Vehicle drive device

Abstract

Disclosed is a drive device for a vehicle, which is provided with: a rotating electric machine; a power transmission device that is disposed on one side of the rotating electric machine in the axial direction and transmits power from the rotating electric machine to the wheels; a wiring unit that electrically connects the rotating electrical machine and a power source; and a housing that accommodates the rotating electric machine and the power transmission device, the wiring portion includes a connection conductor from the rotating electric machine and a terminal device attached to the housing on one side in the axial direction of the rotating electric machine, and the terminal device includes a conductor portion at an end portion on the lower side of the connection conductor. The coupling portion between the conductor portion and the connection conductor is disposed radially inward of the stator core of the rotating electrical machine when viewed in the axial direction.

Description

Technical Field

[0001] The present disclosure relates to a vehicle drive device. Background Art

[0002] A technique is known in which a terminal device in the form of a terminal block is mounted from the outside of a case that accommodates the rotating electric machine and the power transmission device to electrically connect a power source to the rotating electric machine.

[0003] Patent Document 1: International Publication No. 2016 / 035476 Pamphlet

[0004] However, in the above-mentioned prior art, the conductor portion of the terminal device and the fastening portion of the connecting conductor from the rotating motor are located radially outside the stator core of the rotating motor when viewed along the axial direction, making it difficult to reduce the size of the vehicle drive device in a direction intersecting the axial direction. Summary of the invention

[0005] Therefore, in one embodiment, an object of the present disclosure is to achieve a reduction in size of a vehicle drive device in a direction intersecting the axial direction.

[0006] In one technical solution, a vehicle drive device is provided, which comprises:

[0007] Rotating electrical machines;

[0008] A power transmission device is arranged on one axial side of the rotating electric machine and transmits the power from the rotating electric machine to the wheels;

[0009] a wiring portion for electrically connecting the rotating electrical machine to a power source; and

[0010] A housing for accommodating the rotating electrical machine and the power transmission device;

[0011] The wiring portion includes: a connection conductor from the rotating electrical machine, and a terminal device attached to the housing on one side of the axial direction of the rotating electrical machine.

[0012] The terminal device includes a conductor portion at the end portion of the lower side of the connecting conductor.

[0013] A joint portion between the conductor portion and the connection conductor is arranged radially inward of a stator core of the rotating electrical machine when viewed in the axial direction.

[0014] In one aspect, according to the present disclosure, it is possible to reduce the size of the vehicle drive device in a direction intersecting the axial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic plan view showing a state in which a vehicle drive device is mounted in a vehicle.

[0016] Figure 2 This is a cross-sectional view of the main parts of a vehicle drive device.

[0017] Figure 2A It is a schematic diagram showing a vehicle drive device.

[0018] Figure 3 It is a plan view schematically showing the vehicle drive device of this embodiment.

[0019] Figure 4 It is a side view schematically showing the vehicle drive device of this embodiment.

[0020] Figure 5 It is along Figure 3 A cross-sectional view of a portion of line AA.

[0021] Figure 6 It is a four-sided view of the terminal device.

[0022] Figure 7 It is an explanatory diagram of the connection mode between the terminal device and the power line bus bar from the rotating electrical machine 1.

[0023] Figure 8 It is a side view schematically showing the vehicle drive device of this embodiment. DETAILED DESCRIPTION

[0024] Below, while referring to the attached Figure 1 The dimensional ratios in the drawings are merely examples and are not limited thereto. Also, for the sake of convenience of description, the shapes and the like in the drawings may be partially exaggerated.

[0025] In the following description, the Y direction (refer to Figure 4 etc.) corresponds to the up-down direction of the vehicle drive device 100 in the use state, that is, the up-down direction when the vehicle drive device 100 is configured according to the orientation in the use state. Moreover, the Y1 side and the Y2 side correspond to the upper side and the lower side along the Y direction. In addition, the up-down direction is not necessarily parallel to the vertical direction, as long as it has a dominant vertical direction component. In addition, the directions of the various components in the following description indicate the directions when they are assembled in the vehicle drive device 100. In addition, terms related to the size, configuration direction, configuration position, etc. of each component are concepts that include states with differences caused by errors (errors to the extent that can be allowed in manufacturing). A direction (refer to Figure 2 etc.) corresponds to the axial direction. Figure 2 In the A direction, the A1 side and the A2 side are defined. Figure 3 etc.) is a direction orthogonal to both the A direction and the Y direction. Figure 3 In the figure, an X1 side and an X2 side along the X direction are defined.

[0026] In this specification, "drive connection" refers to a state in which two rotating members are connected to be able to transmit a driving force (synonymous with torque), including a state in which the two rotating members are connected to rotate as a whole, or a state in which the two rotating members are connected via one or more transmission components to be able to transmit a driving force. As such a transmission component, various components (for example, shafts, gear mechanisms, belts, chains, etc.) that transmit rotation at the same speed or at a variable speed are included. In addition, as a transmission component, an engagement device (for example, a friction engagement device, a meshing engagement device, etc.) that selectively transmits rotation and driving force may also be included.

[0027] In this specification, "rotating electric machine" is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that performs the functions of both a motor and a generator as needed. In addition, in this specification, regarding the configuration of two components, "overlapping when viewed in a specific direction" means that when an imaginary straight line parallel to the line of sight is moved in directions orthogonal to the imaginary straight line, the area where the imaginary straight line intersects with both components exists in at least a portion. In addition, in this specification, regarding the configuration of two components, "overlapping of configuration areas in a specific direction" means that at least a portion of the configuration area in a specific direction of one component is included in the configuration area in a specific direction of another component.

