Vehicle drive device

Abstract

A vehicle drive device (1) comprising: a rotary shaft (17) arranged on an outer periphery of a pump connecting shaft member (16) designed to be driven by a prime mover (2), a motor (22) arranged on an outer circumference of the rotary shaft (17), a drive housing (3) having an end wall (6) extending along an end face of the motor (22), the pump connecting shaft element (16) passing through a central portion of the end wall (6), a rotation detection sensor (37) having a sensor rotor (38) configured to rotate integrally with a motor rotor (23) of the motor (22), and a sensor stator (39) attached to an inner surface of the end wall (6) with a stator fastener (43) penetrating the end wall (6) through a through hole (42) to detect rotation of the sensor rotor (38), and an oil pump (54) with: a pump rotor (57) arranged in a pump chamber (56) formed on an outer surface of the end wall (6) and configured to be driven by the pump connecting shaft member (16), an oil pump cover (60) connected to a connecting surface (68) formed on the outer surface of the end wall (6) by a cover fastener (74) being fastened to a cover screw hole (70) arranged in the connecting surface (68) to make the pump chamber (56) a space closed to the outside of the vehicle drive device (1), and a sealing member (72) formed in a ring shape so as to surround an outer periphery of the pump chamber (56) and arranged between the connecting surface (68) and the oil pump cover (60), wherein the cover screw hole (70) is formed in a shape that is open only to the outside of the drive housing (3) and is arranged on the connecting surface (68) radially outside of the sealing member (72), and wherein the through hole (42) through which the stator fastener (43) is inserted from the outside of the drive housing (3) is arranged on the connecting surface (68) radially inside of the sealing member (72).

Description

TECHNICAL FIELDThe present invention relates to a vehicle drive device, and more particularly to a vehicle drive device in which the arrangement of built-in mechanisms is optimized and improvements in assembly processing and reduction in size of the device are achieved.BACKGROUNDA hybrid vehicle is equipped with a vehicle driving device including an engine and a motor serving as an electric motor and a generator. In the vehicle drive device, a motor of a driving force transmission mechanism including a motor rotor and a motor stator is accommodated in a drive case. The vehicle drive device includes a rotation detection sensor for detecting the rotation of the motor rotor and an oil pump for supplying oil to each part of the device.As a conventional vehicle drive device, JP 2013-18 373 A discloses a structure in which a rotation detection sensor is disposed between an oil pump and a motor rotor of a motor generator, a boss is provided from a position different from a housing of the oil pump to fix a sensor stator of the rotation detection sensor to a housing, and the sensor stator is attached to the boss via a fastener such as a bolt.Further, as a conventional vehicle drive device, JP 2007-153 114 A discloses a structure in which a rotation detection sensor is disposed on the outside of an oil pump, a sensor stator of the rotation detection sensor is attached to a cover member via a fastener such as a bolt, and is placed on the side of a motor generator, so that compactness of the entire drive device is achieved.However, in the structure of JP 2013-18 373 A, the sensor stator of the rotation detection sensor extends to a position overlapping with the motor rotor and the motor stator in an axial direction of the rotation shaft. Therefore, there is a possibility that a magnetic field occurring between the motor rotor and the motor stator or a magnetic field leaking into a space in the drive case from the motor stator is transmitted to the rotation detection sensor, thereby reducing the accuracy of the rotation position detection of the rotation detection sensor. As a result, there is a possibility that the reduction in reliability of the rotation detection sensor is caused.In addition, in the structure of JP 2013-18 373 A, the rotation detection sensor is attached to the rotation shaft, so that there is a need to provide a space occupied by the rotation detection sensor. As a result, there is a problem that the size of the driving device increases in the axial direction of the rotating shaft.In addition, in the structure of JP 2007-153 114 A, the rotation detection sensor extends to a position overlapping with the motor rotor and the motor stator in an axial direction of the rotation shaft. Therefore, in the structure of JP 2007-153 114 A, there is a possibility that a magnetic field occurring between the motor rotor and the motor stator or a magnetic field entering a space inside a housing from the motor stator is transmitted to the rotation detection sensor, and thereby the accuracy of the rotation position detection of the rotation detection sensor is lowered. As a result, there is a possibility that the reduction in reliability of the rotation detection sensor is caused.In addition, in the structure of JP 2007-153 114 A, there is a problem in that the size of the rotation detection sensor increases. In addition, in the structure of Patent Document 2, there is a need to set the rotational position of the rotation