JP2018112306A - Power apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power apparatus capable of properly lubricating necessary parts even without an oil pump and an oil tank.SOLUTION: A power apparatus 1A, 1B comprises an electric motor 2, a speed change gear 5, a differential gear 6, and a housing 4 accommodating these. The speed change gear 5 has a first gear 51 mechanically connected to the electric motor 2, a second gear 52 having the same rotation axis with the first gear 51 and mechanically connected to the differential case 61 of the differential gear 6, and a pinion gear 53 meshing with the first gear 51 and the second gear 52. The housing 4 has a storage part 44 for storing lubrication oil, and the second gear 52 is partially located in the storage part 44. On the outer peripheral part of the second gear 52, fin members 58A, 58B are provided for scooping up the lubrication oil.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power unit provided in an electric vehicle.

  Patent Document 1 discloses an electric motor that drives a left wheel and a right wheel of a vehicle, a transmission that is disposed on a power transmission path between the electric motor, the left wheel, and the right wheel, and an output that is shifted by the transmission. A power unit is described that includes a differential that distributes to a left wheel and a right wheel. This type of power unit is provided in an electric vehicle such as a hybrid vehicle or an electric vehicle as a front wheel driving device or a rear wheel driving device, and houses an electric motor, a transmission, and a differential device for appropriate power transmission. It is necessary to provide a storage portion in which the lubricating oil is stored in the housing to be used and to appropriately lubricate the electric motor, the transmission, and the differential device with the lubricating oil stored in the storage portion.

  Therefore, in Patent Document 2, a fin member that scoops up lubricating oil is provided on the outer peripheral portion of the carrier that constitutes the transmission, and the lubricating oil scooped up by the fin member is stored in an oil tank provided in the upper portion of the transmission. There has been proposed a power unit that supplies lubricating oil from the oil tank to a portion requiring lubrication.

JP 2002-104001 A JP 2005-8143 A

  However, the power device disclosed in Patent Document 2 requires a space for providing an oil tank, and there is room for improvement. In addition, it is possible to provide an oil pump that forcibly supplies the lubricating oil stored in the storage part to a portion requiring lubrication, but in this case, not only a space for installing the oil pump is required. , May increase weight and cost.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a power unit that can appropriately lubricate a necessary portion without an oil pump or an oil tank.

In order to achieve the above object, the invention described in claim 1
An electric motor for driving the left wheel and the right wheel of the vehicle (for example, an electric motor 2 in an embodiment described later);
A transmission (for example, a transmission 5 in an embodiment described later) disposed on a power transmission path between the electric motor and the left wheel and the right wheel;
A differential device (for example, a differential device 6 in an embodiment described later) that distributes the output shifted by the transmission to the left wheel and the right wheel;
A power device (for example, power devices 1A and 1B according to embodiments described later) including the electric motor, the transmission, and a housing (for example, a housing 4 according to embodiments described later) that accommodates the differential device. ,
The transmission is
A first gear mechanically connected to the electric motor (for example, a first gear 51 in an embodiment described later);
A second gear (for example, described later) having the same rotational axis as that of the first gear and mechanically connected to a differential case (for example, a differential case 61 in an embodiment described later) of the differential device. The second gear 52) of the embodiment;
A pinion gear that meshes with the first gear and the second gear (for example, a pinion gear 53 in an embodiment described later),
The housing has a storage part for storing a liquid medium (for example, a storage part 44 in an embodiment described later),
A portion of the second gear is located in the reservoir;
Fin members (for example, fin members 58A and 58B in the embodiments described later) that scrape up the liquid medium are provided on the outer peripheral portion of the second gear.

The invention described in claim 2
The power plant according to claim 1,
One end portion of the differential case of the differential device is connected to a bearing support portion of the housing (for example, a bearing support portion 45 of the embodiment described later) via a first bearing (for example, a bearing 66 of the embodiment described later). Supported rotatably,
The fin member scatters the liquid medium toward the bearing support portion.

The invention according to claim 3
The power plant according to claim 2, wherein
The power unit includes a pinion holder (for example, a pinion holder 54 in an embodiment described later) that supports the pinion gear so as to rotate.
The other end of the differential case of the differential device is rotatably supported by the pinion holder via a second bearing (for example, a bearing 65 in an embodiment described later),
The pinion holder is a storage space (for example, a space portion S of an embodiment described later) that stores the liquid medium that is swung up by a rotating body (for example, a second gear 52, a pinion gear 53, and a fin member 58A of the embodiment described later). )
The second bearing is supplied with the liquid medium through the storage space.

The invention according to claim 4
The power plant according to claim 1,
In the pinion gear, one end of a pinion shaft (for example, a pinion shaft 53c in an embodiment described later) has a third bearing (for example, a bearing 55 in an embodiment described later) on a partition wall (for example, a partition wall 43 in an embodiment described later). Supported rotatably through
The fin member scatters the liquid medium toward the partition wall.

