Power transmission device

Abstract

The invention provides a power transmission device capable of suitably supplying lubricating liquid while suppressing stirring loss. A drive unit (10) is provided with: a driven sprocket (311a); an input shaft (311) that supports the driven sprocket (311a); and a drive unit housing (11) that rotatably supports the input shaft (311). A drive unit housing (11) is provided with: a chain chamber (14) that houses an input shaft (311) and a driven sprocket (311a); a first reservoir (71) that is provided on the bottom surface (14D) of the chain chamber (14) and that stores lubricating oil (R3) such that a part of the driven sprocket (311a) is immersed therein; and a second reservoir (72) that is provided above the input shaft (311) in the chain chamber (14) and that stores the lubricating oil (R3).

Description

Technical Field

[0001] The invention relates to a power transmission device. Background Art

[0002] In recent years, as a concrete measure to combat global climate change, initiatives to achieve a low-carbon society or a decarbonized society have been active. In vehicles such as automobiles, there are demands to reduce CO2 emissions and improve energy efficiency, and the electrification of drive sources is also advancing.

[0003] As the drive source is electrified, the power transmission device has been miniaturized in recent years. In particular, in order to increase the degree of freedom of mounting on the vehicle and expand the vehicle compartment, it is effective to keep the height of the power transmission device low.

[0004] In conventional power transmission devices, lubricating fluid is stored in the lower portion of a housing, and a portion of rotating parts such as gears and sprockets is immersed in the lubricating fluid. The lubricating fluid is drawn up as the rotating parts rotate, thereby lubricating the gears and bearings included in the power transmission device (for example, Patent Document 1).

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2004-180477 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In a power transmission device with a relatively low height, when lubricating oil is supplied by pulling up the rotating parts as in the past, there is a problem that the volume of the rotating parts immersed in the lubricating oil increases, and the stirring loss increases. On the other hand, when the amount of lubricating oil is reduced to reduce the volume of the rotating parts immersed in the lubricating oil, proper lubrication may be hindered.

[0010] The present invention provides a power transmission device capable of appropriately supplying lubricating fluid while suppressing stirring loss.

[0011] Solutions to Solve Problems

[0012] The present invention provides a power transmission device, comprising:

[0013] a first rotating member;

[0014] a first rotating shaft supporting the first rotating member; and

[0015] a housing that rotatably supports the first rotating shaft,

[0016] in,

[0017] The housing comprises:

[0018] a rotating component receiving chamber receiving the first rotating shaft and the first rotating component;

[0019] a first storage portion, which is provided at the bottom of the rotating member accommodation chamber and stores lubricating liquid in a manner that a portion of the first rotating member is immersed therein; and

[0020] The second storage portion is provided at a position above the first rotating shaft in the rotating member accommodating chamber and stores the lubricating fluid.

[0021] Effects of the Invention

[0022] According to the present invention, the lubricating fluid can be appropriately supplied while suppressing the stirring loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a vehicle equipped with a drive unit 10 according to an embodiment of the present invention, as viewed from the left.

[0024] Figure 2 This is a perspective view showing a partially cutaway view of a drive unit 10 according to an embodiment of the present invention.

[0025] Figure 3 It is used to illustrate Figure 2 A partially cutaway stereoscopic view of a power transmission path in the drive unit 10.

[0026] Figure 4 yes Figure 2 A skeleton diagram of the reduction device in the drive unit 10.

[0027] Figure 5 yes Figure 2 A top view and a left side view of the drive unit 10 are shown.

[0028] Figure 6 Observed from the left Figure 2 1 is a perspective view of the left main housing 114 of the drive unit 10.

[0029] Figure 7 yes Figure 5 AA line section view.

[0030] Figure 8 Observed from the right Figure 2 1 is a perspective view of the left main housing 114 of the drive unit 10. Fig. 9 Observed from the left Figure 2 10 is a perspective view of the right main housing 115 of the drive unit 10.

[0031] Fig.10 yes Figure 2 Block diagram of the temperature control system in the drive unit.

[0032] Fig.11 yes Figure 5 BB line cross-sectional view.

[0033] Fig.12 1 is a perspective view of the left main case 114 of the drive unit 10 as viewed from the left, for explaining the flow of the lubricating oil R3 in the chain chamber 14 .

[0034] Fig.13 It is a partial cross-sectional view of the drive unit 10 for explaining the flow of the lubricating oil R3.

[0035] Fig.14 It is a perspective view of the guide member 700 .

[0036] Description of reference numerals:

[0037] 10 Drive unit (power transmission device)

[0038] 11 drive unit housing (housing)

[0039] 14 Chain chamber (rotating parts storage chamber)

[0040] 14D bottom surface (bottom)

[0041] 14L left side (side)

[0042] 14U top surface (wall surface)

[0043] 21 driving shaft (second rotating shaft)

[0044] 21a driving sprocket (second rotating member)

[0045] 71 First storage unit

[0046] 72 Second storage unit

[0047] 74 bearings

[0048] 75 bearings

[0049] 76 bearings

[0050] 77 bearings

[0051] 78 protrusion

[0052] 112b rear connecting path (connecting path)

[0053] 116 baffle

[0054] 311 Input shaft (first rotating shaft)

[0055] 311a Driven sprocket (first rotating member)

[0056] 700 guide parts

[0057] 701 bottom surface

[0058] 702 side face

[0059] 707 Weir

[0060] R3 lubricating oil (lubricating fluid). DETAILED DESCRIPTION

[0061] Hereinafter, a vehicle equipped with a drive unit according to an embodiment of the present invention will be described based on the accompanying drawings. In addition, the accompanying drawings are viewed along the directions indicated by the accompanying drawings. In addition, in this specification, etc., in order to make the description simple and clear, the front and rear, left and right, and up and down directions are described according to the directions observed from the driver of the vehicle. In the accompanying drawings, the front of the vehicle is represented as Fr, the rear is represented as Rr, the left is represented as L, the right is represented as R, the top is represented as U, and the bottom is represented as D.

