Vehicle drive system

Abstract

Disclosed is a vehicle drive device comprising: a rotary electric machine; a power transmission mechanism connected to an axial one-end side of a rotary shaft member of the rotary electric machine; a drive device; a housing member inside which a first housing chamber that houses the rotary electric machine and a second housing chamber that houses the power transmission mechanism are formed and which holds oil in the first housing chamber and in the second housing chamber; a rotation angle sensor which is provided on the axial one-end side of the rotary shaft member in the first housing chamber and which acquires rotation angle information on the rotary electric machine; a substrate that supports the rotation angle sensor; and a wire the electrically connects the rotation angle sensor and the drive device to each other, wherein the housing member has a first partition wall portion partitioning the first housing chamber and the second housing chamber from each other in the axial direction, the substrate extends along the first partition wall portion and is supported by the first partition wall portion in such a manner that the substrate abuts against the first partition wall portion in the axial direction, and the wire has a first-partition-wall-side connector portion on the side of the substrate that abuts against the first partition wall portion in the axial direction and on the upper side of the rotary shaft member.

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle drive system. [Background technology]

[0002] A known technique is to place a rotation angle sensor that acquires rotation angle information of a rotating electric machine at the end opposite to the output end of the rotating electric machine, and electrically connect the rotation angle sensor to a control device via wiring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 022105 Brochure Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional technology described above, a resolver chamber and a resolver cover are required for arranging the resolver, which increases the number of parts. In addition, when assembling the motor, it is necessary to first lay out the electrical wiring for the resolver, which can lead to problems such as reduced ease of assembling the motor.

[0005] Therefore, in one aspect, an object of the present disclosure is to reduce the number of parts related to a rotation angle sensor and to improve the ease of assembly of a rotating electric machine. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, there is provided a rotating electric machine having an axial direction intersecting a vertical direction; a power transmission mechanism connected to one axial end of a rotating shaft member of the rotary electric machine, the power transmission mechanism transmitting power based on rotational torque generated by the rotary electric machine to wheels; a drive device that drives the rotating electric machine; a housing member that defines therein a first housing chamber that houses the rotating electric machine and a second housing chamber that houses the power transmission mechanism, has a first partition wall that separates the first housing chamber and the second housing chamber in the axial direction, and holds oil in the first housing chamber and the second housing chamber; a rotation angle sensor mounted on a substrate supported by the first partition wall in the first accommodation chamber, the rotation angle sensor acquiring rotation angle information of the rotating electric machine; wiring that electrically connects the rotation angle sensor and the drive device; The wiring has a first bulkhead-side connector on a side of the board facing the first bulkhead in the axial direction and above the rotating shaft member. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to reduce the number of parts related to the rotation angle sensor and improve the ease of assembly of the rotating electric machine. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a skeleton diagram of a vehicle drive system including a rotating electric machine and a power transmission mechanism. [Figure 2] 1 is a cross-sectional view schematically showing a main part of a vehicle drive device. [Figure 2A] FIG. 3 is an enlarged view of a portion Q1 in FIG. 2. [Figure 3] 10 is a diagram schematically showing the inside of a gear accommodating chamber and an inverter accommodating chamber when the first partition wall is viewed from the X1 side in the X direction. FIG. [Figure 4] FIG. 4 is an explanatory diagram of a connector cover, and is an enlarged view of a portion Q2 in FIG. 3. [Figure 5] FIG. 2 is a schematic cross-sectional view illustrating a labyrinth structure of the connector. DETAILED DESCRIPTION OF THE INVENTION

[0009] Each embodiment will be described in detail below with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples and are not intended to limit the scope of the invention. In addition, shapes and the like in the drawings may be partially exaggerated for the sake of explanation.

[0010] In the following, first, a vehicle drive system 100 to which the vehicle drive device 17 according to this embodiment can be suitably applied will be described, and then the vehicle drive device 17 according to this embodiment will be described.

[0011] [Entire drive system] Fig. 1 is a skeleton diagram of a vehicle drive system 100 including a rotating electric machine 1 and a power transmission mechanism 7. In Fig. 1, an X direction and an X1 side and an X2 side along the X direction are defined. The X direction is parallel to the direction of a first axis A1 (hereinafter also referred to as the "axial direction").

[0012] The vehicle drive system 100 is mounted on a vehicle. The type of vehicle is arbitrary, and the vehicle may be a four-wheel vehicle or a vehicle with other wheels.

[0013] 1, the vehicle drive system 100 includes a rotating electric machine 1 that serves as a drive source for wheels W of the vehicle, and a power transmission mechanism 7 provided in a power transmission path connecting the rotating electric machine 1 and the wheels W. The power transmission mechanism 7 includes an input member 3, a counter gear mechanism 4, a differential gear mechanism 5, and left and right output members 6A, 6B.

[0014] The input member 3 has an input shaft 31 and an input gear 32. The input shaft 31 is a rotating member that rotates around the first axis A1. The input gear 32 is a gear that transmits rotational torque (driving force) from the rotating electric machine 1 to the counter gear mechanism 4. The input gear 32 is provided on the input shaft 31 of the input member 3 so as to rotate integrally with the input shaft 31 of the input member 3.

[0015] The counter gear mechanism 4 is disposed in the power transmission path between the input member 3 and the differential gear mechanism 5. The counter gear mechanism 4 has a counter shaft 41, a first counter gear 42, and a second counter gear 43.

[0016] The counter shaft 41 is a rotating member that rotates around the second axis A2. The second axis A2 extends parallel to the first axis A1. The first counter gear 42 is an input element of the counter gear mechanism 4. The first counter gear 42 meshes with the input gear 32 of the input member 3. The first counter gear 42 is connected to the counter shaft 41 so as to rotate integrally with the counter shaft 41.

[0017] The second counter gear 43 is an output element of the counter gear mechanism 4. In this embodiment, for example, the second counter gear 43 is formed to have a smaller diameter than the first counter gear 42. The second counter gear 43 is provided on the counter shaft 41 so as to rotate integrally with the counter shaft 41.

[0018] The differential gear mechanism 5 is disposed on a third axis A3, which serves as its rotation axis. The third axis A3 extends parallel to the first axis A1. The differential gear mechanism 5 distributes the driving force transmitted from the rotating electric machine 1 to left and right output members 6A and 6B. The differential gear mechanism 5 includes a differential input gear 51, which meshes with the second counter gear 43 of the counter gear mechanism 4. The differential gear mechanism 5 also includes a differential case 52, which houses a pinion shaft, pinion gears, left and right side gears, etc. The left and right side gears are connected to the left and right output members 6A and 6B so as to rotate integrally with them, respectively.

