-01
Table of Contents
Foreword ... 6
1 Scope ... 8
2 Normative References ... 8
3 Terms and Definitions ... 9
4 Technical Requirements ... 10
5 Test Methods ... 16
6 Inspection Rules ... 28
7 Marking, Package, Transportation and Storage ... 31
Seat Assembly of Passenger Car
1 Scope
This Standard specifies the terms and definitions, technical requirements, test
methods, inspection rules, marking, package, transportation and storage for the seat
assembly of passenger car.
This Standard is applicable to the seat assembly of Type-M1 vehicle.
This Standard is not applicable to the folding seat, side-facing seat, and rearward-
facing seat.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB 7258 Safety Specifications for Power-Driven Vehicles Operating on Roads
GB 8410 Flammability of Automotive Interior Materials
GB 11550 Strength Requirement and Test of Automobile Seats Head Restraints
GB 11551 The Protection of the Occupant in the Event of a Frontal Collision for
Passenger Car
GB 11552 Passenger Car - Internal Protrusions
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 Trailer
GB/T 29120 Procedure for H-Point and R-Point Determination
GB/T 30512 Requirements for Prohibited Substances on Automobiles
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 Technical Requirements
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; the
specific requirements for covering, foam, spatter, airbag module and backrest
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. After test, the obtained force-displacement curve shall meet the
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 Test Methods
5.1 Frontal collision test
b) 95% male real person simulates the process of entering and leaving the car seat;
collecting a total of 5-position pressure distribution, such as 90°, 45°, 0°, 45°, 90°
(angles are separately into the seat side; intersection angle between 95% male
real person longitudinal center plane and the vehicle driving direction);
c) Use the robot to simulate the process of entering and leaving the seat in the same
position; the collected pressure distribution is similar to the real pressure
distribution; record the coordinates of the five positions; form an entry and exit
trajectory;
d) Remove the pressure distribution pad and start the test.
Method II: according to the trajectory of simulating the human body entering and
leaving the seat; compile the running program of the robot:
a) Simulate the human body and the seat to form an angle of 30° in longitudinal
direction, so that the horizontally press the side of the seat to enter into the seat;
the depression amount between seat side and backrest side shall be
20mm~30mm.
b) When the Point-H of simulated human body moves to above 20mm from the
edge of the seat, the simulated human body entirely rotates in the vertical
direction (the vertical line passing the Point-H serving as the rotating shaft);
gradually approaches the longitudinal center plane of the seat; during this
process, the fake hip of the simulated human body shall be gradually adjusted
to an angle of 15°~20° with the ground; simulate that the human backrest is
always in contact with the side of the backrest, and there are obvious indentation.
Finally moves to the position that the distance between the Point-H and
longitudinal center plane of seat about 15mm; simulate that the human body
longitudinal center plan forms an angle of 15° with the seat longitudinal center
plane.
c) Continue to rotate the simulated human body till it coincides with the longitudinal
center plane of the seat. The Point-H is basically coincident with the design
position; simulate that the human body’s back part is in normal contact with the
backrest of the seat, and there is obvious compression.
d) At this time, simulate the human body completely enters the seat; straighten,
simulate the human body to press till the load is 575N.
e) Simulate the human body to start moving out of the seat. Simulate the entire
human body to rotate in the vertical direction (the vertical line passing the Point-
H serving as the rotation axis); move it as a whole to the outside (move towards
the left/right front of the Point-H); rotate about 15°, at this time, Point-H moves
horizontally and longitudinally by 10mm~15mm. During this process, simulate
the human back to contact with the seat cushion and backrest; the indentation is
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.
Time 1 applying to
the target load
Target load duration
1 Target load v......
Related standard:   QC/T 998-2015  QC/T 965-2014
Related PDF sample:   QC/T 658-2009
   
 
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