JP2017129205A - Vehicle drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle drive unit which can precisely supply a lubricant to a lubrication-necessary region without increasing a manufacturing cost.SOLUTION: A vehicle drive unit A comprises electric motors 1L and 1R, parallel shaft gear reduction gears 2L and 2R for decelerating the power of the electric motors and transmitting it, and a lubricant sump at a bottom of a reduction gear housing 20 which accommodates the reduction gears. The vehicle drive unit performs the lubrication and cooling of a gear 25a by scooping up the lubricant in the lubricant sump by the gear. The reduction gear housing includes an oil feed plate which is divided into a plurality of pieces in an axial direction of a gear shaft 25, formed of a different member different from that of the reduction gear housing, and guides the splashed lubricant to the gear. The oil feed plate is gripped and fixed by the reduction gear housing.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle drive apparatus including an electric motor and a speed reducer that decelerates the power of the electric motor and transmits it to a drive wheel. Lubricating oil enclosed in a housing that houses the speed reducer is oil bathed. The present invention relates to a vehicle drive device that supplies gears and bearings with a lubrication method.

  Patent Document 1 discloses a vehicle drive device that includes two electric motors and a speed reducer that independently drive left and right drive wheels.

  Since this type of vehicle drive device includes an electric motor for driving independently for each of the left and right drive wheels, a single motor drive device that drives the left and right drive wheels with a single common electric motor is provided. This has the advantage that a differential gear or the like that distributes the driving force of the two electric motors to the left and right is unnecessary.

  As shown in FIG. 12, a conventional vehicle drive device including two conventional electric motors and a speed reducer disclosed in Patent Document 1 and left and right electric motors 101L and 101R for individually driving left and right drive wheels are electrically driven. Reducers 102L and 102R that decelerate the rotation of the motors 101L and 101R are provided, and the reducers 102L and 102R are arranged at the center of the left and right electric motors 101L and 101R.

  As shown in FIG. 12, the reduction gears 102 </ b> L and 102 </ b> R are driven wheels via an input gear shaft 123 having an input gear to which power is transmitted from the motor shaft 112, and a drive shaft including a constant velocity joint 126 and an intermediate shaft 127. And an output gear shaft 125 that transmits a driving force to the input gear shaft 123, and the input gear shaft 123 and the output gear shaft 125 are arranged in parallel and offset from each other.

  One or more intermediate gear shafts 124 (counter shafts) are provided between the input gear shaft 123 and the output gear shaft 125 of the speed reducers 102L and 102R.

  The left and right reduction gears 102L and 102R are accommodated in parallel in a single reduction gear housing 128.

  A predetermined amount of lubricating oil is enclosed in the reduction gear housing 128 to lubricate the gear trains constituting the left and right reduction gears 102L and 102R, and the tooth surfaces of the gears and rolling bearings are obtained by an oil bath lubrication system. Lubricating oil is supplied to

  In the oil bath lubrication system, the lubricating oil accumulated at the bottom is scraped up by the rotational operation of the gears, and the oil droplets generated at that time are supplied to the tooth surfaces of the gears of the reduction gear and the rolling bearings. In this oil bath lubrication system, lubrication and cooling of the gears are problems. In particular, it is important how to supply the lubricating oil to the small gear which is not oil bathed.

  Patent Document 2 discloses an automatic transmission configured to drop lubricating oil onto a portion requiring lubrication. In the device described in Patent Document 2, a rib for dropping the lubricating oil on a portion requiring lubrication is formed inside the housing, and the lubricating oil splashed on the rib is guided by the inclination of the rib and needs to be lubricated. Supply to the site.

Japanese Patent Laid-Open No. 11-243664 JP 2008-14406 A

  However, when the housing is manufactured by casting, it is necessary to remove the housing from the mold, and it is difficult to manufacture a complicated shape. In addition, it is difficult to form a rib having a complicated shape integrally with the housing when it is formed by cutting. For this reason, the rib has to have a simple shape, and it has been difficult to supply the lubricating oil to a desired portion.

