Drive device

Abstract

To provide a driving device for a vehicle.SOLUTION: A drive device for a vehicle includes a motor including a motor shaft, a motor case accommodating the motor, a first case accommodating a gear unit mechanically connected to the motor, and a second case accommodating a power conversion unit electrically connected to the motor. The first case and the second case are fixed to one side of the motor case in an axial direction of the motor shaft. The central axis of the motor shaft is covered by the first case and the second case in the axial direction of the motor shaft.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] The vehicle drive device disclosed in Patent Document 1 has a configuration in which a motor, a gear unit, and a power conversion unit are integrated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-24489 Summary of the Invention [Problem to be solved by the invention]

[0004] In an integrated configuration of a motor, gear unit, and power conversion unit, noise can be a problem, particularly noise transmitted through the motor shaft and emitted from the shaft end of the motor shaft. [Means for solving the problem]

[0005] The present specification discloses a vehicle drive device that includes a motor having a motor shaft, a motor case that houses the motor, a first case that houses a gear unit mechanically connected to the motor, and a second case that houses a power conversion unit electrically connected to the motor. The first and second cases are fixed to one side of the motor case in the axial direction of the motor shaft. The central axis of the motor shaft is covered by the first and second cases in the axial direction of the motor shaft.

[0006] According to the above configuration, the central axis of the motor shaft can be covered by the first case and the second case in the axial direction of the motor shaft, making it possible to suppress noise emitted from the shaft end of the motor shaft. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a cross-sectional view showing a schematic configuration of a driving device 1. FIG. [Figure 2] FIG. 2 is a perspective view of the drive device 1. [Figure 3] FIG. 2 is an exploded plan view of the driving device 1. [Figure 4] FIG. 2 is a perspective view of a driving device 201. [Figure 5] FIG. 2 is an exploded plan view of the driving device 201. [Figure 6] FIG. 2 is a cross-sectional view showing a schematic configuration of a driving device 301. [Figure 7] FIG. 4 is a perspective view of a driving device 401. DETAILED DESCRIPTION OF THE INVENTION

[0008] The motor shaft may have an end face facing the first case, and the entire end face of the motor shaft may be covered by the first case and the second case in the axial direction of the motor shaft.

[0009] According to the above configuration, it is possible to suppress noise emitted from the vicinity of the end face of the motor shaft.

[0010] The motor may further include a first gear attached to the motor shaft and a second gear meshing with the first gear. The meshing point between the first gear and the second gear may be covered by the first case and the second case in the axial direction of the motor shaft.

[0011] According to the above configuration, it is possible to suppress noise emitted from the meshing point.

[0012] The transmission may further include a countershaft having a second gear attached thereto and disposed parallel to the motor shaft. The countershaft may have an end face facing the first case. The end face of the motor shaft may protrude less in the axial direction than the end face of the countershaft.

[0013] According to the above configuration, an additional space can be created in the second case in the region adjacent to the end face of the countershaft.

[0014] At least a portion of the periphery of the second case may be fixed onto the outer surface of the first case in a liquid-tight manner.

[0015] According to the above configuration, it is possible to prevent liquid and the like from entering the second case.

[0016] In the axial direction of the motor shaft, at least a portion of the second case may cover at least a portion of the first case with a space therebetween, and wiring electrically connected to the power conversion unit may be arranged in the space.

[0017] According to the above configuration, the space between the first case and the second case can be effectively utilized, and therefore the size of the drive device can be reduced.

[0018] The power conversion unit may include a first component including an inverter and a second component that is an electronic component electrically connected to the inverter, and wiring may connect the first component and the second component to each other.

[0019] According to the above configuration, it is possible to increase the degree of freedom in assembling the power conversion unit.

[0020] At least a portion of the second case may cover at least a portion of the first case with a space therebetween, and in the space, at least one of the first case and the second case may be provided with a soundproof structure.

[0021] According to the above configuration, the space between the first case and the second case can be effectively utilized, so that it is possible to enhance the noise suppression effect while suppressing the size of the drive device.

[0022] The second case may have a mount bracket that is attached to the vehicle, and at least a portion of the mount bracket may overlap the motor shaft in the axial direction of the motor shaft.

