Drive device

Abstract

The invention relates to a driving device. The driving device is equipped with a first motor. The drive device is provided with a first rotating shaft that rotates integrally with a rotor of the first motor. A drive device is provided with a first countershaft which is disposed parallel to a first rotating shaft and which is connected to the first rotating shaft via a first counter gear. The drive device is provided with a first transmission shaft which is disposed coaxially with the first rotating shaft and which is connected to the first countershaft via a second counter gear. A series of oil passages are formed in the first rotating shaft and the first transmission shaft.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a drive device for a vehicle. Background Art

[0002] Japanese Patent Application Laid-Open No. 2020-178520 discloses a vehicle drive device equipped with an electric motor and various gears. The electric motor and the various gears are lubricated by separate oil passages. Summary of the invention

[0003] Since the motor and the counter gear are lubricated by separate oil passages, the total length of the oil passages may be increased, and in this case, there is a concern that the lubrication efficiency may be reduced.

[0004] The drive device disclosed in this specification is a drive device for a vehicle. The drive device is equipped with a first electric motor. The drive device is equipped with a first rotating shaft that rotates integrally with the rotor of the first electric motor. The drive device is equipped with a first secondary shaft, which is arranged in parallel with the first rotating shaft and is connected to the first rotating shaft via a first counter gear. The drive device is equipped with a first transmission shaft, which is arranged coaxially with the first rotating shaft and is connected to the first secondary shaft via a second counter gear. A series of oil passages are formed inside the first rotating shaft and the first transmission shaft.

[0005] The counter gear is equipped with a pair of gears meshing with each other. In the above structure, the first rotating shaft and the first transmission shaft can form a common oil circuit. In addition, the common oil circuit can be used to supply lubricating oil to the first motor, the first counter gear and the second counter gear. Since the total length of the oil circuit can be suppressed, the lubrication efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Features, advantages, and technical and industrial significance of embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like parts, and in which:

[0007] Figure 1 is a diagram showing a schematic structure of the drive device 10;

[0008] Figure 2 is an enlarged cross-sectional view of the left drive system 90L; and

[0009] Figure 3 It is an enlarged cross-sectional view of the right drive system 90R. DETAILED DESCRIPTION

[0010] The following lists additional features of the drive device disclosed in this specification.

[0011] One end of one of the first rotating shaft and the first transmission shaft may also be inserted into the other of the first rotating shaft and the first transmission shaft.

[0012] According to the above configuration, an oil passage without cracks can be formed by using the first rotating shaft and the first transmission shaft.

[0013] The first rotating shaft may also be provided with a first oil hole extending from the oil passage to the outer peripheral surface of the first rotating shaft.

[0014] According to the above configuration, part of the lubricating oil flowing through the oil passage inside the first rotating shaft can be supplied to the first counter gear via the first oil hole, so that the first counter gear can be lubricated appropriately.

[0015] The first transmission shaft may also be provided with a second oil hole extending from the oil passage to the outer peripheral surface of the first transmission shaft.

[0016] According to the above configuration, part of the lubricant flowing through the oil passage inside the first transmission shaft can be supplied to the second counter gear via the first oil hole, so that the second counter gear can be lubricated appropriately.

[0017] The first rotating shaft may also be provided with a first motor shaft, a portion of which is located in the first motor. The first rotating shaft may also be arranged coaxially with the first motor shaft and provided with a first intermediate shaft fixed to the first motor shaft. The first oil hole may also be arranged in the first intermediate shaft.

[0018] According to the above configuration, a part of the lubricant flowing through the oil passage inside the first intermediate shaft can be supplied to the first counter gear via the first oil hole.