  Accordingly, an object of the present invention is to provide a vehicle drive device that can supply lubricating oil to a portion requiring lubrication without increasing the manufacturing cost.

  In order to solve the above-described problems, the present invention includes an electric motor and a speed reducer that decelerates the power of the electric motor and transmits the power to the drive wheels. The speed reducer receives power from a motor shaft. One or more intermediate gears having an input gear shaft having an input gear, an output gear shaft having an output gear for transmitting a driving force to a drive wheel, and an intermediate gear provided between the input gear shaft and the output gear shaft In a vehicle drive device that has a shaft and a lubricating oil reservoir is provided at the bottom of the reduction gear housing that houses the reduction gear, and the lubricating oil in the lubricating oil reservoir is scraped up by a gear to lubricate and cool the gear. The reduction gear housing is divided into a plurality in the axial direction of the gear shaft, and is provided with an oil supply plate that is formed as a separate member with respect to the reduction gear housing and guides the splashed lubricating oil to the gear, and the oil supply plate is divided. Reducer howjin It is sandwiched in the fixing.

  Moreover, it is good to provide the fitting part which consists of a rectangular-shaped recessed part in the said divided | segmented housing, and to provide the rectangular-shaped insertion part inserted in the said fitting part in the said oil supply board.

  Further, the oil supply plate has a wall portion that is tapered toward the meshing portion of the gear, and an edge portion that guides the lubricating oil to the tip of the wall portion provided at the end portion of the wall portion. The oil supply plate may be fixed to the speed reducer housing so as to be positioned above the meshing portion of the gear.

  Further, each gear shaft is supported via a rolling bearing fitted in a bearing fitting hole provided in the reduction gear housing, and a guide portion for guiding lubricating oil to the rolling bearing is further provided on the oil supply plate. The guide portion has a guide wall portion that is tapered toward the rolling bearing, and an edge portion that guides the lubricating oil to the tip of the guide wall portion provided at the end portion of the guide wall portion. Can be configured.

  And two electric motors for independently driving the left and right drive wheels, and two reduction gears for individually decelerating the power of the two electric motors and transmitting them to the left and right drive wheels, The reduction gear housing that houses the two reduction gears in parallel in the left and right side, with the reduction gear housing that accommodates the two reduction gears in the left and right parallel, and the motor housings of the two electric motors fixedly arranged on the left and right sides thereof. Is composed of a central housing part and three pieces of a left side housing part and a right side housing part fixed so as to close the left and right openings of the central housing part, and the oil supply plate penetrates the central housing part. A through hole is provided, and the oil supply plate is passed through the through portion, and the oil supply plate is sandwiched and fixed between the left side housing portion and the right side housing portion. .

  As described above, according to the present invention, the oil supply plate formed by a separate member from the speed reducer housing is sandwiched and fixed by the divided speed reducer housing, so that the oil supply plate is guided to a place where lubricating oil is required. The lubricating oil that is scraped up by the gear and splashed on the guide plate can be efficiently guided to the gear.

  Further, by providing a fitting portion made of a rectangular recess in the divided housing, and providing a rectangular insertion portion to be inserted into the fitting portion in the oil supply plate, the oil supply plate is sandwiched and fixed in the housing, The oil supply plate can be fixed at a predetermined angle without rotating.

1 is a cross-sectional plan view showing a first embodiment of a vehicle drive device to which the present invention is applied. 1 is a schematic plan view showing an example of an electric vehicle using a vehicle drive device according to the present invention. FIG. 2 is an enlarged cross-sectional plan view of the speed reducer portion of FIG. 1. It is explanatory drawing made into the cross section by the IV-IV line of FIG. It is sectional explanatory drawing containing the oiling board part of the vehicle drive device to which this invention is applied. It is explanatory drawing which shows the reduction gear housing part used for 1st Embodiment of this invention, and has shown the right side housing of the state which removed the oiling board. It is a perspective view which shows the 1st example of the oiling board used for this invention. It is a perspective view which shows the 2nd example of the oiling board used for this invention. It is a cross-sectional top view which shows 2nd Embodiment of the vehicle drive device to which this invention is applied. It is explanatory drawing of the state which showed the reduction gear housing part used for 2nd Embodiment of this invention, and looked at the center housing side from the left side housing side. It is a perspective view which shows the oil supply board used for 2nd Embodiment of this invention. It is a cross-sectional top view which shows the conventional 2 motor type vehicle drive device.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The two-motor type vehicle drive device A according to the first embodiment shown in FIG. 1 has a reduction gear housing 20 that houses two reduction gears 2L and 2R in parallel in the left and right directions. The motor housings 3L and 3R of the two electric motors 1L and 1R are fixedly arranged.