[0062]

Overall structure of the vehicle

[0063] like Figure 1 As shown, the vehicle V of this embodiment has a pair of left and right front wheels FW, a pair of left and right rear wheels RW, and a bottom panel FP constituting the bottom surface of the vehicle V. The vehicle V is divided into a vehicle compartment CB and a front cabin FRM in front thereof by a front control panel DP extending in the up-down direction above the bottom panel FP. Front seats FS and rear seats RS are provided in the vehicle compartment CB.

[0064] The vehicle V includes a drive unit 10 as a drive source, a battery pack IPU storing power supplied to the drive unit 10, a charging and supply control device CHGR controlling input and output power of the battery pack IPU, a power receiving unit PR capable of receiving power from an external power source, a radiator 611 for circulating cooling water R1 for cooling a control device 50 described later of the drive unit 10, and a cooling water pump 612 for pressurizing and conveying the cooling water R1. The cooling water R1 is, for example, cooling water called LLC (Long Life Coolant).

[0065] The drive unit 10 is arranged below the floor panel FP behind the rear seat RS. The battery pack IPU is arranged below the bottom surface of the vehicle compartment CB below the floor panel FP. The battery pack IPU accommodates a plurality of battery modules in which a plurality of cells are stacked. Each cell is a secondary battery capable of charge and discharge, such as a lithium-ion battery or an all-solid-state battery.

[0066] The charging and power supply control device CHGR is accommodated in the front compartment FRM. The power receiving unit PR is provided on the upper surface of the front compartment FRM and is electrically connected to the charging and power supply control device CHGR. The radiator 611 is accommodated in the front compartment FRM and is arranged near the front end in the front compartment FRM. The radiator 611 is a heat exchanger that cools the cooling water R1 by heat exchange between the external air brought by the running wind of the vehicle V and the circulating cooling water R1. The cooling water pump 612 is accommodated in the front compartment FRM.

[0067] [Overall structure of the drive unit]

[0068] like Figure 2 and Figure 3 As shown, the drive unit 10 includes a drive motor 20, a reduction gear 30 that reduces the power output from the drive motor 20 and outputs it to the outside, a power transmission chain 40 that transmits the power output from the drive motor 20 to the reduction gear 30, a control device 50 that controls the drive motor 20, an oil pump 621 that pressurizes and delivers motor cooling oil R2, and an oil cooler 63 that performs heat exchange between cooling water R1 and motor cooling oil R2. The motor cooling oil R2 is, for example, an oil called ATF (Automatic Transmission Fluid; automatic transmission oil).

[0069] In the drive unit 10, the drive motor 20, the reduction gear 30, the power transmission chain 40, and the control device 50 are accommodated in the drive unit case 11. The oil pump 621 and the oil cooler 63 are mounted on the left side surface of the drive unit case 11.

[0070] The driving motor 20 is a so-called inner rotor type motor, which includes a driving shaft 21, a rotor 22 mounted on the driving shaft 21 and rotating integrally with the driving shaft 21, and a stator 23 arranged to be radially opposed to the rotor 22 with a small gap radially outside the rotor 22.

[0071] In this embodiment, the drive motor 20 is arranged in the drive unit 10 with its axial direction (ie, the drive shaft 21) oriented horizontally in the left-right direction. Thus, by arranging the drive shaft 21 oriented horizontally, the vertical dimension of the drive unit 10 can be made compact.

[0072] The stator 23 includes a stator core 231 and a coil 232 mounted on the stator core 231 and composed of a plurality of windings such as a U-phase, a V-phase, and a W-phase.

[0073] The stator core 231 is formed by laminating a plurality of thin electromagnetic steel plates having a substantially annular shape in the axial direction.

[0074] The stator core 231 includes a yoke 231a that forms a substantially annular shape of the outer ring portion of the stator core 231 when viewed from the axial direction, and a plurality of teeth 231b that protrude radially from the inner circumferential surface of the yoke 231a toward the center. The plurality of teeth 231b are arranged at equal intervals along the circumferential direction of the stator core 231 when viewed from the axial direction. A groove 231c is formed between adjacent teeth 231b in the circumferential direction of the stator core 231. A plurality of grooves 231c are formed at equal intervals along the circumferential direction of the stator core 231. Each tooth 231b and groove 231c extends along the axial direction of the stator core 231.

[0075] The coil 232 is composed of a plurality of conductor segments inserted into the slots 231 c of the stator core 231 . The conductor segments are inserted into all of the slots 231 c formed in a plurality along the circumferential direction of the stator core 231 .

[0076] The coil 232 has a left coil end 232L protruding axially outward from a left end surface on one axial side of the stator core 231 , and a right coil end 232R protruding axially outward from a right end surface on the other axial side of the stator core 231 .

[0077] A drive sprocket 21a around which a power transmission chain 40 is wound is attached to the left end portion of the drive shaft 21. The drive sprocket 21a rotates integrally with the drive shaft 21.

[0078] like Figure 3 and Figure 4 As shown, the reduction gear device 30 includes a planetary gear mechanism 31 and a differential gear mechanism 32 .

[0079] First, the planetary gear mechanism 31 will be described.

[0080] The planetary gear mechanism 31 includes an input shaft 311 , a sun gear 312 , a plurality of planetary pinion shafts 313 , the same number of stepped pinion gears 314 as the planetary pinion shafts 313 , a planetary carrier 316 , and a ring gear 317 .

[0081] In the present embodiment, the planetary gear mechanism 31 is arranged in the front-to-back direction behind the driving motor 20. The planetary gear mechanism 31 is arranged so that the axial direction (i.e., the input shaft 311) is parallel to the axial direction of the driving motor 20 and faces the left-right direction. In addition, the input shaft 311 of the planetary gear mechanism 31 is arranged at a position at substantially the same height as the driving shaft 21 of the driving motor 20 in the up-down direction. Furthermore, the outer diameter of the planetary gear mechanism 31 is substantially the same as the outer diameter of the driving motor 20, and the height of the driving unit 10 in the up-down direction is low.

