This standard specifies the procedure for determining the H-point position of a car seat using a three-dimensional H-point device. This standard applies to the design and inspection of any car where the vertical distance between the driver's heel point and the R point is less than 550mm, the backrest tilt angle is greater than 5°, or the angle between the thigh centerline represented by the thigh bar and the horizontal line is greater than 5°. GB/T 11563-1995 Procedure for determining the H-point of a car GB/T11563-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Procedure for H-point determination
Motor vehicles-Procedure
for H-point determination
GB/T 11563--1995
Replaces GB/T 11563-89
This standard is equivalent to the international standard ISO6549-1980 "Procedure for determining the H-point of road vehicles".
1 Subject content and scope of application
This standard specifies the procedure for determining the H-point position of vehicle seats using a three-dimensional H-point device. This standard is applicable to the design and inspection of any vehicle with a vertical distance from the driver's point to point R less than 550mm, a backrest inclination angle greater than 5°, or an angle between the thigh centerline represented by the thigh bar and the horizontal line greater than 5°. 2 Terminology
2.1 Three-dimensional H-point device
A device used to determine the H-point of a vehicle seat.
refers to the hinge center of the trunk and thigh of the three-dimensional H-point device, which is located on the center line of the device between the H-point marking buttons on both sides of the device.
2.2.1 "R point" or "sitting reference point" refers to the design H point specified by the manufacturer, which: a. determines the rearmost normal driving and sitting position of each design sitting position of the seat specified by the manufacturer, which takes into account all possible seat adjustment states (horizontal, vertical and tilted). Has coordinates established relative to the structure of the designed vehicle. b.
simulates the hinge center position of the human trunk and thigh. c.
d. serves as a reference point for placing a two-dimensional human body template. 2.2.2 The H point of the automobile seat
refers to the intersection of the trunk line and the center line of the thigh of the three-dimensional H-point device. It is measured using a three-dimensional H-point device. This device should select appropriate leg length data and be installed in the rearmost position of the normal driving or sitting posture of the seat specified by the manufacturer. The H point of the automobile seat is measured by the H-point marking button on the three-dimensional H-point device.
2.3 Trunk line
Refers to the center line of the head space detection rod of the three-dimensional H-point device. 2.3.1 Design backrest angle
Refers to the angle between the plumb line through point R and the trunk line of the two-dimensional human body model. 2.3.2 Actual backrest angle
Refers to the angle between the vertical line through point H and the trunk line measured by the backrest angle protractor located on the three-dimensional H-point device detection rod when it is in the final position.
2.4 Occupant center plane (C/LO)
Approved by the State Administration of Technical Supervision on November 16, 1995 and implemented on May 1, 1996
GB/T11563—1995
Refers to the Y coordinate plane of point H, represented by the center plane of the occupant at each specific position or the center plane of the three-dimensional H-point device. On a single seat, the center plane of the seat is the center plane of the occupant. In other seats, the center plane of the occupant is specified by the manufacturer. 2.5 Driver's point
refers to the intersection of the sleeping part of the three-dimensional H-point device with the floor covering or other supporting surface. If the leg length of the device uses the 95th percentile data, the sole of the device's foot should touch and allow the accelerator pedal to be depressed. The amount of travel of the accelerator pedal is specified by the manufacturer. If the leg length uses the 50th percentile data, the sole of the device may not touch the accelerator pedal. In this case, the feet are allowed to rest on the floor with the legs naturally stretched. At this time, the vibration point is specified by the manufacturer, and the seat should be in the rearmost position of the normal driving or riding posture. 2.6 Calf angle
refers to the angle between the center line of the right calf and the longitudinal tangent of the sole. This angle shall not be less than 87°. 3 Description of the three-dimensional H-point device
