Vehicle drive device

Abstract

To enable a shield member which inhibits leakage flux discharged from a motor from reaching a resolver to be provided in a case while avoiding interference between a gear and a bearing part.SOLUTION: A vehicle drive device includes a case which houses a motor and a resolver 4. A shield member 5 is disposed so as to extend in a radial direction in a space between a gap formed between a stator coil and a rotor of the motor and the resolver 4. The radial outer side of the shield member 5 is formed with a cutout part 51c for avoiding interference with a bearing part provided within the case.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle drive device mounted on a vehicle. [Background technology]

[0002] For example, Patent Document 1 discloses a drive motor as a drive device mounted on electric vehicles, hybrid vehicles, etc. The motor in Patent Document 1 is composed of a stator fixed to a case and a rotor rotatably disposed inside the stator. Inside the case, a drive gear fixed to the motor shaft and a resolver for detecting the rotation speed of the rotor shaft supporting the rotor are disposed. The resolver is located between the motor rotor and drive gear, and has a resolver stator, a resolver rotor, and a shielding member for suppressing leakage magnetic flux emitted from the motor coil ends. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5488127 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the motor rotor, resolver, and drive gear are arranged in this order, but depending on the layout, there is a risk that the gears and bearings may be positioned in a way that causes interference with the shielding member. This tendency is particularly pronounced when trying to shorten the axial dimension of the case. As a result, it is difficult to secure space for the shielding member, and measures to prevent leakage magnetic flux from the motor become an issue.

[0005] The present disclosure has been made in consideration of these points, and its purpose is to make it possible to provide a shielding member that prevents leakage magnetic flux emitted from the motor from reaching the resolver, inside the case while avoiding interference with gears and bearings. [Means for solving the problem]

[0006] To achieve the above object, one aspect of the present disclosure can be based on a vehicle drive device including a shaft, a motor that rotates the shaft, a resolver that detects the rotational state of the motor, and a shielding member that suppresses radiation of leakage magnetic flux from the motor to the resolver. The vehicle drive device further includes a case that houses the shaft, the motor, and the resolver. The shielding member is arranged to extend radially of the shaft in a space between a gap formed between a stator coil and a rotor of the motor and the resolver. A notch is formed on the radial outer side of the shielding member to avoid interference with a bearing or gear provided inside the case.

[0007] With this configuration, the shielding member can prevent leakage magnetic flux emitted from the gap formed between the stator coil and rotor of the motor from reaching the resolver. For example, if the shielding member is positioned in a way that causes interference between the shielding member and bearings or gears arranged inside the case in order to shorten the axial dimension of the case, the cutout portion formed in the shielding member prevents interference with the bearings or gears. Because the cutout portion is formed only in a portion of the shielding member, the shielding member's effectiveness in shielding leakage magnetic flux is hardly reduced.

[0008] The bearing portion may have a bearing and a bearing fixing portion for fixing the bearing in a predetermined position. When the bearing fixing portion is formed so as to approach the motor in the axial direction, the notch portion can be formed so as to avoid interference with the bearing fixing portion.

[0009] The shaft may be provided with a first gear, and a lower shaft may be provided below the shaft, the lower shaft having a second gear that meshes with the first gear. In this case, the bearing portion supports one axial end of the lower shaft, and the notch portion may be formed only in the lower portion of the shielding member.

[0010] The shielding member may include a first shielding plate portion disposed to extend radially of the shaft in a space between the gap formed between the stator coil and rotor of the motor and the resolver, and a second shielding plate portion extending from a radially inner edge of the first shielding plate portion in a direction approaching the rotor of the motor. This allows leakage magnetic flux emitted from the gap formed between the stator coil and rotor of the motor to be prevented from reaching the resolver by the first shielding plate portion and also by the second shielding plate portion, thereby enhancing the shielding effect of leakage magnetic flux emitted from the gap. In this case, the cutout portion may be formed in the first shielding plate portion. That is, by forming the cutout portion in a portion of the shielding member other than the second shielding plate portion, the second shielding plate portion can be formed into a circumferentially continuous ring-shaped portion, thereby enhancing the shielding effect of leakage magnetic flux.

