JP2008062679A - Automotive drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automotive drive device enhancing applicability to an engine lateral placement type automobile by shortening axial length of the drive device provided with at least two sets of planetary gears and two motors. <P>SOLUTION: The automotive drive device is provided with a pair of planetary gears and a pair of planetary gears separately arranged on a first output shaft and a second output shaft provided in parallel to an input shaft respectively and a first motor and a second motor. The input shaft is connected to a first ring gear through the pair of first gears and is connected to a second carrier through the pair of second gears. The first output shaft is connected to a first carrier and the second output shaft is connected to a second ring gear respectively. The first motor is connected to a first sun gear, and the second motor can be connected to a second sun gear and can be connected to the first output shaft. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drive device for a so-called hybrid vehicle having two types of power sources, that is, an internal combustion engine and an electric motor, and in particular, a plurality of planetary gear sets to which a plurality of motors can connect or connect a driving force input from the engine. It is related with the drive device for motor vehicles which enabled transmission to an output shaft via.

  2. Description of the Related Art Conventionally, two sets proposed by the present applicant have been proposed as an automobile drive device capable of transmitting a driving force input from an engine to an output shaft via a plurality of planetary gears that can be connected or connected by a plurality of motors. There is one using a planetary gear and two motors (see Patent Document 1).

However, the above-described conventional vehicle drive device has a problem that it is difficult to mount the vehicle on a vehicle when the drive device is mounted on a so-called engine-mounted front-wheel drive vehicle or the like because the axial length of the drive device is long.
Japanese Patent Application Laid-Open No. 11-334397

The problem to be solved is that since the axial length of the drive device is long, there is a restriction in terms of required space when applied to an engine horizontal type automobile.
SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle drive device that can reduce the axial length of a drive device including at least two sets of planetary gear sets and two motors, thereby improving the applicability to a horizontally mounted engine vehicle. Is to provide.

  The vehicle drive device of the present invention includes a first output shaft and a second output shaft provided in parallel with an input shaft, a first drive gear integral with the first output shaft, and a second drive integral with the second output shaft. A gear, an output gear meshing with the first drive gear and the second drive gear, a first pinion disposed coaxially with the first output shaft and meshed with the first sun gear, the first ring gear, the first ring gear, and the first sun gear, A first planetary gear set having a first carrier for pivotally supporting the first pinion and converting the rotational speed of the input shaft to the rotational speed of the first drive gear; and coaxially arranged with the second output shaft. A second sun gear, a second ring gear, a second ring gear, a second pinion meshing with the second sun gear, and a second carrier that rotatably supports the second pinion, and a second drive for the rotational speed of the input shaft A second planetary gear set for converting the number of rotations of the gear; A first motor and a second motor, the input shaft being connected to the first ring gear via the first gear pair and the second carrier via the second gear pair, respectively, and the first output shaft being the first output shaft; The first carrier and the second output shaft are connected to the second ring gear, the first motor is connected to or connectable to the first sun gear, and the second motor is connectable to the second sun gear. The first output shaft or the second output shaft can be connected.

  In the automobile drive device of the present invention, the first planetary gear set and the second planetary gear set are arranged by dividing them into a first output shaft and a second output shaft arranged in parallel, and the two clutches are also first. Since the output shaft and the second output shaft are arranged separately, the axial length can be shortened. Therefore, when mounted on a front-wheel drive vehicle or the like that is installed horizontally on the engine, it can be applied to an automobile with a small vehicle width or combined with an engine with a longer axial length.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an automobile drive device according to an embodiment of the present invention will be described with reference to the drawings based on each example.

FIG. 1 is a skeleton diagram of the automobile drive device of the first embodiment.
FIG. 2 shows the positional relationship of each axis when viewed from the left side of FIG.
In the vehicle driving apparatus of the first embodiment shown in FIG. 1, a first output shaft 12 and a second output shaft 14 are arranged in parallel with an input shaft 10 driven from the engine 1.

A first drive gear 12a and a second drive gear 14a are integrated with the first output shaft 12 and the second output shaft 14, respectively. The first drive gear 12a and the second drive gear 14a are both integrated with the output gear 16. I'm engaged. Since FIG. 1 is drawn in a state of being expanded along AA in FIG. 2, the second drive gear 14a and the output gear 16 are drawn apart from each other in FIG. The two drive gear 14a and the output gear 16 are meshed with each other.
In FIG. 2, each circle represents the outer diameter of each gear and the like, and the axis center is represented by a black dot and indicated by an arrow.

