JP2018003871A - Transmission for hybrid vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission for a hybrid vehicle which can enlarge a common portion of a transmission case in addition to a constituent element in the transmission between an engine vehicle and the hybrid vehicle.SOLUTION: This transmission for a hybrid vehicle comprises: an input shaft connected to an engine; an output shaft connected to drive wheels; a plurality of drive gears arranged at the input shaft; a plurality of driven gears arranged at the output shaft, and engaged with a plurality of the drive gears; a transmission case 1 for accommodating the other gear row other than a specified gear row with which the drive gears of a motor 40 are engaged out of a plurality of gear rows in which the drive gears and the driven gears are engaged with each other; bearings 11, 12 for rotatably supporting the input shaft and the output shaft to the transmission case between the specified gear row and the other gear row; and a side cover 5 which is attached to the transmission case, and accommodates the specified gear row.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmission used in a hybrid vehicle including an engine and a motor.

  Conventionally, Patent Document 1 discloses a configuration in which a gear constituting a specific shift stage among a plurality of shift gear trains is also used as a motor-side driven gear. As a result, a hybrid vehicle transmission can be configured simply by adding a motor and a motor-side drive gear to a transmission used for an engine vehicle, thereby reducing costs.

JP2015-140237A

  However, although components such as gears in the transmission can be shared, the sharing of the transmission case is not considered, and it is necessary to manufacture completely different transmission cases for the engine vehicle and the hybrid vehicle. There is a problem that the cost associated with the transmission case increases.

  The present invention has been made paying attention to the above-mentioned problems, and in addition to the components in the transmission, the transmission for a hybrid vehicle capable of expanding the common part of the transmission case between the engine vehicle and the hybrid vehicle. The purpose is to provide.

  In order to achieve the above object, in the hybrid vehicle transmission of the present invention, an input shaft coupled to the engine, an output shaft coupled to the drive wheels, a plurality of drive gears provided on the input shaft, Of the plurality of driven gears that are provided on the output shaft and mesh with the plurality of drive gears, and among the plurality of gear trains that mesh with the drive gear and the driven gear, other than the specific gear train that meshes with the drive gear of the motor A transmission case that houses another gear train; a bearing that rotatably supports the input shaft and the output shaft on the transmission case between the specific gear train and the other gear train; A side cover that is attached to the machine case and houses the specific gear train.

  Therefore, in addition to the components in the transmission, the transmission case can be shared between the engine vehicle and the hybrid vehicle, and the manufacturing cost can be suppressed.

1 is a schematic cross-sectional view of a hybrid vehicle transmission according to a first embodiment. It is a schematic sectional drawing showing the shared part of the transmission for hybrid vehicles and the transmission for engine vehicles of Example 1. FIG. It is a schematic sectional drawing at the time of applying to an engine vehicle using the sharing part of the transmission for hybrid vehicles of Example 1. FIG.

[Example 1]
1 is a schematic cross-sectional view of a hybrid vehicle transmission according to a first embodiment. The hybrid vehicle transmission TM is a parallel twin-shaft always-mesh transmission having an input shaft Input connected to an engine (not shown) and an output shaft Output connected to drive wheels (not shown). The input shaft Input includes, in order from the engine side, a first speed drive gear G1in constituting a first speed gear train, a reverse speed drive gear GR constituting a reverse speed gear train, and a second speed drive gear G2in constituting a second speed gear train. And a third speed drive gear G3in constituting a third speed gear train, a fourth speed drive gear G4in constituting a fourth speed gear train, and a fifth speed drive gear G5in constituting a fifth speed gear train.

  The third speed drive gear G3in, the fourth speed drive gear G4in, and the fifth speed drive gear G5in are supported so as to be rotatable relative to the input shaft Input. Between the 3rd speed drive gear G3in and the 4th speed drive gear G4in, an idle movement that allows relative rotation between the 3rd speed drive gear G3in and the input shaft Input and between the 4th speed drive gear G4in and the input shaft Input. A second synchro mechanism S2 capable of switching between a state and a fixed state in which relative rotation is prohibited and rotates integrally; A position adjacent to the 5-speed drive gear G5in can be switched between an idle state that allows relative rotation between the 5-speed drive gear G5in and the input shaft Input and a fixed state that prohibits relative rotation and rotates integrally. A third synchronization mechanism S3 is provided.