  The electric vehicle C shown in FIG. 2 is a front-wheel drive system, and is a two-motor vehicle drive device A that independently drives a chassis 71, front wheels 72 as drive wheels, rear wheels 73, and left and right drive wheels. The two-motor type vehicle drive device A is mounted on the chassis 71 at the center position of the left and right front wheels 72 that are drive wheels, and the driving force of the two-motor type vehicle drive device A is equal to the constant velocity joint 15. And transmitted through the intermediate shaft 16 to the front wheels 72 which are left and right drive wheels.

  As a mounting form of the two-motor type vehicle driving device A, a rear wheel driving method or a four wheel driving method may be used in addition to the front wheel driving method shown in FIG.

  The left and right electric motors 1L, 1R in the two-motor type vehicle drive device A are housed in motor housings 3L, 3R as shown in FIG.

  The motor housings 3L and 3R include cylindrical motor housing bodies 3aL and 3aR, outer walls 3bL and 3bR that close the outer surfaces of the motor housing bodies 3aL and 3aR, and reduction gears on the inner surfaces of the motor housing bodies 3aL and 3aR. It consists of inner walls 3cL and 3cR separated from 2L and 2R. The inner walls 3cL and 3cR of the motor housing bodies 3aL and 3aR are provided with openings through which the motor shaft 12a is drawn.

  As shown in FIG. 1, the electric motors 1 </ b> L and 1 </ b> R are of a radial gap type in which a stator 11 is provided on the inner peripheral surface of the motor housing body 3 aL and 3 aR, and a rotor 12 is provided at an interval on the inner periphery of the stator 11. I am using something. The electric motors 1L and 1R may be axial gap types.

  The rotor 12 has a motor shaft 12a in the center, and the motor shaft 12a is drawn from the openings of the inner walls 3cL and 3cR of the motor housing bodies 3aL and 3aR to the speed reducers 2L and 2R, respectively. A seal member 13 is provided between the openings of the motor housing main bodies 3aL and 3aR and the motor shaft 12a.

  The motor shaft 12a is rotatably supported by the rolling bearings 14a and 14b on the inner walls 3cL and 3cR and the outer walls 3bL and 3bR of the motor housing main bodies 3aL and 3aR (FIG. 1).

  As shown in FIGS. 1 and 3, the speed reducer housing 20 that accommodates the two speed reducers 2L and 2R provided in parallel in the left and right blocks the central housing portion 20a and the opening on the left side of the central housing portion 20a. The left side housing part 20bL is fixed to the right side housing part 20bR and the right side housing part 20bR is fixed to close the right side opening part of the central housing part 20a. The reduction gear housing 20 is divided into three pieces in the axial direction of the gear shaft of the reduction gear. That is, the reduction housing 20 is divided into three pieces perpendicular to the gear shaft of the reduction gear. The left side housing portion 20bL and the right side housing 20bR are fixed by a plurality of bolts (not shown) so as to close the openings on both sides of the central housing portion 20a.

  The left side housing portion 20bL and the right side housing portion 20bR of the reduction gear housing 20 are provided with a plurality of side surfaces on the outboard side (outside of the vehicle body) and inner side walls 3cL and 3cR of the motor housing bodies 3aL and 3aR of the electric motors 1L and 1R. By fixing with the bolts 29, the two electric motors 1L and 1R are fixedly arranged on the left and right sides of the reduction gear housing 20 (FIG. 1).