[0082] The input shaft 311 is a hollow shaft, and the left drive shaft described later passes through the inside of the input shaft 311. A driven sprocket 311a around which the power transmission chain 40 is wound is mounted at the left end of the input shaft 311. The driven sprocket 311a rotates integrally with the input shaft 311. The diameter of the driven sprocket 311a is larger than the diameter of the drive sprocket 21a mounted on the drive shaft 21 of the drive motor 20, and the number of teeth of the driven sprocket 311a is greater than the number of teeth of the drive sprocket 21a.

[0083] The sun gear 312 is an external gear provided on the input shaft 311 , and rotates integrally with the input shaft 311 on the same rotation axis.

[0084] A plurality of pinion shafts 313 are arranged at equal intervals in the circumferential direction on the radially outer side of the sun gear 312 along the outer circumferential surface of the sun gear 312 in a manner parallel to the input shaft 311 and oriented in the left-right direction. In the present embodiment, four pinion shafts 313 are arranged at 90-degree intervals in the circumferential direction on the radially outer side of the sun gear 312 along the circumferential direction of the input shaft 311.

[0085] The stepped pinion 314 having the first planetary gear 314a and the second planetary gear 314b that rotate integrally is supported on each planetary pinion shaft 313 in a manner that allows free rotation. In the present embodiment, the first planetary gear 314a is arranged on the left side and the second planetary gear 314b is arranged on the right side on each planetary pinion shaft 313. Therefore, four first planetary gears 314a and four second planetary gears 314b are provided in a circular ring shape at intervals of 90 degrees along the circumference of the input shaft 311.

[0086] The first planetary gears 314a are external gears disposed on the outer circumference of the sun gear 312 and meshing with the sun gear 312. The four first planetary gears 314a are arranged in an annular shape at 90-degree intervals along the outer circumference of the sun gear 312. The four first planetary gears 314a mesh with the outer circumference of the sun gear 312, respectively.

[0087] The second planetary gears 314b are external gears disposed on the inner circumference of the ring gear 317 and meshing with the ring gear 317. Four second planetary gears 314b are arranged in an annular shape at 90 degree intervals along the inner circumference of the ring gear 317. In this embodiment, the second planetary gears 314b are external gears with a smaller diameter than the first planetary gears 314a.

[0088] The planetary carrier 316 is connected to the four planetary pinion shafts 313. The planetary carrier 316 and the four planetary pinion shafts 313 are integrally rotatable on a rotation axis coaxial with the input shaft 311 (and the sun gear 312).

[0089] Therefore, the stepped pinion 314 having the first planetary gear 314a and the second planetary gear 314b freely rotates about the planetary pinion shaft 313, and freely revolves on a rotation axis coaxial with the input shaft 311 (and the sun gear 312) in an integrated manner with the planetary pinion shaft 313. Furthermore, the planet carrier 316 rotates on a rotation axis coaxial with the input shaft 311 (and the sun gear 312) in an integrated manner with the revolving motion of the stepped pinion 314.

[0090] The ring gear 317 is an annular internal gear disposed so as to surround the four annularly disposed second planetary gears 314b and whose inner peripheral surface meshes with each second planetary gear 314b. In the present embodiment, the ring gear 317 is fixed to the drive unit case 11 and does not rotate.

[0091] Next, the differential gear mechanism 32 will be described.

[0092] The differential gear mechanism 32 includes a differential case 321, a differential pinion shaft 322 supported by the differential case 321, a first bevel gear 323a and a second bevel gear 323b rotatably supported by the differential pinion shaft 322, a left side gear 324L and a right side gear 324R meshing with the first bevel gear 323a and the second bevel gear 323b, and a left drive shaft 325L and a right drive shaft 325R.

[0093] The differential case 321 is formed integrally with the planetary carrier 316 of the planetary gear mechanism 31. Therefore, the differential case 321 rotates integrally with the planetary carrier 316 of the planetary gear mechanism 31 on a rotation axis coaxial with the input shaft 311. The differential case 321 includes a housing portion 321a that houses the differential pinion shaft 322, the first bevel gear 323a, the second bevel gear 323b, the left gear 324L, and the right gear 324R.

[0094] The differential pinion shaft 322 is accommodated in the accommodating portion 321a of the differential case 321 and is supported by the differential case 321. The differential pinion shaft 322 is arranged in the accommodating portion 321a of the differential case 321 in a manner orthogonal to the rotation axis of the differential case 321. The differential pinion shaft 322 rotates integrally with the differential case 321 about the rotation axis of the differential case 321.

[0095] The first bevel gear 323a is accommodated in the accommodating portion 321a of the differential case 321 and is rotatably supported by the differential pinion shaft 322. The first bevel gear 323a has a substantially truncated cone shape with its upper surface facing the rotation axis of the differential case 321, and a gear is formed on the side surface of the truncated cone.

[0096] The second bevel gear 323b is accommodated in the accommodating portion 321a of the differential case 321, and is rotatably supported by the differential pinion shaft 322 in a manner opposite to the first bevel gear 323a. The second bevel gear 323b has a substantially truncated cone shape with its upper surface facing the rotation axis of the differential case 321, and a gear is formed on the side of the truncated cone.

[0097] The left side gear 324L is accommodated in the accommodating portion 321a of the differential case 321, and is arranged between the first bevel gear 323a and the second bevel gear 323b on the left side of the differential pinion shaft 322. The rotation axis of the left side gear 324L is coaxial with the rotation axis of the differential case 321. The left side gear 324L has a substantially truncated cone shape with the upper surface facing the differential pinion shaft 322 (i.e., the right direction), and a gear is formed on the side of the truncated cone. Moreover, the left side gear 324L is meshed with both the first bevel gear 323a and the second bevel gear 323b.