[0019] The left and right output members 6A, 6B are drivingly connected to the left and right wheels W, respectively. The left and right output members 6A, 6B transmit the driving force distributed by the differential gear mechanism 5 to the wheels W. Note that the left and right output members 6A, 6B may be composed of two or more members.

[0020] In this way, the rotating electric machine 1 drives the wheels W via the power transmission mechanism 7. However, in other embodiments, other speed reduction mechanisms such as a planetary gear mechanism may be used.

[0021] [Vehicle drive system] Fig. 2 is a cross-sectional view that schematically shows the main parts of the vehicle drive device 17. Fig. 2 defines the Z direction and the Z1 side and Z2 side along the Z direction. The Z direction is perpendicular to the axial direction and represents the up-down direction with the Z1 side being the upper side.

[0022] The vehicle drive device 17 includes a rotating electric machine 1, a power transmission mechanism 7, and a drive device 70, all of which are housed in a case 2.

[0023] The case 2 may be made of, for example, aluminum or the like. The case 2 can be formed by casting or the like. The case 2 includes a motor case 250, a motor cover 252, a gear case 254, and a gear cover 259.

[0024] The motor case 250 defines a motor housing chamber SP1 therein that houses the rotating electric machine 1. Note that forming the motor housing chamber SP1 inside means that the interior is at least partially surrounded by walls, and does not necessarily mean that the interior is completely closed by walls. This also applies to the other gear housing chambers SP2 and the like. The motor case 250 has a peripheral wall that surrounds the radial outside of the rotating electric machine 1. The motor case 250 is an integrally molded member, but may also be realized by joining multiple members together.

[0025] 2, the motor case 250 has a first partition wall 2500 that axially separates the motor housing chamber SP1 and the gear housing chamber SP2. The first partition wall 2500 faces a bottom portion 2521 (described later) of the motor cover 252 in the axial direction.

[0026] On the X1 side in the X direction of the first partition wall portion 2500, there are formed a coupling portion 2502 with the gear case 254, a bearing support portion 2504 that supports the bearing 241, and the like. The bearing support portion 2504 is formed in a central portion (a portion centered on the first axis A1) on the X1 side in the X direction of the first partition wall portion 2500 in a manner that protrudes toward the X1 side in the X direction. The bearing support portion 2504 is formed concentrically with the first axis A1 as its center.

[0027] The motor cover 252 is coupled to the X2 side of the motor case 250 in the X direction. The motor cover 252 is in the form of a cover that covers the X2 side of the motor housing chamber SP1 in the X direction. In this case, the motor cover 252 may cover the opening of the motor case 250 on the X2 side in the X direction so as to completely or almost completely block it. Note that a portion of the motor housing chamber SP1 on the X2 side in the X direction may be formed by the motor cover 252.

[0028] The motor case 250 includes an inverter case portion 250a, which defines an inverter accommodating chamber SP3 therein. The inverter accommodating chamber SP3 accommodates a drive device 70 that drives the rotating electric machine 1. The inverter accommodating chamber SP3 extends in the axial direction and is radially adjacent to the motor accommodating chamber SP1 and the gear accommodating chamber SP2. In this embodiment, the inverter accommodating chamber SP3 is disposed above the motor accommodating chamber SP1 and the gear accommodating chamber SP2 (on the Z-direction Z1 side). The motor case 250 also includes a second partition wall portion 2508 that radially separates the motor accommodating chamber SP1 and the gear accommodating chamber SP2 from the inverter accommodating chamber SP3. The second partition wall portion 2508 may be formed by a portion of the peripheral wall of the motor case 250.

[0029] The gear cover 259 is provided to cover the upper opening of the inverter accommodating chamber SP3. The gear cover 259 may be fastened to the upper part of the inverter case portion 250a with bolts or the like. In this way, the inverter case portion 250a cooperates with the gear cover 259 to form the inverter accommodating chamber SP3, which is a closed space. This makes it possible to appropriately implement EMC (Electromagnetic Compatibility) measures for the drive device 70 (particularly the inverter module 72 described below) and also to reduce problems such as spatial resonance.

[0030] The drive unit 70 includes an inverter module 72 and a controller 74 .

[0031] The inverter module 72 includes an inverter (not shown), which includes, for example, power switching elements (e.g., MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistors) and IGBTs (Insulated Gate Bipolar Transistors) on the high-potential side and low-potential side of the high-voltage battery Va for each phase, with the high-potential side power switching element and the low-potential side power switching element forming upper and lower arms. The inverter may include multiple pairs of upper and lower arms for each phase. Each power switching element may be PWM (Pulse Width Modulation) driven under the control of the control device 74 so as to generate a desired rotational torque. The high-voltage battery Va may be, for example, a battery with a relatively high rated voltage, such as a lithium-ion battery or a fuel cell.

[0032] In addition to the inverter, the inverter module 72 may include a member forming a cooling water passage, etc. The inverter accommodation chamber SP3 may also accommodate a smoothing capacitor, etc.

[0033] The control device 74 controls the vehicle drive device 17. For example, the control device 74 controls the rotating electric machine 1 via an inverter. In this embodiment, the control device 74 also controls an electric oil pump 90.

[0034] The control device 74 includes a control board 741. On the control board 741, various electronic components for the inverter, such as a microcomputer (microcontroller) 7412 for the inverter and a power supply circuit 7413, are mounted. In this embodiment, various electronic components (for example, an inverter, a microcomputer, etc.) for the electric oil pump 90, which will be described later, are also mounted on the control board 741. Note that the control board 741 may be realized by a plurality of boards.

[0035] 2, the inverter module 72 is disposed closer to the X2 side in the X-direction than the control board 741 of the control device 74. In other words, the control board 741 extends closer to the X1 side in the X-direction than the inverter module 72. Specifically, the inverter module 72 overlaps only the motor accommodating chamber SP1 when viewed in the radial direction, whereas the control board 741 overlaps the gear accommodating chamber SP2 when viewed in the radial direction. This shortens the wiring length between the relay connector CN1 (described later) and the control board connector CN2 of the control board 741 (control device 74), thereby achieving efficient wiring.