  As shown in FIG. 1, the central housing portion 20a is provided with a partition wall 21 at the center. The speed reducer housing 20 is divided into left and right parts by the partition wall 21, and independent left and right accommodation chambers for accommodating the two speed reducers 2 </ b> L and 2 </ b> R are provided in parallel.

  As shown in FIGS. 1 and 3, the speed reducers 2L and 2R are provided symmetrically, and mesh with the input gear shaft 23 having the input gear shaft 23a having the input gear 23a to which power is transmitted from the motor shaft 12a. An intermediate gear shaft 24 having a small-diameter gear 24b meshing with the large-diameter gear 24a and the output gear 25a, and an output gear 25a, which is pulled out from the speed reducer housing 20 through the constant velocity joint 15 and the intermediate shaft 16 (FIG. 2). And a parallel shaft gear reducer provided with an output gear shaft 25 for transmitting a driving force to the drive wheels. The input gear shaft 23, the intermediate gear shaft 24, and the output gear shaft 25 of the left and right reduction gears 2L and 2R are coaxially arranged.

  Both ends of the input gear shaft 23 of the speed reducers 2L and 2R are rolling bearings in bearing fitting holes 27a formed on both left and right sides of the partition wall 21 of the central housing portion 20a and bearing fitting holes 27b formed in the side housings 20bL and 20bR. It is rotatably supported via 28a and 28b. The bottoms of the bearing fitting holes 27a and 27b are stepped and are formed with a thinner thickness on the inner peripheral side than the wall part with which the outer rings of the rolling bearings 28a and 28b abut.

  Outboard end portions of the input gear shaft 23 are drawn outward from openings 27c provided in the left side housing portion 20bL and the right side housing portion 20bR, respectively. An oil seal 31 is provided between the two parts to prevent leakage of lubricating oil sealed in the speed reducers 2L and 2R and intrusion of muddy water from the outside.

  The input gear shaft 23 has a hollow structure, and the motor shaft 12 a is inserted into the hollow input gear shaft 23. The input gear shaft 23 and the motor shaft 12a are coupled to each other by spline (including the serration).

  The intermediate gear shaft 24 is a stepped gear shaft having a large diameter gear 24a meshing with the input gear 23a and a small diameter gear 24b meshing with the output gear 25a on the outer peripheral surface. Both ends of the intermediate gear shaft 24 are formed into bearing fitting holes 32a formed on both surfaces of the partition wall 21 of the central housing portion 20a, bearing fitting holes 32b formed on the left side housing portion 20bL, and the right side housing portion 20bR, respectively. It is supported via rolling bearings 34a and 34b. And the bottom part of the bearing fitting holes 32a and 32b is formed in a stepped shape with a thinner thickness on the inner peripheral side than the wall part with which the outer ring of the rolling bearings 34a and 34b abuts.

  The output gear shaft 25 has a large-diameter output gear 25a, and is formed in a bearing fitting hole 35a formed on both surfaces of the partition wall 21 of the central housing portion 20a, the left side housing portion 20bL, and the right side housing portion 20bR. The bearing fitting hole 35b is supported by rolling bearings 37a and 37b. And the bottom part of the bearing fitting holes 35a and 35b is formed in a stepped shape in which the inner peripheral side is thinner than the wall part with which the outer ring of the rolling bearings 37a and 37b abuts.

  The end of the output gear shaft 25 on the outboard side is pulled out of the reduction gear housing 20 through an opening 35c formed in the left side housing portion 20bL and the right side housing portion 20bR, and the output gear shaft 25 is pulled out. The outer joint portion 15a of the constant velocity joint 15 is splined to the outer peripheral surface of the board side end.

  The constant velocity joint 15 coupled to the output gear shaft 25 is connected to the drive wheel 72 via the intermediate shaft 16 (FIG. 2).

  An oil seal 39 is provided between the end of the output gear shaft 25 on the outboard side and the openings 35c formed in the left side housing 20bL and the right side housing part 20bR, respectively, and sealed in the speed reducers 2L and 2R. Prevents leakage of lubricating oil and intrusion of mud from outside.

