Unit, vehicle, and method for manufacturing vehicle

Abstract

The size of a unit in a predetermined direction is reduced. A unit has a rotating electrical machine, a first gear connected downstream of the rotating electrical machine, a second gear engaged with the first gear, and a shaft connected downstream of the second gear, the shaft having a first output end and a second output end, the rotating electrical machine and the first gear being disposed on a first axis, and the second gear being disposed on a second axis. The second gear, the shaft, the first output end, and the second output end are disposed on a second axis, and the second gear is disposed between the first output end and the second output end.

Description

Technical Field

[0001] The present invention relates to a unit, a vehicle, and a method for manufacturing a vehicle. Background Art

[0002] Patent Document 1 discloses a unit including an electric motor, an automatic transmission, and a connection portion for transmitting power of the electric motor to the automatic transmission.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: (Japanese) Patent Publication No. 2013-005637 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] However, in the unit of Patent Document 1, the radial dimensions of the electric motor and the power transmission device are the outer diameters of the unit, and are the same dimensions in any direction.

[0008] An object of the present invention is to reduce the dimension of a unit in a predetermined direction.

[0009] Technical solutions for solving technical problems

[0010] According to a certain embodiment of the present invention, a unit comprises: a rotating motor, a first gear connected to the downstream of the rotating motor, a second gear meshing with the first gear, and a shaft connected to the downstream of the second gear, the shaft having a first output end and a second output end, the rotating motor and the first gear are arranged on a first axis, the second gear, the shaft, the first output end, and the second output end are arranged on a second axis, and the second gear is arranged between the first output end and the second output end.

[0011] Effects of the Invention

[0012] According to a certain aspect of the present invention, although the dimension of the first direction in which the first gear and the second gear are arranged in parallel becomes larger, the dimension of the second direction (prescribed direction) intersecting the first direction can be reduced. Thus, a favorable design can be performed when the restriction in the first direction is loose and the restriction in the second direction is strict. Therefore, the dimension of the unit in the prescribed direction can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of a vehicle including a unit according to an embodiment of the present invention.

[0014] Figure 2 is a cross-sectional view of the unit.

[0015] Figure 3 is a side view of the unit.

[0016] Figure 4 is a block diagram of the unit.

[0017] Figure 5 is a block diagram of a unit of a comparative example.

[0018] Figure 6 This is a structural diagram for explaining the first step of the vehicle manufacturing method.

[0019] Figure 7 This is a structural diagram for explaining the second step of the vehicle manufacturing method. DETAILED DESCRIPTION

[0020] Hereinafter, a drive unit 100 as a unit according to an embodiment of the present invention and a vehicle 1 having the drive unit 100 will be described with reference to the drawings.

[0021] First, refer to Figure 1 , vehicle 1 is described below. Figure 1 1 is a structural diagram of a vehicle 1 including a drive unit 100 .

[0022] The vehicle 1 is a so-called gasoline-powered EV (Electric Vehicle), which is powered by an internal combustion engine 9 (see Figure 6 ) is removed from an internal combustion engine 9 and replaced with a drive unit 100, and the vehicle 1 is driven by the drive unit 100. The vehicle 1 includes a drive unit 100, a transmission 2 as a first power transmission mechanism, an auxiliary machine 3, a belt 4 as a second power transmission mechanism, and a drive wheel 5.

[0023] The drive unit 100 includes a rotating electrical machine 10 (see Figure 2 ) electric drive unit. Figure 2 The specific structure of the driving unit 100 will be described in detail later.

[0024] It should be noted that, although the unit is applied to the driving of the driving wheel 5 of the vehicle 1, it is not limited thereto, and can also be applied to the driving of electrical products, for example. The unit is also referred to as a motor unit (a unit having at least a motor), a power transmission device (a device having at least a power transmission mechanism (such as a gear mechanism and / or a differential gear mechanism, etc.)), etc. It should be noted that a device (unit) having a motor and a power transmission mechanism belongs to the concepts of both the motor unit and the power transmission device.

[0025] The transmission 2 changes the speed of the driving force from the drive unit 100 and transmits the driving force to the drive wheels 5. The transmission 2 may be an automatic transmission or a manual transmission.

