JP4639591B2 - Axle drive - Google Patents

Description

  The present invention relates to an axle drive device that drives an axle that rotates a drive wheel of a vehicle by an electric motor.

  Conventionally, there is a vehicle that uses an electric motor as a drive source of drive wheels. For example, as this type of vehicle, a hybrid vehicle using both an internal combustion engine and an electric motor as a drive source, an electric vehicle using an electric motor as a drive source, and further driving the internal combustion engine with one drive wheel (for example, a front wheel) There is a four-wheel drive vehicle using an electric motor as a power source and a drive source of the other drive wheel, and in each of them, an axle drive device that includes an electric motor and drives an axle connected to the drive wheel is provided. It has been.

  As a conventional axle drive device, for example, there is one having a three-shaft configuration (a motor shaft 101a, a counter shaft 104, and a differential shaft 107 shown below) as shown in FIGS. The axle drive device includes an electric motor 101, a counter drive gear 102 fixed to an output shaft (hereinafter referred to as “motor shaft”) 101 a of the electric motor 101, and a counter driven gear meshed with the counter drive gear 102. 103, a counter shaft 104 which is a rotation axis of the counter driven gear 103, a final drive gear 105 fixed to the counter shaft 104, a final driven gear 106 meshed with the final drive gear 105, and the rotation of the final driven gear 106 And a differential shaft 107 that transmits the power to the axle 110.

  Further, in this axle drive device, the gear group and the like as described above are stored in the case 108. Therefore, as shown in FIG. 6, oil that cools and lubricates them (hereinafter referred to as "lubricating oil"). L is stored in the lower part of the case 108. In this lubricating oil L, the lower part of the final driven gear 106 having the largest diameter in the gear group is immersed.

  When the electric motor 101 is driven by an electronic control unit (ECU) of the vehicle, the axle drive device having such a configuration is configured such that the electric motor 101 passes through the counter drive gear 102, the counter driven gear 103, the final drive gear 105, and the final driven gear 106. The driving force is transmitted to the axle 110 and the wheels 111.

  At that time, the rotating final driven gear 106 scoops up the lubricating oil L stored in the lower part of the case 108. The lubricated oil L thus scraped is transmitted through the meshing surfaces of the gears 102, 103, 105 and scattered, while lubricating and cooling the gears 102, 103, 105, 106 and the shafts 101a, 104, 107, etc. I do. Further, the scraped lubricating oil L is stored in the reservoir tank 109 shown in FIG. 6 while being scattered in the case 108.

JP-A-9-226394 JP 2001-112210 A

  Here, the axle drive device having the three-shaft configuration as described above generally performs lubrication and cooling, and supply to the reservoir tank 109 using the scooping of the lubricating oil L by the final driven gear 106 having the maximum gear diameter. . For this reason, in this type of axle drive device, as shown in FIGS. 5 and 6, the motor shaft 101a is disposed on the front side of the vehicle with respect to the differential shaft 107 (that is, the electric motor 101 is disposed on the front side of the vehicle). To do).

  However, if the electric motor 101 is arranged in such a positional relationship, the electric motor 101 and the case 108 may interfere with the suspension components (such as the suspension member 120 and the stabilizer 121) and the fuel tank 130 when mounted on the vehicle. is there.

  Here, as a countermeasure against such interference, it is conceivable to change the shape of the suspension component and the fuel tank 130. However, since the suspension component is a component that guarantees the steering stability performance and the riding comfort performance, it is easy to change the shape. Impossible. In addition, the fuel tank 130 must have a capacity for achieving the target cruising distance of the vehicle, and therefore cannot be easily reduced.

  Therefore, as shown in FIG. 7 and FIG. 8, it is conceivable to arrange the electric motor 101 on the rear side of the vehicle and to arrange the final driven gear 106 on the front side of the vehicle, thereby avoiding the interference as described above.