[0036] Furthermore, by extending the control board 741 further toward the X1 side in the X-direction than the inverter module 72, the low-voltage wiring and circuit elements can be separated from the high-voltage wiring and circuit elements in the X-direction. Specifically, in the inverter accommodating chamber SP3, most or all of the low-voltage wiring and circuit elements can be arranged on the X1 side in the X-direction, and most or all of the high-voltage wiring and circuit elements can be arranged on the X2 side in the X-direction. This makes it easier to ensure the insulation distance that should be ensured between the low-voltage wiring and circuit elements and the high-voltage wiring and circuit elements.

[0037] In this embodiment, the low-voltage external connector CN3 may be arranged on a side surface of the inverter case 250a on the X1 side in the X-direction, and the high-voltage external connector CN6 may be arranged on a side surface of the inverter case 250a on the X2 side in the X-direction. This allows the low-voltage external connector CN3 and the high-voltage external connector CN6 to be arranged in accordance with the positional relationship between the wiring and circuit elements of the low-voltage system and the wiring and circuit elements of the high-voltage system.

[0038] The control board 741 preferably has a control board connector CN2 at its end on the X1 side in the X-direction. In this embodiment, as shown in FIG. 2, the control board connector CN2 is provided at a position overlapping the gear accommodating chamber SP2 in a radial view. This allows the wiring lengths of the wires L120 and L122 between the relay connector CN1 (described later) and the control board connector CN2 to be shortened. Furthermore, the wiring length of the wire L130 between the low-voltage external connector CN3 and the control board connector CN2 can be shortened. In this embodiment, the wires L120 and L122 between the relay connector CN1 and the control board connector CN2 and the wire L130 between the low-voltage external connector CN3 and the control board connector CN2 extend further toward the X1 side in the X-direction than the control board connector CN2. This allows the insulation distances of the various wires in the low-voltage system (insulation distances from the high-voltage system) to be efficiently secured.

[0039] The motor cover 252 is provided with a bearing 240 that rotatably supports the rotor 310. That is, the motor cover 252 has a bearing support portion 2524 that supports the bearing 240.

[0040] 2, bearing 240 is provided radially outward from the end portion on the X2 side of rotor shaft 314. Specifically, bearing 240 has an outer race supported at the radially outer side by motor cover 252, and an inner race supported at the radially inner side by the outer peripheral surface of rotor shaft 314. In a modified example, bearing 240 may have an inner race supported at the radially inner side by motor cover 252, and an outer race supported at the radially outer side by the inner peripheral surface of rotor shaft 314.

[0041] 2, the motor cover 252 includes a circular bottom 2521 centered on the first axis A1, and a peripheral wall 2522 protruding from the outer periphery of the bottom 2521 toward the X1 side in the X-direction, and the end face of the peripheral wall 2522 on the X1 side in the X-direction is joined to the motor case 250. A cylindrical bearing support 2524 protruding toward the X1 side in the X-direction is formed in a central portion of the bottom 2521 on the X1 side in the X-direction (a portion centered on the first axis A1). The bearing support 2524 is formed concentrically about the first axis A1.

[0042] 2, an axial protruding portion 2525 is formed at the center of the bottom portion 2521 on the X1-direction side (the portion centered on the first axis A1) radially inward of the cylindrical bearing support portion 2524. The axial protruding portion 2525 is formed at the center of the bottom portion 2521 on the X1-direction side (the portion centered on the first axis A1) in a manner that protrudes toward the X1-direction side. A first oil passage 81 and a second oil passage 82 that supply oil to the hollow interior 314A (axial oil passage 83) of the rotor shaft 314 may be formed in the axial protruding portion 2525. Oil may be supplied to the first oil passage 81 and the second oil passage 82 from an electric oil pump 90.

[0043] The electric oil pump 90 may be disposed in the gear accommodating chamber SP2, for example, as shown in FIG. 2. In the present embodiment, as an example, the electric oil pump 90 is fixed to the first partition wall portion 2500, as shown in FIG. 2. The electric oil pump 90 may be disposed below the input shaft 31. The electric oil pump 90 may also be disposed in a position overlapping with the countershaft 41 when viewed in the up-down direction (see FIG. 3). An oil temperature sensor 92 may be disposed near the electric oil pump 90.

[0044] The gear case 254 defines a gear accommodating chamber SP2 therein that accommodates the power transmission mechanism 7. The gear accommodating chamber SP2 is an oil-tight space that communicates with the motor accommodating chamber SP1. That is, the gear accommodating chamber SP2, together with the motor accommodating chamber SP1, form an oil-tight space that contains oil for cooling and / or lubricating the rotating electric machine 1 and the power transmission mechanism 7. The gear case 254 is coupled to the motor case 250 on the X1 side in the X direction. In this embodiment, the gear case 254 is coupled to the motor case 250 in a manner that the gear case 254 abuts against the mating surface 2502A of the coupling portion 2502 of the first partition wall portion 2500 in the axial direction. The gear case 254 is in the form of a cover that covers the X1 side of the gear accommodating chamber SP2 in the X direction. The gear case 254 may be realized by coupling multiple members together. 2, the gear case 254 is in the form of a cover, but may have a peripheral wall that is relatively long in the X direction while still functioning as a cover and that surrounds the radially outer side of the power transmission mechanism 7. In this case, a portion of the gear accommodating chamber SP2 on the X2 side in the X direction may be formed by the motor case 250, as shown in FIG.

[0045] The rotor 310 includes a rotor core 312 and a rotor shaft 314 .

[0046] Rotor core 312 may be made of, for example, annular laminated steel plates made of magnetic material. Permanent magnets (not shown) may be embedded inside rotor core 312. Alternatively, permanent magnets (not shown) may be attached to the outer circumferential surface of rotor core 312. The arrangement of permanent magnets (not shown) is optional. Rotor core 312 is fixed to the outer circumferential surface of rotor shaft 314 and rotates integrally with rotor shaft 314.

[0047] The rotor shaft 314 defines a first axis A1, which is the rotation axis of the rotating electric machine 1. The rotor shaft 314 is rotatably supported by the motor cover 252 via a bearing 240 on the X2 side of the portion to which the rotor core 312 is fixed. The rotor shaft 314 is also rotatably supported by a first partition wall portion 2500 of the motor case 250 via a bearing 241 on the X1 side of the X direction of the rotating electric machine 1. In this way, the rotor shaft 314 may be rotatably supported by the case 2 at both axial ends.