  The output shaft Output includes, in order from the engine side, a first-speed driven gear G1out that forms a first-speed gear train, a reverse-speed drive gear GRout that forms a reverse-speed gear train, and a second-speed driven gear G2out that forms a second-speed gear train. And a third speed driven gear G3out constituting a third speed gear train, a fourth speed driven gear G4out constituting a fourth speed gear train, and a fifth speed driven gear G5out constituting a fifth speed gear train.

  The first speed driven gear G1out, the second speed driven gear G2out, and the fifth speed driven gear G5out are supported so as to be rotatable relative to the output shaft Output. Between the 1st-speed driven gear G1out and the 2nd-speed driven gear G2out, free-running that allows relative rotation between the 1st-speed driven gear G1out and the output shaft Output, and between the 2nd-speed driven gear G2out and the output shaft Output. A first sync mechanism S1 capable of switching between a state and a fixed state in which relative rotation is prohibited and rotates integrally; A position adjacent to the 5-speed driven gear G5out can be switched between an idle state that allows relative rotation between the 5-speed driven gear G5out and the output shaft Output, and a fixed state that prohibits relative rotation and rotates integrally. A fourth synchronization mechanism S4 is provided.

  Hereinafter, a pair of meshed drive gear and driven gear is referred to as a gear train, and for example, a combination of the first speed drive gear G1in and the first speed driven gear G1out is referred to as a first gear train. A motor drive gear Min provided on the motor shaft Ms of the motor 40 is connected to the fifth speed gear train. In the case of the first embodiment, the motor drive gear Min always meshes with the fifth speed drive gear G5in.

  A plurality of gear trains from the first gear train to the fourth gear train are accommodated in the transmission case 1. In other words, the fifth gear train is provided so as to be exposed to the outside of the transmission case 1. A bearing 11 that rotatably supports the input shaft Input and a bearing 12 that rotatably supports the output shaft Output are provided on the wall portion of the transmission case 1 on the fifth-speed gear train side. The motor 40 is housed in the motor case 4 and attached to the fifth speed gear train side of the transmission case 1. The motor case 4 is provided with bearings 41 and 42 that rotatably support the motor shaft Ms. The fifth speed gear train with which the motor driving gear Min is engaged is housed in the side cover 5 and attached to the fifth speed gear train side of the motor case 4. An engine side of the transmission case 1 is open, and a housing 2 that closes the opening is attached. The housing 2 is provided with a bearing 21 that rotatably supports the input shaft Input and a bearing 22 that rotatably supports the output shaft Output. For the sake of explanation, a gap is provided between the transmission case 1, the housing 2, the motor case 4, and the side cover 5 in FIG. Fixed.

  During first speed travel, the first sync mechanism S1 fixes the first speed driven gear G1out and the output shaft Output, and the second sync mechanism S2 is set to the neutral position. At this time, when the torque of the motor 40 is transmitted to the output shaft Output, it has a low rotation mode using the third synchronization mechanism S3 and a high rotation mode using the fourth synchronization mechanism S4. In the case of the low rotation mode, the third sync mechanism S3 fixes the fifth speed drive gear G5in and the input shaft Input, the fourth sync mechanism S4 is set to the neutral position, and the fifth speed drive gear G5in is changed from the motor drive gear Min. Torque is applied to the input shaft Input. On the other hand, in the high rotation mode, the fifth synchronization gear G5out and the output shaft Output are fixed by the fourth synchronization mechanism S4, and the third synchronization mechanism S3 is set to the neutral position. Thereby, the torque of the motor 40 is transmitted from the motor driving gear Min to the fifth speed driven gear G5out via the fifth speed driving gear G5in, and the torque is applied to the output shaft Output. Even in other gear stages, hybrid running using motor torque is realized by the same control.