detection sensor, provide a dedicated position adjustment hole in the drive housing, and a dedicated plug for closing the position adjustment hole. As a result, there is a possibility of a decrease in the machining efficiency.In addition, in the structures of JP 2013-18 373 A and JP 2007-153 114 A, the rotation detection sensor is fixed in the drive housing by a fastener. In a structure in which the rotation detection sensor is fixed by a fastener from the outside of the drive housing, there is a need to attach a seal for preventing oil leakage from a through hole through which the fastener is inserted. As a result, there is a problem that additional assembly work is necessary.US 2013 / 0 283 972 A1 discloses a vehicle drive device having a drive housing in which an electric motor and a transmission are accommodated. Between an axial outer end cover of the drive housing and an inner pump cover which are connected to each other, a pump chamber of an oil pump driven by the shaft of the electric motor is formed. The fastening of the outer end cover of the drive housing to a further housing part is effected by means of fastening elements such as bolts.US 2012 / 0 080 286 A1 describes a further vehicle drive device, which is similar in the basic structure of US 2013 / 0 283 972 A1, having a drive housing in which an electric motor and a transmission are accommodated. In this driving device, a rotation detecting sensor is provided in the driving case, which has a sensor stator and a sensor rotor. The sensor stator is fastened from the inside of the drive housing by a screw bolt to a pump body radially outside a bearing shoulder.SUMMARYIt is an object of the present invention to provide a vehicle drive device having a drive housing for accommodating a drive force transmission mechanism, in which oil leakage can be prevented while achieving improvements in assemblability and reduction in size of the drive device.According to the present invention, there is provided a vehicle driving apparatus having the features of claim 1.In this configuration, the through hole through which the stator fastener for fixing the sensor stator to the end wall is inserted is disposed at the joint surface inside the sealing member. Thereby, the sealing between the stator fastener and the through hole and the sealing for the oil pump can be achieved by a single sealing member without providing a plurality of sealing members in the oil pump as in a conventional structure. As a result, a single seal member can prevent the leakage of the oil from the oil pump and the portion between the stator fastener and the through hole.In this way, a worker can reduce a work of assembling the oil pump, so that the processing is improved.Moreover, according to the above configuration, the through hole through which the stator fastener is inserted is disposed at the joint surface inside the seal member of the oil pump. Therefore, there is no need to particularly increase a diameter dimension of the rotation detection sensor. As a result, the dimension in the radial direction of the rotation detection sensor can be reduced.In this way, the rotation detection sensor can be easily accommodated in the space surrounded by the rotation shaft and the motor disposed on an outer periphery of the rotation shaft, and the rotation detection sensor and the motor can be disposed in an overlapping manner in an axial direction of the rotation shaft. As a result, the size of the device can be reduced.BRIEF DESCRIPTION OF THE DRAWINGSThe accompanying drawings show: FIG. 1 is a perspective view of a vehicle driving device according to an embodiment of the present invention, FIG. 2 is a side view of the vehicle driving device according to an embodiment of the present invention, from which an oil pump cover is removed, FIG. 3 is a sectional view of the vehicle driving device according to an embodiment of the present invention taken along a line X-X in FIG. 2 , FIG. 4 is a sectional view of the vehicle driving device according to an embodiment of the present invention taken along a line Y-Y in FIG. 3 , FIG. 5 is an inner view of an end wall viewed from the inside of a drive case according to an embodiment of the present invention, FIG. 6 is a sectional view of the vehicle driving device according to an embodiment of the present invention taken along a line Z-Z in FIG. 5 ; and FIG. 7 is a disassembled view showing a mounting state of the vehicle driving device according to an embodiment of the present invention.DETAILED DESCRIPTION OF THE EMBODIMENTSHereinafter, an illustrative embodiment of the present invention will be described with reference to the drawings.Figs. 1 to 7 show an illustrative embodiment of the present invention. As shown in FIGS. 1 to 3, a vehicle drive apparatus 1 includes a drive housing 3 connected to a prime mover 2. The drive housing 3 is composed of a first housing part 4 and a second housing part 5 and has an end wall 6.The first case 4 is formed in a substantially cylindrical shape, and one side in an axial direction thereof is fastened to the engine 2 by a fastening bolt 7 that is a fastener. The first housing member 4 has a first housing wall portion 8 and an auxiliary wall portion 9 therein. The auxiliary wall portion 9 is fixed to the other side of the first case 4 by a fastening bolt 10 which is a fastener. The second housing part 5 is formed