JP4701587B2 - Electric drive - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric drive device mounted on a vehicle.
[0002]
[Prior art]
An electric drive device mounted on a hybrid vehicle or a 4WD vehicle is known. Such an electric drive device generally includes an electric motor and a speed reducer that transmits rotation of the electric motor to a drive shaft of a wheel. Since the speed reducer is constructed using planetary gears, bearings, etc., its lubrication is required. Therefore, it is known to use the rotation of the rotating member in the electric drive device or to provide an oil pump or the like to circulate the lubricating oil stored in the electric drive device to lubricate the necessary parts. Yes.
[0003]
For example, in a so-called in-wheel type electric drive device, an oil passage is formed in a hollow rotor shaft, and an oil reservoir for storing lubricating oil is formed at an end of the rotor shaft (Patent Document 1). And 2). In the electric drive device of Patent Document 1, the case structure in the vicinity of the bearing is formed in such a shape that the lubricating oil does not escape from the bearing that constitutes a part of the oil reservoir. Moreover, in the electric drive device of Patent Document 2, a damming member is fixed to the surface of the bearing opposite to the oil reservoir to prevent the lubricating oil from escaping from the bearing.
[0004]
[Patent Document 1]
JP 2001-032914 A
[Patent Document 2]
JP 2001-173762 A
[0005]
[Problems to be solved by the invention]
In the electric drive device as described above, the output shaft of the reduction gear and the drive shaft of the wheel are often coupled by spline fitting. However, such a spline fitting portion tends to increase in the axial sliding due to the axial displacement of the drive shaft accompanying the movement of the wheel. Therefore, there is a problem that the spline fitting portion is worn when the supply of lubricating oil is insufficient.
[0006]
The present invention has been made in view of the above points, and has an object to provide an electric drive device capable of stably lubricating a spline fitting portion between an output shaft of a reduction gear and a drive shaft. To do.
[0007]
[Means for Solving the Problems]
In one aspect of the present invention, an electric drive device is disposed coaxially with an electric motor and a rotation shaft of the electric motor and a drive shaft of a wheel, and transmits a rotation of the electric motor to the drive shaft of the wheel; An oil tank for storing lubricating oil, wherein the speed reducer has a first planetary gear having an element connected to a rotating shaft of the electric motor, a fixed ring gear, and a spline groove on the inner periphery. Planetary carry that is spline-fitted with the spline groove formed on the outer periphery of the drive shaft Ya A second planetary gear having an oil reservoir, an oil reservoir for supplying lubricating oil to the spline groove, and an oil passage for supplying the lubricating oil in the oil tank to the oil reservoir. And the planetary carry of the first planetary gear so as to cover the outer periphery of the pinion gear of the first planetary gear. Ya Fixed to the planetary carrier of the first planetary gear Ya And a scooping ring that scoops up the lubricating oil in the speed reducer to the oil tank as the motor rotates.
[0008]
The electric drive device includes, for example, electric motors provided on both sides of the engine on the front wheel side of the FR vehicle, and further includes a speed reducer that transmits the rotation of the electric motor to the drive shaft of each wheel. Here, the speed reducer includes a planetary carrier that is splined with the drive shaft. An oil reservoir for supplying lubricating oil to the spline groove is provided in the vicinity of the spline fitting portion. Therefore, the spline fitting portion can be stably lubricated by supplying the lubricating oil to the oil reservoir.
[0009]
In one aspect of the electric drive device described above, the oil reservoir is an annular recess formed on the inner peripheral surface of the planetary carrier so as to communicate with the end of the spline groove over the entire circumference of the drive shaft. be able to. As a result, the oil reservoir communicates with the spline grooves formed in the axial direction of the drive shaft, and the lubricating oil can be continuously supplied to all the spline grooves.