[0028] Figure 1 It is a schematic diagram in a plan view showing a state in which the vehicle drive device 100 is mounted in the vehicle VC. Figure 2 It is a cross-sectional view of a main part of the vehicle drive device 100 . Figure 2A 1 is a schematic diagram showing a vehicle drive device 100 .

[0029] like Figure 1 as well as Figure 2A As schematically shown in FIG. 1 , the vehicle drive device 100 includes: a rotating electrical machine 1; a pair of output members 6, and a pair of wheels W (see FIG. 1 ). Figure 1 ) are respectively driven and connected; and a transmission mechanism 3 is used to transmit the driving force between the rotating electric machine 1 and the pair of output members 6. The vehicle drive device 100 also includes a housing 2 for accommodating the rotating electric machine 1. The housing 2 also accommodates a pair of output members 6 and the transmission mechanism 3. In addition, in a modified example, the housing 2 may also accommodate only one of the pair of output members 6. In addition, the vehicle drive device 100 can be applied to any vehicle having a rotating electric machine 1, such as an electric vehicle and a hybrid vehicle, and the driving method can also be applied to any vehicle such as a front-wheel drive vehicle and a rear-wheel drive vehicle.

[0030] One of the pair of output members 6, namely the first output member 61, is drivingly connected to one of the pair of wheels W, namely the first wheel W1, and the other of the pair of output members 6, namely the second output member 62, is drivingly connected to the other of the pair of wheels W, namely the second wheel W2. Figure 1 As shown, the vehicle VC equipped with the vehicle drive device 100 includes: a first drive shaft 63 that rotates integrally with the first wheel W1, and a second drive shaft 64 that rotates integrally with the second wheel W2. The first drive shaft 63 is connected to the first wheel W1, for example, via a constant velocity joint, and the second drive shaft 64 is connected to the second wheel W2, for example, via a constant velocity joint. In addition, the first output member 61 is connected to the first drive shaft 63 so as to rotate integrally with the first drive shaft 63, and the second output member 62 is connected to the second drive shaft 64 so as to rotate integrally with the second drive shaft 64.

[0031] The vehicle drive device 100 transmits the output torque of the rotary electric machine 1 to a pair of wheels W via a pair of output members 6, thereby causing the vehicle VC equipped with the vehicle drive device 100 to travel. That is, the rotary electric machine 1 is a driving force source for the pair of wheels W. The pair of wheels W is a pair of left and right wheels in the vehicle VC (for example, a pair of left and right front wheels, or a pair of left and right rear wheels). The rotary electric machine 1 may be, for example, an AC rotary electric machine driven by a three-phase AC.

[0032] like Figure 2A As shown, the rotating electric machine 1 and the pair of output members 6 are separately arranged on two axes parallel to each other (specifically, the first axis C1 and the second axis C2). Specifically, the rotating electric machine 1 is arranged on the first axis C1, and the pair of output members 6 are arranged on the second axis C2 different from the first axis C1. The first axis C1 and the second axis C2 are axes (imaginary axes) arranged parallel to each other. The transmission mechanism 3 is coaxial with the pair of output members 6 (that is, on the second axis C2) and has an output gear (ring gear) 30 drivingly connected to at least one of the pair of output members 6.

[0033] The rotating electrical machine 1 is, for example, an inner rotor type. The rotating electrical machine 1 has a stator core 11 (see Figure 4 ) is arranged radially inside the rotor (not shown) which is rotatable around the first axis C1.

[0034] The transmission mechanism 3 has a reduction mechanism 34 in the power transmission path between the rotating motor 1 and the output gear 30. The reduction mechanism 34 is arbitrary and may include a reduction mechanism using a counter gear, a reduction mechanism using a planetary gear, etc. In the present embodiment, as an example, the reduction mechanism 34 includes a planetary gear mechanism, and the reduction mechanism 34 is coaxially arranged with the rotating motor 1. The output gear (planetary carrier) 342 of the reduction mechanism 34 meshes with the output gear 30 of the differential gear mechanism 5 in the radial direction. Such a vehicle drive device 100 can have a compact structure consisting of two shafts (a first shaft C1 and a second shaft C2). In addition, in a modified example, the vehicle drive device 100 may also have three or more shafts.

[0035] In this embodiment, the speed reduction mechanism 34 is arranged coaxially with the rotating electrical machine 1 (ie, on the first axis C1) so as to be drivingly connected to the rotating electrical machine 1. In this embodiment, as an example, the rotor of the rotating electrical machine 1 and the sun gear 341 of the speed reduction mechanism 34 rotate integrally with the input member 16.

[0036] In addition, the transmission mechanism 3 further includes a differential gear mechanism 5. The differential gear mechanism 5 distributes the driving force transmitted from the rotating electrical machine 1 to a pair of output members 6. The differential gear mechanism 5 can be arranged coaxially (i.e., on the second axis C2) with the pair of output members 6. The differential gear mechanism 5 distributes the driving force transmitted from the rotating electrical machine 1 to the output gear 30 to the pair of output members 6. That is, the output gear 30 is drivingly connected to both the pair of output members 6 via the differential gear mechanism 5.