[0011] The first shielding plate may be fastened to the case at a plurality of portions spaced apart in a circumferential direction of the shaft by a plurality of fastening members. In this case, the cutout portion can be formed at a portion spaced apart in a circumferential direction of the shaft from the fastening portion by the fastening members, thereby allowing the cutout portion to be formed without affecting the fastening portion. [Effects of the Invention]

[0012] As described above, by forming the notch in the shielding member, it is possible to avoid interference between the shielding member and the bearings or gears disposed inside the case. [Brief explanation of the drawings]

[0013] [Figure 1]FIG. 1 is a perspective view of a vehicle drive device as seen from the front. [Figure 2] FIG. 2 is a front view of the vehicle drive device. [Figure 3] FIG. 3 is a cross-sectional view of a portion of the vehicle drive device. [Figure 4] FIG. 4 is a diagram illustrating a schematic internal structure of the vehicle drive device. [Figure 5] FIG. 5 is an enlarged cross-sectional view showing the vicinity of the upper portion of the stator and rotor. [Figure 6] FIG. 6 is an enlarged cross-sectional view showing the vicinity of the lower portion of the stator and rotor. [Figure 7] FIG. 7 is a right side view of the resolver and the shielding member. [Figure 8] FIG. 8 is a perspective view of the resolver and the shielding member as viewed from the right side. [Figure 9] FIG. 9 is a cross-sectional view of the fastening portion between the resolver and the shielding member. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or its uses.

[0015] 1 and 2 show a vehicle drive system 1 according to an embodiment of the present invention. The vehicle drive system 1 is mounted on an automobile (not shown) and is a device for driving the drive wheels of the automobile. The automobile may be an electric automobile that runs solely on the power of a motor, or a hybrid automobile that runs using the power of both an internal combustion engine (engine) and a motor. The motor that generates the power to drive the drive wheels is a drive motor. The hybrid automobile may also be a plug-in hybrid that can be charged from an external power source. In this embodiment, a hybrid automobile will be described as the automobile equipped with the vehicle drive system 1. Therefore, as shown in FIG. 3, the automobile equipped with the vehicle drive system 1 also includes a drive battery 80 for supplying power to the motor 3, a control unit 90 for controlling the motor 3, and the like. However, these are well known and therefore will not be described in detail. The control unit 90 includes an inverter circuit and the like.

[0016] The vehicle drive device 1 is mounted, for example, in the engine compartment of an automobile. The engine compartment may be located in the front or rear of the automobile. As shown in each drawing, the front-rear direction and the left-right direction are defined. That is, based on the state in which the device is mounted in the engine compartment of the automobile, the side that is the front of the vehicle will be simply referred to as the front, the side that is the rear of the vehicle will be simply referred to as the rear, the side that is the left side of the vehicle will be simply referred to as the left, and the side that is the right side of the vehicle will be simply referred to as the right. The left-right direction is the vehicle width direction. These definitions of directions are provided merely for the convenience of explaining the embodiments and do not limit the present invention.

[0017] As shown partially in phantom lines in FIG. 2, an engine E is disposed to the right of the vehicle drive device 1 in the engine room. The crankshaft (not shown) of the engine E extends in the left-right direction, and the engine E is a so-called transversely mounted engine. The engine E and the vehicle drive device 1 are aligned side by side in the left-right direction, with the vehicle drive device 1 disposed on the left side of the engine E, and the left portion of the engine E and the right portion of the vehicle drive device 1 connected by a fastening member (not shown). Power output from the crankshaft of the engine E is input to the vehicle drive device 1. Note that the left-right positions may be reversed, and the direction in which the engine E and the vehicle drive device 1 are aligned is not particularly limited. In the case of an electric vehicle, the engine E is not mounted, so the engine room is called a motor room.

