Drive device

Abstract

A drive device includes a motor, a motor housing, a first housing, and a second housing. The motor includes a motor shaft. The motor housing is configured to accommodate the motor. The first housing is configured to receive a gear unit mechanically connected to the motor. The second housing is configured to house a power conversion unit electrically connected to the motor. The first shell and the second shell are fixed to one side of the motor shell in the axial direction of the motor shaft. The central shaft of the motor shaft is covered by the first housing and the second housing in the axial direction of the motor shaft.

Description

Technical Field

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

[0002] The vehicle drive device disclosed in Japanese Patent Application Laid-Open No. 2014-24489 has a structure in which a motor, a gear unit, and a power conversion unit are integrated. Summary of the invention

[0003] In the vehicle drive device having an integrated structure of a motor, a gear unit, and a power conversion unit disclosed in Japanese Patent Application Laid-Open No. 2014-24489, noise may become a problem. In particular, noise transmitted through the motor shaft of the motor and emitted from the shaft end of the motor shaft may become a problem.

[0004] Therefore, this specification discloses a vehicle drive device in which noise does not pose a problem.

[0005] The present invention relates to a driving device for a vehicle having a motor, a motor housing, a first housing, and a second housing. The motor has a motor shaft. The motor housing is configured to accommodate the motor. The first housing is configured to accommodate a gear unit mechanically connected to the motor. The second housing is configured to accommodate a power conversion unit electrically connected to the motor. Moreover, the first housing and the second housing are fixed to one side of the motor housing in the axial direction of the motor shaft. The central axis of the motor shaft is covered by the first housing and the second housing in the axial direction of the motor shaft.

[0006] According to the driving device of the above-described embodiment, the central axis of the motor shaft can be covered by the first housing and the second housing in the axial direction of the motor shaft. Therefore, it is possible to suppress noise generated from the shaft end of the motor shaft.

[0007] In the drive device of the aspect of the present invention, the motor shaft may have a first end surface facing the first housing. The entire first end surface of the motor shaft may be covered by the first housing and the second housing in the axial direction of the motor shaft.

[0008] According to the driving device having the above-described structure, it is possible to suppress noise generated from the vicinity of the first end surface of the motor shaft.

[0009] The drive device having the above structure may further include a first gear mounted on 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 housing and the second housing in the axial direction of the motor shaft.

[0010] According to the driving device having the above-described structure, it is possible to suppress noise generated from the meshing point.

[0011] In the drive device of the above structure, a secondary shaft may also be provided, the secondary shaft is provided with a second gear and is arranged parallel to the motor shaft. The secondary shaft may also have a second end face facing the first housing. The protrusion amount of the first end face of the motor shaft in the axial direction may also be smaller than that of the second end face of the secondary shaft.

[0012] According to the drive device having the above-described structure, a space can be further created in the second housing in the region adjacent to the second end surface of the auxiliary shaft.

[0013] In the driving device according to the aspect of the present invention, at least a portion of the peripheral edge of the second housing may be fixed to the outer surface of the first housing in a liquid-tight manner.

[0014] According to the driving device having the above-described structure, it is possible to prevent liquid and the like from entering the second housing.

[0015] In the drive device having the above structure, in the axial direction of the motor shaft, at least a portion of the second housing may cover at least a portion of the first housing via the space. A wiring electrically connected to the power conversion unit may be arranged in the space.

[0016] According to the driving device having the above-described structure, the space formed in the second housing by the first housing and the second housing can be effectively utilized, so that the driving device can be miniaturized.

[0017] In the drive device having the above configuration, the power conversion unit may include a first component including an inverter and a second component as an electronic component electrically connected to the inverter. The first component and the second component may be connected to each other by wiring.

[0018] According to the driving device having the above-described structure, the degree of freedom in assembling the power conversion unit can be improved.

[0019] In the driving device of the aspect of the present invention, at least a portion of the second housing may cover at least a portion of the first housing via the space. In the space, at least one of the first housing and the second housing may be provided with a noise prevention structure.

[0020] According to the driving device having the above-described structure, the space formed in the second housing by the first housing and the second housing can be effectively utilized, so that the noise suppression effect can be improved while suppressing the volume of the driving device.

[0021] In the drive device according to the aspect of the present invention, the second housing may include a mounting bracket mounted on the vehicle. At least a portion of the mounting bracket may overlap the motor shaft in the axial direction of the motor shaft.

