It incorporates a built in 28 tooth ring gear which can work either as a bevel or a spur, similar to the 24 tooth crown gear. I decided the value of having independent suspension at the rear was of greater importance as a tribute to this model than a diff. A rack gear runs parallel to the axles. The rack uses the new ball joints at each end to attach to new tie rods. Click for an animation of the differential in motion. I think I prefer the control being on the dashboard to the original model, it feels more intuitive.
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Click the image to download the LDraw file of this model. Model by Koyan Set , released in , was the third generation auto chassis and improved upon the technology in the previous version, set , in many ways. It features a 4 cylinder reciprocating engine in a V configuration, a 3 speed transmission, a working rear differential, working front and rear double wishbone suspension, rack and pinion steering, retractable headlights, and adjustable and reclining seats.
This set introduced many firsts for Technic. This is the first Technic auto chassis to feature a body. The body, while crude, still gives the model shape. It also offers a wealth of parts. At almost pieces, this was the largest set to date and has 24 16L beams. This is the first set with true double wishbone suspension, and the first set to offer suspension of any type on the steered axle.
Several new parts are used on the front to accomplish the new suspension. This would be the last set to include the square pistons, which would soon be replaced.
This model is about the same physical size as the previous two auto chassis which remain, to this day, among the largest of all Technic models. The wheel axle passes through a pair of universal joints, then through a triplet of 16 tooth spur gears. Finally, a pinion drives a rack.
The rack uses the new ball joints at each end to attach to new tie rods. The tie rods connect to the new steering arms with more ball joints. The steering arm itself pivots on upper and lower king pins which fit into sockets in the control arms. In this Technic set, the steering employs the Ackerman Principle based on the shape of the new steering arms. You can see in the images that the tie rod attachments are not directly behind the kingpins, but are inboard.
The result of this is that the wheel on the inside of the turn is rotated more sharply than the wheel on the outside, which is exactly what is required for a turning in a proper circle without skidding.
Click for an animation of the steering in motion. Engine and Transmission This set features a rear mounted V-4 engine. This is the first set to feature an engine in a V configuration other than the special engines set The engine uses the offset axle holes of the 24 tooth gears to make a crankshaft.
Connectors placed end to end and clocked 90 degrees form rods which connect to 4 specialized 2x2 square pistons. The "cylinders" are actually square. Each pair of opposing cylinders shares a common crank pin. The engine also has a number of aesthetic features such as a pair of exhaust manifolds.
The color coded computer image shows the configuration in each gear. The version on the right is in neutral. The middle axle translates forward and back which allows different gears to mesh. The differential drives the wheels.
The gearbox is not synchronized in any way, so it is difficult to shift gears since they tend not to be aligned.
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Zu dem Set gab es neben der Bauanleitung noch zwei weitere Beilagen. Auf dem Titel der Bauanleitung wird kurz dargestellt, wie man die unterschiedlichen langen Kreuzachsen abmessen kann, denn eine jeweilige Darstellung wie in heutigen Anleitungen gibt es auf den folgenden Seiten nicht. Als weitere kleine Schwierigkeit haben die Kreuzachsen alle nur eine Farbe — schwarz! Damit ist das Chassis des Modells gelegt, was noch fehlt, sind Motor sowie die luftige Karosserie.
LEGO® Produktset: 8865-1: TECHNIC 8865 PKW Chassis (Technic / 1988)