[0010]
Another aspect of the electric drive device described above is formed in the vicinity of a coupling portion between the planetary carrier and the drive shaft, and includes a lubricating oil holding portion that holds the lubricating oil, the lubricating oil holding portion, and the oil reservoir. And a lubricating oil passage connecting the planetary carrier so that the lubricating oil moves to the oil reservoir by rotation of the drive shaft. Ya A spiral groove extending from the lubricating oil retaining portion formed on the inner peripheral surface to the oil reservoir can be formed. In this aspect, when the drive shaft and the planetary carrier rotate integrally, the lubricating oil in the lubricating oil holding part enters the spiral groove and moves through the groove to reach an oil reservoir. Thus, the rotation of the drive shaft can be used to continue supplying the lubricating oil to the oil reservoir, and the spline fitting portion can be stably lubricated. The lubricating oil retaining portion includes a main body of the speed reducer, a bearing between the main body of the speed reducer and the planetary carrier, an outer peripheral surface of the drive shaft, a main body of the speed reducer, and the drive shaft. It can be a space constituted by an oil seal provided between the outer peripheral surface
The
[0012]
In another aspect of the electric drive device described above, the drive shaft includes a first oil passage formed in an axial direction at a distal end portion that engages with the planetary carrier, and a first oil passage at a position corresponding to the oil reservoir. A second oil passage extending from one oil passage to the outer peripheral surface in the radial direction of the drive shaft, and the electric motor includes a rotor shaft having a third oil passage formed therein in an axial direction, The second oil passage and the third oil passage can be connected by a pipe in the speed reducer. In this aspect, the front end portions of the rotor shaft and the drive shaft of the electric motor are made hollow, and both are connected by a pipe to be used as an oil passage. Lubricating oil is supplied to the oil reservoir using this oil passage, and the spline fitting portion is lubricated.
[0013]
Another aspect of the electric drive device described above is an oil tank that accumulates lubricating oil, and is fixed to the planetary carrier, and the lubricating oil in the speed reducer is scraped up to the oil tank as the planetary carrier rotates. A scraping ring and a fourth oil passage provided in the electric motor and supplying lubricating oil in the oil tank to a third oil passage in the rotor shaft can be provided. As a result, the lubricating oil accumulated at the bottom of the reducer is scraped up and circulated to the oil tank to lubricate the spline fitting portion.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
[0015]
[Basic configuration of vehicle]
First, a basic configuration of the vehicle 100 according to the present embodiment will be described. In addition, the vehicle 100 according to the present embodiment is an application of the present invention to an FR vehicle (engine front and rear wheel drive system) of 4WD (four wheel drive) specification. However, the application of the present invention is not limited to this, and can also be applied to general FR vehicles and FF vehicles (engine front wheel drive system). Further, since this vehicle is premised on a known 4WD FR vehicle, description of 4WD is omitted.
[0016]
FIG. 1 shows a configuration of a vehicle 100 including a drive unit 8 according to the present invention. FIG. 1 shows a plan view of the vehicle 100. As shown in FIG. 1, the vehicle 100 mainly includes an engine 1, a torque converter 2, a transmission 3, a propeller shaft 4, a differential gear 5, drive shafts 6 and 9, a rear wheel 7, and a front wheel 10. And a drive unit 8, an engine mount 11, and auxiliary machinery 12.
[0017]
The engine 1 is an internal combustion engine that generates power by exploding an air-fuel mixture in a combustion chamber. The reciprocating motion of the piston due to the combustion of the air-fuel mixture in the combustion chamber is converted into the rotational motion of the crankshaft (not shown) via the connecting rod (not shown). The crankshaft transmits power to the rear wheel 7 via the torque converter 2, the transmission 3, the propeller shaft 4, the differential gear 5, and the drive shaft 6.
[0018]
The torque converter 2 is provided between the engine 1 and the transmission 3. The torque converter 2 uses a working fluid such as oil to function as a clutch for intermittently transmitting the rotational torque output from the engine 1 to the transmission 3 and to transmit the rotational torque to the transmission 3 by increasing the rotational torque. It has the function to do.
[0019]
The transmission 3 is provided between the torque converter 2 and the propeller shaft 4 and includes a plurality of gears (planetary gears) corresponding to each of the four forward speeds (first speed to fourth speed) and the first reverse speed. . The transmission 3 operates a hydraulic control device (not shown) based on a command signal from the ECU, thereby performing a shift operation from a low speed to a high speed (shift up) or a shift from a high speed to a low speed (shift down). )I do.
[0020]
The propeller shaft 4 is a propulsion shaft that is provided between the transmission 3 and the differential gear 5 and transmits the driving force obtained from the engine 1 to the rear wheel 7 side.