[0022] According to the driving device having the above-described structure, the mounting bracket can also function as a soundproofing unit for suppressing noise, thereby improving the noise suppression effect.

[0023] In the drive device of the structure as described above, the second housing may also have a low rigidity portion and a high rigidity portion having higher rigidity than the low rigidity portion. The mounting bracket may also protrude from the high rigidity portion. The high rigidity portion may also cover the central axis of the motor shaft in the axial direction of the motor shaft.

[0024] According to the driving device having the above-described structure, the high rigidity portion can also function as a sound insulating portion for suppressing noise, thereby improving the noise suppression effect.

[0025] In the drive device of the embodiment of the present invention, the first housing may also include a first flange extending along the outer periphery of the first housing and fixed to the motor housing by a part of the plurality of fastening members. The second housing may also include a second flange extending along the outer periphery of the second housing and fixed to the motor housing by a part of the plurality of fastening members. The first flange and the second flange may also be fixed to the motor housing independently.

[0026] In the drive device of the present invention, the first housing and the second housing may be fastened to the motor housing by a plurality of fastening members. The plurality of fastening members may also include at least one common fastening member for fastening the first housing and the second housing to the motor housing. The second housing may also be arranged on the first housing at the position of the at least one common fastening member.

[0027] According to the drive device of the structure as described above, the total required number of fastening members can be reduced. Since the total number of fastening members can be reduced, the space for configuring the fastening members can be reduced. The capacity of the first shell and the second shell can be ensured, and the volume of the drive device can be miniaturized.

[0028] In the drive device of the structure as described above, the first housing may also include a first flange extending along the outer periphery of the first housing and fixed to the motor housing by a part of the plurality of fastening members. The second housing may also include a second flange extending along the outer periphery of the second housing and fixed to the motor housing by a part of the plurality of fastening members. A part of the first flange may also have an overlapping section between the motor housing and the second flange. The at least one universal fastening member may also include at least one first universal fastening member located in the overlapping section.

[0029] According to the driving device having the above-described structure, by using the first common fastening member in the overlapping section between the first flange and the second flange, the total number of fastening members can be reduced.

[0030] In the drive device of the aspect of the present invention, the first housing may include a first flange extending along the outer periphery of the first housing and fixed to the motor housing by a plurality of fastening members. The second housing may cover at least a portion of the first flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which like reference numerals represent like parts, and in which:

[0032] Figure 1 It is a cross-sectional view showing a schematic structure of a driving device according to a first embodiment as an example of the present invention.

[0033] Figure 2 is a perspective view of the driving device.

[0034] Figure 3 is an exploded plan view of the drive device.

[0035] Figure 4 It is a perspective view of a driving device according to a second embodiment as an example of the present invention.

[0036] Figure 5 is an exploded plan view of the driving device according to the second embodiment.

[0037] Figure 6 It is a cross-sectional view showing a schematic structure of a driving device according to a third embodiment as an example of the present invention.

[0038] Figure 7 It is a perspective view of a driving device according to a modified example of the embodiment of the present invention. DETAILED DESCRIPTION

[0039] First, the structure of the driving device 1 according to the first embodiment of the present invention will be described. Figure 1 : is a cross-sectional view showing the schematic structure of the drive device 1 of the first embodiment. The drive device 1 is an integrated device that accommodates a motor, a gear unit, and a power conversion unit for controlling the motor in the same housing. The directions FR, RH, and UP indicate the orientation of the drive device 1 relative to the vehicle when the drive device 1 is mounted on the vehicle (electric vehicle). The direction FR indicates the front in the front-to-back direction of the vehicle. The direction RH indicates the right in the left-right direction (or width direction) of the vehicle. The direction UP indicates the top in the up-down direction of the vehicle. The same is true in the other drawings. In addition, Figure 1 In FIG. 1 , a plurality of shafts (the motor shaft 43 , the auxiliary shaft 52 , the drive shaft 57L, and the drive shaft 57R) are shown unfolded so as to be located in the same plane.

[0040] The driving device 1 is controlled by a control device 2. The control device 2 includes a CPU, a RAM, a ROM, an input / output interface, etc. The control device 2 is connected to a power conversion unit 21 and the like via a signal line (not shown).

