JP2020085219A - Vehicle drive device - Google Patents

Abstract

To provide a vehicle drive device which can guarantee lubricity of a differential gear while reducing the number of components, costs, and agitation resistance of lubrication oil in a speed reduction mechanism.SOLUTION: A vehicle drive device includes: a motor mounted on a vehicle; and a speed reduction mechanism which transmits driving force from the motor to an output gear connected to a differential part of the vehicle through a connection gear. The vehicle drive device includes: a gear housing which houses the speed reduction mechanism; a differential case which houses the differential part; a first lubrication oil supply passage which is configured to drop lubrication oil scraped by the output gear of the speed reduction mechanism to the differential case in the gear housing; a groove part formed on an outer surface of the differential case; and a second lubrication oil supply passage which has an opening in the groove part of the differential case and is configured to supply the lubrication oil dropped from the first lubrication oil supply passage to a bevel gear of the differential part.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle drive device that transmits a driving force of a motor to a differential portion of a vehicle.

For example, in a vehicle that uses a motor as a drive source, such as an electric vehicle, there is provided a vehicle drive device that includes a motor and a reduction mechanism that includes a plurality of gears and that can transmit the driving force of the motor to a differential gear that is connected to drive wheels. Are known.

International Publication No. 2014/148410

In such a vehicle drive device, it is conceivable to design the inner wall surface of the housing to be close to the gear of the reduction mechanism from the viewpoint of ensuring lubricity while suppressing an increase in stirring resistance of the lubricating oil. Here, from the viewpoint of mountability of the vehicle drive device, there is a demand for arranging a gear arrangement including a differential gear along the vehicle front-rear direction.

However, in a vehicle drive device in which the gear arrangement is arranged along the vehicle front-rear direction, the fluidity of the lubricating oil to the differential gear is reduced in the drive device due to the oil level fluctuation caused by the running state of the vehicle. The differential gear may not be sufficiently lubricated depending on the oil level fluctuation caused by the running state of the vehicle. On the other hand, increasing the amount of lubricating oil may be considered, but stirring resistance of the lubricating oil in the speed reduction mechanism increases, which may lead to deterioration of energy efficiency and increase of the temperature of the lubricating oil. In particular, in a drive device for an electric vehicle in which the speed of rotation of gears is likely to increase, the amount of heat generated may increase due to an increase in stirring resistance of the lubricating oil in the reduction mechanism. In addition, if a design is adopted in which an oil pump is provided to forcibly lubricate the lubricating oil, the number of parts and cost will increase.

The present invention has been made in view of such a situation, and an object thereof is to ensure the lubricity of a differential gear while suppressing the number of parts, cost, and stirring resistance of lubricating oil in a reduction mechanism. It is to provide a vehicle drive device capable of performing the above.

The present invention has been made to solve at least a part of the problems described above, and can be realized as the following aspects.

<First Aspect of the Present Invention>
A vehicle drive device according to a first aspect of the present invention includes a motor mounted on a vehicle and a reduction gear that transmits a driving force from the motor to an output gear connected to a differential portion of the vehicle via a connection gear. A drive device for a vehicle including a mechanism, wherein a gear housing that accommodates the reduction mechanism, a differential case that accommodates the differential portion, and the gear housing are scraped up by the output gear of the reduction mechanism. The first lubricating oil supply passage has a first lubricating oil supply passage configured to allow the lubricating oil to drip into the differential case, a groove portion formed on an outer surface of the differential case, and an opening in the groove portion of the differential case. A second lubricating oil supply passage configured to be able to supply the lubricating oil dropped from the passage to the bevel gear of the differential portion.