[0021]
The differential gear 5 is composed of a combination of a plurality of bevel gears, and is a gear that adjusts the rotational speeds of the inner and outer wheels when the vehicle rotates. Specifically, when the vehicle 100 travels on a straight road, the differential gear 5 rotates the left and right front wheels at the same speed. On the other hand, when the vehicle 100 makes a turning motion, a difference between the rotational speeds of the left and right front wheels is generated. Therefore, the differential gear 5 adjusts the rotational speeds thereof to enable a smooth turning motion.
[0022]
The drive shaft 6 is an axle that is rotatably connected to the left and right rear wheels 7. The drive shaft 6 is rotated by a driving force from the engine 1 and transmits power to the rear wheel 7.
[0023]
The drive unit 8 includes, for example, a permanent magnet type synchronous motor that converts electrical energy into mechanical energy, and is provided at a position for driving the left and right front wheels.
[0024]
The drive shaft 9 is an axle that is rotatably connected to the left and right front wheels 10 independently on the left and right. The drive shafts 9 are output shafts of the left and right drive units 8, respectively, and are given drive force independently from each drive unit 8. That is, the left and right front wheels 10 are driven independently by the left and right drive units 8. By making the left and right wheel drive units independent (not connected) in this way, the entire drive unit can be miniaturized, and mounting on the front wheel side of FR vehicles with particularly large space constraints becomes easy.
[0025]
The engine mount 11 is a member that connects the vehicle body and the engine 1 and is provided in the engine room. Examples of the auxiliary machines 12 include an air conditioner compressor.
[0026]
[Basic structure of drive unit]
Next, the basic structure of the drive unit 8 according to the present invention will be described with reference to FIG.
[0027]
FIG. 2A schematically shows the internal structure of the drive unit 8. The drive unit 8 includes a motor unit 20 and a speed reduction unit 40, and is connected to a drive shaft 9 that is an output shaft.
[0028]
The motor unit 20 includes a stator 21, a rotor 22, and a rotor shaft 23. The stator 21 is obtained by winding a coil wire around mild steel or the like, and receives a power supply from the outside to change the magnetic field every moment. The rotor 22 rotates as the magnetic field of the stator 21 changes. The rotation of the rotor 22 is extracted by the rotor shaft 23 and transmitted to the speed reduction unit 40.
[0029]
The speed reduction unit 40 is configured by a gear train in which a first planetary gear 41 and a second planetary gear 42 are combined. FIG. 2B schematically shows the configuration of the gear train. As shown in the figure, the gear train of the speed reduction unit 40 is configured by a combination of a first planetary gear 41 and a second planetary gear 42.
[0030]
In the illustrated gear train, the output from the motor unit 20 is given to the sun gear 41S of the first planetary gear 41 via the rotor shaft 23. The planetary carrier 41C of the first planetary gear 41 is connected to the planetary carrier 42C of the second planetary gear 42, and the ring gear 42R of the second planetary gear 42 is fixed to the casing of the speed reduction unit 40, for example. The planetary carrier 42 </ b> C of the second planetary gear 42 is connected by the drive shaft 9, and the output after deceleration is taken out from the drive shaft 9.
[0031]
Although details will be described later, while the vehicle is traveling, the wheels are displaced in the axial direction of the drive shaft due to the influence of the road surface, etc., so that the planetary carrier 42C and the drive shaft 9 are splined so that the displacement can be absorbed. It has been combined.
[0032]
As can be seen from FIG. 2B, in this gear train, the ring gear 41R of the first planetary gear 41 and the sun gear 42S of the second planetary gear 42 do not contribute to the rotation and can be omitted (shown by broken lines). Thereby, the reduction part 40 can be reduced in weight and size.
[0033]
What is configured in this manner is the gear train inside the speed reduction unit 40 of FIG. In FIG. 2A and the following description, the planetary carriers 41C and 42C of the first and second planetary gears 41 and 42 connected to each other will be referred to as a “connection carrier portion 44”. A stepped pinion gear 45 is used at the connecting portion between the planetary carriers 41C and 42C. The “stepped pinion gear” is a pinion gear formed by integrally molding two pinion gears having different diameters on the same axis. An example of the stepped pinion gear 45 is shown in FIG. 3 (a), and its structure is schematically shown in FIG. 3 (b). As schematically shown in FIG. 3B, the stepped pinion gear 45 is formed by integrally forming a pinion gear portion 41p on the first planetary gear 41 side and a second planetary gear 42p portion.