Therefore, the first output shaft 12 and the second output shaft 14 are connected to each other via the first drive gear 12a, the output gear 16, and the second drive gear 14a, respectively.
The output gear 16 drives the axles 20a and 20b via the differential device 18, and the axles 20a and 20b are connected to left and right wheels (not shown).

A first planetary gear set 22 is coaxially arranged on the first output shaft 12, and a second planetary gear set 24 is coaxially arranged on the second output shaft 14.
The first input drive gear 10a that is integral with the input shaft 10 meshes with the first input gear 26 that is coaxially rotatable with the first output shaft 12 to form a first gear pair.
Similarly, the second input drive gear 10b integrated with the input shaft 10 meshes with the second input gear 28 that is coaxially rotatable with the second output shaft 14 to form a second gear pair.
The first gear pair and the second gear pair are arranged between the first planetary gear set 22, the second planetary gear set 24 and the first output shaft 12, the second output shaft 14, and the output gear 16 in the axial direction of the driving device. Be placed.

Both the first planetary gear set 22 and the second planetary gear set 24 are generally called single pinion types, and each has the same configuration.
That is, the first planetary gear set 22 is configured to freely rotate the first sun gear 30, the first ring gear 32, the plurality of first pinions 34 meshed with the first ring gear 32 and the first sun gear 30, and the first pinion 34. The first carrier 38 is pivotally supported.
Similarly, the second planetary gear set 24 includes a second sun gear 40, a second ring gear 42, a plurality of second pinions 44, and a second carrier 48.

  A first motor 50 and a second motor 52 are disposed at the left end of FIG. 1. The first motor 50 is connected to the first sun gear 30, and the second motor 52 is connected to the third input gear 54. Yes. The third input gear 54 meshes with a third input gear 56 coaxial with the first output shaft 12 to form a third gear pair, and meshes with a fourth input gear 58 coaxial with the second output shaft 14. A fourth gear pair is configured.

The first input gear 26, the second input gear 28, the first output shaft 12 and the second output shaft 14, the rotating members of the first planetary gear set 22 and the second planetary gear set 24, the first motor 50, the first The two motors 52 are connected as follows or can be connected.
The first sun gear 30 is connected to the first motor 50, and the first ring gear 32 is connected to the input shaft 10 via the first gear pair 10 a, 26.

The first carrier 38 is connected to the first output shaft 12 and can be connected to the second motor 52 via the first clutch 60 and the third gear pairs 56 and 54.
Accordingly, the first output shaft 12 is connected to the second motor 52 by the connection of the first clutch 60.

The second sun gear 40 can be connected to the second motor 52 via the second clutch 62 and the fourth gear pair 58, 54.
The second ring gear 42 is connected to the second output shaft 14, and the second carrier 48 is connected to the input shaft 10 via the second gear pair 28, 10 a.
In FIG. 1, the first clutch 60 and the second clutch 62 are drawn like conical clutches. However, the present invention is not limited to this, and any type may be used as long as it has a connection / disconnection function.

Next, the operation of the first embodiment shown in FIG. 1 will be described.
Each of the first and second motors 50 and 52 has a function as a motor and a function as a generator.
First, start and acceleration by electric power supplied from a battery and a controller (not shown) with the engine 1 stopped will be described.
In this case, the first clutch 60 is connected, and the second motor 52 decelerates and drives the first output shaft 12 via the third gear pair 54 and 56 to start and accelerate.

  When the engine 1 is started during the acceleration, the first motor 50 is further energized to drive the engine. At this time, since the torque in the direction opposite to the acceleration by the second motor 52 described above acts on the first carrier 38, the feeling of acceleration is prevented from being impaired by increasing the torque of the second motor 52 by that amount. desirable.

As soon as the engine 1 is started, the first motor 50 generates power. As a result, torque acts on the first carrier 38 in an accelerating direction, so that the automobile is driven not only by the second motor 52 but also by the torque of the engine 1.
At this time, the electric power generated by the first motor 50 can be supplied to the second motor 52 via the controller, or the battery can be charged.

As the speed of the automobile increases, the rotational speed of the first motor 50 eventually becomes zero. At this time, the gear ratios of all gears are set so that the rotational speeds of the fourth input gear 58 and the second sun gear 40 are substantially the same.
Then, the second clutch 62 is connected when the rotational speed of the first motor 50 becomes zero. Since the rotational speeds of the fourth input gear 58 and the second sun gear 40 are substantially the same, when the second clutch 62 is connected, heat generation and wear due to so-called shift shock and friction hardly occur.