The invention described in claim 5
The power plant according to claim 4, wherein
The power unit includes a pinion holder (for example, a pinion holder 54 in an embodiment described later) that supports the pinion gear so as to rotate.
The other end portion of the pinion shaft is rotatably supported by a pinion gear support portion (for example, a pinion gear support portion 54a of the embodiment described later) via a fourth bearing (for example, a bearing 56 of the embodiment described later). And
The pinion holder is a storage space (for example, a space portion S of an embodiment described later) that stores the liquid medium that is swung up by a rotating body (for example, a second gear 52, a pinion gear 53, and a fin member 58B of the embodiment described later). )
The fourth bearing is supplied with the liquid medium through the storage space.

The invention described in claim 6
The power plant according to claim 2 or 3,
The fin member is
A cylindrical portion along the outer peripheral portion of the second gear (for example, a cylindrical portion 58Aa in an embodiment described later);
A weir part (for example, a weir part 58Ab in an embodiment described later) provided at an end of the cylindrical part opposite to the bearing support part and orthogonal to the cylindrical part;
Guide blades provided on the outer peripheral surface of the cylindrical portion and inclined or curved in the rotational direction from the end portion on the bearing support portion side of the cylindrical portion toward the weir portion (for example, guide blades 58Ac in the embodiments described later) And having.

The invention described in claim 7
The power plant according to claim 4 or 5,
The fin member is
A cylindrical portion along the outer peripheral portion of the second gear (for example, a cylindrical portion 58Ba in an embodiment described later);
A weir part (for example, a weir part 58Bb in an embodiment described later) provided at an end of the cylindrical part opposite to the partition part and orthogonal to the cylindrical part;
A guide blade (e.g., a guide blade 58Bc in an embodiment described later) that is erected on the outer peripheral surface of the cylindrical portion and is inclined or curved in the rotational direction from the partition wall side of the cylindrical portion toward the dam portion. Have.

The invention according to claim 8 provides:
The power plant according to any one of claims 1 to 7,
The second gear is made of metal;
The fin member is made of resin.

The invention according to claim 9 is:
The power plant according to any one of claims 1 to 8,
The second gear is a second gear large-diameter portion (for example, a second gear large-diameter portion 52c in an embodiment described later) that constitutes a connection portion (for example, a connection portion 52b in an embodiment described later) with the differential case. ) And a second gear small diameter portion (for example, a second gear small diameter portion 52d in an embodiment described later) constituting a meshing portion (for example, a gear portion 52a in an embodiment described later) with the pinion gear, and the second gear A second gear connecting portion (for example, a second gear connecting portion 52e in an embodiment described later) that connects the large diameter portion and the second gear small diameter portion;
The outer diameter of the second gear small diameter portion is smaller than the outer diameter of the second gear large diameter portion,
The fin member is provided on an outer peripheral surface of the second gear small diameter portion.

The invention according to claim 10 is:
The power plant according to claim 9, wherein
An outer diameter of the fin member is equal to or smaller than an outer diameter of the second gear large diameter portion.

The invention according to claim 11
The power plant according to claim 6 or 7,
The fin member extends over the upper edge portion of the guide wing and the upper edge portion of the dam portion, and has a ceiling portion (for example, ceiling portions 58Ad and 58Bd in the embodiments described later) facing the cylindrical portion. In addition,
Pockets (for example, pockets 58Ae and 58Be in the embodiments described later) for storing the liquid medium are formed by the cylindrical portion, the weir portion, the guide blades, and the ceiling portion.

The invention according to claim 12
The power plant according to claim 11, wherein
The rotation direction is the rotation direction of the second gear when the vehicle moves forward.

  According to the first aspect of the present invention, since the fin member is provided on the outer peripheral portion of the second gear, a part of which is located in the storage portion, the liquid medium scraped up by the fin member is applied to a portion requiring lubrication. By supplying, a necessary part can be appropriately lubricated without an oil pump or an oil tank.

  According to the second aspect of the present invention, the first bearing that rotatably supports the one end portion of the differential case of the differential device can be lubricated by the liquid medium picked up by the fin member.

  According to invention of Claim 3, the 2nd bearing which supports the other end part of a differential case rotatably can be lubricated using a pinion holder.

  According to invention of Claim 4, the 3rd bearing which supports the one end part of a pinion shaft rotatably can be lubricated with the liquid medium which the fin member scooped up.

  According to invention of Claim 5, the 4th bearing which supports the other end part of a pinion shaft rotatably can be lubricated using a pinion holder.

  According to invention of Claim 6, a liquid medium can be scattered toward a bearing support part by the guide blade and dam part of a fin member.

  According to the seventh aspect of the present invention, the liquid medium can be scattered toward the partition wall by the guide blades and the weir of the fin member.

  According to the eighth aspect of the present invention, the fin member that does not require great rigidity is made a member separate from the second gear, and the fin member is made of resin, so that the weight can be reduced.

  According to the ninth aspect of the invention, the fin member can be reduced in the radial direction by providing the fin member on the outer peripheral surface of the second gear small-diameter portion.

  According to the invention described in claim 10, by suppressing the outer diameter of the fin member to be equal to or smaller than the outer diameter of the second gear large diameter portion, it is possible to prevent the fin member from projecting in the radial direction.

  According to the eleventh aspect of the present invention, since the liquid medium can be stored in the pockets of the fin member, more liquid medium can be scattered toward the bearing support portion.

