| 摘要 |
A moulded structural tub for a vehicle, the tub having: a main compartment bounded by a first lateral wall, a second lateral wall, and a floor extending between the lateral walls; a strengthening member integral with the first lateral wall and projecting in a longitudinal direction from the first lateral wall towards the second lateral wall; the profile of the surfaces of the main compartment being such that, in any cross-sectional plane parallel to the longitudinal direction and perpendicular to the plane generally defined by the floor, the length of a line drawn in that cross-sectional plane between a fixed point on that part of the strengthening member closest to the second lateral wall, and a movable point confined to the profile monotonically increases in length as the movable point on the profile is moved in a generally longitudinal direction so as to trace from the fixed point along the profile of the first lateral wall, the floor and the second lateral wall in an unbroken set of points representing the cross-section of the surfaces of the main compartment in that cross-sectional plane; wherein each of the said cross-sectional planes which meet the surface of the floor in the main compartment intersect the floor once along a single continuous line or at a common plane. |
