DE102022208713A1 - drive device - Google Patents

Abstract

An aspect of a driving device of the present invention includes: a motor having a motor shaft rotating about a first axis line; a power transmission mechanism connected to the motor shaft from one side in an axial direction; a housing having a motor housing portion accommodating the motor therein and a gear accommodating portion accommodating the power transmission mechanism therein; and a fluid passage, at least a portion of which is disposed within the housing. The power transmission mechanism has a hollow shaft with a hollow shape centered on a second axis line parallel to the first axis line. The fluid passage includes a hollow intershaft flow-pass portion provided in the hollow shaft, a supply portion provided at an upper side of the motor, and a relay flow-pass portion connecting the hollow intershaft flow-pass portion and the supply portion.

Description

The present invention relates to a driving device.

In recent years, with the spread of electric vehicles and hybrid vehicles, development of driving devices for driving vehicles has progressed. In such a drive device, a fluid such as oil is stored to lubricate the gear surface or to cool the rotary electric machine. The JP 2020-178520 A discloses a structure in which oil stored in a lower portion in a case shell is pumped up by a pump, flows into a cooling pipe passing through an upper side of an electric motor, and is supplied to the electric motor from a discharge port of the cooling pipe.

In a driving device having a fluid passage for circulating a fluid, when a flow passage length becomes long, a power resistance of the fluid passage increases, and there arises a problem that a pump for supplying a pressurized fluid becomes large or a power consumption of the pump becomes large.

The object of the present invention is to provide a drive device with improved characteristics.

The object is achieved by a drive device according to claim 1.

An aspect of a driving device of the present invention includes: a motor having a motor shaft rotating about a first axis line; a power transmission mechanism connected to the motor shaft from one side in an axial direction; a housing having a motor housing portion accommodating the motor therein and a gear accommodating portion accommodating the power transmission mechanism therein; and a fluid passage, at least a portion of which is disposed within the housing. The power transmission mechanism has a hollow shaft with a hollow shape centered on a second axis line parallel to the first axis line. The fluid passage includes a hollow intershaft flow-pass portion provided in the hollow shaft, a supply portion provided at an upper side of the motor, and a relay flow-pass portion connecting the hollow intershaft flow-pass portion and the supply portion.

According to an aspect of the present invention, there is provided a driving device capable of reducing a line resistance by shortening a fluid passage through which a fluid flows.

• 1 eine schematische Ansicht einer Antriebsvorrichtung gemäß einem ersten Ausführungsbeispiel;
• 2 eine schematische Ansicht einer Antriebsvorrichtung gemäß einem zweiten Ausführungsbeispiel;
• 3 eine schematische Ansicht einer Antriebsvorrichtung gemäß einem dritten Ausführungsbeispiel;

Preferred exemplary embodiments of the present invention are explained in more detail below with reference to the accompanying drawings. Show it:

• 1 a schematic view of a drive device according to a first embodiment;
• 2 a schematic view of a drive device according to a second embodiment;
• 3 a schematic view of a drive device according to a third embodiment;

A drive device according to an embodiment of the present invention will be described in detail below with reference to the drawings.

In the following description, the vertical direction is defined and described based on the positional relationship when a driving device of an embodiment illustrated in each drawing is mounted in a vehicle placed on a horizontal road surface. In the accompanying drawings, an XYZ coordinate system is shown as a three-dimensional orthogonal coordinate system, respectively. In the XYZ coordinate system, a Z-axis direction is the vertical direction. A +Z side is an upper side in the vertical direction, and a -Z side is a lower side in the vertical direction. In the following description, the upper side and the lower side in the vertical direction are simply referred to as the "upper side" and the "lower side", respectively. An X-axis direction is a direction orthogonal to the Z-axis direction and is a front-back direction of a vehicle on which a driving device is mounted. In the following embodiment, a +X side is a front of a vehicle and -X side is a rear of the vehicle. A Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and is a left-right direction of the vehicle, that is, a vehicle width direction. In the following embodiment, a +Y side is a left side of the vehicle and a -Y side is a right side of the vehicle. The front-back direction and the right-left direction are horizontal directions orthogonal to the vertical direction.

The first axis line J1, shown correspondingly in each diagram, extends in the Y-axis direction, that is, the left-right direction of the vehicle. In the following description, unless otherwise specified, a direction parallel to the first axis line J1 is simply referred to as an “axial direction” and a radial direction centered on the first axis line J1 is simply referred to as a “radial direction”. In the following description, the +Y side can be simply referred to as one side in the axial direction, and the -Y side can be simply referred to as the other side in the axial direction.

First embodiment example

1 12 is a schematic diagram of a driving device 1 according to a first embodiment.

The drive device 1 is mounted on a vehicle that uses a motor as a power source, such as a hybrid vehicle (HIV), a plug-in hybrid vehicle (PHV), or an electric vehicle (EV), and is used as the power source.

The driving device 1 comprises a motor 2, a power transmission mechanism 3, a housing 6, a fluid O accommodated inside the housing 6, a fluid passage 90 through which the fluid O flows, a pump 8 and a plurality of bearings 83, 84, 85, 86, 87, 88 and 89.

