Power train
First Claim
1. A power train, particularly for use in motor vehicles, comprising at least one engageable and disengageable clutch;
- fluid-operated means for engaging said at least one clutch;
an infinitely variable transmission in series with said at least one clutch, said transmission including a first rotary sheave arranged to receive torque from a prime mover, a second rotary sheave connected with said at least one clutch, and an endless flexible torque transmitting element trained over said sheaves, each of said sheaves comprising a first flange and a second flange movable axially toward and away from the respective first flange, said transmission further comprising first and second fluid-operated motors for the respective second flanges;
a torque sensor connected with the prime mover;
means for varying the ratio of said transmission;
at least one source of pressurized fluid;
a first circuit connecting said at least one source with said motors and with said torque sensor; and
a second circuit connecting said at least one source with said varying means and/or with said engaging means, said second circuit comprising an adjustable pressure regulating device.
2 Assignments
0 Petitions
Accused Products
Abstract
A power train for use in a motor vehicle has an infinitely variable transmission with two sheaves and a belt which is trained over the sheaves. The sheaves have fixed and axially movable flanges, and one of the sheaves is driven by the engine through a torque sensor. A first hydraulic circuit has a first pump which can supply pressurized oil to the hydraulic motors for the axially movable sheaves at a pressure determined by the torque sensor. A second hydraulic circuit has a second pump serving to supply pressurized oil to a further motor which varies the ratio of the transmission and to two friction clutches between the second sheave and an output member. The pressure of oil in the second circuit is determined by a pressure regulating valve which is adjustable by a control unit in dependency on one or more parameters of the engine. A first distributing valve can connect the second pump with the further motor and/or with one of the two clutches, and a second distributing valve can connect the first distributing valve with the one or the other clutch. One of the clutches can drive the output member in a first direction, and the other clutch can drive the output member by way of a planetary in a second direction counter to the first direction.
35 Citations
28 Claims
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1. A power train, particularly for use in motor vehicles, comprising at least one engageable and disengageable clutch;
- fluid-operated means for engaging said at least one clutch;
an infinitely variable transmission in series with said at least one clutch, said transmission including a first rotary sheave arranged to receive torque from a prime mover, a second rotary sheave connected with said at least one clutch, and an endless flexible torque transmitting element trained over said sheaves, each of said sheaves comprising a first flange and a second flange movable axially toward and away from the respective first flange, said transmission further comprising first and second fluid-operated motors for the respective second flanges;
a torque sensor connected with the prime mover;
means for varying the ratio of said transmission;
at least one source of pressurized fluid;
a first circuit connecting said at least one source with said motors and with said torque sensor; and
a second circuit connecting said at least one source with said varying means and/or with said engaging means, said second circuit comprising an adjustable pressure regulating device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
- fluid-operated means for engaging said at least one clutch;
Specification