According to the above configuration, the vehicle drive device according to the first aspect of the present invention lubricates the differential portion even under various traveling conditions without providing a device such as an oil pump for forcibly lubricating the lubricating oil. It becomes possible to supply oil, and the lubricity of the differential portion can be ensured. Further, the vehicle drive device according to the first aspect of the present invention has a groove formed on the outer surface of the differential case, and further has an opening in the groove, so that the lubricating oil dropped from the first lubricating oil supply passage A second lubricating oil supply passage configured to be able to supply to each bevel gear of the differential portion is provided. For example, even when the differential portion is rotating at a high speed, the lubricating oil dropped from the first lubricating oil supply passage can be retained in the groove portion and retained through the second lubricating oil supply passage. Lubricating oil can be supplied to the differential section. That is, the vehicle drive device according to the aspect of the present invention efficiently supplies a large amount of lubricating oil to the differential portion as compared with a case where the lubricating oil is directly supplied from the first lubricating oil supply passage to the bevel gear. Therefore, the lubricity of the differential portion can be further improved.

<Second aspect of the present invention>
A vehicle drive device according to a second aspect of the present invention is the vehicle drive device according to the first aspect of the present invention, wherein the second lubricating oil supply passage is inside the groove formed on the outer surface of the differential case. Is formed as a communication hole from the opening to the opening provided on the inner surface of the differential case, and is formed along the tangential direction of the inner diameter of the differential case.

According to the above configuration, in the vehicle drive device according to the second aspect of the present invention, since the second lubricating oil supply passage is formed along the tangential direction of the inner diameter of the differential case, lubrication is performed as the differential case rotates. Oil can efficiently flow into the second lubricating oil supply passage.

<Third aspect of the present invention>
A vehicle drive device according to a third aspect of the present invention is the vehicle drive device according to the first or second aspect of the present invention, wherein the differential cases are arranged along a circumferential direction of the differential case. Further, it has a lubricating oil storage slit formed so as to be orthogonal to the groove portion.

According to the above configuration, in the vehicle drive device according to the third aspect of the present invention, the surface area of the outer surface of the differential case is further increased, and the lubricating oil dropped from the first lubricating oil supply passage is retained more on the outer surface of the differential case. be able to. That is, the vehicle drive device according to the third aspect of the present invention can efficiently supply a large amount of lubricating oil to the differential portion, and can further improve the lubricity of the differential portion.

<Fourth aspect of the present invention>
A vehicle drive device according to a fourth aspect of the present invention is the vehicle drive device according to any one of the first to third aspects of the present invention, wherein the differential case extends in the groove along a circumferential direction of the differential case. It has a helical lubricating oil guide slit formed.

According to the above configuration, in the vehicle drive device according to the fourth aspect of the present invention, the surface area of the outer surface of the differential case is further increased, and the lubricating oil dropped from the first lubricating oil supply passage is retained more on the outer surface of the differential case. be able to. That is, the vehicle drive device according to the fourth aspect of the present invention can efficiently supply a large amount of lubricating oil to the differential portion, and can further improve the lubricity of the differential portion. Further, since the lubricating oil guide slit is formed in the groove along the circumferential direction of the differential case, it is possible to smoothly guide the lubricating oil toward the second lubricating oil supply passage as the differential case rotates. You can

1 is a top view of a vehicle drive device according to an embodiment of the present invention. FIG. 3 is a top view showing the internal configuration of the housing in a state in which the gear housing of the vehicle drive device according to the embodiment of the present invention is vertically cut. FIG. 3 is a side view showing a relationship between a gear of the vehicle drive device according to the embodiment of the present invention and an internal space that houses the gear. 1 is a rear view of a vehicle drive device according to an embodiment of the present invention. FIG. 3 is a sectional view of the differential case taken along line α-α shown in FIG. 2. It is a top view which shows the structure inside a housing in the state which cut|disconnected the gear housing of the vehicle drive device which concerns on a 1st modification up and down. FIG. 7 is a sectional view of the differential case taken along the line β-β shown in FIG. 6. It is a top view which shows the outer surface of the differential case in a 2nd modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited to the contents described below, and can be implemented by being arbitrarily modified within the scope of the invention. In addition, the drawings used for the description of the embodiments are all schematic illustrations of constituent members, and are partially emphasized, enlarged, reduced, or omitted for better understanding. It may not be an accurate representation of scale or shape.