[0041] The driving device 1 includes a housing 10. The housing 10 includes a first housing 11, a second housing 12, and a motor housing 13. The first housing 11, the second housing 12, and the motor housing 13 may be cast parts.

[0042] The motor housing 13 includes a motor compartment 31. The motor compartment 31 contains the motor 40. In other words, the motor housing 13 accommodates 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 arranged inside the stator 41. The motor shaft 43 includes a central axis CA.

[0043] The motor case 13 has a facing surface 13s facing the first case 11 and the second case 12. The facing surface 13s is formed with a motor shaft hole MH and a drive shaft hole DH1. The motor shaft 43 passes through the motor shaft hole MH. The left drive shaft 57L passes through the drive shaft hole DH1.

[0044] The first housing 11 has a box shape with one side open. The first housing 11 is fastened to the facing surface 13s in a manner that the opening side is blocked by the facing surface 13s. In addition, the fastening method will be described later. Thus, the first space SP1 is divided in the first housing 11 by the motor housing 13 and the first housing 11. The gear unit 50 is accommodated in the first space SP1. In other words, the first housing 11 accommodates the gear unit 50.

[0045] The gear unit 50 includes a shaft gear 51, a countershaft 52, a first countershaft gear 53, a second countershaft gear 54, a ring gear 55, and a differential gear 56. The shaft gear 51 is mounted on the motor shaft 43. Thus, the gear unit 50 is mechanically connected to the motor 40. The first countershaft gear 53 and the second countershaft gear 54 are mounted on the countershaft 52. The first countershaft gear 53 meshes with the shaft gear 51. The shaft gear 51 is an example of the "first gear" of the present invention. The first countershaft gear 53 is an example of the "second gear" of the present invention. The second countershaft gear 54 meshes with the ring gear 55. The ring gear 55 is mounted on the differential gear 56. A pair of drive shafts 57L and a drive shaft 57R extend in the vehicle width direction from the differential gear 56. The drive shaft 57R penetrates the drive shaft hole DH2 formed in the first housing 11. A storage portion 58 is provided at the lower portion of the first space SP1. Oil 57 is stored in the storage portion 58. A portion of the gear unit 50 is immersed in oil 57 stored in a storage portion 58 .

[0046] The second housing 12 has a box shape with one side open. The second housing 12 is fastened to the facing surface 13s in such a manner that the opening surface is blocked by the facing surface 13s. In addition, the fastening method will be described later. Thus, a second space SP2 is divided in the second housing 12 by the motor housing 13 and the second housing 12. The power conversion unit 21 is accommodated in the second space SP2. In other words, the second housing 12 accommodates the power conversion unit 21. The power conversion unit 21 is a part for controlling the power supplied to the motor 40 and the power generated. As an example of the components included in the power conversion unit 21, an inverter and a converter can be listed. The power conversion unit 21 is electrically connected to the motor 40 through the bus bar 22.

[0047] Next, the structure of the housing 10 will be described. Figure 2 1 is a perspective view showing the driving device 1. Figure 2 , the second housing 12 and the power conversion unit 21 are shown in a state where they are removed. In addition, the position of the first end surface 43e of the motor shaft 43 is shown by a dotted line. Figure 3 An exploded plan view of the drive device 1 is shown.

[0048] The first housing 11 includes a first flange 11f extending along the outer periphery of the first housing 11. Figure 3 In the embodiment, the first flange 11f is formed in the overlapping section OS, the section SS and the region R1. The second housing 12 includes a second flange 12f extending along the outer periphery of the second housing 12. The motor housing 13 includes a motor housing flange 13f extending along the outer periphery of the motor housing 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 housing flange 13f and the facing surface 13s. In the present embodiment, the first flange 11f extends in an annular shape along the outer periphery of the first housing 11, and the second flange 12f extends in an annular shape along the outer periphery of the second housing 12, but the present invention is not limited to this mode. The first flange 11f and the second flange 12f only need to extend along at least the motor housing flange 13f. That is, the first flange 11f and the second flange 12f may not be arranged in the facing region where the first housing 11 and the second housing 12 face each other in the radial direction.

[0049] like Figure 3 As shown, 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 facing surface 13s of the motor case 13 and the second flange 12f.