[0018] 3, the vehicle drive device 1 includes a shaft 2, a motor 3 that rotates and drives the shaft 2, a resolver 4 that detects the rotation state of the motor 3, a shielding member 5 that suppresses radiation of leakage magnetic flux from the motor 3 to the resolver 4, and a case A. The shaft 2, the motor 3, the resolver 4, and the shielding member 5 are disposed inside the case A, and therefore the case A is a member that houses the shaft 2, the motor 3, the resolver 4, and the shielding member 5. The shaft 2 extends in the left-right direction inside the case A, and therefore the axial direction of the crankshaft of the engine E coincides with the axial direction of the shaft 2 (indicated by the symbol B).

[0019] Case A includes a motor housing 10, a right cover member 20, and a left cover member 30. Shaft 2 is rotatably supported relative to case A. Motor housing 10, right cover member 20, and left cover member 30 are each made of a light alloy such as an aluminum alloy, and are highly rigid members. In this embodiment, right cover member 20 and left cover member 30 are located on the right and left sides, respectively, and are therefore named as such, but this is not limiting, and right cover member 20 may also be called a front cover member, and left cover member 30 may also be called a rear cover member. Right cover member 20 is a first cover member, and left cover member 30 is a second cover member.

[0020] The motor housing 10, the right cover member 20, and the left cover member 30 constitute a single case A. The right cover member 20 is located on the right side of the case A and constitutes the right portion of the case A, so the right cover member 20 can also be called the right-side component member. The left cover member 30 is located on the left side of the case A and constitutes the left portion of the case A, so the left cover member 30 can also be called the left-side component member. The motor housing 10 is located between the right cover member 20 and the left cover member 30 and constitutes the left-right intermediate portion of the case A, so the motor housing 10 can also be called the intermediate component member. The motor housing 10 is sandwiched between the right cover member 20 and the left cover member 30 in the left-right direction. The structure of the case A is not limited to the above-described structure and may include additional components.

[0021] 3, a first coupling mechanism 2a that is coupled to the crankshaft of the engine E is fixed to the right end of the shaft 2. The first coupling mechanism 2a is controlled by a control unit 90 and can be switched between a connected state in which the crankshaft of the engine E and the shaft 2 are connected and a disconnected state in which the crankshaft of the engine E and the shaft 2 are disconnected.

[0022] A second coupling mechanism 2b is fixed to the shaft 2 to the left of the first coupling mechanism 2a. The second coupling mechanism 2b is switchable between a connected state in which the motor 3 and the shaft 2 are connected and a disconnected state in which the motor 3 and the shaft 2 are disconnected, and is controlled by a control unit 90. When the second coupling mechanism 2b is in the connected state, the power of the motor 3 is transmitted to the shaft 2. By controlling the first coupling mechanism 2a and the second coupling mechanism 2b with the control unit 90, it is possible to output only the power of the engine E, output only the power of the motor 3, or output a combined power of the engine E and the motor 3. A conventionally known control method can be used for this. A transmission 2c is provided on the shaft 2 to the left of the second coupling mechanism 2b. The power of the engine E or the power of the motor 3 is input to the transmission 2c.

[0023] FIG. 4 is a diagram schematically illustrating the internal mechanism of the vehicle drive device 1, with the first coupling mechanism 2a and the second coupling mechanism 2b omitted in this diagram. A first gear 100 is provided in the middle of the shaft 2. The output of the transmission 2c is transmitted to the first gear 100. A lower shaft 101 is provided below the shaft 2, and this lower shaft 101 is also disposed inside the case A. The lower shaft 101 and the shaft 2 are parallel to each other. Both ends of the lower shaft 101 are rotatably supported inside the case A. A second gear 102 that meshes with the first gear 100 is provided in the middle of the lower shaft 101.

[0024] Furthermore, a final gear 103 is provided below the shaft 2. The final gear 103 is fixed to a gear carrier 104, which is rotatably supported inside the case A. The axis of the gear carrier 104 is parallel to the axis of the lower shaft 101. A third gear 105 that meshes with the final gear 103 is provided in the middle of the lower shaft 101.

