Drive device

Abstract

The drive device includes a first motor having a first rotating shaft and a second motor having a second rotating shaft. The drive device includes a first countershaft connected to the first rotating shaft via a first pinion and a second countershaft connected to the second rotating shaft via a second pinion. The drive device includes a first propeller shaft connected to the first countershaft via a third pinion and a second propeller shaft connected to the second countershaft via a fourth pinion. The drive device includes a first drive shaft connected to the first propeller shaft via a first hypoid gear and a second drive shaft connected to the second propeller shaft via a second hypoid gear. The first rotation shaft and the second rotation shaft are located between the first countershaft and the second countershaft in a vehicle width direction of the vehicle. The first propeller shaft and the second propeller shaft are located between the first countershaft and the second countershaft in the vehicle width direction of the vehicle.

Description

Technical Field

[0001] The present disclosure relates to a driving device for a vehicle. Background Art

[0002] The vehicle drive device disclosed in China Utility Model Announcement No. 206708313 has two independent motors for driving the left wheel and the right wheel respectively. The two motors each have a pair of rotating shafts extending in the front-rear direction of the vehicle. The pair of rotating shafts are connected to a pair of transmission shafts via a pinion gear. The pair of transmission shafts are connected to a pair of drive shafts via a hypoid gear. The pair of drive shafts extend in the vehicle width direction. Wheels are connected to the ends of the pair of drive shafts. Summary of the invention

[0003] Since only one pinion is used in the drive device of China Utility Model Publication No. 206708313, it is sometimes difficult to sufficiently increase the reduction ratio. In addition, when adding a pinion to sufficiently increase the reduction ratio, the drive device may become larger in the vehicle width direction.

[0004] The drive device disclosed in this specification is a drive device for a vehicle. The drive device includes a first motor, which includes a first rotating shaft extending in the front-rear direction of the vehicle. The drive device includes a second motor, which includes a second rotating shaft extending in the front-rear direction of the vehicle. The drive device includes 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 secondary gear. The drive device includes a second secondary shaft, which is arranged in parallel with the second rotating shaft and is connected to the second rotating shaft via a second secondary gear. The drive device includes a first transmission shaft, which is arranged in parallel with the first secondary shaft and is connected to the first secondary shaft via a third secondary gear. The drive device includes a second transmission shaft, which is arranged in parallel with the second secondary shaft and is connected to the second secondary shaft via a fourth secondary gear. The drive device includes a first drive shaft, which 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 is connected to the left wheel. The drive device includes a second drive shaft, which extends in the vehicle width direction, 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 right wheel. When the vehicle is viewed from the top and bottom directions, the first rotation shaft and the second rotation shaft are located between the first secondary shaft and the second secondary shaft in the vehicle width direction. The first transmission shaft and the second transmission shaft are located between the first secondary shaft and the second secondary shaft in the vehicle width direction.

[0005] The sub-gear has a pair of gears meshing with each other. In the above structure, the power of the first rotating shaft can be transmitted to the first transmission shaft via the first sub-gear and the third sub-gear. Similarly, the power of the second rotating shaft can be transmitted to the second transmission shaft via the second sub-gear and the fourth sub-gear. Compared with the case where only one sub-gear is used to transmit power, the reduction ratio can be increased. Moreover, the first transmission shaft and the second transmission shaft are located between the first sub-shaft and the second sub-shaft in the vehicle width direction of the vehicle. As a result, the size of the drive device in the vehicle width direction can be suppressed while the reduction ratio is fully increased. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0007] Figure 1 It is a diagram showing a schematic configuration of the driving device 10 .

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

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

[0010] Figure 4 It is a diagram showing a schematic configuration of a driving device 110 according to a comparative example. DETAILED DESCRIPTION

[0011] Additional features of the drive device disclosed in this specification are listed below.

[0012] The first rotating shaft and the first transmission shaft may be coaxially located. The second rotating shaft and the second transmission shaft may be coaxially located.

[0013] The first rotating shaft and the second rotating shaft may be hollow. The first transmission shaft may have one end inserted into the interior of the first rotating shaft. The second transmission shaft may have one end inserted into the interior of the second rotating shaft.