[0019] The drive device may also be equipped with a second electric motor. The drive device may also be equipped with a second rotating shaft that rotates integrally with the rotor of the second electric motor. The second rotating shaft may also extend in the front-rear direction of the vehicle and be arranged in parallel with the first rotating shaft. The drive device may also be equipped with a second secondary shaft that is arranged in parallel with the second rotating shaft and is connected to the second rotating shaft via a third counter gear. The drive device may also be equipped with a second transmission shaft that is coaxially arranged with the second rotating shaft and is connected to the second secondary shaft via a fourth counter gear. The drive device may also be equipped with a first drive shaft that extends in the vehicle width direction of the vehicle, one end of which is connected to the first transmission shaft via a first hypoid gear, and the other end of which is connected to the right wheel. The drive device may also be equipped with a second drive shaft that extends in the vehicle width direction of the vehicle, one end of which is connected to the second transmission shaft via a second hypoid gear, and the other end of which is connected to the left wheel. The second rotating shaft and the second transmission shaft may also have a series of oil passages formed inside.

[0020] According to the above structure, two independent drive systems can be provided to drive the left and right wheels respectively. Furthermore, the two drive systems can be provided with oil circuits composed of a rotating shaft and a transmission shaft respectively. In a drive device provided with two independent drive systems, the total length of the oil circuit can be suppressed.

[0021] Schematic structure of the driving device 10

[0022] exist Figure 1 Schematic diagram of the structure of the driving device 10 of this embodiment is shown in FIG. Figure 1 This is a top view of the vehicle from above. Figure 1 In the figure, arrow FR indicates the front of the vehicle, arrow RH indicates the right side of the vehicle, and arrow UP indicates the top of the vehicle. The same is true in other figures.

[0023] The drive device 10 has a housing 12. Inside the housing 12, a left motor chamber 13L and a right motor chamber 13R, a left reversing gear chamber 15L and a right reversing gear chamber 15R, and a left hyperbolic gear chamber 16L and a right hyperbolic gear chamber 16R are provided. A left drive system 90L is arranged inside the left motor chamber 13L, the left reversing gear chamber 15L, and the left hyperbolic gear chamber 16L. A right drive system 90R is arranged inside the right motor chamber 13R, the right reversing gear chamber 15R, and the right hyperbolic gear chamber 16R. The left drive system 90L and the right drive system 90R are symmetrical with each other. Therefore, in the following, the left drive system 90L is sometimes mainly described.

[0024] Next, the left drive system 90L will be described. The first motor 20 is housed in the left motor chamber 13L. The first motor 20 is provided with a rotating shaft 20c extending in the front-rear direction of the vehicle. The left counter gear chamber 15L contains a secondary shaft 23 and a transmission shaft 24. The secondary shaft 23 is arranged parallel to the rotating shaft 20c. The secondary shaft 23 is connected to the rotating shaft 20c via a counter gear 21. The counter gear 21 is provided with a gear 21a fixed to the rotating shaft 20c and a gear 21b fixed to the secondary shaft 23.

[0025] The transmission shaft 24 is arranged parallel to the counter shaft 23 and is provided coaxially with the rotating shaft 20c. The transmission shaft 24 is connected to the counter shaft 23 via the counter gear 22. The counter gear 22 includes a gear 22a fixed to the counter shaft 23 and a gear 22b fixed to the transmission shaft 24.

[0026] The left hypoid gear chamber 16L contains a drive shaft 27 extending in the vehicle width direction. The end of the drive shaft 27 on the vehicle inner side is connected to the drive shaft 24 via a hypoid gear 28. The hypoid gear 28 is provided with a drive gear 28a fixed to the drive shaft 24 and a side gear 28b fixed to the drive shaft 27. The end of the drive shaft 27 on the vehicle outer side is connected to the left rear wheel 92.

[0027] Next, the right drive system 90R is described. The second motor 60 is housed in the right motor chamber 13R. The second motor 60 is provided with a rotating shaft 60c extending in the front-rear direction of the vehicle. The right counter gear chamber 15R contains a secondary shaft 63 and a transmission shaft 64. The secondary shaft 63 is arranged parallel to the rotating shaft 60c. The secondary shaft 63 is connected to the rotating shaft 60c via a counter gear 61. The counter gear 61 is provided with a gear 61a fixed to the rotating shaft 60c and a gear 61b fixed to the secondary shaft 63.

