Method for manufacturing housing of vehicle drive device, method for manufacturing vehicle drive device, and vehicle drive device

Abstract

The present application relates to a manufacturing method of a housing of a vehicle drive device, a manufacturing method of a vehicle drive device, and a vehicle drive device. In a manufacturing method of a housing of a vehicle drive device provided with a housing that forms a housing space, a lubrication object that is disposed around a rotation shaft disposed in the housing space, a first oil hole that is formed on an outer peripheral side of the lubrication object in an axial direction, and a second oil hole that is formed in a manner of communicating the first oil hole and the housing space, and that supplies lubricating oil to the lubrication object through the first oil hole and the second oil hole, the following steps are provided: a wall thickness portion forming step (step S1) of forming a wall thickness portion that extends in the axial direction in a wall portion of the housing, a first oil hole forming step (step S2) of forming the first oil hole by perforating the wall thickness portion, and a second oil hole forming step (step S3) of forming the second oil hole by perforating the wall thickness portion.

Description

TECHNICAL FIELD

[0001] The present application relates to a manufacturing method of a housing of a vehicle drive device, a manufacturing method of a vehicle drive device, and a vehicle drive device. BACKGROUND

[0002] In the past, as a vehicle drive device suitable for an electric vehicle, a hybrid vehicle, and the like, a device that supplies lubricating oil to a lubrication target (hereinafter, referred to as a lubrication target) such as a rotary electric machine, a gear, and the like in a housing, and lubricates and / or cools the lubrication target has been widespread. As such a lubrication device of a vehicle drive device, a lubrication device that provides a dedicated pipe for supplying lubricating oil on an outer peripheral side of a lubrication target in a housing, and supplies lubricating oil from the dedicated pipe to the lubrication target is known (see Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2011-193642

[0004] However, in the lubrication device described in Patent Document 1, a dedicated pipe is used in order to supply lubricating oil to a lubrication target, and accordingly, the cost is high. In addition, in order to fix the dedicated pipe in the housing, a member for fixation is required, and it is possible that the cost is further increased, and the configuration is complicated. SUMMARY

[0005] Therefore, an object is to provide a manufacturing method of a housing of a vehicle drive device, a manufacturing method of a vehicle drive device, and a vehicle drive device, which can omit a dedicated pipe for supplying lubricating oil to a lubrication target.

[0006] The manufacturing method of a housing of a vehicle drive device of the present application is a manufacturing method of a housing of a vehicle drive device that has a housing that forms an accommodation space, a vehicle drive motor that is disposed in the accommodation space and has a rotation axis, a first oil hole that is formed on an outer peripheral side of the vehicle drive motor in an axial direction of the rotation axis, and a second oil hole that is formed in a manner that communicates the first oil hole and the accommodation space, and supplies lubricating oil for lubrication and / or cooling to the vehicle drive motor through the first oil hole and the second oil hole, and has a wall thickness portion forming step that forms a wall thickness portion that has a shape extending in the axial direction in a wall portion of the housing in an integral manner with the housing, a first oil hole forming step that forms the first oil hole by perforating the wall thickness portion, and a second oil hole forming step that forms the second oil hole by perforating the wall thickness portion.

[0007] Further, the vehicle drive device manufacturing method of the present application, the vehicle drive motor having a stator fixed to the housing manufactured by the housing manufacturing method described above, and a rotor fixedly supported by the rotating shaft, the vehicle drive device manufacturing method comprising: a stator assembly process of assembling the stator to the housing in a manner that the stator opposes the opening of the second oil hole at the opening of the housing.

[0008] Further, the vehicle drive device of the present application, the vehicle drive device comprising: a housing forming a housing space; a vehicle drive motor disposed in the housing space and having a rotating shaft; a first oil hole formed at an outer periphery of the vehicle drive motor along an axial direction of the rotating shaft; and a second oil hole formed to communicate with the first oil hole and the housing space and to supply lubricating oil for lubrication and / or cooling from the first oil hole to the vehicle drive motor, the housing having a wall thickness portion having a shape extending along the axial direction integrally with the housing at a wall portion of the housing, the first oil hole and the second oil hole being formed by perforating the wall thickness portion, respectively.