[0048] In this embodiment, rotor shaft 314 supports bearing 241. Rotor shaft 314 abuts against the X2 side of the inner race (inner ring) of bearing 241 in the axial direction. Rotor shaft 314 bears the thrust load toward the X2 side in the X direction via the inner race of bearing 241. Rotor shaft 314 cooperates with first partition wall portion 2500 of case 2 to form an annular space into which bearing 241 is fitted.

[0049] The rotor shaft 314 is coupled to the input shaft 31 on the X1 side in the X direction so as to be able to transmit power. In this embodiment, as an example, a spline 31461 is formed on the inner peripheral surface of the rotor shaft 314, and is spline-fitted to a spline 3162 formed on the outer peripheral surface of the input shaft 31 so as to mesh with the spline 31461.

[0050] The rotor shaft 314 is, for example, in the form of a hollow tube and has a hollow interior 314A. The hollow interior 314A may extend over the entire axial length of the rotor shaft 314. In this embodiment, as an example, the inner circumferential surface of the rotor shaft 314 has a constant inner diameter except for the section where the spline 31461 is formed. However, in other embodiments, the rotor shaft 314 may have a reduced diameter at both axial ends or one end, in which case the inner circumferential surface of the rotor shaft 314 may have a reduced inner diameter at both axial ends or one end.

[0051] The hollow interior 314A of the rotor shaft 314 may function as the axial oil passage 83. That is, oil may be supplied to the hollow interior 314A via the first oil passage 81 and the second oil passage 82 of the motor cover 252. In this case, cooling the rotor shaft 314 makes it possible to cool the rotor core 312 (and the permanent magnets, if any) from the radially inner side.

[0052] An oil reservoir dam portion 89 may be formed in hollow interior 314A of rotor shaft 314. That is, rotor shaft 314 may have, on its inner circumferential surface, dam portion 89 that protrudes radially inward over the entire circumferential direction. In the example shown in Fig. 2, dam portion 89 is formed by, for example, an annular plug that is fitted into hollow interior 314A of rotor shaft 314.

[0053] The rotor shaft 314 may be formed with radial oil holes 831A and 831B for discharging oil to the coil end portions 322A and 322B of the stator 320, respectively.

[0054] Oil hole 831A may have an opening that faces coil end portion 322A in the radial direction, and may supply oil from inside axial oil passage 83 toward coil end portion 322A. Note that, although oil hole 831A extends linearly parallel to the radial direction in the example shown in Fig. 2, it may also extend linearly in an oblique direction that is slightly inclined relative to the radial direction.

[0055] Oil hole 831B may have an opening that faces the coil end portion 322B in the radial direction, and may supply oil from inside axial oil passage 83 toward coil end portion 322B. Note that, although oil hole 831B extends linearly parallel to the radial direction in the example shown in Fig. 2, it may also extend linearly in an oblique direction that is slightly inclined relative to the radial direction.

[0056] The stator 320 includes a stator core 321 and a stator coil 322 .

[0057] Stator core 321 may be made of, for example, laminated steel plates of a circular magnetic material. Teeth (not shown) are formed radially on the inner periphery of stator core 321, protruding radially inward.

[0058] The stator coil 322 may be, for example, a conductor having a rectangular or circular cross section and an insulating coating applied thereto. The stator coil 322 is wound around teeth (not shown) of the stator core 321. Note that, for example, one or more stator coils 322 may be electrically connected in a Y-connection or a Delta-connection in parallel.

[0059] Stator coil 322 has coil end portions 322A and 322B that protrude axially outward from the slots of stator core 321. Coil end portion 322A is located on the X1 side, and coil end portion 322B is located on the X2 side.

[0060] The power transmission mechanism 7 is disposed in the gear accommodating chamber SP2. Since the components of the power transmission mechanism 7 are as described above with reference to Fig. 1, the same reference numerals are used in Fig. 2 and the description will be omitted where appropriate.

[0061] In this embodiment, a parking gear 36 of a parking lock mechanism is attached to the input shaft 31 of the power transmission mechanism 7. The parking lock mechanism includes a mechanism (not shown) that switches the parking gear 36 between a rotatable state and an unrotatable state (locked state).

[0062] The parking gear 36 is a rotating member that rotates about the first axis A1. The parking gear 36 is connected to the input shaft 31 of the input member 3 so as to rotate integrally with the input shaft 31 of the input member 3. The parking gear 36 is disposed between the input gear 32 and a bearing 241 in the axial direction. The input shaft 31 is rotatably supported by a gear case 254 via a bearing 242 on the X1 side in the X direction.

[0063] Here, with further reference to FIG. 2, the wiring structure of this embodiment will be described with reference to FIGS. 2A and 3. FIG. 2A is an enlarged view of portion Q1 in FIG. 2. FIG. 3 is a diagram schematically illustrating the interior of the gear accommodating chamber SP2 and the inverter accommodating chamber SP3 when the first partition wall portion 2500 is viewed from the X1 side in the X direction. In FIG. 2, of the wiring structure of this embodiment, low-voltage system wiring is schematically indicated by dotted lines L100 to L140, and high-voltage system wiring is indicated by hatched rectangular lines L200 to L220. Note that each of the dotted lines L100 to L140 and the rectangular lines L200 to L220 may represent multiple wirings. Furthermore, the paths of the dotted lines L100 to L140 and the rectangular lines L200 to L220 are shown schematically, and the details are arbitrary. Furthermore, the wiring and the like related to the dotted lines L100 to L140 may actually be supported by the case 2 as appropriate using clamps or the like. 2, the wirings associated with the dotted lines L100 to L140 are shown as viewed from the Y1 side of FIG.

[0064] The low-voltage wiring includes first wirings L100 and L120 that electrically connect the rotation angle sensor 60 and the drive device 70. The rotation angle sensor 60 acquires information (rotation angle information) related to the rotation angle of the rotating electric machine 1. The rotation angle sensor 60 is provided at the end of the rotating electric machine 1 on the X1 side in the X direction (the end on the gear accommodating chamber SP2 side). In this embodiment, the rotation angle sensor 60 is provided at the end of the rotor shaft 314 on the X1 side in the X direction, as shown in FIG. 2, for example. The rotation angle sensor 60 may be, for example, a resolver. In this case, a non-rotating portion (stator portion) of the rotation angle sensor 60 may be fixed to the first partition wall portion 2500, as shown in FIG. 2. Hereinafter, when referring to only one of the first wirings L100 and L120, it will be simply referred to as wiring L100 or wiring L120.