[0028] The transmission shaft 64 is arranged parallel to the counter shaft 63 and is provided coaxially with the rotating shaft 60c. The transmission shaft 64 is connected to the counter shaft 63 via the counter gear 62. The counter gear 62 includes a gear 62a fixed to the counter shaft 63 and a gear 62b fixed to the transmission shaft 64.

[0029] In the right hypoid gear chamber 16R, a drive shaft 67 extending in the vehicle width direction of the vehicle is accommodated. The end of the drive shaft 67 on the vehicle inner side is connected to the transmission shaft 64 via a hypoid gear 68. The hypoid gear 68 is equipped with a drive gear 68a fixed to the transmission shaft 64 and a side gear 68b fixed to the drive shaft 67. The end of the drive shaft 67 on the vehicle outer side is connected to the right rear wheel 93.

[0030] Positional Relationship

[0031] exist Figure 1 In the embodiment, the region between the secondary shaft 23 and the secondary shaft 63 in the vehicle width direction is defined as region R2. The rotating shaft 20c and the rotating shaft 60c are located in region R2. In addition, the transmission shaft 24 and the transmission shaft 64 are also located in region R2.

[0032] exist Figure 1 In the figure, a region between the propeller shaft 24 and the propeller shaft 64 in the vehicle width direction is defined as a region R1. The side gear 28b and the side gear 68b are located in the region R1.

[0033] The width of the case 12 that divides the left and right hypoid gear chambers 16L and 16R in the vehicle width direction is defined as width W1. The width of the case 12 that divides the left and right counter gear chambers 15L and 15R in the vehicle width direction is defined as width W2. Width W1 is smaller than width W2.

[0034] Specific structural example of the left drive system 90L

[0035] use Figure 2 A specific configuration example of the left drive system 90L will be described. Figure 2It is an enlarged sectional view of the left drive system 90L. The first motor 20 has a rotor 20a and a stator 20b. The stator 20b is arranged around the rotor 20a. The rotor 20a has a rotating shaft 20c. The rotating shaft 20c has a motor shaft 20c-1 and an intermediate shaft 20c-2. The motor shaft 20c-1 and the intermediate shaft 20c-2 each have a cylindrical shape. That is, the rotating shaft 20c is hollow. A portion of the motor shaft 20c-1 is located in the first motor 20. The rear end of the motor shaft 20c-1 is inserted into the front end of the intermediate shaft 20c-2. The motor shaft 20c-1 is fixed to the intermediate shaft 20c-2 by spline fitting.

[0036] The secondary shaft 23 and the transmission shaft 24 are rotatably supported by bearings provided in the housing 12. The transmission shaft 24 is arranged behind the rotating shaft 20c. The transmission shaft 24 extends coaxially with the rotating shaft 20c. More specifically, the central axis of the transmission shaft 24 coincides with the extension of the central axis of the rotating shaft 20c. The front end portion 24e of the transmission shaft 24 is inserted into the central hole of the rotating shaft 20c from the rear end of the rotating shaft 20c. The gap between the outer peripheral surface of the transmission shaft 24 and the inner peripheral surface of the rotating shaft 20c is sealed by an oil seal 26.

[0037] The rear end of the transmission shaft 24 passes through the through hole 18L and extends from the left counter gear chamber 15L to the left hypoid gear chamber 16L. The gap between the outer peripheral surface of the transmission shaft 24 and the inner peripheral surface of the through hole 18L is sealed by an oil seal 25 .

[0038] The drive device 10 has an oil circulation oil passage 35. The oil pump 30 is provided in the oil circulation oil passage 35. The upstream end of the oil circulation oil passage 35 is connected to the oil suction port 34. The oil suction port 34 is arranged at the bottom of the left counter gear chamber 15L. As described above, the rotating shaft 20c has a cylindrical shape. The shaft oil passage 36 (see the dotted arrow) is formed by using the center hole of the rotating shaft 20c. The downstream end of the oil circulation oil passage 35 is connected to the front end of the shaft oil passage 36.

