Abstract: A transmission unit for a hybrid motor vehicle, has a planetary gearing. The planetary gearing is fitted with a first planetary wheel set and a second planetary wheel set. The transmission unit also includes an electric machine, which is coupled with a component part of the planetary gearing, and a plurality of switching devices, each of which forming a brake or a clutch, and each being movable between an activated position and a deactivated position. The switching devices are operatively installed for switching various transmission ratios between an input, which can be coupled with an internal combustion engine, and an output, and/or between the electric machine and the output.

Abstract: A transmission unit for a hybrid motor vehicle, includes an input shaft that can be connected to an internal combustion engine, a planetary gearing, which can be coupled to the input shaft, the planetary gearing having a first planetary wheel set and a second planetary wheel set, a first electric machine the rotor of which is rotationally fixedly coupled to the input shaft, a second electric machine which is coupled with a component part of the planetary gearing, and no more than four switching devices, each of which forms a brake or a clutch, and each can be moved between an activated position and a deactivated position. The switching devices are used for switching various transmission ratios acting between the input shaft and an output shaft and/or between the second electric machine and the output shaft.

Abstract: A transmission unit for a hybrid motor vehicle, has a planetary gearing. The planetary gearing is fitted with a first planetary wheel set and a second planetary wheel set. The transmission unit also includes an electric machine, which is coupled with a component part of the planetary gearing, and a plurality of switching devices, each of which forming a brake or a clutch, and each being movable between an activated position and a deactivated position. The switching devices are operatively installed for switching various transmission ratios between an input, which can be coupled with an internal combustion engine, and an output, and/or between the electric machine and the output.

Abstract: An automatic transmission for a hybrid vehicle, includes: an input shaft (AE) driven by the heat engine; an output wheel, ring gear or pinion (RCPS); a stationary element (ES), such as a casing; an electric motor (ME) in which the stator (ST) is rigidly connected to the stationary element (ES); and at least first, second and third members for selective torque transmission (C13; C234; C12-E2), which can be engaged or activated selectively in order to establish different transmission ratios. The automatic transmission also includes a single Ravigneaux double planetary gear set (TPR) in which the functional elements that make up same are arranged in two stages of planetary gear sets (ET1 and ET2) connected by the aforementioned members to the input shaft (AE), to the rotor (RO) of the electric motor (ME) and to the stationary element (ES).

Abstract: An automatic transmission for a hybrid vehicle, includes: an input shaft (AE) driven by the heat engine; an output wheel, ring gear or pinion (RCPS); a stationary element (ES), such as a casing; an electric motor (ME) in which the stator (ST) is rigidly connected to the stationary element (ES); and at least first, second and third members for selective torque transmission (C13; C234; C12-E2), which can be engaged or activated selectively in order to establish different transmission ratios. The automatic transmission also includes a single Ravigneaux double planetary gear set (TPR) in which the functional elements that make up same are arranged in two stages of planetary gear sets (ET1 and ET2) connected by the aforementioned members to the input shaft (AE), to the rotor (RO) of the electric motor (ME) and to the stationary element (ES).

Abstract: A ravigneux gearset is provided for automatic transmissions. In order to provide a Ravigneaux gearset for which ?1<0, ?2<0, and K<0 and with better efficiency and more clearance between the gears, a ravigneaux gearset is provided in which P1 transmits the power from S1 to R1 and P2 transmits the power from S2 to R2, LP1 meshing with P1 and LP2 meshing with R2. An alternative ravigneaux gearset is provided in which P1 transmits the power from S1 to R1 and LP2 transmits the power from S2 to R2 and wherein LP1 is meshing with P1.

Abstract: A transmission is provided having a planetary gearset having respective first, second, and third members, and a compound gearset having respective first, second, third, fourth, and fifth members. The transmission also includes a plurality of selectively engageable torque transmitting devices configured to selectively interconnect selected members of the planetary gearset and the compound gearset for unitary rotation thereby to provide a plurality of forward speed ratios and at least one reverse speed ratio between an input member and an output member.

Abstract: A transmission is provided having a planetary gearset having respective first, second, and third members, and a compound gearset having respective first, second, third, and fourth members. The transmission also includes a plurality of selectively engageable torque transmitting devices configured to selectively interconnect selected members of the planetary gearset and the compound gearset for unitary rotation thereby to provide a plurality of forward speed ratios and at least one reverse speed ratio between an input member and an output member.

Abstract: A power transmission incorporates an input planetary gearset and an output planetary gearset, which are interconnected by a plurality of torque-transmitting mechanisms to establish at least seven forward speed ratios. The input planetary gearset has one member selectively connected with the input shaft and another member continuously connected with a stationary member. The output planetary gearset has one member continuously connected with the output shaft and a plurality of the members interconnected either with a stationary member through the torque-transmitting mechanisms or with the third member of the input planetary gearset to the torque-transmitting mechanisms, or with the input shaft through a torque-transmitting mechanism.

Abstract: A transmission is provided having a planetary gearset having respective first, second, and third members, and a compound gearset having respective first, second, third, fourth, and fifth members. The transmission also includes a plurality of selectively engageable torque transmitting devices configured to selectively interconnect selected members of the planetary gearset and the compound gearset for unitary rotation thereby to provide a plurality of forward speed ratios and at least one reverse speed ratio between an input member and an output member.

Abstract: A transmission is provided having a planetary gearset having respective first, second, and third members, and a compound gearset having respective first, second, third, and fourth members. The transmission also includes a plurality of selectively engageable torque transmitting devices configured to selectively interconnect selected members of the planetary gearset and the compound gearset for unitary rotation thereby to provide a plurality of forward speed ratios and at least one reverse speed ratio between an input member and an output member.

Abstract: A power transmission incorporates an input planetary gearset and an output planetary gearset, which are interconnected by a plurality of torque-transmitting mechanisms to establish at least seven forward speed ratios. The input planetary gearset has one member selectively connected with the input shaft and another member continuously connected with a stationary member. The output planetary gearset has one member continuously connected with the output shaft and a plurality of the members interconnected either with a stationary member through the torque-transmitting mechanisms or with the third member of the input planetary gearset to the torque-transmitting mechanisms, or with the input shaft through a torque-transmitting mechanism.

Abstract: The present invention provides a tapered gear tooth apparatus and method. According to a preferred embodiment, the apparatus includes a generally annular internal gear having a plurality of internal gear teeth. The internal gear teeth define a generally tapered cross section. The apparatus further includes a generally annular external gear having a plurality of external gear teeth. The external gear teeth define a generally parallel cross section. The external gear teeth engage the internal gear teeth of the internal gear such that the external gear teeth are aligned with the internal gear teeth when a positive or negative input torque is applied.