[0098] The right side gear 324R is accommodated in the accommodating portion 321a of the differential case 321, and is arranged between the first bevel gear 323a and the second bevel gear 323b on the right side of the differential pinion shaft 322 in a manner that the left side gear 324L is opposite to the differential pinion shaft 322 in the left-right direction. The rotation axis of the right side gear 324R is coaxial with the rotation axis of the differential case 321 and the rotation axis of the left side gear 324L. The right side gear 324R has a substantially truncated cone shape with the upper surface facing the differential pinion shaft 322 (i.e., the left direction), and a gear is formed on the side of the truncated cone. Moreover, the right side gear 324R is meshed with both the first bevel gear 323a and the second bevel gear 323b.

[0099] The left drive shaft 325L passes through the hollow portion of the input shaft 311 of the planetary gear mechanism 31 and the center of the driven sprocket 311a, and extends in the left-right direction coaxially with the rotation axis of the input shaft 311 of the planetary gear mechanism 31 and the rotation axis of the differential case 321. The left drive shaft 325L has a left gear 324L mounted on the right end, and a left rear wheel RW mounted on the left end. Therefore, the left gear 324L, the left drive shaft 325L, and the left rear wheel RW rotate integrally.

[0100] The right drive shaft 325R extends in the left-right direction coaxially with the rotation axis of the input shaft 311 of the planetary gear mechanism 31, the rotation axis of the differential case 321, and the rotation axis of the left drive shaft 325L. The right drive shaft 325R has a right gear 324R mounted on the left end, and a right rear wheel RW mounted on the right end. Therefore, the right gear 324R, the right drive shaft 325R, and the right rear wheel RW rotate integrally.

[0101] Next, a power transmission path of the power output from the driving motor 20 will be described.

[0102] The power generated by the driving motor 20 is output from the driving shaft 21, and the driving sprocket 21a installed on the driving shaft 21 rotates integrally with the driving shaft 21. Moreover, when the driving sprocket 21a rotates, the driven sprocket 311a rotates due to the power transmission chain 40 wound on the driving sprocket 21a and the driven sprocket 311a installed on the input shaft 311 of the planetary gear mechanism 31. Moreover, the input shaft 311 of the planetary gear mechanism 31 rotates integrally with the driven sprocket 311a. At this time, the number of teeth of the driven sprocket 311a is greater than the number of teeth of the driving sprocket 21a, so the rotation of the driving shaft 21 is decelerated via the driving sprocket 21a, the power transmission chain 40 and the driven sprocket 311a, and is input to the input shaft 311 of the planetary gear mechanism 31.

[0103] In the planetary gear mechanism 31, the power input to the input shaft 311 is transmitted to the stepped pinion 314 via the sun gear 312. And, the stepped pinion 314 rotates while revolving. And, the planet carrier 316 rotates integrally with the revolving of the stepped pinion 314. In the planetary gear mechanism 31, since the ring gear 317 is fixed, the rotation of the input shaft 311 is decelerated at a predetermined reduction ratio and transmitted to the planet carrier 316.

[0104] In the differential gear mechanism 32, the differential case 321 is formed integrally with the planetary carrier 316 of the planetary gear mechanism 31, and thus rotates integrally with the rotation of the planetary carrier 316. Therefore, the power input to the input shaft 311 of the planetary gear mechanism 31 is reduced in speed at a predetermined reduction ratio and input to the differential case 321 via the planetary carrier 316.

[0105] Therefore, the power output from the drive shaft 21 is input to the differential case 321 of the differential gear mechanism 32 via the power transmission chain 40 and the planetary gear mechanism 31 , and the differential pinion shaft 322 revolves together with the differential case 321 about the rotation axis of the differential case 321 .

[0106] When the vehicle V is traveling straight, there is no rotation difference between the left and right rear wheels RW, so the left side gear 324L and the right side gear 324R meshing with the first bevel gear 323a and the second bevel gear 323b rotate in accordance with the rotation of the differential pinion shaft 322. In addition, the left drive shaft 325L rotates integrally with the rotation of the left side gear 324L, thereby rotating the left rear wheel RW, and the right drive shaft 325R rotates integrally with the rotation of the right side gear 324R, thereby rotating the right rear wheel RW.

[0107] When the vehicle V turns, the differential pinion shaft 322 revolves, and the first bevel gear 323a and the second bevel gear 323b rotate to slow down the rotation speed of the rear wheel RW on the inner side of the turn and speed up the rotation speed of the rear wheel RW on the outer side of the turn, and the left side gear 324L and the right side gear 324R meshing with the first bevel gear 323a and the second bevel gear 323b rotate at different rotation speeds to slow down the rotation speed of the rear wheel RW on the inner side of the turn and speed up the rotation speed of the rear wheel RW on the outer side of the turn. Moreover, the left drive shaft 325L rotates integrally with the rotation of the left side gear 324L, thereby rotating the rear wheel RW on the left side, and the right drive shaft 325R rotates integrally with the rotation of the right side gear 324R, thereby rotating the rear wheel RW on the right side. Therefore, when the vehicle V turns, the left drive shaft 325L and the right drive shaft 325R rotate in a manner that slows down the rotation speed of the rear wheel RW on the inner side of the turn and speeds up the rotation speed of the rear wheel RW on the outer side of the turn.

[0108] In this way, Figure 3 As shown by the arrow, the power output from the driving motor 20 is decelerated and input into the reduction device 30 via the driving sprocket 21a, the driven sprocket 311a and the power transmission chain 40, further decelerated by the planetary gear mechanism 31, and the power is appropriately distributed and transmitted to the left and right rear wheels RW by the differential gear mechanism 32.

[0109] Next, refer to Figures 5 to 10 The drive unit case 11 will be described.

[0110] The drive unit case 11 includes a main case 111, a left cover 112 covering the left side of the main case 111, and a right cover 113 covering the right side of the main case 111. The main case 111 is divided into a left main case 114 and a right main case 115.