First, the schematic configuration of the vehicle drive device 1 will be described with reference to FIG. Here, FIG. 1 is a top view of the vehicle drive device 1 according to the present embodiment. Further, in FIG. 1, the vehicle length direction A is the front-rear direction of the vehicle in which the vehicle drive device 1 is mounted, and the vehicle width direction B is the left-right direction of the vehicle in which the vehicle drive device 1 is mounted. Is. That is, each direction shows the direction in the state where the vehicle drive device 1 is mounted on the vehicle.

In the present embodiment, the vehicle drive device 1 is a drive source that is mounted on an electric vehicle and that converts supplied electric power into motive power for traveling the vehicle. The electric vehicle is, for example, an electric commercial vehicle such as an electric truck, but is not limited to this and may be an electric passenger vehicle in which a general passenger vehicle is electrified. As shown in FIG. 1, the vehicle drive device 1 includes a motor 2, a speed reduction mechanism 3, a differential unit 4, and a housing 5 that houses these.

The motor 2 converts electric power supplied from a battery (not shown) mounted on the vehicle together with the vehicle drive device 1 into rotary motion and outputs the rotary motion. As shown in FIG. 1, the motor 2 is composed of a main body 2a and an output shaft 2b.

The deceleration mechanism 3 includes an input unit 11 connected to the output shaft 2b of the motor 2, a middle unit 12 connected to the input unit 11, and an output unit 13 located between the middle unit 12 and the differential unit 4. It is a two-stage speed reducer. In particular, the input unit 11, the middle unit 12, and the output unit 13 are connected to each other as a gear mechanism. Then, the deceleration mechanism 3 decelerates the rotational motion input from the motor 2 to the input unit 11 to a rotational speed suitable for traveling of the vehicle, and outputs it from the output unit 13. The more detailed configurations of the input unit 11, the middle unit 12, and the output unit 13 will be described later.

The differential portion 4 has a rotation shaft connected to an axle (not shown) of driving wheels of the vehicle, and absorbs a rotational motion output from the output portion 13 by, for example, a rotational speed difference at the time of turning, while driving the left and right driving wheels. To drive the drive wheel to rotate. Accordingly, the vehicle drive device 1 can drive the vehicle by causing the drive force generated by the motor 2 to rotate the drive wheels of the vehicle via the speed reduction mechanism 3 and the differential portion 4. A more detailed configuration of the differential section 4 will be described later.

The housing 5 includes a motor housing 5a that houses the motor 2, a reduction gear mechanism 3 and a gear housing 5b that houses the differential unit 4. The motor housing 5a protects and supports the motor 2 housed therein, and prevents the lubricating oil used in the motor 2 from leaking to the outside. Further, the motor housing 5a is connected to a predetermined position of the gear housing 5b so that the motor 2 and the speed reduction mechanism 3 are properly connected.

The gear housing 5b protects and supports the reduction gear mechanism 3 and the differential portion 4 housed inside, and prevents the lubricating oil used for the reduction gear mechanism 3 and the differential portion 4 from leaking to the outside. Although the reduction gear mechanism 3 and the differential portion 4 are housed in one gear housing 5b in this embodiment, they may be housed individually in two housings as long as they are connected to each other.

Next, with reference to FIG. 2 and FIG. 3, the configuration until the driving force of the motor 2 is transmitted to the differential portion 4 via the speed reduction mechanism 3 will be described in detail. Here, FIG. 2 is a top view showing an internal configuration of the housing 5 of the vehicle drive device 1 according to the embodiment of the present invention when the housing 5 is vertically cut and the upper housing is removed. FIG. 3 is a side view showing the relationship between the gears of the vehicle drive device 1 according to the embodiment of the present invention and the internal space that houses the gears. 2 and 3, the vehicle length direction A is the front-rear direction of the vehicle in which the vehicle drive device 1 is mounted, and the vehicle width direction B is the vehicle drive device 1 as in FIG. Is the left-right direction of the vehicle in which the vehicle drive device 1 is mounted, and the vehicle height direction C is the vertical direction of the vehicle in which the vehicle drive device 1 is mounted. Shows the direction at. Further, in FIG. 3, for convenience, only some of the gear teeth are shown.

