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US 2009/0023532 A1Published application
Continually variable transmission
AssigneePower Gear, S.L.
InventorJavier Parraga Gimeno
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AssigneePower Gear, S.L.
InventorJavier Parraga Gimeno
Estimating the term…
The invention relates to a transmission which is continually variable from an input shaft (E) to an output shaft (S), in which the input power is divided and transmitted along two parallel paths, namely a fixed ratio path and a variable ratio path, the respective speeds thereof being combined at an epicyclic output gear (7). The variable ratio path is formed by an epicyclic gear (5), a pulley variator (1, 2, 3) and an epicyclic gear (6) having two different ratios with which the brake (6.3) or coupling (6.5) is actuated. Two speed ranges (L and H) are provided at the output shaft (S). The L range passes from negative speeds to positive speeds, through a neutral point, when the variator ratio is reduced. The H range provides increasing positive speeds when the course of the variator is reversed. The passage between ranges L and H is synchronised at the point at which the speed of the intermediate shaft (5.3-6.5) is cancelled. The invention, which dispenses with the need for the standard reverse gear and clutch, can be used to obtain a wide variety of speeds for the output shaft (S).
Continual mechanical transmission of the type of transmission using variable speed device and in particular one of these having a conical surface and incorporating at least one epicyclical gear, characterised by a special construction of a transmission with power derivation to the outlet and to the main drive body, incorporating an intercalated differential mechanism which reduces the rotation speed of the intermediate shaft to zero in either direction, thus achieving continual transmission formed by the following elements, a drive, variable speed device, a differential mechanism, a reducer and an epicyclical gear so that the external drive is coupled to variable speed device, partially receiving the power from the motor shaft and provided with pulleys connected to the differential mechanism which transmits that power to the subsequently arranged reducer mechanism, so that the differential receives the two outlets presented by the continual variator, thus following the differential an outlet is obtained combining the two speeds with the reducer placed intermediately with respect to the other device so that by means of various fixation combinations of the constituent elements of the reducer, different transmission ratios are obtained which, together with the combination of pulley diameters, provide various outlet speeds to the differential shaft, with finally, an epicyclical mechanism whose final outlet shaft speed varies in any direction, reverse, forward, stopped, by means of a combination of different diameters of the drive pulley, together with various forms of interlocking of the reducer elements generating either a continual reduction, or a continual multiplication or a continual transmission ratio.
Mechanical continual transmission according to the previous claim characterised in that the external drive (1) is coupled to the variable speed device (2) and (3) connected to an epicyclical gear (5), partially receiving the power from the motor shaft, by means of a gear pinion(4) and with the tapered pulley (2) connected to the crown wheel (5.1) of an epicyclical gear (5) through transmission means (10) and (11), while the other pulley (3) is linked to the sun (5.2) and the satellite carrier (5.3) transmits this power to a subsequently arranged epicyclical gear (6) intermediate with respect to the other similar epicyclical gear (7) with the sun (6.1)of the epicyclical gear (6) coupled or interlocked (6.5) with the satellite carrier (6.2) of the epicyclical gear (6), in addition to which the satellite carrier (6.2) is coupled to an interlock (6.3) and its crown wheel (6.4) is connected to the sun (7.1) of the epicyclical gear (7) the satellite carrier (7.2) which is in turn connected to the outlet shaft (8) of the transmission, thus deriving from this the afore-mentioned fraction of the entry power to the two pulleys (2) and (3) while the crown wheel (7.3) of this third epicyclical gear (7) is made with the gear pinion (9) of the entry shaft.
Mechanical continual transmission according to previous claims, characterised in that in order to reduce the speed of the outlet shaft (8) of the epicyclical gear (7) to zero in any direction it is essential that the pulley (3) connected to the motor shaft is arranged close to the maximum diameter and that the sun (6.1) and the satellite carrier (6.2) of the epicyclical gear (6) are interlocked.
Mechanical continual transmission according to the previous claims characterised in that in order to obtain reverse gear, the pulley(3) should be positioned at its maximum diameter, with the interlocking (6.3) of the satellite carrier (6.2) disconnected and connecting the interlock (6.5).
Continual mechanical transmission according to the previous claims, characterised in that the forward gear makes a progression of pulley (3) diameters close to the maximum up to the diameter closest to minimum, and with interlock (6.3) of the satellite carrier (6.2) disconnected and with the interlock (6.5) connected, and in order to increase the outlet variation range, the fact that the differential outlet speed is zero when the pulley (3) approximates to the minimum diameter range is taken advantage of to stop the epicyclical gear satellite carrier (6.2), with the interlocking mechanism at zero speed of the intermediate shaft, and to increase the range of actuation, the progression of the pulley (3) in the opposite direction is varied, that is, from its minimum diameter to its maximum diameter.
Continual mechanical transmission according to the previous claims, characterised in that in applications with low torque requirement and/or reduced variation range, the epicyclical gear(6) may be dispensed with, thus joining the satellite carrier (5.3) of the epicyclical gear (5) with the sun (7.1) of the epicyclical gear (7).
Dependencies are inferred from the claim text.