[0111] The main housing 111 is divided into a motor chamber 12 for accommodating a driving motor 20, a gear chamber 13 for accommodating a reduction gear 30, a chain chamber 14 for accommodating a power transmission chain 40, and a controller chamber 15 for accommodating a control device 50. The motor chamber 12 and the gear chamber 13 are arranged in the front-to-back direction with the motor chamber 12 at the front and the gear chamber 13 at the rear. The chain chamber 14 is formed on the left side of the motor chamber 12 and the gear chamber 13 and is open on the left. The controller chamber 15 is formed on the right side of the motor chamber 12 and the gear chamber 13 and is open on the right.

[0112] The left side cover 112 covers the opening on the left side of the chain chamber 14. To the left side surface of the left side cover 112, an oil pump 621 and an oil cooler 63 are fixed.

[0113] like Figures 6 to 8As shown, the left main case 114 forms the motor chamber 12, the gear chamber 13, and the chain chamber 14. The left main case 114 includes a first partition wall 114a that partitions the motor chamber 12 and the chain chamber 14, and a second partition wall 114b that partitions the motor chamber 12 and the gear chamber 13. The first partition wall 114a extends in the up-down direction and the front-rear direction between the drive sprocket 21a and the drive motor 20. The second partition wall 114b extends in the up-down direction and the left-right direction between the drive motor 20 and the reduction gear 30.

[0114] The left main housing 114 has an opening on the right side of the motor chamber 12. In addition, in the left main housing 114, the gear chamber 13 is connected to the chain chamber 14, and a baffle 116 is provided in the left main housing 114 to separate the gear chamber 13 and the chain chamber 14 (see also Figure 4 The baffle plate 116 extends between the driven sprocket 311 a and the sun gear 312 in the up-down direction and the front-rear direction.

[0115] like Fig. 9 and Fig.10 As shown, the right main housing 115 includes a right wall portion 123 covering an opening on the right side of the motor chamber 12 formed in the left main housing 114, and the right main housing 115 also includes a right wall portion 133 covering an opening on the right side of the gear chamber 13 formed in the left main housing 114, and a third partition wall 115a partitioning the motor chamber 12 and the gear chamber 13. In addition, the right main housing 115 forms a controller chamber 15 on the right side of the right wall portion 123 including the front side area of ​​the right wall portion 133. In the right main housing 115, the right side of the controller chamber 15 is open.

[0116] The right side cover 113 covers the opening on the right side of the controller room 15 .

[0117] (Temperature Control System)

[0118] like Fig.11 As shown, a temperature control system 60 is configured in the vehicle V. The temperature control system 60 includes a first temperature control circuit 61 through which the cooling water R1 mentioned above circulates and controls the temperature of the control device 50, a second temperature control circuit 62 through which the motor cooling oil R2 mentioned above circulates and controls the temperature and lubricates the drive motor 20, and the oil cooler 63 mentioned above. As mentioned above, the oil cooler 63 performs heat exchange between the cooling water R1 circulated in the first temperature control circuit 61 and the motor cooling oil R2 circulated in the second temperature control circuit 62.

[0119] In the first temperature control circuit 61, the cooling water R1 circulates through the cooling water pump 612, the control device 50, the oil cooler 63, and the radiator 611. The cooling water R1 pumped under pressure from the cooling water pump 612 is supplied to the control device 50 to control the temperature of the control device 50, supplied from the control device 50 to the oil cooler 63 to perform heat exchange with the motor cooling oil R2 flowing in the second temperature control circuit 62, supplied to the radiator 611, cooled by heat exchange with the outside air, and returned to the cooling water pump 612.

[0120] In the second temperature control circuit 62, the motor cooling oil R2 circulates through the oil pump 621, the drive motor 20, and the oil cooler 63. In addition, a storage portion 622 for temporarily storing the motor cooling oil R2 cooled by the oil cooler 63 is formed inside the drive unit housing 11. The motor cooling oil R2 temporarily stored in the storage portion 622 is pressurized and transported from the oil pump 621, and is supplied to the inside of the drive unit housing 11 to control the temperature of the drive motor 20. Moreover, the motor cooling oil R2 is supplied from the drive unit housing 11 to the oil cooler 63 and is cooled by heat exchange with the cooling water R1 flowing in the first temperature control circuit 61, and then flows into the storage portion 622 and is temporarily stored in the storage portion 622 again.

[0121] In addition, lubricating oil R3 as a common fluid is stored in the gear chamber 13 and the chain chamber 14 separated by the baffle 116. The lubricating oil R3 is, for example, an oil called ATF (Automatic Transmission Fluid). The lubricating oil R3 may be the same oil as the motor cooling oil R2, but it is not mixed with the motor cooling oil R2 circulating in the second temperature control circuit 62. The lubricating oil R3 lubricates the reduction gear 30 provided in the gear chamber 13, the driving sprocket 21a provided in the chain chamber 14, the driven sprocket 311a, and the power transmission chain 40.

[0122] Next, the chain chamber 14 and the lubrication in the chain chamber 14 will be described in more detail.

[0123] like Fig.12 and Fig.13 As shown, the chain chamber 14 is a space formed by assembling the concave portion provided in the left main case 114 and the concave portion provided in the left side cover 112 in a facing manner, and has a front surface 14F, a bottom surface 14D, a rear surface 14B, a top surface 14U, a left side surface 14L, and a right side surface 14R. As described above, the right side surface 14R is formed by the first partition wall 114a of the left main case 114 opened to the left and the baffle 116 that separates the gear chamber 13 and the chain chamber 14, and the left side surface 14L is formed by the left side cover 112 that covers the opening of the left main case 114. The baffle 116 has a disc-like and annular shape, and the input shaft 311 passes through the inside of the baffle 116.