[0014] According to the above configuration, the protrusion amount of the first transmission shaft and the second transmission shaft in the vehicle front-rear direction can be suppressed, and the volume of the drive device can be reduced.

[0015] The first transmission shaft and the second transmission shaft may be hollow. The drive device may further include a first oil seal, which seals between the outer circumference of the first transmission shaft and the inner circumference of the first rotating shaft. The drive device may further include a second oil seal, which seals between the outer circumference of the second transmission shaft and the inner circumference of the second rotating shaft. A first oil circuit may be formed by the first rotating shaft and the first transmission shaft. A second oil circuit may be formed by the second rotating shaft and the second transmission shaft.

[0016] According to the above structure, the rotating shaft and the transmission shaft can be lubricated and cooled by the common lubricating oil, and the lubricating oil can be circulated efficiently.

[0017] The first hypoid gear may include a first drive gear fixed to the first transmission shaft and a first side gear fixed to the first drive shaft. The second hypoid gear may include a second drive gear fixed to the second transmission shaft and a second side gear fixed to the second drive shaft. When the vehicle is viewed from above, the first side gear and the second side gear may be located between the first transmission shaft and the second transmission shaft in the vehicle width direction.

[0018] According to the above configuration, the volume of the drive device in the vehicle width direction can be reduced in size in the region where the first hypoid gear and the second hypoid gear are arranged.

[0019] Schematic structure of the driving device 10

[0020] Figure 1 The schematic structure of the driving device 10 of this embodiment is shown. Figure 1 This is a top view of the vehicle from above. Figure 1 In the figure, the arrow "front" indicates the front of the vehicle, the arrow "right" indicates the right of the vehicle, and the arrow "up" indicates the top of the vehicle. The same applies to the other drawings.

[0021] The drive device 10 has a housing 12. A left motor chamber 13L and a right motor chamber 13R, a left sub-gear chamber 15L and a right sub-gear chamber 15R, and a left hypoid gear chamber 16L and a right hypoid gear chamber 16R are provided inside the housing 12. A left drive system 90L is arranged inside the left motor chamber 13L, the left sub-gear chamber 15L, and the left hypoid gear chamber 16L. A right drive system 90R is arranged inside the right motor chamber 13R, the right sub-gear chamber 15R, and the right hypoid gear chamber 16R. The left drive system 90L and the right drive system 90R are symmetrical with each other. Therefore, the following mainly describes the left drive system 90L.

[0022] The left drive system 90L is described. The first motor 20 is housed in the left motor chamber 13L. The first motor 20 has a rotating shaft 20c extending in the front-rear direction of the vehicle. The countershaft 23 and the transmission shaft 24 are housed in the left counter gear chamber 15L. The countershaft 23 is arranged parallel to the rotating shaft 20c. The countershaft 23 is connected to the rotating shaft 20c via the counter gear 21. The counter gear 21 has a gear 21a fixed to the rotating shaft 20c and a gear 21b fixed to the countershaft 23.

[0023] The transmission shaft 24 is arranged in parallel with the counter shaft 23 and is coaxial with the rotating shaft 20c. The transmission shaft 24 is connected to the counter shaft 23 via the pinion 22. The pinion 22 includes a gear 22a fixed to the counter shaft 23 and a gear 22b fixed to the transmission shaft 24.

[0024] The left hypoid gear chamber 16L accommodates 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 transmission shaft 24 via a hypoid gear 28. The hypoid gear 28 includes a drive gear 28a fixed to the transmission 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.

[0025] The right drive system 90R is described. The second motor 60 is housed in the right motor chamber 13R. The second motor 60 has a rotating shaft 60c extending in the front-rear direction of the vehicle. The secondary shaft 63 and the transmission shaft 64 are housed in the right secondary gear chamber 15R. The secondary shaft 63 is arranged parallel to the rotating shaft 60c. The secondary shaft 63 is connected to the rotating shaft 60c via the secondary gear 61. The secondary gear 61 has a gear 61a fixed to the rotating shaft 60c and a gear 61b fixed to the secondary shaft 63.