  According to the twelfth aspect of the present invention, appropriate lubrication can be performed when the vehicle moves forward with high frequency.

It is sectional drawing of the power plant which concerns on 1st Embodiment of this invention, and is AI-AI sectional drawing of FIG. FIG. 2 is an internal side view of the power unit of FIG. 1 when a partition wall and a pinion gear are viewed from the differential side. It is the perspective view which looked at the pinion gear, the 2nd gear, and the pinion holder (the bearing is omitted) from the differential device side. FIG. 4 is a sectional view taken along the line BI-BI in FIG. 3. It is the perspective view which looked at the principal part of the pinion holder from the pinion gear side. It is a fragmentary sectional view of the power plant of FIG. 1, and is a CI-CI sectional view of FIG. It is a perspective view of the 2nd gear in the power plant of FIG. It is a graph which shows the relationship between a rotation speed and scraping loss. It is sectional drawing of the power plant which concerns on 2nd Embodiment of this invention, and is AII-AII sectional drawing of FIG. It is the internal side view of the power unit which looked at the partition and the pinion gear from the differential side. It is the perspective view which looked at the pinion gear, the 2nd gear, and the pinion holder (the bearing is omitted) from the differential device side. It is BII-BII sectional drawing of FIG. It is the perspective view which looked at the principal part of the pinion holder from the pinion gear side. It is a fragmentary sectional view of the power plant of FIG. 9, and is a CII-CII sectional view of FIG. FIG. 10 is a perspective view of a second gear in the power plant shown in FIG. 9.

Hereinafter, embodiments of a power plant according to the present invention will be described with reference to the drawings.
<First Embodiment>
First, the power plant 1A according to the first embodiment will be described with reference to FIGS.
The power device 1A according to the present embodiment uses the electric motor 2 as a drive source for driving an axle, and is provided in an electric vehicle such as a hybrid vehicle or an electric vehicle as a front wheel drive device or a rear wheel drive device.

[Power equipment]
In FIG. 1, 3 </ b> A and 3 </ b> B are left and right axles, which are arranged coaxially along the vehicle width direction. The housing 4 of the power unit 1A is generally formed in a substantially cylindrical shape, and includes an electric motor 2 for driving an axle, a transmission 5 for decelerating driving rotation of the electric motor 2, and a drive decelerated by the transmission 5. A differential 6 for distributing the rotation to the axles 3A and 3B is arranged.

  The housing 4 includes a first case 41 that houses the electric motor 2, and a second case 42 that houses the transmission 5 and the differential device 6. A partition wall 43 is provided at the boundary between the first case 41 and the second case 42, and the partition wall 43 partitions the internal space of the first case 41 and the internal space of the second case 42. The partition wall 43 is fastened to a step portion 41 b provided on the outer peripheral portion of the first case 41 via a bolt 47. For this reason, the mating surface A1 of the first case 41 and the partition wall 43 is located closer to the first case 41 than the mating surface A2 of the first case 41 and the second case 42. The bottom portion of the housing 4 functions as a storage portion 44 that stores the lubricating oil (liquid medium), and the lubricating oil is stored up to a static oil level L shown in FIG. This static oil level L is an air gap G (a gap secured between the inner periphery of the stator 21 and the outer periphery of the rotor 22 to be described later) in order to reduce the scraping loss of the lubricating oil in the motor 2. ) Is set lower. As shown in FIG. 2, a communication port 43 a that allows the lubricating oil to flow is formed in the lower portion of the partition wall 43.

[Electric motor]
The electric motor 2 includes a stator 21 that is fixed to the inner peripheral portion of the first case 41 and a rotor 22 that is rotatably arranged on the inner peripheral side of the stator 21. A rotor shaft 23 that surrounds the outer periphery of one axle 3A is coupled to the inner periphery of the rotor 22, and the end of the first case 41 is coaxially rotatable with the axle 3A. It is supported by the wall 41a and the partition wall 43 via bearings 24 and 25. Further, one end side of the axle 3A and the rotor shaft 23 penetrates the partition wall 43 and extends into the second case 42, and the other end side of the axle 3A penetrates the end wall 41a of the first case 41 to be a housing. 4 extends outward.

[transmission]
The transmission 5 has a first gear 51 mechanically connected to the electric motor 2, and the same rotational axis as the first gear 51, and is mechanically connected to a differential case 61 of the differential device 6. A first gear 51, a plurality of pinion gears 53 that mesh with the first gear 51 and the second gear 52, and a pinion holder 54 that supports the plurality of pinion gears 53 so that they can rotate and cannot revolve. When the drive rotation of the electric motor 2 is input, the drive rotation decelerated via the pinion gear 53 and the second gear 52 is output to the differential case 61 of the differential device 6.

  The first gear 51 is composed of an external gear and is formed integrally with the rotor shaft 23. The pinion gear 53 includes a large-diameter gear 53a composed of an external gear, a small-diameter gear 53b composed of an external gear, and a pinion shaft 53c that supports the large-diameter gear 53a and the small-diameter gear 53b so as to be integrally rotatable. The large diameter gear 53 a is coupled to the motor 2 side of the pinion shaft 53 c and meshes with the first gear 51. The small diameter gear 53b is integrally formed on the differential device 6 side of the pinion shaft 53c and meshes with the second gear 52. The end of the pinion shaft 53c is rotatably supported by the partition wall 43 via a bearing 55, and the end of the differential 6 side is rotated by a pinion gear support 54a of the pinion holder 54 via a bearing 56. Supported as possible.