[0026] The auxiliary machine 3 is driven by the drive unit 100. The auxiliary machine 3 is, for example, an AC generator that is driven to rotate by the rotary electric machine 10 to generate electricity. The auxiliary machine 3 is connected to a second output end 40b (see FIG. 1 ) of the second shaft 40 described later. Figure 2 ) downstream connection.

[0027] The belt 4 transmits the driving force of the drive unit 100 to the auxiliary machine 3 .

[0028] The driving wheel 5 is connected to the first output end 40a of the second shaft 40 described later (see Figure 2 ) is connected downstream. Here, the driving wheel 5 is the rear wheel of the vehicle 1, but it can also be the front wheel of the vehicle 1.

[0029] Next, refer to Figure 2 and Figure 3 , the structure of the driving unit 100 is described. Figure 2 is a cross-sectional view of the drive unit 100, Figure 3 is a side view of the drive unit 100 .

[0030] like Figure 2 As shown, the drive unit 100 includes a rotary electric machine 10 , a speed reducer 20 as a speed reduction mechanism, a first shaft 30 , a second shaft 40 as a shaft, a housing 50 , a flywheel 60 , and a pulley 70 .

[0031] The rotating electric machine 10 has a motor function and / or a generator function. The rotating electric machine 10 is arranged on the first axis C1. The rotating electric machine 10 has a stator 11 and a rotor 12. The stator 11 is supported by a motor support portion 51c described later of the housing 50 so as not to rotate. The rotor 12 is arranged on the inner periphery of the stator 11 and rotates relative to the stator 11. The small-diameter gear 21 is mounted on the rotor 12 via the first shaft 30. The rotor 12 rotates together with the first shaft 30 and the small-diameter gear 21.

[0032] The speed reducer 20 includes a small-diameter gear 21 as a first gear and a large-diameter gear 22 as a second gear.

[0033] The small-diameter gear 21 is connected to the downstream of the rotary electric machine 10. The small-diameter gear 21 is arranged on the first axis C1. The so-called arrangement on the first axis C1 means that the small-diameter gear 21 is arranged coaxially with other components arranged on the first axis C1.

[0034] The large diameter gear 22 meshes with the small diameter gear 21. The large diameter gear 22 is arranged on the second axis C2 which is parallel to the first axis C1. The so-called arrangement on the second axis C2 means that it is arranged coaxially with other accessories arranged on the second axis C2. The large diameter gear 22 is formed to have a larger diameter than the small diameter gear 21. Therefore, the small diameter gear 21 and the large diameter gear 22 are used to form a reducer 20 that reduces the output of the rotating electric machine 10 and transmits it to the downstream.

[0035] Here, if Figure 3 As shown, if the same output as the drive unit 100 is attempted to be outputted only by the rotary electric machine MG, the radial dimension (W1) of the rotary electric machine MG is the outer diameter of the unit, and is the same dimension in any direction. Therefore, the dimension of the unit in the width direction may increase.

[0036] In contrast, in the drive unit 100, although the dimension of the first direction (here, the height direction) in which the small-diameter gear 21 and the large-diameter gear 22 are arranged in parallel is larger than that of the rotary electric machine MG, the dimension (W2) of the second direction (here, the width direction) as a prescribed direction intersecting (here, orthogonal) the first direction can be reduced to be smaller than that of the rotary electric machine MG (W2 < W1). Thus, a favorable design can be made when the restriction in the first direction is loose and the restriction in the second direction is strict. Therefore, the dimension of the prescribed direction of the drive unit 100 can be reduced.

[0037] In addition, the larger the maximum output torque of the rotating electric machine 10 is, the larger the size is. However, by providing the speed reducer 20 downstream of the rotating electric machine 10, the torque of the rotating electric machine 10 is increased by the speed reducer 20. Thus, the maximum output torque of the rotating electric machine 10 can be set smaller, and an option of reducing the size of the rotating electric machine 10 can be obtained.

[0038] like Figure 2 As shown, the large-diameter gear 22 is disposed between the first output end 40 a and the second output end 40 b of the second shaft 40 , and is located on the first output end 40 a side.

[0039] Since the driver perceives the change in the movement of the drive wheel 5 as a change in the movement of the vehicle 1 during driving, the influence of the movement of the drive wheel 5 is very important. The change in the movement transmitted to the input main component (here, the transmission 2) of the first output terminal 40a is directly related to the change in the movement of the drive wheel 5. On the other hand, the change in the movement transmitted to the auxiliary machine 3 has no direct relationship with the change in the movement of the vehicle 1 felt by the driver during driving. Therefore, by setting the large diameter gear 22 at a position closer to the first output terminal 40a than the second output terminal 40b, the distance between the large diameter gear 22 and the first output terminal 40a can be shortened, thereby suppressing the influence of the twisting or bending of the second shaft 40, and reducing the change in the movement of the vehicle 1.