[0026] The transmission shaft 64 is arranged in parallel with the counter shaft 63 and is coaxial with the rotation shaft 60c. The transmission shaft 64 is connected to the counter shaft 63 via the pinion 62. The pinion 62 includes a gear 62a fixed to the counter shaft 63 and a gear 62b fixed to the transmission shaft 64.

[0027] The right hypoid gear chamber 16R accommodates a drive shaft 67 extending in the vehicle width direction. 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 includes 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.

[0028] Positional Relationship

[0029] exist Figure 1 In the embodiment, the region between the secondary shafts 23 and 63 in the vehicle width direction is defined as region R2. The rotation shafts 20c and 60c are located in region R2. In addition, the transmission shafts 24 and 64 are also located in region R2.

[0030] exist Figure 1 In the embodiment of the present invention, a region between the propeller shafts 24 and 64 in the vehicle width direction is defined as a region R1. The side gears 28b and 68b are located in the region R1.

[0031] The width of the case 12 in the vehicle width direction that divides the left hypoid gear chamber 16L and the right hypoid gear chamber 16R is defined as width W1. In addition, the width of the case 12 in the vehicle width direction that divides the left auxiliary gear chamber 15L and the right auxiliary gear chamber 15R is defined as width W2. Width W1 is smaller than width W2.

[0032] Specific structural example of the left drive system 90L

[0033] use Figure 2 A specific configuration example of the left drive system 90L will be described. Figure 2 It 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 have a cylindrical shape respectively. That is, the rotating shaft 20c is hollow. A part 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 top end of the intermediate shaft 20c-2. The motor shaft 20c-1 is fixed to the intermediate shaft 20c-2 by spline fitting.

[0034] 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 line 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.

[0035] The rear end of the transmission shaft 24 extends from the left counter gear chamber 15L to the left hypoid gear chamber 16L through the through hole 18L. 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 .

[0036] The drive device 10 has an oil circulation oil circuit 35. An oil pump 30 is provided in the oil circulation oil circuit 35. The upstream end of the oil circulation oil circuit 35 is connected to the oil suction port 34. The oil suction port 34 is arranged at the bottom of the left auxiliary gear chamber 15L. As described above, the rotating shaft 20c has a cylindrical shape. The shaft oil circuit 36 ​​(see the dotted arrow) is formed by the center hole of the rotating shaft 20c. The downstream end of the oil circulation oil circuit 35 is connected to the front end of the shaft oil circuit 36.

[0037] 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.

[0038] An axial oil passage 38 (see the dotted arrow) extending along the central axis of the transmission shaft 24 is provided inside the transmission shaft 24. 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. A plurality of second oil holes 44 are provided on the transmission shaft 24. The second oil holes 44 extend from the axial oil passage 38 to the outer peripheral surface of the transmission shaft 24.

[0039] During the operation of the first motor 20, the oil pump 30 is operated. When the oil pump 30 is operated, the lubricating oil stored in the bottom of the left auxiliary 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 rearward in the shaft oil passage 36. The first motor 20 is cooled by the lubricating oil flowing in the shaft oil passage 36. A portion 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 auxiliary gear 21 is lubricated and cooled by the lubricating oil discharged from the first oil hole 42.

[0040] 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 pinion 22 is lubricated and cooled by the lubricating oil discharged from the second oil hole 44.

[0041] Specific structural example of the right drive system 90R

[0042] 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. Therefore, the structure of the right drive system 90R is the same as that of the left drive system 90L.

[0043] That is, the right drive system 90R includes a second motor 60, a motor shaft 60c-1, an intermediate shaft 60c-2, pinions 61 and 62, a pinion 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 includes 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 pinion 61 is lubricated and cooled by the lubricating oil discharged from the first oil hole 82 (see dotted arrow A21). In addition, the pinion 62 is lubricated and cooled by the lubricating oil discharged from the second oil hole 84 (see dotted arrow A22). In addition, the specific contents of the components of the right drive system 90R are the same as those of the left drive system 90L, so detailed descriptions are omitted.