As shown in FIG. 2, the transmission 5 according to the present embodiment includes three pinion gears 53. The three pinion gears 53 are arranged at equal intervals (120 ° intervals) in the circumferential direction around the first gear 51. At least one of the three pinion gears 53 is partly or wholly located in the storage unit 44 described above, and functions as a rotating body that scoops up the lubricating oil in the storage unit 44 by rotation associated with driving of the electric motor 2. Yes. In the example shown in FIG. 2, the lowermost pinion gear 53 disposed immediately below the first gear 51 is caused to function as a rotating body that scoops up the lubricating oil, and the scrubbed lubricating oil is supplied to the upper two pinion gears 53. Yes. Here, assuming that the pinion gear 53 rotates counterclockwise toward FIG. 2, the lubricating oil scooped up by the rotation of the lowermost pinion gear 53 is mainly supplied to the pinion gear located on the upper left, and further on the upper left. Lubricating oil scattered by the rotation of the pinion gear that is positioned is mainly supplied to the pinion gear that is positioned at the upper right.

  The second gear 52 has a gear portion 52 a formed of an internal gear and meshes with the small-diameter gear 53 b of the pinion gear 53. The second gear 52 includes a connection portion 52b extending from the gear portion 52a to the differential device 6 side across the outer peripheral side of the pinion holder 54 (pinion gear support portion 54a), and the connection portion 52b is a connection means such as a spline. Is mechanically connected to the differential case 61 of the differential device 6 via In other words, the second gear 52 includes a second gear large diameter portion 52c that constitutes a connection portion 52b with the differential case 61, a second gear small diameter portion 52d that constitutes a gear portion 52a that meshes with the pinion gear 53, and a second gear 52a. A second gear connecting portion 52e that connects the gear large diameter portion 52c and the second gear small diameter portion 52d. The outer diameter of the second gear small diameter portion 52d is outside the second gear large diameter portion 52c. It is smaller than the diameter. Further, the second gear 52 has a lower end portion located in the storage unit 44 described above, and also functions as a rotating body that scoops up the lubricating oil in the storage unit 44 by rotation accompanying driving of the electric motor 2.

  As shown in FIGS. 3 to 5, the pinion holder 54 includes three pinion gear support portions 54 a that rotatably support the pinion shaft 53 c of the pinion gear 53 via a bearing 56, and three fixing portions that are fixed to the partition wall 43. 54b and a bottomed cylindrical cup portion 54c formed at the center of the pinion holder 54 (inner diameter side of the pinion gear support portion 54a and the fixed portion 54b).

  The pinion gear support portion 54 a is different from the meshing portion M of the second gear 52 mechanically connected to the differential case 61 of the differential device 6 and the small-diameter gear 53 b of the pinion gear 53. It is arranged on the 61 side. Thereby, the other end side of the pinion shaft 53c supported at one end side by the partition wall 43 via the bearing 55 is supported by the pinion gear support portion 54a via the bearing 56, so that the pinion gear 53 is appropriately supported in a both-end supported state. It becomes possible.

  The three fixing portions 54 b are located at intermediate portions of the pinion gear support portions 54 a adjacent to each other in the circumferential direction, and are fastened to the partition wall 43 through bolts 57. As a result, the partition wall 43 serves both as a support member for the pinion shaft 53 c and a support member for the pinion holder 54.

  The cup portion 54c surrounds the outer periphery of one axle 3A via the space portion S from the one end side to the other end side of the meshing portion M in the axial direction and on the inner peripheral side of the meshing portion M in the radial direction. A through hole 54e through which one axle 3A passes is formed in the bottom 54d on one end side. Further, the inner peripheral portion on the other end side of the cup portion 54 c supports the one end side of the differential case 61 via a bearing 65 so as to be rotatable. As a result, the pinion holder 54 is used both as a support member for the pinion gear 53 and a support member for the differential case 61.

[Differential equipment]
The differential device 6 distributes the drive rotation input from the second gear 52 to the differential case 61 to the left and right axles 3A and 3B, while allowing a difference in rotation between the left and right axles 3A and 3B. A case 61, a differential pinion shaft 62, a differential pinion gear 63, and left and right side gears 64A and 64B are provided.

  The differential case 61 includes a spherical differential case main body 61a that houses the differential pinion shaft 62, the differential pinion gear 63, and the left and right side gears 64A and 64B, and a radial extension from the outer periphery of the differential case main body 61a. The input plate 61b mechanically connected to the two gears 52 and left and right extending portions 61c and 61d extending in the axial direction from both side portions of the differential case body 61a are provided. One extending portion 61 c supports one axle 3 </ b> A rotatably at the inner peripheral portion, and the outer peripheral portion is rotatably supported by the pinion holder 54 via the bearing 65. The other extending portion 61d supports the other axle 3B rotatably at the inner peripheral portion, and the bearing supporting portion 45 whose outer peripheral portion is provided on the end wall 42a of the second case 42 via the bearing 66. It is supported in a rotatable manner.