  In the oil bath lubrication method, a lubricating oil reservoir 20e is provided at the bottom of the speed reducer housing 20, and the speed reducer housing 20 is lubricated so that the oil level is high enough to immerse a part of the large diameter gear 24a and the output gear 25a. Oil is enclosed. Lubricating oil in the lubricating oil reservoir 20e is scraped up by the gears, and oil droplets generated at that time are supplied to the tooth surfaces of the gears of the reduction gear and the rolling bearings. The lubricating oil supplied to the tooth surfaces of the gears of the reduction gears lubricates and cools the gears.

  In the first embodiment, as shown in FIGS. 4 and 5, the reduction gear housing 20 includes a central housing portion 20a, a left side housing portion 20bL, and a right side housing portion 20bR that constitute the reduction gear housing 20. Is attached with an oil supply plate 40 formed of a separate member. As will be described later, the oil supply plate 40 is formed so that the lubricating oil efficiently guides to the meshing portion of the small-diameter gear 24b provided on the intermediate gear shaft 24, and is decelerated so as to be positioned above the meshing portion of the gear. It is fixed to the machine housing 20. In other words, the lubricating oil that has been splashed and sprinkled by the lubricating oil in the lubricating oil reservoir 20e is efficiently guided by the oil supply plate 40 to the meshing portion between the small diameter gear 24b and the output gear 25a. Although the small-diameter gear 24b is not an oil bath, the lubricating oil splashed on the oil supply plate 40 can be efficiently supplied to the small-diameter gear 24b.

  4 to 6, the right speed reducer 2 </ b> R has been described. Similarly, the left speed reducer 2 </ b> L includes a central housing portion 20 a that forms the speed reducer housing 20 and a left side surface. An oil supply plate 40 formed of a separate member from the housing part 20bL and the right side housing part 20bR is attached.

As a method of manufacturing the oil supply plate 40 using a separate member and fixing it to the speed reducer housing 20, there are screwing, welding, adhesion, and the like. However, there are the following problems with screwing, welding, and adhesion. With screwing, there is a risk that the screw or the oil supply plate may be removed due to vibration and may be bitten by the gear. In addition, the number of screws is tightened, resulting in poor assembly.
In the case of welding, the peripheral part may be deformed by the influence of heat during welding. There is a need for a space for inserting an instrument during welding, which may increase the size of the reducer housing.

  In the case of adhesion, there is a possibility that the oil supply plate may come off and be engaged with the gear due to deterioration of the adhesive. Moreover, the difficulty that degradability is bad also arises. Therefore, in this embodiment, the fuel supply plate 40 is sandwiched and fixed between the central housing portion 20a, the left side housing portion 20bL, and the right side housing portion 20bR.

  FIG. 6 shows the right side housing 2bR with the fuel supply plate 40 removed. As shown in FIGS. 5 and 6, a fitting portion 20c made of a rectangular recess is provided on the inner wall surface of the central housing portion 20a and the inner wall surface of the right side housing 2bR. Similarly, the left side housing 2bL is provided with a fitting portion 20c formed of a rectangular recess.

  As shown in FIG. 7, the first oil supply plate 40 of this embodiment is formed in a tapered shape toward the meshing portion of the gear, that is, a triangular wall portion 40a is formed. At both ends of the triangular wall portion 40a, there are provided rectangular insertion portions 41 to be inserted into the fitting portions 20c provided in the central housing portion 20a, the left side housing portion 20bL, and the right side housing portion 20bR. And the edge part 42 is provided in the right-and-left end part of the wall part 40a of the oil supply board 40, and the opening part 43 for dripping the lubricating oil which flows is provided in the front-end | tip of the wall part 40a.

  The above-described oil supply plate 40 is formed as a separate member from the central housing portion 20a, the left side housing portion 20bL, and the right side housing portion 20bR that constitute the reduction gear housing 20, and therefore, by press working, machining, or the like. The shape in which the lubricating oil is dripped at a desired position can be easily manufactured.