[0040] The first shaft 30 supports the small-diameter gear 21 and the rotor 12 of the rotating electric machine 10. The first shaft 30 is an output shaft of the rotating electric machine 10. A rotary transformer 33 is provided on the first shaft 30 as a rotation speed detector for detecting the rotation speed. The first shaft 30 rotates around the first axis C1. The first shaft 30 is rotatably supported by the housing 50 using bearings 31 and 32.

[0041] The second shaft 40 is connected to the downstream of the large diameter gear 22. The second shaft 40 is arranged on the second axis C2. The second shaft 40 rotates around the second axis C2. The second shaft 40 is rotatably supported by the housing 50 using the bearings 41 and 42. The second shaft 40 is provided on the housing 50 in a manner similar to the internal combustion engine 9 (see FIG. 1 ) removed from the vehicle 1. Figure 6 ) at the same position on the crankshaft (not shown).

[0042] The second shaft 40 has a first output end 40a and a second output end 40b. The first output end 40a and the second output end 40b are disposed on the second axis C2. The first output end 40a and the second output end 40b are provided so as to be located at the same positions as the first output end and the second output end of the crankshaft, respectively.

[0043] The housing 50 is a housing member for housing the rotating electrical machine 10 , the speed reducer 20 , the first shaft 30 , the second shaft 40 , and an inverter (not shown). The housing 50 is composed of one or more housings, specifically, a first housing 51 , a second housing 52 , and a third housing 53 .

[0044] The housing 50 forms a three-in-one drive unit 100. The three-in-one means that a part of a motor case accommodating the rotary electric machine 10, a part of a speed reducer case accommodating the speed reducer 20, and a part of an inverter case accommodating the inverter are integrally formed.

[0045] The first housing 51 is formed in a cylindrical shape with both ends opened. The first housing 51 includes a support wall 51 a , a shaft support portion 51 b , and a motor support portion 51 c .

[0046] The support wall 51a is provided perpendicularly to the axial direction of the first housing 51. The axial direction refers to the axial direction of the rotating shaft of the accessories constituting the drive unit 100. The accessories are, for example, the rotating motor 10, the reducer 20, etc. The support wall 51a rotatably supports the first shaft 30 via the bearing 32. The rotary transformer 33 and the cover 34 that accommodates the rotary transformer 33 are mounted on the support wall 51a.

[0047] The second housing 52 is provided in parallel with the first housing 51 in the axial direction. The second housing 52 blocks one opening of the first housing 51. The second housing 52 rotatably supports the first shaft 30 via the bearing 31 and rotatably supports the second shaft 40 via the bearing 41.

[0048] The third case 53 is provided in parallel with the first case 51 and the second case 52 in the axial direction. The third case 53 closes the other opening of the first case 51 .

[0049] The flywheel 60 is disposed on the second axis C2. The flywheel 60 transmits the output torque of the drive unit 100 to the transmission 2. The flywheel 60 is disposed on the internal combustion engine 9 (see FIG. 1 ) removed from the vehicle 1. Figure 6 ) is at the same position as the flywheel (not shown).

[0050] The pulley 70 is disposed on the second axis C2. The belt 4 is wound around the pulley 70. The pulley 70 transmits the driving force of the drive unit 100 to the auxiliary machine 3 via the belt 4. The pulley 70 is provided on the internal combustion engine 9 (see FIG. 1 ) removed from the vehicle 1. Figure 6 ) is at the same position as the pulley (not shown).

[0051] It should be noted that when the internal combustion engine 9 is removed, the pulley 70 is not removed together with the internal combustion engine 9 but remains on the vehicle 1. When the pulley 70 is used when the drive unit 100 is installed, the pulley 70 constitutes a second power transmission mechanism.

[0052] Next, refer to Figure 4 and Figure 5 , the advantages of the drive unit 100 compared with the comparative example are described. Figure 4 is a block diagram of the unit. Figure 5 is a block diagram of a driving unit 200 as a unit of a comparative example.