[0037] Next, refer to Figure 3 The following figures explain the wiring structure and the like of this embodiment.

[0038] Figure 3 FIG. 1 is a plan view schematically showing a vehicle drive device 100 according to the present embodiment. Figure 4 FIG. 1 is a side view schematically showing the vehicle drive device 100 of the present embodiment. Figure 3 In order to understand the elements disposed inside the inverter housing portion 24, the inverter cover member 203 covering the upper portion of the inverter housing portion 24 is omitted (see FIG. 2 ). Figure 2 as well as Figure 4 ). In addition, Figure 4 In order to understand the state in the motor housing chamber S1, the motor cover member 201 is omitted from illustration, and the rotor of the rotary electric machine 1 is also omitted from illustration.

[0039] Figure 5 It is along Figure 3 A cross-sectional view of a portion of line AA, with Figure 2 Corresponds to the Q5 department. Figure 6 These are four-sided views of the terminal device 90 . Figure 7 It is an explanatory diagram of the connection method between the terminal device 90 and the power line bus bar 89.

[0040] In addition, if Figure 3 As shown, as an example, the housing 2 is composed of a housing member 200, a motor cover member 201, a differential cover member 202, and an inverter cover member 203 (see Figure 2 as well as Figure 4 The housing member 200 forms a motor housing chamber S1, an inverter housing chamber S4, a transmission mechanism housing chamber, an output shaft housing chamber, etc. In addition, the joining method may be fastening by bolts or the like.

[0041] In this embodiment, the vehicle drive device 100 further includes an inverter device 70, a high voltage system wiring unit 80, and a low voltage system wiring unit 140. The inverter device 70 may be housed in the housing 2, or may be arranged at a separate position from the housing 2. In this embodiment, as an example, the inverter device 70 is arranged in the inverter housing unit 24 at the upper portion of the housing 2. Alternatively, Figure 3 as well as Figure 4 As shown, the inverter housing portion 24 is provided on the upper side of the transmission mechanism housing portion 22 and the output shaft housing portion 23 .

[0042] The inverter device 70 is electrically connected between the battery BA (including a power storage device such as a capacitor) and the rotating electric machine 1, and performs power conversion between DC power and AC power. The rotating electric machine 1 is electrically connected to the battery BA via the inverter device 70, receives power supply from the battery BA for power operation, or supplies power generated by the inertia force of the vehicle VC to the power storage device for storage.

[0043] The high-voltage wiring section 80 electrically connects the rotating electrical machine 1 and the battery BA. The high-voltage wiring section 80 includes a bus bar member 88 from the inverter device 70 , a power line bus bar 89 , and a terminal device 90 .

[0044] The bus bar component 88 is in the form of three plates corresponding to three phases, and may include a portion extending linearly in the axial direction. In addition, the bus bar component 88 may be arranged in the inverter housing portion 24. The end of the bus bar component 88 on the A direction A1 side is fastened to the terminal device 90 by a bolt BT1. A current sensor 889 is provided in the bus bar component 88. The current sensor 889 is provided for each phase, and generates an electrical signal corresponding to the magnitude of the current flowing through the bus bar component 88. The current sensor 889 may also be in the form of being integrated with the bus bar component 88 by resin molding or the like. In addition, in Figure 3 In the example shown, the terminal of the current sensor 889 is connected to the control substrate 72 (described later) on the X2 side.

[0045] The power line bus bar 89 may be in the form of three corresponding to three. The power line bus bar 89 extends from the coil end 12A on the A direction A2 side of the rotating electric machine 1 (see Figure 5 ) is led out. In addition, the power line bus bar 89 may extend to the A direction A2 side from the end surface of the stator core 11 of the rotating electrical machine 1 on the A direction A2 side. One end of the power line bus bar 89 is connected to the stator coil 12 (refer to Figure 5 ) is connected, and the other end is fastened to the terminal device 90 by a bolt BT2. In addition, the power line bus bar 89 can also be implemented as a structural element of the rotating electrical machine 1.

[0046] The terminal device 90 is attached to the case on the A direction A2 side of the rotating electrical machine 1 . The terminal device 90 electrically connects the bus bar member 88 and the power line bus bar 89 from the rotating electrical machine 1 .

[0047] like Figure 6 As shown, the terminal device 90 includes a conductor portion 92 , a fixing portion 94 , a first sealing portion 96 , and a second sealing portion 98 .

[0048] The conductor part 92 electrically connects the bus bar component 88 and the power line bus bar 89. Three conductor parts 92 are provided corresponding to the three phases. The conductor parts 92 can be arranged in an X direction. Figure 7 As shown, each conductor portion 92 is arranged in a manner such that the center of each conductor portion 92 is offset to the X1 side relative to the first axis C1, but may also be arranged in a manner such that the center of each conductor portion 92 is located on the first axis C1 or the center of each conductor portion 92 is offset to the X2 side relative to the first axis C1.

[0049] Each conductor portion 92 may extend in the vertical direction with a constant cross section (i.e., a constant cross section when cut with a plane perpendicular to the vertical direction). In this case, the cross-sectional shape of each conductor portion 92 may also be a rectangle or other shapes. In this embodiment, the size and shape of the cross section (cross section when cut with a plane perpendicular to the vertical direction) of each conductor portion 92 may be designed to form a screw hole 921 for a bolt BT1 described later.