As can be seen from FIGS. 2 and 3, the middle part 12 includes a connecting gear 22 that meshes with the input part 11 that is an input gear, a connecting gear 23 having a smaller diameter than the connecting gear 22, and the connecting gear 22 and the connecting gear 23. It is composed of a shaft 24 which is connected to serve as a rotation shaft. In addition, the output unit 13 includes a connecting gear 25 that meshes with the connecting gear 23, an output gear 26 having a diameter smaller than that of the connecting gear 25, and a shaft 27 that connects the connecting gear 25 and the output gear 26 and serves as a rotating shaft. Has been done. With such a configuration of the speed reduction mechanism 3, the rotation speed of the motor 2 is reduced in two stages and transmitted to the differential unit 4.

2 and 3, the differential unit 4 has a final gear 31 that meshes with the output gear 26, and a differential case 32 that is integrally provided on the surface of the final gear 31. The differential case 32 is supported by the gear housing 5b by a bearing (not shown) or the like. That is, the differential case 32 can rotate together with the rotating parts of the differential unit 4 including the final gear 31. The differential unit 4 also includes a right diff side gear 33, a left diff side gear 34, and two diff pinion gears 35 and 36 housed inside the diff case 32. Here, the right diff side gear 33, the left diff side gear 34, and the diff pinion gears 35 and 36 are general bevel gears. The differential unit 4 constitutes a general differential gear by these members.

As can be seen from FIGS. 2 and 3, in the vehicle drive device 1 according to the present embodiment, the respective gears forming the speed reduction mechanism 3 and the differential portion 4 are arranged along the vehicle length direction A. Therefore, the mountability of the vehicle drive device 1 on the electric vehicle is improved. That is, the vehicle drive device 1 according to the present embodiment can be easily mounted on a general electric truck and can be used for various types of vehicles.

Further, as shown in FIG. 3, the inner wall surface 5c of the housing 5 is close to the gears forming the speed reduction mechanism 3 and the differential portion 4 in the vehicle height direction C. Therefore, each gear is likely to be immersed in the lubricating oil even if the amount of the lubricating oil that fills most of the gear housing 5b is not filled, and the increase in stirring resistance of the lubricating oil is suppressed. Therefore, the lubricity for each gear is guaranteed.

Next, the supply of lubricating oil to each gear will be described with reference to FIGS. 2 to 5. Here, FIG. 4 is a rear view of the vehicle drive device 1 according to the embodiment of the present invention, and shows a part of the reduction gear mechanism 3 and the differential portion 4 in a visualized manner. FIG. 5 is a sectional view of the differential case 32 taken along the line α-α shown in FIG. 4 and 5, the vehicle length direction A is the front-rear direction of the vehicle on which the vehicle drive device 1 is mounted, and the vehicle height direction C is the vehicle height direction C as in FIGS. 1 to 3. It is the vertical direction of the vehicle in which the drive device 1 is mounted, and each direction indicates the direction in which the vehicle drive device 1 is mounted in the vehicle.

As shown in FIG. 3, the lubricating oil exists in the internal space of the housing 5 so as to immerse a part of each of the connecting gear 22, the connecting gear 25, and the final gear 31. That is, the oil surface 40 of the lubricating oil is located higher than the lower end surfaces of the connecting gear 22, the connecting gear 25, and the final gear 31. Therefore, the rotation of the connecting gear 22, the connecting gear 25, and the final gear 31 ensures the lubricity of each tooth of the connecting gear 22, the connecting gear 25, and the final gear 31. On the other hand, the input section 11, the coupling gear 23, and the output gear 26, which are the input gears, are engaged with the coupling gear 22, the coupling gear 25, and the final gear 31 which are immersed in the lubricating oil, although they are not immersed in the lubricating oil. Therefore, the lubricating oil is supplied via the connecting gear 22, the connecting gear 25, and the final gear 31. This ensures the lubricity of each tooth of the input section 11, the coupling gear 23, and the output gear 26. Lubricating oil is supplied to each bevel gear housed in the differential case 32 via the second lubricating oil supply passage 42 provided in the differential case 32.