Housing

The housing 6 includes a motor housing portion 81 accommodating the motor 2 therein, and a gear accommodating portion 82 accommodating the power transmission mechanism 3 therein. The case 6 has a partition wall 6 b that partitions the interior of the motor housing portion 81 and the interior of the gear housing portion 82 . The gear accommodating portion 82 is arranged on one side (+Y side) in the axial direction of the motor housing portion 81 .

The partition wall 6b is provided with a feed through hole 6s, a shaft passage hole 6p, and a partition opening 6q. The supply through hole 6s, the shaft through hole 6p, and the partition hole 6q allow the interiors of the motor housing portion 81 and the gear housing portion 82 to communicate with each other.

The motor case portion 81 includes a motor peripheral wall portion 6g and a motor cover wall portion 6c. The motor peripheral wall portion 6g has a tubular shape extending along the axial direction with the first axis line J1 as a center. The motor peripheral wall portion 6g surrounds the motor 2 from the radially outer side of the first axis line J1. The opening on one side (+Y side) in the axial direction of the motor peripheral wall portion 6g is covered by the partition wall 6b, and the opening on the other side (-Y side) in the axial direction is covered by the motor cover wall portion 6c. The engine cover wall portion 6c extends along a plane orthogonal to the first axis line J1. The motor cover wall portion 6c covers the motor 2 from the other side (-Y side) in the axial direction.

The gear accommodating portion 82 includes a gear peripheral wall portion 6f and a gear cover wall portion 6a. The gear peripheral wall portion 6f has a tubular shape extending along the axial direction. The gear peripheral wall portion 6f surrounds the respective gears 41, 42, 43, and 51 of the power transmission mechanism 3 from the radial outside of the first axis line J1, the second axis line J2, and the third axis line J3, which will be described later. The opening on the other side (-Y side) in the axial direction of the gear peripheral wall portion 6f is covered by the partition wall 6b, and the opening on one side (+Y side) in the axial direction is covered by the gear cover wall portion 6a. The gear cover wall portion 6a extends along a plane orthogonal to the first axis line J1. The gear cover wall portion 6a covers the power transmission mechanism 3 from one side (+Y side) in the axial direction.

The fluid O is accommodated inside the case 6 . The fluid O circulates in the fluid passage 90, which will be described later. In the present embodiment, the fluid O is oil and is used not only for cooling the engine 2 but also for lubricating the power transmission mechanism 3 . An oil equivalent to a lubricating oil (ATF; ATF=Automatic Transmission Fluid) for an automatic transmission with relatively low viscosity is preferably used as the fluid O so that the fluid O can perform functions of a lubricating oil and a cooling oil.

A reservoir P in which the fluid O is stored is provided in a lower region in the gear accommodating portion 82 . The fluid O accumulated in the reservoir P is picked up by the operation of the power transmission mechanism 3 and diffused into the gear accommodating portion 82 . The fluid O diffused into the gear accommodating portion 82 spreads the tooth surfaces of the power transmission mechanism 3 and is used to lubricate the power transmission mechanism 3 . The fluid O in the reservoir P passes through the fluid passage 90 and is supplied to the engine 2 .

engine

In the present embodiment, the motor 2 is an inner rotor motor. The motor 2 of the present embodiment is a three-phase AC motor, for example. The engine 2 has both a function as an electric motor and a function as a generator. The motor 2 comprises a motor shaft 21, a rotor 20 and a stator 25.

The motor shaft 21 extends along the axial direction around the first axis line J1. The motor shaft 21 rotates around the first axis line J1. The motor shaft 21 has a hollow shape. The motor shaft 21 is provided with a hollow portion 22 that extends along the axial direction and is open at both end portions.

The motor shaft 21 has a hollow first shaft portion 21A and a hollow second shaft portion 21B. The first shaft portion 21A and the second shaft portion 21B are arranged coaxially. The first shaft portion 21A and the second shaft portion 21B are connected to each other and synchronously rotate around the first axis line J1.

The first shaft portion 21A is arranged inside the motor housing portion 81 . The rotor 20 is fixed to the outer peripheral surface of the first shaft portion 21A.

The second shaft portion 21B is disposed inside the gear accommodating portion 82 . The power transmission mechanism 3 is connected to the second shaft portion 21B.

The motor shaft 21 extends over the motor case portion 81 and the gear receiving portion 82 of the case 6. The motor shaft 21 passes through the shaft through hole 6p of the partition wall 6b. A connection portion between the first shaft portion 21A and the second shaft portion 21B is located inside the shaft passage hole 6p.

The rotor 20 is rotatable about the first axis line J1. The rotor 20 includes a rotor core and a rotor magnet fixed to the rotor core. The torque of the rotor 20 is transmitted to the power transmission mechanism 3 .

The stator 25 surrounds the rotor 20 from the radially outer side. The stator 25 includes a stator core, a coil attached to the stator core, and an insulator (not shown) interposed between the stator core and the coil. The stator 25 is held by the case 6 . The stator core has a plurality of magnetic pole teeth (not shown) projecting radially inward from the inner peripheral surface of the annular yoke. A coil wire is placed between the magnetic pole teeth. The coil wire, which is in the space between the adjacent magnetic pole teeth, forms a coil. The insulator is made of an insulating material.