[0050] Each conductor portion 92 is integrated with the fixing portion 94. Each conductor portion 92 extends in the up-down direction, with the upper portion exposed in the inverter housing chamber S4 of the inverter housing portion 24 and the lower portion exposed in the motor housing chamber S1. The conductor portion 92 preferably extends linearly in the up-down direction as a whole, or the portion in the motor housing chamber S1 as a whole extends linearly in the up-down direction. In this case, compared with a case where the portion in the motor housing chamber S1 of the conductor portion 92 is bent in the X direction or the A direction, the mounting hole 2A of the housing 2 for mounting the fixing portion 94 can be reduced (see Figure 5) The mounting hole 2A is a hole that allows the motor housing chamber S1 and the inverter housing chamber S4 to communicate with each other, and is blocked by the installation of the terminal device 90.

[0051] The bus bar member 88 is fastened to the upper end portion 920A of each conductor portion 92. Figure 6 As shown, each conductor part 92 has a screw hole 921 for fastening the busbar component 88 on the upper surface of the upper end 920A. The bolt BT1 is threadedly connected to the screw hole 921 for fastening through the bolt insertion hole at the end of the busbar component 88. Thus, the busbar component 88 is fastened to the upper part of the conductor part 92 in the up-down direction by the bolt BT1. In this case, each conductor part 92 itself becomes a bolt seat, thereby achieving space saving. In addition, it is not necessary to have other structures such as nuts, and the terminal device 90 can be miniaturized.

[0052] The power line bus bar 89 from the rotating electric machine 1 is fastened to the end 920B of the lower side of each conductor part 92 by a bolt BT2. The end 920B of the lower side of each conductor part 92 has a screw hole 922 for fastening with a bolt BT2 on the side facing the A direction A1 side. In this case, each conductor part 92 itself becomes a bolt seat, thereby achieving space saving. In addition, it is not necessary to have other structures such as nuts, and the terminal device 90 can be miniaturized.

[0053] In addition, the end 920B of the lower side of each conductor portion 92 can also be arranged at the same axial position relative to each other, and can also be offset in the axial direction. In addition, when the end 920B of the lower side of each conductor portion 92 is arranged at the same axial position, the size reduction of the main body 941 and the mounting hole 2A can be achieved.

[0054] Thus, according to the present embodiment, the fastening positions of the bolts BT1 and BT2 are respectively set on the upper surface of each linear conductor portion 92 and the side surface of the lower end portion 920B. Therefore, according to the present embodiment, compared with a comparative structure (not shown) in which the fastening positions of the bolts BT1 and BT2 are offset in a direction intersecting the up-down direction, the size of the vehicle drive device 100 in this direction can be reduced.

[0055] In addition, if Figure 4 As shown, the power line bus bar 89 has a fastening portion 892 extending radially inward at the coil end 12A on the A direction A2 side of the rotating electric machine 1. The fastening portion 892 is in a plate-like form and has a bolt insertion hole 8920. The fastening portion 892 of the power line bus bar 89 of each phase abuts against the side surface (the side surface facing the A direction A1 side) of the lower end 920B of each conductor portion 92 in a one-to-one relationship in the axial direction and is fastened in the axial direction by a bolt BT2. At this time, the bolt insertion hole 8920 (refer to Figure 5) can have an inner diameter that is relatively large relative to the outer diameter of the shaft portion of the bolt BT2. In the case of such tightening, even if the tolerance for positional deviation between each power line bus bar 89 and the lower end portion 920B of each conductor portion 92 becomes higher, and the allowable tolerance such as the allowable dimensional tolerance in the power line bus bar 89 is relatively loose, it is not easy to generate significant stress caused by the tightening of the bolt BT2.

[0056] In the present embodiment, when each conductor portion 92 is viewed in the axial direction, the lower end portion 920B is arranged at a position radially inward of the stator core 11 of the rotating electrical machine 1. That is, the joint portion (fastening portion) between each conductor portion 92 and the power line bus bar 89 from the rotating electrical machine 1 is arranged radially inward of the stator core 11 of the rotating electrical machine. Thus, the fastening operation between each conductor portion 92 and the power line bus bar 89 from the rotating electrical machine 1 can be performed with good workability by utilizing the space radially inward of the stator core 11.

[0057] More specifically, in the present embodiment, as described above, the terminal device 90 is arranged on the A direction A2 side of the rotary electric machine 1, that is, on the side opposite to the motor cover member 201 on the A direction A1 side. This arrangement is advantageous in that the distance to the bus bar member 88 arranged on the upper side of the transmission mechanism case portion 22 can be shortened (and the wiring length can be shortened accordingly). However, on the other hand, since it is axially away from the case opening covered by the motor cover member 201, the workability involved in tightening the bolt BT2 is easily reduced.

[0058] In contrast, in the present embodiment, the lower end 920B of each conductor portion 92 (i.e., the joint between each conductor portion 92 and the power line bus bar 89) is arranged radially inward of the stator core 11 of the rotating electrical machine 1 when viewed in the axial direction. Figure 4 As shown, in the state before assembling the rotor (not shown), when viewed in the axial direction, the lower end 920B of each conductor portion 92 and the bolt insertion hole 8920 of the power line bus bar 89 become visible (that is, the fastening portion involved in the bolt BT2 becomes visible). As a result, it is easy to insert a fastening tool in the axial direction toward the fastening portion, and the fastening operation between each conductor portion 92 and the power line bus bar 89 can be achieved with good workability.

