The main beam is composed of member connecting stringers around the frame. Torsional properties of the beam itself and beams distributed on the frame, the frame of the direct impact of stress and stiffness of the frame, the beam can be reasonably designed to ensure that the frame has sufficient torsional rigidity.
The trailer frame molding or stamping beam profiles directly from the former than the latter, 15% lighter and 20%, generally the former more widely adopted.
Common beam structure:
(A) a tube shape having a high torsional rigidity, but stringer section height is higher, so that the load is transmitted from the entire cross section of the beam to be many welding webs, it increases the mass of the frame, the high cost , complex process。 In addition, when reversing the more serious, the stress larger plate。 So tube-shaped beams generally arranged at both ends of the frame rails, near the wing, and enhance the overall torsional rigidity frame。
(2) I-shaped ideal for load transfer, but the stringer flange and beam flange connection, greater torsional constraints, and thus a larger flange stress generated.
(3) multi-grooved steel sheet metal forming, manufacturing process is simple, low cost, many manufacturers use, but poor torsional stiffness.
(4) box-shaped and tube-shaped beams have similar characteristics, with better torsional resistance.
To determine the size of the beam cross-section is usually analogy. From product serialization, standardization and universal consideration should be one, two sizes of beams, using the density in the arrangement of different ways to meet the requirements of various tonnage level trailer.
Beams in the layout, the spacing of 700 ~ 1200mm, depending on the actual situation may not follow this specification. The trailer is used in the beams of the U-shaped beam steel stamping. Through the beam, the front edge of the beam and the front beam using 8 # hot rolled channel steel.