[0023] According to the above configuration, the mount bracket can also function as a soundproofing portion for suppressing noise, thereby enhancing the noise suppression effect.

[0024] The second case may have a low-rigidity portion and a high-rigidity portion having higher rigidity than the low-rigidity portion. A mount bracket may protrude from the high-rigidity portion. The high-rigidity portion may cover a central axis of the motor shaft in the axial direction of the motor shaft.

[0025] According to the above configuration, the high-rigidity portion can also function as a sound-insulating portion for suppressing noise, thereby enhancing the noise suppression effect.

[0026] The first case may include a first flange extending along the outer periphery of the first case and fixed to the motor case by some of the fastening members. The second case may include a second flange extending along the outer periphery of the second case and fixed to the motor case by some of the fastening members. The first flange and the second flange may be fixed to the motor case independently.

[0027] The first case and the second case may be fastened to the motor case by a plurality of fastening members. The plurality of fastening members may include at least one common fastening member that fastens the first case and the second case together to the motor case. The second case may be disposed on top of the first case at the location of the at least one common fastening member.

[0028] According to the above configuration, the total number of fastening members required can be reduced. Because the total number of fastening members can be reduced, the space required to arrange the fastening members can be reduced. This makes it possible to ensure the capacity of the first case and the second case, while also miniaturizing the size of the drive device.

[0029] The first case may include a first flange extending along the outer periphery of the first case and fixed to the motor case by some of the fastening members. The second case may include a second flange extending along the outer periphery of the second case and fixed to the motor case by some of the fastening members. A portion of the first flange may have an overlapping section located between the motor case and the second flange. The at least one common fastening member may include at least one first common fastening member located in the overlapping section.

[0030] According to the above configuration, by using the first common fastening member in the overlapping section of the first flange and the second flange, it is possible to reduce the total number of fastening members.

[0031] The first case may include a first flange extending along the outer periphery of the first case and fixed to the motor case by a plurality of fastening members, and the second case may cover at least a portion of the first flange. [Example]

[0032] (Configuration of drive unit 1) FIG. 1 is a cross-sectional view showing the schematic configuration of a drive unit 1 of this embodiment. The drive unit 1 is an integrated device that houses a motor, a gear unit, and a power conversion unit for controlling the motor in the same casing. The directions FR, RH, and UP indicate the orientation of the drive unit 1 with respect to the vehicle (electric vehicle) when the drive unit 1 is mounted on the vehicle. The direction FR indicates the front in the longitudinal direction of the vehicle. The direction RH indicates the right in the lateral direction (or width direction) of the vehicle. The direction UP indicates the upward direction in the vertical direction of the vehicle. This is also true for other drawings. Note that in FIG. 1, multiple shafts (motor shaft 43, countershaft 52, drive shafts 57L and 57R) are shown expanded so that they are positioned on the same plane.

[0033] The drive device 1 is controlled by a control device 2. The control device 2 includes a CPU, RAM, ROM, an input / output interface, etc. The control device 2 is connected to a power conversion unit 21 and the like by signal lines (not shown).

[0034] The drive unit 1 includes a casing 10. The casing 10 includes a first case 11, a second case 12, and a motor case 13. The first case 11, the second case 12, and the motor case 13 may be cast metal.

[0035] The motor case 13 includes a motor compartment 31. The motor compartment 31 houses a motor 40. In other words, the motor case 13 houses the motor 40. The motor 40 includes a stator 41, a rotor 42, and a motor shaft 43. The stator 41 has a cylindrical shape. The rotor 42 is rotatably disposed inside the stator 41. The motor shaft 43 has a central axis CA.

[0036] The motor case 13 also has an opposing surface 13s that faces the first case 11 and the second case 12. A motor shaft hole MH and a drive shaft hole DH1 are formed in the opposing surface 13s. The motor shaft 43 passes through the motor shaft hole MH. The left drive shaft 57L passes through the drive shaft hole DH1.