  However, in the axle drive device of this arrangement, as shown in FIG. 8, the lubricating oil L scooped up by the final driven gear 106 is blocked by the final drive gear 105 to lubricate and cool the gear group and the like, and to the reservoir tank 109. Inconvenience that it is not possible to supply. Therefore, in order to perform lubrication and cooling of the gear group and the like in the axle drive device shown in FIGS. 7 and 8, an oil pump (not shown) must be provided, which increases the size of the axle drive device. New inconveniences such as rising costs will be incurred.

  Therefore, the present invention improves the disadvantages of the conventional example, can avoid interference with peripheral components such as suspension components, and requires lubrication and cooling even when the electric motor is disposed on the rear side of the vehicle. It is an object of the present invention to provide an axle drive device that can lubricate and cool components such as a gear group and can supply lubricating oil to a reservoir tank at low cost without increasing the size.

In order to achieve the above object, according to the first aspect of the present invention, the motor shaft of the electric motor as the drive source, the counter shaft as the counter shaft, and the differential shaft connected to the vehicle axle, and the three shafts A gear group that is fixed to any of the gears and transmits a driving force of the electric motor to the axle, and the motor shaft is disposed on the vehicle rear side of the differential shaft. A gear having a gear disposed on the shaft, a storage chamber for storing lubricating oil in the lower portion of the case in the case, and a gear on the counter shaft that is only immersed in the lubricating oil in the storage chamber in the gear group And a reservoir tank for storing the lubricating oil scooped up by the above, and an oil guide wall for guiding the lubricating oil in the storage chamber swept up by the gear on the counter shaft to the reservoir tank.

  As a result, interference with peripheral parts can be avoided, and the lubrication and cooling of components such as gear groups and the supply of lubricating oil to the reservoir tank can be simplified and inexpensive without increasing the size of the axle drive device. Can be performed.

  In order to achieve the above object, in the invention according to claim 2, in the axle drive device according to claim 1, the lowermost end of the gear on the countershaft immersed in the lubricating oil in the storage chamber, It arrange | positions so that it may be located below the lowest end of the gear with the largest diameter in the said gear group.

  Thereby, the stirring resistance of the lubricating oil is reduced, and the driving force transmission efficiency in the gear group is further improved.

  In order to achieve the above object, according to a third aspect of the present invention, in the axle drive device according to the first or second aspect, the counter in which a helical gear having a twist angle is immersed in the lubricating oil in the storage chamber. The oil guide wall is provided as a gear on the shaft, and the oil guide wall is a first oil guide surface having a surface facing the tooth surface of the gear on the counter shaft, and a surface facing the outer portion of the side surface of the gear on the counter shaft. And a second oil guiding surface extending from the first oil guiding surface.

As a result, the efficiency of scraping the lubricating oil is improved and the efficiency of supplying the lubricating oil to the reservoir tank is also improved, so that the oil level of the lubricating oil in the storage chamber can be lowered, and the stirring resistance in the gear group can be further reduced. . Here, as in the invention described in claim 4, it is desirable that the motor shaft, the counter shaft, and the differential shaft are arranged so that their axial directions are orthogonal to the vehicle longitudinal direction. The reservoir tank preferably includes a guide portion for supplying lubricating oil in the reservoir tank to a gear that is not meshed with the gear on the countershaft. Lubricating oil can be supplied to the gears.

  The axle drive device according to the present invention not only can avoid interference with peripheral components, but can also reliably perform lubrication and cooling of components such as a gear group, and supply lubricating oil to the reservoir tank. In addition, the axle drive device can be made inexpensively with a simple structure without increasing the size.

  Embodiments of an axle drive device according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to the embodiments.

  A first embodiment of an axle drive device according to the present invention will be described with reference to FIGS.

  The axle drive device of the first embodiment is driven by using the electric motor 1 shown in FIG. 1 arranged on the rear side of the vehicle as a drive source, similarly to the axle drive device shown in FIG. 7 where the electric motor 101 is arranged on the rear side of the vehicle. 110 and three wheels (the motor shaft 1a, the counter shaft 4, and the differential shaft 7) configured to drive the wheels 111.

