Power transmission system of electric vehicle
阅读说明:本技术 电动车辆的动力传动系统 (Power transmission system of electric vehicle ) 是由 段诚武 姚健 于 2018-08-31 设计创作,主要内容包括:一种车辆的动力传动系统包括壳体、电动发电机单元、变矩器、第一轴和第二轴、第一齿轮组和第二齿轮组以及扭矩传递机构。电动发电机单元包括输出构件。变矩器包括泵和涡轮。泵与电动发电机单元的输出构件连接以便共同旋转。第一轴由动力传动系统壳体可旋转地支撑,并且与变矩器的涡轮连接以便共同旋转。第二轴由动力传动系统壳体可旋转地支撑,并且平行于第一轴设置。输出齿轮连接到第二轴以便共同旋转。(A powertrain system of a vehicle includes a housing, a motor generator unit, a torque converter, first and second shafts, first and second gear sets, and a torque transmitting mechanism. The motor generator unit includes an output member. The torque converter includes a pump and a turbine. The pump is connected for common rotation with an output member of the motor generator unit. The first shaft is rotatably supported by the driveline housing and is connected for common rotation with a turbine of the torque converter. The second shaft is rotatably supported by the driveline housing and is disposed parallel to the first shaft. The output gear is connected for common rotation to the second shaft.)
1. A vehicle driveline, the driveline comprising:
a drivetrain housing;
a motor generator unit including an output member;
a torque converter including a pump and a turbine, and wherein the pump is connected for common rotation with an output member of the motor generator unit;
a first shaft rotatably supported by the driveline housing, and wherein the first shaft is connected for common rotation with a turbine of the torque converter;
a second shaft rotatably supported by the driveline housing and disposed parallel to the first shaft, and wherein an output gear is connected to the second shaft for common rotation;
a first gear set including a first gear and a second gear, and wherein the first gear is rotatably supported by the first shaft and the second gear is connected for common rotation with the second shaft;
a second gear set including a third gear and a fourth gear, and wherein the third gear is rotatably supported by the first shaft and the fourth gear is connected for common rotation with the second shaft, an
A torque-transmitting mechanism that selectively transmits torque from the first shaft to the second shaft; and is
Wherein the powertrain is selectively actuated to provide one of a first forward drive gear ratio and a reverse drive gear ratio.
2. The drivetrain of claim 1, wherein the torque-transmitting mechanism selectively connects a first gear of the first gear set to the first shaft for common rotation.
3. The drivetrain of claim 1, wherein the torque-transmitting mechanism selectively connects a third gear of the second gear set to the first shaft for common rotation.
4. The drivetrain of claim 2, further comprising a transfer member disposed about the first and second gears of the first gear set to transfer torque from the first gear to the second gear.
5. The drivetrain of claim 4, wherein the conveyance member is one of a chain and a belt.
6. The drivetrain of claim 1, wherein the torque-transmitting mechanism is one of a synchronizer, a dog clutch, and a friction clutch.
7. The drivetrain of claim 1, wherein the first gear set further comprises a planetary gear set including a sun gear, a ring gear, a plurality of planet gears that mesh with the sun gear and the ring gear, respectively, and a planet carrier member that rotatably supports the planet gears, and wherein the sun gear is connected for common rotation with a pump of the torque converter and the planet carrier member is connected for common rotation with the first gear of the first gear set.
8. The drivetrain of claim 7, wherein the torque-transmitting mechanism selectively connects the ring gear of the planetary gear set to the housing.
9. The drivetrain of claim 8, wherein a third gear of the second gear set is coplanar with a fourth gear of the second gear set, and the third gear is connected for common rotation with the first shaft.
10. The drivetrain of claim 9, wherein the torque transmitting mechanism is a dog clutch.
Technical Field
The present disclosure relates generally to a powertrain system of a vehicle, and more particularly to a transmission of a vehicle having a motor generator unit as a primary torque source.
Background
Modern Electric Vehicles (EVs) are becoming increasingly popular due to advances in many vehicle performance attributes. However, a major obstacle to the increasing popularity of EVs includes the distance that an EV can travel after being charged once. While there are many characteristics that help increase the range of an EV, improving certain characteristics may adversely affect the performance of an EV in other areas. Sometimes tradeoffs are made to meet customer expectations. For example, when a driver operates a treadmill with a powerful engine, they understand that the engine may make a loud sound when traveling at the highest speed. Furthermore, if the driver wants to make a quick pass through a turn, they may accept that potholes and bumps in the road may be perceived more than a cruising vehicle that is comfortable to drive.
Therefore, when the mileage of the extended EV is prioritized, other attributes are also affected. For example, sizing a Motor Generator Unit (MGU) may provide an opportunity to travel the same distance using less battery power. However, other attributes, such as drivability, startability, and mobility, may not meet the customer's expectations.