[0037] The first case 11 has a box shape with one open side. The first case 11 is fastened to the opposing surface 13s so that the open side is closed by the opposing surface 13s. The manner of fastening will be described later. As a result, a first space SP1 is defined between the motor case 13 and the first case 11. The gear unit 50 is stored in the first space SP1. In other words, the first case 11 houses the gear unit 50.

[0038] The gear unit 50 includes a shaft gear 51, a countershaft 52, a first counter gear 53, a second counter gear 54, a ring gear 55, and a differential gear 56. The shaft gear 51 is attached to the motor shaft 43, thereby mechanically connecting the gear unit 50 and the motor 40. The countershaft 52 is attached with a first counter gear 53 and a second counter gear 54. The first counter gear 53 meshes with the shaft gear 51. The second counter gear 54 meshes with the ring gear 55. The ring gear 55 is attached to the differential gear 56. A pair of drive shafts 57L and 57R extend from the differential gear 56 in the vehicle width direction. The drive shaft 57R passes through a drive shaft hole DH2 formed in the first case 11. A reservoir 58 is provided at the bottom of the first space SP1. Oil 57 is stored in the reservoir 58. A part of the gear unit 50 is immersed in oil 57 stored in a reservoir 58 .

[0039] The second case 12 has a box shape with one open side. The second case 12 is fastened to the opposing surface 13s so that the opening is covered by the opposing surface 13s. The manner of fastening will be described later. As a result, a second space SP2 is defined between the motor case 13 and the second case 12. The power conversion unit 21 is stored in the second space SP2. In other words, the second case 12 houses the power conversion unit 21. The power conversion unit 21 is a component for controlling the power supplied to the motor 40 and the generated power. Examples of components included in the power conversion unit 21 include an inverter and a converter. The power conversion unit 21 is electrically connected to the motor 40 by a bus bar 22.

[0040] (Configuration of casing 10) Fig. 2 shows a perspective view of the drive unit 1. In Fig. 2, the second case 12 and the power conversion unit 21 are removed. The position of the end surface 43e of the motor shaft 43 is indicated by a dotted line. Fig. 3 shows an exploded plan view of the drive unit 1.

[0041] The first case 11 includes a first flange 11f extending along the outer periphery of the first case 11. In FIG. 3, the first flange 11f is formed in the overlapping section OS and section SS. The second case 12 includes a second flange 12f extending along the outer periphery of the second case 12. The motor case 13 includes a motor case flange 13f extending along the outer periphery of the motor case 13. A plurality of fastening holes 11h are arranged in the first flange 11f. A plurality of fastening holes 12h are arranged in the second flange 12f. A plurality of fastening holes 13h are arranged in the motor case flange 13f and the opposing surface 13s. In this embodiment, the first flange 11f extends annularly along the outer periphery of the first case 11, and the second flange 12f extends annularly along the outer periphery of the second case 12, but this is not limiting. The first flange 11f and the second flange 12f only need to extend along at least the motor case flange 13f. That is, the first flange 11f and the second flange 12f do not have to be disposed in the opposing region where the first case 11 and the second case 12 face each other in the radial direction.

[0042] As shown in Fig. 3, a portion of the first flange 11f has an overlapping section OS. The overlapping section OS is a region where the second flange 12f overlaps the first flange 11f. In other words, in the overlapping section OS, the first flange 11f is located between the opposing surface 13s of the motor case 13 and the second flange 12f.

[0043] The first case 11 also has an extension 14 extending from end E1 to end E2 of the overlapping section OS. The extension 14 is a frame-shaped member extending along the outer edge of the second case 12. The extension 14 has the same thickness as the first flange 11f. The extension 14 is formed integrally with the first case 11. A plurality of fastening holes 14h are arranged in the extension 14. The first flange 11f and the extension 14, which are arranged in the overlapping section OS, form a base having a closed ring shape. An opening area OA is formed inside the ring-shaped base. The ring-shaped base is formed so as to overlap the second flange 12f by one circumference when the second case 12 is assembled. In other words, the ring-shaped base also functions as a spacer ring.