[0039] The motor shaft 20c-1 is provided with a plurality of motor oil holes 40. The motor oil holes 40 extend from the shaft oil passage 36 to the outer peripheral surface of the rotating shaft 20c. The intermediate shaft 20c-2 is provided with a plurality of first oil holes 42. The first oil holes 42 extend from the shaft oil passage 36 to the outer peripheral surface of the intermediate shaft 20c-2.

[0040] Inside the transmission shaft 24, an axial oil passage 38 extending along the central axis thereof is provided (see the dotted arrow). The front end of the axial oil passage 38 is connected to the axial oil passage 36. That is, a common oil passage is formed by the axial oil passage 36 of the rotating shaft 20c and the axial oil passage 38 of the transmission shaft 24. The transmission shaft 24 is provided with a plurality of second oil holes 44. The second oil holes 44 extend from the axial oil passage 38 to the outer peripheral surface of the transmission shaft 24.

[0041] During the operation of the first motor 20, the oil pump 30 operates. When the oil pump 30 operates, the lubricating oil remaining at the bottom of the left counter gear chamber 15L is supplied to the shaft oil passage 36 in the rotating shaft 20c via the oil suction port 34 and the oil circulation oil passage 35. The lubricating oil flows backward in the shaft oil passage 36. The first motor 20 is cooled by the lubricating oil flowing in the shaft oil passage 36. A part of the lubricating oil in the shaft oil passage 36 is discharged from the motor oil hole 40 and the first oil hole 42. The first motor 20 is lubricated by the lubricating oil discharged from the motor oil hole 40. In addition, as shown by the dotted arrow A11, the counter gear 21 is lubricated and cooled by the lubricating oil discharged from the first oil hole 42.

[0042] The lubricating oil flowing to the rear end in the shaft oil passage 36 flows into the shaft oil passage 38 in the transmission shaft 24. A portion of the lubricating oil in the shaft oil passage 38 is discharged from the second oil hole 44. As shown by the dotted arrow A12, the counter gear 22 is lubricated and cooled by the lubricating oil discharged from the second oil hole 44.

[0043] Specific structural example of the right drive system 90R

[0044] use Figure 3 A specific configuration example of the right drive system 90R will be described. Figure 3 It is an enlarged cross-sectional view of the right drive system 90R. Figure 3 The right drive system 90R with Figure 2 The left drive system 90L is symmetrical. Thus, the structure of the right drive system 90R is the same as the structure of the left drive system 90L described above.

[0045] That is, the right drive system 90R is equipped with a second motor 60, a motor shaft 60c-1, an intermediate shaft 60c-2, counter gears 61 and 62, a counter shaft 63, a transmission shaft 64, oil seals 65 and 66, a drive shaft 67, and a hypoid gear 68. In addition, the right drive system 90R is equipped with an oil pump 70, an oil suction port 74, an oil circulation oil path 75, shaft oil paths 76 and 78, a motor oil hole 80, a first oil hole 82, and a second oil hole 84. The counter gear 61 is lubricated and cooled by the lubricating oil discharged from the first oil hole 82 (refer to the dotted arrow A21). In addition, the counter gear 62 is lubricated and cooled by the lubricating oil discharged from the second oil hole 84 (refer to the dotted arrow A22). In addition, since the specific contents of the components of the right drive system 90R are the same as those of the left drive system 90L described above, detailed descriptions are omitted.

[0046] Effect

[0047] In the left drive system 90L of the drive device 10 of the present embodiment, the shaft oil circuit 36 ​​of the rotating shaft 20c and the shaft oil circuit 38 of the transmission shaft 24 can be used to form a common oil circuit. That is, lubricating oil can be supplied to the shaft oil circuit 38 via the shaft oil circuit 36. Thus, lubricating oil can be supplied to the first motor 20, the counter gear 21, and the counter gear 22 using the common oil circuit. Compared with the case where the first motor 20, the counter gear 21, and the counter gear 22 are lubricated using separate oil circuits, the total length of the oil circuit can be suppressed. The lubrication efficiency can be improved.