As can be seen from FIGS. 2 and 4, the gear housing 5b is provided with a first lubricating oil supply passage 41 extending from above the connecting gear 25 toward the differential portion 4. More specifically, the first lubricating oil supply passage 41 extends from the opening (introduction port) provided in the wall of the gear housing 5b located behind the top of the coupling gear 25 to the right center end of the differential portion 4. It is formed as a communication hole reaching an opening (a discharge port) provided in the wall of the gear housing 5b located above the portion. In particular, the opening serving as the discharge port of the first lubricating oil supply passage 41 is located immediately above the differential case 32.

Further, as can be seen from FIG. 3, the first lubricating oil supply passage 41 extends along the contact surface of the virtual circle (circumferential portion of the connecting gear 25) formed by the gear tooth end faces when the connecting gear 25 rotates. Are provided. That is, on the side surface of the vehicle drive device 1, the introduction port of the first lubricating oil supply passage 41 is provided in proximity to a point on the outer edge of the connecting gear 25 so as to contact the point on the outer edge. ..

By providing the first lubricating oil supply passage 41 as described above, the lubricating oil around the coupling gear 25 is scraped up along the circumference of the coupling gear 25 as shown by an arrow D in FIG. As shown by the arrow E in FIGS. 3 and 4, the differential lubricant reaches the differential case 32 of the differential section 4 via the first lubricating oil supply passage 41. In other words, the lubricating oil scraped up by the connecting gear 25 is transmitted through the wall of the gear housing 5b and supplied to the differential case 32.

Here, as can be seen from FIGS. 2, 4, and 5, a groove portion 37 is formed on the outer surface of the differential case 32 along the circumferential direction of the differential case 32. The groove portion 37 is provided, for example, on the outer surface of the differential case 32 at a position capable of receiving the lubricating oil dropped from the first lubricating oil supply passage 41. The groove portion 37 has, for example, a flat concave shape at the bottom portion of the groove portion 37, a substantially U-shaped curved bottom portion portion, or a tapered shape in which the bottom portion is gradually tapered toward the bottom portion. In FIG. 4, as an example, a groove portion 37 having a concave shape is shown. By forming the groove portion 37 on the outer surface of the differential case 32, the lubricating oil dropped from the first lubricating oil supply passage 41 can be easily retained on the outer surface.

Further, the differential case 32 has the opening portion 38 in the groove portion 37, and is configured to be capable of supplying the lubricating oil dropped from the first lubricating oil supply passage 41 to each bevel gear of the differential portion 4 An oil supply passage 42 is provided. As can be seen from FIGS. 4 and 5, the second lubricating oil supply passage 42 is formed from an opening (inlet) provided inside the groove 37 formed on the outer surface of the differential case 32 (for example, the bottom of the groove 37). , And is formed as a communication hole reaching an opening (exhaust port) provided on the inner surface of the differential case 32. The second lubricating oil supply passage 42 supplies the lubricating oil retained in the groove portion 37 to the right differential side gear 33 of the differential portion 4 housed inside the differential case 32. Further, the second lubricating oil supply passage 42 is formed in consideration of the rotation of the differential case 32 so that the lubricating oil easily flows in. For example, as shown in FIG. 5, the second lubricating oil supply passage 42 is formed along the tangential direction of the inner diameter of the differential case 32. Since the second lubricating oil supply passage 42 is formed along the tangential direction of the inner diameter of the differential case 32, the lubricating oil can efficiently flow into the second lubricating oil supply passage 42 as the differential case 32 rotates.

By providing such a second lubricating oil supply passage 42, the lubricating oil dropped from the first lubricating oil supply passage 41 passes through the second lubricating oil supply passage 42 as shown by an arrow E in FIG. Then, the right differential side gear 33 of the differential portion 4 is reached. In other words, the lubricating oil dropped from the first lubricating oil supply passage 41 is transmitted through the wall of the differential case 32 and is supplied to the right differential side gear 33 that is a bevel gear. That is, the bevel gears housed in the differential case 32 are supplied with the lubricating oil via the second lubricating oil supply passage 42.