[0050] In addition, the first shell 11 has an extension portion 14 extending from the end E1 of the overlapping interval OS to the end E2. The extension portion 14 is a frame-shaped member extending along the outer edge of the second shell 12. The extension portion 14 has the same thickness as the first flange 11f. The extension portion 14 is formed integrally with the first shell 11. A plurality of fastening holes 14h are arranged in the extension portion 14. A base having a closed ring shape is formed by the first flange 11f and the extension portion 14 arranged in the overlapping interval OS. An opening area OA is formed on the inner side of the ring-shaped base. The ring-shaped base is formed so as to overlap with the second flange 12f for one circle when the second shell 12 is assembled. That is, the ring-shaped base also functions as a spacer ring.

[0051] The first housing 11 and the second housing 12 are fastened to the motor housing 13 by a plurality of bolts 60. The length direction of the plurality of bolts 60 is substantially parallel to the central axis CA of the motor shaft 43. To be described in detail. The plurality of bolts 60 include at least one first universal bolt 61 disposed in the overlapping section OS. In other words, the second housing 12 is disposed on the first housing 11 at the position of the first universal 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 housing 13 are consistent. Moreover, the first universal bolt 61 passes through the fastening hole 12h and the fastening hole 11h and is inserted into the fastening hole 13h. Thus, the first housing 11 and the second housing 12 are fastened to the motor housing 13 together.

[0052] In addition, the plurality of bolts 60 include at least one second universal bolt 62 disposed in the extension section ES where the extension 14 is located. In the extension section ES, the second universal bolt 62 passes through the fastening hole 12h and the fastening hole 14h and is inserted into the fastening hole 13h. Thus, the extension 14 and the second housing 12 are fastened to the motor housing 13 together. In other words, the extension 14 is located between the motor housing 13 and the second flange 12f.

[0053] The bolt 60 is arranged in the section SS other than the overlapping section OS in the first flange 11f. In the section SS, the bolt 60 passes through the fastening hole 11h and is inserted into the fastening hole 13h (see Figure 3 ). Thus, the first housing 11 is fastened to the motor housing 13.

[0054] Next, the positional relationship between the first housing 11 and the second housing 12 and the motor shaft 43 is described. The first housing 11 and the second housing 12 are both fixed to the facing surface 13s of the motor housing 13. The facing surface 13s is a surface on one side in the central axis direction D2 of the motor housing 13. In the present embodiment, the first housing 11 and the motor housing 13 are fixed in a manner of contacting each other by a plurality of bolts 60, but are not limited to this manner. For example, an adhesive material such as a liquid gasket (FIPG) may be sandwiched between the first housing 11 and the motor housing 13 for fixing. Similarly, an adhesive or the like may be sandwiched between the second housing 12 and the first housing 11 for fixing. The first housing 11 has a height H1 in the vehicle width direction. The second housing 12 has a height H2 in the vehicle width direction. The height H2 is greater than the height H1.

[0055] The first housing 11 includes a motor shaft region MR (see Figure 2 The motor shaft region MR has a shape protruding in a direction perpendicular to the central axis CA. The motor shaft region MR has a width W1 in a direction perpendicular to the central axis CA and in the up-down direction of the vehicle. In addition, the motor shaft region MR has a height H1 in the central axis direction D2.

[0056] The second housing 12 has an opening AP on the surface on the front side of the vehicle. The opening AP has a width W1 in a direction perpendicular to the central axis CA and in the vertical direction of the vehicle. In addition, it has a height H1 in the central axis direction D2. That is, the opening AP has a shape and size corresponding to the motor shaft region MR. Therefore, by assembling the second housing 12 on the first housing 11, the motor shaft region MR of the first housing 11 can be accommodated in the opening AP of the second housing 12. As a result, the first flange 11f (see Figure 3 , region R1) is covered by the second shell 12.

[0057] A second flange 12f is arranged around the opening AP. By assembling the second shell 12 on the first shell 11, the second flange 12f arranged along the opening AP can be made to be in close contact with the surface of the first shell 11. The second flange 12f arranged along the opening AP has an upper surface section US that contacts the upper surface 11u of the first shell 11. A fastening hole 12h2 is arranged in the upper surface section US. In addition, a fastening hole 11h2 is arranged in the upper surface 11u of the first shell 11. By inserting the bolt 60 in a manner that passes through the fastening hole 11h2 and the fastening hole 12h2, the second shell 12 can be fastened to the upper surface 11u of the first shell 11. Thus, the second flange 12f formed along the opening AP can be fixed to the outer surface of the first shell 11 in a liquid-tight manner. Therefore, it is possible to prevent liquids and the like from entering the second shell 12.