[0009] According to the housing manufacturing method of the vehicle drive device, the vehicle drive device manufacturing method, and the vehicle drive device of the present application, lubricating oil can be supplied to the vehicle drive motor as an object of lubrication and / or cooling, and a dedicated pipe is not required, so that cost reduction can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is an exploded perspective view of a housing of a vehicle drive device of a first embodiment.

[0011] Figure 2 is a perspective view of a wall thickness portion of a motor housing of the vehicle drive device of the first embodiment.

[0012] Figure 3 is a diagram of a lubricating oil supply path of the vehicle drive device of the first embodiment.

[0013] Figure 4A is a perspective view of a motor housing of the vehicle drive device of the first embodiment, and is a state before the first oil hole is formed.

[0014] Figure 4B is a perspective view of a motor housing of the vehicle drive device of the first embodiment, and is a state when the first oil hole is formed.

[0015] Figure 5A is a perspective view of a motor housing of the vehicle drive device of the first embodiment, and is a state after the first oil hole is formed.

[0016] Figure 5Bis a perspective view showing a motor case of the vehicle drive device of the first embodiment, and is a state at the time of forming a second oil hole.

[0017] Figure 6 is a perspective view showing a state of cleaning the first oil hole and the second oil hole of the vehicle drive device of the first embodiment.

[0018] Figure 7 is a perspective view showing a state of performing a penetration inspection of the second oil hole of the vehicle drive device of the first embodiment.

[0019] Figure 8 is a flowchart showing a sequence of manufacturing the vehicle drive device of the first embodiment.

[0020] Figure 9 is a perspective view showing a modification example at the time of forming the second oil hole of the vehicle drive device of the first embodiment.

[0021] Figure 10 is a sectional view showing a case and a motor of the vehicle drive device of the second embodiment. DETAILED DESCRIPTION

[0022] <First Embodiment>

[0023] Hereinafter, with reference to Figures 1-8 The first embodiment of the present application will be described in detail. The vehicle drive device 1 of the present embodiment is a device mounted on an electric vehicle of so-called FF (Front Engine / Front Drive) type. Herein, the vehicle drive device 1 is not limited to the electric vehicle, but can be a hybrid vehicle, and is not limited to the FF type, but can be an FR (Front Engine / Rear Drive) type.

[0024] [Outline structure of vehicle drive device]

[0025] As shown in Figure 1 , the vehicle drive device 1 of the present embodiment has a case 2 that forms an accommodation space 20, a motor 3 that is a vehicle drive motor that outputs a driving force for running of a vehicle and is disposed in the accommodation space 20, and a power transmission mechanism, a hydraulic control device, and the like, not shown. The case 2 is disposed with a vehicle left-right direction as an axial direction Dl, and has a motor case 21 that is one example of a first case member, a cover 22 that is one example of a second case member, and a transfer case 23. In the present embodiment, with respect to the axial direction Dl of the case 2, the opening side of the accommodation space 20 of the motor case 21 is set as an X direction, and the opposite side thereof is set as a Y direction. The cover 22 is connected to the X direction side of the motor case 21, and the transfer case 23 is connected to the Y direction side of the motor case 21, and these motor case 21, cover 22, and transfer case 23 are integrated to constitute the case 2.

[0026] [Structure of lubricating oil supply]

[0027] As Figure 2 and Figure 4A shown, the motor housing 21 has wall thickness portions 40, 50 at the outer peripheral side of the accommodation space 20 that accommodates the motor 3. The wall thickness portions 40, 50 are formed integrally with the wall portion 24 of the motor housing 21 and are shaped so as to extend along the axial direction D1. The wall thickness portions 40, 50 are both disposed above the motor 3, and are disposed adjacent to and parallel to each other with the axial direction D1 as the long side direction. The wall thickness of the wall thickness portions 40, 50 is formed to be thicker than the other wall portion 24, and has a thickness sufficient to allow the first oil holes 41, 51 and the second oil holes 42, 52 described later to be perforated. In the present embodiment, although a case in which the wall thickness portions 40, 50 are provided at two portions above the motor 3 is described, the present application is not limited thereto, and the wall thickness portions 40, 50 can be provided at one portion or three or more portions.