[0124] In the chain chamber 14, as described above, the driving sprocket 21a provided at the left end of the driving shaft 21 is arranged at the front, and the driven sprocket 311a provided at the left end of the input shaft 311 is arranged at the rear, and an annular power transmission chain 40 is wound around the driving sprocket 21a and the driven sprocket 311a.

[0125] Furthermore, a left drive shaft 325L is disposed in the chain chamber 14 so as to pass through the hollow portion of the input shaft 311 and the center of the driven sprocket 311a. Fig.13 As shown, the left drive shaft 325L is supported rotatably by a bearing 73 (radial bearing) provided on the inner peripheral surface of the hollow rear protrusion 112r of the left cover 112, and the left end of the left drive shaft 325L is exposed from the drive unit housing 11. Two bearings 74 and 75 (radial bearings) are arranged side by side on the outer peripheral surface of the rear protrusion 112r of the left cover 112 to support the driven sprocket 311a rotatably. In addition, reference numeral 76 is a bearing (thrust bearing) arranged between the rear protrusion 112r of the left cover 112 and the base of the driven sprocket 311a.

[0126] The drive shaft 21 is provided in the hollow front boss portion 112f of the left side cover 112 (see Figure 2 ) is supported by a bearing 77 (radial bearing) on ​​the inner circumferential surface so as to be freely rotatable.

[0127] The first storage portion 71 capable of storing the lubricating oil R3 is provided on the bottom surface 14D of the chain chamber 14. When the amount of the lubricating oil R3 stored in the first storage portion 71 is large, the stirring loss of the driven sprocket 311a and the power transmission chain 40 immersed in the lubricating oil R3 increases, and therefore the liquid level of the lubricating oil R3 is set to be located below the input shaft 311, preferably below the drive sprocket 21a.

[0128] Therefore, in order to properly lubricate the chain chamber 14, the lubricating fluid must be drawn up with the rotation of the driven sprocket 311a and the power transmission chain 40, and must be stably distributed in the chain chamber 14 even if the rotation of the driven sprocket 311a fluctuates.

[0129] Therefore, the chain chamber 14 is provided with a second reservoir 72 that is located above the input shaft 311 and stores lubricating fluid. In the present embodiment, the second reservoir 72 is formed by the left side surface 14L formed by the left side cover 112 and a guide member 700 that is separate from the left side cover 112.

[0130] The guide member 700 is made of, for example, a resin such as Fig.13 As shown in FIG. 1 , the driven sprocket 311a is disposed on the left side of the driven sprocket 311a in a manner adjacent to the driven sprocket 311a. Fig.12As shown, the guide member 700 includes a bottom portion 701 extending in the rotation axis direction of the driven sprocket 311a, that is, in the left-right direction, and a side portion 702 intersecting the bottom portion 701 and standing and facing the left side 14L of the left cover 112, and the top of the guide member 700 is open. The height of the bottom portion 701 is set to be substantially the same as the height of the uppermost portion of the driven sprocket 311a.

[0131] In this embodiment, if Fig.12 As shown, the bottom surface portion 701 is extended from above the input shaft 311 to above the drive shaft 21 in the front-rear direction. Fig.14 The bottom surface 701 includes a main bottom surface 701m extending in a substantially horizontal direction, a front bottom surface 701f located in front of the main bottom surface 701m and bent downward as it goes forward and extends toward the bearing 77 supporting the drive shaft 21, and a rear bottom surface 701r located behind the main bottom surface 701m and bent downward as it goes backward. The rear bottom surface 701r is formed along the outer peripheral surface of the driven sprocket 311a when viewed from the left-right direction.

[0132] The side surface portion 702 extends upward substantially perpendicularly from the right end portion of the bottom surface portion 701. The bottom surface portion 701 and the side surface portion 702 are provided with fixing portions 703 and 704 for fastening the guide member 700 to the left cover 112 with bolts, respectively.

[0133] Furthermore, a pocket portion 705 is provided at the rear of the rear bottom surface portion 701r. The pocket portion 705 includes a horizontal portion 705a extending substantially horizontally in the rear direction from the rear end portion of the rear bottom surface portion 701r, and a connecting portion 705b located above and opposite to the rear bottom surface portion 701r and formed to connect the rear end portion of the horizontal portion 705a and the side surface portion 702.

[0134] In addition, a cutout 706 is provided at the boundary between the rear bottom surface 701r and the horizontal portion 705a. Figure 1 3, the lubricating oil R3 accumulated in the pocket portion 705 flows through the cutout 706 to the rear communication passage 112b formed in the rear protrusion 112r of the left cover 112 abutting against the cutout 706. The amount of the lubricating oil R3 flowing out of the rear communication passage 112b is substantially less than the amount of the lubricating oil R3 flowing into the pocket portion 705.

[0135] return Fig.14 The horizontal portion 705a has a weir portion 707 formed between the driven sprocket 311a and the driving sprocket 21a when viewed from the left and right directions. The weir portion 707 is lower than the side portion 702 and functions together with the pocket portion 705 to store the lubricating oil R3 on the guide member 700.

[0136] In the chain chamber 14 thus constructed, when the drive shaft 21 and the drive sprocket 21a mounted on the drive shaft 21 rotate integrally by the power generated by the drive motor 20 and the driven sprocket 311a and the power transmission chain 40 rotate accordingly, the lubricating oil R3 stored in the first storage portion 71 is carried up by the driven sprocket 311a and the power transmission chain 40. Fig.12 As shown by the solid arrows, the entrained lubricating oil R3 flows through the rear surface 14B of the chain chamber 14 to the top surface 14U.

[0137] Here, on the top surface 14U, when viewed from the left and right direction, a protrusion 78 extending downward toward the second reservoir 72 is provided on the driving sprocket 21a side (front side) of the pocket portion 705 and on the driven sprocket 311a side (rear side) of the weir portion 707. Therefore, the lubricating oil R3 flowing along the top surface 14U hits the protrusion 78 and falls downward. In addition, the protrusion 78 is formed across the left main case 114 and the left cover 112.