  The differential pinion shaft 62 is supported by the differential case body 61a so as to face in a direction orthogonal to the axles 3A and 3B, and can rotate two differential pinion gears 63 made of bevel gears inside the differential case body 61a. I support it. That is, the differential pinion shaft 62 allows the differential pinion gear 63 to rotate while revolving the differential pinion gear 63 according to the rotation of the differential case 61.

  The left and right side gears 64A and 64B are bevel gears, are rotatably supported inside the differential case body 61a so as to mesh with the differential pinion gear 63 from both sides, and via connecting means such as a spline. It is mechanically connected to the left and right axles 3A, 3B. When the differential pinion gear 63 revolves without rotating, for example, when traveling straight, the left and right side gears 64A and 64B rotate at a constant speed, and the driving rotation is transmitted to the left and right axles 3A and 3B. Further, when driving on a curve or turning left or right, the differential pinion gear 63 rotates, whereby the left and right side gears 64A and 64B rotate relative to each other, and a rotation difference between the left and right axles 3A and 3B is allowed.

[Lubrication function of pinion holder]
Next, the lubrication function of the pinion holder 54 will be described.

  The pinion holder 54 has a storage space in which the second gear 52 and the pinion gear 53 store the lubricating oil that has been scooped up from the storage portion 44 of the housing 4. This storage space is the above-described space portion S formed by the cup portion 54c and the one axle 3A, and the later-described communication in which the lubricating oil scraped up by the second gear 52 and the pinion gear 53 communicates with the space portion S. It flows into the space S through the holes 54f and 54g.

  The lubricating oil that has flowed into the space portion S is disposed adjacent to the space portion S and supplied to the above-described bearing 65 that rotatably supports one end side of the differential case 61, and is appropriately lubricated. Lubricating oil is also distributed from the space S to the inside of the differential 6 that needs lubrication and the electric motor 2 that needs cooling by the lubricating oil. More specifically, the lubricating oil is supplied from the space S to the inside of the differential device 6 through the gap between the axle 3A and the extension 61c of the differential case 61, and from the space S to the axle 3A. It is supplied to the electric motor 2 side through a gap with the rotor shaft 23.

  As shown in FIG. 5, the pinion holder 54 includes a first guide portion 54 i that receives the lubricating oil scraped up by the second gear 52 and the pinion gear 53 on a first surface 54 h facing the pinion gear 53. The first guide portion 54i is a protruding portion formed on both sides of the cup portion 54c and extending linearly toward the cup portion 54c, and guides the received lubricating oil to the cup portion 54c. A communication hole 54f is formed in the connection portion between the first guide portion 54i and the cup portion 54c, and the lubricating oil received by the first guide portion 54i is stored in the space S through the communication hole 54f. .

  As shown in FIG. 3, the pinion holder 54 has a second guide portion 54 k that receives the lubricating oil scraped up by the second gear 52 and the pinion gear 53 on the second surface 54 j facing the differential case 61 of the differential device 6. Prepare. The second guide portion 54k is a protrusion formed above the cup portion 54c and extending in an arc shape below the uppermost fixed portion 54b, and guides the received lubricating oil to the cup portion 54c. A communication hole 54g is formed in the connection portion between the second guide portion 54k and the cup portion 54c, and the lubricating oil received by the second guide portion 54k is stored in the space S through the communication hole 54g. . The communication hole 54g also communicates with the first surface 54h side of the pinion holder 54.

  As shown in FIGS. 3 and 4, among the pinion gear support portions 54 a of the pinion holder 54, the above-described pinion gear support portion 54 a that supports the upper two pinion gears 53 faces the differential case 61 of the differential device 6. A pocket 54m for storing lubricating oil is provided at the opening end on the second surface 54j side. The pocket 54m enables appropriate lubrication of the bearing 56 by temporarily retaining the lubricating oil supplied to the pinion gear support 54a.

  By the way, a part of the lubricating oil supplied from the space S to the bearing 65 passes through the bearing 65 and flows to the outer periphery of the differential case 61, and receives a centrifugal force accompanying the rotation of the differential case 61. It moves in the outer diameter direction along the plate 61b. The input plate 61b of the present embodiment includes a third guide portion 61e that guides the lubricant that moves in the outer diameter direction along the input plate 61b to the upper two pinion gear support portions 54a. The third guide portion 61e is an edge portion of an annular recess formed on the surface of the input plate 61b facing the pinion gear 53, and the edge portion formed at a position facing the pinion gear support portion 54a in the radial direction The lubricating oil that moves in the outer diameter direction along 61b is guided to the pinion gear support 54a. A part of the lubricating oil scraped up by the second gear 52 has the same flow.

[Fin member]
Next, the fin member 58A provided with the second gear 52 will be described with reference to FIG. 1, FIG. 4, and FIG.