At this time, if the first clutch 60 and the second clutch 62 are both connected, the vehicle is mechanically driven by the engine 1 via the first planetary gear set 22 and the second planetary gear set 24. In this state, the driving force of the first motor 50 and the second motor 52 can be added to the driving force of the engine 1.
This is the driving in the low speed mode.

Next, when the first clutch 60 is released, it switches to traveling in the high speed mode. That is, the output torque of the engine 1 drives the second carrier 48 from the input shaft 10 through the second gear pair 10a, 28, and is divided by the second planetary gear set 24 to be distributed to the second ring gear 42. While the vehicle is driven in the forward direction with the generated torque, the torque distributed to the second sun gear 40 drives the second motor 52 to generate electricity.
This electric power is supplied to the first motor 50 via the controller, and the first motor 50 drives the first output shaft 12 in the forward direction via the first planetary gear set 22.

At this time, a reaction torque acts on the first ring gear 32. Since this torque is in the direction opposite to the rotation direction of the engine 1, the torque for driving the second carrier 48 from the engine 1 is reduced.
Therefore, the engine 1 causes the second motor 52 to generate power via the second planetary gear set 24, and the electric power is used by the first motor 50 to drive the first output shaft 12 via the first planetary gear set 22. The power transmission is small with respect to the output of the engine 1.
In other words, the engine 1 has a high ratio of mechanically driving the first and second output shafts 12 and 14 via the first and second planetary gear sets 22 and 24.

  Eventually, the rotational speeds of the second sun gear 40 and the second motor 52 become zero. At this time, since the power generation of the second motor 52 is also eliminated, all the output of the engine 1 drives the second output shaft 14 via the second planetary gear set 24 unless power is supplied to the first motor 50 from the battery. Thus, the mechanical power transmission ratio becomes 100%.

  In the above description, the case of accelerating the automobile has been described. Conversely, when the vehicle decelerates, the first and second motors 50 and 52 generate electric power, thereby charging the battery and driving with this electric power during the next acceleration. Thus, the fuel efficiency of the automobile can be improved.

Next, reverse gear will be described.
When the engine 1 moves backward in a stopped state, the first clutch 60 can be connected and the second motor 52 can move backward. At this time, the second motor 52 rotates in the opposite direction to that during forward movement.
When the engine 1 is started during reverse travel using only the second motor 52, the first motor 50 rotates the engine 1 via the first planetary gear set 22.

  The travel after the engine 1 is started is performed while generating power with the first motor 50 as in the above-described forward movement. At this time, in the first planetary gear set 22, the torque in the direction in which the vehicle moves forward acts on the first output shaft 12, so the drive torque in the reverse direction exerted by the second motor 52 is reduced, so The reverse drive torque is smaller than the hour.

Although a detailed description is omitted, the first motor 50 generates electric power through the first planetary gear set 22 in the low speed mode as compared with a drive device having only one planetary gear set. Since a large torque acts on one output shaft 12, a large driving torque is obtained in combination with a deceleration driving torque by the second motor 52. In the high speed mode, the power transmission efficiency is increased by the amount of mechanical power transmission. Can be high.
In addition, since the two planetary gear sets 22 and 24 and the two clutches 60 and 62 are arranged separately on the two first and second output shafts 12 and 14, a plurality of conventional planetary gear sets are used. The axial length can be shortened compared to the drive device.

FIG. 3 is a skeleton diagram showing the automobile drive device of the second embodiment.
Here, the description will focus on parts that are different from the first embodiment, the same reference numerals are assigned to parts that are substantially the same as those of the first embodiment, and descriptions thereof are omitted.

FIG. 3 is a skeleton diagram corresponding to FIG. 1, and the area around the first planetary gear set 22 is different from that of the first embodiment.
That is, the first ring gear 32 is not directly connected to the first input gear 26 but is connected via the third clutch 64, and can be fixed to the case (stationary portion) 68 by the fourth clutch 66. . Since other configurations are the same as those of the first embodiment, their description is omitted.

Next, the operation of the second embodiment will be described. Also here, description of the substantially same parts as those of the first embodiment is omitted.
In forward movement, the third clutch 64 is always connected, so that the same operation as in the first embodiment is possible, and the description thereof is omitted.

The reverse movement is performed by releasing the connection of the third clutch 64 and connecting the fourth clutch 66.
As a result, the first ring gear 32 is fixed to the case 68, so that the first motor 50 can be driven in the reverse direction. At this time, when the engine 1 is in a stopped state, it can be driven only by the first motor 50, and can be energized by the second motor 52 after the first clutch 60 is connected.