in a substantially cylindrical shape, and one side in an axial direction thereof is fastened to the other side in the axial direction of the first housing part 4 by a fastening bolt 11 that is a fastener. The second case 5 has a second case wall portion 12 inside one side in the axial direction thereof. The end wall 6 is formed in a substantially disk shape extending along an end surface of a first motor generator 22 (to be described later). The end wall 6 is fixed to the other side in the axial direction of the second case 5 by a fixing bolt 13 which is a fastener.The vehicle drive device 1 includes a drive engine connecting shaft member 14 driven by the drive engine 2. The engine connecting shaft member 14 is rotatably supported on the first housing wall portion 8 and the auxiliary wall portion 9 of the first housing part 4 via a bearing. One side in the axial direction of the engine connecting shaft member 14 is connected to a crankshaft of the engine 2 via a clutch 15. One side in the axial direction of a pump connecting shaft member 16 is connected to the other side of the engine connecting shaft member 14. The pump connection shaft member 16 is disposed in such a manner that the other side in the axial direction thereof penetrates a central portion of the end wall 6. The pump connection shaft member 16 is driven by the engine 2 via the engine connection shaft member 14.The vehicle drive device 1 includes a first rotation shaft 17 disposed on an outer periphery of the pump connection shaft member 16. The first rotating shaft 17 has a first cylindrical body portion 18, a first disk-shaped connecting portion 19 and a first cylindrical rotor supporting portion 20, an inner periphery of the first body portion 18 is rotatably supported on the pump connecting shaft member 16 via a bearing, and an outer periphery thereof is rotatably supported on the second housing wall portion 12 of the second housing 5 and the end wall 6 via a bearing. The first connecting portion 19 extends outward in a radial direction from an outer circumferential surface of the first body portion 18. The first rotor support portion 20 extends in an axial direction of the first body portion 18 from an outer circumferential edge of the first connection portion 19. the first body portion 18, the first connection portion 19, and the first rotor support portion 20 are formed in an H-shaped cross section. A first space 21 surrounded by the first body portion 18, the first connecting portion 19, and the first rotor support portion 20 is provided on the end wall 6 side.The vehicle drive device 1 includes a first motor generator 22 that is disposed on an outer periphery of the first rotation shaft 17 and serves as an electric motor and a generator. The first motor generator 22 includes a first motor rotor 23 and a first motor stator 24. an inner circumferential surface of the first motor rotor 23 is supported on an outer circumferential surface of the first rotor support portion 20. An inner circumferential surface of the first motor stator 24 thereof is disposed adjacent to the outer circumferential surface of the first motor rotor 23, and an outer circumferential surface is supported on an inner circumferential surface of the second case 5. The end wall 6 of the engine case 3 extends outward in a radial direction along an end surface of the first motor generator 22 opposite to the engine 2.In addition, the vehicle drive device 1 includes a second rotation shaft 25 disposed on an outer periphery of the engine connecting shaft member 14. The second rotating shaft 25 has a second cylindrical body portion 26, a second disk-shaped connecting portion 27, and a second cylindrical rotor supporting portion 28. an inner periphery of the second body portion 26 is rotatably supported on the engine connecting shaft member 14 via a bearing, and an outer periphery thereof is rotatably supported on the first housing wall portion 8 of the first housing member 4 and the auxiliary wall portion 9 via a bearing. The second connecting portion 27 extends outward in a radial direction from an outer circumferential surface of the second body portion 26. The second rotor support portion 28 extends in an axial direction of the engine connecting shaft member 14 from an outer circumferential edge of the second connecting portion 27. the second body portion 26, the second connecting portion 27, and the second rotor support portion 28 are formed in an H-shaped cross section. A second space 29 surrounded by the first body portion 26, the second connection portion 27, and the second rotor support portion 28 is provided on the auxiliary wall portion 9 side.The vehicle drive device 1 includes a second motor generator 30 that is disposed on an outer periphery of the second rotation shaft 25 and serves as an electric motor and a generator. The second motor generator 30 includes a second motor rotor 31 and a second motor stator 32. an inner circumferential surface of the second motor rotor 31 is supported on an outer circumferential surface of the second rotor support portion 28. An inner circumferential surface of the second motor stator 32 is disposed adjacent to the outer circumferential surface of the second motor rotor 31, and an outer circumferential surface thereof is supported on an inner circumferential surface of the first case 4.In the vehicle drive device 1, first to