[0044] Effect

[0045] use Figure 4 The subject is explained with reference to the driving device 110 of the comparative example shown in FIG. In addition, in the driving device 110 of the comparative example, the driving device 10 ( Figure 1 ) are given the same figure marks. The driving device 110 of the comparative example includes transmission shafts 124 and 164. The front ends of the transmission shafts 124 and 164 are connected to the rotating shafts 20c and 60c via the pinion gears 21 and 61, respectively. The rear ends of the transmission shafts 124 and 164 are connected to the driving shafts 27 and 67 via the hypoid gears 28 and 68, respectively. In the driving device 110 of the comparative example, the left drive system 90L uses only one pinion gear 21 to reduce speed, and the right drive system 90R uses only one pinion gear 61 to reduce speed. In addition, in the vehicle width direction of the vehicle, there is a region R101 between the transmission shafts 124 and 164. In addition, the width in the vehicle width direction of the housing 112 that divides the left hypoid gear chamber 116L and the right hypoid gear chamber 116R is a width W102.

[0046] On the other hand, in the driving device 10 ( Figure 1) in the left drive system 90L, the power of the rotating shaft 20c can be decelerated via both the pinion 21 and the pinion 22. Similarly, in the right drive system 90R, the power of the rotating shaft 60c can be decelerated via both the pinion 61 and the pinion 62. Compared with the drive device 110 of the comparative example that uses only one pinion for deceleration, the reduction ratio can be increased. Moreover, in the drive device 10 of the present embodiment, the transmission shafts 24 and 64 are located in the region R2 between the pinion 23 and 63. Thus, the region R1 of the drive device 10 of the present embodiment can be made smaller than the region R101 of the drive device 110 of the comparative example. That is, the drive device 10 of the present embodiment can reduce the distance in the vehicle width direction between the transmission shafts compared with the drive device 110 of the comparative example. Therefore, the width of the hypoid gear chamber can be reduced to the width W1 of the present embodiment compared with the width W102 of the comparative example. As described above, the size of the drive device 10 in the vehicle width direction can be suppressed while the reduction ratio is sufficiently increased.

[0047] In the drive device 10 of this embodiment, the side gears 28b and 68b are located in the region R1 between the transmission shafts 24 and 64. Therefore, interference between the outer wall of the hypoid gear chamber in the vehicle width direction and the side gears 28b and 68b can be suppressed. Thus, the width W1 of the hypoid gear chamber can be reduced.

[0048] like Figure 2 As shown in FIG. 2 , the front end portion 24e of the transmission shaft 24 is inserted into the center hole of the rotating shaft 20c. Figure 3 As shown in FIG. 1 , the front end portion 64e of the transmission shaft 64 is inserted into the center hole of the rotating shaft 60c. As a result, the protrusion amount of the transmission shafts 24 and 64 in the front-rear direction of the vehicle can be suppressed. Figure 1 As shown, the length L1 of the left auxiliary gear chamber 15L and the right auxiliary gear chamber 15R in the vehicle front-rear direction can be shortened. The volume of the drive device 10 can be reduced.

[0049] In the drive device 10 of the present embodiment, in the left drive system 90L, the lubrication and cooling of the rotating shaft 20c and the transmission shaft 24 can be performed by a common lubricating oil. Similarly, in the right drive system 90R, the lubrication and cooling of the rotating shaft 60c and the transmission shaft 64 can be performed by a common lubricating oil. The lubricating oil can be circulated efficiently.

[0050] Although the implementation methods have been described in detail above, these are merely examples and do not limit the scope of the protection requested. The technology described in the claims includes inventions after various modifications and changes to the specific examples illustrated above. The technical elements described in this specification or the drawings are elements that exert technical practicality alone or in various combinations, and are not limited to the combinations described in the technical solutions at the time of application. In addition, the technology illustrated in this specification or the drawings achieves multiple purposes at the same time, and achieving one of the purposes itself has technical practicality.

[0051] Modifications

[0052] The transmission shafts 24 and 64 can be located at any position as long as they are located in the region R2 between the secondary shafts 23 and 63. For example, in a plan view, the transmission shaft 24 of the left drive system 90L can be arranged between the rotating shaft 20c and the secondary shaft 23. In addition, the transmission shaft 64 of the right drive system 90R can be arranged between the rotating shaft 60c and the secondary shaft 63. As a result, the length L1 of the secondary gear chamber in the vehicle front-rear direction can be shortened.