  A fin member 58 </ b> A that scoops up the lubricating oil in the reservoir 44 according to the rotation of the second gear 52 is provided on the outer peripheral portion of the second gear 52. The fin member 58A is provided at the cylindrical portion 58Aa along the outer peripheral portion of the second gear 52 and at the end of the cylindrical portion 58Aa on the electric motor 2 side (the side opposite to the bearing support portion 45), and is orthogonal to the cylindrical portion 58Aa. The dam portion 58Ab extending in the outer diameter direction and the outer peripheral surface of the cylindrical portion 58Aa are erected, and the rotation direction of the second gear 52 from the end of the cylindrical portion 58Aa on the bearing support portion 45 side toward the dam portion 58Ab (the vehicle is A plurality of guide blades 58Ac that are curved (or inclined) in the rotational direction when moving forward, and the plurality of guide blades 58Ac are formed on the outer peripheral surface of the cylindrical portion 58Aa via a predetermined interval in the circumferential direction. It is installed side by side.

  According to such a fin member 58A, according to the rotation of the second gear 52, the plurality of guide blades 58Ac sequentially scoop up the lubricant in the storage portion 44, and the plurality of guide blades 58Ac scooped up the lubricant. While the outflow to the electric motor 2 side is suppressed by the weir portion 58Ab, the lubricating oil scooped up by the plurality of guide blades 58Ac is scattered toward the bearing support portion 45 side based on the guide action of the guide blades 58Ac. The lubricating oil splashed to the bearing support portion 45 side by the fin member 58 </ b> A is supplied to the bearing 66 along the inner peripheral surface of the second case 42.

  The fin member 58A extends over the upper edge portion of the guide wing 58Ac and the upper edge portion of the weir portion 58Ab, and further includes a ceiling portion 58Ad facing the cylindrical portion 58Aa, and the cylindrical portion 58Aa and the weir portion 58Ab. A pocket 58Ae for storing lubricating oil is formed by the guide blade 58Ac and the ceiling portion 58Ad. According to such a fin member 58 </ b> A, the lubricating oil can be stored in the pocket 58 </ b> Ae, so that more lubricating oil can be scraped up and scattered toward the bearing 66. Further, according to such a fin member 58A, it is possible to increase the amount of lubricating oil scraped in the low rotation range, and to sufficiently lower the oil level of the reservoir 44 before reaching the middle and high speed range, As shown in FIG. 8, it is possible to improve the fuel consumption by reducing the scraping loss N in the medium and high speed range that has a large influence on the fuel consumption.

  The fin member 58A is provided on the outer peripheral surface of the second gear small diameter portion 52d whose outer diameter is smaller than that of the second gear large diameter portion 52c on the outer peripheral surface of the second gear 52. Compared with the case where the fin member 58A is provided on the outer peripheral surface, the radial size of the fin member 58A can be reduced.

  Further, the outer diameter of the fin member 58A is equal to or smaller than the outer diameter of the second gear large diameter portion 52c, and the fin member 58A has the second diameter larger than the outer diameter of the second gear large diameter portion 52c. The gear 52 is prevented from projecting in the radial direction from the outer periphery, and the enlargement of the power unit 1A is avoided.

  The fin member 58A can be formed integrally with the metal second gear 52. However, since the fin member 58A does not require great rigidity, the fin member 58A is made of a resin that is a separate member from the second gear 52. Can be achieved.

  As described above, according to the present embodiment, since the fin member 58A is provided on the outer peripheral portion of the second gear 52, a part of which is located in the storage portion 44, the lubricating oil scraped up by the fin member 58A is used. By supplying to a site requiring lubrication, the necessary site can be properly lubricated without an oil pump or an oil tank. The present invention does not exclude a power unit provided with an oil pump or an oil tank.

  Further, in the present embodiment, the bearing 66 that rotatably supports one end portion of the differential case 61 of the differential device 6 can be lubricated by the lubricating oil scooped up by the fin member 58A.

  In the present embodiment, the pinion holder 54 can be used to lubricate the bearing 65 that rotatably supports the other end of the differential case 61.

  In the present embodiment, the fin member 58A that does not require great rigidity is made a separate member from the second gear 52, and the fin member 58A is made of resin, so that the weight can be reduced.

  In the present embodiment, the fin member 58A is provided on the outer peripheral surface of the second gear small diameter portion 52d, whereby the fin member 58A can be downsized in the radial direction.

  In the present embodiment, by suppressing the outer diameter of the fin member 58A to be equal to or smaller than the outer diameter of the second gear large diameter portion 52c, it is possible to prevent the fin member 58A from projecting in the radial direction.

  In the present embodiment, the lubricating oil can be scattered toward the bearing support portion 45 by the guide blades 58Ac and the weir portions 58Ab of the fin member 58A.

  Further, in this embodiment, since the lubricating oil can be stored in the pocket 58Ae of the fin member 58A, more lubricating oil can be scattered toward the bearing support portion 45.

  Moreover, in this embodiment, appropriate lubrication can be performed when the vehicle moves forward with high frequency.

Second Embodiment
Next, a power plant 1B according to the second embodiment will be described with reference to FIGS.
In the power unit 1B of the second embodiment, since the fin member 58B is different from the fin member 58A of the power unit 1A of the first embodiment, the fin member 58B will be described in detail, and the same components are denoted by the same reference numerals. Therefore, the description is omitted. In addition, as shown in FIGS. 9, 10, and 12, in the power unit 1 </ b> B, the large-diameter gear 53 a of the transmission 5 is provided with a plurality of through holes 53 h at positions that overlap the bearing 55 in the radial direction. Is different.