[0028] As Figure 2 shown, the first oil holes 41, 51 and the second oil holes 42, 52 are formed in the wall thickness portions 40, 50, respectively. The first oil holes 41, 51 are formed at the outer peripheral side of the motor 3 along the axial direction D1. The second oil holes 42, 52 are formed so as to communicate the first oil holes 41, 51 and the accommodation space 20, and in the present embodiment, a plurality of second oil holes 42, 52 are provided. The first oil holes 41, 51 communicate with end portions 43, 53 on the X direction side of the wall thickness portions 40, 50, and each of the end portions 43, 53 is closed by a cover member not shown. In addition, the first oil holes 41, 51 communicate with the first oil passage 61 at the end portions on the Y direction side without being exposed from the wall thickness portions 40, 50 to the accommodation space 20.

[0029] As Figure 3 shown, the vehicle drive device 1 (see Figure 1 ) has a pump 64 that discharges lubricating oil. The first oil passage 61 is connected to a cooler 63, and the cooler 63 is connected to the pump 64 via a second oil passage 62. A suction pipe 65 of the pump 64 is opened at the bottom of the motor housing 21.

[0030] The motor 3 has a stator 31 fixed to the motor housing 21, and a rotor 32 fixedly supported by the rotating shaft 30 disposed in the accommodation space 20. Lubricating oil is supplied to the motor 3 for lubrication and / or cooling. The stator 31 is an object of lubrication and / or cooling disposed so as to be centered on the rotating shaft 30, and is provided so as to oppose the second oil holes 42, 52. In the present embodiment, since the object of lubrication and / or cooling is the stator 31, the second oil holes 42, 52 are provided so as to face coil end portions of the stator 31 at both ends of the axial direction D1 where cooling is particularly required. That is, the second oil holes 42, 52 are formed so as to oppose the stator 31 and an opening portion that is opened to the accommodation space 20. Therefore, the second oil holes 42, 52 are provided at both ends of the axial direction D1 of the first oil holes 41, 51.

[0031] When supplying the lubricating oil 66 accumulated in the bottom of the motor case 21 to the stator 31, the pump 64 sucks the lubricating oil 66 via the suction pipe 65 and discharges it to the cooler 63 via the second oil passage 62. The lubricating oil cooled by the cooler 63 is circulated to the first oil holes 41, 51 via the first oil passage 61, from the first oil holes 41, 51 to the second oil holes 42, 52, and is supplied from the second oil holes 42, 52 to the stator 31. That is, the second oil holes 42, 52 supply the lubricating oil from the first oil holes 41, 51 to the stator 31, and the lubricating oil is supplied to the stator 31 through the first oil holes 41, 51 and the second oil holes 42, 52. In this way, the lubricating oil is supplied from the pump 64 to the stator 31 via the first oil holes 41, 51 and the second oil holes 42, 52.

[0032] [Manufacturing method of motor case and motor]

[0033] Next, the manufacturing method of the above motor case 21 will be described using the flowchart shown in FIG. 6. First, as shown in step S1 of FIG. 6, a rough material of the motor case 21 is formed by, for example, aluminum casting, and at this time, the wall thickness portions 40, 50 are formed in the wall portion 24 (wall thickness portion forming step). Figures 4A-7 Figure 8 Next, the manufacturing method of the above motor case 21 will be described using the flowchart shown in FIG. 6. First, as shown in step S1 of FIG. 6, a rough material of the motor case 21 is formed by, for example, aluminum casting, and at this time, the wall thickness portions 40, 50 are formed in the wall portion 24 (wall thickness portion forming step). Figure 4A Figure 8 Further, as shown in step S2 of FIG. 6, the first oil holes 41 are formed by perforating from the end portion 43 of the wall thickness portion 40 on the X-direction side in the axial direction Dl toward the Y-direction using a long drill 70 (first oil hole forming step). In the present embodiment, the first oil holes 41 are formed by installing a vertical (axial direction Dl) machining drill using a small-diameter main shaft in a general machining center as the long drill 70. Similarly, as shown in step S3 of FIG. 6, the first oil holes 51 are formed by perforating from the end portion 53 of the wall thickness portion 50 on the X-direction side in the axial direction Dl toward the Y-direction.