[0138] Since the guide member 700 is present below the projection 78, the lubricating oil R3 is stored in the second reservoir 72 formed by the left cover 112 and the guide member 700. The lubricating oil R3 scattered to the side of the chain chamber 14 is reflected by the left cover 112 and the baffle plate 116 and stored in the second reservoir 72. The movement of the lubricating oil R3 stored in the second reservoir 72 to the drive sprocket 21a side is restricted by the weir portion 707, and thus flows toward the bag portion 705. Fig.13 As shown, the lubricating oil R3 accumulated in the pocket portion 705 flows through the cutout 706 to the rear communication path 112 b formed in the rear boss portion 112 r of the left side cover 112 abutting against the cutout 706 .

[0139] The rear communication passage 112b is communicated with the gap between the inner peripheral surface of the rear boss 112r of the left cover 112 and the left drive shaft 325L. The lubricating oil R3 flowing in the rear communication passage 112b is supplied to the bearings 74, 75, 76 that rotatably support the driven sprocket 311a at the rear boss 112r of the left cover 112. In addition, the lubricating oil R3 flowing in the rear communication passage 112b is supplied to the bearing 73 that rotatably supports the left drive shaft 325L at the rear boss 112r of the left cover 112, and is supplied to the planetary gear mechanism 31 of the gear chamber 13 through the gap between the input shaft 311 and the left drive shaft 325L.

[0140] return Fig.12 When the lubricating oil R3 accumulated in the second storage portion 72 exceeds the weir portion 707, the lubricating oil R3 Fig.12 The lubricating oil R3 flows on the front bottom surface 701f as shown by the dotted arrow in FIG. Figure 2 ) is supplied to a front connecting passage (not shown) formed by the left cover 112 and is supplied to a bearing 77 that supports the drive shaft 21 in a rotatable manner on the front boss portion 112f of the left cover 112.

[0141] In this way, the chain chamber 14 is provided with the first reservoir 71 and the second reservoir 72. The first reservoir 71 is provided on the bottom surface 14D and stores the lubricating oil R3 in a manner that a part of the driven sprocket 311a is immersed therein, and the second reservoir 72 is located above the input shaft 311 and stores the lubricating oil R3. Therefore, the lubricating oil R3 can be stably supplied regardless of the change in the rotation speed of the driven sprocket 311a. Thus, by storing the lubricating oil R3 in the second reservoir 72, it is possible to suppress a decrease in lubrication efficiency due to vibration and other disturbances during running.

[0142] Furthermore, the guide member 700 can be made lighter by separating the guide member 700 from the left side cover 112 and forming the second reservoir 72 with the guide member 700 and the left side cover 112. Furthermore, compared with a case where the second reservoir 72 is formed only by the guide member 700, the shape of the mold for forming the guide member 700 can be simplified, thereby reducing the manufacturing cost.

[0143] Furthermore, the lubricating oil R3 is directly supplied to the bearings 74, 75, 76 that support the driven sprocket 311a so as to be rotatable, and the bearing 77 that supports the drive shaft 21 so as to be rotatable, through the guide component 700. Thus, compared with the case where the lubricating oil R3 is dripped from above, even with a smaller amount of liquid, the decrease in lubrication efficiency caused by vibrations and other disturbances during driving can be suppressed.

[0144] Above, the embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is certainly not limited to the embodiments. Obviously, those skilled in the art can think of various variations or modifications within the scope of the technical solution, and it should be understood that these variations and modifications also belong to the technical scope of the present invention. In addition, the various constituent elements in the above-mentioned embodiments may also be arbitrarily combined within the scope of the gist of the invention.

[0145] As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, and it can make deformation|transformation, improvement, etc. as needed.

[0146] In this specification, at least the following matters are described. In addition, although the corresponding components and the like in the above-mentioned embodiment are shown in brackets, the present invention is not limited thereto.

[0147] (1) A power transmission device (drive unit 10) comprising:

[0148] A first rotating member (driven sprocket 311a);

[0149] a first rotating shaft (input shaft 311 ) that supports the first rotating member; and

[0150] a housing (drive unit housing 11) that rotatably supports the first rotating shaft,

[0151] in,

[0152] The housing comprises:

[0153] a rotating member accommodation chamber (chain chamber 14) which accommodates the first rotating shaft and the first rotating member;

[0154] a first storage portion (first storage portion 71 ) provided at the bottom (bottom surface 14D) of the rotating member accommodation chamber and storing lubricating liquid (lubricating oil R3 ) in a manner that a portion of the first rotating member is immersed; and

[0155] The second reservoir (second reservoir 72 ) is provided above the first rotating shaft in the rotating member accommodation chamber and stores the lubricating fluid.

[0156] According to (1), the second reservoir is provided separately from the first reservoir provided at the bottom, and the lubricating liquid is stored in the second reservoir, thereby enabling the lubricating liquid to be stably supplied regardless of the change in the rotation speed of the first rotating member. Thus, by storing the lubricating liquid in the second reservoir, a decrease in lubrication efficiency due to vibration and other disturbances during driving can be suppressed.

[0157] (2) The power transmission device according to (1), wherein:

[0158] The second reservoir is configured to store the lubricating fluid of the first reservoir that is drawn up by the rotation of the first rotating member.

[0159] According to (2), the lubricating fluid can be supplied to the second storage portion by utilizing the rotation of the first rotating member.

[0160] (3) The power transmission device according to (1), wherein:

[0161] The second storage portion is formed by the side surface of the housing (the left side surface 14L) and a guide member (the guide member 700) which is separate from the housing.

[0162] The guide component has:

[0163] a bottom surface portion (bottom surface portion 701 ) extending along the rotation axis direction of the first rotating member; and

[0164] A side surface portion (side surface portion 702) is arranged to stand upright and intersect with the bottom surface portion and is opposite to the side surface of the housing.

[0165] The guide member has an upper portion opened.