[0034]
With the above configuration, the rotation of the motor unit 20 is transmitted to the sun gear 41S of the first planetary gear 42 via the rotor shaft 23. The rotation of the sun gear 41S is transmitted to the stepped pinion gear 45. The ring gear 42R of the second planetary gear 42 is fixed, and the rotation of the stepped pinion gear 45 is transmitted to the drive shaft 9 as the rotation of the connecting carrier portion 44 integrated with the stepped pinion gear 45 and output.
[0035]
The present invention relates to a structure for stably lubricating a spline fitting portion between an output shaft of a reduction gear and a drive shaft in a drive unit having the basic configuration as described above.
[0036]
[First embodiment]
Next, a first embodiment of the drive unit according to the present invention will be described. FIG. 4 schematically shows the structure of the drive unit 8a according to the first embodiment. The drive unit 8a is configured based on the basic structure of the drive unit 8 shown in FIG. 2, and specifically includes a motor unit 20 similar to the drive unit 8 shown in FIG. Is the same as that of the drive unit 8. However, the drive unit 8a shown in FIG. 4 has a lubricating oil supply structure for the spline fitting portion between the planetary carrier and the drive shaft, which is the output shaft of the speed reduction portion 40.
[0037]
As shown in FIG. 4, a scraping ring 55 is fixed to the connecting carrier portion 44 in the speed reduction portion 40. An example of the structure of the scraping ring 55 is shown in FIG. The scraping ring 55 includes a rectifying ring 50 and a plurality of scraping members 54 attached to the outer periphery of the rectifying ring 50. As shown in FIG. 4, the rectifying ring 50 is fixed to the connection carrier portion 44 so as to cover the outer periphery of the sun gear 41 </ b> S and the pinion gear portion 41 p of the first planetary gear 41, and rotates as the connection carrier portion 44 rotates. . The pinion gear portion 41p of the stepped pinion gear 45 revolves while rotating around the outer periphery of the sun gear 41S in the rectifying ring 50, and the turbulent flow of lubricating oil generated by the pinion gear portion 41p is retained in the rectifying ring 50. It is prevented that the main flow of the lubricating oil generated on the outside is affected.
[0038]
The scraping member 54 has a role of scraping the lubricating oil accumulated in the speed reduction unit 40 to the oil tank 60. That is, when the scraping ring 55 rotates in accordance with the rotation of the connecting carrier portion 44, the lubricating oil collected by the plurality of scraping members 54 at the bottom of the speed reduction portion 40 is provided on the upper portion of the speed reduction portion 40. Raise to tank 60. Thereby, during the operation of the motor unit 20, the level of the lubricating oil in the motor unit 20 decreases, and drag resistance during rotation of the rotor 22 is reduced.
[0039]
The lubricating oil thus stored in the oil tank 60 is also used for lubricating the spline fitting portion between the planetary carrier 42 </ b> C that is the output shaft in the speed reduction portion 40 and the drive shaft 9. As shown in FIG. 4, the lubricating oil in the oil tank 60 descends from the hole 64 provided in the oil tank 60 by gravity in the oil passage 63 provided in the main body of the speed reduction unit 40 (see arrow 200). ), And is supplied to the lubricating oil holding unit 30 provided at the joint between the speed reduction unit 40 and the drive shaft 9.
[0040]
A cross-sectional structure in the vicinity of the lubricating oil retaining portion 30 is shown in FIG. Hereinafter, description will be given with reference to FIGS. 4 and 6. As well shown in FIG. 6, the lubricating oil retaining unit 30 includes a main body 40a of the speed reduction unit 40, a bearing 31 between the speed reduction unit main body 40a and the planetary carrier 42C, the planetary carrier 42C, the drive shaft 9, A space formed by the oil seal 34. A Z plate 31 a is provided on the opposite side of the bearing 31 from the lubricating oil retaining portion 30. The Z plate 31a prevents the lubricating oil in the lubricating oil holding part 30 from leaking out of the bearing 31 to the outside. On the other hand, on the drive shaft 9 side (right side in the figure) of the lubricating oil holding part 30, the lubricating oil leaks to the outside by the oil seal 34 provided between the speed reducing part main body 40a and the outer peripheral surface of the drive shaft 9. It is preventing. Therefore, as shown by the arrow 210 in FIG. 6, the lubricating oil introduced from the oil passage 63 to the lubricating oil holding unit 30 is restricted from moving in the left-right direction by the Z plate 31 a and the oil seal 34 of the bearing 31, As indicated by an arrow 212, the drive shaft 9 moves to the gap 30a between the planetary carrier 42C.