The back panel and seat panel of the three-dimensional H-point device (see Figure 1) are representative of the average back and buttocks contours of an adult man. These separate back and seat panels, made of reinforced plastic and metal, simulate the human torso and thigh and are mechanically hinged at the actual H-point. A protractor is fastened to the head space probe rod hinged at the H-point to measure the actual backrest angle. An adjustable thigh rod is attached to the seat panel to determine the centerline of the thigh and serve as a reference line for the hip angle protractor. The calf rod is also adjustable in length and is connected to the seat panel assembly at the T-bar to form the knee joint. The T-bar is actually a lateral extension of the adjustable thigh rod. In order to measure the knee angle, a protractor is installed in the calf rod. There are scales on the shoe and foot assembly to measure the calf angle. At the 50th and 95th percentiles of the adult male size, locating pins are installed on the thigh rod and calf rod. Two levels are used to locate the device in space. The weight representing the mass of each part of the human body is applied to the position of the center of gravity of the corresponding part, so that the seat is subjected to a gravity equivalent to the average mass of an adult man and deformed. The joints of the three-dimensional H-point device should be free to move. 448
GB/T11563-1995
Figure 1 Name of components of the three-dimensional H-point device
1-Back plate; 2-Trunk weight suspension, 3-Backrest angle level, 4-Buttocks angle protractor, 5-Seat plate: 6-Thigh weight pad; 7-T-bar connecting the knee joint; 8-Calf angle protractor: 9-Knee angle protractor, 10-Thigh bar, 11-Horizontal level; 12-H-point support shaft; 13-H-point marking button; 14-Backrest angle protractor; 15-Head space detection rod 4 Installation procedure of the three-dimensional H-point device
4.1 Prepare the vehicle according to the manufacturer's regulations and place it in a temperature environment of 20±10℃ to ensure that the seat material reaches room temperature. If the seat to be inspected has never been sat on, a person or device with the same mass as the three-dimensional H-point device should be allowed to sit on the seat for a trial so that the seat and backrest produce the required deformation. If the manufacturer requires, all seat assemblies should be kept unloaded for at least 30 minutes before the three-dimensional H-point device is installed. www.bzxz.net
4.2 The vertical and horizontal zero planes of the vehicle are determined according to the coordinate reference points specified by the manufacturer as the reference for body measurement. All adjustments are adjusted to the normal driving posture position specified by the manufacturer according to the position of point R. For seats with independent vertical adjustment or stupid hanging, their vertical position should be rigidly fixed in the normal driving posture position, and their horizontal position should be adjusted to the last position in the normal driving posture. 4.3 A sufficiently large piece of soft ordinary knitted cotton cloth or non-woven fabric with a unit area mass equivalent to 0.228 kg per square meter should be placed on the seat to be inspected to prevent the three-dimensional H-point device from contacting the seat. If the test is carried out on a test bench, a floor covering layer or other corresponding floor material of appropriate size should be placed under the feet of the three-dimensional H-point device. 4.4 Position the seat and back panels of the three-dimensional H-point device. Make the occupant center plane (C/LO) coincide with the center plane of the device. If it is positioned too far outwards and reaches the edge of the seat so that the device cannot remain horizontal, the device can be moved inwards relative to the occupant center plane (C/LO). When the three-dimensional H-point device has been moved inwards for a certain distance so that the device can remain horizontal, the distance from the vehicle center plane to the occupant center plane should be noted in the measurement record.
4.5 Adjust the calf rod of the three-dimensional H-point device to the appropriate length. 449
GB/T11563--1995
4.6 Install the foot and calf assembly of the three-dimensional H-point device on the seat panel assembly (it can be installed separately or using the T-bar and calf assembly). The straight line through the two H-point marking buttons should be perpendicular to the longitudinal center plane of the seat. 4.7 The position of the foot and calf of the three-dimensional H-point device should be set as follows. 4.7.1 Driver's Seat
4.7.1.1 When the 50th percentile data is used for leg length, both feet should be in a naturally stretched position. If necessary, they can be placed between the operating pedals. The device can be horizontally adjusted by adjusting the seat plate or the calf and foot assembly. Use a level to check. 4.7.7.2 When the 95th percentile data is used for leg length, the right foot and calf assembly should be placed on the accelerator pedal, with the foot supported on the floor, as far forward as possible, and the limit pin of the three-dimensional H-point device inserted into the foot assembly to ensure that the calf angle is not less than 87°. 4.7.1.2.1 The left foot should be placed on the floor or on the toe support, so that the distances from the left and right feet to the center plane of the device are roughly equal. The straight line passing through the H-point marking buttons at both ends should be perpendicular to the longitudinal center plane of the seat. 4.7.1.2.2 If the left foot cannot be supported by the structural part, so that the left and right calves cannot be kept parallel, the left calf rod can be loosened and the left foot can be moved until it can be rested. The straight line through the H-point marking buttons at both ends remains perpendicular to the longitudinal center plane of the seat, and then the positioning device of the calf rod is re-tightened.