[0025] Therefore, when the power of the engine E or the power of the motor 3 is output from the transmission 2c, it is transmitted to the second gear 102 via the first gear 100. Because the second gear 102 and the third gear 105 are fixed to the lower shaft 101, the rotational force transmitted to the second gear 102 is transmitted from the third gear 105 to the final gear 103, causing the gear carrier 104 to rotate. Because left and right drive shafts (not shown) are connected to the gear carrier 104 via a differential mechanism (not shown), the power of the engine E or the power of the motor 3 is transmitted from the drive shafts to the drive wheels (not shown).

[0026] As partially shown in FIG. 3, the right end (one axial end) of the lower shaft 101 is rotatably supported by a bearing unit 200. Although not shown, the left end (the other axial end) of the lower shaft 101 is rotatably supported by another bearing unit. The bearing unit 200 has a bearing 201 and a bearing fixing unit 202 for fixing the bearing 201 in a predetermined position. The bearing fixing unit 202 may be integrally molded with the case A, for example, or may be formed as a separate member from the case A and assembled to the case A. The bearing fixing unit 202 in this embodiment has a recessed shape that is open to the left, and the bearing 201 is inserted and assembled from this open portion.

[0027] The right side of the bearing fixing portion 202 is formed so as to approach the motor 3 in the axial direction. Specifically, the bearing fixing portion 202 has a bulging surface 202a that bulges out to the right in order to form a recess into which the bearing 201 can be inserted. The bulging surface 202a and the side surface of the motor 3 are positioned opposite each other.

[0028] The basic structure of the motor 3 may be a conventionally known one. That is, the motor 3 has a stator coil 3a and a rotor 3b. The stator coil 3a is made up of multiple coils arranged in an annular shape and is fixed to the inner surface of the case A. On the other hand, the rotor 3b includes multiple magnets and is fixed to the outer circumferential surface of the second coupling mechanism 2b while being disposed radially inside the stator coil 3a.

[0029] FIG. 5 is an enlarged view of the stator coil 3a and the rotor 3b near the upper portions thereof, and FIG. 6 is an enlarged view of the stator coil 3a and the rotor 3b near the lower portions thereof. As shown in FIGS. 5 and 6, the outer peripheral surface of the stator coil 3a and the inner peripheral surface of the rotor 3b are spaced apart in the radial direction, so that a predetermined gap (gap C) is formed between the outer peripheral surface of the stator coil 3a and the inner peripheral surface of the rotor 3b. As shown in FIG. 6, the bulging surface 202a of the bearing portion 200 faces the left side surface of the stator coil 3a and the left side surface of the rotor 3b, and is positioned so as to face the gap C formed between the stator coil 3a and the rotor 3b. In order to minimize the left-right dimension of the case A, the distance between the bearing portion 200 and the stator coil 3a and the rotor 3b is set narrow.

[0030] The resolver 4 has a resolver stator 40 and a resolver rotor 41. As shown in Fig. 7 and Fig. 8, the resolver stator 40 has a main body 40a made of an annular plate material and a sensor 40b fixed to the main body 40a. As shown in Fig. 5 and Fig. 6, the main body 40a is fixed to the case A and extends in the radial direction of the shaft 2. The radially outer portion of the main body 40a extends to the vicinity of the gap C formed between the stator coil 3a and rotor 3b of the motor 3.

[0031] The resolver rotor 41 is made of an annular plate material that is disposed radially inside the resolver stator 40. A radially inner portion of the resolver rotor 41 is fixed to the left side surface of the second coupling mechanism 2b. Therefore, the resolver rotor 41 is integrated with the rotor 3b of the motor 3 via the second coupling mechanism 2b, and rotates together with the rotor 3b.