Performance transference mechanism

The power transmission mechanism 3 transmits the power of the engine 2 to an output shaft 55 through the plurality of transmission gears 41, 42, 43 and 51. The power transmission mechanism 3 is connected to the engine shaft 21 from one side (+Y side) in the axial direction. The power transmission mechanism 3 includes a reduction device 4 and a differential device 5.

The reduction device 4 has a function of increasing the torque output from the motor 2 according to a reduction ratio by reducing the rotational speed of the motor 2. The reduction device 4 is arranged to reduce the torque output from the motor 2 to the transfer differential device.

The reduction device 4 includes a pinion gear 41 , a hollow shaft 45 , and a counter gear 42 and a drive gear 43 fixed to the hollow shaft 45 . That is, the power transmission mechanism 3 includes the plurality of gears 41, 42 and 43 and the hollow shaft 45. The torque output from the motor 2 is transmitted through the motor shaft 21, the pinion gear 41, the counter gear 42 and the drive gear 43 of the Motor 2 transmitted to a ring gear 51 of the differential device 5. The number of gears, the gear ratios of the gears, etc. can be modified in various ways according to a desired reduction ratio.

The pinion gear 41 is fixed to the outer peripheral surface of the motor shaft 21 of the motor 2 . The pinion gear 41 rotates together with the motor shaft 21 around the first axis line J1.

The hollow shaft 45 extends along the second axis line J2 parallel to the first axis line J1. That is, the hollow shaft 45 is centered on the second axis line J2. In the present embodiment, the second axis line J2 is located above the first axis line J1. Therefore, the hollow shaft 45 is above the motor shaft 21. The hollow shaft 45 rotates around the second axis line J2. The hollow shaft 45 has a hollow shape. The hollow shaft 45 is provided with a hollow portion 46 extending along the axial direction and open at both end portions.

The counter gear 42 and the drive gear 43 are arranged side by side in the axial direction. The counter gear 42 and the drive gear 43 are provided on the outer peripheral surface of the hollow shaft 45 . The counter gear 42 and the driving gear 43 are connected via the hollow shaft 45 . The counter gear 42 and the drive gear 43 rotate around the second axis line J2. At least two of the counter gear 42, the driving gear 43 and the sleeve shaft 45 may be formed of a single member. The counter gear 42 meshes with the pinion gear 41 . The drive gear 43 meshes with the ring gear 51 of the differential device 5 .

The differential device 5 is a device arranged to transmit the torque output from the engine 2 to wheels of the vehicle. The differential device 5 has a function of transmitting torque to the pair of output shafts 55 while absorbing a difference in speed between the left and right wheels when the vehicle is turning.

The differential device 5 includes a ring gear (pick-up gear) 51. The ring gear 51 rotates about the third axis line J3 parallel to the first axis line J1. The torque output from the motor 2 is transmitted to the ring gear 51 through the reduction device 4 .

The pair of output shafts 55 extend along the axial direction. A side gear is connected to one end of each of the pair of output shafts 55 and one wheel is connected to the other end. The pair of output shafts 55 transmits the torque of the engine 2 to the road surface via the wheels.

In the present embodiment, the ring gear 51 has a larger diameter than other gears. At least part of the ring gear 51 is submerged in the reservoir P. Therefore, the power transmission mechanism 3 takes up the fluid O in the reservoir P in the ring gear 51 at the time of driving.

camp

The plurality of bearings 83, 84, 85, 86, 87, 88 and 89 are supported by the housing 6 and each of them rotatably supports one of the motor shaft 21, the hollow shaft 45 and the output shaft 55.

In the bearings 83 and 84 supporting the hollow shaft 45, one bearing 83 is held by the gear cover wall portion 6a and the other bearing 84 is held by the partition wall 6b. Similarly, one of the bearings 89 supporting the output shaft 55 is held by the gear cover wall portion 6a and the other is held by the partition wall 6b (not shown).

In the bearings 87 and 88 supporting the first shaft portion 21a of the motor shaft 21, one bearing 87 is supported by the partition wall 6b and the other bearing 88 is supported by the motor cover wall portion 6c. In the bearings 85 and 86 supporting the second shaft portion 21B of the motor shaft 21, one bearing 85 is held by the gear cover wall portion 6a and the other bearing 86 is held by the partition wall 6b. The bearing 86 and the bearing 87 are arranged inside the shaft passage hole 6p provided in the partition wall 6b.

The gear cover wall portion 6a includes a first bearing holding portion 61 which holds the bearing 83 and a second bearing holding portion 62 which holds the bearing 85 . The partition wall 6b includes a third bearing holding portion 63 which holds the bearing 84. As shown in FIG. The engine cover wall portion 6c includes a fourth bearing holding portion 64 which holds the bearing 88. As shown in FIG. The first bearing holding portion 61 and the third bearing holding portion 83 have a cylindrical shape centered on the second axis line J2. The second bearing holding portion 62 and the fourth bearing holding portion 64 have a cylindrical shape centered on the first axis line J1. The supply through hole 6s opens in the third bearing holding portion 63. That is, the supply through hole 6s of the partition wall 6b opens to the inside of the gear accommodating portion 82 in the third bearing holding portion 63.

fluid flow

The fluid O circulates in the fluid passage 90 in the driving device 1. The fluid passage 90 is a passage for supplying the fluid O from the reservoir P to the motor 2 and returning the fluid O to the reservoir P again.

