Drive device

Abstract

To provide a drive device for a vehicle.SOLUTION: A drive device includes a first motor. The drive device includes a first rotation shaft integrally rotating with a rotor of the first motor. The drive device includes a first counter shaft arranged parallel with the first rotation shaft and connected to the first rotation shaft via a first counter gear. The drive device includes first transmission shaft arranged coaxially with the first rotation shaft and connected to the first counter shaft via a second counter gear. The first rotation shaft and the first transmission shaft form a series of oil passages therein.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Patent Document 1 discloses a drive device for a vehicle that includes a motor and various gears. The motor and the various gears are lubricated by separate oil passages. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-178520 A Summary of the Invention [Problem to be solved by the invention]

[0004] Since the motor and the counter gear are lubricated by separate oil passages, the total length of the oil passages may become long, which may result in reduced lubrication efficiency. [Means for solving the problem]

[0005] The drive device disclosed in this specification is a drive device for a vehicle. The drive device includes a first motor. The drive device includes a first rotating shaft that rotates integrally with a rotor of the first motor. The drive device includes a first counter shaft that is arranged parallel to the first rotating shaft and connected to the first rotating shaft via a first counter gear. The drive device includes a first transmission shaft that is arranged coaxially with the first rotating shaft and connected to the first counter shaft via a second counter gear. The first rotating shaft and the first transmission shaft form a series of oil passages therein.

[0006] The counter gear includes a pair of gears that mesh with each other. In the above structure, a common oil passage can be formed by the first rotating shaft and the first transmission shaft. The common oil passage can be used to supply lubricating oil to the first motor, the first counter gear, and the second counter gear. The total length of the oil passage can be reduced, thereby improving lubrication efficiency. [Brief description of the drawings]

[0007] [Figure 1] 1 is a diagram showing a schematic configuration of a drive device 10. FIG. [Diagram 2] FIG. 4 is an enlarged cross-sectional view of the left drive system 90L. [Diagram 3] FIG. 4 is an enlarged cross-sectional view of the right drive system 90R. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The following are additional features of the drive device disclosed in this specification:

[0009] One end of one of the first rotating shaft and the first transmission shaft may be inserted inside the other of the first rotating shaft and the first transmission shaft.

[0010] According to the above configuration, a continuous oil passage can be formed by the first rotating shaft and the first transmission shaft.

[0011] The first rotatable shaft may include a first oil hole extending from the oil passage to an outer circumferential surface of the first rotatable shaft.

[0012] According to the above configuration, a portion of the lubricant flowing through the oil passage inside the first rotating shaft can be supplied to the first counter gear via the first oil hole, making it possible to appropriately lubricate the first counter gear.

[0013] The first transmission shaft may include a second oil hole extending from the oil passage to the outer circumferential surface of the first transmission shaft.

[0014] According to the above configuration, a portion of the lubricant flowing through the oil passage inside the first transmission shaft can be supplied to the second counter gear via the second oil hole, making it possible to appropriately lubricate the second counter gear.

[0015] The first rotatable shaft may include a first motor shaft, a portion of which is located within the first motor. The first rotatable shaft may include a first intermediate shaft, which is coaxially disposed with the first motor shaft and is fixed to the first motor shaft. The first oil hole may be disposed in the first intermediate shaft.

[0016] According to the above configuration, a portion 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.

[0017] The drive device may include a second motor. The drive device may include a second rotating shaft that rotates integrally with the rotor of the second motor. The second rotating shaft may extend in the front-rear direction of the vehicle and be arranged parallel to the first rotating shaft. The drive device may include a second countershaft that is arranged parallel to the second rotating shaft and connected to the second rotating shaft via a third counter gear. The drive device may include a second transmission shaft that is arranged coaxially with the second rotating shaft and connected to the second countershaft via a fourth counter gear. The drive device may include 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 include 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 form a series of oil passages therein.