  Here, the configuration of the cases of the transmission TM of the first embodiment will be described. In recent years, there has been a growing need for hybrid vehicles, and it is desired to add a motor to an engine vehicle having only an engine as a power source to form a hybrid vehicle. In the case of a parallel two-shaft constant mesh transmission, a hybrid vehicle has been proposed in which a gear of a motor is meshed with one of the gear trains. In this case, the components in the transmission such as the gear train can be shared. However, when the motor is added, if the shape of the transmission case is completely different between the engine vehicle and the hybrid vehicle, there is a problem that the manufacturing cost increases. Therefore, in the first embodiment, the transmission case 1 is also configured so that it can be shared as much as possible.

  FIG. 2 is a schematic diagram showing a shared portion of the hybrid vehicle transmission and the engine vehicle transmission according to the first embodiment, and FIG. 3 is a schematic cross section of the engine vehicle transmission using the shared portion of the first embodiment. FIG. As shown in FIG. 2, the hybrid vehicle transmission and the engine vehicle transmission share a transmission case 1, a housing 2, and a plurality of gear trains accommodated in the transmission case 1. In addition, the fifth-speed drive gear G5in and the third sync mechanism S3, which mesh with the motor drive gear Min provided outside the transmission case 1, are shared. Furthermore, the housing 2 provided between the transmission case 1 and the engine is shared. Hereinafter, these shared parts are referred to as shared modules.

  Thus, when configuring the engine vehicle transmission, the fifth speed driven gear G5out is attached to the output shaft Output of the common module, and the side cover 3 is attached. On the other hand, when configuring a transmission for a hybrid vehicle, a 5-speed driven gear G5out and a fourth synchronization mechanism S4 are attached to the output shaft Output of the common module, and the motor case 4 housing the motor 40 is connected to the transmission case 1. At the same time, the side cover 5 is attached to the motor case 4. As described above, only the gear train (fifth-speed gear train in the first embodiment) with which the motor drive gear Min is engaged is installed outside the transmission case 1 and the other gear trains are housed in the transmission case 1. By configuring the control module, most of the housing accommodated in the transmission case 1 can be shared. Further, by providing the transmission case 1 with the bearings 11 and 12 and the housing 2 with the bearings 21 and 22, the shared portion can be modularized. If the bearing is provided on the side cover side, the transmission cannot be assembled until it is determined whether to manufacture an engine vehicle transmission or a hybrid vehicle transmission. On the other hand, in the case of the first embodiment, the module can be used even before it is determined whether to manufacture the engine vehicle transmission or the hybrid vehicle transmission by modularizing the shared portion. Can be manufactured.

As described above, the effects listed below can be obtained in the embodiment.
(1) An input shaft Input connected to the engine, an output shaft Output connected to the drive wheels, a plurality of drive gears G1in, G2in, G3in, G4in, G5in provided on the input shaft Input, and an output shaft Output A plurality of driven gears G1out, G2out, G3out, G4out, G5out that are provided and meshed with the plurality of drive gears G1in, G2in, G3in, G4in, G5in, and a plurality of gear trains that meshed with the drive gear and the driven gear, Between the transmission case 1 that houses a gear train other than the fifth gear train (specific gear train) with which the motor drive gear Min (motor drive gear) meshes, and between the fifth gear train and the other gear train, Bearings 11 and 12 that rotatably support the input shaft Input and the output shaft Output on the transmission case 1, and the transmission case 1 Attached, the side cover 5 for accommodating the fifth speed gear train, comprising a.
Therefore, in addition to the components in the transmission, the transmission case 1 can be shared between the engine vehicle and the hybrid vehicle, and the manufacturing cost can be suppressed.

