This standard specifies the technical requirements to prevent the steering mechanism from causing harm to the driver, the test method for the steering wheel to move backward when the car is hit by a frontal impact, and the test method for the steering wheel to absorb energy when it is hit by the impact. This standard applies to M1 category vehicles, but does not apply to short-head vehicles and flat-head vehicles. GB 11557-1998 Regulations on preventing injuries to drivers caused by steering mechanisms of automobiles GB11557-1998 Standard download and decompression password: www.bzxz.net

GB 11557—1998
Previous
Preface
At present, almost all developed foreign automobile countries have restrictions on the damage caused by automobile steering mechanisms to drivers, and their corresponding automobile safety regulations are also relatively complete. .
This standard selects two performance indicators used by most countries in the world to evaluate the damage caused by the steering wheel to the driver, and the corresponding test methods. Since most of the cars in our country have been imported from Europe in recent years, this standard is based on EEC and ECE, and also refers to the Japanese JIS D standard
This standard is a revision of GB11557-89, based on the mandatory standard The writing requirements only include requirements related to safety projects, and projects that do not need to be mandatory are no longer included in the standard. Therefore, 3.1 and 3.2 in the original standard have been deleted, and some definitions have been modified. The revised standard is consistent with the three major international automotive technical regulations in terms of specified performance indicators and test methods. Therefore, the revision of this standard has achieved the purpose of being in line with similar international standards and regulations. The movement requirements in Article 3.1 of this standard will be implemented 48 months after the release of the standard due to the need for real vehicle collisions. This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the National Automotive Standardization Technical Committee. This standard is drafted by Changchun Automotive Research Institute. Drafter of this standard: Cui Guangbin.
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1 Scope
National Standard of the People's Republic of China
Provisions on preventing injuries to drivers by motor vehicle steering mechanismsThe stipulation protecting drivers from being injured by motor vehicle steering mechanismGB 11557 --1998
Replaces GB11557-89
This standard specifies the technical requirements to prevent the steering mechanism from causing harm to the driver and the test method and steering wheel movement backward when the car is hit by a frontal impact. Test method for the energy absorbed by a disk when subjected to impact. This standard applies to M1 category vehicles, but does not apply to short-head vehicles and flat-head vehicles. 2 Definitions
This standard adopts the following definitions. | |tt |
2.2 Human body module
Human torso and head model that applies impact load to the steering wheel. 2.3 Impact speed
The instantaneous speed of the human body module hitting the steering wheel. 2.4 Impact load
The water direction load exerted by the human body module on the steering wheel. 2.5 The moment of impact
The initial contact time between the human body module and the steering mechanism. 2.6 Short-headed vehicle
A vehicle in which the center of the steering wheel is within the front quarter of the entire length of the vehicle (including the bumper, including the bumper stop if there is one). 3 Technical Requirements
3.1 When a prepared vehicle without a human body module collides head-on with an obstacle wall at a speed between 48.3 and 53.1km/h, the upper ends of the steering column tube and steering shaft are allowed to move parallel to the longitudinal centerline of the vehicle. It moves backward in the horizontal direction, but its movement amount shall not be greater than 127mm (measured under dynamic conditions).
3.2 When the human body module impacts the steering wheel horizontally at a speed of 24.1+2km/h, the horizontal force acting on the steering wheel shall not be greater than 11123N.
4 Test Methods
4.1 Test for backward movement of the steering wheel during a frontal impact. 4.1.1 Test site
National Bureau of Quality and Technical Supervision approved on 1998-05-06 for implementation on 1999-01-01
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GB 11557-1998
It is wide enough to allow the installation of barrier walls and necessary technical equipment for automobiles. The last section of the runway (at least 5m before the barrier) should be straight paved road. 4.1.2 Barrier wall
The barrier wall is a reinforced concrete building platform, and its minimum dimensions are: 3m wide, 3m high, and 0.6m thick. The collision wall must be perpendicular to the last section of the high-speed runway and covered with 20mm thick plywood, with at least 90t of soil accumulation slope behind it. This barrier wall made of concrete and soil can also be replaced by an obstacle with the same area (area) and the same effect. It is required that the impact surface of the obstacle wall must be perpendicular to the center line of the runway. The obstacle wall must be fixed on the test track. If it floats on the road, some blocking and supporting devices must be attached to prevent it from moving. Barriers with the same performance can also be used. Object replacement 4.1.3 Impact direction
The vehicle should be in the direction perpendicular to the barrier wall, and the maximum allowable offset between the vehicle's longitudinal symmetrical center line and the vertical center line of the barrier wall is ±300 mm.
