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| J Costa Variators |
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The Drive Transversal J. Costa
The drive Transversal J.costa is a drive that is conceptually not too far from the drive roller, but with a number of features not only the simplified but that improve the functioning. Based on a structure like that of a conventional automatic change in the drive Transversal change the dish outside the pulley conductive, the bell and the rollers (which, as we shall see, no longer rollers).
. In the drive Transversal no ramps or rollers: the dish mobile pulley has a series of holes inclined from the inside out, distributed radially, which housed a sliding masses in the form of a finger, and instead turn , Leaving pushed outward by centrifugal force. Upon leaving, pushing the hood of strength and compel the dish that contains a scroll sideways and close the pulley by varying the diameter of the belt. In that drive the hood of force occurs in a simple but vitally important to define the behavior of the drive, since according to the profile and as the "attacking" the masses sliding, the drive will close one way or another pulley.
Variador convencional: Variable conventional:
Current drive roller is the system used by all major brands, and therefore the most widespread. . The pulley ride a bell for the outside of the dish outside. The dish and set about accommodations bell shaped ramp for those who slip a few pesos denominated cylindrical rollers. Pushed by the centrifugal force these rollers moving outwards to exert a force on the ramps between the resting forcing the plate to move abroad, squeezing the neck of the pulley and increasing the diameter of work of the strap. This will cause a change in the gear ratio to one of longest. When the engine turns lower rollers stop pushing the dish outside the pulley, quay pulley driven recover and return to a more short.
Dishes of pulleys are usually aluminum, steel bell, rollers and plastic with a metallic core. All revolve sympathetic to the engine, connected through the clutch. . It is clear that the weight of the rollers is very important and is closely related to the behaviour of the engine; rollers need a slight speed superior to the centrifugal force (proportional to the mass) allows close the pulley. Using light rollers get a drive pulleys that closes higher returns, a relationship of exchange generally shorter and an engine with more nerve. Instead, with heavy rollers, the drive will open soon, the pulley is closed to a lesser regime and the relationship is generally longer and touch the engine will be calmer.
A similar importance is shaped like ramps where are the rollers, as they also clearly influenced the behaviour of drive and the way it distributes the thrust of the engine in different regimes of rotation.
The Advantages and Peculiarities
The advantages of variable Transversal go beyond the simplicity constructive. Obviously the assembly does not increase engine performance in itself, but improves the performance of the motorcycle, since the design of the profile of the bell of force and how the masses sliding bearing allow an increase in the range of desmultiplicaciones. The drive Transversal obtain permits, there is a series of drive, a shorter at low rpm (better acceleration), and a relationship where the longest drive is fully opened (closed pulley), thereby allowing the engine turn more relaxed when circulates in plain, and improving the tip if we drive downhill. While the engine as we said never give more power, allowing the drive Cross is to increase the values of power to the wheel, at any speed but especially in the range of low to medium speed, improved (in many cases dramatically) accelerations. Why this happens?. Simply because thanks to the design of the whole bell / masses sliding the engine turns ever more cheerful and close to maximum torque speed with which the drive series, and this simply means having more power to the wheel and ultimately increase performance of the whole. Another advantage intrinsic to the design of this element is the smoothness of operation, especially in the models for 4-stroke engines. It is well known in the 4-stroke engine cycle only one of every 4 laps piston is driving, so each of two rounds which makes the whole crankshaft, in turn tracciona and other tour of inertia, ie that the shift is slightly irregular, and this particular note at idle drives where the roller ring with a metal campaneo typical, whereas with the drive Transversal going fine (as a silk) because of the simplicity constructive. The lack of internal friction to drive cross gives a better touch and a rapid response higher respect for the drive roller; to have no contact between bell and pulley outside rather than the sliding of the masses, to cut gas pulley closes in almost instantaneously, while in a classic drive, bell and pulley are guided by some intermediate elements that hinder the relative motion of two pieces and delaying the closing and opening of the pulley. Besides all the virtues described, the drive has succeeded Transversal maturity to ensure adequate maintenance and longevity comparable (if not better) to that of conventional rollers, and the quality of materials and mechanized with whom we work done This invention a secure and reliable performance contrasted.
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