Accordingly, there is a need in the art for an improved EV having superior performance while exceeding current range capacity and increasing affordability by reducing costs.
Disclosure of Invention
The present disclosure includes a vehicle powertrain. The transmission system includes a housing, a motor generator unit, a torque converter, first and second shafts, first and second gear sets, and a torque transmitting mechanism. The motor generator unit includes an output member. The torque converter includes a pump and a turbine. The pump is connected for common rotation with an output member of the motor generator unit. The first shaft is rotatably supported by the driveline housing and is connected for common rotation with a turbine of the torque converter. The second shaft is rotatably supported by the driveline housing and is disposed parallel to the first shaft. The output gear is connected for common rotation to the second shaft.
The first gear set includes a first gear rotatably supported by the first shaft and a second gear connected for common rotation with the second shaft. The second gear set has a third gear rotatably supported by the first shaft and a fourth gear connected for common rotation with the second shaft. The torque-transmitting mechanism selectively transmits torque from the first shaft to the second shaft. The powertrain is selectively actuated to provide one of a first forward drive gear ratio and a reverse drive gear ratio.
In one example of the present disclosure, a torque-transmitting mechanism selectively connects a first gear of a first gear set to a first shaft for common rotation.
In another example of the present disclosure, a torque-transmitting mechanism selectively connects the third gear of the second gear set to the first shaft for common rotation.
In another example of the present disclosure, a transfer member is disposed about the first and second gears of the first gear set for transferring torque from the first gear to the second gear.
In another example of the present disclosure, the conveying member is one of a chain and a belt.
In another example of the present disclosure, the torque transmitting mechanism is one of a synchronizer and a dog clutch.
In another example of the present disclosure, the first gear set further includes a planetary gear set including a sun gear, a ring gear, and a plurality of planet gears meshing with the sun gear and the ring gear, respectively. The planet gear carrier member rotatably supports the planet gears. The sun gear is connected for common rotation with the pump of the torque converter, and the planet carrier member is connected for common rotation with the first gear of the first gear set.
In another example of the present disclosure, a torque-transmitting mechanism selectively connects the ring gear of the planetary gear set to the housing.
In another example of the present disclosure, the third gear of the second gear set is coplanar with the fourth gear of the second gear set, the third gear being connected for common rotation with the first shaft.
In another example of the present disclosure, the torque transmitting mechanism is a dog clutch.
In another example of the present disclosure, the powertrain is selectively actuated to provide an initial forward launch mode, a second forward launch mode, and a reverse launch mode. The initial forward start mode includes engaging the dog clutch when the motor generator unit is operating in a forward rotational direction. The second forward launch mode includes disengaging the dog clutch when the motor generator unit is operating in the forward rotational direction. The reverse launch mode includes engaging the dog clutch when the motor generator unit is operating in a reverse rotational direction.
The above features and advantages and other features and advantages of the present disclosure will become apparent from the following detailed description when taken in conjunction with the accompanying drawings.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.
FIG. 1 is a schematic illustration of a powertrain system of an electric vehicle according to the principles of the present disclosure;
FIG. 2 is a schematic diagram of a powertrain system of an electric vehicle according to the principles of the present disclosure;
FIGS. 3A and 3B are graphs comparing motor torque to motor speed and resulting vehicle performance in accordance with the principles of the present disclosure;
FIG. 4 is a vehicle speed profile of various examples of a powertrain system according to the principles of the present disclosure; and
FIG. 5 is a graphical representation of torque measurements at various components of a powertrain system according to the principles of the present disclosure.
Detailed Description
Referring to the drawings, wherein like reference numbers refer to like components, in fig. 1 and 2, an example of a vehicle powertrain is shown and will now be described. The powertrain in fig. 1 is designated by
The
The first and second co-planar gear sets 22, 24 each include two gears. The first gear 36 of the first
The
The
The
In the third or reverse position, the
Turning now to fig. 2, another example of the present disclosure is shown and will now be described. The powertrain in FIG. 2, which includes
The
The co-planar gear set 122 includes a
The planetary gear set 124 includes a
The
Operation of the
The second or secondary forward launch mode includes disengaging the torque-transmitting
The third or reverse launch mode includes launching the vehicle in reverse at a lower gear ratio. With the torque-transmitting
Turning now to fig. 3A, 3B, 4 and 5, graphs depicting the performance of a vehicle having the
The
The graph 270 shown in fig. 5 depicts the torque output of the powertrain in three configurations. The y-axis 272 is torque and the x-axis 274 is time in seconds from start-up. The second data series 276 is generated by the torque of the
While examples have been described in detail, those familiar with the art to which this disclosure relates will recognize various alternative designs and examples for practicing the disclosed methods within the scope of the appended claims.
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