In the present description, the “fluid passage” means a passage of the fluid O circulating in the case 6 . Therefore, the "fluid passage" is a concept that includes not only a "flow passage" constantly forming a continuous flow of fluid in one direction, but also a passage (such as a reservoir) for temporarily holding the fluid, a passage in which the fluid drips and a passage in which the fluid scatters.

A pump 8 is provided in the path of the fluid passage 90 . The pump 8 pumps the fluid O in the fluid passage 90. The pump 8 is fixed to the outer surface of the gear accommodating portion 82. As shown in FIG. The pump 8 pumps the fluid O into the path of the fluid passage 90. The pump 8 may be an electric pump that is electrically driven or a mechanical pump that operates according to the power transmission mechanism 3 drive.

The fluid passage 90 may further include a cooler that cools the fluid O . As a result, the engine 2 can be efficiently cooled via the fluid O. The cooler may be provided in the reservoir P to cool the fluid O accumulated in the reservoir P.

The fluid passage 90 of the present embodiment includes a first flow passage portion 95, a hollow intershaft flow passage portion 91, a relay flow passage portion 94, a supply pipe portion (supply portion) 92, a second flow passage portion 97, and an inter-motor shaft flow passage portion 96.

The first flow-passage section 95 connects the reservoir P with the hollow inter-shaft flow-passage section 91 and the inter-motor shaft flow-passage section 96. The first flow-passage section 95 directs the fluid O accumulated in the reservoir P to the hollow inter-shaft flow-passage section 91 and the inter-motor shaft flow-passage section 96.

The first flow passage portion 95 is a hole provided in the gear cover wall portion 6a. That is, the first flow passage portion 95 is arranged inside the gear cover wall portion 6a. The first flow passage portion 95 extends along the wall surface of the gear cover wall portion 6a.

The first flow-pass portion 95 includes a main flow-pass 95c, and a first branch path 95a and a second branch path 95b branching from the main flow-pass 95c. The main flow-passage 95 c is provided in a region on the upstream side of the first flow-passage portion 95 . The upstream end portion of the main flow passage 95c opens to the reservoir P.

The first branch path 95a connects the downstream end portion of the main flow passage 95c and the end portion of the hollow intermediate shaft flow passage portion 91. The downstream end portion of the first branch path 95a opens in the first bearing holding portion 61. The first bearing holding portion 61 supports the hollow shaft 45 via the bearing 83. The hollow portion 46 of the hollow shaft 45 opens in the first bearing holding portion 61. The fluid O flows from the first branch path 95a into the first bearing holding portion 61 and further flows into the hollow intershaft flow passage portion 91 of the hollow shaft 45. The fluid O is supplied to the bearing 83 to the bearing 83 to lubricate when passing through the interior of the first bearing holding portion 61 .

The second branch path 95b connects the downstream end portion of the main flow passage 95c and the end portion of the inter-motor shaft flow passage portion 96. The downstream end portion of the second branch path 95b opens in the second bearing holding portion 62. The second bearing holding portion 62 supports the motor shaft 21 via the bearing 85. The hollow portion 22 of the motor shaft 21 opens in the second bearing holding portion 62. The fluid O flows from the second branch path 95b into the second bearing holding portion 62 and further flows into the inter-motor shaft flow passage portion 96 of the motor shaft 21. The fluid O is supplied to the bearing 85 to close the bearing 85 lubricate when passing through the interior of the second bearing holding portion 62.

In the present embodiment, the pump 8 is arranged in the main flow-pass 95 c of the first flow-pass section 95 . The pump 8 is provided in a flow passage connecting the reservoir P and the inter-shaft hollow flow-pass portion 91, and sends the fluid O from the reservoir P to the inter-shaft hollow flow-pass portion 91. The pump 8 is provided in a flow passage connecting the reservoir P and the inter-motor shaft flow-pass portion 96 connects and sends that Fluid O from the reservoir P to the inter-motor shaft flow-pass portion 96. According to the present embodiment, by providing the pump 8 in the main flow-pass 95c located on the downstream side of the first branch path 95a and the second branch path 95b, the fluid O can flow to the flow-passes (the hollow Inter-shaft flow-passing section 91 and the inter-motor shaft flow-passing section 96) in the two shafts are supplied by a pump 8.

The hollow intershaft flow passage portion 91 is provided in the hollow shaft 45 . The intershaft hollow flow passage portion 91 is a flow passage that passes through the hollow portion 46 of the hollow shaft 45 . The hollow intershaft flow passage portion 91 guides the fluid O from the end portion on one side (+Y side) in the axial direction of the gear housing portion 82 to the end portion on the other side (-Y side) in the axial direction.

The relayed flow-passage portion 94 connects the hollow intershaft flow-passage portion 91 and the supply pipe portion 92. The relayed flow-passage portion 94 is a flow-passage provided in the supply through hole 6s of the partition wall 6b. Therefore, the relay flow-passage portion 94 linearly extends along the axial direction inside the partition wall 6b.

The upstream end portion of the relay flow passage portion 94 opens in the third bearing holding portion 63. The third bearing holding portion 63 supports the hollow shaft 45 via the bearing 84. The hollow portion 46 of the hollow shaft 45 opens in the third bearing holding portion 63. The fluid O flows from the hollow intershaft flow passage portion The fluid O is supplied to the bearing 84 to lubricate the bearing 84 when the same passes through the interior of the third bearing holding portion 63 .