[0018] According to the above configuration, it is possible to provide two independent drive systems for driving the left and right wheels, respectively. Each of the two drive systems can have an oil passage formed by a rotating shaft and a transmission shaft. In a drive unit having two independent drive systems, it is possible to reduce the total length of the oil passage. EXAMPLES

[0019] (Schematic configuration of drive device 10) Fig. 1 shows a schematic configuration of a drive device 10 of this embodiment. Fig. 1 is a plan view seen from above the vehicle. In Fig. 1, the arrow FR indicates the front direction of the vehicle, the arrow RH indicates the right direction of the vehicle, and the arrow UP indicates the upper direction of the vehicle. The same is true in other drawings.

[0020] The drive unit 10 has a case 12. Inside the case 12, a left motor chamber 13L and a right motor chamber 13R, a left counter gear chamber 15L and a right counter gear chamber 15R, a left hypoid gear chamber 16L and a right hypoid gear chamber 16R are provided. Inside the left motor chamber 13L, the left counter gear chamber 15L, and the left hypoid gear chamber 16L, a left drive system 90L is arranged. Inside the right motor chamber 13R, the right counter gear chamber 15R, and the right hypoid gear chamber 16R, a right drive system 90R is arranged. The left drive system 90L and the right drive system 90R are symmetrical. Therefore, in the following, the left drive system 90L may be mainly described.

[0021] The left drive system 90L will be described. The left motor chamber 13L accommodates a first motor 20. The first motor 20 includes a rotating shaft 20c extending in the front-rear direction of the vehicle. The left counter gear chamber 15L accommodates a counter shaft 23 and a transmission shaft 24. The counter shaft 23 is disposed parallel to the rotating shaft 20c. The counter shaft 23 is connected to the rotating shaft 20c via a counter gear 21. The counter gear 21 includes a gear 21a fixed to the rotating shaft 20c and a gear 21b fixed to the counter shaft 23.

[0022] The transmission shaft 24 is disposed parallel to the counter shaft 23 and is positioned coaxially with the rotating shaft 20c. The transmission shaft 24 is connected to the counter shaft 23 via a 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.

[0023] 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 inside of the vehicle 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 outside of the vehicle is connected to the left rear wheel 92.

[0024] The right drive system 90R will be described. The right motor chamber 13R accommodates a second motor 60. The second motor 60 includes a rotating shaft 60c extending in the front-rear direction of the vehicle. The right counter gear chamber 15R accommodates a counter shaft 63 and a transmission shaft 64. The counter shaft 63 is disposed parallel to the rotating shaft 60c. The counter shaft 63 is connected to the rotating shaft 60c via a counter gear 61. The counter gear 61 includes a gear 61a fixed to the rotating shaft 60c and a gear 61b fixed to the counter shaft 63.

[0025] The transmission shaft 64 is disposed in parallel to the counter shaft 63 and is coaxial with the rotating shaft 60c. The transmission shaft 64 is connected to the counter shaft 63 via a 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.

[0026] 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 inside of the vehicle 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 outside of the vehicle is connected to the right rear wheel 93.

[0027] (Location) 1, the region between the countershafts 23 and 63 in the vehicle width direction is defined as region R2. The rotating shafts 20c and 60c are located within region R2. The transmission shafts 24 and 64 are also located within region R2.

[0028] 1, in relation to the width direction of the vehicle, a region existing between the transmission shafts 24 and 64 is defined as a region R1. The side gears 28b and 68b are located within the region R1.

[0029] The width in the vehicle width direction of the case 12 that defines the left hypoid gear chamber 16L and the right hypoid gear chamber 16R is defined as width W1. The width in the vehicle width direction of the case 12 that defines the left counter gear chamber 15L and the right counter gear chamber 15R is defined as width W2. Width W1 is smaller than width W2.