[0058] A cover region CR is formed on a portion of the upper surface 12u of the second housing 12. The cover region CR is a region covering the motor shaft region MR of the first housing 11. Figure 1 As shown, in the cover region CR, a space SPa is formed in the second housing by the first housing 11 and the second housing 12. That is, the cover region CR covers the motor shaft region MR of the first housing 11 via the space SPa.

[0059] In addition, in the space SPa, a noise-proofing structure 12r is provided in an area corresponding to the covered area CR. The noise-proofing structure 12r is a structure having a noise suppression function. The noise-proofing structure 12r can be arranged on at least one of the inner surface of the second shell 12 and the upper surface of the first shell 11. In addition, the noise-proofing structure 12r can be various structures. For example, it can also be a rib formed integrally with the shell. In addition, for example, noise-proofing materials such as rubber can also be bonded. In this first embodiment, the noise-proofing structure 12r adopts a rib structure formed on the inner surface of the second shell 12.

[0060] Next, the structure of the power conversion unit 21 will be described. Figure 2 As shown, 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 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 also include at least one of various sensors, a DCDC converter, a coil, and a capacitor. As examples of various sensors, sensors that detect at least one of the voltage, current, and temperature in the power conversion unit 21 can be listed.

[0061] The first component 21_1 and the second component 21_2 are electrically connected via a wiring 23. The wiring 23 may be a busbar. Figure 1 As shown, the wiring 23 is routed through the space SPa. As a result, the space SPa can be effectively utilized, so the volume of the drive device 1 can be reduced. In addition, as a modified example, another member may be interposed between the first member 21_1 and the second member 21_2.

[0062] Next, the effects of the drive device of the first embodiment will be described. In the drive device 1 of the first embodiment, the central axis CA of the motor shaft 43 is covered by the first housing 11 and the second housing 12 in the central axis direction D2. Thus, compared with the case where the central axis CA is covered only by the first housing 11, the noise radiated from the vicinity of the first end surface 43e of the motor shaft 43 can be suppressed.

[0063] In the drive device 1 of the first embodiment, the entire first end surface 43e of the motor shaft 43 is covered by the first housing 11 and the second housing 12 in the central axis direction D2. Thus, compared with the case where the first end surface 43e is covered only by the first housing 11, the noise radiated from the vicinity of the first end surface 43e of the motor shaft 43 can be suppressed.

[0064] The shaft gear 51 meshes with the first countershaft gear 53 at the meshing point MP (see Figure 1 ). In the drive device 1 of the first embodiment, the meshing point MP is covered by the first housing 11 and the second housing 12 in the central axis direction D2. Thus, compared with the case where the meshing point MP is covered only by the first housing 11, the noise generated from the meshing point MP can be suppressed.

[0065] In the drive device 1 of the first embodiment, the noise prevention structure 12r disposed in the space SPa can suppress radiated sound from the vicinity of the first end surface 43e of the motor shaft 43. Since the space SPa can be effectively utilized, the volume of the drive device 1 can be suppressed and the noise suppression effect can be improved.

[0066] Next, a driving device according to a second embodiment of the present invention is described. The second embodiment differs from the first embodiment in that the first flange 11f and the second flange 12f are independently fixed to the motor housing 13. That is, the second housing 12 is fixed to the first housing 11 in the first embodiment, but is fixed to the motor housing 13 in the second embodiment. The same reference numerals are given to the common parts in the first embodiment and the second embodiment, and the description thereof is omitted.

[0067] Figure 4 A perspective view showing a driving device 201 according to the second embodiment. Figure 4 , the second housing 12, the first component 21_1, and the second component 21_2 are shown in a state where they are removed. Figure 5 An exploded plan view of the drive device 201 is shown.

[0068] In the driving device 201 of the second 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 housing 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 housing flange 13f by the first common bolt 61. In addition, the first housing 11 does not have the extension portion 14. Figure 5As shown, the facing surface 13s of the motor housing 13 has a first fixing surface MS1 for fixing the first housing 11 and a second fixing surface MS2 for fixing the second housing 12. Moreover, the bolt 60 is inserted in a manner penetrating the fastening hole 12h of the second flange 12f and the fastening hole 13h of the motor housing flange 13f. In addition, the bolt 60 is inserted in a manner penetrating the fastening hole 12h2 arranged in the upper surface section US of the second flange 12f and the fastening hole 11h2 arranged in the upper surface 11u of the first housing 11.