[0041]
The drive shaft 9 is spline-fitted with the planetary carrier 42C at the front end thereof. The tip end portion 9b of the drive shaft extends over the entire circumference, and a plurality of splines are formed in the horizontal direction in FIG. 6, and no spline is formed on the tip end portion 9a. On the other hand, in the planetary carrier 42C, a spline is formed on the inner wall of the portion corresponding to the tip portion 9b. Therefore, the planetary carrier 42C and the drive shaft 9 are spline-fitted at the tip 9b of the drive shaft. A space (groove) formed by fitting the spline of the drive shaft 9 and the spline of the planetary carrier 42C is referred to as a spline groove. Thereby, the rotation of the planetary carrier 42C is transmitted to the drive shaft 9, and the drive shaft 9 rotates (see arrow 202). The displacement in the direction of the arrow 201 that occurs in the drive shaft 9 due to the influence of the road surface or the like while the vehicle is traveling is absorbed by the spline fitting.
[0042]
On the inner wall of the planetary carrier 42C, a spiral groove 35 is formed at a portion corresponding to the tip portion 9a of the drive shaft 9, and an oil reservoir 32 is provided over the entire circumference at a portion corresponding to the boundary between the tip portions 9a and 9b. Is formed. The lubricating oil that has entered the gap 30a from the lubricating oil holding part 30 enters the helical groove 35, and when the drive shaft 9 and the planetary carrier 42C rotate integrally in the direction of the arrow 202, the inside of the helical groove 35 is indicated by the arrow 213. Proceeds to the back, that is, to the left in the figure (see arrow 213) and eventually reaches the oil sump 32. Since the oil reservoir 32 is provided in an annular shape so as to correspond to the entire circumference of the drive shaft 9, lubricating oil is supplied to all the spline grooves 37 in the tip end portion 9 b of the drive shaft 9 (see arrow 214). An O-ring 38 is provided on the outer periphery of the tip end portion 9 b of the drive shaft 9 to prevent leakage of the lubricating oil introduced into the spline groove 37.
[0043]
As described above, in the first embodiment, the lubricating oil in the oil tank 60 provided in the upper part of the speed reduction unit 40 is introduced into the lubricating oil holding unit 30, and the joint between the planetary carrier 42 </ b> C and the drive shaft 9 is introduced. Guide from the gap 30a to the spline fitting part. Specifically, the lubricating oil that has moved to the annular oil reservoir 32 through the spiral groove 35 provided on the inner periphery of the planetary carrier 42 </ b> C is supplied to the spline grooves provided on the entire periphery of the drive shaft 9. Accordingly, the lubricating oil is supplied to the oil reservoir 32 by utilizing the rotation of the drive shaft 9 and the planetary carrier 42C, and the spline fitting portion is stably lubricated.
[0044]
[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the present embodiment, the rotor shaft 23 of the motor unit 20 is hollow, and the lubricating oil stored in the oil tank 60 is moved inside the rotor shaft 23 to lubricate the spline fitting portion between the planetary carrier 42C and the drive shaft 9. To do.
[0045]
FIG. 7 schematically shows the configuration of the drive unit 8b according to the second embodiment. The drive unit 8b of the second embodiment also basically has the basic structure shown in FIG. The motor unit 20 includes a stator 21 and a rotor 22, and the rotor shaft 23 is formed hollow to allow lubricating oil to pass therethrough. The speed reduction unit 40 includes the same gear train as in FIG. 2, the rotor shaft 23 of the motor unit 20 is connected to the sun gear 41S, and the planetary carrier 42C is connected to the drive shaft 9 by spline fitting.
[0046]
An oil tank 60 is provided above the motor unit 20 and the speed reduction unit 40. Further, a scraping ring 55 similar to that of the first embodiment is provided on the motor unit 20 side of the connecting carrier unit 44, and the lubricating oil accumulated at the bottom of the speed reduction unit 40 is scraped up to the oil tank 60.