Then, the lubricating oil supplied to the right diff side gear 33 is transmitted from the right diff side gear 33 into the diff case 32, and is also supplied to the left diff side gear 34 and the diff pinion gears 35 and 36 which are other bevel gears. Therefore, the lubricating oil can be satisfactorily supplied to each bevel gear in the differential case 32 that is not immersed in the lubricating oil, and the lubricity of the differential portion 4 can be improved. In particular, when the electric vehicle travels on a route having a predetermined slope such as a downhill or an uphill, even if the lubricating oil is biased toward the reduction mechanism 3, the connecting gear 25 rotates and the lubricating oil By scooping up the oil, it becomes possible to supply the lubricating oil to the differential portion 4.

As described above, the vehicle drive device 1 according to the present embodiment supplies the lubricating oil to the differential portion 4 even in various traveling situations without providing a device such as an oil pump for forcibly lubricating the lubricating oil. Therefore, the lubricity of the differential portion 4 can be ensured. Further, since the inner wall surface 5c of the housing 5 is close to the gears of the reduction gear mechanism 3 and the differential portion 4, the stirring resistance of the lubricating oil in the reduction gear mechanism is suppressed. Further, the vehicle drive device 1 according to the present embodiment is a drive device for an electric vehicle in which the speed of rotation of gears is easily increased by suppressing the agitation resistance of the lubricating oil. The amount of heat generated due to the increase can be suppressed.

Further, in the present embodiment, since the first lubricating oil supply passage 41 is provided along the tangent surface of the virtual circle formed by the gear tooth end surfaces when the connecting gear 25 rotates, Using the rotation, the scraped-up lubricating oil can be introduced toward the introduction port of the first lubricating oil supply passage 41. Specifically, since it is not necessary to forcibly lubricate the differential section 4 using a lubricating oil supply pump or the like, the lubricity of the differential section 4 can be improved without increasing the energy load.

Further, the vehicle drive device 1 according to the present embodiment has the groove portion 37 formed on the outer surface of the differential case 32, and further has the opening portion 38 in the groove portion 37, and the lubrication dripped from the first lubricating oil supply passage 41. A second lubricating oil supply passage 42 is provided so that oil can be supplied to each bevel gear of the differential section 4. For example, even when the differential portion 4 is rotating at a high speed, the lubricating oil dropped from the first lubricating oil supply passage 41 can be retained in the groove portion 37, and the second lubricating oil supply passage 42 can be closed. The lubricating oil retained via the above can be supplied to the differential section 4. That is, the vehicle drive device 1 according to the present embodiment differentially supplies a larger amount of lubricating oil as compared with the case where the lubricating oil is directly supplied from the first lubricating oil supply passage 41 to the right differential side gear 33 that is a bevel gear. It is possible to efficiently supply the differential portion 4, and the lubricity of the differential portion 4 can be further improved.

(First modification)
FIG. 6 is a top view showing an internal configuration of the housing in a state in which the gear housing 5b of the vehicle drive device 1 according to the first modification is vertically cut. FIG. 7 is a sectional view of the differential case 32 taken along the line β-β shown in FIG. 6 and 7, the vehicle length direction A is the front-rear direction of the vehicle in which the vehicle drive device 1 is mounted and the vehicle height direction C is the same as in FIGS. 1 to 5 above. It is the vertical direction of the vehicle in which the vehicle drive device 1 is installed, and each direction indicates the direction in which the vehicle drive device 1 is installed in the vehicle.

As shown in FIGS. 6 and 7, in the vehicle drive device 1 according to the first modification, the differential cases 32 are arranged along the circumferential direction of the differential case 32 and are provided so as to be orthogonal to the groove portions 37. It has a lubricating oil storage slit 39. As a result, the surface area of the outer surface of the differential case 32 is further increased, and more of the lubricating oil dropped from the first lubricating oil supply passage 41 can be retained on the outer surface of the differential case 32. That is, the vehicle drive device 1 according to the first modification can efficiently supply a large amount of lubricating oil to the differential portion 4, and the lubricity of the differential portion 4 can be further improved.