[0166] According to (3), the second reservoir is formed by using the wall surface of the housing, so that the guide member can be made lighter. In addition, compared with the case where the second reservoir is formed only by the guide member, the shape of the mold for forming the guide member can be simplified, thereby reducing manufacturing costs.

[0167] (4) The power transmission device according to (1), wherein:

[0168] The housing includes a communication passage (rear communication passage 112 b ) communicating from the second storage portion to the first lubrication portion of the rotating member accommodating chamber.

[0169] According to (4), the lubricating liquid can be easily supplied to the first lubrication portion.

[0170] (5) The power transmission device according to (4), wherein:

[0171] The first lubrication portion is a region where bearings (bearings 74 , 75 , 76 ) are arranged, and the bearings rotatably support the first rotating member with respect to the housing.

[0172] According to (5), heating and burning of the bearing can be suppressed.

[0173] (6) The power transmission device according to (1), wherein:

[0174] The case includes a protrusion (protrusion 78 ) extending from a wall surface (top surface 14U) located above the second storage portion toward the second storage portion.

[0175] According to (6), although the lubricating liquid in the first reservoir is lifted by the rotation of the first rotating member, if the force is too large, the lubricating liquid will fly over the second reservoir, so by providing a protrusion on the top surface of the housing, the lubricating liquid can be made to fall to the second reservoir. In addition, since the protrusion can be formed integrally on the top surface of the housing, it is possible to form the protrusion inexpensively by casting.

[0176] (7) The power transmission device according to (3), wherein:

[0177] The power transmission device further comprises:

[0178] A second rotating member (driving sprocket 21a); ​​and

[0179] a second rotating shaft (driving shaft 21) extending in parallel with the first rotating shaft and supporting the second rotating member,

[0180] The second storage portion is extended from above the first rotating shaft to above the second rotating shaft.

[0181] The bottom surface portion of the guide member has a weir portion (weir portion 707 ) provided upright between the first rotating member and the second rotating member.

[0182] According to (7), the lubricating fluid can be appropriately stored in the second storage portion.

[0183] (8) The power transmission device according to (7), wherein:

[0184] The height of the weir portion is lower than the height of the side portion,

[0185] The guide member is provided to extend toward a bearing (bearing 77 ) that rotatably supports the second rotating shaft.

[0186] According to (8), the lubricating liquid exceeding the weir portion can be supplied to the bearing that rotatably supports the second rotating shaft. Since the lubricating liquid is not dripped from above the bearing, but the guide member is extended to the second rotating shaft, for example, the lubricating liquid is directly supplied from the guide member through another communication path, even with a small amount of liquid, it is possible to suppress a decrease in lubrication efficiency due to vibration and other disturbances during driving.

[0187] (9) The power transmission device according to (1), wherein:

[0188] The second storage portion is arranged on one side of the first rotating member in the direction of the rotating axis.

[0189] A baffle (baffle 116 ) is provided substantially perpendicularly to the first rotation axis on the other side of the first rotation member in the rotation axis direction.

[0190] The lubricating liquid in the first storage part splashes along the inner wall of the housing due to the rotation of the first rotating member, but the lubricating liquid splashed to the opposite side of the second storage part does not directly enter the second storage part. According to (9), the lubricating liquid can be reflected to the second storage part by the baffle plate, and the lubricating liquid can be efficiently accumulated in the second storage part.

[0191] (10) The power transmission device according to (9), wherein:

[0192] The baffle has a disc-like and annular shape.

[0193] According to (10), the elements of the power transmission device can be arranged so as to pass through the inside of the baffle.

Claims

1. A power transmission device comprising: a first rotating member; a first rotating shaft supporting the first rotating member; and a housing that rotatably supports the first rotating shaft, in, The housing comprises: a rotating component receiving chamber receiving the first rotating shaft and the first rotating component; a first storage portion, which is disposed at the bottom of the rotating member accommodating chamber and stores lubricating liquid in a manner that a portion of the first rotating member is immersed therein; as well as The second storage portion is provided at a position above the first rotating shaft in the rotating member accommodating chamber and stores the lubricating fluid.

2. The power transmission device according to claim 1, wherein: The second reservoir is configured to store the lubricating fluid of the first reservoir that is drawn up by the rotation of the first rotating member.

3. The power transmission device according to claim 1, wherein: The second storage portion is formed by a side surface of the housing and a guide component separate from the housing. The guide component has: a bottom portion extending along the rotation axis direction of the first rotating member; and a side surface portion, which is arranged to stand upright and intersect with the bottom surface portion and is opposite to the side surface of the housing, The guide member has an upper portion opened.

4. The power transmission device according to claim 1, wherein: The housing includes a communication passage that communicates from the second storage portion to the first lubrication portion of the rotating member accommodation chamber.

5. The power transmission device according to claim 4, wherein: The first lubrication portion is a region where a bearing is arranged, the bearing rotatably supporting the first rotating member with respect to the housing.

6. The power transmission device according to claim 1, wherein: The housing includes a protrusion extending from a wall surface located above the second storage portion toward the second storage portion.

7. The power transmission device according to claim 3, wherein: The power transmission device further comprises: a second rotating member; and a second rotating shaft extending in parallel with the first rotating shaft and supporting the second rotating member, The second storage portion is extended from above the first rotating shaft to above the second rotating shaft. The bottom surface portion of the guide member includes a weir portion provided upright between the first rotating member and the second rotating member.

8. The power transmission device according to claim 7, wherein: The height of the weir portion is lower than the height of the side portion, The guide member is extended toward a bearing that rotatably supports the second rotating shaft.

9. The power transmission device according to claim 1, wherein: The second storage portion is arranged on one side of the first rotating member in the direction of the rotating axis. A baffle is provided on the other side of the first rotating member in the direction of the rotating axis and substantially perpendicular to the first rotating axis.

10. The power transmission device according to claim 9, wherein: The baffle has a disc-like and annular shape.

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