Land vehicles: bodies and tops – Bodies – Body shell
Patent
1991-10-23
1993-05-04
Stormer, Russell D.
Land vehicles: bodies and tops
Bodies
Body shell
296209, B60R 2700
Patent
active
052074757
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a device at especially superficially situated hollow beams, eg. sill beams, contained in a car body, which beams in the lateral direction are made rigid by means of transverse frames.
BACKGROUND OF THE INVENTION
At lateral collisions the sill of a car is exposed to large stress, since they are often exposed to direct collision forces from the colliding vehicle. Since the forces also influences parts of the car body higher up, a torsional moment is generated, which makes the sill beam and the lateral beam to twist upwards, inwards. The car body therefore does not constitute the protection against lateral collisions as would be desireable.
The problem has been observed in many quarters and now there is detailed legislation relating to how large forces the car body should be able to absorb from the side. In order to counteract the above mentioned torsional tendencies, there have been attempts to among others inject isocyanates in the sill beam. This however gives problem with moisture and thereby corrosion in the long run.
It is previously known by self-supporting car bodies to arrange hollow beams, which are made rigid by transverse frames and/or diagonal frames inside the hollow beam. These beams in fact are effective, but increases the weight of the vehicle with quite a number of kilos, which cannot be accepted today. The division of hollow beams into a number of smaller cells also leads to an increasing risk for corrosion.
THE OBJECT OF THE INVENTION AND MOST IMPORTANT FEATURES
The object of the present invention is to provide a stiffening device of the kind mentioned by way of introduction, which stiffens the car body against lateral forces at lateral collisions, but also gives an improved stiffening at pitching and rolling movements.
An other object of the invention is that the stiffening device should have low weight, permit free passage of ventilating air and corrosion preventive means through the beam. Moreover the structure should be simple and be suitable for mass production and be designed such that it can be handled by a robot. These objects have been solved by each cross frame being formed by a tubular piece transverse to the longitudinal axis of the beam, said tubular piece at one end being provided with side flanges, which are firmly joined to the beam, and that the length of the tubular piece is at least somewhat shorter than the distance between opposite longitudinal sides, forming a free space between the other end of the tubular piece and one of the longitudinal sides of the beam.
DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail below with reference to the appended drawings, which show an embodiment.
FIG. 1 shows in perspective a passenger car body provided with hollow beams reinforced with cross frames according to the invention.
FIG. 2 shows in larger scale a section through the sill beam to the car body shown in FIG. 1.
FIG. 3 illustrates in perspective a cross frame according to the invention.
DESCRIPTION OF EMBODIMENTS
In FIG. 1 is illustrated a passenger car body provided with hollow sill beams 11 below the doors 12 and 13, and in which sill beam a number of cross frames 14 are provided, the position of which is indicated with reference designations 15.
The sill beam 11 in the embodiment shown in FIG. 1 and 2 has a section form, which is essentially constant, and which sill beam in cross section has the form of an irregular polyhedron adapted to the local conditions. The sill beam 11 consists of two halves 16 and 17, each provided with mounting flanges 18 and 19, which by means of spot welding are joined to each other forming a hollow beam. The vertical parting planes of the beam at the top and at the bottom are displaced with respect to each other. To one half 16 of the sillbeam is connected a cross beam 20 and to this mounted a floor 21. 22 designates a sill panel and 23 a number of cables hidden under the panel.
The cross frames inside the sill beam 11 are formed by tubular members 24 arranged transversally to th
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patent: 2327585 (1943-08-01), Ulrich
patent: 3132891 (1964-05-01), Pyuro et al.
patent: 4307911 (1981-12-01), Pavlik
patent: 4462633 (1984-07-01), Maeda
patent: 4892350 (1990-01-01), Kijima
AB Volvo
Hoge Gary C.
Stormer Russell D.
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