[0065] As shown in FIG. 2, the first wiring L100, L120 is routed from inside the motor accommodating chamber SP1 through the first partition wall portion 2500 to inside the gear accommodating chamber SP2, and from inside the gear accommodating chamber SP2 through the second partition wall portion 2508 to inside the inverter accommodating chamber SP3.

[0066] One end of the wiring L100 is electrically connected to the rotation angle sensor 60, and the other end is electrically connected to the relay connector CN1. In this embodiment, the rotation angle sensor 60 has a non-rotating portion (such as the coil portion 62) mounted on a substrate 61, and is supported by the first partition wall portion 2500 via the substrate 61.

[0067] 2A, the substrate 61 extends along the first partition wall 2500 and is supported by the first partition wall 2500 in a manner that the substrate 61 abuts against the first partition wall 2500 in the axial direction. The substrate 61 has, for example, an annular shape centered on the first axis A1 when viewed in the axial direction, and supports the coil unit 62 of the rotation angle sensor 60. Note that in the example shown in FIG. 2A, the substrate 61 is fixed to a portion of the first partition wall 2500 below the first axis A1 by an axial bolt 69 (see FIG. 2).

[0068] The wiring L100 has a connector CN7, and the section from the relay connector CN1 to the connector CN7 may be in the form of a harness. The wiring L100 also includes wiring (not shown) on the board 61 from the connector CN7. The board 61 may be in the form of a printed circuit board, in which case the wiring on the board 61 may be in the form of printed wiring. One end of the wiring on the board 61 is connected to the coil portion 62, and the other end is connected to the board-side connector portion CN7-1 of the connector CN7. The connector CN7 is composed of a board-side connector portion CN7-1 and a harness-side connector portion CN7-2. The connector CN7 is electrically connected by mating the board-side connector portion CN7-1 with the harness-side connector portion CN7-2. The board-side connector portion CN7-1 and the harness-side connector portion CN7-2 are mated with each other in a manner that allows them to be inserted and removed in the axial direction. In this embodiment, as an example, the board-side connector section CN7-1 is a male type and the harness-side connector section CN7-2 is a female type, but the reverse may also be true.

[0069] The connector CN7 is disposed above the first axis A1. For example, as shown in FIG. 2, the connector CN7 is disposed above the rotation angle sensor 60. This makes it possible to appropriately protect the connector CN7 from oil, as will be described later. The effect of this will be described in detail later.

[0070] Furthermore, the connector CN7 is provided on the X1 side in the X direction (the side facing or abutting the first partition wall portion 2500) of the substrate 61. This effectively reduces the possibility that oil in the motor accommodating chamber SP1 will get on the connector CN7.

[0071] In this case, the connector CN7 is preferably disposed in an axial through-hole 25008 formed in the first partition wall 2500. That is, the first partition wall 2500 has an axial through-hole 25008 formed therein, and the wiring L100 from the rotation angle sensor 60 is drawn through the through-hole 25008. This makes it possible to shorten the length of the wiring that passes from the rotation angle sensor 60 through the first partition wall 2500 (when drawn through the through-hole 25008 to the gear accommodating chamber SP2 side). Furthermore, by disposing the connector CN7 in the through-hole 25008, oil is less likely to get on the connector CN7, and the connector CN7 can be appropriately protected from oil. This effect will be described in detail later.

[0072] 2A, in this embodiment, the connector cover 27 is fixed to the side of the first partition wall portion 2500 facing the gear accommodating chamber SP2. The connector cover 27 overlaps the connector CN7 (the harness-side connector portion CN7-2 and the board-side connector portion CN7-1) when viewed in the axial direction. This makes it difficult for oil to get on the connector CN7, thereby enabling the connector CN7 to be appropriately protected from oil. The connector cover 27 preferably covers the entire connector CN7 and overlaps the entire connector CN7 when viewed in the axial direction, but it may also be provided so as to overlap only a portion of the connector CN7.

[0073] The wiring L100 is preferably routed from the relay connector CN1 to the harness-side connector CN7-2 in a form having a downwardly convex curved portion 94 (see also FIG. 4), as shown schematically in FIG. 3. The curved portion 94 reduces the flow of oil that may flow along the wiring L100 to the connector CN7.

[0074] 2, the relay connector CN1 has a function of relaying various wires between the gear accommodating chamber SP2 and the inverter accommodating chamber SP3. The relay connector CN1 is provided in a portion 25082 that radially divides the gear accommodating chamber SP2 in the second partition wall portion 2508. As shown in FIG. 3, the relay connector CN1 may be disposed on the Y1 side of the input shaft 31 (first axis A1) in the Y direction.

[0075] One end of the wire L120 is electrically connected to the relay connector CN1, and the other end is electrically connected to the control board connector CN2 of the control board 741. The control board connector CN2 may be electrically connected to the microcomputer 7412 via a printed circuit (not shown) on the control board 741. In this way, the rotation angle sensor 60 is electrically connected to the control device 74 via the wire L100, the relay connector CN1, the wire L120, and the control board connector CN2.

[0076] 2, the control board connector CN2 may be electrically connected to a host ECU (Electronic Control Unit) 99 via a low-voltage external connector CN3. Specifically, the control board connector CN2 and the low-voltage external connector CN3 are electrically connected by a wire L130, and the low-voltage external connector CN3 and the host ECU 99 are electrically connected by a wire L140. The wire L140 may include a bus based on a CAN (Controller Area Network), Ethernet (registered trademark), or the like.

[0077] In this embodiment, the wiring L120 is in the form of a bundle of multiple wirings, and electrically connects wiring from other electronic components in addition to the rotation angle sensor 60 from the relay connector CN1 to the control board connector CN2. The wiring L120, together with the wiring L122 described below, may be realized by a flexible board or the like.

[0078] In this way, according to this embodiment, the rotation angle sensor 60 is disposed at the end of the rotor shaft 314 on the X1 side in the X-direction, which allows for more efficient wiring than when the rotation angle sensor 60 is disposed at the end of the rotor shaft 314 on the X2 side in the X-direction.