[0032] A continuous uneven shape is formed in the circumferential direction on the radially outer portion of the resolver rotor 41. When the resolver rotor 41 is excited by AC current and rotated together with the rotor 3b of the motor 3, the sensor portion 40b of the resolver stator 40 detects changes in electromotive force. The rotational position of the rotor 3b of the motor 3 can be detected based on the uneven shape of the resolver rotor 41 and the change in the relative rotation angle of the sensor portion 40b. A conventionally known method can be used as the detection method for the resolver 4.

[0033] During rotation of the motor 3, leakage magnetic flux (indicated by arrow D in FIG. 5 ) is emitted from the gap C formed between the stator coil 3 a and the rotor 3 b. In this embodiment, the left-right dimension of the case A needs to be as short as possible, so the distance between the resolver 4 and the stator coil 3 a and the rotor 3 b is set short. Furthermore, the left-right dimension of the case A is also shortened by arranging the second coupling mechanism 2 b radially inside the resolver 4. Therefore, in the premise structure of this embodiment, the resolver 4 faces the gap C formed between the stator coil 3 a and the rotor 3 b in close proximity, and the leakage magnetic flux emitted from the gap C is likely to adversely affect the resolver 4. When the sensor unit 40 b of the resolver stator 40 detects a change in electromotive force, the leakage magnetic flux may be superimposed as noise on the detection signal.

[0034] In response to this, in this embodiment, a shielding member 5 is provided to prevent leakage magnetic flux emitted from the gap C formed between the stator coil 3a and the rotor 3b from adversely affecting the resolver 4. The shielding member 5 is made of a non-magnetic material and is configured to be able to cover the resolver 4. The non-magnetic material that constitutes the shielding member 5 is not particularly limited, but may be, for example, an aluminum alloy.

[0035] The shielding member 5 includes a first shielding plate portion 51 disposed to extend radially of the shaft 2 in the space between the resolver rotor 41 and the gap C formed between the stator coil 3a and the rotor 3b, and a second shielding plate portion 52 extending from the first shielding plate portion 51 in a direction approaching the rotor 3b of the motor 3. The first shielding plate portion 51 has an annular shape. The right side surface of the first shielding plate portion 51 is disposed to face the gap C formed between the stator coil 3a and the rotor 3b. The radial outer edge of the first shielding plate portion 51 extends radially outward from the gap C, while the radial inner edge of the first shielding plate portion 51 extends radially inward from the gap C. Therefore, when viewed from the left side, the gap C is positioned in the radial middle of the first shielding plate portion 51. The thickness of the first shielding plate portion 51 is set thinner than the thickness of the main body portion 40a of the resolver stator 40.

[0036] The second shielding plate portion 52 extends from the radially inner edge of the first shielding plate portion 51 in a direction approaching the rotor 3b of the motor 3, and forms a continuous ring shape in the circumferential direction of the rotor 3b of the motor 3. The angle formed between the first shielding plate portion 51 and the second shielding plate portion 52 is set to approximately 90 degrees. Note that the angle formed between the first shielding plate portion 51 and the second shielding plate portion 52 is not limited to 90 degrees, and can be set, for example, in the range of 80 degrees to 120 degrees.

[0037] The second shielding plate portion 52 is disposed radially inward of the gap C formed between the stator coil 3a and the rotor 3b. This allows the second shielding plate portion 52 to prevent leakage magnetic flux emitted from the gap C toward the main body portion 40a of the resolver stator 40 from reaching the main body portion 40a.

[0038] The first shielding plate portion 51 and the second shielding plate portion 52 are integrally molded. The method for integrally molding the shielding member 5 is not particularly limited, but for example, the shielding member 5 having the first shielding plate portion 51 and the second shielding plate portion 52 can be obtained by press-molding a single plate material in a mold (not shown). The first shielding plate portion 51 and the second shielding plate portion 52 may be formed from separate members. In this case, the first shielding plate portion 51 and the second shielding plate portion 52 can be molded from separate members and then joined together to form an integral unit.