[0044] The first case 11 and the second case 12 are fastened to the motor case 13 by a plurality of bolts 60. The longitudinal direction of the plurality of bolts 60 is substantially parallel to the central axis CA of the motor shaft 43. More specifically, the plurality of bolts 60 includes at least one first common bolt 61 disposed in the overlapping section OS. In other words, the second case 12 is disposed above the first case 11 at the position of the first common bolt 61. In the overlapping section OS, the fastening hole 12h of the second flange 12f, the fastening hole 11h of the first flange 11f, and the fastening hole 13h of the motor case 13 are aligned. The first common bolt 61 passes through the fastening holes 12h and 11h and is inserted into the fastening hole 13h. This fastens the first case 11 and the second case 12 together to the motor case 13.

[0045] The bolts 60 also include at least one second common bolt 62 arranged in the extension section ES where the extension 14 is present. In the extension section ES, the second common bolt 62 passes through fastening holes 12h and 14h and is inserted into fastening hole 13h. This fastens the extension 14 and the second case 12 together to the motor case 13. In other words, the extension 14 is located between the motor case 13 and the second flange 12f.

[0046] Bolts 60 are arranged in section SS of the first flange 11f, which is a section other than the overlap section OS. In section SS, the bolts 60 pass through fastening holes 11h and are inserted into fastening holes 13h (see FIG. 2). This fastens the first case 11 to the motor case 13.

[0047] (Positional relationship between the first case 11, the second case 12 and the motor shaft 43) The first case 11 and the second case 12 are both fixed to an opposing surface 13s of the motor case 13. The opposing surface 13s is one surface of the motor case 13 in the central axis direction D2. In this embodiment, the first case 11 and the motor case 13 are fixed to each other so as to be in contact with each other by a plurality of bolts 60, but this is not limited to this. For example, an adhesive such as a liquid gasket (FIPG) may be interposed between the first case 11 and the motor case 13 to fix them. Similarly, an adhesive or the like may be interposed between the second case 12 and the first case 11 to fix them. The first case 11 has a height H1 in the vehicle width direction. The second case 12 has a height H2 in the vehicle width direction. The height H2 is greater than the height H1.

[0048] The first case 11 has a motor shaft region MR that houses the motor shaft 43 (see FIG. 2). The motor shaft region MR has a shape that protrudes in a direction perpendicular to the central axis CA. The motor shaft region MR has a width W1 in the direction perpendicular to the central axis CA, which is the vertical direction of the vehicle. It also has a height H1 in the direction of the central axis D2.

[0049] The second case 12 has an opening AP on its surface facing the front of the vehicle. The opening AP has a width W1 in the vertical direction of the vehicle, which is perpendicular to the central axis CA. It also has a height H1 in the direction of the central axis D2. That is, the opening AP has a shape and size corresponding to the motor shaft region MR. Therefore, by assembling the second case 12 on the first case 11, the motor shaft region MR of the first case 11 can be received within the opening AP of the second case 12. As a result, the first flange 11f (see region R1 in Figure 3) arranged along the motor shaft region MR is covered by the second case 12.

[0050] A second flange 12f is disposed around the opening AP. By assembling the second case 12 on the first case 11, the second flange 12f disposed along the opening AP can be tightly attached to the surface of the first case 11. The second flange 12f disposed along the opening AP has an upper surface section US that contacts the upper surface 11u of the first case 11. Fastening holes 12h2 are disposed in the upper surface section US. Fastening holes 11h2 are also disposed in the upper surface 11u of the first case 11. By inserting bolts 60 through the fastening holes 11h2 and 12h2, the second case 12 can be fastened to the upper surface 11u of the first case 11. This allows the second flange 12f formed along the opening AP to be fixed liquid-tightly to the outer surface of the first case 11. This makes it possible to prevent liquids and the like from entering the second case 12.

[0051] A cover region CR is formed in a portion of the upper surface 12u of the second case 12. The cover region CR is a region that covers the motor shaft region MR of the first case 11. As shown in FIG. 1, in the cover region CR, a space SPa is formed between the first case 11 and the second case 12. In other words, the cover region CR covers the motor shaft region MR of the first case 11 via the space SPa.