[0047]
FIG. 8 shows the structure in the vicinity of the spline fitting portion between the planetary carrier 42C and the drive shaft 9. Hereinafter, description will be given with reference to FIGS. A lubricating oil retaining portion 30 is formed at the joint between the planetary carrier 42C and the drive shaft 9 as in the first embodiment. The lubricating oil holding part 30 is a space formed by the speed reducing part main body 40 a, the bearing 31, the planetary carrier 42 </ b> C, the drive shaft 9, and the oil seal 34. A Z plate 31 a is attached to the bearing 31 to prevent the lubricating oil in the lubricating oil holding part 30 from leaking through the bearing 31. However, in the present embodiment, unlike the first embodiment, the supply of the lubricating oil to the lubricating oil holding unit 30 is performed through the oil passages inside the rotor shaft 23 and the drive shaft 9. Therefore, unlike the first embodiment, the oil passage (oil passage 63) from the oil tank 60 is not formed in the lubricating oil holding unit 30.
[0048]
In the present embodiment, the rotor shaft 23 formed hollow as described above extends through the center of the sun gear 41S to the vicinity of the planetary carrier 42C. On the other hand, the front end portions 9a and 9b of the drive shaft 9 are also formed hollow. Then, as well shown in FIG. 8, a pipe 70 serving as an oil passage is fixed inside either the rotor shaft 23 or the drive shaft 9. Since the rotor shaft 23 and the drive shaft 9 rotate independently, the pipe 70 is fixed to only one of them, but the pipe 70 is not fixed so that the lubricating oil does not leak at the connection portion of the pipe 70. It is inserted in a sealed state inside the other.
[0049]
The planetary carrier 42C has a spline formed in a region corresponding to the tip portion 9b of the drive shaft 9, and an annular oil reservoir 32 formed in a portion corresponding to the boundary between the tip portions 9a and 9b.
[0050]
The drive shaft 9 has a spline formed at the tip end portion 9b, and is fitted with the spline of the planetary carrier 42C. The tip portion 9a is not formed with a spline. An O-ring 38 is provided at the tip of the spline groove 37 (end on the motor unit 20 side) to prevent leakage of the lubricating oil. The drive shaft 9 is formed with an oil passage 39a at the boundary between the tip portions 9a and 9b, and an oil passage 39b leading to the lubricating oil holding portion 30 is formed at the end of the tip portion 9a. .
[0051]
Next, the lubrication of each part will be described. The lubricating oil in the oil tank 60 provided above the motor unit 20 and the speed reduction unit 40 enters the oil passage 26 inside the rotor shaft 23 through the oil passage 61 by gravity, and the inside of the rotor shaft 23 is shown by an arrow 217 in FIG. Move along. The oil passage 26 inside the rotor shaft 23 and the oil passage 25 inside the drive shaft 9 are connected by the pipe 70 described above, and the lubricating oil passes through the pipe 70 and enters the oil passage 25 inside the drive shaft 9. A part of the lubricating oil enters the oil reservoir 32 through an oil passage 39 a formed in the drive shaft 9, and lubricates each spline groove 37 on the entire circumference of the drive shaft 9. As a result, the planetary carrier 42C and the spline fitting portion of the drive shaft 9 are lubricated.
[0052]
Further, part of the lubricating oil that has entered the oil passage 25 inside the drive shaft 9 enters the lubricating oil holding portion 30 through the oil passage 39 b formed in the drive shaft 9 and moves in accordance with the arrow 219. Thereby, the lubrication of the bearing 31 between the reduction part main body 40a and the planetary carrier 42C is performed.
[0053]
The oil passages 39a and 39b formed in the drive shaft 9 may be one in the circumferential direction or plural. Since the drive shaft 9 rotates at a high speed, for example, in the direction of the arrow 202 in the figure, the lubricating oil that has entered the oil passage 25 of the drive shaft 9 is subjected to centrifugal force due to the rotation of the drive shaft 9 and easily passes through the oil passages 39a and 39b. And enters the oil reservoir 32 and the lubricating oil holding part 30.
[0054]
Compared with the first embodiment, the present embodiment does not require the oil passage 63 from the oil tank 60 to the lubricating oil retaining portion 30, so the shape of the speed reduction portion main body 40 a on the drive shaft 9 side can be reduced in size. .