third planetary gear mechanisms 33 to 35 are disposed between the auxiliary wall portion 9 of the first case 4 and the second case wall portion 12 of the second case 5, and on an outer periphery of the engine connecting shaft member 14.A driving force of the first motor generator 22 is transmitted in the order of the first planetary gear mechanism 33, the second planetary gear mechanism 34, the engine connecting shaft member 14, and the third planetary gear mechanism 35, and then transmitted to an output gear 36. A driving force of the second motor generator 30 is transmitted in the order of the third planetary gear mechanism 35 and the engine connecting shaft member 14, and is then transmitted to the output gear 36. A driving force of the engine 2 is transmitted in the order of the engine connecting shaft member 14 and the third planetary gear mechanism 35 and then transmitted to the output gear 36. The driving force transmitted to the output gear 36 is transmitted to a drive axle through a differential through a final reduction gear train, thereby driving wheels.The first motor generator 22 is driven by the driving force of the engine 2 via the first planetary gear mechanism 33 and the second planetary gear mechanism 34, and serves as a generator. The second motor generator 30 serves as an electric motor by the power generated by the first motor generator 22. The driving force generated by the second motor generator 30 is transmitted to the output gear 36 through the third planetary gear mechanism 35, and assists the driving force of the engine 2.The vehicle drive device 1 includes a first rotation detection sensor 37 for detecting the rotation position of the first motor rotor 23 relative to the first motor stator 24 of the first motor generator 22, and as shown in FIGS. 4 to 6, the first rotation detection sensor 37 includes a first sensor rotor 38 and a first sensor stator 39. the first sensor rotor 38 rotates integrally with the first motor rotor 23. in the first rotation shaft 17, a first fixing portion 40 is formed on an outer circumferential surface of the first body portion 18 facing the first space 21 surrounded by the first body portion 18, the first connecting portion 19, and the first rotor supporting portion 20 for supporting the first motor rotor 23. The first sensor rotor 38 is attached to the first attachment portion 40 of the first body portion 18 so as to face outward in the radial direction.The first sensor stator 39 is attached to an inner surface of the end wall 6. A pump housing 55 (to be described later) is formed in an inner surface of the end wall 6 facing the first connection portion 19 of the first rotation shaft 17. The pump housing 55 bulges into the first space 21. A first recess 41 is formed in an end surface of the pump casing 55 on the side of the first motor rotor 23. The first recess 41 has a concave shape and accommodates the first sensor stator 39. A first through hole 42 is formed on the pump housing 55 formed in the end wall 6. The first through hole 42 is opened to the first recess 41 from the outer surface. An outer periphery of a front end portion of the first sensor rotor 38 is surrounded and accommodated by the first recess 41 formed in the pump housing 55 to detect the rotation of the first sensor rotor 38 integrally rotating with the first motor rotor 23, and a first stator fastener 43, for example, a fastening bolt inserted through the first through hole 42, is fastened to a first fastening tool 44, for example, a fastening nut in contact with the first sensor rotor 38, so that the first sensor stator 39 is attached to the end wall 6.Thereby, in the first rotation detection sensor 37, the first sensor rotor 38 and the first sensor stator 39 are disposed within the first space 21 surrounded by the first recess 41 of the pump housing 55, and the first connection portion 19 and the first rotor support portion 20 of the first rotation shaft 17.The vehicle drive device 1 includes a second rotation detection sensor 45 for detecting the rotation position of the second motor rotor 31 relative to the second motor stator 32 of the second motor generator 30, the second rotation detection sensor 45 includes a second sensor rotor 46 and a second sensor stator 47. the second sensor rotor 46 rotates integrally with the second motor rotor 31.A sensor rotor 46 forms a second fixing portion 48 on an outer peripheral surface of the second body portion 26 facing the second space 29 surrounded by the second body portion 26, the second connecting portion 27, and the second rotor supporting portion 28. The second sensor rotor 46 is attached to the second attachment portion 48 of the second body portion 26 so as to face outward in the radial direction.The second sensor stator 47 is attached to an inner surface of the auxiliary wall portion 9 on the side of the second motor rotor 31. A bulge portion 49 is formed in an inner surface of the auxiliary wall portion 9 facing the second connection portion 27 of the second rotation shaft 25. The bulge portion 49 bulges into the second space 29. A second recess 50 is formed in an end surface of the bulge portion 49 on the side of the second motor rotor 31. The second recess 50 has a concave shape and receives the second sensor stator 47. A second through hole 51 is formed at the bulge portion 49 formed in the auxiliary wall portion 9. The