The downstream end portion of the relay flow passage portion 94 opens to an upper region in the motor housing portion 81. The end portion on one side (+Y side) in the axial direction of the feed pipe portion 92 is inserted into the opening at the downstream end portion of the relay flow passage portion 94. Therefore, the fluid O flowing through the relay flow-passage portion 94 flows into the inside of the feed pipe portion 92 at the downstream end portion of the relay flow-passage portion .94.

The feed pipe portion 92 extends along the axial direction inside the motor housing portion 81. The end portion on one side (+Y side) in the axial direction of the feed pipe portion 92 is supported by the partition wall 6b, and the end portion on the other side (-Y side ) in the axial direction is supported by the motor cover wall portion 6c.

The supply pipe portion 92 is arranged on the upper side of the motor 2 inside the motor housing portion 81 . The supply pipe portion 92 is provided with an injection hole 92h opening to the engine 2 side. The fluid O passing through the supply pipe portion 92 is injected to the engine 2 from the injection hole 92h provided in the supply pipe portion 92 . As a result, the supply pipe portion 92 supplies the fluid O from the outside of the engine 2 to the engine 2 .

The feed tube portion 92 of the present embodiment has a tubular shape. Therefore, by pumping the fluid O to the supply pipe portion 92 using the pump 8, the pressure of the fluid O in the supply pipe portion 92 can be increased and the fluid O can be discharged to the engine 2. As a result, the fluid O can reach the complicated portion 46 of the engine 2 to cool the engine 2 efficiently.

The fluid O supplied from the outside to the motor 2 through the supply pipe portion 92 absorbs heat from the stator 25 at the time of transferring the surface of the stator 25 and cools the stator 25. Further, the fluid O drips from the stator 25, reaches the lower region in the motor housing portion 81 and returns to the reservoir P via the partition opening 6q.

The second flow-passage portion 97 connects the supply pipe portion 92 and the inter-motor shaft flow-passage portion 96. The second flow-passage portion 97 is a hole provided in the motor cover wall portion 6c. That is, the second flow passage portion 97 is arranged inside the motor cover wall portion 6c. The second flow passage portion 97 extends along the wall surface of the motor cover wall portion 6c.

The upstream end portion of the second flow passage portion 97 opens to an upper region in the motor housing portion 81. The end portion on the other side (-Y side) in the axial direction of the supply pipe portion 92 is inserted into the opening at the upstream end portion of the second flow passage portion 97. A part of the fluid O, which is inside the supply from section 92 flows into the second flow passage section 97.

The downstream end portion of the second flow passage portion 97 opens in the fourth bearing holding portion 64. The fourth bearing holding portion 64 supports the motor shaft 21 via the bearing 88. The hollow portion 22 of the motor shaft 21 opens in the fourth bearing holding portion 64. The fluid O flows from the second Flow passage section 97 into the fourth bearing holding section 64 and further flows into the inter-motor shaft flow passage section 96 of the motor shaft 21. The fluid O is supplied to the bearing 88 to lubricate the bearing 88 when passing through the interior of the fourth bearing holding section 64.

The inter-motor shaft flux passage portion 96 is a passage that passes through the hollow portion 22 of the motor shaft 21 . That is, the inter-motor shaft flux passage portion 96 is provided in the motor shaft 21 . in the inter-motor shaft flow-passing section 96, the fluid O flows along the axial direction. The first flux-passage portion 95 and the second flux-passage portion 97 are connected to the inter-motor shaft flux-passage portion 96 . The fluid O flowing into the hollow portion 22 of the motor shaft 21 from one side and the other side in the axial direction mixes at the inter-motor shaft flow passage portion 96.

A centrifugal force accompanying the rotation of the rotor 2 is applied to the fluid O passing through the inter-motor shaft flow-passing portion 96 , and the fluid O passes through the rotor 20 radially outward, scatters radially outward, and is supplied to the stator 25 . The fluid O absorbs heat from the rotor 20 as it passes through the rotor 2 to cool the rotor 20 . Further, the fluid O supplied to the stator 25 from the radially inner side absorbs heat from the stator 25 when the surface of the stator 25 is transferred and cools the stator 25 from inside.

According to the present embodiment, part of the fluid O stored in the reservoir P cools the motor 2 from the outside via the supply pipe portion 92 and cools the motor 2 from the inside via the inter-motor shaft flow passage portion 96 . That is, according to the present embodiment, the inside and outside of the engine 2 can be cooled using the fluid O, and the cooling efficiency of the engine 2 can be improved.

Part of the fluid O passing through the inter-motor shaft flow passage portion 96 leaks from the clearance of the connecting portion between the first shaft portion 21A and the second shaft portion 21B to the outside of the motor shaft 21. The connecting portion between the first shaft portion 21A and the second shaft portion 21B is in the Arranged inside the shaft passage hole 6p of the partition wall 6b. The fluid O leaked to the outside of the motor shaft 21 is supplied to the bearings 86 and 87 disposed inside the shaft through hole 6p of the partition wall 6b to lubricate the bearings 86 and 87.