  The oil supply plate 40 has a central housing portion 20a, a left side surface so that the wall portion 40a faces in a direction to receive the lubricating oil scraped up by the output gear 25a that rotates in the direction indicated by the arrow in FIG. By inserting the insertion part 41 into the fitting part 20c provided in the housing part 20bL and the right side housing part 20bR and assembling the reduction gear housing 20, the central housing part is provided between the central housing part 20a and the left side housing part 20bL. Oil supply plates 40 are sandwiched and fixed between 20a and the right side housing portion 20bR. As the member of the oil supply plate 40, a member having a linear expansion coefficient equivalent to the members of the central housing part 20a, the left side housing part 20bL, and the right side housing part 20bR constituting the reduction gear housing 20 is used. When the speed reducer housing 20 is thermally expanded or contracted due to a temperature change, the oil supply plate 40 is also thermally expanded or contracted to ensure a fixed fit between the fitting portion 20 c and the insertion portion 41.

  Since the fitting portion 20c and the insertion portion 41 are each formed in a rectangular shape, the oil supply plate 40 is disposed between the central housing portion 20a and the left side housing portion 20bL, and between the central housing portion 20a and the right side housing portion 20bR. When each is sandwiched and fixed, the oil supply plate 40 is fixed at a predetermined angle without rotating.

  When the oil supply plate 40 of the first example is sandwiched and fixed between the central housing portion 20a and the left side housing portion 20bL and between the central housing portion 20a and the right side housing portion 20bR, the lubricating oil in the lubricating oil reservoir 20e is retained. The lubricating oil scraped up by the gear is splashed on the oil supply plate 40, the lubricating oil flows down along the wall portion 40 a of the oil supply plate 40, is collected at the opening portion 43 at the edge portion 42, and the small-diameter gear from the opening portion 43. Lubricating oil will be dripped at the meshing part of 24b and the output gearwheel 25a. Thus, since the lubricating oil is efficiently supplied to the small-diameter gear 24b that is not oil bathed, the gear can be lubricated and cooled.

  Next, a second example of the oil supply plate 40 used in the present invention will be described with reference to FIG. As shown in FIG. 8, the oil supply plate 40 is provided with a wall 40a at a portion for guiding the lubricating oil to the small gear 24b, and the lubricating oil is guided to the rolling bearings 34a and 34b that support the intermediate gear shaft 24 on both sides thereof. A guide part 44 is provided. That is, as shown in FIG. 8, wall portions 40a and 44a made of three triangles are provided. Edge portions 42 are provided at both ends of the central wall portion 40a, and an opening portion 43 is provided at the tip of the edge portion 42 for dripping the lubricating oil into the small diameter gear 24b. The guide portions 44 provided on both sides of the central wall portion 40a include a guide wall portion 44a formed in a tapered shape toward the rolling bearing and a distal end of the guide wall portion 44a provided at the end portion of the guide wall portion 44a. In addition, an edge 45 for guiding the lubricating oil and an opening 46 for dropping the lubricating oil to the rolling bearings 34a and 34b are provided. The guide wall 44a is provided with an edge 45 at one end and no edge at the other. However, when the oil supply plate 40 is fitted into the fitting 20c of the housing 20, the end becomes a reduction gear. Lubricating oil is guided to the rolling bearings 34a and 34b by the inner wall portion of the reduction gear housing 20 and the edge portion 45 in contact with the inner wall portion of the housing 20.

  When the oil supply plate 40 of the second example is sandwiched and fixed to the reducer housing 20, the lubricant oil that has been scraped up by the gears in the lubricant reservoir 20e is splashed onto the oil supply plate 40, and the oil supply plate 40 The lubricating oil flows down along the wall portion 40a and the guide wall portion 44a, the lubricating oil is collected at the central edge portion 42 and the left and right edge portions 45, respectively, and the lubricating oil collected at the central edge portion 42 is the opening 43. The lubricating oil is dropped onto the meshing portion between the small-diameter gear 24b and the output gear 25a, and the lubricating oil collected at the edge portions 45 on both sides is dropped onto the rolling bearings 34a and 34b from the opening 46.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same part as 1st Embodiment shown in FIGS. 1-7, and the description is omitted in order to avoid duplication of description.