[0052] Furthermore, in the space SPa, a soundproof structure 12r is provided in an area corresponding to the cover area CR. The soundproof structure 12r is a structure having a noise suppression function. The soundproof structure 12r can be disposed on at least one of the inner surface of the second case 12 and the top surface of the first case 11. The soundproof structure 12r may have various structures. For example, it may be a rib formed integrally with the case. Alternatively, for example, a soundproof material such as rubber may be bonded. In this embodiment, the soundproof structure 12r is a rib structure formed on the inner surface of the second case 12.

[0053] (Structure of power conversion unit 21) As shown in FIG. 2, the power conversion unit 21 is divided into a first component 21_1 and a second component 21_2. The first component 21_1 is a component including an inverter. In other words, the first component 21_1 is a component connected to the bus bar 22. The second component 21_2 is an electronic component electrically connected to the inverter of the first component 21_1. The second component 21_2 may include, for example, at least one of various sensors, a DC-DC converter, a coil, and a capacitor. Examples of the various sensors include sensors that detect at least one of the voltage, current, and temperature in the power conversion unit 21.

[0054] The first component 21_1 and the second component 21_2 are electrically connected by a wiring 23. The wiring 23 may be a bus bar. As shown in FIG. 1, the wiring 23 is routed through the space SPa. This allows the space SPa to be used effectively, thereby making it possible to reduce the size of the drive device 1. Note that, as a modified example, another component may be further interposed between the first component 21_1 and the second component 21_2.

[0055] (effect) In the drive device 1 of this embodiment, the central axis CA of the motor shaft 43 is covered in the central axis direction D2 by the first case 11 and the second case 12. This makes it possible to suppress noise radiated from near the end face 43e of the motor shaft 43, compared to when the central axis CA is covered only by the first case 11.

[0056] Furthermore, in the drive device 1 of this embodiment, the entire end face 43e of the motor shaft 43 is covered in the central axis direction D2 by the first case 11 and the second case 12. This makes it possible to suppress noise emitted from the vicinity of the end face 43e of the motor shaft 43, compared to when the end face 43e is covered only by the first case 11.

[0057] The shaft gear 51 and the first counter gear 53 mesh at a meshing point MP (see FIG. 1). In the drive device 1 of this embodiment, the meshing point MP is covered by the first case 11 and the second case 12 in the central axis direction D2. This makes it possible to suppress noise emitted from the meshing point MP compared to when the meshing point MP is covered only by the first case 11.

[0058] In the drive unit 1 of this embodiment, the soundproofing structure 12r arranged in the space SPa can suppress radiated sound emitted from near the end face 43e of the motor shaft 43. Because the space SPa can be effectively used, it is possible to enhance the noise suppression effect while suppressing the size of the drive unit 1. [Example]

[0059] Example 2 differs from Example 1 in that first flange 11f and second flange 12f are each independently fixed to motor case 13. That is, second case 12 is fixed to first case 11 in Example 1, but is fixed to motor case 13 in Example 2. Portions common to Example 1 and Example 2 are denoted by the same reference numerals, and description thereof will be omitted.

[0060] Fig. 4 shows a perspective view of a drive device 201 of Example 2. Fig. 4 shows a state in which the second case 12, the first component 21_1, and the second component 21_2 are removed. Fig. 5 shows an exploded plan view of the drive device 201.

[0061] In the driving device 201 of the embodiment, the first flange 11f does not have an overlapping section OS. That is, the first flange 11f and the second flange 12f are fixed to the motor case 13 independently. In other words, the first flange 11f and the second flange 12f do not have a section where they are fastened together to the motor case flange 13f by the first common bolt 61. The first case 11 does not have an extension 14. As shown in FIG. 5, the opposing surface 13s of the motor case 13 has a first fixing surface MS1 to which the first case 11 is fixed and a second fixing surface MS2 to which the second case 12 is fixed. Then, a bolt 60 is inserted so as to pass through the fastening hole 12h of the second flange 12f and the fastening hole 13h of the motor case flange 13f. Furthermore, bolts 60 are inserted through the fastening holes 12h2 arranged in the upper surface section US of the second flange 12f and the fastening holes 11h2 arranged in the upper surface 11u of the first case 11.