  First, as shown in FIG. 1, the electric motor 1 as a drive source is such that its motor shaft 1a (one shaft) is located on the vehicle rear side with respect to the differential shaft 7 (here, the most among the three shafts in the case 8). It is fixed to the case 8 so that it is located behind the vehicle. Thus, by arranging the electric motor 1 on the vehicle rear side, it is possible to avoid interference with peripheral components such as suspension components.

  Further, the axle drive device includes a counter drive gear 2 fixed to the motor shaft 1 a, a counter driven gear 3 meshed with the counter drive gear 2, and a counter shaft 4 of the counter driven gear 3. (Two shafts), a final drive gear 5 fixed to the counter shaft 4, a final driven gear 6 meshed with the final drive gear 5, and a differential shaft 7 that transmits the rotation of the final driven gear 6 to the axle 110 ( (3 axes).

  In the first embodiment, the counter drive gear 2 and the counter driven gear 3 are arranged on the left side of the vehicle, and the final drive gear 5 and the final driven gear 6 are arranged on the right side of the vehicle.

  Lubricating oil L for lubricating and cooling the components housed in the case 8 such as the gears 2, 3, 5, 6 and the shafts 1 a, 4, 7 is stored in the lower part of the case 8. Yes. Here, in the first embodiment, as shown in FIG. 2, the counter driven gear 3 is arranged so that the lowermost end thereof is located below the lowermost ends of the other gears 2, 5 and 6. The lubricating oil L is scraped up by the counter driven gear 3. Therefore, a storage chamber 8a for storing the lubricating oil L is formed below the counter driven gear 3 in the case 8, and the lower portion of the counter driven gear 3 is immersed in the lubricating oil L of the storage chamber 8a.

  Thus, by making the lowermost end of the counter driven gear 3 lower than the lowermost ends of the other gears 2, 5, 6, the lubricating oil L can be scraped up only by the counter driven gear 3, and the final driven gear having a large gear diameter is obtained. The stirring resistance is reduced as compared with the conventional case of scraping up at 6. This can also improve the driving force transmission efficiency in the gear group.

  A reservoir tank 9 is provided in the case 8 on the rear side of the vehicle and on the upper side of the storage chamber 8a. The reservoir tank 9 is a tank for storing the lubricating oil L scraped up by the counter driven gear 3 as will be described later, in order to reduce the oil level of the storage chamber 8a to the minimum necessary level (that is, the oil To reduce the agitation loss of the gear group when the vehicle is running due to the level being too high).

  Here, in this reservoir tank 9, the lubricating oil L scraped up by the counter driven gear 3 is guided into the tank, and further, the lubricating oil L in the tank is supplied to a gear group or the like (particularly the final drive gear 5). The guide portion 9a extends from the storage wall 9b. As shown in FIG. 2, the guide portion 9 a according to the first embodiment has a plate shape that is curved toward the vehicle upper side, and its end portions are directed to the final drive gear 5 and the counter shaft 4.

  For this reason, the lubricating oil L in the tank is supplied to the final drive gear 5 and the counter shaft 4 by front and rear pitching or the like when the vehicle is running, and these are lubricated and cooled. Further, since the lubricating oil L is also supplied to the final driven gear 6 via the tooth surface of the final drive gear 5, the final driven gear 6 is also lubricated and cooled.

  The guide portion 9a may be formed so that the end portion thereof faces the meshing surface between the final drive gear 5 and the final driven gear 6, thereby directly lubricating and cooling both the gears 5 and 6. Can do.

  Further, in the first embodiment, as shown in FIG. 2, the guide portion 9 a is disposed above the counter drive gear 2 so as to wrap the counter drive gear 2, so that the lubricating oil L is supplied to the counter drive gear 2. It cannot be performed from the guide portion 9a. However, in the first embodiment, the lubricating oil L is supplied through the tooth surface of the counter driven gear 3 that meshes with the counter drive gear 2, and the counter drive gear 2 is lubricated and cooled.