[0034] Further, as shown in step S2 of FIG. 6, the first oil holes 41 are formed by perforating from the end portion 43 of the wall thickness portion 40 on the X-direction side in the axial direction Dl toward the Y-direction using a long drill 70 (first oil hole forming step). In the present embodiment, the first oil holes 41 are formed by installing a vertical (axial direction Dl) machining drill using a small-diameter main shaft in a general machining center as the long drill 70. Similarly, as shown in step S3 of FIG. 6, the first oil holes 51 are formed by perforating from the end portion 53 of the wall thickness portion 50 on the X-direction side in the axial direction Dl toward the Y-direction. Figure 4B Figure 8 Further, as shown in step S2 of FIG. 6, the first oil holes 41 are formed by perforating from the end portion 43 of the wall thickness portion 40 on the X-direction side in the axial direction Dl toward the Y-direction using a long drill 70 (first oil hole forming step). In the present embodiment, the first oil holes 41 are formed by installing a vertical (axial direction Dl) machining drill using a small-diameter main shaft in a general machining center as the long drill 70. Similarly, as shown in step S3 of FIG. 6, the first oil holes 51 are formed by perforating from the end portion 53 of the wall thickness portion 50 on the X-direction side in the axial direction Dl toward the Y-direction. Figure 5A Figure 4B Further, as shown in step S2 of FIG. 6, the first oil holes 41 are formed by perforating from the end portion 43 of the wall thickness portion 40 on the X-direction side in the axial direction Dl toward the Y-direction using a long drill 70 (first oil hole forming step). In the present embodiment, the first oil holes 41 are formed by installing a vertical (axial direction Dl) machining drill using a small-diameter main shaft in a general machining center as the long drill 70. Similarly, as shown in step S3 of FIG. 6, the first oil holes 51 are formed by perforating from the end portion 53 of the wall thickness portion 50 on the X-direction side in the axial direction Dl toward the Y-direction.

[0035] Further, as shown in step S2 of FIG. 6, the first oil holes 41 are formed by perforating from the end portion 43 of the wall thickness portion 40 on the X-direction side in the axial direction Dl toward the Y-direction using a long drill 70 (first oil hole forming step). In the present embodiment, the first oil holes 41 are formed by installing a vertical (axial direction Dl) machining drill using a small-diameter main shaft in a general machining center as the long drill 70. Similarly, as shown in step S3 of FIG. 6, the first oil holes 51 are formed by perforating from the end portion 53 of the wall thickness portion 50 on the X-direction side in the axial direction Dl toward the Y-direction. Figure 5B Figure 8 ​​​​​Step S3, the second oil hole forming process). The cross-type drill bit 71 has: a support shaft 72 with the axial direction D1 as its long side; and a drill head 73 disposed at the front end of the support shaft 72 and facing a direction orthogonal to the axial direction D1. The drill head 73 is a horizontal (crossing direction of the axial direction D1) machining drill bit and is an electrically driven drill bit. However, the drill head 73 is not limited to an electrically driven type, and may also be an air-driven type, for example. In this embodiment, the cross-type drill bit 71 is mounted on a general-purpose machining center to form the second oil hole 42. Similarly, the second oil hole 52 is formed by perforating from the receiving space 20 side of the wall thickness portion 50 along a direction intersecting the axial direction D1 toward the first oil hole 51 (see reference). Figure 6 In addition, multiple second oil holes 42 and 52 are provided, and their formation order can be appropriately set.

[0036] Thus, in this embodiment, the first oil holes 41 and 51 and the second oil holes 42 and 52 are formed by perforation in the wall thickness portions 40 and 50, respectively. Here, in this embodiment, the second oil hole forming process is performed after the first oil hole forming process. Therefore, the first oil holes 41 and 51 are already formed when the second oil holes 42 and 52 are formed, so the first oil holes 41 and 51 and the second oil holes 42 and 52 can be reliably connected. However, it is not limited to the case where the second oil hole forming process is performed after the first oil hole forming process; the first oil hole forming process can also be performed after the second oil hole forming process.