(2) The housing 2 is provided between the transmission case 1 and the engine, and the second bearings 21 and 22 that rotatably support the input shaft Input and the output shaft Output on the housing 2 are provided.
Therefore, the bearings 21 and 22 are provided in a configuration shared between the engine vehicle transmission and the hybrid vehicle transmission, so that the shared portion can be modularized and it is determined which transmission to manufacture. Even before the process, modularized parts can be manufactured.

(3) Input of the 5-speed drive gear G5in and 5-speed driven gear G5out of the 5-speed gear train between the 5-speed drive gear G5in and 5-speed driven gear G5out of the 5-speed gear train and the input shaft Input and output shaft Output A third sync mechanism S3 and a fourth sync mechanism S4 (connecting device) capable of switching between a floating state and a fixed state with respect to the shaft Input and the output shaft Output are provided.
Therefore, the torque of the motor 40 can be selectively transmitted to the input shaft Input or the output shaft Output, and the efficiency during hybrid traveling can be increased according to the traveling state.

(4) The motor case 4 that houses the motor 40 is provided. The motor case 4 is attached to the side cover 5, and the motor drive gear Min is housed in the side cover 5.
Therefore, the engine vehicle transmission and the hybrid vehicle transmission can be individually provided only by changing the shape of the side cover 5.

As mentioned above, although this invention was demonstrated based on Example 1, it is included in this invention even if it is another structure. For example, in the first embodiment, the fifth gear train is set as the specific gear train, but other gear trains may be used as the specific gear train. In this case, the specific gear train may be disposed outside the transmission case 1.
In the first embodiment, the input shaft Input and the output shaft Output are each provided with two synchronization mechanisms. However, the input shaft Input or the output shaft Output may be provided with all the synchronization mechanisms.
Further, in the first embodiment, when the hybrid vehicle transmission is configured, the configuration in which both the 5-speed drive gear G5in and the 5-speed driven gear G5out of the 5-speed gear train are provided with the synchronization mechanism is shown. It is good also as a structure which provided the synchro mechanism only in the gear.
In the first embodiment, the fifth speed driving gear G5in and the motor driving gear Min are always meshed with each other. However, the fifth speed driven gear G5out and the motor driving gear Min may be constantly meshed.

DESCRIPTION OF SYMBOLS 1 Transmission case 2 Housing 3 Side cover 4 Motor case 5 Side cover 11, 12 Bearing 21, 22 Bearing 40 Motor G1in, G2in, G3in, G4in, G5in Drive gear G1out, G2out, G3out, G4out, G5out Drive gear input Input shaft Min Motor drive gear Output Output shaft S1 First sync mechanism S2 Second sync mechanism S3 Third sync mechanism S4 Fourth sync mechanism TM Transmission

Claims (4)

An input shaft coupled to the engine;
An output shaft coupled to the drive wheels;
A plurality of drive gears provided on the input shaft;
A plurality of driven gears provided on the output shaft and meshing with the plurality of drive gears;
A transmission case that houses a gear train other than the specific gear train meshed with the drive gear of the motor among the plurality of gear trains meshed with the drive gear and the driven gear;
A bearing that rotatably supports the input shaft and the output shaft on the transmission case between the specific gear train and the other gear train;
A side cover attached to the transmission case and storing the specific gear train;
A transmission for a hybrid vehicle comprising: The transmission for a hybrid vehicle according to claim 1,
A housing between the transmission case and the engine;
A hybrid vehicle transmission comprising a second bearing that rotatably supports the input shaft and the output shaft on the housing. The hybrid vehicle transmission according to claim 1 or 2,
Switchable between a drive gear and a driven gear of the specific gear train and an input shaft and an output shaft between a floating state and a fixed state of the drive gear and the driven gear of the specific gear train with respect to the input shaft and the output shaft. A hybrid vehicle transmission comprising a connecting device. The transmission for a hybrid vehicle according to any one of claims 1 to 3,
A motor case for housing the motor;
The transmission for a hybrid vehicle, wherein the motor case is attached to the side cover, and a drive gear of the motor is housed in the side cover.

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