  Here, the counter driven gear 3 of the first embodiment is a helical gear (helical gear) in which teeth having a torsion angle directed diagonally forward to the left of the vehicle are formed as shown in FIG. Since it rotates clockwise as shown in FIG. 2 when viewed from the side, most of the scraped lubricating oil L is scattered toward the front of the vehicle and diagonally left front. For this reason, in order to prevent the scattering and supply the lubricating oil L to the reservoir tank 9 at the rear of the vehicle, the lubricating oil L that has been scraped up is transferred to the reservoir tank 9 at the rear of the vehicle. An oil guiding wall 10 shown in FIG. 2 is provided.

  The oil guide wall 10 of the first embodiment includes a plate-like curved portion 10a facing the tooth front surface of the counter-driven gear 3 on the front side of the vehicle with a space therebetween, and an obliquely upward rearward of the vehicle from the upper end of the curved portion 10a. Toward the upper side of the guide portion 9a, and is erected on the inner wall surface of the case 8 facing the side surface of the counter driven gear 3 on the left side of the vehicle. For example, the plate-like member composed of the curved portion 10a and the extending portion 10b may be a separate member from the case 8 fixed to the inner wall of the case 8 with bolts, nuts, or the like. It may be formed integrally with the.

  This plate-shaped member guides the lubricating oil L scooped up by the counter-driven gear 3 to the front of the vehicle to the reservoir tank 9, but in order to guide the lubricating oil L to the reservoir tank 9 more efficiently, the front left diagonally forward of the vehicle It is preferable that the lubricating oil L scraped up is also guided to the reservoir tank 9. For this reason, the oil guide wall 10 is provided with an oil guide surface capable of covering at least the outer portion in front of the left side surface of the counter driven gear 3 and the upper portion of the guide portion 9a. The oil guide surface is disposed with a space from the left side surface of the counter driven gear 3.

  Here, since the plate-shaped member of the first embodiment is erected from the inner wall surface of the case 8, the inner wall surface is used as the oil guiding surface. That is, the oil guiding wall 10 of the first embodiment is configured by a plate-like member composed of the curved portion 10 a and the extending portion 10 b and the inner wall surface of the case 8.

  Thus, by making the counter driven gear 3 a helical gear, the scraping efficiency of the lubricating oil L is improved, and the lubricating oil L is guided by the two wall surfaces to improve the lubricating oil supply efficiency to the reservoir tank 9. Therefore, the oil level of the lubricating oil L in the storage chamber 8a can be lowered. Thus, the stirring loss in the gear group can be further reduced.

  When the electric motor 1 is driven by the electronic control unit (ECU) of the vehicle, the axle drive device of the first embodiment shown above passes through the counter drive gear 2, the counter driven gear 3, the final drive gear 5, and the final driven gear 6. Thus, the driving force of the electric motor 1 is transmitted to the axle 110 and the wheels 111.

  At that time, the counter-driven gear 3 that rotates clockwise scoops up the lubricating oil L in the storage chamber 8a toward the front of the vehicle and diagonally forward to the left. The scooped up lubricating oil L is guided to the oil guiding wall 10 and stored in the reservoir tank 9. Specifically, in the second embodiment, the lubricating oil L scooped up in front of the vehicle is an oil guide surface (first oil guide surface) of a plate-like member formed of the curved portion 10a and the extended portion 10b in the oil guide wall 10. The lubricating oil L guided by the surface) and scraped up to the left front of the vehicle is guided by the inner wall surface (second oil guiding surface) of the case 8.

  Here, the counter-driven gear 3 scatters the lubricating oil L from the tooth surfaces and side surfaces thereof, but the lubricating oil L remains in such portions. For this reason, lubrication with the counter drive gear 2 is performed by the lubricating oil L remaining on the tooth surfaces, and the counter drive gear 2 is further cooled.

  Further, the vehicle during traveling is subject to longitudinal pitching and vertical movement due to acceleration and deceleration. For this reason, if the lubricating oil L in the reservoir tank 9 is stored to a full tank or a height close thereto, the lubricating oil L is moved from the reservoir tank 9 through the guide portion 9a by the operation of pitching or the like. 5 and the counter shaft 4 (in the first embodiment, it is also supplied to the counter driven gear 3). As a result, the final drive gear 5 and the final driven gear 6 are lubricated, and the final drive gear 5, the final driven gear 6 and the counter shaft 4 are cooled.