In the present embodiment, a configuration in which one of the second branch path 95b and the second flow-passing section 97 is omitted can be adopted. That is, in the present embodiment, a configuration in which the fluid O is supplied to the inter-motor shaft flow-passing portion 96 only from one side or the other side in the axial direction can be adopted.

According to the present embodiment, the fluid passage 90 has the hollow intershaft flow passage portion 91 passing through the inside of the hollow shaft 45 . The hollow intermediate shaft flow passage portion 91 linearly crosses the interior of the gear receiving portion 82. Therefore, according to the present embodiment, a part of the fluid passage 90 that reaches the supply pipe portion 92 from the reservoir P can be configured to be short or linear and the line resistance in the fluid passage 90 can be suppressed. As a result, the pump 8 can be downsized, and the power consumption of the pump 8 can be reduced.

According to the present embodiment, since a part of the fluid passage 90 is provided inside the hollow shaft 45, the processing cost of the housing 6 can be reduced compared to a case where the flow passage from the discharge port of the pump to the supply pipe portion only through the hole in the Wall of the housing is formed and the drive device 1 can be provided at low cost.

According to the present embodiment, since part of the fluid passage 90 is provided in the interior of the hollow shaft 45 , the fluid O can be supplied to the bearings 83 and 84 supporting both end portions of the hollow shaft 45 . Therefore, the bearings 83 and 84 can be lubricated by the fluid O without separately providing an oil supply path.

According to the present embodiment, the second axis line J2, which is the The center of the hollow shaft 45 is above the first axis line J1 which is the center of the motor 2. Therefore, the hollow shaft 45 can be easily located close to the feed pipe portion 92 on the upper side of the motor 2, and the relay flow-passage portion 94 connecting the hollow inter-shaft flow-passage portion 91 and the feed pipe portion 92 can be shortened. This makes it possible to suppress the conduction resistance of the fluid passage 90 from the hollow intershaft flow passage portion 91 to the supply pipe portion 92 .

According to the present embodiment, since the center of the hollow shaft 45 is above the first axis line J1, the hollow shaft 45 can be located away from the oil surface of the reservoir P. As a result, it is less likely that the counter gear 42 and the drive gear 42 provided on the outer peripheral surface of the hollow shaft 45 are immersed in the fluid O in the reservoir P and it is possible to apply the stirring resistance of the fluid O when the counter gear 42 and the drive gear 43 rotate.

In the present embodiment, the supply pipe portion 92 is arranged on the second axis line J2. According to the present embodiment, the hollow intershaft flow-passage portion 91 and the feed pipe portion 92 may be linearly arranged along the second axis line J2. Therefore, the hollow intershaft flow-passage portion 91, the relay flow-passage portion 94 and the feed pipe portion 92 can be linearly configured, the flow passage length can be shortened, and the conduction resistance of the fluid passage 90 from the hollow intershaft flow-passage portion 91 to the feed pipe portion 92 can be suppressed.

The hollow portion 46 of the hollow shaft 45 of the present embodiment has a uniform cross-sectional shape (a circular shape in the present embodiment) and extends along the axial direction. Therefore, the hollow intershaft flow-passing portion 91 of the present embodiment has a uniform flow-passing cross-sectional area over the entire length. Similarly, the supply through hole 6s of the present embodiment has a uniform cross-sectional shape (a circular shape in the present embodiment) and extends along the axial direction. Therefore, the relay flow-passage section 94 of the present embodiment has a uniform flow-passage cross-sectional area over the entire length.

In the present embodiment, a flow passage cross-sectional area S2 of the relay flow-pass portion 94 is smaller than a flow passage cross-sectional area S1 of the hollow intershaft flow-pass portion 91. According to the present embodiment, the flow speed of the fluid O is increased when the fluid O flows from the hollow intershaft flow-pass portion 91 into the relay flow-pass portion 94. As a result, the pressure of the fluid O in the supply pipe section 92 located on the downstream side of the relay flow passage section 94 can be increased, the fluid O can be forcefully injected from the injection hole 92h of the supply pipe section 92, and the fluid O can fill the deep portion of the reach engine 2.

Second embodiment

2 12 is a schematic diagram of a driving device 101 according to a second embodiment.

The driving device 101 of the present embodiment differs from that of the first embodiment mainly in the configuration of a fluid passage 190 and a receiver 193.

In the description of each of the embodiments described below, the same components as those of the embodiment already described are given the same reference numerals and the descriptions thereof will be omitted.

In the present embodiment, the reservoir 193 is provided inside the gear accommodating portion 82 . The catch tank 193 opens upward and stores the fluid O. The catch tank 193 is provided above the second axis line J2.

Here, “the receiver 193 is provided above the second axis line J2” means that the lower portion of the receiver 193 is positioned above the second axis line J2.

The catch tank 193 is, for example, a groove member protruding from the inner surface of the gear accommodating portion 82 . In this case, the receiver 193 is a part of the housing 6. The receiver 193 may also be a member separate from the housing 6.

The catch tank 193 acts as a reservoir that stores the fluid O . Therefore, the reservoir, which is provided inside the housing 6, includes the catch tank 193, which is above the Reservoir P is arranged in the gear accommodating portion 82 in addition to the reservoir P provided in the lower region in the gear accommodating portion 82 .