[0069] Thus, the second housing 12 can be fixed to the motor housing 13 so as to cover the motor shaft region MR of the first housing 11. The effects obtained by the drive device 201 of the second embodiment are the same as those of the drive device 1 of the first embodiment, and thus description thereof is omitted.

[0070] Next, a driving device according to a third embodiment of the present invention will be described. The third embodiment differs from the first embodiment mainly in that the second housing 12 includes a high rigidity portion 12t and a pair of mounting brackets 17. The same reference numerals are used for common parts in the first and third embodiments, and description thereof is omitted.

[0071] Figure 6 A cross-sectional view showing a driving device 301 according to a third embodiment. Figure 6 The first embodiment Figure 1 Cross-sectional view at the same position. The second housing 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. Thickness T1 is thicker than thickness T2. In other words, the high-rigidity portion 12t is a portion having higher rigidity than the low-rigidity portion. Moreover, the low-rigidity portion is a portion other than the high-rigidity portion 12t in the second housing 12. A pair of mounting brackets 17 are respectively arranged on the high-rigidity portion 12t in a manner protruding from the high-rigidity portion 12t. The mounting bracket 17 is a portion for mounting the drive device 301 on the vehicle. The mounting bracket 17 may also be formed integrally with the second housing 12. By fixing the root of the mounting bracket 17 to the high-rigidity portion 12t, the mounting strength of the drive device 301 on the vehicle can be improved.

[0072] The central axis CA of the motor shaft 43, the entire first end surface 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. Thus, the high rigidity portion 12t can also function as a sound insulation portion for suppressing noise. According to the mass law and the rigidity law, the noise suppression effect can be further improved.

[0073] In addition, the countershaft 52 has a second end face 52e facing the first housing 11. In addition, the amount of protrusion of the first end face 43e of the motor shaft 43 from the facing surface 13s in the central axis direction D2 is smaller than the amount of protrusion of the second end face 52e of the countershaft 52 from the facing surface 13s in the central axis direction D2. This is because the motor shaft 43 has only one gear (shaft gear 51), while the countershaft 52 has two gears (first countershaft gear 53, second countershaft gear 54). Therefore, the countershaft 52 is longer than the motor shaft 43 in terms of the axial length in the central axis direction D2 in the first housing 11. As a result, a space SPc can be generated in the second housing 12 in the central axis direction D2 of the motor shaft 43. As a result, the capacity of the second housing 12 can be sufficiently ensured.

[0074] Next, a modification of the third embodiment will be described. In the drive device of the modification of the third embodiment, the structure of the high rigidity portion 12t can be various structures. For example, the rigidity of the high rigidity portion 12t can also be improved by ribs. In addition, the ribs of the noise prevention structure 12r can also be used as ribs for improving the rigidity of the high rigidity portion 12t.

[0075] Each embodiment is described in detail above, but these are only examples and do not limit the claims. The technology described in the claims includes technologies obtained by various deformations and changes to the specific examples illustrated above. The technical elements described in this specification or drawings exert technical usefulness alone or through various combinations, and are not limited to the combinations described in the claims at the time of application. In addition, the technology illustrated in this specification or drawings achieves multiple purposes at the same time, and achieving one of the purposes itself has technical practicality.

[0076] Next, a driving device according to a modified example of the embodiment of the present invention will be described. The second housing 12 may cover the motor shaft region MR in various ways. For example, Figure 7 As shown in the driving device 401, the second shell 12 may also have a recessed portion RP instead of the opening portion AP. The recessed portion RP has a shape and size corresponding to the motor shaft region MR. Therefore, by assembling the second shell 12 on the first shell 11, the motor shaft region MR of the first shell 11 can be accommodated in the recessed portion RP of the second shell 12. As a result, a portion of the second shell 12 can be extended over the motor shaft region MR. Moreover, the extended portion can function as a covering region CR that covers the motor shaft region MR. In this manner, the second flange 12f can be entirely arranged on the same plane, so the airtightness of the second shell 12 can be further improved.

[0077] Various wirings can be arranged in the space SPa formed in the coverage area CR. For example, cables and various harnesses for connecting the power conversion unit 21 to external devices may be arranged in the space SPa.