[0053] The rotating shafts 20c and 60c are not limited to the configuration in which a plurality of shafts are fitted together, and may be, for example, a single shaft.

[0054] The front end portions of the transmission shafts 24 and 64 may not be inserted into the center holes of the rotation shafts 20c and 60c. In this case, the front end portions of the transmission shafts 24 and 64 may be separated from the rear end portions of the rotation shafts 20c and 60c.

[0055] The rear ends of the rotating shafts 20 c and 60 c may be respectively inserted into the respective center holes of the front end portions of the transmission shafts 24 and 64 .

[0056] The present invention is not limited to the structure having two independent left drive systems 90L and right drive systems 90R. The technology of the present specification can also be applied to a structure using a common drive system to drive the left and right wheels.

[0057] The hypoid gears 28 and 68 may not be provided. In this case, the rotation shafts 20c and 60c may extend in the width direction of the vehicle.

[0058] The rotating shaft 20c is an example of a first rotating shaft. The rotating shaft 60c is an example of a second rotating shaft. The sub-gear 21 is an example of a first sub-gear. The sub-shaft 23 is an example of a first sub-shaft. The sub-gear 61 is an example of a second sub-gear. The sub-shaft 63 is an example of a second sub-shaft. The sub-gear 22 is an example of a third sub-gear. The transmission shaft 24 is an example of a first transmission shaft. The sub-gear 62 is an example of a fourth sub-gear. The transmission shaft 64 is an example of a second transmission shaft. The hypoid gear 28 is an example of a first hypoid gear. The drive shaft 27 is an example of a first drive shaft. The hypoid gear 68 is an example of a second hypoid gear. The drive shaft 67 is an example of a second drive shaft. The oil seal 26 is an example of a first oil seal. The oil seal 66 is an example of a second oil seal.

Claims

1. A driving device for a vehicle, wherein: have: A first motor having a first rotating shaft extending in the front-rear direction of the vehicle; A second motor having a second rotating shaft extending in the front-rear direction of the vehicle; a first secondary shaft, arranged in parallel with the first rotating shaft and connected to the first rotating shaft via a first secondary gear; a second secondary shaft arranged in parallel with the second rotating shaft and connected to the second rotating shaft via a second secondary gear; a first transmission shaft arranged in parallel with the first secondary shaft and connected to the first secondary shaft via a third secondary gear; a second transmission shaft arranged in parallel with the second secondary shaft and connected to the second secondary shaft via a fourth secondary gear; A first drive shaft extending 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 left wheel; as well as The second drive shaft 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 right wheel. When looking down at the vehicle in the up-down direction, The first rotation axis and the second rotation axis are located between the first auxiliary axis and the second auxiliary axis in the vehicle width direction of the vehicle. The first propeller shaft and the second propeller shaft are located between the first counter shaft and the second counter shaft in a vehicle width direction of the vehicle.

2. The driving device according to claim 1, wherein: The first rotating shaft and the first transmission shaft are coaxially located. The second rotating shaft and the second transmission shaft are coaxially located.

3. The driving device according to claim 2, wherein: The first rotating shaft and the second rotating shaft are hollow, The first transmission shaft has one end inserted into the first rotating shaft. The second transmission shaft includes one end inserted into the second rotating shaft.

4. The driving device according to claim 3, wherein: The first transmission shaft and the second transmission shaft are hollow, The driving device also has: a first oil seal for sealing between the outer circumferential surface of the first transmission shaft and the inner circumferential surface of the first rotating shaft; and The second oil seal seals the outer circumference of the second transmission shaft and the inner circumference of the second rotating shaft. A first oil passage is formed by the first rotating shaft and the first transmission shaft. A second oil passage is formed by the second rotating shaft and the second transmission shaft.

5. The driving device according to claim 1, wherein: The first hypoid gear includes a first drive gear fixed to the first transmission shaft and a first side gear fixed to the first drive shaft. The second hypoid gear includes a second drive gear fixed to the second transmission shaft and a second side gear fixed to the second drive shaft. When the vehicle is viewed in a top-down direction, the first side gear and the second side gear are located between the first transmission shaft and the second transmission shaft in a vehicle width direction of the vehicle.

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