[0079] Furthermore, because the first wiring lines L100, L120 are relayed at the relay connector CN1 provided in the second partition wall portion 2508, there is no need for them to pass outside the vehicle drive device 17 (an outside different from the motor accommodating chamber SP1, the gear accommodating chamber SP2, and the inverter accommodating chamber SP3), and as a result, there is no need for a special accommodating chamber for the rotation angle sensor 60. This eliminates the need for sealing materials, cover members, and the like that may be required when drawing wiring to the outside, thereby reducing the number of parts and ensuring good ease of assembly.

[0080] For example, when assembling the rotating electric machine 1 into the motor case 250 to which the relay connector CN1 is attached, the wiring L100 can be drawn into the gear accommodating chamber SP2 and connected to the relay connector CN1, making the assembly relatively easy. Also, because the wiring (such as the wiring L100) related to the rotation angle sensor 60 is concentrated on the X1 side of the first partition wall 2500, the rotating electric machine 1 can be assembled on the X2 side of the first partition wall 2500 without risk of interference with the wiring related to the rotation angle sensor 60. This improves the ease of assembly of the rotating electric machine 1. Also, the wiring related to the rotation angle sensor 60 (such as the wiring L100 on the X1 side of the first partition wall 2500) can be routed either before or after the assembly of the rotating electric machine 1, increasing the degree of freedom in assembly.

[0081] In this way, according to this embodiment, the first wirings L100, L120 related to the vehicle drive device 17 can be established with good assembly properties without substantially increasing the axial size of the vehicle drive device 17.

[0082] In this embodiment, the wiring of the low pressure system further includes a wiring L111 from a connector CN4 for the electric oil pump 90. The electric oil pump 90 is electrically connected to the control device 74 via the wiring L111.

[0083] One end of the wire L111 is electrically connected to the connector CN4, and the other end is electrically connected to the relay connector CN1. As shown in FIG. 3, the wire L111 may be routed in a manner that wraps around the underside of the input shaft 31. The wire L111, which is electrically connected to the relay connector CN1, is electrically connected to the control device 74 via the wire L120. In this way, the electric oil pump 90 is electrically connected to the control device 74 via the wire L111, the relay connector CN1, the wire L120, and the control board connector CN2.

[0084] In this embodiment, the wiring of the low-pressure system further includes a wiring L112 from the oil temperature sensor 92. The oil temperature sensor 92 detects the temperature of the oil discharged from the electric oil pump 90. The oil temperature sensor 92 supplies an electric signal corresponding to the oil temperature to the control device 74 via the wiring L112. The oil temperature sensor 92 may be provided near the electric oil pump 90 (near the discharge port of the electric oil pump 90). In this embodiment, the oil temperature sensor 92 is fixed to the first partition wall portion 2500 as shown in FIG. 2. The oil temperature sensor 92 may be provided below the input shaft 31 as shown in FIG. 2. The oil temperature sensor 92 may be provided on the Y1 side of the input shaft 31 in the Y direction as shown in FIG. 3. One end of the wiring L112 is electrically connected to the oil temperature sensor 92, and the other end is electrically connected to the relay connector CN1. The wiring L112, which is electrically connected to the relay connector CN1, is electrically connected to the control device 74 via a wiring L120. In this way, the oil temperature sensor 92 is electrically connected to the control device 74 via the wire L112, the relay connector CN1, the wire L120, and the control board connector CN2.

[0085] In this embodiment, the low-voltage system wiring further includes second wirings L113, L114, and L122 extending from the thermistor 93. The thermistor 93 is provided in the stator 320 (e.g., the stator coil 322). Hereinafter, when referring to only one or two of the second wirings L113, L114, and L122, they will be simply referred to as wiring L113, wiring L114, or wiring L122.

[0086] In this embodiment, the thermistor 93 is provided in the coil end portion 322B on the X2 side in the X-direction. In this case, the second wiring L113, L114 can be routed more easily than when the thermistor 93 is provided in the coil end portion 322A on the X1 side in the X-direction. That is, after the rotating electric machine 1 is assembled to the motor case 250, the second wiring L113, L114 can be easily routed by utilizing the opening on the X2 side of the motor case 250 in the X-direction.

[0087] One end of the wire L113 is electrically connected to the thermistor 93, and the other end is electrically connected to the intermediate connector CN5. As shown in FIG. 2, the intermediate connector CN5 is disposed in the motor accommodating chamber SP1, utilizing the space between the stator 320 and the motor case 250 in the radial direction.

[0088] One end (the end on the X2 side in the X-direction) of the wiring L114 is electrically connected to the intermediate connector CN5, and the other end (the end on the X1 side in the X-direction) is electrically connected to the relay connector CN1. The wiring L114 runs from the intermediate connector CN5 through the first partition wall portion 2500 to the motor accommodating chamber SP1, the gear accommodating chamber SP2, and is electrically connected to the relay connector CN1. In this case, the wiring L114 may pass through the first partition wall portion 2500 via an axial through-hole 25009 formed in the first partition wall portion 2500. The wiring L114 extends above the input shaft 31 (first axis A1) in the gear accommodating chamber SP2. When the intermediate connector CN5 is disposed above the first axis A1 and on the Y1 side of the first axis A1 in the Y-direction, the wiring L114 can be routed linearly with a relatively short length. In this way, the wire L114 electrically connected to the relay connector CN1 is electrically connected to the wire L122 at the relay connector CN1.

[0089] Similar to the wire L120 of the first wires L100 and L120 described above, the wire L122 has one end electrically connected to the relay connector CN1 and the other end electrically connected to the control board connector CN2 of the control board 741. In this way, the thermistor 93 is electrically connected to the control device 74 via the wire L113, the wire L114, the relay connector CN1, the wire L122, and the control board connector CN2.

[0090] In this way, according to this embodiment, all of the low-voltage wiring is collected in one relay connector CN1, and can be routed via the one relay connector CN1 to the inverter accommodating chamber SP3 through the second partition wall portion 2508. This allows for a more efficient configuration than when multiple relay connectors are used (for example, one relay connector each for the motor accommodating chamber SP1 and the gear accommodating chamber SP2).

