Abstract: A power transmission apparatus configured for a vehicle, may include a motor/generator including a motor shaft a first input shaft selectively connectable to the motor shaft, a second input shaft externally disposed with the first input shaft and selectively connectable to the motor shaft, a third input shaft externally disposed with the second input shaft and selectively connectable to the motor shaft, a first torque mediating shaft formed as a hollow shaft and coaxially and externally disposed with the first input shaft without rotational interference therebetween, an intermediate shaft parallel with the first input shaft, a first shifting section receiving a torque and outputting the shifted torque, and a second shifting section including a first planetary gear set selectively receiving the torques from the first shifting section and the third input shaft, respectively, and outputting shifted torque through one gear set.

Abstract: A power transmission system of a vehicle may include a first input shaft selectively connected to an engine, a second input shaft as a hollow shaft, enclosing the first input shaft without rotational interference with the first input shaft, and selectively connected to the engine, a speed change portion including first and second planetary gear sets, each planetary gear set including three rotation elements, and four rotation shafts directly connected to at least one rotation element among the rotation elements of the first and second planetary gear sets, a motor/generator, an output shaft, and control elements including two clutches disposed at positions where the first and second input shafts are selectively connected to an output shaft of the engine, and two brakes disposed at positions where two rotation shafts among the four rotation shafts are selectively connected to a transmission housing.

Abstract: A power transmission apparatus for a vehicle may include a first input shaft directly connected to a motor/generator, a second and third input shafts coaxial and selectively connectable to the first input shaft, a torque mediating shaft coaxial with the first input shaft, an intermediate shaft and output shaft disposed in parallel with the first input shaft, a first shifting section receiving torque from the third input shaft and outputting a modified torque to the torque mediating shaft, a second shifting section including first planetary gear set, shifting torque of the first input shaft to output the shifted torque to the torque mediating shaft, and selectively stopping the torque mediating shaft, and a third shifting section including second planetary gear set, forming an output torque in combination of torques from the first and second shifting sections and the second input shaft, and outputting the output torque to the output shaft.

Abstract: A power transmission apparatus configured for a vehicle, may include a motor/generator including a motor shaft a first input shaft selectively connectable to the motor shaft, a second input shaft externally disposed with the first input shaft and selectively connectable to the motor shaft, a third input shaft externally disposed with the second input shaft and selectively connectable to the motor shaft, a first torque mediating shaft formed as a hollow shaft and coaxially and externally disposed with the first input shaft without rotational interference therebetween, an intermediate shaft parallel with the first input shaft, a first shifting section receiving a torque and outputting the shifted torque, and a second shifting section including a first planetary gear set selectively receiving the torques from the first shifting section and the third input shaft, respectively, and outputting shifted torque through one gear set.

Abstract: The present disclosure provides a hydraulic control system for an automatic transmission. The system includes: a linear solenoid valve configured to control a line pressure and to supply the line pressure to a coupling element, a shift valve to which an output hydraulic pressure of the linear solenoid valve is supplied, and a transmission control unit configured to control the shift vale and the linear solenoid valve.

Abstract: A power transmission apparatus for a vehicle may include a first input shaft directly connected with a motor/generator, second and third input shafts and torque mediating shaft coaxial and selectively connected with the first input shaft, a first intermediate shaft and first and second idle shafts in parallel with the first input shaft, a second intermediate shaft in parallel with the first input shaft, and selectively connected with a transmission housing, an output shaft in parallel with the first input shaft, and coaxial and selectively connected with the second intermediate shaft, a first shifting section including six gear sets, selectively receiving torque through the first and third input shafts, and outputting intermediate shift-stages, and a second shifting section including a planetary gear set, forming an output torque by combination torques from the first shifting section and the second input shaft, and outputting the output torque to the output shaft.

Abstract: A power transmission apparatus includes: a first input shaft always receiving an input torque from an engine; second and third input shafts coaxially disposed and selectively connected with the first input shaft; a torque mediating shaft selectively connected with the first input shaft or a transmission housing; first and second intermediate shafts and an output shaft respectively disposed in parallel with the first input shaft; a first preliminary shifting section receiving a torque through a first input gear set, selectively shifting the received torque, and outputting the shifted torque; a second preliminary shifting section including a second shifting gear set which outputs a torque from the first input shaft and stops ;and a compound shifting section forming an output torque by the input torque and the first and second shifted torques.

Abstract: A power transmission apparatus includes a first input shaft receiving an input torque, second and third input shafts coaxially disposed and selectively connected with the first input shaft, first and second torque mediating shafts coaxially disposed with the first input shaft, first and second intermediate shafts and an output shaft disposed in parallel with the first input shaft, a first shifting section receiving a torque from the third input shaft and outputting a plurality of first shifted torques, a second shifting section including a first planetary gear set selectively connected with the first input shaft and outputting a plurality of second shifted torques, and a compound shifting section forming an output torque by the input torque and the first and second shifted torques.

Abstract: Disclosed is a hydraulic pressure supply system of a dual clutch transmission for a vehicle in which by independently configuring a low pressure supply route and a high pressure supply route, the hydraulic pressure supply system can enable a low hydraulic pressure that is generated in a hydraulic pump for a low pressure to be supplied to a gear lubrication device and a clutch cooling/lubrication device and enable a low hydraulic pressure that is generated in a hydraulic pump for a high pressure to be supplied to a gear control device and a clutch control device.