[0059] The fixing portion 94 can be formed of, for example, a resin material. The fixing portion 94 holds each conductor portion 92. The fixing portion 94 is fastened to the housing 2 by a bolt BT3. The fixing portion 94 has a main body 941 and a leg 942. The main body 941 is inserted into and fitted into the mounting hole 2A of the housing 2. When viewed in the axial direction, the main body 941 has substantially the same shape as the mounting hole 2A of the housing 2, and is configured to block the mounting hole 2A. The leg 942 extends in the X direction in a continuous manner from both sides of the main body 941 in the X direction. A bolt insertion hole for the bolt BT3 to pass through is formed in each leg 942. In addition, the bolt BT3 can be threadedly connected to a screw hole (not shown) provided on the bottom wall portion 29 (the wall portion forming the above-mentioned mounting hole 2A) forming the inverter storage chamber S4 in the housing 2.

[0060] The first sealing portion 96 seals between the conductor portion 92 and the fixing portion 94. The first sealing portion 96 implements a sealing structure for oil in the terminal device 90. Specifically, the first sealing portion 96 prevents the intrusion of oil from between the conductor portion 92 and the fixing portion 94 in the terminal device 90 and from the motor housing chamber S1 into the inverter housing chamber S4. Thus, the possibility of oil in the motor housing chamber S1 leaking into the inverter housing chamber S4 can be reduced. The first sealing portion 96 is formed in accordance with each conductor portion 92 in a manner that surrounds the conductor portion 92 and is in close contact with the conductor portion 92 and the fixing portion 94. In addition, the first sealing portion 96 may also be integrally molded together with the fixing portion 94. In addition, in Figure 5 In the example shown, the first sealing portion 96 is provided only on a portion of the upper side of the vertical range of the conductor portion 92 surrounded by the fixing portion 94. However, the first sealing portion 96 may be provided on the entire vertical range of the conductor portion 92 surrounded by the fixing portion 94, or may be provided on the lower side.

[0061] The second sealing portion 98 seals between the outer periphery of the fixing portion 94 of the terminal device 90 and the housing 2. The second sealing portion 98 can be provided over the entire periphery of the fixing portion 94. The second sealing portion 98 surrounds the main body 941 of the fixing portion 94 and is in close contact with the main body 941 and the wall surface of the mounting hole 2A. The second sealing portion 98 can be formed of a rubber material, for example, and can be in the form of an O-ring. The second sealing portion 98 prevents the intrusion of oil through the mounting hole 2A (especially between the outer periphery of the fixing portion 94 and the housing 2) and prevents the intrusion of oil from the motor housing chamber S1 into the inverter housing chamber S4. Thus, the possibility of oil in the motor housing chamber S1 leaking into the inverter housing chamber S4 can be reduced.

[0062] Here, in this embodiment, the screw hole 921 for the bolt BT1 does not penetrate the conductor part 92 in the up-down direction, but is only opened on the upper side. In addition, the bolt BT2 extends as a whole to the motor storage chamber S1. Therefore, in this embodiment, there is no possibility of oil intrusion around the bolt BT1 and the bolt BT2 (intrusion into the inverter storage chamber S4), so there is no need to set up a sealing structure above the bolt BT1. As a result, compared with the case where a cover is set above the bolt BT1, the increase in size caused by the sealing structure can be reduced.

[0063] In other words, according to the present embodiment, by providing the screw hole 922 at the lower end 920B of each conductor portion 92 as described above, the bolt BT2 can be disposed entirely in the motor housing chamber S1. In addition, by extending each conductor portion 92 in the vertical direction, the screw hole 921 for the bolt BT1 can be a non-through type. Thus, there is no need to take measures against oil leakage through the bolt BT1 and the bolt BT2, and the sealing structure can be simplified.

[0064] The low-voltage system wiring unit 140 connects a plurality of low-voltage system components 144 (see Figure 8 ) is electrically connected to the control substrate 72. In addition, the low-voltage system wiring portion 140 may be in the form of a bundle of wire harnesses respectively connected to a plurality of low-voltage system components 144. The control substrate 72 extends between the inverter device 70 and the inverter cover member 203 in a manner covering the upper side of the inverter device 70.

[0065] The plurality of low-pressure system components 144 include a rotation angle detection device 150 (rotation angle sensor) described later, etc. Some examples of the low-pressure system components 144 will be described later.

[0066] The low-voltage system wiring section 140 includes: a wiring section wired in the inverter storage chamber S4 (hereinafter, also referred to as the "inverter-side low-voltage wiring section 141"), and a wiring section wired in the motor storage chamber S1 (hereinafter, also referred to as the "motor-side low-voltage wiring section 142"). The inverter-side low-voltage wiring section 141 and the motor-side low-voltage wiring section 142 are connected via a connector CN4. The connector CN4 is engaged with a through hole (a hole in the vertical direction) of the bottom wall portion 29 of the inverter storage chamber S4 (refer to Figure 3 ).

[0067] You can Figure 3 As shown, the inverter side low voltage wiring part 141 is arranged by using the space between the terminal device 90 of the high voltage system wiring part 80 and the side wall part 240 in the axial direction A in the inverter housing chamber S4. In this case, one end of the inverter side low voltage wiring part 141 may be connected to the connector CN4, and the other end may be fixed to the control substrate 72 via the connector CN2.

[0068] For details of the motor room side low voltage wiring portion 142, refer to the following Figure 8 The description is given below.