4.7.1.2.3 When the calf angle is at the minimum value of 87°, if the post of the three-dimensional H-point device can only rest on the foot support and cannot reach the floor, the foot should be moved until the foot touches the intersection of the toe support and the floor covering, and then the foot is rotated until the sole of the foot contacts the accelerator pedal.
4.7.2 Passenger seats
4.7.2.1 Front outer seats: When the leg length uses the 50th percentile or 95th percentile data, refer to 4.7.1.1 or 4.7.1.2.
4.7.2.2 Rear Outboard Seats: When leg length is measured using the 50th or 95th percentile data for rear seats or auxiliary seats, the calf position shall be as specified by the manufacturer.
If the feet are uneven on the floor, the foot that first touches the front seat can be used as the reference to arrange the position of the other foot until the horizontal level indicator on the device indicates level. 4.7.3 Front and rear center seats
When determining the H point position for the center seat, if there is a tunnel on the vehicle floor, place the feet on either side of the tunnel. 4.8 Apply calf and thigh weights and level the three-dimensional H point device (see Figure 2). 4.9 Tilt the back panel forward to the front limit block, pull the device away from the seat back using the T-bar, and then use one of the following methods to re-place the three-dimensional H point device on the seat.
4.9.1 If the three-dimensional H-point device has a tendency to slide backward, allow it to slide until the seat plate contacts the seat back, and readjust the calf position if necessary.
4.9.2 If the three-dimensional H-point device has no tendency to slide backward, apply a horizontal backward thrust to the T-bar to slide it backward until the seat plate contacts the backrest.
4.10 At the intersection of the hip angle protractor and the T-bar housing, apply a force of 100±10N to the back plate and seat plate assembly along the line above the thigh bar housing at the above intersection (see Figure 2). Then replace the back plate on the seat back and prevent the three-dimensional H-point device from sliding forward in the subsequent process.
4.11 Install the left and right hip weights, and then alternately add eight torso weights to keep the three-dimensional H-point device horizontal (see Figure 2). 4.12 Tilt the backboard forward to eliminate the tension on the seat back. If the manufacturer requires it, shake the three-dimensional H-point device left and right three times in turn within a range of 10° (i.e. 5° on each side of the vertical center plane) to make the device fit the seat. When shaking, the T-bar of the device may leave the specified horizontal and vertical reference positions. Therefore, a moderate lateral force must be applied to the T-bar. When supporting the T-bar to shake the device, avoid adding accidental external loads in the vertical or front-to-back direction. In this step, the feet of the device should not have any constraints. If the feet change position, there is no need to adjust them for the time being.
Put the backboard back on the seat back and check whether the device is level. Since the feet move during the shaking process, their position needs to be readjusted as follows:
GB/T11563--1995
Lift the left and right feet off the floor to the minimum necessary height, until the legs no longer produce additional traction. When lifting the feet, the feet should be able to rotate freely without applying any forward or lateral load. When each foot is returned to the lowered position, the hub of the device should touch the support structure designed for it.
After completing the above steps, if the seat cannot remain horizontal, apply a lateral force on the top of the back plate to keep the seat of the device horizontal on the seat.
4.13 Pull the T-bar so that the three-dimensional H-point device cannot slide forward on the seat cushion, as follows: Place the back panel back on the seat back;
b At the three-dimensional H-point device detection rod at approximately the center height of the torso weight, alternately apply and remove a backward horizontal force not greater than 25N until the hip angle protractor indicates a stable position after the force is removed. No external downward or lateral load should be applied to the device at this time. If the device needs to be leveled again, move the back panel forward and repeat the steps described in 4.12. 4.14 Measure the coordinates of the vehicle seat H point relative to the three-dimensional coordinate reference. 4.15 If the three-dimensional H-point device needs to be reinstalled, the seat assembly should be kept unloaded for at least 30 minutes before reinstallation. The loading time on the three-dimensional H-point device assembly should not exceed the time required to complete the test. Trunk weight
Load direction and point
Thigh weight
Figure 2 Component dimensions and load distribution of three-dimensional H-point device Additional remarks:
This standard is proposed by China National Automotive Industry Corporation. This standard is under the jurisdiction of the National Technical Committee for Automobile Standardization. This standard is drafted by Changchun Automobile Research Institute. Qi Huiwen is the main drafter of this standard.
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