[0062] This allows the second case 12 to be fixed to the motor case 13 so that the second case 12 covers the motor shaft region MR of the first case 11. Note that the effects obtained by the drive device 201 of the second embodiment are similar to those of the drive device 1 of the first embodiment, and therefore description thereof will be omitted. [Example]

[0063] The main difference between Example 3 and Example 1 is that the second case 12 includes a high-rigidity portion 12t and a pair of mount brackets 17. The same reference numerals are used to designate parts common to Example 1 and Example 3, and descriptions thereof will be omitted.

[0064] FIG. 6 shows a cross-sectional view of a drive unit 301 according to a third embodiment. FIG. 6 is a cross-sectional view taken at the same position as FIG. 1 of the first embodiment. The second case 12 includes a high-rigidity portion 12t and a low-rigidity portion. The high-rigidity portion 12t is a portion having a thickness T1. The low-rigidity portion is a portion having a thickness T2. The thickness T1 is thicker than the thickness T2. In other words, the high-rigidity portion 12t is a portion having higher rigidity than the low-rigidity portion. The low-rigidity portion is a portion of the second case 12 other than the high-rigidity portion 12t. Each of the pair of mount brackets 17 is disposed on the high-rigidity portion 12t so as to protrude from the high-rigidity portion 12t. The mount brackets 17 are portions for attaching the drive unit 301 to a vehicle. The mount brackets 17 may be formed integrally with the second case 12. By fixing the base of the mount bracket 17 to the high-rigidity portion 12t, the strength with which the drive unit 301 is attached to the vehicle can be increased.

[0065] The central axis CA of the motor shaft 43, the entire end face 43e of the motor shaft 43, and the meshing point MP are covered by the high-rigidity portion 12t in the central axis direction D2. This allows the high-rigidity portion 12t to function as a sound-insulating portion for suppressing noise. This makes it possible to further enhance the noise suppression effect in accordance with the mass law and the rigidity law.

[0066] The countershaft 52 has an end face 52e facing the first case 11. The amount of protrusion of the end face 43e of the motor shaft 43 from the facing face 13s in the central axis direction D2 is smaller than the amount of protrusion of the end face 43e of the countershaft 52. This is because the motor shaft 43 has only one gear (shaft gear 51), while the countershaft 52 has two gears (first counter gear 53 and second counter gear 54). Therefore, the axial length of the countershaft 52 in the central axis direction D2 within the first case 11 is longer than that of the motor shaft 43. This allows an additional space SPc to be created within the second case 12 in the central axis direction D2 of the motor shaft 43. This makes it possible to ensure a sufficient capacity of the second case 12.

[0067] (Modification of Example 3) The high-rigidity portion 12t may have various structures. For example, the rigidity of the high-rigidity portion 12t may be increased by a rib. Alternatively, the rib of the soundproof structure 12r may also be used to increase the rigidity of the high-rigidity portion 12t.

[0068] 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 variations of 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. Furthermore, the technology exemplified in this specification or drawings simultaneously achieves multiple objectives, and achieving one of these objectives itself has technical utility.

[0069] (Variation) The motor shaft region MR may be covered by the second case 12 in various ways. For example, as shown in a drive device 401 in FIG. 7, the second case 12 may have a recessed portion RP instead of an opening AP. The recessed portion RP has a shape and size corresponding to the motor shaft region MR. Therefore, by assembling the second case 12 on the first case 11, the motor shaft region MR of the first case 11 can be received in the recessed portion RP of the second case 12. This allows a portion of the second case 12 to protrude over the motor shaft region MR. This protruding portion can then function as a cover region CR that covers the motor shaft region MR. In this manner, the second flanges 12f can all be arranged on the same plane, further improving the airtightness of the second case 12.

[0070] Various wirings can be arranged in the space SPa formed in the cover area CR. For example, cables connecting the power conversion unit 21 to external devices and various wire harnesses may be arranged in the space SPa.

[0071] The extension 14 may be a separate component from the first case 11.

