1: Regulations (1) License plate installation laws and regulations: GB15741-1995 License plate and chassis of the car and trailer Main contents: The plate number on the front license plate shall be vertical or approximately perpendicular to the longitudinal symmetry plane of the vehicle; The midpoint of the number plate shall not be located to the left of the longitudinal symmetry plane of the vehicle and the front number plate shall not exceed the right edge of the front of the vehicle.The number plate mounted on the front plate shall be substantially perpendicular to the horizontal plane and the front elevation of the front plate shall not exceed 15 degrees. Rear license plate position: The plate mounted on the rear license plate should be vertical or approximately perpendicular to the vehicle longitudinal symmetry plane, the midpoint of the rear license plate shall not be on the right side of the longitudinal symmetry plane of the vehicle, and the rear license plate and license plate bracket shall not exceed Rear left edge of the vehicle GA36: People's Republic of China Motor Vehicle Number plate Large car: Front: 440 × 140 Rear: 440 × 220 Trailer: 440 × 220 Small license plate size: 440 × 140 (2) Why can not hook installed in the middle? Because the tow hook is mounted on the frame rail, while the vertical beam is divided on both sides. Longitudinal beam stress much stronger than the beam, but also to avoid frame deformation. Before and after the tow hook must be placed on the same root beam, so before and after the force in a line, so frame deformation.
2: why the tow hook on the right? (1) Because of driving on the right, the vehicle has more subsidence on the right than on the left.
(2) Another reason is that when being towed, it can be leftwardly shifted so as to make the front and rear drivers observe each other. (3) Fog lamp regulations (with light surface)
(4) Exterior Projection Laws and Regulations: GB11566-2009 Passenger Car Exterior Projections ECE-R26-2007 External Projections External Projections are applicable to components above the bottom line and not higher than 1.8m. Car body surface convex parts fillet radius of not less than 2.5mm. In working conditions, can not be 100mm diameter ball contact with parts, does not apply the regulations. Grille: When the gap width between 25-40mm, fillet radius of not less than 1mm, the gap width of less than or equal to 25mm, fillet radius of not less than 0.5mm.
Main Contents: The fillet radius of protruding parts on the outer surface of the body should not be less than 2.5mm. (Not applicable) 1.5mm above the outer surface of the body and 1.5mm above the outer surface, 5mm below the part but the outward part is a smooth part of the body contour line with the front bumper or rear bumper curve coincides with the vertical projection, In the vehicle body from the front (rear is the rear) of the body contour line 20mm and the outer contour of the vehicle and the vehicle vertical longitudinal symmetry plane at 15 degrees angle tangent two perpendicular plane tangent to the area, The fillet radius of all points shall not be less than 5mm and not less than 2.5mm in other cases.
(5) Proximity angle of front bumper: The maximum angle between the horizontal plane and the plane cut at the outer edge of the front tire (static load). Any rigid parts fixed on the vehicle in front of the front axle shall not be below the plane . The larger the angle of approach, the better the passability. The approach angle is related to the front car suspension and the ground clearance of the vehicle. At the moment I know, the Cadillac SRX has only 11 degrees of approach (ground clearance 20mm) and Hummer has 51 degrees of approach (11.5in of ground clearance).
2: Plastic Parts Bumper Assembly Material Selection, Process Part Name Material Selection Molding Process Surface Treatment Mold Cavity Bumper Body PP + EPDM-TD15 Injection Molding Spray One Die One Bumper Upper Grille ABS or PP + EPDM-TD20 injection molding striae, if plated and then spray, you must choose the conductive ABS one by one bumper grille ABS or PP + EPDM-TD20 injection molding striae, if the plating after spraying, then Must choose Conductive ABS One-piece chrome-plated two-brilliance ABS injection molded chrome-plated one-piece and fender mounting bracket POM injection molding no two pieces
Bumper body general material selection PP + EPDM-TD15 material. Spraying parts generally require a mold angle of 1 degree or more, dermatome requirements 3-5 degrees of the mold angle, rib requirements 0.5, and stiffener thickness control in the basic wall thickness of 1 / 3-1 / 2 or less. Avoid shrink marks.
3: The front bumper assembly and the surrounding parts with the installation
1: bumper and fender installation here mainly consider the gap between the bumper and fender off, we DTS requirements, clearance control in the 0.5mm, the difference within 0.5mm. Bumper and fender with the main through the mounting bracket, we use the Citroen C5 type (a lot of Japanese cars also use the structure). In the vertical direction of the fender, install two mounting screws and two mounting screws in the Y direction to secure the mounting bracket. Bumper stuck on the mounting bracket. In this way, the installation is firm and the bumper is easy to disassemble and assemble.
2: bumper and front cover bumper and front cover, we control the safety clearance 5-8mm. If you can block the gap, we require about 10mm.
3: Bumper body and grille installation grid installation will use the guide design, easy to install. Grille and bumper body with clip installation. Sometimes, in order to install a solid, it will be designed screw installation.
4: The bumper relates to the pedestrian protection safety regulations. We design the space for energy absorption. The safety clearance between the bumper assembly and the energy-absorbing box is 20mm.
5: Grille air intake: grille air intake depends mainly on the engine displacement and condenser, radiator power, the general examination of the cooling area, we take: 22% -30%.