second through hole 51 is opened to the second recess 50 from the end surface on the third planetary gear mechanism 35 side. An outer periphery of a front end portion of the second sensor rotor 46 is surrounded and accommodated by the second recess 50 formed in the bulge portion 49 to detect the rotation of the second sensor rotor 46 integrally rotating with the second motor rotor 31, and a second stator fastener 52, for example, a fastening bolt inserted through the second through hole 51 is fastened to a second fastening tool 53, for example, a fastening nut in contact with the second sensor stator 47, such that the second sensor stator 47 is attached to the auxiliary wall portion 9.Thereby, in the second rotation detection sensor 45, the second sensor rotor 46 and the second sensor stator 47 are disposed within the second space 29 surrounded by the second recess 50 of the bulge portion 49, and the second connection portion 27 and the second rotor support portion 28 of the second rotation shaft 25.The vehicle drive device 1 includes an oil pump 54 on the end wall 6. As illustrated in FIGS. 6 and 7, the oil pump 54 forms the pump housing 55 integrally with the end wall 6. As a result, in the first motor generator 22, the first motor stator 24 is disposed on an outer peripheral side of the pump casing 55, and the first rotor supporting portion 20 of the first rotary shaft 17 for supporting the first motor rotor 23 is disposed so as to overlap the pump casing 55 in the radial direction of the first rotor shaft 17. The first recess 41 having a concave shape is formed on an end surface of the pump housing 55 on the first motor rotor 23 side.A pump chamber 56 is concaved at a central portion of the pump housing 55 and at an outer surface of the end wall 6. A pump rotor 57 is disposed in the pump chamber 56 and is driven by the pump connection shaft member 16. The pump rotor 57 is constructed of an inner rotor 58 and an outer rotor 59. The inner rotor 58 is rotated by the other end in an axial direction of the pump connection shaft member 16 passing through the pump housing 55. The outer rotor 59 eccentrically rotates in engagement with the outer side of the inner rotor 58.The oil pump 54 includes an oil pump cover 60 for making the pump chamber 56 in which the pump rotor 57 is disposed into a closed space. The oil pump cover 60 has a cylindrical passage forming portion 61 formed in a substantially disk shape and extending downward and outward in the radial direction from the central portion. The passage forming portion 61 has a passage fixing portion 62 at a lower extension end.The oil pump cover 60 includes a suction hole 63 communicating with the suction side of the pump chamber 56 and a discharge hole 64 communicating with the discharge side of the pump chamber 56. The suction hole 63 communicates with a suction passage 65 provided in the passage forming portion 61. The suction passage 65 is opened to a lower end of the passage forming portion 61 and communicates with an oil return passage 66 opened to a lower portion of the outer surface of the end wall 6. The oil return passage 66 supplies the oil to the suction passage 65 after lubricating the first planetary gear mechanism 33 or the like in the drive housing 3 and returns the oil to the oil pump 54. The discharge hole 64 communicates with an oil supply passage 67 that opens to the vicinity of the pump chamber 56 on the outer surface of the end wall 6.The oil discharged by the oil pump 54 is supplied to the first motor generator 22 and the second motor generator through the oil supply passage 67, thus preventing the first motor generator 22 and the second motor generator from being excessively heated. In addition, the oil discharged from the oil pump 54 is supplied to the first planetary gear mechanism 33 or the like in the drive housing 3 through the oil supply passage 67, and thus lubricates each part.The oil pump cover 60 is connected to a cover connecting surface 68 formed on the outer surface of the end wall 6. The cover connection surface 68 has the openings of the oil supply passage 67 and the first through hole 42 on the outer surface of the end wall 6. The oil pump cover 60 has a plurality of cover through holes 69, and the cover through holes 69 are disposed on an outer circumferential side of the openings of the oil supply passage 67 and the first through hole 42. The end wall 6 is provided at the cover joint surface 68 with a plurality of cover screw holes 70 that fit the cover through holes 69 of the oil pump cover 60. Each of the cover screw holes 70 has a shape that opens only to the outside of the end wall 6. The cover screw holes 70 are disposed on the outer circumferential side of the openings of the oil supply passage 67 and the first through hole 42.In addition, the end wall 6 is provided at the cover joint surface 68 with an annular seal groove 71 surrounding the pump chamber 56.The seal groove 71 is disposed in an inner circumferential side of the cover screw hole 70 and in an outer circumferential side of the openings of the oil supply passage 67 and the first through hole 42. An annular seal member 72 is installed in the seal groove. In the cover connecting surface 68 on the inner peripheral side of the seal member 72, a position adjustment hole 73 for adjusting the position of the first sensor stator 39 is formed. The position