[0091] Furthermore, according to this embodiment, all of the low-voltage system wiring is relayed at the relay connector CN1 provided in the second partition wall portion 2508, and therefore does not need to pass outside (an outside different from the motor accommodating chamber SP1, the gear accommodating chamber SP2, and the inverter accommodating chamber SP3) the vehicle drive device 17. This eliminates the need for sealing materials, cover members, and the like that would be required if wiring were to pass outside, ensuring good assembly ease.

[0092] In this way, according to this embodiment, all of the low-voltage wiring related to the vehicle drive device 17 can be established with good assembly ease without substantially increasing the axial size of the vehicle drive device 17.

[0093] The high-voltage wiring includes a bus bar (power line) L200 extending from the terminal portion 324 of the stator 320 to the terminal block 200 provided in the second bulkhead portion 2508, and a bus bar L210 extending from the terminal block 200 to the inverter module 72. The terminal portion 324 is electrically connected to an end portion of each phase of the stator coil 322 (an end portion of a crossover wire).

[0094] The terminal block 200 is provided in a portion 25081 of the second partition wall portion 2508 that radially divides the motor accommodating chamber SP1. The terminal block 200 may have a configuration in which the bus bars L200, L210 are integrated with a resin portion (not shown), for example. The bus bar L210 from the terminal block 200 is electrically connected to the inverter module 72 in the inverter accommodating chamber SP3. The bus bar L212 from the inverter module 72 is electrically connected to the high-voltage external connector CN6. The bus bar L220 from the high-voltage external connector CN6 is electrically connected to the high-voltage battery Va.

[0095] In this way, in this embodiment, the wiring of the high-voltage system is realized on the X2 side of the inverter accommodating chamber SP3 in the X-direction, which makes it easy to ensure a sufficient insulation distance between the wiring of the low-voltage system arranged on the X1 side in the X-direction as described above.

[0096] In this embodiment, as described above, the case 2 holds oil in the motor accommodating chamber SP1 and the gear accommodating chamber SP2 to cool and / or lubricate the rotating electric machine 1 and the power transmission mechanism 7. Hereinafter, the oil in the motor accommodating chamber SP1 and the gear accommodating chamber SP2 will also be simply referred to as "oil in the case 2."

[0097] When the vehicle is stationary in a horizontal position, the surface (upper surface) of the oil in the case 2 remains horizontal. Figures 2 and 3 show a line LL1 that follows the surface of the oil in the case 2 in such a steady state. Note that the height of the oil surface in the case 2 in the steady state may be adjusted as appropriate depending on the arrangement of the power transmission mechanism 7 and the like.

[0098] On the other hand, when the vehicle is positioned on a slope or is subjected to various types of acceleration while driving, the oil in case 2 sways, and the oil surface deviates from the horizontal line LL1. Figure 2 schematically shows lines LL2 and LL3 on the oil surface that can change when subjected to acceleration in the X direction (e.g., the lateral direction). As shown in Figure 2, the oil surface in case 2 tends to tilt (in the roll direction) around the longitudinal axis that passes through the center C1 of the vehicle in the X direction.

[0099] The center of case 2 in the X direction does not necessarily coincide with the center C1 of the vehicle in the X direction, but as shown schematically in Figure 2, an arrangement (mounting configuration) is likely to be adopted in which the end of rotor shaft 314 on the X1 side in the X direction is closer to the center C1 of the vehicle in the X direction than the end on the X2 side in the X direction. In such a mounting configuration, as can be seen from lines LL2 and LL3, the end of rotor shaft 314 on the X1 side in the X direction is less likely to be immersed in oil than the end on the X2 side in the X direction.

[0100] In this regard, according to this embodiment, as described above, the rotation angle sensor 60 is provided at the end of the rotating electric machine 1 on the X1 side in the X direction (the end on the gear accommodating chamber SP2 side), and therefore the substrate 61 and the connector CN7 are provided at the end of the rotor shaft 314 on the X1 side in the X direction. This makes it difficult for the connector CN7 to be immersed in oil even when the oil in the case 2 sways in the roll direction due to the attitude or behavior of the vehicle, etc.

[0101] 3 shows lines LL4 and LL5 on the oil surface that can change when subjected to acceleration in the Y direction (for example, the longitudinal direction). As shown in FIG. 3, the oil surface in case 2 tends to tilt (in the pitch direction) around the left-right axis that passes through the center C2 of the vehicle in the Y direction.

[0102] The center of Case 2 in the Y direction does not necessarily coincide with the center C2 of the vehicle in the Y direction, but as shown schematically in Figure 3, an arrangement (mounting configuration) is likely to be adopted in which the center C2 of the vehicle in the Y direction is within the extension range of Case 2 in the Y direction. In this mounting configuration, as can be seen from lines LL4, LL5 and lines LL10, LL11, the sectorial area defined by lines LL10, LL11 is unlikely to be immersed in oil. In this case, lines LL10, LL11 are lines that define the boundaries of the sectorial area within ±45 degrees from the first axis A1, when the point directly above the vertical direction (dash-dotted line LL20) passing through the first axis A1 is set to 0 degrees.

[0103] In this regard, according to this embodiment, the connector CN7 is disposed above the first axis A1, so it is easy to position the connector CN7 within the sectorial area defined by the lines LL10 and LL11. This makes it difficult for the connector CN7 to become immersed in oil even when the oil in the case 2 sways in the pitch direction due to the vehicle's attitude, behavior, etc.

[0104] In this way, according to this embodiment, even if the oil inside the case 2 sways due to the attitude or behavior of the vehicle, it is possible to realize an arrangement of the connector CN7 that is unlikely to be submerged in oil.

[0105] Next, the structure for protecting the connector CN7 against oil will be further described with reference to FIGS. 4 and 5 in addition to FIG. 2A.

[0106] Fig. 4 is an explanatory diagram of the connector cover 27, and is an enlarged view of part Q2 in Fig. 3. Fig. 5 is a schematic cross-sectional view illustrating the labyrinth structure of the connector CN7.

[0107] As described above, the connector cover 27 overlaps the connector CN7 when viewed in the axial direction. In FIG. 4, the connector CN7 is substantially entirely covered by the connector cover 27, with only a portion of the connector CN7 being visible. In the example shown in FIG. 4, the connector cover 27 is in the form of a bracket and is fixed to the first partition wall portion 2500 by bolts 274. In the example shown in FIG. 4, the connector cover 27 also has a clamp portion 270 that clamps a portion of the wiring L100, which is in the form of a harness. The clamp portion 270 clamps a portion of the wiring L100 that is closer to the harness-side connector portion CN7-2 than the lowest point of the curved portion 94. In this way, the connector cover 27 functions as a bracket that clamps a portion of the wiring L100 while also protecting the connector CN7 from oil.