[0037] After forming the first oil holes 41, 51 and the second oil holes 42, 52, as Figure 6 As shown, the chips remaining in the first oil hole 51 and the second oil hole 52 are cleaned. Figure 8 Step S4, cleaning process). Here, for example, water W is sprayed from the spraying device 74 into the opening 51a on the X-direction side of the first oil hole 51 and sprayed out from the second oil hole 52, thereby washing away the chips remaining in the first oil hole 51 and the second oil hole 52. In addition, Figure 6 The image shows the cleaning of the first oil hole 51 and the second oil hole 52, but... Figure 5B The first oil hole 41 and the second oil hole 42 shown are also cleaned in the same way.

[0038] After cleaning the first oil holes 41 and 51 and the second oil holes 42 and 52 Figure 7 As shown, a penetration test is performed on the second oil hole 52. Figure 8Step S5, inspection process). Here, for example, the opening 51a of the first oil hole 51 in the X direction is illuminated from the X direction side by a light-emitting device 75 such as a pen-shaped flashlight. The second oil hole 52 is visually observed from the penetration direction of the second oil hole 52, i.e., direction D2. If the light from the first oil hole 51 can be confirmed, it is determined that the second oil hole 52 is open. If the second oil hole 52 is found to be blocked by chips or the like and is not open, a process is performed to open the second oil hole 52 by inserting a thin rod or the like. In addition, Figure 7 Although the inspection of the second oil hole 52 is shown, the second oil hole 42 is also inspected in the same way.

[0039] After checking the penetration of the second oil holes 42 and 52, assemble the motor 3 into the motor housing 21. Figure 8 Step S6, stator assembly process). At this time, the motor 3 is assembled onto the motor housing 21 with the stator 31 and the second oil holes 42 and 52 facing each other at the opening of the storage space 20. Then, the cover 22 is assembled onto the motor housing 21. Figure 8 Step S7) completes the vehicle drive unit 1.

[0040] As explained above, in the vehicle drive device 1 according to this embodiment, the motor housing 21 has wall thicknesses 40 and 50. First oil holes 41 and 51 and second oil holes 42 and 52 for supplying lubricating oil to the stator 31 are formed through these wall thicknesses, ensuring lubricating oil supply and eliminating the need for a dedicated pipe for supplying lubricating oil to the stator 31. Therefore, costs are reduced compared to using a dedicated pipe. Furthermore, since no component is needed to fix the dedicated pipe within the housing, further cost increases and structural complexity are avoided. Moreover, compared to using a dedicated pipe, pressure loss due to poor connection is suppressed, thus stabilizing the supply of lubricating oil to the stator 31.

[0041] Furthermore, according to the vehicle drive unit 1 of this embodiment, since the object of lubrication and / or cooling is the stator 31 of the motor 3, a sufficiently large storage space 20 for the motor 3 can be provided near the wall thickness portions 40 and 50. Therefore, tools such as long drill bits 70 and cross-type drill bits 71 can be easily inserted into the inner side of the axial direction D1, thereby improving workability.

[0042] Furthermore, the manufacturing method of the motor housing 21 of the vehicle drive device 1 according to this embodiment includes: a wall thickness forming step for forming wall thickness portions 40 and 50; a first oil hole forming step for forming first oil holes 41 and 51; and a second oil hole forming step for forming second oil holes 42 and 52. Therefore, the supply of lubricating oil can be ensured, and the dedicated pipe for supplying lubricating oil to the stator 31 can be omitted. Therefore, compared with the case of using a dedicated pipe, the cost can be reduced. In addition, there is no need for a component for fixing the dedicated pipe inside the housing, so further increases in cost and structural complexity can be avoided. Moreover, compared with the case of using a dedicated pipe, the generation of pressure loss due to poor connection can be suppressed, so the supply of lubricating oil to the stator 31 can be stabilized.