adjustment hole 73 is formed to pass through from the outer surface to the inner surface of the end wall 6.The oil pump cover 60 is disposed on the cover joint surface 68, and a cover fastener 74, for example, a fastening bolt inserted through the cover through hole 69, is fastened to the cover screw hole 70 so that the oil pump cover 60 is joined to the cover joint surface 68. The pump chamber 56 and the openings of the oil supply passage 67 and the first through hole 42 are closed by the seal member 72 disposed between the oil pump cover 60 and the cover connection surface 68.The passage forming portion 61 of the oil pump cover 60 has a passage fixing portion 68 at a lower end where the suction passage 65 is opened. As shown in FIG. 7, the passage fixing portion 62 has a fixing portion through hole 75. the passage fixing portion 62 is disposed on both sides above the opening of the suction hole 65 and connected to a passage portion connecting surface 76 formed in a lower portion of the outer surface of the end wall 6. The passage portion connection surface 76 is formed in a shape where a small-diameter ring shape is respectively disposed on both sides of a ring shape surrounding the opening of the oil return passage 66 provided in a lower portion of the outer surface of the end wall 6. The end wall 6 has position portion screw holes 77 that match the attachment portion through holes 75 of the passage attachment portion 62 at the passage portion connection surface 76. Each of the passage section screw holes 77 has a shape opened only to the outside of the end wall 6, and is disposed on both sides above the opening of the oil return passage 66. The passage portion connecting surface 76 of the end wall 6 has an annular seal groove 78 surrounding the opening of the oil return passage 66 as shown in FIG. 2. The seal groove 78 is disposed on an inner circumferential side of the passage portion screw hole 77 and on an outer circumferential side of the opening of the oil return passage 66. An annular seal member 79 is fixed to the seal groove 78.The passage fixing portion 62 is disposed on the passage portion connection surface 76, and a passage portion fastener 80, for example, a fixing bolt inserted through the fixing portion passage hole 75, is fixed to the passage portion screw hole 77 so that the passage forming portion 61 is connected to the passage portion connection surface 76. In the passage forming portion 61, the opening of the oil return passage 66 is closed by a seal member 79 disposed between the passage fixing portion 62 and the passage portion connection surface 76.In this vehicle drive device 1, a cover connecting surface 68 is formed on an outer surface of the end wall 6. The oil pump cover 60 is connected to the cover connecting surface 68. The cover connecting surface 68 has the openings of the oil supply passage 67 and the first through hole 42 and is formed in a ring shape surrounding the outer periphery of the pump chamber 56. In the cover connecting surface 68 of the end wall 6, a plurality of cover screw holes 70 that fit the cover through holes 69 of the oil pump cover 60 are provided. Each of the cover screw holes 70 has a shape opened only to the outside of the end wall 6, and is disposed outside the seal member 72. In addition, in the vehicle drive device 1, the first through hole 42 through which the first stator fastener 43 of the first sensor stator 39 is inserted is disposed at the cover connection surface 68 inside the sealing member 72.Thus, the vehicle drive device 1 has a structure in which the first through hole 42 through which the first stator fastener 43 for fastening the first sensor stator 39 to the end wall 6 is inserted is disposed on the inner side of the sealing member 72 of the cover joint surface 68. Therefore, the sealing between the first stator fastener 43 and the first through hole 42 and the sealing for the oil pump 54 can be achieved by a single sealing member 72 without providing a plurality of sealing members in the oil pump as in the conventional structure. As a result, a single seal member 72 can prevent the leakage of the oil from the oil pump 54 and the portion between the first stator fastener 43 and the first through hole 42.In this way, a worker can reduce assembly work of the oil pump 54 and thereby improve workability.In addition, in this vehicle drive device 1, the first through hole 42 through which the first stator fastener 43 is inserted is disposed on the inside of the seal member 72 of the oil pump 54. Accordingly, there is no need to particularly increase a diameter dimension of the first rotation detection sensor 37. As a result, the dimension in the radial direction of the first rotation detection sensor 37 can be reduced.Thereby, in the vehicle drive device 1, the first rotation detection sensor 37 can be easily accommodated in the first space 21 surrounded by the first rotation shaft 17 and the first motor generator 22 disposed on an outer periphery of the first rotation shaft 17, and the first rotation detection sensor 37 and the first motor generator 22 can be disposed in an overlapping manner in the axial direction of the first rotation shaft 17. As a result, the size of the device can be reduced.In the vehicle drive device 1, the first recess 41 having a concave shape is formed in an end surface on the first motor rotor 23 side of