[0030] (Example of a specific configuration for the left drive system 90L) A specific configuration example of the left drive system 90L will be described with reference to FIG. 2. FIG. 2 is an enlarged cross-sectional view of the left drive system 90L. The first motor 20 has a rotor 20a and a stator 20b. The stator 20b is disposed 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 part of the motor shaft 20c-1 is located inside the first motor 20. The rear end of the motor shaft 20c-1 is inserted into the tip of the intermediate shaft 20c-2. The motor shaft 20c-1 is fixed to the intermediate shaft 20c-2 by a spline engagement.

[0031] The countershaft 23 and the transmission shaft 24 are rotatably supported by bearings provided in the case 12. The transmission shaft 24 is disposed 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 an extension of the central axis of the rotating shaft 20c. The front end 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 circumferential surface of the transmission shaft 24 and the inner circumferential surface of the rotating shaft 20c is sealed by an oil seal 26.

[0032] 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 circumferential surface of the transmission shaft 24 and the inner circumferential surface of the through hole 18L is sealed by an oil seal 25.

[0033] The drive unit 10 has an oil circulation passage 35. An oil pump 30 is provided in the oil circulation passage 35. The upstream end of the oil circulation passage 35 is connected to the oil suction port 34. The oil suction port 34 is disposed 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 is formed by the central hole of the rotating shaft 20c (see the dotted arrow). The downstream end of the oil circulation passage 35 is connected to the front end of the shaft oil passage 36.

[0034] 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.

[0035] A shaft oil passage 38 is provided inside the transmission shaft 24, extending along its central axis (see dotted arrow). The front end of the shaft oil passage 38 is connected to the shaft oil passage 36. That is, the shaft oil passage 36 of the rotating shaft 20c and the shaft oil passage 38 of the transmission shaft 24 form a common oil passage. A plurality of second oil holes 44 are provided in the transmission shaft 24. The second oil holes 44 extend from the shaft oil passage 38 to the outer circumferential surface of the transmission shaft 24.

[0036] During operation of the first motor 20, the oil pump 30 operates. When the oil pump 30 operates, the lubricating oil stored in the bottom of the left counter gear chamber 15L is supplied to the shaft oil passage 36 in the rotating shaft 20c through the oil suction port 34 and the oil circulation oil passage 35. The lubricating oil flows rearward through the shaft oil passage 36. The first motor 20 is cooled by the lubricating oil flowing through 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.

[0037] The lubricating oil that has flowed through the shaft oil passage 36 to the rear end flows into the shaft oil passage 38 in the transmission shaft 24. A part of the lubricating oil in the shaft oil passage 38 is discharged from the second oil hole 44. As indicated by the dotted arrow A12, the counter gear 22 is lubricated and cooled by the lubricating oil discharged from the second oil hole 44.

[0038] (Example of the specific configuration of the right drive system 90R) A specific configuration example of the right drive system 90R will be described with reference to Fig. 3. Fig. 3 is an enlarged cross-sectional view of the right drive system 90R. The right drive system 90R in Fig. 3 is bilaterally symmetrical with the left drive system 90L in Fig. 2. Therefore, the configuration of the right drive system 90R is similar to the configuration of the left drive system 90L described above.

[0039] That is, the right drive system 90R includes the second motor 60, the motor shaft 60c-1, the intermediate shaft 60c-2, the counter gears 61 and 62, the counter shaft 63, the transmission shaft 64, the oil seals 65 and 66, the drive shaft 67, and the hypoid gear 68. The right drive system 90R also includes the oil pump 70, the oil suction port 74, the oil circulation oil passage 75, the shaft oil passages 76 and 78, the motor oil hole 80, the first oil hole 82, and the second oil hole 84. The counter gear 61 is lubricated and cooled by the lubricating oil discharged from the first oil hole 82 (see the dotted arrow A21). The counter gear 62 is lubricated and cooled by the lubricating oil discharged from the second oil hole 84 (see the dotted arrow A22). The specific contents of each member of the right drive system 90R are the same as those of the left drive system 90L described above, so detailed explanations will be omitted.