(Second modified example)
FIG. 8 is a top view showing the outer surface of the differential case 32 in the second modification. In FIG. 8, as in FIGS. 1 to 7, the vehicle length direction A is the front-rear direction of the vehicle in which the vehicle drive device 1 is mounted, and the vehicle width direction B is the vehicle drive device 1. Is the left-right direction of the vehicle in which the vehicle drive device 1 is mounted, and the vehicle height direction C is the vertical direction of the vehicle in which the vehicle drive device 1 is mounted. In each direction, the vehicle drive device 1 is mounted in the vehicle. Shows the direction at.

As shown in FIG. 8, in the vehicle drive device 1 according to the second modified example, in addition to the vehicle drive device 1 described in the embodiment and the first modified example, a helical lubricating oil is provided in the groove portion 37. The guide slit 43 may be formed. The lubricating oil guide slit 43 is formed in a spiral shape in the groove 37 along the circumferential direction of the differential case 32. As a result, the surface area of the outer surface of the differential case 32 is further increased, the lubricating oil dropped from the first lubricating oil supply passage 41 can be retained more on the outer surface of the differential case 32, and the dropped lubricating oil can be efficiently supplied. It can be introduced into the opening 38. That is, the vehicle drive device 1 according to the second modification can efficiently supply a large amount of lubricating oil to the differential portion 4, and the lubricity of the differential portion 4 can be further improved. Further, since the lubricating oil guide slit 43 is formed in the groove portion 37 along the circumferential direction of the differential case 32, the vehicle drive device 1 according to the second modified example lubricates as the differential case 32 rotates. The oil can be smoothly guided toward the second lubricating oil supply passage 42.

1 Vehicle Driving Device 2 Motor 2a Main Body 2b Output Shaft 3 Reduction Mechanism 4 Differential Part 5 Housing 5a Motor Housing 5b Gear Housing 5c Inner Wall Surface 11 Input Part (Input Gear)
12 Middle part 13 Output part 22, 23, 25 Connection gear 24, 27 Shaft 26 Output gear 31 Final gear 32 Differential case 33 Right differential side gear (bevel gear)
34 Left differential side gear (bevel gear)
35, 36 differential pinion gear (bevel gear)
37 Groove 38 Opening 39 Lubricating Oil Storage Slit 40 Oil Surface 41 First Lubricating Oil Supply Path 42 Second Lubricating Oil Supply Path 43 Lubricating Oil Induction Slit A Vehicle Length Direction B Vehicle Width Direction C Vehicle Height Direction

Claims (4)

A vehicle drive device comprising: a motor mounted on a vehicle; and a speed reduction mechanism that transmits a driving force from the motor to an output gear connected to a differential portion of the vehicle via a connection gear,
A gear housing that houses the reduction mechanism,
A differential case accommodating the differential portion,
In the gear housing, a first lubricating oil supply path configured to allow the lubricating oil scraped up by the output gear of the speed reduction mechanism to drip into the differential case,
A groove formed on the outer surface of the differential case,
A second lubricating oil supply path having an opening in the groove of the differential case and configured to be able to supply the lubricating oil dropped from the first lubricating oil supply path to the bevel gear of the differential section;
A drive device for a vehicle including the. The second lubricating oil supply passage is formed as a communication hole extending from an opening in the groove formed on the outer surface of the differential case to an opening provided on the inner surface of the differential case, and in the tangential direction of the inner diameter of the differential case. The vehicle drive device according to claim 1, wherein the drive device is formed along the same. The vehicle drive device according to claim 1, wherein the differential case has a lubricating oil storage slit that is arranged along a circumferential direction of the differential case and is formed so as to be orthogonal to the groove portion. The vehicle drive device according to any one of claims 1 to 3, wherein the differential case has a helical lubricating oil guide slit formed in the groove along the circumferential direction of the differential case.

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