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davio

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Ho usato anche io Gooooooooooogle e vediamo un po' che cosa ho trovato:

 

1952

 

Disc brakes: Modern-type disc brakes, designed by Dunlop, were fitted to the Jaguar entries in the 1952 Mille Miglia. They were subsequently used on the C-Type that won the Le Mans in 1953 and were fitted as standard to the Jaguar D-Type and Austin-Healey 100S in 1954. The Jensen 541 had disc brakes on all four wheels in 1956.

 

1954

 

The CitroÃ"n DS appears on the scene with active self-levelling, rising rate fully independent hydro-pneumatic suspension, self levelling lights, clutchless gear change, removable composite body - fibreglass, aluminium, stainless steel, plastic and steel. CD factor - approx.33, inboard disc brakes, automatic variable braking between front and rear to compensate for load, zero scrub power steering, positive power braking, energy absorbing crash protection sections.

 

 

Del 53 non dice nulla, a livello di novità....

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Chrysler was the first to widely introduce the disc brake in its cars in the early 1950's. The system did not have much success. It seemed that the brake pressure required of the driver was still a little to great for the system to gain widespread consumer acceptance and therefore it was dropped. It finally took the failing automaker Studebaker to reintroduce the system in 1964. This time it saw much more success and in a few years, disc brakes were common on most new cars.

 

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Ancora, sempre spulciando Google, ho trovato il fatto che in effetti esistevano già una sorta di freni a disco negli U.S.A. nel 1950, montato sulle Chrysler Town & Country e Crown Imperials.

Si tratta però di un sistema differente dal freno a disco come si intende oggi (quello appunto che comparve per la prima volta sulla DS).

cutaway.jpg

 

Tratto da: "The Complete History of Chrysler Corporation 1924 - 1985" di Richard Langworth:

 

The 1950 Town & Country and Crown Imperials featured a novel innovation: four-wheel disc brakes, built by Auto Specialists Manufacturing Company (Ausco) of St. Joseph, Michigan, under the patent of inventor H. L. Lambert. Unlike today's caliper disc systems, the Ausco-Lambert brakes employed twin discs that spread apart to rub against the inner surfaces of a cast-iron drum, which served as a brake housing. They were "self-energizing" in that some braking energy contributed to braking effort. When the disc make initial contact with the friction surface, small balls set into oval holes leading to the surface apart to augment braking energy. The effect was lighter pedal pressure than caliper discs, plus less fade, cooler running, and more friction surface than comparable drum brakes. Because of its high production cost, the all-disc system was standard only on the 1950 Town and Country and on Crown Imperials through 1954. It was a $400 option on other Chryslers, and thus rarely ordered. Current owners of cars so equipped consider the A-L brakes reliable and very powerful, but grabby and oversensitive.

 

 

 

Ergo direi che è giusta sia la versione di Paradise, che quella della DS.

 

 

brakes.jpg

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Ehm..io intendevo "la prima auto". Non la prima che abbia utilizzate l'impianto di freni a disco come lo consideriamo oggi..

E' un po' come parlare del primo cambio automatico...ovvio che oggi anche il tipo più convenzionale sia BEN diverso dal primo.

No ?

 

No.

Perchè il funionamento del freno a disco cosiddetto Ausco-Lambert (e la sua modalità) è diverso dal funzionamento del freno a disco...

E' un po' come la differenza tra una vettura Tip-tronic ed una automatica standard...

 

Come detto, IMHO, le risposte possono essere entrambe valide...

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