[Fin member]
Hereinafter, the fin member 58 </ b> B provided with the second gear 52 will be described with reference to FIGS. 9, 12, and 15.

  A fin member 58 </ b> B that scoops up the lubricating oil in the reservoir 44 according to the rotation of the second gear 52 is provided on the outer periphery of the second gear 52. The fin member 58B is provided at the cylindrical portion 58Ba along the outer peripheral portion of the second gear 52 and at the end of the cylindrical portion 58Ba on the differential device 6 side (opposite side of the partition wall 43), and is orthogonal to the cylindrical portion 58Ba. The dam portion 58Bb extending in the outer diameter direction and the outer peripheral surface of the cylindrical portion 58Ba are erected, and the rotation direction of the second gear 52 (the vehicle advances) from the end of the cylindrical portion 58Ba on the partition wall 43 side toward the dam portion 58Bb. And a plurality of guide vanes 58Bc that are curved (or inclined) in the circumferential direction, and the plurality of guide vanes 58Bc are arranged in parallel on the outer circumferential surface of the cylindrical portion 58Ba at a predetermined interval in the circumferential direction. Has been.

  According to such a fin member 58B, according to the rotation of the second gear 52, the plurality of guide blades 58Bc sequentially scoop up the lubricating oil in the storage portion 44, and the plurality of guide blades 58Bc scoop up the lubricating oil. The oil flowing up to the differential device 6 side is suppressed by the weir portion 58Bb, and the lubricating oil scooped up by the plurality of guide blades 58Bc is scattered toward the partition wall 43 side based on the guide action of the guide blades 58Bc. The lubricating oil splashed to the partition wall 43 side by the fin member 58B gets over the outer peripheral side of the large diameter gear 53a and is supplied to the bearing 55, and also through the plurality of through holes 53h formed in the large diameter gear 53a. To be supplied.

  The fin member 58B extends over the upper edge portion of the guide wing 58Bc and the upper edge portion of the weir portion 58Bb, and further includes a ceiling portion 58Bd facing the cylindrical portion 58Ba, and the cylindrical portion 58Ba and the weir portion 58Bb. A pocket 58Be for storing lubricating oil is formed by the guide blade 58Bc and the ceiling portion 58Bd. According to such a fin member 58 </ b> B, the lubricating oil can be stored in the pocket 58 </ b> Be, so that more lubricating oil can be scraped up and scattered toward the bearing 55. In addition, according to such a fin member 58B, the amount of lubricating oil scraped up in the low rotation range can be increased, and the oil level of the reservoir 44 can be sufficiently lowered before reaching the middle and high speed range, As shown in FIG. 8, it is possible to improve the fuel consumption by reducing the scraping loss N in the medium and high speed range that has a large influence on the fuel consumption.

  The fin member 58B is provided on the outer peripheral surface of the second gear small diameter portion 52d having an outer diameter smaller than that of the second gear large diameter portion 52c on the outer peripheral surface of the second gear 52. The fin member 58B can be reduced in size in the radial direction as compared with the case where the fin member 58B is provided on the outer peripheral surface.

  Further, the outer diameter of the fin member 58B is equal to or smaller than the outer diameter of the second gear large diameter portion 52c, and the fin member 58B has the second diameter larger than the outer diameter of the second gear large diameter portion 52c. The gear 52 is prevented from projecting in the radial direction from the outer periphery, and the enlargement of the power unit 1B is avoided.

  The fin member 58B can be formed integrally with the metal second gear 52. However, since the fin member 58B does not require great rigidity, the fin member 58B is light by being made of resin, which is a separate member from the second gear 52. Can be achieved.

  As described above, according to the present embodiment, since the fin member 58B is provided on the outer peripheral portion of the second gear 52, a part of which is located in the storage portion 44, the lubricating oil scraped up by the fin member 58B is used. By supplying to a site requiring lubrication, the necessary site can be properly lubricated without an oil pump or an oil tank. The present invention does not exclude a power unit provided with an oil pump or an oil tank.

  Further, in the present embodiment, the bearing 55 that rotatably supports one end of the pinion shaft 53c can be lubricated by the lubricating oil scooped up by the fin member 58B.

  In the present embodiment, the pinion holder 54 is used to lubricate the bearing 56 that rotatably supports the other end of the pinion shaft 53c.

  Further, in the present embodiment, the fin member 58B that does not require great rigidity is made a separate member from the second gear 52, and the fin member 58B is made of resin, so that the weight can be reduced.

  In the present embodiment, the fin member 58B is provided on the outer peripheral surface of the second gear small diameter portion 52d, whereby the fin member 58B can be downsized in the radial direction.

  Further, in the present embodiment, by suppressing the outer diameter of the fin member 58B to be equal to or smaller than the outer diameter of the second gear large diameter portion 52c, it is possible to prevent the fin member 58B from projecting in the radial direction.

  In the present embodiment, the lubricating oil can be scattered toward the partition wall 43 by the guide blades 58Bc and the weir portions 58Bb of the fin member 58B.