  When starting the engine 1 during reverse travel, the first clutch 60 is disconnected, the second clutch 62 is connected, and the engine 1 is rotated by the second motor 52 via the second planetary gear set 24. .

  After the engine 1 is started, power is generated by the second motor 52 with the second clutch 62 connected, and this electric power is supplied to the first motor 50 via a controller (not shown) to perform reverse drive. Also in this case, since the forward torque acts on the second output shaft 14 in the second planetary gear set 24 as the second motor 52 generates power, the reverse drive torque by the first motor 50 is reduced. Since the output torque of the first motor 50 is driven at a reduced speed by the first planetary gear set 22, a sufficiently large reverse torque can be obtained.

Also in the second embodiment, the first motor 50 generates power via the first planetary gear set 22 in the low speed mode as compared with a drive device having only one planetary gear set in forward travel. Accordingly, a large torque acts on the first output shaft 12, so that a large driving torque is obtained in combination with the deceleration driving torque by the second motor 52. In the high speed mode, the power is increased by the amount of mechanical power transmission. Transmission efficiency can be increased.
In addition, since the two planetary gear sets 22 and 24 and the two clutches 60 and 62 are arranged separately on the two first and second output shafts 12 and 14, a plurality of conventional planetary gear sets are used. The axial length can be shortened compared to the drive device.

As described above, the automobile drive device of the present invention can obtain a large driving torque especially in the forward low speed mode, and can obtain high power transmission in the high speed mode, and uses a plurality of conventional planetary gear sets. The axial length can be shortened compared to the drive device.
In the above-described embodiment, the second motor 52 enables the first output shaft 12 to be driven at a reduced speed. However, the second motor 52 may be configured to drive the second output shaft 14.
The present invention can be implemented with improvements such as providing a damper between the engine and the input shaft based on general knowledge of those skilled in the art.

  A large driving torque is obtained in the forward low speed mode, high power transmission is obtained in the high speed mode, and the axial length can be shortened compared to a conventional driving device using a plurality of planetary gear sets. In particular, when applied to a transmission mounted on a horizontally mounted engine vehicle, it can be applied to a vehicle having a smaller vehicle width, and can also be applied in combination with an engine having a larger axial length. It can be widely applied to passenger cars.

It is a skeleton figure of the drive device for vehicles of the present invention. Example 1 It is a figure which shows arrangement | positioning of the axis | shaft of Example 1. FIG. It is a skeleton figure of Example 2 of the present invention. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 10 Input shaft 12 1st output shaft 14 2nd output shaft 16 Output gear 18 Differential gear 20 Axle 22 1st planetary gear set 24 2nd planetary gear set 26 1st input gear 28 2nd input gear 30 1st sun gear 32 1st ring gear 34 1st pinion 38 1st carrier 40 2nd sun gear 42 2nd ring gear 44 2nd pinion 48 2nd carrier 50 1st motor 52 2nd motor 54 3rd input gear 56 4th input gear 58 5th input Gear 60 First clutch 62 Second clutch 64 Third clutch 66 Fourth clutch 68 Case

Claims (2)

An input shaft;
A first output shaft provided parallel to the input shaft;
A second output shaft provided parallel to the input shaft and the first output shaft;
A first drive gear integral with the first output shaft;
A second drive gear integral with the second output shaft;
An output gear meshing with the first drive gear and the second drive gear;
A first pinion that is disposed coaxially with the first output shaft and that is engaged with the first sun gear, the first ring gear, the first ring gear, and the first sun gear, and a first carrier that rotatably supports the first pinion. A first planetary gear set for converting the rotational speed of the input shaft into the rotational speed of the first drive gear;
The second sun gear, the second ring gear, the second ring gear, the second pinion meshed with the second sun gear, and the second carrier that rotatably supports the second pinion are arranged coaxially with the second output shaft. A second planetary gear set for converting the rotational speed of the input shaft into the rotational speed of the second drive gear;
A first motor;
A second motor,
The input shaft is connected to the first ring gear via a first gear pair and the second carrier via a second gear pair, respectively.
The first output shaft is connected to the first carrier, and the second output shaft is connected to the second ring gear.
The first motor is connected to or connectable to the first sun gear;
The second motor is connectable to the second sun gear and is connectable to the first output shaft or the second output shaft. The second motor can be connected to the first output shaft via a third gear pair and can be connected to the second sun gear via a fourth gear pair. The drive device for motor vehicles described.

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