  Such an axle drive device according to the first embodiment includes a hybrid vehicle using both the internal combustion engine and the electric motor as drive sources, an electric vehicle using the electric motor as a drive source, and the internal combustion engine as one drive wheel (for example, a front wheel). The present invention is applied to a vehicle such as a four-wheel drive vehicle using an electric motor as a drive source and a drive source of the other drive wheel.

  Here, the axle driving device of the first embodiment is exemplified as for driving the rear wheel of the vehicle, but may be used for driving the front wheel.

  As described above, in the axle drive device of the first embodiment, since the electric motor is disposed on the rear side of the vehicle, it is possible to avoid interference with peripheral components as minimum requirements for mounting on the vehicle. Can do. And even if it arrange | positions in such an electric motor, the lubricating oil L can be supplied to the reservoir tank 9 by the oil guide wall 10, and components, such as a gear group in the case 8, can be lubricated and cooled. . Furthermore, since a lubricating oil supply device such as an oil pump for supplying the lubricating oil L to the reservoir tank 9 and the components is not required, it is possible to reduce the cost without increasing the size of the axle driving device.

  In the first embodiment, the oil guide wall 10 is constituted by the plate-shaped member formed of the curved portion 10a and the extending portion 10b and the inner wall surface of the case 8, but the oil guide wall is not necessarily in this mode. It is not limited to. For example, when the inner wall surface of the case 8 cannot be used as a part of the oil guiding wall, the oil guiding surface described above may be erected from the plate-like member. In such a case, the standing member functioning as the oil guide surface may be erected from the left side end of the plate-like member, or erected from the surface of the plate-like member facing the tooth surface of the counter driven gear 3. May be. That is, the oil guide wall in this case may be composed of a curved portion having an approximately L-shaped cross section and an extending portion, or may be composed of a curved portion having an approximately T-shaped cross section and an extending portion. Good.

  Further, in the first embodiment, the counter driven gear 3 having the torsion angle teeth facing diagonally forward to the left of the vehicle is disposed, but the shape of the oil guiding wall varies depending on the shape of the tooth surface. For example, if the counter-driven gear 3 is a helical gear having teeth facing diagonally forward to the right of the vehicle with respect to the axial direction, the counter-driven gear 3 is arranged with a space from the side surface of the counter-driven gear 3 on the right side of the vehicle. What is necessary is just to prepare the oil guide wall which consists of the said standing member. Further, if the counter driven gear 3 is a spur gear (spur gear) with teeth cut in the axial direction, the oil guide wall may be constituted only by the plate-like member composed of the curved portion 10a and the extending portion 10b.

  Next, a second embodiment of the axle drive device according to the present invention will be described with reference to FIGS.

  The axle drive device of the second embodiment has a three-shaft configuration (motor shaft 21a, counter shaft 24, differential shaft 27) in which the electric motor 21 serving as a drive source is arranged on the vehicle rear side of the case 28, as in the first embodiment. The major difference from the first embodiment is the arrangement of the gears 22, 23, 25, and 26 in the case 28 in the left-right direction of the vehicle.

  That is, in the second embodiment, as shown in FIG. 3, the counter drive gear 22 fixed to the motor shaft 21 a and the counter driven gear 23 that meshes with the counter drive gear 22 are on the right side of the vehicle and are the same as the counter driven gear 23. This embodiment differs from the first embodiment in that a final drive gear 25 fixed to the counter shaft 24 and a final driven gear 26 that meshes with the final drive gear 25 are arranged on the left side of the vehicle. The second embodiment is also different in that the counter driven gear 23 has a torsional angle toward the front right of the vehicle.

  As described above, in the second embodiment, the arrangement of the gears 22, 23, 25, and 26 is different from that in the first embodiment, but as shown in FIG. 4, the lubricating oil L in the storage chamber 28a in the case 28 is used. The counter driven gear 23 fixed to the middle counter shaft 24 among the three shafts is dipped and scraped up as in the first embodiment. Therefore, the oil guiding wall 30 of the second embodiment is provided on the right side of the vehicle as shown in FIG.