  Further, in this embodiment, since the lubricating oil can be stored in the pocket 58Be of the fin member 58B, more lubricating oil can be scattered toward the partition wall 43.

  Moreover, in this embodiment, appropriate lubrication can be performed when the vehicle moves forward with high frequency.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, the number of pinion gears 53 is not limited to three, and may be one or two, or four or more.
The power units 1A and 1B may employ a forced lubrication method using an oil pump in addition to a scraping-type lubrication method.

1A, 1B Power unit 2 Electric motor 4 Housing 43 Partition (partition wall)
44 Storage part 45 Bearing support part 5 Transmission 51 First gear 52 Second gear 52a Gear part (meshing part)
52b Connection portion 52c Second gear large diameter portion 52d Second gear small diameter portion 52e Second gear connection portion 53 Pinion gear 53c Pinion shaft 54 Pinion holder 54a Pinion gear support portion 55 Bearing (third bearing)
56 Bearing (4th bearing)
58A, 58B Fin members 58Aa, 58Ba Cylindrical portions 58Ab, 58Bb Weir portions 58Ac, 58Bc Guide blades 58Ad, 58Bd Ceiling portions 58Ae, 58Be Pocket 6 Differential device 61 Differential case 65 Bearing (second bearing)
66 Bearing (first bearing)
S space

Claims (12)

An electric motor that drives the left and right wheels of the vehicle;
A transmission disposed on a power transmission path between the electric motor and the left and right wheels;
A differential that distributes the output shifted by the transmission to the left wheel and the right wheel;
A power unit comprising: the electric motor; the transmission; and a housing that houses the differential.
The transmission is
A first gear mechanically connected to the electric motor;
A second gear having the same rotational axis as the first gear and mechanically connected to the differential case of the differential;
A pinion gear meshing with the first gear and the second gear,
The housing has a reservoir for storing a liquid medium;
A portion of the second gear is located in the reservoir;
The power unit, wherein a fin member that scoops up the liquid medium is provided on an outer peripheral portion of the second gear. The power plant according to claim 1,
One end portion of the differential case of the differential device is rotatably supported by a bearing support portion of the housing via a first bearing,
The power device, wherein the fin member scatters the liquid medium toward the bearing support portion. The power plant according to claim 2, wherein
The power unit includes a pinion holder that supports the pinion gear so as to rotate,
The other end of the differential case of the differential device is rotatably supported by the pinion holder via a second bearing,
The pinion holder has a storage space for storing the liquid medium scraped up by the rotating body,
The second bearing is a power unit in which the liquid medium is supplied through the storage space. The power plant according to claim 1,
In the pinion gear, one end of the pinion shaft is rotatably supported by the partition wall via the third bearing,
The power device, wherein the fin member scatters the liquid medium toward the partition wall. The power plant according to claim 4, wherein
The power unit includes a pinion holder that supports the pinion gear so as to rotate,
The other end portion of the pinion shaft is rotatably supported by a pinion gear support portion of the pinion holder via a fourth bearing,
The pinion holder has a storage space for storing the liquid medium scraped up by the rotating body,
The fourth bearing is a power unit in which the liquid medium is supplied through the storage space. The power plant according to claim 2 or 3,
The fin member is
A cylindrical portion along the outer periphery of the second gear;
A dam portion provided at an end of the cylindrical portion opposite to the bearing support portion and orthogonal to the cylindrical portion;
And a guide wing that is erected on an outer peripheral surface of the cylindrical portion, and that is inclined or curved in a rotational direction from the bearing support portion side of the cylindrical portion toward the dam portion. The power plant according to claim 4 or 5,
The fin member is
A cylindrical portion along the outer periphery of the second gear;
A dam portion provided at an end of the cylindrical portion opposite to the partition wall, and perpendicular to the cylindrical portion;
And a guide wing that is erected on an outer peripheral surface of the cylindrical portion and that is inclined or curved in a rotational direction from the partition wall side of the cylindrical portion toward the dam portion. The power plant according to any one of claims 1 to 7,
The second gear is made of metal;
The power device, wherein the fin member is made of resin. The power plant according to any one of claims 1 to 8,
The second gear includes a second gear large diameter portion constituting a connection portion with the differential case, a second gear small diameter portion constituting a meshing portion with the pinion gear, the second gear large diameter portion, A second gear connecting portion that connects the second gear small diameter portion,
The outer diameter of the second gear small diameter portion is smaller than the outer diameter of the second gear large diameter portion,
The said fin member is a power unit provided in the outer peripheral surface of the said 2nd gear small diameter part. The power plant according to claim 9, wherein
The power device, wherein an outer diameter of the fin member is equal to or smaller than an outer diameter of the second gear large diameter portion. The power plant according to claim 6 or 7,
The fin member further extends over an upper edge portion of the guide wing and an upper edge portion of the dam portion, and further includes a ceiling portion facing the cylindrical portion,
A power unit in which a pocket for storing the liquid medium is formed by the cylindrical portion, the weir portion, the guide wing, and the ceiling portion. The power plant according to claim 11, wherein
The rotation device is a power unit that is a rotation direction of the second gear when the vehicle moves forward.

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