[0053] like Figure 5 As shown, a drive unit 200 of the comparative example includes a rotary electric machine 10 , a speed reducer 120 as a speed reduction mechanism, a first shaft 30 , and a second shaft 40 .

[0054] The speed reducer 120 is a planetary gear mechanism having a sun gear 121, planetary gears 122, a planetary gear carrier 123, and a ring gear 124. In the speed reducer 120, the ring gear 124 is non-rotatably supported by the housing 150. The speed reducer 120 reduces the output torque of the rotary electric machine 10 input from the sun gear 121 via the first shaft 30, and outputs it downstream from the planetary gear carrier 123 via the second shaft 40. Thus, even when the drive unit 200 is used, each driving force can be output from both ends of the second shaft 40.

[0055] However, in drive unit 200, second shaft 40 is inserted into the inner circumference of first shaft 30. Therefore, first shaft 30 needs to be formed into a cylindrical shape having a through hole large enough to allow second shaft 40 to pass therethrough, and the outer diameter of rotating electrical machine 10 may increase in the entire radial direction.

[0056] In contrast, Figure 4 As shown, in the drive unit 100, although the size of the first direction (here, the height direction) in which the small-diameter gear 21 and the large-diameter gear 22 are arranged in parallel is larger than that of the drive unit 200, the size of the second direction (here, the width direction) as a prescribed direction intersecting (here, orthogonal) the first direction can be reduced to be smaller than that of the drive unit 200. Thus, a favorable design can be made in a case where the restriction in the first direction is loose and the restriction in the second direction is strict. Therefore, the size of the prescribed direction of the drive unit 100 can be reduced.

[0057] Below, refer to Figure 6 and Figure 7 , a method for manufacturing the vehicle 1 is described. Figure 6 This is a configuration diagram for explaining a first step of the method for manufacturing the vehicle 1 . Figure 7 This is a configuration diagram for explaining the second step of the method for manufacturing the vehicle 1 .

[0058] The manufacturing method of the vehicle 1 is used to manufacture the vehicle 1, which includes: a transmission 2, a belt 4, a drive wheel 5 connected to the downstream of the transmission 2, and an auxiliary machine 3 connected to the downstream of the belt 4, wherein the input portion (flywheel 60) of the transmission 2 and the input portion (pulley 70) of the belt 4 are coaxially arranged. The manufacturing method of the vehicle 1 includes a first step and a second step.

[0059] First, if Figure 6 As shown, in the first step, a drive unit 100 is prepared. As described above, the drive unit 100 includes: a rotating motor 10, a small diameter gear 21 connected to the downstream of the rotating motor 10, a large diameter gear 22 meshing with the small diameter gear 21, and a second shaft 40 connected to the downstream of the large diameter gear 22, the second shaft 40 having a first output end 40a and a second output end 40b, the rotating motor 10 and the small diameter gear 21 are arranged on the first axis C1, the large diameter gear 22, the second shaft 40, the first output end 40a, and the second output end 40b are arranged on the second axis C2, and the large diameter gear 22 is arranged between the first output end 40a and the second output end 40b.

[0060] By preparing the drive unit 100 in this way, it is possible to realize a coaxial state of the two power transmission mechanisms (the transmission 2 and the belt 4 ).

[0061] Furthermore, the method for manufacturing the vehicle 1 includes a step of removing the internal combustion engine 9 connected to the input portion of the transmission 2 and the input portion of the belt 4 at least before the second step.

[0062] That is, the drive unit 100 may be prepared after the internal combustion engine 9 is disassembled, or the drive unit 100 may be prepared in advance before the internal combustion engine 9 is disassembled.

[0063] Then, if Figure 7 As shown, in the second step, the drive unit 100 is mounted on the vehicle 1. At this time, the first output end 40a is connected to the input portion of the transmission 2, and the second output end 40b is connected to the input portion of the belt 4.

[0064] In the internal combustion engine 9, the input part of the transmission 2 and the input part of the belt 4 are usually coaxially arranged. In the oil-to-electric conversion of the vehicle 1 with the internal combustion engine 9 into an electric vehicle, the drive unit 100 with the above structure can be said to be an advantageous conversion method. It should be noted that conversion is nothing more than an act of reproduction, and the conversion method is a method of producing an article (manufacturing method).