  Further, the counter-driven gear 23 of the second embodiment has a twist angle with its teeth directed obliquely forward to the right side of the vehicle as described above, and as shown in FIG. 4 when the axle driving device is viewed from the left side of the vehicle. Since it rotates clockwise, the scraped-up lubricating oil L is scattered toward the front of the vehicle and diagonally forward to the right. For this reason, the oil guiding wall 30 is disposed at a distance from the counter-driven gear 23 on the vehicle front side.

  First, similar to the oil guide wall 10 of the first embodiment, the oil guide wall 30 includes a plate-like curved portion 30a opposed to the tooth surface of the counter driven gear 23 on the front side of the vehicle with a space therebetween, and the curved portion. It has a plate-like member comprising a plate-like extending portion 30b extending from the upper end of 30a to the rear of the vehicle and obliquely upward to the upper portion of the guide portion 29a. For this reason, the lubricating oil L scraped up to the front of the vehicle by the counter driven gear 23 is guided to the reservoir tank 29 at the rear of the vehicle.

  Here, the plate-like member may be a separate member fixed to the inner wall of the case 28 with a bolt, a nut, or the like, or may be integrally formed on the inner wall surface of the case 28. .

  Next, in order to more effectively guide the lubricating oil L to the reservoir tank 29, the oil guiding wall 30 according to the second embodiment preferably guides the lubricating oil L scraped up to the right front of the vehicle to the reservoir tank 29. . For this reason, an oil guide surface capable of covering at least the outer portion of the counter driven gear 23 in front of the right side surface and the upper portion of the guide portion 29a is provided at a distance from the vehicle right side surface of the counter driven gear 23. . Here, even in the oil guiding wall 30 of the second embodiment, the inner wall surface of the case 8 is used as the oil guiding surface.

  In such an axle drive device of the second embodiment, during the driving, the counter driven gear 23 that rotates clockwise scoops up the lubricating oil L in the storage chamber 28a toward the front of the vehicle and diagonally forward to the right. The lubricant L that has been scraped up to the front of the vehicle is guided by the plate-like member of the oil guide wall 30, and the lubricant that has been scraped up to the right front of the vehicle by the inner wall surface of the case 8. It is guided and stored in the reservoir tank 29.

  Further, if the lubricating oil L of the reservoir tank 29 is stored up to a full tank or a height close thereto, the vehicle is lubricated from the reservoir tank 29 through the guide portion 29a by the vehicle pitching operation or the like as in the first embodiment. Oil L is supplied to the final drive gear 25 and the counter shaft 24. Therefore, lubrication between the final drive gear 25 and the final driven gear 26 becomes possible, and further, the final drive gear 25, the final driven gear 26, and the counter shaft 24 can be cooled.

  Furthermore, the counter drive gear 2 is lubricated and cooled by the lubricating oil L remaining on the tooth surfaces of the counter driven gear 23 as in the first embodiment.

  As described above, even in the axle drive device according to the second embodiment, it is possible to avoid interference with peripheral parts as in the first embodiment, and to supply the lubricating oil L to the reservoir tank 29. Lubrication and cooling of components such as a gear group housed in the case 28 can be performed. Further, since a lubricating oil supply device such as an oil pump is not required, the cost of the vehicle can be kept low without increasing the size of the axle drive device.

  In the second embodiment, the oil guide wall 30 is configured by the plate-like member formed of the curved portion 30a and the extended portion 30b and the inner wall surface of the case 28. However, the oil guide wall is not necessarily in this mode. It is not limited to. For example, when the inner wall surface of the case 28 cannot be used as a part of the oil guiding wall, a standing member similar to that of the first embodiment may be provided on the right side of the counter driven gear 3 with a gap.