[0078] The extension portion 14 may be provided as a component separate from the first housing 11 .

[0079] The vehicle equipped with the drive device of this specification is not limited to electric vehicles. The drive device of this specification can also be installed in hybrid vehicles and plug-in hybrid vehicles, for example. In this case, the drive device of this specification can accommodate multiple motors in the housing, and can also accommodate a planetary gear mechanism. In addition, the drive device of this specification can also be applied to vehicles such as fuel cell vehicles that use electric motors at least in part of their driving.

Claims

1. A driving device for a vehicle, characterized in that: The driving device comprises: A motor having a motor shaft; a motor housing configured to accommodate the motor; a first housing configured to accommodate a gear unit mechanically connected to the motor; and A second housing, wherein the second housing is configured to accommodate a power conversion unit electrically connected to the motor, wherein: The first housing and the second housing are fixed to one side of the motor housing in the axial direction of the motor shaft, and The central axis of the motor shaft is covered by the first housing and the second housing in the axial direction of the motor shaft.

2. The driving device according to claim 1, characterized in that: The motor shaft has a first end surface facing the first housing, and The entire first end surface of the motor shaft is covered by the first housing and the second housing in the axial direction of the motor shaft.

3. The driving device according to claim 2, characterized in that: The driving device further comprises: a first gear mounted on the motor shaft; and a second gear, the second gear meshing with the first gear, wherein A meshing point between the first gear and the second gear is covered by the first housing and the second housing in the axial direction of the motor shaft.

4. The driving device according to claim 3, characterized in that: The driving device further comprises a secondary shaft, on which the second gear is mounted and which is arranged parallel to the motor shaft, wherein: The secondary shaft has a second end surface facing the first housing, and The protrusion amount of the first end surface of the motor shaft in the axial direction is smaller than the protrusion amount of the second end surface of the auxiliary shaft in the axial direction.

5. The driving device according to claim 1, characterized in that: At least a portion of the periphery of the second shell is fixed to the outer surface of the first shell in a liquid-tight manner.

6. The driving device according to claim 5, characterized in that: In the axial direction of the motor shaft, at least a portion of the second housing covers at least a portion of the first housing via a space, and, Wiring electrically connected to the power conversion unit is arranged in the space.

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

8. The driving device according to claim 1, characterized in that: At least a portion of the second shell covers at least a portion of the first shell via a space, and, In the space, a noise prevention structure is provided in at least one of the first housing and the second housing.

9. The driving device according to claim 1, characterized in that: The second housing has a mounting bracket mounted on the vehicle, and At least a portion of the mounting bracket overlaps the motor shaft in the axial direction of the motor shaft.

10. The driving device according to claim 9, characterized in that: The second housing includes a low rigidity portion and a high rigidity portion having a higher rigidity than the low rigidity portion. The mounting bracket protrudes from the high rigidity portion, and The high-rigidity portion covers the central axis of the motor shaft in the axial direction of the motor shaft.

11. The driving device according to claim 1, characterized in that: The first housing includes a first flange extending along an outer peripheral edge of the first housing and fixed to the motor housing by a part of a plurality of fastening members. The second housing includes a second flange extending along an outer peripheral edge of the second housing and fixed to the motor housing by a part of the plurality of fastening members, and The first flange and the second flange are independently fixed to the motor housing.

12. The driving device according to claim 1, characterized in that: The first housing and the second housing are fastened to the motor housing by a plurality of fastening members. The plurality of fastening members include at least one common fastening member for fastening the first housing and the second housing to the motor housing, and The second housing is arranged above the first housing at the location of the at least one universal fastening member.

13. The driving device according to claim 12, characterized in that: The first housing includes a first flange extending along an outer peripheral edge of the first housing and fixed to the motor housing by a part of the plurality of fastening members. The second housing includes a second flange extending along an outer peripheral edge of the second housing and fixed to the motor housing by a part of the plurality of fastening members. A portion of the first flange has an overlapping region between the motor housing and the second flange, and The at least one universal fastening member includes at least one first universal fastening member located in the overlapping section.

14. The driving device according to claim 1, characterized in that: The first housing includes a first flange extending along an outer peripheral edge of the first housing and fixed to the motor housing by a plurality of fastening members, and The second housing covers at least a portion of the first flange.

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