The fluid passage 190 of the present embodiment includes a pickup flow passage 198, a first flow passage section 195, a hollow intershaft flow passage section 91, a relay flow passage section 94, a feed trough section (feed section) 192, a communication flow passage section 199, and an intermotor shaft flow passage section 96.

The pickup flow passage 198 is a passage that pickups the fluid 8 by the rotation of the gear (the ring gear 51 in the present embodiment) of the power transmission mechanism 3 and guides the fluid O to the catch tank 193 . That is, in the fluid passage 190 of the present embodiment, the fluid O is supplied from the reservoir P to the catch tank 193 by being picked up by the gear of the power transmission mechanism 3 .

In the present embodiment, the reservoir to which the first flow-passage section 195 is connected is the surge tank 193. The first flow-passage section 195 connects the surge tank 193 and the hollow intershaft flow-passage section 91. The first flow-passage section 195 connects the surge tank 193 and the communication flow-passage section 199. The first Flow-passage section 195 directs the fluid O from the surge tank 193 to the hollow intershaft flow-passage section 91 and the communication flow-passage section 199.

The communication flow passage portion 199 connects the first flow passage portion 195 and the inter-motor shaft flow passage portion 96. The communication flow passage portion 199 is a hole provided in the gear cover wall portion 6a. That is, the communication flow passage portion 199 is arranged in the interior of the gear cover wall portion 6a. The communication flow passage portion 199 extends along the wall surface of the gear cover wall portion 6a.

The downstream end portion of the first flow passage portion 195 opens in the first bearing holding portion 61. The hollow portion 46 of the hollow shaft 45 opens in the first bearing holding portion 61. Further, the upstream end portion of the communication flow passage portion 199 opens in the first bearing holding portion 61. The fluid O flows from first flow-passage portion 195 into the first bearing holding portion 61, and further branches and flows into the hollow intershaft flow-passage portion 91 and the communication flow-passage portion 199. The fluid O is supplied to the bearing 83 to lubricate the bearing 83 when the same passes through the interior of the first bearing holding portion 61 runs.

The downstream end portion of the communication flow passage section 199 opens in the second bearing holding section 62. The hollow section 22 of the motor shaft 21 opens in the second bearing holding section 62. The fluid O flows from the communication flow passage section 199 into the second bearing holding section 62 and further flows into the inter-motor shaft flow passage section 96. The fluid O is supplied to the bearing 85 to lubricate the bearing 85 when passing through the interior of the second bearing holding portion 62 .

The feed chute portion 192 is a chute-shaped member provided inside the motor housing portion 81 . The supply chute portion 192 is connected to the downstream side of the relay flow passage portion 94 . The feed chute portion 192 extends along the axial direction. The feed chute portion 192 is located directly above the engine 2. As shown in FIG. A lower portion of the supply chute portion 192 is provided with a through hole 192 for supplying the fluid O to the engine 2 . The supply chute portion 192 of the present embodiment drops the fluid O stored therein from the through hole 192h at the lower portion to the motor 2.

In this description, “directly above” means that they are arranged so that they overlap when viewed from above and the up-down direction.

In the present embodiment, the supply chute portion 192 has a chute shape and supplies the fluid O stored therein to the motor 2 by dripping from the through hole 192 . Therefore, according to the supply chute portion 192 of the present embodiment, even if the supply of the fluid O from the reservoir P to the supply chute portion 192 is delayed, the fluid O stored in the supply chute portion 192 can be gradually supplied to the engine 2 for a long time become. Therefore, even if the supply of the fluid O from the reservoir P to the supply chute portion 192 is delayed, the engine 2 can be cooled for a long time.

According to the present embodiment, the catch box 193 is positioned above the second axis line J2. Therefore, the fluid O in the catch tank 193 is supplied to the hollow inter-shaft flow-pass portion 91 and the inter-motor-shaft flow-pass portion 96 using gravity. Therefore, as shown in the present embodiment, when the pump 8 is provided in the first flow passage portion 195, the power consumption of the pump 8 can be reduced. Further, by adopting the fluid passage 190 of the present embodiment, the fluid O in the catch tank 193 can be supplied to the hollow inter-shaft flow-pass portion 91 and the inter-motor-shaft flow-pass portion 96 using gravity. Therefore, in the present embodiment, the configuration excluding the pump 8 of the first flow-passage portion 195 can be adopted, and the inexpensive driving device 101 can be provided.

According to the present embodiment, part of the fluid O stored in the reservoir P is transferred to the catch tank 193 and stored by being picked up by the power transmission mechanism 3. Therefore, the liquid level of the fluid O accumulated in the reservoir P can be reduced can be suppressed, and the pipe resistance of the gear immersed in the fluid O in the reservoir P can be suppressed.

Third embodiment

3 12 is a schematic diagram of a driving device 201 according to a third embodiment.

The driving device 201 of the present embodiment differs from that of the first embodiment mainly in the configuration of a fluid passage 290.

The fluid passage 290 of the present embodiment includes a first flow passage portion 295, a hollow intershaft flow passage portion 91, a relay flow passage portion 94 and a supply pipe portion 92. The fluid passage 290 of the present embodiment does not include the second flow passage portion 97 and the inter-motor shaft flow passage portion 96 as compared to the embodiment described above .