Abstract: Nine forward speeds and one reverse speed are achieved by a power transmission apparatus for a vehicle including a double clutch, a plurality of input, output, and idle shafts, a plurality of gears fixed to or rotatable on the shafts, a plurality of synchronizers selectively synchronizing gears to the shafts.

Abstract: The present disclosure provides a hydraulic control system for an automatic transmission. The system includes: a linear solenoid valve configured to control a line pressure and to supply the line pressure to a coupling element, a shift valve to which an output hydraulic pressure of the linear solenoid valve is supplied, and a transmission control unit configured to control the shift vale and the linear solenoid valve.

Abstract: A planetary gear train includes input and output shafts, first to fourth planetary gear sets respectively having first to third, fourth to sixth, seventh to ninth, and tenth to twelfth elements, a first shaft connected with the fifth rotational element and the input shaft, a second shaft connected with the ninth and tenth elements, and selectively connected with the input shaft, a third shaft connected with the eleventh element and the output shaft, a fourth shaft connected with the second and twelfth elements, a fifth shaft connected with the sixth elements, a sixth shaft connected with the seventh element, a seventh shaft connected with the eighth element, and a plurality of shafts each selectively connecting a corresponding element to a transmission housing, the corresponding element being an element of the first and second planetary gear sets that is not interconnected.

Abstract: A planetary gear train of a transmission for vehicles is provided. The planetary gear train includes an input shaft that receives power of an engine, an output shaft that outputs power, and four planetary gear sets each including three rotary elements. Additionally, multiple shafts are selectively and directly connected to the rotary elements to thus achieve a shift-stage of at least ten forward speeds or more.

Abstract: The present disclosure provides a planetary gear train of an automatic transmission for a vehicle. The planetary gear train may include: an input shaft receiving torque of an engine; an output shaft outputting changed torque; a first planetary gear set including first, second, and third rotation elements; a second planetary gear set including fourth, fifth, and sixth rotation elements; a third planetary gear set including seventh, eighth, and ninth rotation elements; a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements. The planetary gear train improves power delivery performance and fuel economy by achieving at least eleven forward speed stages and widening speed ratio (or gear ratio) with a reduced number of constituent elements being used, and secures linearity of step ratios.

Abstract: A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving torque of an engine, an output shaft outputting changed torque of the engine, a first planetary gear set including first, second, and third rotational elements, a second planetary gear set including fourth, fifth, and sixth rotational elements, a third planetary gear set including seventh, eighth, and ninth rotational elements, a first rotation shaft, a second rotation shaft directly connected to the input shaft, a third rotation shaft, a fourth rotation shaft selectively connected to a transmission housing, a fifth rotation shaft directly connected to the output shaft, a sixth rotation shaft directly connected to the input shaft, a seventh rotation selectively connected to the first rotation shaft and the third rotation shaft, and an eighth rotation shaft selectively connected to the fourth rotation shaft and the fifth rotation shaft.

Abstract: Nine or more forward speeds and at least one reverse speed is achieved by a planetary gear train of an automatic transmission for a vehicle including an input shaft, an output shaft, four planetary gear sets respectively having three rotation elements, and six control elements for selectively interconnecting the rotation elements.

Abstract: A planetary gear train of a transmission for a vehicle is provided. Nine or more forward speeds and one or more reverse speeds are achieved by a planetary gear train of an automatic transmission for a vehicle including an input shaft and an output shaft. A first planetary gear set has first, second, and third rotation elements. A second planetary gear set has fourth, fifth, and sixth rotation elements. A third planetary gear set has seventh, eighth, and ninth rotation elements. A fourth planetary gear set has tenth, eleventh, and twelfth rotation elements and eight shaft element.

Abstract: A planetary gear train of an automatic transmission for a vehicle is disclosed. The planetary gear train may include: an input shaft configured for receiving torque of an engine, an output shaft configured for outputting changed torque, a first planetary gear set including a first rotation element, a second rotation element, and a third rotation element, a second planetary gear set including a fourth rotation element, a fifth rotation element, and a sixth rotation element, a third planetary gear set including a seventh rotation element, an eighth rotation element, and a ninth rotation element.

Abstract: A power transmission apparatus for a vehicle may include a first input shaft directly connected to an engine, a second input shaft selectively receiving torque of the engine through a first clutch, a third input shaft selectively receiving the torque of the engine through a second clutch, an intermediate shaft disposed in parallel with the first, second, and third input shafts, a transfer gear fixedly disposed on the intermediate shaft, an first shifting member outputting first and second preliminarily shifted torques, an second shifting member outputting third and fourth preliminarily shifted torques, a third shifting member outputting eight forward speed stage stages and one reverse speed stage, and an auxiliary power source disposed on a supply of the torque transmitted from the first shifting member and the second shifting member to the third shifting member and supplying torque to the third shifting member.

Abstract: A power transmission apparatus for a vehicle may include a first input shaft, a second input shaft, a third input shaft, an intermediate shaft disposed parallel to the first, second, and third input shafts, a transfer gear fixedly disposed on the intermediate shaft and outputting torque thereof, an first shifting member changing torque of an engine into first and second preliminarily shifted torques, and outputting the first and second preliminarily shifted torques, an second shifting member changing the torque of the engine into third and fourth preliminarily shifted torques, and outputting the third and fourth preliminarily shifted torques, and a third shifting member changing the torque of the engine transmitted from the first input shaft and the first preliminarily shifted torque to the fourth preliminarily shifted torque selectively transmitted from the first shifting member or the second shifting member into eight forward speed stages and one reverse speed stage.