[0039] As shown in FIG. 9 , the first shielding plate portion 51 of the shielding member 5 is fastened to the case A together with the resolver stator 40 by a common fastening member 400. That is, the first shielding plate portion 51 is formed with a first insertion hole 51a penetrating in the thickness direction, through which a shank of a bolt or screw serving as the fastening member 400 is inserted. Furthermore, the main body portion 40a of the resolver stator 40 is formed with a second insertion hole 40A penetrating in the thickness direction so as to coincide with the first insertion hole 51a. The case A is formed with a screw hole A1 corresponding to the first insertion hole 51a and the second insertion hole 40A. The shank of the fastening member 400 is inserted sequentially through the first shielding plate portion 51, the first insertion hole 51a, and the second insertion hole 40A of the resolver stator 40, and then screwed into the screw hole A1 of the case A and fastened, thereby fastening the first shielding plate portion 51 and the resolver stator 40 together to the case A. 7 and 8, in this embodiment, the number of fastening members 400 is four, and the first shielding plate 51 is fastened to the case A at multiple portions spaced apart in the circumferential direction of the shaft 2 by the four fastening members 400. However, the number of fastening members 400 is not limited to four and may be any number less than three or greater than five. The number of first insertion holes 51a, second insertion holes 40A, and screw holes A1 may be the same as the number of fastening members 400. Note that the first shielding plate 51 and the resolver stator 40 may be fastened to the case A by separate fastening members (not shown) rather than being fastened together.

[0040] In this embodiment, as described above, the gap between the bearing portion 200 and the stator coil 3a and the rotor 3b is set narrow, making it difficult to arrange the first shielding plate portion 51 of the shielding member 5 between the bearing portion 200 and the stator coil 3a and the rotor 3b. To address this, a notch 51c is formed on the radially outer side of the first shielding plate portion 51 of the shielding member 5 to avoid interference with the bearing portion 200. Because the bearing portion 200 is provided below the shaft 2 and the bearing fixing portion 202 is close to the stator coil 3a and the rotor 3b, the notch 51c is formed only in the lower part of the first shielding plate portion 51 to avoid interference with the bearing fixing portion 202.

[0041] In this way, the cutout portions 51c are formed only in the first shielding plate portion 51, and not in the second shielding plate portion 52. In other words, the cutout portions 51c are formed in portions of the shielding member 5 other than the second shielding plate portion 52, so that the second shielding plate portion 52 can be formed into a ring shape that is continuous in the circumferential direction. This allows the second shielding plate portion 52 to enhance the shielding effect of leakage magnetic flux. Furthermore, the shape of the cutout portions 51c can be set arbitrarily, but in this embodiment, the cutout portions 51c are arc-shaped.

[0042] Furthermore, cutout portion 51c is formed in a portion circumferentially away from the portion fastened by fastening member 400 on shaft 2. In other words, cutout portion 51c is formed between the portions fastened by fastening member 400. Since cutout portion 51c is a portion for avoiding interference with bearing portion 200, it is preferable to cut out only the minimum range that can avoid interference with bearing portion 200, but this is not limitative and cutout may be made over an area that is sufficiently larger than bearing portion 200.

[0043] Although not shown, a gear may be provided inside the case A in a portion that interferes with the shielding member 5. In this case, a notch for avoiding interference with the gear may be formed in the shielding member 5. Also, the shielding member 5 may be formed with both the notch 51c for avoiding interference with the bearing portion 200 and a notch for avoiding interference with the gear.

[0044] 6 and 8, a notch 40c is also formed in the main body 40a of the resolver stator 40 so as to correspond to the notch 51c of the shielding member 5. Note that the notch 40c of the resolver stator 40 is not essential and may be provided as needed.