[0069] Next, refer to Figure 4 , the relationship between the preferred arrangement of the lower end portion 920B of each conductor portion 92 and other components that can be arranged radially inward of the stator core 11 when viewed in the axial direction will be described.

[0070] The lower end 920B of each conductor portion 92 is preferably disposed above the central axis (first axis C1) of the rotary electric machine 1. This can reduce the possibility or frequency of oil in the motor housing chamber S1 being applied to each conductor portion 92.

[0071] However, other structural elements other than the conductor parts 92 can be arranged at a position radially inward of the stator core 11 and on the A direction A2 side of the rotary electric machine 1 (particularly near the axial position of the terminal device 90) when viewed in the axial direction. Among such other structural elements, there may be structural elements preferably arranged at a position where oil is not easily applied in the motor housing chamber S1, that is, at a position above the central axis (first axis C1) of the rotary electric machine 1. For example, Figure 4 In the example shown, as an example of the other structural element, a rotation angle detection device 150 is provided. The rotation angle detection device 150 may be, for example, in the form of a rotary transformer arranged around the rotating axis of the rotary electric machine 1. The fixed side element of the rotation angle detection device 150 has an annular portion 152 and a fastening portion 154. The annular portion 152 extends around the central axis (first axis C1) of the rotary electric machine 1 at a position radially inward of the conductor portion 92. The fastening portion 154 is fastened to a wall portion of the housing 2 (for example, a wall portion extending in a plane intersecting the axial direction in a manner to separate the motor housing chamber S1 from the transmission mechanism housing chamber) by bolts BT4. For example, as Figure 4 As shown, a plurality of fastening portions 154 may also be provided at equal intervals in the circumferential direction. Figure 4 In the example shown, the fastening portions 154 are provided every 120 degrees. Unlike the annular portion 152, the fastening portions 154 extend to the radially outer side of the conductor portion 92. Therefore, the fastening portions 154 are arranged to be offset in the circumferential direction relative to the conductor portion 92. Thus, the lower end portion 920B of each conductor portion 92 and the rotation angle detection device 150 can be located at the radially inner side of the stator core 11 when viewed in the axial direction and on the A direction A2 side of the rotary electric machine 1.

[0072] In addition, from the viewpoint of ensuring the arrangement space of other structural elements such as the rotation angle detection device 150 as much as possible, it is preferable that the lower end 920B of each conductor portion 92 is arranged as far away from the central axis (first axis C1) of the rotating electrical machine 1 as possible at a position radially inward of the stator core 11 when viewed in the axial direction. Therefore, the lower end 920B of each conductor portion 92 may be arranged at a position radially inward of the stator core 11 when viewed in the axial direction, and at a position farthest from the central axis (first axis C1) of the rotating electrical machine 1 or at the uppermost position within a range of ensuring the required clearance between the tool for tightening the bolt BT2 and the inner peripheral surface of the stator core 11. This structure can be realized by making the lengths of the conductor portions 92 different. In other words, by making the lengths of the conductor portions 92 different, the arrangement space of other structural elements such as the rotation angle detection device 150 can be efficiently ensured at a position radially inward of the stator core 11 when viewed in the axial direction.

[0073] Next, refer to Figure 8 , the details of the motor room side low-voltage wiring portion 142 are described.

[0074] Figure 8 FIG. 1 is a side view schematically showing the vehicle drive device 100 of the present embodiment. Figure 8 In order to understand the state in the motor housing chamber S1, the motor cover member 201 is omitted from the illustration, and the rotor of the rotary electric machine 1 is also omitted from the illustration. Figure 8 In the figure, it is shown Figure 4 The motor room side low voltage wiring portion 142 is partially omitted in the figure. Figure 8 and Figure 4 In the embodiment, the shape and arrangement of the same structural elements are shown in a slightly different manner, but the difference is the same as that in the reference Figure 8 The description given later is irrelevant.

[0075] exist Figure 8 In FIG. 1 , among various components housed in the motor housing chamber S1 , components disposed between the rotary electric machine 1 and the partition wall 26 of the housing 2 in the axial direction A are mainly shown. Figure 8 , among the various components housed in the motor housing chamber S1, components that are disposed in the axial direction A between the rotary electric machine 1 and the transmission mechanism 3 (particularly the speed reduction mechanism 34) together with the partition wall 26 are shown. Figure 8 1, as a component of the rotating electrical machine 1, a power line bus bar 89 joined to the conductor portion 92 of the terminal device 90 is also shown. The power line bus bar 89 may be in the form of a module integrated by resin molding or the like, for example.

[0076] In this embodiment, the conductor portion 92 (and the power line bus bar 89) of the terminal device 90 of the high-voltage system wiring portion 80 and the motor room side low-voltage wiring portion 142 are arranged in the space S11 between the rotating electric machine 1 and the partition wall 26 in the axial direction A in the motor storage chamber S1 of the housing 2 (see Figure 2 ).

[0077] The motor housing chamber S1 has spaces S11 and S12 on both sides of the rotating electrical machine 1 in the axial direction A. The space S11 is located between the rotating electrical machine 1 and the partition wall 26 in the axial direction A, and the space S12 is located between the rotating electrical machine 1 and the motor cover member 201 in the axial direction A.