  Further, in the second embodiment, the counter driven gear 23 having the torsion angle teeth facing diagonally forward to the right of the vehicle is disposed, but the shape of the oil guiding wall varies depending on the shape of the tooth surface. For example, if the counter-driven gear 23 is a helical gear having teeth facing diagonally left front of the vehicle with respect to the axial direction thereof, the above-mentioned standing member disposed with a space between the plate-like member and the counter-driven gear 23 on the left side of the vehicle An oil guide wall consisting of Further, if the counter driven gear 23 is a spur gear (spur gear), the oil guide wall may be constituted only by a plate-like member composed of the curved portion 30a and the extended portion 30b.

  As described above, the axle drive device according to the present invention is useful for countermeasures against interference with peripheral components, and in particular, a reduction in lubrication performance and cooling performance of gear groups and the like due to the electric motor being disposed on the vehicle rear side. This is suitable for easily and inexpensively avoiding the deterioration of the lubricating oil supply performance to the reservoir tank.

It is the skeleton figure which looked at Example 1 of the axle drive device concerning the present invention from the vehicles upper part. It is the skeleton figure which looked at the axle drive device of Example 1 from the vehicle left side. It is the skeleton figure which looked at Example 2 of the axle drive device concerning the present invention from the vehicles upper part. It is the skeleton figure which looked at the axle drive device of Example 2 from the vehicle left side. It is the skeleton figure which looked at the conventional axle drive device in which the electric motor was arranged in the vehicle front side from the vehicle upper part, and is a figure showing the state where this axle drive device was mounted in the vehicle. It is the skeleton figure which looked at the conventional axle shaft drive device with which the electric motor was arranged at the vehicle front side from the vehicle left side. It is the skeleton figure which looked at the conventional axle drive device with which the electric motor was arranged on the vehicles back side from the vehicles upper part, and is a figure showing the state where this axle drive device was carried in the vehicles. It is the skeleton figure which looked at the conventional axle drive device with which the electric motor was arranged at the vehicle back side from the vehicle left side.

Explanation of symbols

1,21 Electric motor 1a, 21a Motor shaft (1 axis)
2,22 Counter drive gear 3,23 Counter driven gear 4,24 Counter shaft (2 shafts)
5,25 Final drive gear 6,26 Final driven gear 7,27 Differential shaft (3 shafts)
8, 28 Case 8a, 28a Reservoir chamber 9, 29 Reservoir tank 10, 30 Oil guide wall 110 Axle L Lubricating oil

Claims (5)

A motor shaft of an electric motor as a drive source, a counter shaft as a countershaft, and a differential shaft connected to a vehicle axle, and a fixed shaft to any of these three shafts, and the driving force of the electric motor is transmitted to the axle An axle drive device having a gear group that transmits to the inside of the case,
The motor shaft is disposed on the vehicle rear side of the differential shaft, and the gear group has a gear disposed on the counter shaft,
Stored in the case is a storage chamber for storing lubricating oil in a lower portion of the case, and the lubricating oil scraped up by a gear on the counter shaft that is only immersed in the lubricating oil in the storage chamber in the gear group. An axle drive device comprising: a reservoir tank that performs the above operation; and an oil guide wall that guides the lubricating oil in the storage chamber, which is scraped up by a gear on the countershaft, to the reservoir tank.   The lowermost end of the gear on the countershaft immersed in the lubricating oil in the storage chamber is disposed so as to be located below the lowermost end of the gear having the largest diameter in the gear group. The axle drive device according to claim 1. A helical gear having a twist angle is provided as a gear on the countershaft immersed in the lubricating oil in the storage chamber,
The oil guiding wall has a first oil guiding surface having a facing surface facing a tooth surface of a gear on the countershaft and a first oil guiding surface having a facing surface with a contour portion on a side surface of the gear on the countershaft. The axle drive device according to claim 1, further comprising a second oil guide surface extending from the surface. 4. The axle drive device according to claim 1, wherein the motor shaft, the counter shaft, and the differential shaft are arranged so that their axial directions are orthogonal to the vehicle longitudinal direction. The said reservoir tank is provided with the guide part which supplies the lubricating oil in the said reservoir tank with respect to the gear which is not meshing with the gear on the said countershaft, The 1, 2, 3, or 4 characterized by the above-mentioned. Axle drive system.

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