[0108] Incidentally, in the gear accommodating chamber SP2, oil that accumulates in the lower part is scooped up during operation of the differential gear mechanism 5, and there is a risk that the scooped-up oil will directly splash onto the connector CN7. In addition, there is a risk that the scooped-up oil will flow downward along the surface of the first partition wall portion 2500 on the X1 side in the X direction and reach the connector CN7. There is also a risk that the scooped-up oil will flow along the wiring L100 in the form of a harness and reach the connector CN7.

[0109] In this regard, according to this embodiment, as described above, the connector cover 27 is preferably provided, and therefore, of the oil that is scooped up, the oil heading toward the connector CN7 is more likely to hit the connector cover 27. As a result, the possibility that the oil will directly splash onto the connector CN7 can be effectively reduced.

[0110] Furthermore, in this embodiment, as described above, the connector CN7 is preferably disposed within the through hole 25008 of the first partition wall portion 2500, which effectively reduces the possibility that oil will reach the connector CN7 along the surface on the X1 side in the X direction of the first partition wall portion 2500. In order to promote this effect, the connector CN7 may be disposed within the through hole 25008 in such a manner that the connector CN7 is entirely housed within the through hole 25008 (i.e., such that the harness-side connector portion CN7-2 and the like are not exposed on the gear accommodating chamber SP2 side when viewed in a direction perpendicular to the first axis A1).

[0111] Furthermore, in this embodiment, as described above, the wiring L100 is preferably routed in a form having the curved portion 94, which effectively reduces the possibility that oil will travel along the wiring L100 in the form of a harness and reach the connector CN7 (oil rising against gravity). To promote this effect, the wiring L100 may be routed so that the lowest point of the curved portion 94 is located below the connector CN7. Note that when the wiring L100 has the curved portion 94, the excess length of the wiring L100 becomes loose and is prone to vibration. However, according to this embodiment, the clamp portion 270 of the connector cover 27 can prevent the wiring L100 from vibrating.

[0112] In this way, according to this embodiment, not only can the connector CN7 be positioned so that it is less susceptible to oil, but the possibility of oil in the gear housing SP2 reaching the connector CN7 directly or via the wire L100 can also be reduced. As a result, it is possible to reduce the waterproofness of the connector CN7, and for example, it may be possible to adopt a non-waterproof connector CN7 that is commercially available at low cost. Note that a non-waterproof connector does not have a sealing rubber member at the mating portion and therefore does not have the sealing function of such a sealing rubber member.

[0113] However, instead of using a sealing rubber member, the connector CN7 may have a labyrinth structure as shown in Fig. 5. In this case, even if foreign matter (e.g., tiny metal pieces) that can be mixed into oil gets into the connector CN7, the possibility of the foreign matter reaching the electrical contacts can be reduced. Specifically, in the example shown in Fig. 5, the board-side connector part CN7-1 of the connector CN7 has comb-shaped protrusions 710 between the terminals 720. This efficiently ensures a creepage distance and effectively reduces the possibility of a short circuit caused by foreign matter.

[0114] Although each embodiment has been described in detail above, it is not limited to a specific embodiment, and various modifications and changes are possible within the scope of the claims. It is also possible to combine all or a plurality of components of the above-described embodiments. Furthermore, among the effects of each embodiment, the effects related to the dependent claims are additional effects that are distinct from the generic concept (independent claim). [Explanation of symbols]

[0115] 1 Rotating electric machine, 314 Rotor shaft (rotating shaft member), 2 Case (accommodating member), 2500 First partition wall portion, 25008 Through hole, 2508 Second partition wall portion, 27 Connector cover (cover member), 270 Clamp portion, 7 Power transmission mechanism, 17 Vehicle drive device, 60 Rotation angle sensor, 61 Circuit board, 70 Drive device, 94 Curved portion, L100, L120 First wiring (wiring), CN7 Connector (first partition wall side connector), CN1 Relay connector (second partition wall side connector), SP1 Motor housing (first housing chamber), SP2 Gear housing (second housing chamber), SP3 Inverter housing (third housing chamber)

Claims

1. a rotating electric machine having an axial direction intersecting the vertical direction; a power transmission mechanism connected to one axial end of a rotating shaft member of the rotary electric machine, the power transmission mechanism transmitting power based on rotational torque generated by the rotary electric machine to wheels; a drive device that drives the rotating electric machine; a housing member that defines therein a first housing chamber that houses the rotating electric machine and a second housing chamber that houses the power transmission mechanism, that has a first partition wall that separates the first housing chamber and the second housing chamber in the axial direction, and that retains oil within the first housing chamber and the second housing chamber; a rotation angle sensor mounted on a substrate supported by the first partition wall in the first accommodation chamber, the rotation angle sensor acquiring rotation angle information of the rotating electric machine; wiring that electrically connects the rotation angle sensor and the drive device; the wiring has a first bulkhead-side connector on a side of the substrate facing the first bulkhead in the axial direction and above the rotating shaft member, the first partition wall portion has a through hole passing through in the axial direction, the first bulkhead-side connector is at least partially disposed within the through-hole; a cover member fixed to the first partition wall portion in the second storage chamber, The cover member overlaps the first bulkhead-side connector when viewed in the axial direction.

2. A vehicle drive device as described in Claim 1, wherein the first bulkhead side connector is entirely positioned within the through hole.

3. The housing member further defines a third housing chamber therein for housing the drive device, and further includes a second partition wall portion radially separating the second housing chamber from the third housing chamber; the wiring is routed from a second bulkhead-side connector provided in the second bulkhead portion to the first bulkhead-side connector in a form having a curved portion that is convex downward, The vehicle drive device according to claim 1 , wherein the cover member has a clamp portion that clamps the wiring.

4. A vehicle drive device described in any one of claims 1 to 3, wherein the first bulkhead side connector is a non-waterproof type that does not have a sealing rubber member, and when viewed in the axial direction, when directly above the vertical direction passing through the rotating shaft member is set to 0 degrees, is positioned within a fan-shaped area within ±45 degrees centered on the rotating shaft member.

Images