[0078] In this embodiment, the conductor part 92 of the terminal device 90 of the high-voltage wiring part 80 and the motor room side low-voltage wiring part 142 are concentratedly arranged in the space S11 of the spaces S11 and S12. As a result, the wiring length can be shortened compared to the case where the conductor part 92 of the terminal device 90 of the high-voltage wiring part 80 and the motor room side low-voltage wiring part 142 are dispersedly arranged in the spaces S11 and S12. That is, referring to Figure 3 As described above, each wiring can be led out from the upper side of the space S11 to the inverter housing chamber S4, and the length of the wiring to the inverter housing chamber S4 can be reduced.

[0079] In addition, in the present embodiment, the motor room side low voltage wiring portion 142 is arranged in a circumferential range different from the conductor portion 92 (and the power line bus bar 89) of the terminal device 90 in the circumferential range around the rotating electrical machine 1 when viewed in the axial direction. As a result, the motor room side low voltage wiring portion 142 and the conductor portion 92 (and the power line bus bar 89) of the terminal device 90 can be dispersedly arranged in a non-overlapping manner throughout the entire circumference around the rotating electrical machine 1 in the space S11. As a result, the required electrical insulation between the motor room side low voltage wiring portion 142 and the conductor portion 92 (and the power line bus bar 89) of the terminal device 90 can be ensured, and the size of the axial direction A of the space S11 can be minimized. That is, the increase in the size of the axial direction A of the space S11 due to the configuration of the motor room side low voltage wiring portion 142 in the space S11 can be avoided. In addition, compared with the case where a part or all of the motor room side low voltage wiring portion 142 is configured in the space S12, the size of the axial direction A of the space S12 can be reduced. As a result, according to the present embodiment, it is possible to shorten the length of the motor housing chamber S1 in the axial direction A.

[0080] In this embodiment, the conductor portion 92 of the terminal device 90 (and the power line bus bar 89) is preferably arranged above the axis of the rotating electrical machine 1 (= the rotation axis on the first axis C1) when viewed in the axial direction. Figure 8In the figure, line Lh is a straight line in the horizontal direction passing through the axis of the rotating electrical machine 1, and the conductor portion 92 of the terminal device 90 (and the power line bus bar 89) is preferably located above the line Lh as a whole. Thus, the wiring length between the terminal device 90 and the rotating electrical machine 1 can be minimized. In addition, in a modified example, only a portion of the power line bus bar 89 may be located below the line Lh.

[0081] In addition, in this embodiment, the motor room side low voltage wiring portion 142 is arranged over an angle range of 180 degrees around the axis of the rotating electrical machine 1 (on the first axis C1) and below the axis of the rotating electrical machine 1 when viewed in the axial direction. Specifically, the motor room side low voltage wiring portion 142 is in the form of a wiring harness having the above-mentioned connector CN4 at one end and three connectors CN11, CN12, and CN13 at the other end. Figure 3 As described above, the connector CN4 is disposed at the X1 side end portion of the inverter storage chamber S4. Figure 8 As shown in FIG. 1 , the end of the motor room side low voltage wiring portion 142 on the connector CN4 side is located on the X direction X1 side of the conductor portion 92 when viewed in the axial direction. Figure 8 In the view of FIG. 1 , the wiring portion 1421 passes through a position below the axis of the rotating electrical machine 1 in a clockwise direction, and branches into wiring portions 1421 and 1422 to the connectors CN11 and CN12 near the bottom of the motor housing chamber S1. The connector CN11 is connected to the above-mentioned rotation angle detection device 150 (an example of the low-pressure system component 144). The connector CN12 is connected to the oil temperature sensor 160. The oil temperature sensor 160 is an example of the low-pressure system component 144, and generates an electrical signal corresponding to the temperature of the oil passing through the bottom of the motor housing chamber S1. The remaining wiring portion 1423 of the motor chamber side low-voltage wiring portion 142 is further branched from the branch position involving the connectors CN11 and CN12. Figure 8The wiring portion 1423 is wired clockwise in the view of FIG. The wiring portion 1423 is terminated in such a manner that the connector CN13 is located at approximately the same height (Y direction position) as the axis of the rotating electrical machine 1. In addition, the connector CN13 is located on the X2 side relative to the axis of the rotating electrical machine 1. The connector CN13 is connected to a temperature sensor 162 (an example of a low-voltage system component 144). The temperature sensor 162 is, for example, in the form of a thermistor, and generates an electrical signal corresponding to the temperature of the rotating electrical machine 1. The temperature sensor 162 can be arranged near a portion of the rotating electrical machine 1 that is more likely to become high temperature (for example, the power line bus bar 89). In this case, the space portion (180 degrees around the axis) below the axis of the rotating electrical machine 1 in the space S11 can be effectively utilized to wire the motor room side low-voltage wiring portion 142. That is, the motor room side low-voltage wiring portion 142 can be efficiently arranged in the same space S11 as the conductor portion 92 of the terminal device 90 (and the power line bus bar 89).

[0082] In addition, Figure 8 In the example shown, the motor room side low voltage wiring portion 142 is clamped relative to the partition wall 26 by the clamp 143 at two locations across the branch positions involved in CN11 and CN12. Thus, it is possible to appropriately prevent vibration of the motor room side low voltage wiring portion 142. In addition, the number and arrangement of the clamps 143 are not limited to this, and other forms are also possible.

[0083] Although the embodiments are described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the claims. In addition, all or a plurality of the structural elements of the above-mentioned embodiments can be combined.