[0040] (effect) In the left drive system 90L of the drive unit 10 of this embodiment, a common oil passage can be formed by the shaft oil passage 36 of the rotating shaft 20c and the shaft oil passage 38 of the transmission shaft 24. That is, lubricating oil can be supplied to the shaft oil passage 38 via the shaft oil passage 36. This allows lubricating oil to be supplied to the first motor 20 and the counter gears 21 and 22 using a common oil passage. Compared to the case where the first motor 20 and the counter gears 21 and 22 are lubricated using separate oil passages, the total length of the oil passages can be reduced. This makes it possible to improve lubrication efficiency.

[0041] Similarly, in the right drive system 90R of the drive unit 10 of this embodiment, a common oil passage can be formed by the shaft oil passage 76 of the rotating shaft 60c and the shaft oil passage 78 of the transmission shaft 64. Then, using the common oil passage, lubricating oil can be supplied to the second motor 60 and the counter gears 61 and 62. Since the total length of the oil passages can be reduced, it is possible to improve lubrication efficiency.

[0042] Although the embodiments have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples exemplified above. The technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or drawings achieves multiple objectives simultaneously, and achieving one of the objectives itself has technical utility.

[0043] (Modification) The transmission shafts 24 and 64 may be located anywhere within the region R2 between the countershafts 23 and 63. For example, in a top view, the transmission shaft 24 of the left drive system 90L may be located between the rotating shaft 20c and the countershaft 23. Also, the transmission shaft 64 of the right drive system 90R may be located between the rotating shaft 60c and the countershaft 63. This makes it possible to reduce the length L1 of the counter gear chamber in the vehicle front-rear direction.

[0044] Each of the rotating shafts 20c and 60c is not limited to a configuration in which a plurality of shafts are fitted together, and may be, for example, a single shaft.

[0045] The front end portions of the transmission shafts 24 and 64 may not be inserted into the central holes of the rotating shafts 20c and 60c. In this case, the front end portions of the transmission shafts 24 and 64 may be spaced apart from the rear end portions of the rotating shafts 20c and 60c.

[0046] The rear ends of the rotary shafts 20c and 60c may each be inserted into a central hole in the front end of the transmission shafts 24 and 64, respectively.

[0047] The present invention is not limited to a configuration having two independent left and right drive systems 90L and 90R. The technology of this specification can also be applied to a configuration in which one common drive system is used to drive the left and right wheels.

[0048] It is also possible to adopt a configuration that does not include the hypoid gears 28 and 68. In this case, the rotating shafts 20c and 60c may extend in the width direction of the vehicle.

[0049] 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. [Explanation of symbols]

[0050] 10: Drive device 20: First motor 20c, 60c: Rotating shaft 21, 22, 61, 62: Counter gear 23, 63: Counter shaft 24, 64: Transmission shaft 27, 67: Drive shaft 28, 68: Hypoid gear 36, 38, 76, 78: Shaft oil passage 42, 82: First oil hole 44, 84: Second oil hole 60: Second motor

Claims

1. A drive device for a vehicle, comprising: A first motor; a first rotating shaft that rotates integrally with a rotor of the first motor; a first counter shaft arranged parallel to the first rotating shaft and connected to the first rotating shaft via a first counter gear; a first transmission shaft arranged coaxially with the first rotating shaft and connected to the first counter shaft via a second counter gear; Equipped with A drive device, wherein the first rotating shaft and the first transmission shaft form a series of oil passages therein.

2. The drive device according to claim 1 , wherein one end of one of the first rotating shaft and the first transmission shaft is inserted inside the other of the first rotating shaft and the first transmission shaft.

3. The drive device according to claim 2 , wherein the first rotating shaft has a first oil hole extending from the oil passage to an outer circumferential surface of the first rotating shaft.

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

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

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