[0043] Furthermore, according to the manufacturing method of the motor housing 21 of the vehicle drive device 1 in this embodiment, after the first oil hole forming step and the second oil hole forming step, a cleaning step is performed to clean the chips remaining in the first oil holes 41, 51 and the second oil holes 42, 52. Therefore, the chips remaining in the first oil holes 41, 51 and the second oil holes 42, 52 can be removed, thus stabilizing the supply of lubricating oil to the stator 31.

[0044] In the vehicle drive unit 1 of this embodiment described above, the case where the second oil holes 42 and 52 are formed by the cross-type drill bit 71 is explained, but it is not limited to this. For example, as Figure 9 As shown, the second oil hole 52 can also be formed using a circular grooving cutter 77 with a rotating shaft 76 along the axial direction D1. In this case, the grooving cutter 77 is positioned along the axial direction D1, the rotating shaft 76 is rotated, and cutting is performed until the outer periphery of the grooving cutter 77 reaches the first oil hole 51, thus forming the second oil hole 52 communicating with the first oil hole 51. In this case, since the second oil hole forming process for forming the second oil holes 42 and 52 is included, the dedicated pipe for supplying lubricating oil to the stator 31 can be omitted.

[0045] <Second Implementation>

[0046] Next, refer to Figure 10 The second embodiment of the present invention will be described in detail. In this embodiment, the structure differs from the first embodiment in that the end of the first oil hole 141 formed in the wall thickness portion 140 of the motor housing 121 is closed on the Y-direction side while the end 143 on the X-direction side is connected to the oil passage 122a of the cover 122. The structure other than this is the same as the first embodiment, so the same reference numerals are used and detailed descriptions are omitted.

[0047] In the present embodiment, the motor housing 121 as one example of the first housing member has an engaging surface 121a that engages with the cover 122 as one example of the second housing member. Also, the thick-walled portion 140 is shaped such that an end portion 143 on the one side of the axial direction Dl, that is, the X-direction side, extends to the engaging surface 121a. The first oil hole 141 opens at the engaging surface 121a, and the opening 141a communicates with the oil passage 122a formed in the cover 122. The lubricating oil supplied from the outside of the cover 122 to the oil passage 122a flows from the oil passage 122a to the first oil hole 141 via the opening 141a, and is supplied from the first oil hole 141 to the stator 31 via the second oil hole 142.

[0048] In the manufacturing method of the motor housing 121 of the vehicular drive device of the present embodiment, in the first oil hole forming step (see step S2 of the first embodiment), the first oil hole 141 is formed by perforating the thick-walled portion 140 from the engaging surface 121a. The other structures are the same as those of the first embodiment, and thus detailed description is omitted. Figure 8

[0049] As described above, according to the vehicular drive device of the present embodiment, since the first oil hole 141 opens at the engaging surface 121a with the cover 122, the first oil hole 141 can be made to communicate with the oil passage 122a of the cover 122 by joining the cover 122 to the motor housing 121. Therefore, it is possible to simplify the formation of the oil passage for supplying the lubricating oil to the first oil hole 141. In addition, in the first oil hole forming step, the perforation is performed from the engaging surface 121a of the motor housing 121, and thus it is possible to reduce the working hours as compared with the case where the hole is formed by perforating from the outside of the motor housing 121, that is, the Y-direction side, and then closing the hole.

[0050] In the vehicular drive device of the present embodiment described above, although the case where the first oil hole 141 communicates with the oil passage 122a of the cover 122 is described, it is not limited thereto, and for example, the portion of the cover 122 that opposes the opening 141a on the engaging surface 121a of the first oil hole 141 can be shaped flat to close the first oil hole 141. In this case, it is possible to eliminate the need for other members for closing the first oil hole 141, and thus it is possible to reduce the number of components.

[0051] In addition, in the first and second embodiments described above, although the case where the object of lubrication and / or cooling is the motor 3 is described, it is not limited thereto, and it is also applicable to a transmission, a power transmission mechanism, and the like used in a vehicular drive device. In this case, it is possible to appropriately set the shapes and arrangements of the first and second oil holes in accordance with the supply position of the lubricating oil required by the object of lubrication and / or cooling.

