Speed reducer with friction wheel for machines rotating at a hig

Details Speed reducer with friction wheel for machines rotating at a hig Speed reducer with friction wheel for machines rotating at a hig

1992-02-18

1993-08-24

Wright, Dirk

Planetary gear transmission systems or components

Planet pinion is friction gear

F16H 1308

Patent

active

052384594

DESCRIPTION:

BRIEF SUMMARY
The object of the present invention is a speed reducer with friction wheels in which the force of application necessary for said wheels is produced by its own operation.
The technical field of the invention is that of devices suitable for capturing the rotary mechanical energy produced by any driving machine, but more particularly when the speed of rotation of said machine is very fast, as is true of steam and gas turbines. In fact, for these turbo-motors, compactness and lightness have as their counterpart very high speeds of rotation exceeding the limit of use of the existing coupling and reduction means, particularly those with gears.
One device intended for this type of application is already know: it is an epicycloidal induction coupler-reducer for machines of very high speed of rotation, described in European Patent 0 161 194 in which the electromagnetic induction is primarily used to capture, at the price of slippage, the mechanical energy of very high speed of rotation in the primary part. On the secondary one, another electromagnetic action transmits the captured torque, but with the assistance of a purely mechanical rolling and rotary friction effect contributed by the centrifugal force acting on its inductor satellites, which are relatively heavy.
The present invention is directed at making an improvement in this prior-art device by a simple design of better efficiency by avoiding electromagnetism, since the latter involves not only a difficult and expensive construction but also, in particular, losses of energy which can scarcely be reduced, as a result of slippage, Joule effect, hysteresis and Foucault currents and therefore a substantial release of heat, which makes cooling means necessary.
The reducer device which forms the object of the present invention employs primarily friction wheels which are strongly applied against each other by radial forces generated upon the placing in rotation of its mobile unit.
The use of friction wheels in order to capture and transmit a torque is known, and numerous friction speed-reducing devices are known, in particular from French Patent 2 205 974 and its Certificate of Addition 2 211 088 which concern a friction epicycloidal reducer which also has planetaries, but in which the force of application of the friction wheels results from the clamping of elastic belts and not from forces related to the operation of the machine as a result of its rotation.
An epicycloidal reducer with centrifugal blocking is also known from French Patent 2 566 868, it having weights which generate a centrifugal effect, but this effect, which is related to rotation, has the purpose there of obtaining a uni-directional drive in case of reversal of the power entrance between the primary and the secondary, and not of producing the forces of application necessary for friction wheels.
As compared with the process employed in the device according to European Patent 0 161 194 using electromagnetic induction, the present invention resides essentially in the means of reversing the direction of the centrifugal force generated by the orbital rotation of the planetaries in order that it also acts, but centripetally, on the drive shaft of high velocity which is located in central position and that, finally, all these primary and secondary friction wheels are applied rather strongly against each other in order to be able to capture and effectively transmit the drive torque without slippage, at least to a certain extent, determined, among other factors, by the materials employed and the dimensioning selected.
As these friction wheels must be perfectly circular, free of roughness and non-deformable under the application force and the milling continuously suffered in rotation, the use of treated and polished hard steel is, first of all, adopted in the form, for instance, of rings coming from "NU" industrial bearings with rollers of special case-hardened steel which are perfectly smooth. However, a very low coefficient of friction results from this so that a very high application force is necessar

REFERENCES:
patent: 3254546 (1966-06-01), Nasvytis
patent: 3267771 (1966-08-01), Bugg
patent: 3364761 (1968-01-01), Nasvytis
patent: 3367214 (1968-02-01), Nasvytis
patent: 3433099 (1969-03-01), Nasvytis

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