[0065] In addition, since the internal combustion engine 9 is located in a longitudinally long space in the axial view, when manufacturing a petrol-powered EV, longitudinal restrictions are loose and lateral restrictions are strict. Therefore, in such a case, the drive unit 100 of this structure is very suitable for application.

[0066] The structure and effects of the present embodiment described above will be summarized and described.

[0067] (1) The drive unit 100 comprises: a rotating motor 10, a small diameter gear 21 connected to the downstream of the rotating motor 10, a large diameter gear 22 meshing with the small diameter gear 21, and a second shaft 40 connected to the downstream of the large diameter gear 22, the second shaft 40 having a first output end 40a and a second output end 40b, the rotating motor 10 and the small diameter gear 21 are arranged on a first axis C1, the large diameter gear 22, the second shaft 40, the first output end 40a, and the second output end 40b are arranged on a second axis C2, and the large diameter gear 22 is arranged between the first output end 40a and the second output end 40b.

[0068] According to this structure, although the size of the first direction in which the small diameter gear 21 and the large diameter gear 22 are arranged in parallel is enlarged, the size of the second direction (prescribed direction) intersecting the first direction can be reduced. As a result, a favorable design can be performed when the restrictions in the first direction are loose and the restrictions in the second direction are strict. Therefore, the size of the prescribed direction of the drive unit 100 can be reduced.

[0069] (2) The small-diameter gear 21 and the large-diameter gear 22 constitute the speed reducer 20 .

[0070] According to this structure, although the larger the maximum output torque of the rotating electric machine 10 is, the larger the size is, the torque of the rotating electric machine 10 is increased by the speed reducer 20 by providing the speed reducer 20 downstream of the rotating electric machine 10. Thus, the maximum output torque of the rotating electric machine 10 can be set smaller, and an option of reducing the size of the rotating electric machine 10 can be obtained.

[0071] (3) The vehicle 1 includes the drive wheels 5 connected downstream of the first output end 40a and the auxiliary machine 3 connected downstream of the second output end 40b, and the large-diameter gear 22 is located on the first output end 40a side.

[0072] Since the driver perceives the change in the movement of the drive wheel 5 as a change in the movement of the vehicle 1 during driving, the influence of the movement of the drive wheel 5 is very important. The change in the movement transmitted to the input main component (here, the transmission 2) of the first output terminal 40a is directly related to the change in the movement of the drive wheel 5. On the other hand, the change in the movement transmitted to the auxiliary machine 3 has no direct relationship with the change in the movement of the vehicle 1 felt by the driver during driving. Therefore, by setting the large diameter gear 22 at a position closer to the first output terminal 40a than the second output terminal 40b, the distance between the large diameter gear 22 and the first output terminal 40a can be shortened, thereby suppressing the influence of the twisting or bending of the second shaft 40, and reducing the change in the movement of the vehicle 1.

[0073] (4) A method for manufacturing a vehicle 1, the vehicle 1 comprising: a transmission 2, a belt 4, a drive wheel 5 connected downstream of the transmission 2, and an auxiliary machine 3 connected downstream of the belt 4, wherein an input portion (flywheel 60) of the transmission 2 and an input portion (pulley 70) of the belt 4 are coaxially arranged, the manufacturing method comprising: a first step of preparing a drive unit 100, the drive unit 100 comprising: a rotating electric machine 10, a small-diameter gear 21 connected downstream of the rotating electric machine 10, a large-diameter gear 22 meshing with the small-diameter gear 21, and a third step of connecting the large-diameter gear 22 to the downstream of the large-diameter gear 22. Two shafts 40, the second shaft 40 has a first output end 40a and a second output end 40b, the rotating motor 10 and the small diameter gear 21 are arranged on the first axis C1, the large diameter gear 22, the second shaft 40, the first output end 40a, and the second output end 40b are arranged on the second axis C2, and the large diameter gear 22 is arranged between the first output end 40a and the second output end 40b; the second process, which mounts the drive unit 100 in a manner that the first output end 40a is connected to the input part of the transmission 2 and the second output end 40b is connected to the input part of the belt 4.

[0074] According to this structure, although the size of the first direction in which the small diameter gear 21 and the large diameter gear 22 are arranged in parallel is enlarged, the size of the second direction (prescribed direction) intersecting the first direction can be reduced. As a result, a favorable design can be performed when the restrictions in the first direction are loose and the restrictions in the second direction are strict. Therefore, the size of the prescribed direction of the drive unit 100 can be reduced.