  The two-motor type vehicle drive device A shown in the second embodiment has a reduction gear housing 20 that houses two reduction gears 2L and 2R in parallel in the left and right, as in the first embodiment. The motor housings 3L and 3R of the two electric motors 1L and 1R are fixedly arranged on the left and right of the machine housing 20. In the first embodiment described above, the oil supply plate 40 is fixed to the speed reducer housing 20 in each of the speed reducers 2L and 2R. That is, in the first embodiment, two oil supply plates 40 are prepared, the oil supply plate 40 is sandwiched and attached between the central housing portion 20a and the left side housing portion 20bL, and the center housing portion 20a and the right side housing portion 20bR are attached. The oil supply plate 40 is sandwiched and attached.

  On the other hand, in this 2nd Embodiment, it is comprised so that the oil supply board 40 may be attached to the two reduction gears 2L and 2R with one oil supply board 40. FIG. As shown in FIGS. 9 and 11, the oil supply plate 40 of the second embodiment is formed by integrating the oil supply part 40 </ b> L for the left reduction gear 2 </ b> L and the oil supply part 40 </ b> R for the right reduction gear 2 </ b> R with a connecting part 45. ing. The left and right oil supply portions 40L and 40R are each formed in a tapered shape, that is, a triangular shape, toward the meshing portion of the gear. And the rectangular insertion part 41 inserted in the fitting part 20c provided in the left side housing part 20bL is provided in the end part of the left oil supply part 40L, and the end part of the right oil supply part 40R is A rectangular insertion portion 41 to be inserted into a fitting portion 20c provided in the right side housing 20bL is provided. The oil supply portions 40L and 40R are tapered toward the meshing portion of the gear, and the edge portion 42 that guides the lubricating oil to the tips of the wall portions 40a provided at both ends of the wall portion. And an opening 43 for dropping the flowing lubricating oil is provided at the tip of each wall portion 40a of the oil supply plate portions 40L and 40R.

  The above-described oil supply plate 40 is formed as a separate member from the central housing portion 20a, the left side housing portion 20bL, and the right side housing portion 20bR constituting the speed reducer housing 20, and therefore, by press working, machining, or the like. A shape in which lubricating oil can be easily dropped at a desired position can be manufactured.

  In this 2nd Embodiment, in order to attach the oil supply parts 40L and 40R to the left and right speed reducers 2L and 2R with one oil supply board 40, the oil supply board 40 can penetrate the partition wall 21 of the central housing part 20a. A through hole 20d is provided. For example, the oil supply plate 40 is passed from the left speed reducer 2L through the through hole 20d of the central housing portion 20a, and the insertion portion 41 of the oil supply plate 40 is fitted into the fitting portion 20c provided in the right side housing 20bR. The other insertion portion 41 is fitted into the fitting portion 20c provided in the left side housing portion 20bL, and the speed reducer housing 20 is assembled, whereby the oil supply plate 40 is sandwiched and fixed between the left side housing portion 20bL and the right side housing portion 20bR. can do.

  Thus, in this 2nd Embodiment, since the left and right oil supply parts 40L and 40R can be provided with one oil supply plate 40, the number of parts can be reduced.

  As described above, when one oil supply plate 40 is used for the two left and right speed reducers, screwing, welding, and adhesive other than sandwiching and fixing between the left side housing part 20bL and the right side housing part 20bR are performed. If used, the problem remains as described above. Further, the reduction gear housing 20 that accommodates the two reduction gears 2L and 2R in the left-right parallel is set in the center, and the motor housings 3L and 3R of the two electric motors 1L and 1R are fixedly arranged on the left and right sides of the reduction gear housing 20. In this case, since the screwing, welding, and adhesive provide cantilever support, the oil supply plate 40 may vibrate greatly due to vibration in a portion away from the cantilever support, and may be engaged with the gear. For this reason, it is preferable to sandwich and fix the left side housing part 20bL and the right side housing part 20bR.

  Also in the oil supply plate 40 of the second embodiment, a guide portion that guides the lubricating oil may be provided in the rolling bearing as shown in FIG.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. The scope of the present invention is claimed. The equivalent meanings recited in the claims, and all modifications within the scope.