4.1.4 Vehicle condition
4.1.4.1 The vehicle is in a ready state, and the test instruments should be installed securely. All devices and components in the vehicle (driver's seat, rear seats) should be installed securely, and the steering control mechanism must not be touched during the test. 4.1.4.2 If the vehicle under test is driven by an external device, the vehicle fuel supply system should be filled with non-flammable liquids with a density, viscosity, etc. similar to those of the normally used fuel. The filling capacity should be at least 90% of the total capacity. Others Systems (brake reservoir, radiator, etc.) should be empty. 4.1.5 Impact speed
The impact speed should be between 48.3 and 53.1km/h. If the impact speed during the test is higher than this value, the test should be considered valid as long as the vehicle condition still meets the specified requirements.
4.1.6 Measuring instruments
The accuracy of measuring instruments is ±1%, and the accuracy of timers is ±1ms. 4.1.7 Test results
4.1.7.1 Measure and record the relative position changes between the upper end of the steering column tube (or steering shaft) and a point on the vehicle that is not affected by the impact in the horizontal direction parallel to the vehicle's longitudinal symmetry plane Quantity D. , and calculate the steering wheel's backward movement amount D according to the formula: D, = D. · K, · K2
where: D
D.
K,
Steering wheel backward movement, mm;
Steering after impact Relative position change of column tube (or steering shaft), mm; speed correction coefficient, its value is [(49±1) km/h/\, if the value is less than 0.83, it is calculated as 0.83; K, - mass Correction coefficient, its value is (mo/m), if the value is less than 0.8, it is calculated as 0.8; w - actual impact speed, km/h;
Test sample vehicle mass, kg;
m.
m.
The mass of the test sample vehicle equipped with test instruments, kg. 4.2 Steering wheel energy absorption test when struck 4.2.1 Test device
4.2.1.1 Human body module
(1)
The human body module should comply with the following characteristics, main dimensions, quality and deformation stiffness (including channel steel and load measurement position) must meet the following requirements.
a) The structural dimensions should meet the requirements of Figures 1 to 3. 228
plywood
91
305
ots
129
101.6
31.8
305| |tt||GB 11557—1998
R12.
17.8×5
reinforced plate 25.4×6
R9.6
R38|| tt | | K | |R30
Figure 2 back plate and base
b) The mass is 34.0+23kg.
c) The deformation stiffness is 105~140N/mm. The deformation stiffness is calculated as follows: A
Unit: mm
40
R5
92#
With
17.7 | | tt | Line
Metal Xiang
Picture 3
Side of the human body module
1) Place the 380mm×100mm channel beam at the chest position of the human body module in Figure 4 (from the top of the head 457mm ± 6mm), the bottom of its channel beam is parallel to the back plate. A load of 22N is preloaded on the channel beam (including the gravity of the channel beam), and the position of the channel beam at this time is determined as the base push point (see Figure 4). 229
Back plate
GB 11557--1998
838
457±6
Trough beam for testing
100|| tt||Pressing direction
T7777
Figure 4 Schematic diagram of the human body module
2) Pressurize the channel beam at a speed of 250±50mm/min, and measure the benchmark from 1) The load pressure when the point displacement is 12.7mm.
3) Calculate the deformation stiffness based on the load pressure and displacement measured in 2). Deformation stiffness =
d) The center of mass is 551mm ± 6mm from the top of the head.
Load pressure
Displacement
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...(2)
e) The moment of inertia around the horizontal axis through the center of mass is 226 N·cm·s2±22 N·cm·s2 (23.0kgf·cm·s2±2.3 kgf.cm + s2).
4.2.1.2 Impact testing machine
The impact testing machine should have the following functions:
a) The impact testing machine can carry the translational motion of the human body model to impact the car steering wheel; b) It can record Impact speed, impact load, and impact moment in the test. 4.2.2 The steering mechanism is installed as follows according to the designed base thrust position (Figure 5). Steering wheel rim plane
Pressure sensor
Advanced strike
Seat reference point (R)
Steering axis angle
《Decided according to the design drawing]| | tt | |tt||Parallel lines on the longitudinal center plane
Strike direction
Parallel to the center line of the vehicle
(b) Top view
Human body module
Fig. 5. The relationship between the steering mechanism and the human body module and the impact force diagram 230
GB 115571998
4.2.2.1 The steering mechanism simulates the actual vehicle assembly state and is installed on the assembly frame. 4.2.2.2 The assembly angle shall be installed according to the design reference angle, and the deviation shall be controlled within 2°. 4.2.2.3 If the steering mechanism has a position-adjustable device, the position of the steering mechanism should be fixed at the design reference position. 4.2.2.4 Place the pressure sensor between the steering shaft and the rotating disc. 4.2.2.5 In the longitudinal plane of the driving trunk line of the human body module, turn the position of the steering wheel rim to the two parts with the largest and smallest stiffness of the steering wheel to collide with the human body module.