the pump housing 55 for forming the pump chamber 56, and the first through hole 42 is formed to open to the first recess 41 from the outer surface of the end wall 6. In the vehicle drive device 1, the first sensor stator 39 of the first rotation detection sensor 37 is received and attached to the first recess 41 by the first stator fastener 43 inserted through the first through hole 42.Thus, the vehicle drive device 1 has a structure in which the first sensor stator 39 of the first rotation detection sensor 37 is accommodated in the first recess 41 formed in the pump housing 55 of the oil pump 54. Thereby, the pump housing 55 and the first sensor stator 39 can be arranged in an overlapping manner in a radial direction of the first rotation shaft 17. In addition, in the vehicle drive device 1, the first recess 41 in which the first sensor stator 39 is accommodated is formed in the pump housing 55, so that the size of the first rotation detection sensor 37 can be reduced.With these configurations, the size of the vehicle drive device 1 in the axial direction of the first rotation shaft 17 and the radial direction of the first rotation shaft 17 can be reduced.In addition, in the vehicle drive device 1, the first through hole 42 through which the first stator fastener 43 is inserted is opened to the first recess 41 of the pump housing 55. Accordingly, there is no need to form a fixing portion for selectively inserting the first stator fastener 43 independently of the pump casing 55. In addition, the first sensor stator 39 may be supported by the pump housing 55 with relatively high rigidity.Therefore, in the vehicle drive device 1, the first sensor stator 39 is supported by the pump housing 55 with a relatively large volume, so that the contact area of the first sensor stator 39 held in the end wall 6 of the drive housing 3 can be increased. As a result, the first sensor stator 39 can be stably arranged in the end wall 6 of the drive housing 3.Thereby, in the vehicle drive device 1, the pump housing 55 can prevent the first sensor stator 39 from being displaced even when the vibration of the pump rotor 57 provided in the oil pump 54 is transmitted to the first stator fastener 43. In addition, the rotational position detection of the first sensor rotor 38 by the first sensor stator 39 can be stably performed, so that the reliability of the first rotation detection sensor 37 can be improved.In addition, in the vehicle drive device 1, the first sensor stator 39 is accommodated in the first recess 41 of the pump housing 55. Therefore, an outer circumferential edge of the first sensor stator 39 may be disposed on the pump rotor 57 side rather than an outer circumferential surface of the pump housing 55 in the radial direction of the first rotation shaft 17.As a result, in the vehicle drive device 1, a magnetic field occurring between the first motor stator 24 and the first motor rotor 23 is unlikely to reach the first rotation detection sensor 37. Thereby, the reliability of the first rotation detection sensor 37 due to the magnetic field by the first motor generator 22 can be prevented from being adversely affected.In addition, the vehicle drive device 1 has a structure in which the first through hole 42 through which the first stator fastener 43 is inserted is opened to the first recess 41 formed in the pump housing 55. Thereby, the oil leakage can be prevented by a single seal member 72 for performing the seal between the first stator fastener 43 and the first through hole 42 and the seal for the pump rotor 57. As a result, it is not necessary for a worker to provide a plurality of sealing members dedicated to the stator fastener as in the conventional structure in order to prevent the oil leakage to the outside of the end wall 6 of the drive housing 3 from the portion between the first stator fastener 43 and the first through hole 42.Thereby, in the vehicle driving device 1, the load in the assembly work can be reduced and the workability can be improved.In the vehicle drive device 1, the first motor stator 24 of the first motor generator 22 is disposed on an outer circumferential side of the pump casing 55, and the first rotor support portion 20 of the first rotation shaft 17 for supporting the first motor rotor 23 is disposed so as to overlap the pump casing 55 in the radial direction of the first rotation shaft 17. In the vehicle drive device 1, the first rotation detection sensor 37 is disposed in the first space 21 surrounded by the first recess 41 of the pump housing 55, and the first connection portion 19 and the first rotor support portion 20 of the first rotation shaft 17.Thereby, in the vehicle drive device 1, the first rotor support portion 20 can prevent the magnetic field from being transmitted to the first rotation detection sensor 37 even when the magnetic field occurring between the first motor stator 24 and the first motor rotor 23 passes through the first motor rotor 23 and flows to the first rotation shaft 17 side.In addition, in the vehicle drive device 1, the pump housing 55, the first connection portion 19, and the first rotor support portion 20 prevent the magnetic field from directly flowing to the first space 21 in which the first rotation detection sensor 37 is disposed even when the magnetic field occurring between the first motor stator 24 and the first motor rotor 23 flows into a