[0055]
【The invention's effect】
As described above, in the electric drive device of the present invention, it is possible to stably lubricate the spline fitting portion between the planetary carrier of the speed reduction portion and the drive shaft without using a dedicated oil pump or the like.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a vehicle equipped with an electric drive device according to the present invention.
FIG. 2 is a diagram showing a basic structure of a drive unit.
FIG. 3 is a diagram showing a configuration of a stepped pinion gear.
FIG. 4 is a diagram illustrating a schematic configuration of a drive unit according to the first embodiment.
FIG. 5 is a diagram showing an example of a scraping ring.
FIG. 6 is a diagram showing a configuration around a spline fitting portion of a planetary carrier and a drive shaft of the drive unit according to the first embodiment.
FIG. 7 is a diagram illustrating a schematic configuration of a drive unit according to a second embodiment.
FIG. 8 is a diagram showing a configuration around a spline fitting portion of a planetary carrier and a drive shaft of a drive unit according to a second embodiment.
[Explanation of symbols]
1 engine
8 Drive unit
20 Motor part
21 Stator
22 Rotor
23 Motor shaft
30 Lubricating oil holding part
40 Reducer
44 Connection carrier part
45 stepped pinion gear
50 Rectifier ring
55 Scoop ring
60 Oil tank

Claims (7)

An electric motor,
A speed reducer that is arranged coaxially with the rotating shaft of the motor and the drive shaft of the wheel, and that transmits the rotation of the motor to the drive shaft of the wheel;
An oil tank for storing lubricating oil, and
The speed reducer is
A first planetary gear having an element coupled to the rotating shaft of the electric motor;
A fixed ring gear, a planetary carrier Ya spline-fitted between the spline groove formed on the outer periphery of the drive shaft has a spline groove on the inner periphery, and a second planetary gear having,
An oil sump formed at a position communicating with the spline groove and supplying lubricating oil to the spline groove;
An oil passage for supplying lubricating oil in the oil tank to the oil reservoir;
Is fixed to the planetary carrier Ya of the first planetary gear so as to cover the outer periphery of the pinion gear of the first planetary gear, the lubricating oil of the reduction gear with the rotation of the planetary carrier Ya of the first planetary gear scraped into the oil tank A scraping ring,
An electric drive device comprising:   2. The electric drive device according to claim 1, wherein the oil sump is an annular recess formed on an inner peripheral surface of the planetary carrier so as to communicate with an end portion of the spline groove over the entire circumference of the drive shaft. A lubricating oil holding portion that is formed in the vicinity of the coupling portion between the planetary carrier and the drive shaft, and holds the lubricating oil;
A lubricating oil passage connecting the lubricating oil holding part and the oil reservoir,
The lubricating oil passage, as the lubricating oil by the rotation of the drive shaft is moved to the reservoir the oil, helix leading to reservoir the fluid from the planetary carrier the lubricant holding portion formed on the inner peripheral surface of the Ya The electric drive device according to claim 1, wherein the electric drive device is a groove.   The lubricating oil retaining portion includes a main body of the speed reducer, a bearing between the main body of the speed reducer and the planetary carrier, an outer peripheral surface of the drive shaft, an outer peripheral surface of the main body of the speed reducer, and the drive shaft. The electric drive device according to claim 3, wherein the electric drive device is a space formed by an oil seal provided therebetween. The drive shaft has a first oil passage formed in an axial direction at a tip portion engaged with the planetary carrier, and an outer periphery in a radial direction of the drive shaft from the first oil passage at a position corresponding to the oil reservoir. A second oil passage extending to the surface,
The electric motor includes a rotor shaft having a third oil passage formed axially therein.
3. The electric drive device according to claim 1, wherein the second oil passage and the third oil passage are connected by a pipe in the speed reducer.   6. An electric drive device according to claim 5, further comprising: a fourth oil passage provided in the electric motor and configured to supply lubricating oil in the oil tank to a third oil passage in the rotor shaft. The scraping ring includes a plurality of scraping members on the outer periphery,
Wherein the planetary carrier Ya of the first planetary gear, the planetary carrier Ya of the second planetary gear are connected to each other,
The electric drive device according to claim 1, wherein a sun gear of the first planetary gear is connected to an output shaft of the electric motor.

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