[0072] The vehicle on which the drive device of this specification is installed is not limited to an electric vehicle. The drive device of this specification can be installed, for example, in a hybrid vehicle or a plug-in hybrid vehicle. In this case, the drive device of this specification may house multiple motors or a planetary gear mechanism in a casing. The drive device of this specification can also be applied to vehicles that use an electric motor for at least part of their driving, such as a fuel cell vehicle. [Explanation of symbols]

[0073] 1: Drive unit 10: Casing 11: First case 12: Second case 13: Motor case 40: Motor 43: Motor shaft 43e: End face 50: Gear unit CA: Central axis D2: Central axis direction

Claims

1. A drive device for a vehicle, a motor having a motor shaft; a motor case that houses the motor; a first case that houses a gear unit that is mechanically connected to the motor; a second case that houses a power conversion unit electrically connected to the motor; Equipped with the first case and the second case are fixed to one side of the motor case in the axial direction of the motor shaft, A drive device, wherein a central axis of the motor shaft is covered by the first case and the second case in the axial direction of the motor shaft.

2. the motor shaft has an end surface facing the first case, The drive device according to claim 1 , wherein the entire end surface of the motor shaft is covered by the first case and the second case in the axial direction of the motor shaft.

3. a first gear attached to the motor shaft; a second gear meshing with the first gear; Furthermore, 3. The drive device according to claim 2, wherein a meshing point between the first gear and the second gear is covered by the first case and the second case in the axial direction of the motor shaft.

4. a counter shaft to which the second gear is attached and which is disposed parallel to the motor shaft; the countershaft has an end surface facing the first case, The drive device according to claim 3 , wherein the end surface of the motor shaft protrudes less in the axial direction than the end surface of the countershaft.

5. The drive unit according to claim 1 , wherein at least a portion of the periphery of the second case is fixed onto the outer surface of the first case in a liquid-tight manner.

6. At least a portion of the second case covers at least a portion of the first case in the axial direction of the motor shaft, with a space therebetween; The drive device according to claim 5 , wherein a wiring electrically connected to the power conversion unit is disposed in the space.

7. the power conversion unit includes a first component including an inverter and a second component that is an electronic component electrically connected to the inverter, The drive device according to claim 6 , wherein the wiring connects the first component and the second component to each other.

8. At least a portion of the second case covers at least a portion of the first case with a space therebetween, The drive unit according to claim 1 , wherein in the space, at least one of the first case and the second case is provided with a soundproof structure.

9. the second case has a mount bracket that is attached to the vehicle, The drive device according to claim 1 , wherein at least a portion of the mounting bracket overlaps with the motor shaft in the axial direction of the motor shaft.

10. the second case has a low-rigidity portion and a high-rigidity portion having higher rigidity than the low-rigidity portion, the mount bracket protrudes from the high rigidity portion, The drive device according to claim 9 , wherein the high-rigidity portion covers the central axis of the motor shaft in the axial direction of the motor shaft.

11. the first case includes a first flange extending along an outer peripheral edge of the first case and fixed to the motor case by some of a plurality of fastening members; the second case includes a second flange extending along an outer peripheral edge of the second case and fixed to the motor case by some of the plurality of fastening members; The drive device according to claim 1 , wherein the first flange and the second flange are fixed to the motor case independently of each other.

12. the first case and the second case are fastened to the motor case by a plurality of fastening members, the plurality of fastening members include at least one common fastening member that fastens the first case and the second case together to the motor case, The drive unit according to claim 1 , wherein the second case is disposed above the first case at the location of the at least one common fastening member.

13. the first case includes a first flange extending along an outer peripheral edge of the first case and fixed to the motor case by some of the plurality of fastening members; the second case includes a second flange extending along an outer peripheral edge of the second case and fixed to the motor case by some of the plurality of fastening members; a portion of the first flange having an overlapping section positioned between the motor case and the second flange; The drive device according to claim 12 , wherein the at least one common fastening member includes at least one first common fastening member located in the overlapping section.

14. the first case includes a first flange extending along an outer peripheral edge of the first case and fixed to the motor case by a plurality of fastening members; The drive unit according to claim 1 , wherein the second case covers at least a portion of the first flange.

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