space in the drive housing 3. Thereby, the first rotation detection sensor 37 can be prevented from being influenced by the magnetic field from the first motor generator 22. As a result, the rotation position detection precision of the first rotation detection sensor 37 is increased, and the reliability of the first rotation detection sensor 37 can thus be improved.In addition, as described above, the vehicle drive device 1 has a structure in which the first motor stator 24 is disposed on an outer circumferential side of the pump housing 55, the first rotor support portion 20 is disposed so as to overlap the pump housing 55 in the radial direction of the first rotation shaft 17, and the first rotation detection sensor 37 is disposed in the first space 21. Therefore, the axial dimension of the pump connection shaft member 16 and the radial dimension of the first rotation shaft 17 can be shortened, thereby reducing the size of the device.In the vehicle drive device 1, the position adjustment hole 73 for adjusting the position of the first sensor stator 39 is formed on the inner peripheral side of the seal member 72 of the cover connecting surface 68 of the end wall 6 to which the oil pump cover 60 is connected.Thereby, the vehicle drive device 1 has a structure in which the position adjustment hole 73 is formed on an inner circumferential side of the seal member 72 of the joint surface of the end wall 6. Thereby, the position adjustment hole 73 is sealed by the sealing member 72, and therefore, there is no need to provide a special plug for closing the position adjustment hole 73 of the first sensor stator 39. As a result, the sealing effect can be achieved only by covering the position adjustment hole 73 with the oil pump cover 60.Therefore, in the vehicle driving device 1, the amount of assembly work for a worker can be reduced.The present invention can prevent the oil leakage while achieving the improvement in assembly workability and the reduction in size of a vehicle drive device having a drive housing for accommodating a drive force transmission mechanism. The present invention can be applied to a hybrid vehicle or the like including an engine and a motor.

Claims

A vehicle drive device (1) comprising: a rotary shaft (17) disposed on an outer periphery of a pump connection shaft member (16) configured to be driven by a prime mover (2); a motor (22) disposed on an outer periphery of the rotary shaft (17); a drive housing (3) having an end wall (6) extending along an end surface of the motor (22), the pump connection shaft member (16) penetrating a central portion of the end wall (6); a rotation detection sensor (37) having a sensor rotor (38) configured to integrally rotate with a motor rotor (23) of the motor (22); and a sensor stator (39) fixed to an inner surface of the end wall (6) with a stator fastener (43) penetrating the end wall (6) through a through hole (42), A sensor rotor (38) to detect rotation, and an oil pump (54) comprising: a pump rotor (57) disposed in a pump chamber (56) formed on an outer surface of the end wall (6) and configured to be driven by the pump connection shaft member (16); an oil pump cover (60) connected to a connection surface (68) formed on the outer surface of the end wall (6) by fastening a cover fastener (74) to a cover screw hole (70) disposed in the connection surface (68) to make the pump chamber (56) a space closed to the outside of the vehicle drive device (1); and a seal member (72) formed in a ring shape so as to surround an outer periphery of the pump chamber (56), and which is disposed between the joint surface (68) and the oil pump cover (60), wherein the cover screw hole (70) is formed in a shape that is open only to the outside of the drive housing (3) and is disposed on the joint surface (68) radially outside of the seal member (72), and wherein the through hole (42) through which the stator fastener (43) is inserted from the outside of the drive housing (3) is disposed on the joint surface (68) radially inside of the seal member (72).The vehicle drive device (1) according to claim 1, wherein a recess (41) having a concave shape is formed on an end surface of a pump housing (55) forming the pump chamber (56) on the motor rotor (23) side, the through hole (42) being opened to the recess (41), and the rotation detection sensor (37) is accommodated in the recess (41) and mounted by the stator fastener (43) inserted through the through hole (42).The vehicle drive device (1) according to claim 2, wherein a motor stator (24) of the motor (22) is disposed on an outer circumferential side of the pump housing (55), a rotor support portion (20) of the rotation shaft (17) for supporting the motor rotor (23) is disposed so as to overlap the pump housing (55) in a radial direction of the rotation shaft (17), and the rotation detection sensor (37) is disposed in a space surrounded by the recess (41) in the pump housing (55), a connection portion (19) of the rotation shaft (17) facing the pump housing (55), and the rotor support portion (20).The vehicle drive device (1) according to claim 1, wherein a position adjustment hole (73) for adjusting a position of the sensor stator (39) is formed on the joint surface (68) to which the oil pump cover (60) is joined, on an inner peripheral side of the seal member (72).

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