[0084] For example, in the above-mentioned embodiment, it is assumed that oil for cooling the rotating electrical machine 1 enters the motor housing chamber S1, but the motor housing chamber S1 may be a so-called dry space. That is, the rotating electrical machine 1 may be cooled by water. In this case, the first sealing portion 96 and the second sealing portion 98 may be omitted.

[0085] Furthermore, in the above-described embodiment, the vehicle drive device 100 includes the differential gear mechanism 5 in the housing 2 , but the differential gear mechanism 5 may be configured to be separate from the housing including the rotary electric machine 1 and the like.

[0086] Description of Reference Numerals

[0087] 100...vehicle drive device; 1...rotating electrical machine; 11stator core; 2...housing; 34...speed reduction mechanism (power transmission device); 70...inverter device; 80...high-voltage system wiring portion (wiring portion of high-voltage system); 88...busbar component; 89...power line busbar (connecting conductor from rotating electrical machine); 90...terminal device; 92...conductor portion; 920A...upper end portion; 920B...lower end portion; 921...screw hole; 922...screw hole; 94...fixing portion; 96...first sealing portion (sealing portion); 142...low-voltage wiring portion on the motor room side (wiring portion of low-voltage system); 150...rotation angle detection device; 152...annular portion; 154...fastening portion; S1...motor storage chamber (storage chamber).

Claims

1. A vehicle drive device, wherein: have: Rotating electrical machines; A power transmission device is arranged on one axial side of the rotating electric machine and transmits power from the rotating electric machine to wheels; A wiring section of a high voltage system electrically connects the rotating electrical machine to a power source; a housing for accommodating the rotating electrical machine and the power transmission device; as well as The wiring part of the low voltage system is arranged in the housing chamber for housing the rotating electrical machine in the housing. The wiring portion of the high-pressure system and the wiring portion of the low-pressure system are arranged in the accommodation chamber between the rotating electric machine and the power transmission device in the axial direction.

2. The vehicle drive device according to claim 1, wherein: The wiring portion of the low-voltage system is provided outside the rotating electrical machine and in a circumferential range around the rotating axis of the rotating electrical machine, different from the circumferential range of the wiring portion of the high-voltage system, when viewed in the axial direction.

3. The vehicle drive device according to claim 1, wherein: The wiring portion of the high-voltage system is arranged above the rotating shaft of the rotating electrical machine when viewed in the axial direction.

4. The vehicle drive device according to claim 1, wherein: The wiring portion of the low-voltage system is arranged over an angle range of 180 degrees below the rotation axis of the rotating electrical machine, around the rotation axis of the rotating electrical machine, when viewed in the axial direction.

5. The vehicle drive device according to claim 1, wherein: further comprising at least two low-pressure system components arranged in the housing chamber between the rotating electrical machine and the power transmission device in the axial direction, The wiring portion of the low-voltage system is electrically connected to the at least two low-voltage system components.

6. The vehicle drive device according to claim 1, wherein: The at least two low-pressure system components include at least two of a rotation angle sensor that generates an electrical signal corresponding to the rotation angle of the rotating motor, an oil temperature sensor that generates an electrical signal corresponding to the temperature of the oil in the storage chamber, and a temperature sensor that generates an electrical signal corresponding to the temperature of the rotating motor.

7. The vehicle drive device according to claim 1, wherein: The wiring section of the high-voltage system includes: a connection conductor from the rotating electrical machine, and a terminal device attached to the housing on one side of the axial direction of the rotating electrical machine. The terminal device includes a conductor portion at the end portion of the lower side of the connecting conductor. A joint portion between the conductor portion and the connection conductor is arranged radially inward of a stator core of the rotating electric machine when viewed in the axial direction.

8. The vehicle drive device according to claim 1, wherein: The wiring section of the high voltage system further includes a bus bar component that electrically connects the inverter device and the conductor section. The bus bar member is provided with a current sensor, the current sensor generating an electrical signal corresponding to the magnitude of the current flowing through the bus bar member. The conductor portion has a screw hole for fastening the bus bar member on an upper surface of an upper end portion.

9. The vehicle drive device according to claim 1, wherein: The conductor portion has a screw hole for fastening the connection conductor on a side surface facing the axial direction at the lower end portion.

10. The vehicle drive device according to claim 1, wherein: The terminal device further comprises: a fixing portion fixed to the housing; and The sealing portion seals between the conductor portion and the fixing portion.

11. The vehicle drive device according to claim 1, wherein: The conductor portion is provided for each phase of the rotating electric machine having a plurality of phases, and the conductor portion associated with one phase is different in length from the conductor portion associated with another phase.

12. The vehicle drive device according to claim 1, wherein: A rotation angle detection device is further provided, the rotation angle detection device including a rotation angle sensor generating an electrical signal corresponding to the rotation angle of the rotating electric machine, wherein the rotation angle detection device is arranged around the rotating shaft of the rotating electric machine on one side of the axial direction of the rotating electric machine, The rotation angle detection device comprises: an annular portion extending radially inwardly from the conductor portion when viewed in the axial direction; and a fastening portion formed continuously from the annular portion and fixed to the housing, The fastening portion is offset from the lower end of the conductor portion in a circumferential direction around a rotation axis of the rotating electrical machine.

13. The vehicle drive device according to any one of claims 7 to 12, wherein: The conductor portions are provided for each phase of the rotating electric machine of a plurality of phases and are in a linear form arranged in parallel in the up-down direction.

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