[0045] (Effects of the embodiment) As described above, according to this embodiment, the shielding member 5 is provided inside the case A, the first shielding plate portion 51 is arranged in the space between the resolver rotor 41 and the gap C formed between the stator coil 3a and rotor 3b of the motor 3, and the second shielding plate portion 52 is formed extending from the first shielding plate portion 51 in a direction approaching the side surface of the rotor 3b of the motor 3. Therefore, the first shielding plate portion 51 and the second shielding plate portion 52 can prevent leakage magnetic flux emitted from the gap C formed between the stator coil 3a and rotor 3b of the motor 3 from reaching the resolver 4. The first shielding plate portion 51 extends in the radial direction, while the second shielding plate portion 52 extends in a direction approaching the rotor 3b of the motor 3, and the extending directions of the two shielding plate portions 51, 52 are different, thereby improving the shielding effect of the leakage magnetic flux emitted from the gap C.

[0046] Furthermore, by forming the cutout portion 51c in the shielding member 5, interference between the shielding member 5 and the bearing portion 200 can be avoided. As a result, when narrowing the gap between the shielding member 5 and the bearing portion 200 disposed inside the case A in order to shorten the left-right dimension of the case A, the shielding member 5 can be disposed while avoiding interference with the bearing portion 200. Furthermore, because the cutout portion 51c is formed only in a part of the shielding member 5, the provision of the cutout portion 51c does not substantially reduce the shielding effect of the shielding member 5 against leakage magnetic flux.

[0047] The above-described embodiments are merely examples in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention. [Industrial Applicability]

[0048] As described above, the vehicle drive device according to the present invention can be used in, for example, hybrid vehicles and electric vehicles. [Explanation of symbols]

[0049] 1 Vehicle drive unit 2 shafts 3 motors 4 Resolver 40 resolver stator 41 Resolver rotor 5 Shielding material 51 1st shielding plate part 51c Notch 52 Second shielding plate part 100 1st gear 101 Lower shaft 102 2nd gear 200 Bearing section 201 Bearing 202 Bearing fixing part Case A C-Gap E Fastening member

Claims

1. A vehicle drive device including a shaft, a motor that rotates and drives the shaft, a resolver that detects a rotation state of the motor, and a shielding member that suppresses radiation of leakage magnetic flux from the motor to the resolver, a case that houses the shaft, the motor, and the resolver; the shielding member is disposed so as to extend in a radial direction of the shaft in a space between a gap formed between a stator coil and a rotor of the motor and the resolver, The vehicle drive device, wherein a notch is formed on the radially outer side of the shielding member to avoid interference with a bearing or gear provided inside the case.

2. 2. The vehicle drive system according to claim 1, the bearing portion has a bearing and a bearing fixing portion for fixing the bearing in a predetermined position, the bearing fixing portion is formed to approach the motor in the axial direction, The vehicle drive device, wherein the cutout portion is formed to avoid interference with the bearing fixing portion.

3. 3. The vehicle drive system according to claim 2, a first gear is provided on the shaft; a lower shaft having a second gear that meshes with the first gear is provided below the shaft; the bearing portion supports one axial end portion of the lower shaft, The vehicle drive device, wherein the cutout portion is formed only in a lower portion of the shielding member.

4. 2. The vehicle drive system according to claim 1, the shielding member has a first shielding plate portion disposed so as to extend in a radial direction of the shaft in a space between a gap formed between a stator coil and a rotor of the motor and the resolver, and a second shielding plate portion extending from an inner edge portion of the first shielding plate portion in the radial direction of the shaft in a direction approaching the rotor of the motor, The vehicle drive device, wherein the cutout portion is formed in the first shielding plate portion.

5. 5. The vehicle drive system according to claim 4, the second shielding plate portion has a continuous annular shape in a circumferential direction of the rotor of the motor, The vehicle drive device, wherein the cutout portion is formed in a portion of the shielding member other than the second shielding plate portion.

6. 5. The vehicle drive system according to claim 4, the first shielding plate portion is fastened to the case at a plurality of portions spaced apart in a circumferential direction of the shaft by a plurality of fastening members; The vehicle drive device, wherein the notch is formed in a portion of the shaft that is spaced apart in a circumferential direction from a portion fastened by the fastening member.

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