4.2.3 The relationship between the steering device and the human body module The positional relationship between the human body module and the steering mechanism in the up and down direction is shown in Figure 5. According to the design drawing, the distance between the human body module baseline and the lower end of the steering wheel is calculated. Install the human body module at a position that meets this distance, and place the human body module in the center of the rim plane of the steering wheel in the left and right directions.
4.2.4 Impact direction
Install the steering wheel and human body module according to 4.2.3, so that the human body module translates and hits the steering wheel at the impact speed specified in 4.2.5. The direction of impact is parallel to the longitudinal center plane of the vehicle body, and the human body module is in a free and unconstrained state at the moment of impact. 4.2.5 Impact speed
The impact speed is 25±1km/h. If the impact speed in the test is higher than this value, and the steering mechanism still meets the requirements of 3.2, the test shall be considered valid.
4.2.6 Measurement of force
When impacting the steering wheel in the horizontal direction and parallel to the longitudinal centerline of the vehicle (see Figure 5), measure the force (maximum value) acting on the steering wheel. Force can be measured directly or calculated from other parameters measured during the test. 4.2.7 Measurement accuracy
4.2.7.1 The impact velocity measuring device is within 2% of soil. 4.2.7.2 Impact velocity resolution is 0.5km/h. 4.2.7.3 The impact load measuring device shall be within ±5%. 4.2.8 Test records
The test should record the following contents:
a) test date,
b) test location.
c) Parameters of the test piece
1) Vehicle name and model:
2) Parts name or part number. d) Test conditions
1) Impact load sensor used;
2) Side angle (α) and plane angle (β) of the steering shaft; 3) Rotation position of the steering wheel; ||tt ||4) The distance between the lower end of the steering wheel rim and the baseline of the human body module. e) Test results
1) Impact speed;
2) Impact load;
3) Impact moment:
4) Others.
281
6 Measurement of force
When hitting the steering wheel in the horizontal direction and parallel to the longitudinal centerline of the vehicle (see Figure 5), measure the force (maximum value) acting on the steering wheel. This force can be measured directly or Calculated based on other parameters measured during the test. 4.2.7 Measurement accuracy
4.2.7.1 The impact velocity measuring device is within 2% of soil. 4.2.7.2 Impact velocity resolution is 0.5km/h. 4.2.7.3 The impact load measuring device shall be within ±5%. 4.2.8 Test records
The test should record the following contents:
a) test date,
b) test location.
c) Parameters of the test piece
1) Vehicle name and model:
2) Parts name or part number. d) Test conditions
1) Impact load sensor used;
2) Side angle (α) and plane angle (β) of the steering shaft; 3) Rotation position of the steering wheel; ||tt ||4) The distance between the lower end of the steering wheel rim and the baseline of the human body module. e) Test results
1) Impact speed;
2) Impact load;
3) Impact moment:
4) Others.
281
6 Measurement of force
When hitting the steering wheel in the horizontal direction and parallel to the longitudinal centerline of the vehicle (see Figure 5), measure the force (maximum value) acting on the steering wheel. This force can be measured directly or Calculated based on other parameters measured during the test. 4.2.7 Measurement accuracy
4.2.7.1 The impact velocity measuring device is within 2% of soil. 4.2.7.2 Impact velocity resolution is 0.5km/h. 4.2.7.3 The impact load measuring device is within ±5%. 4.2.8 Test records
The following items should be recorded during the test:
a) test date,
b) test location.
c) Parameters of the test piece
1) Vehicle name and model:
2) Parts name or part number. d) Test conditions
1) Impact load sensor used;
2) Side angle (α) and plane angle (β) of the steering shaft; 3) Rotation position of the steering wheel; ||tt ||4) The distance between the lower end of the steering wheel rim and the baseline of the human body module. e) Test results
1) Impact speed;
2) Impact load;
3) Impact moment:
4) Others.
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