Published at Wednesday, September 28th, 2016 - 22:11:13 PM. Door. By john.
Butterfly doors : Butterfly doors or vertical doors are a type of door sometimes seen on high-performance cars. They are similar to scissor doors. While scissor doors move straight up via hinge points at the bottom of the A-pillar, butterfly doors move up and out via hinges along the A-pillar. This makes for easier entry/exit at the expense of requiring more opening space than needed for scissor doors. The McLaren F1, Alfa Romeo 33 Stradale, Saleen S7, Enzo Ferrari and its non road-going version, the FXX, Toyota Sera/EXY-10, and the Mercedes-Benz SLR McLaren, among others, use butterfly doors. It was also a common feature for Group C and IMSA GTP/Camel Lights prototype racers as they incorporate teardrop tops which allows the driver to get in and out of the car more quickly than conventional and gullwing doors, especially in a cramped pitlane environment such as the pre-1991 Le Mans circuit. Since then, butterfly doors have been an adopted design of closed top sportscar racers, such as the Toyota GT-One, Bentley Speed 8 and more recently, the Peugeot 908 HDi FAP. The Toyota Sera, made between 1990 and 1995, was a limited-release car designed exclusively for the Japanese market which used this design. The Mercedes-Benz SLR McLaren Roadster was one of the few open top cars to use butterfly wing doors. This is made possible by having the doors hinged at the side of A-pillar instead of at top by the roof. The McLaren MP4-12C has a unique system where the butterfly doors do not use a top hinge meaning that the car can use frameless windows which allows for the cars convertible version to retain them.
Hinge terminology : Components : Pin The rod that holds the leaves together, inside the knuckle. Knuckle The hollow—typically circular—portion creating the joint of the hinge through which the pin is set. The knuckles of either leaf typically alternate and interlock with the pin passing through all of them. (aka. loop, joint, node or curl) Leaf The portions (typically two) that extend laterally from the knuckle and typically revolve around the pin. Characteristics End Play Axial movement between the leaves along the axis of the pin. This motion allows the leaves to rotate without binding and is determined by the typical distance between knuckles (knuckle gap) when both edges of the leaves are aligned. Gauge Thickness of the leaves. Hinge Width Length from the outer edge of one leaf to the outer edge of the other leaf, perpendicularly across the pin(aka open width). Hinge Length The length of the leaves parallel to the pin. Knuckle Length The typical length of an individual knuckle parallel to the pin. Leaf Width Length from the center of the pin to the outer edge of the leaf. Pitch Distance from the end of a knuckle to the same edge of its adjacent knuckle on the same leaf Slop A colloquialism referring to loose angular movement of the leaves relative to the pin.
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