The first flow-passage portion 295 of the present embodiment connects the reservoir P and the hollow intershaft flow-passage portion 91. The first flow-passage portion 295 guides the fluid O accumulated in the reservoir P to the hollow intershaft flow-passage portion 91. The first flow-passage portion 295 is a hole that is provided in the gear cover wall portion 6a. That is, the first flow passage portion 295 is arranged inside the gear cover wall portion 6a. The first flow passage portion 295 extends along the wall surface of the gear cover wall portion 6a.

As in the embodiment described above, the fluid passage 290 according to the present embodiment linearly crosses the internal space of the gear accommodating portion 82 in the hollow intershaft flow passage portion 91. Therefore, the fluid passage 290 can be shortened to suppress conduction resistance.

The fluid passage 90, 190 does not necessarily have the supply pipe portion (supply portion) 92, 192 in the above embodiment. In this case, the motor housing section 81 may have at least one cavity in a side wall, i.e. the feed section may have at least one cavity. The cavity extends along the axial direction above the motor 2 in the side wall of the motor housing section 81. The fluid passage 90, 190 extends into the interior of the side wall of the motor housing section 81. The side wall of the motor housing section 81 has at least one injection port connected to the cavity .

The relay flow-passage portion 94 connects the hollow intershaft flow-passage portion 91 and the cavity. The side wall of the motor housing portion 81 has at least one injection hole communicating with the cavity and opening to the motor 2 side. The fluid O passing through the cavity is injected toward the motor 2 from the injection hole provided in the side wall of the motor housing portion 81 . Consequently, the side wall supplies the liquid O to the motor 2 from the outside of the motor 2 .

Although various embodiments of the present invention are described above, configurations in the embodiments and a combination of the configurations are examples, and thus addition, omission, substitution of a configuration, and other modifications can be made within a range that does not depart from the spirit of the present invention. Furthermore, the present invention is not limited by the embodiments.

Reference List

1, 101, 201

drive device

2

engine

3

power transmission mechanism

6

Housing

6b

partition wall

6c

engine bulkhead section

8th

pump

21

motor shaft

41

gear wheel

45

hollow shaft

81

engine case section

82

Gear Receptacle Section

90, 190, 290

fluid flow

91

hollow intershaft flow passage section

92

feed pipe section (feed section)

94

forward flow passage section

95, 195, 295

first river pass section

96

Intermotor Shaft Flow Pass Section

97

second river pass section

192

feed chute section (feed section)

193

collection container (reservoir)

198

pass

J1

first axis line

J2

second axis line

O

Fluid

P

reservoir

S1, S2

flow passage cross-sectional area

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• JP2020178520A [0002]

Claims (9)

Drive device (1), which has the following features: a motor (2) having a motor shaft (21) rotating about a first axis line (J1); a power transmission mechanism (3) connected to the motor shaft (21) from one side in an axial direction; a housing (6) having a motor housing portion (81) accommodating the motor (2) therein and a gear accommodating portion (82) accommodating the power transmission mechanism (3) therein; and a fluid passageway (90) at least partially disposed within said housing (6), wherein the power transmission mechanism (3) comprises a hollow shaft (45) having a hollow shape centered on a second axis line (J2) parallel to the first axis line (J1), and the fluid passage (90) includes the following features: a hollow intershaft flow passage portion (91) provided in the hollow shaft (45); a feed section (92) provided on an upper side of the engine (2); and a relay flow-pass section (94) connecting the hollow intershaft flow-pass section (91) and the feed section (92). Drive device (1) according to claim 1 , in which the second axis line (J2) is located above the first axis line (J1). Drive device (1) according to claim 1 or 2 , in which the feeding section (92) is arranged on the second axis line (J2). Drive device (1) according to one of Claims 1 until 3 Having the following features: a pump (8) provided in a path of the fluid passage (90), wherein a reservoir (P) is provided in the gear accommodating portion (82) and the pump (8) is provided in a flow passage, connecting the reservoir (P) and the hollow intershaft flow passage section (91). Drive device (1) according to one of Claims 1 until 3 wherein a reservoir (P) provided above the second axis line (J2) is provided in the gear accommodating portion (82), and the fluid passage (90) is provided with a first flow passage portion connecting the reservoir (P) and the hollow Intershaft flow passage section (91) connects. Drive device (1) according to one of Claims 1 until 5 wherein the motor shaft (21) has a hollow shape, the motor housing portion (81) includes a motor cover wall covering the motor (2) from another side in the axial direction, the fluid passage (90) includes: an inter-motor shaft flow passage portion (96 ) provided in the motor shaft (21); and a second flow passage portion connecting the supply portion (92) and the inter-motor shaft flow passage portion (96), and the second flow passage portion is disposed in an interior of the motor cover wall. Drive device (1) according to one of Claims 1 until 6 wherein the housing (6) has a partition wall partitioning the motor housing portion (81) and the gear housing portion (82), the relay flow-passage portion (94) is provided in the partition wall, and a flow passage cross-sectional area of the relay flow-passage portion (94) is smaller than a flow passage cross-sectional area of the hollow intershaft flow passage section (91). Drive device (1) according to one of Claims 1 until 7 wherein the supply portion (92) has a tubular shape. Drive device (1) according to one of Claims 1 until 7 wherein the feed portion (92) has a trough shape.

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