(57) In a side door hinge mechanism in a motor vehicle, wherein a quadric crank chain
comprises: a front rotary link (14) interconnecting two points which are disposed
at the forward sides of a vehicle body (12) and a side door (13) as rotary centers
out of four points including two points disposed on the vehicle body (12) and spaced
apart from each other in the longitudinal direction ofthe vehicle body (12) and two
points disposed on the side door (13) and spaced apart from each other in the longitudinal
direction of the side door (13); a rear rotary link (15) interconnecting two points
disposed at the rear sides as rotary centers; a portion between the two points on
the vehicle body (12); and a portion between the two points on the side door (13);
the rotary centers (14A, 14B) at opposite ends of one of the rotary links (14, 15)
are arranged longitudinally in the vertical direction of the vehicle body (12) to
form a rotary shaft (14A) inclined at least to one side so that the upper end portion
of the side door (13) can be inclined outwardly in the widthwise direction of the
vehicle body (12) when the side door (13) is opened, while, the rotary centers at
opposite ends of the other ofthe rotary links (14,15) are formed into ball joints
(15A, 15B) having degrees of freedom also in the vertical direction of the side door
(13).
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