[0048] Similarly, in the right drive system 90R of the drive device 10 of the present embodiment, the shaft oil path 76 of the rotating shaft 60c and the shaft oil path 78 of the transmission shaft 64 can form a common oil path. In addition, the common oil path can be used to supply lubricating oil to the second motor 60, the counter gear 61, and the counter gear 62. Since the total length of the oil path can be reduced, the lubrication efficiency can be improved.

[0049] The above detailed description of the implementation methods is provided, but these are merely examples and do not limit the scope of the claims. The techniques described in the claims include solutions obtained by various deformations and changes to the specific examples illustrated above. The technical elements described in this specification or the drawings exert technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of application. In addition, the techniques illustrated in this specification or the drawings achieve multiple purposes at the same time, and achieving one of the purposes itself also has technical usefulness.

[0050] Modifications

[0051] The transmission shaft 24 and the transmission shaft 64 may be located at any position as long as they are within the region R2 between the secondary shaft 23 and the secondary shaft 63. For example, in a plan view, the transmission shaft 24 of the left drive system 90L may be disposed between the rotating shaft 20c and the secondary shaft 23. In addition, the transmission shaft 64 of the right drive system 90R may be disposed between the rotating shaft 60c and the secondary shaft 63. Thus, the length L1 of the counter gear chamber in the vehicle front-rear direction may be shortened.

[0052] The rotating shaft 20c and the rotating shaft 60c are not limited to the form in which a plurality of shafts are fitted, and may be, for example, a single shaft.

[0053] The front end of transmission shaft 24 and transmission shaft 64 separately also can not be inserted in the center hole of rotating shaft 20c and rotating shaft 60c separately. In this case, the front end of transmission shaft 24 and transmission shaft 64 separately and the rear end of rotating shaft 20c and rotating shaft 60c separately also can be separated.

[0054] The rear ends of the rotating shaft 20 c and the rotating shaft 60 c may be respectively inserted into the center holes of the front ends of the transmission shaft 24 and the transmission shaft 64 .

[0055] The present application is not limited to the structure equipped with two independent left drive systems 90L and right drive systems 90R. In order to drive the left and right wheels, the technology of this specification can also be applied to the structure using a common drive system.

[0056] A mode may be adopted in which the hypoid gear 28 and the hypoid gear 68 are not provided. In this case, the rotating shaft 20c and the rotating shaft 60c may extend in the width direction of the vehicle.

[0057] The rotating shaft 20c is an example of a first rotating shaft. The counter gear 21 is an example of a first counter gear. The counter shaft 23 is an example of a first counter shaft. The counter gear 22 is an example of a second counter gear. The transmission shaft 24 is an example of a first transmission shaft. The counter gear 61 is an example of a third counter gear. The counter shaft 63 is an example of a second counter shaft. The counter gear 62 is an example of a fourth counter gear. The transmission shaft 64 is an example of a second transmission shaft.

Claims

1. A vehicle drive device, wherein: Equipped with: a first electric motor; a first rotating shaft that rotates integrally with a rotor of the first motor; a first counter shaft, the first counter shaft being arranged in parallel with the first rotating shaft and being connected to the first rotating shaft via a first counter gear; as well as a first transmission shaft, the first transmission shaft being coaxially arranged with the first rotating shaft and connected to the first counter shaft via a second counter gear, A series of oil passages are formed inside the first rotating shaft and the first transmission shaft.

2. The driving device according to claim 1, wherein: One end of one of the first rotating shaft and the first transmission shaft is inserted into the other of the first rotating shaft and the first transmission shaft.

3. The driving device according to claim 2, wherein: The first rotating shaft is provided with a first oil hole extending from the oil passage to an outer peripheral surface of the first rotating shaft.

4. The driving device according to claim 3, wherein: The first transmission shaft is provided with a second oil hole extending from the oil passage to the outer peripheral surface of the first transmission shaft.

5. The driving device according to claim 4, wherein: The first rotating shaft is equipped with: a first motor shaft, a portion of which is located within the first motor; and a first intermediate shaft, the first intermediate shaft being coaxially arranged with the first motor shaft and being fixed to the first motor shaft; The first oil hole is disposed on the first intermediate shaft.

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