[0052] Possibility of utilization in industry

[0053] ​The vehicle drive device, the method for manufacturing the housing of the vehicle drive device, and the method for manufacturing the vehicle drive device can be applied to, for example, a vehicle drive device provided with a motor mounted on a vehicle such as an automobile.

[0054] Explanation of Reference Signs

[0055] 1… vehicle drive device, 2… housing, 3… motor (vehicle drive motor), 20… accommodation space, 21, 121… motor housing (first housing member), 22, 122… cover (second housing member), 24… wall portion, 30… rotation shaft, 31… stator, 32… rotor, 40, 50, 140… wall thickness portion, 41, 51, 141… first oil hole, 42, 52, 142… second oil hole, 64… pump, 121a… joint surface, D1… axial direction.

Claims

1. A method for manufacturing a housing of a vehicle drive unit, comprising a housing forming a storage space, a vehicle drive motor disposed in the storage space and having a rotation axis, a first oil hole formed along the axial direction of the rotation axis on the outer periphery of the vehicle drive motor, and a second oil hole formed in a manner connecting the first oil hole and the storage space, and supplying lubricating oil for lubrication and / or cooling to the vehicle drive motor through the first oil hole and the second oil hole, the method comprising the following steps: In the wall thickness forming process, a wall thickness portion is integrally formed on the inner wall of the housing, protruding into the interior of the storage space and extending along the axial direction. The first oil hole forming process involves perforating the aforementioned wall thickness portion to form the aforementioned first oil hole; and The second oil hole forming process involves perforating the aforementioned wall thickness portion to form the aforementioned second oil hole.

2. The method for manufacturing the housing of the vehicle drive unit according to claim 1, wherein, The aforementioned housing includes: a first housing component forming the aforementioned wall thickness portion, and a second housing component. The first housing component has a mating surface that engages with the second housing component. The aforementioned wall thickness portion is the shape of one end of the aforementioned axial direction extending to the aforementioned mating surface. The aforementioned first oil hole opens at the aforementioned mating surface. In the above-mentioned first oil hole forming process, the first oil hole is formed by perforating the above-mentioned wall thickness portion from the above-mentioned mating surface.

3. The method for manufacturing the housing of the vehicle drive unit according to claim 1 or 2, wherein, After the first oil hole forming process and the second oil hole forming process, there is a cleaning process for cleaning the chips remaining in the first oil hole and the second oil hole.

4. A method for manufacturing a vehicle drive unit, wherein, The aforementioned vehicle drive motor comprises: a stator fixed to a housing manufactured by the method for manufacturing the housing of the vehicle drive device according to any one of claims 1 to 3, and a rotor fixedly supported by the aforementioned rotating shaft. The manufacturing method of the vehicle drive device includes: a stator assembly step, in which the stator and the second oil hole are positioned opposite each other at the opening of the storage space, and the stator is assembled into the housing.

5. The method for manufacturing a vehicle drive unit according to claim 4, wherein, The aforementioned vehicle drive unit has a pump for discharging the aforementioned lubricating oil. The aforementioned lubricating oil is supplied to the stator from the aforementioned pump via the aforementioned first oil hole and the aforementioned second oil hole.

6. A vehicle drive system comprising: The shell forms storage space; A vehicle drive motor is disposed in the aforementioned storage space and has a rotating shaft; A first oil hole is formed along the axial direction of the aforementioned rotation axis on the outer periphery of the aforementioned vehicle drive motor; and The second oil hole is configured to connect the first oil hole and the receiving space, and supplies lubricating oil for lubrication and / or cooling from the first oil hole to the vehicle drive motor. The aforementioned housing has an inner wall portion integrally formed with the housing, having a wall thickness that protrudes into the interior of the aforementioned storage space and extends along the aforementioned axial direction. The first oil hole and the second oil hole are formed by perforating the wall thickness portion.

7. The vehicle drive unit according to claim 6, wherein, Equipped with a pump to discharge the aforementioned lubricating oil, The aforementioned vehicle drive motor includes: a stator fixed to the aforementioned housing, and a rotor fixedly supported by the aforementioned rotating shaft. The aforementioned lubricating oil is supplied to the stator from the aforementioned pump via the aforementioned first oil hole and the aforementioned second oil hole.

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