[0075] Furthermore, by preparing the drive unit 100 having such a structure, it is possible to realize a coaxial state of the two power transmission mechanisms (the transmission 2 and the belt 4 ).

[0076] (5) The method for manufacturing the vehicle 1 includes the step of removing the internal combustion engine 9 connected to the input portion of the transmission 2 and the input portion of the belt 4 at least before the second step.

[0077] According to this structure, in the internal combustion engine 9, the input part of the transmission 2 and the input part of the belt 4 are mostly coaxially arranged, and in the oil-to-EV conversion of the vehicle 1 with the internal combustion engine 9 into an electric vehicle, the drive unit 100 with the above structure can be said to be an advantageous conversion method. It should be noted that conversion is nothing more than an act of reproduction, and the conversion method is a method of producing an article (manufacturing method).

[0078] In addition, since the internal combustion engine 9 is located in a long space in the axial direction, when manufacturing a petrol-powered EV, longitudinal restrictions are loose and lateral restrictions are strict. Therefore, the drive unit 100 of this structure is very suitable for the above situation.

[0079] It should be noted that the drive unit 100 may be prepared after the internal combustion engine 9 is disassembled, or may be prepared in advance before the internal combustion engine 9 is disassembled.

[0080] Although the embodiment of the present invention has been described above, the above embodiment merely shows one application example of the present invention and is not intended to limit the technical scope of the present invention to the specific structure of the above embodiment.

[0081] For example, when it is desired to increase the output of the drive unit 100, the axial length of the rotary electric machine 10 can be increased, the axial length of the first housing 51 of the housing 50 can be increased, and the second shaft 40 can be extended. In this case, although the dimension of the first direction in which the small-diameter gear 21 and the large-diameter gear 22 are arranged in parallel is also enlarged, the dimension of the second direction (prescribed direction) intersecting the first direction can be reduced.

[0082] Description of Reference Numerals

[0083] 100 driving unit (unit); 1 vehicle; 2 transmission (first power transmission mechanism); 3 auxiliary machine; 4 belt (second power transmission mechanism); 5 driving wheel; 9 internal combustion engine; 10 rotating electric machine; 20 reducer (reduction mechanism); 21 small-diameter gear; 22 large-diameter gear; 40 second shaft (shaft); 40a first output end; 40b second output end; C1 first axis; C2 second axis.

Claims

1. A unit, characterized in that have: Rotating electrical machines; A first gear connected to the downstream of the rotating motor; a second gear meshing with the first gear; a shaft connected downstream of the second gear; The shaft has a first output end and a second output end, The rotating motor and the first gear are arranged on a first axis. The second gear, the shaft, the first output end, and the second output end are arranged on a second axis. The second gear is disposed between the first output end and the second output end.

2. The unit according to claim 1, characterized in that The first gear and the second gear constitute a speed reduction mechanism.

3. A vehicle equipped with the unit according to claim 1 or 2, wherein the vehicle has: a driving wheel connected to the downstream of the first output end; an auxiliary machine connected downstream of the second output terminal; The second gear is located at the first output end side.

4. A method for manufacturing a vehicle, comprising: manufacturing a vehicle having a first power transmission mechanism, a second power transmission mechanism, a drive wheel connected downstream of the first power transmission mechanism, and an auxiliary machine connected downstream of the second power transmission mechanism, wherein an input portion of the first power transmission mechanism and an input portion of the second power transmission mechanism are coaxially arranged, the method comprising: A first step, wherein a unit is prepared, wherein the unit comprises: a rotating motor, a first gear connected to a downstream of the rotating motor, a second gear meshing with the first gear, and a shaft connected to a downstream of the second gear, wherein the shaft has a first output end and a second output end, wherein the rotating motor and the first gear are arranged on a first axis, wherein the second gear, the shaft, the first output end, and the second output end are arranged on a second axis, and wherein the second gear is arranged to be sandwiched between the first output end and the second output end; The second step is to mount the unit in such a manner that the first output end is connected to the input portion of the first power transmission mechanism and the second output end is connected to the input portion of the second power transmission mechanism.

5. The method for manufacturing a vehicle according to claim 4, characterized in that: The method includes at least a step of removing the internal combustion engine connected to the input portion of the first power transmission mechanism and the input portion of the second power transmission mechanism before the second step.

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