1L, 1R: Electric motor 2L, 2R: Reducer 3L, 3R: Motor housing 3aL, 3aR: Motor housing body 3bL, 3bR: Outer wall 3cL, 3cR: Inner wall 11: Stator 12: Rotor 12a: Motor shaft 13: Seal Members 14a and 14b: Rolling bearing 15: Constant velocity joint 15a: Outer joint portion 16: Intermediate shaft 20: Reduction gear housing 20a: Central housing portion 20c: Insertion portion 20d: Through hole 20e: Lubricant reservoir 20bL: Left side housing portion 20bR: right side housing portion 21: partition wall 23: input gear shaft 23a: input gear 24: intermediate gear shaft 24a: large diameter gear 24b: small diameter gear 25: output gear shaft 25a: output gears 27a, 27b, 32a, 32b, 35a, 35b: Bearing fitting holes 27c, 35c: Opening Portions 28a, 28b, 34a, 34b, 37a, 37b: Rolling bearings 29: Bolts 31, 39: Oil seal 40: Oil supply plates 40a, 44a: Wall portions 40L, 40R: Oil supply portion 41: Insertion portions 42, 45: Edge portions 43, 46: Opening 44: Guide part 71: Chassis 72: Front wheel 73: Rear wheel A: Vehicle drive device C: Electric vehicle

Claims (5)

An electric motor, and a speed reducer that decelerates the power of the electric motor and transmits the power to the drive wheel. The speed reducer includes an input gear shaft having an input gear to which power is transmitted from the motor shaft, and the drive wheel. A reduction gear housing an output gear shaft having an output gear for transmitting a driving force, and one or more intermediate gear shafts having an intermediate gear provided between the input gear shaft and the output gear shaft and accommodating the reduction gear. In a vehicle drive device that provides a lubricating oil reservoir at the bottom of the machine housing and scrapes the lubricating oil in the lubricating oil reservoir with a gear to lubricate and cool the gear.
The reduction gear housing is divided into a plurality in the axial direction of the gear shaft, and is provided with an oil supply plate that is formed as a separate member with respect to the reduction gear housing and guides the splashed lubricating oil to the gear, and the oil supply plate is divided. A vehicle drive device characterized by being sandwiched and fixed by a reduction gear housing.   2. The divided reduction gear housing is provided with a fitting portion including a rectangular recess, and the oil supply plate is provided with a rectangular insertion portion to be inserted into the fitting portion. The vehicle drive device described.   The oil supply plate has a wall portion that is tapered toward the meshing portion of the gear, and an edge portion that guides the lubricating oil to the tip of the wall portion provided at both ends of the wall portion, The vehicle drive device according to claim 1 or 2, wherein an oil supply plate is fixed to the speed reducer housing so as to be positioned above the meshing portion of the gear.   Each gear shaft is supported via a rolling bearing fitted in a bearing fitting hole provided in the speed reducer housing, and the oil supply plate further includes a guide portion for guiding lubricating oil to the rolling bearing, The guide portion has a guide wall portion formed in a tapered shape toward the rolling bearing, and an edge portion for guiding the lubricating oil to the tip of the guide wall portion provided at the end portion of the guide wall portion. The vehicle drive device according to claim 3.   Two electric motors for independently driving the left and right drive wheels, and two speed reducers for individually decelerating the power of the two electric motors and transmitting them to the left and right drive wheels, A motor housing of two electric motors fixedly arranged at the left and right of the speed reducer housing for accommodating the base speed reducer in parallel in the left and right, and the speed reducer housing for accommodating the two speed reducers in the left and right parallel; It is composed of three pieces, a left housing part and a right housing part fixed so as to close the central housing part and the left and right openings of the central housing part, and the oil supply plate penetrates through the central housing part. The hole according to claim 1, wherein the oil supply plate is penetrated through the penetration portion, and the oil supply plate is sandwiched and fixed between a left side housing portion and a right side housing portion. Vehicle drive device according to item 1 Zureka.

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