Lubrication structure of power transmission device

Abstract

To provide a lubrication structure of a power transmission device which can supply a lubrication oil to a first rotation member positioned at a high place with a simple configuration.SOLUTION: A lubrication structure of a transmission 1 includes: a transmission case 2 in which a lubrication oil O is stored at the bottom thereof and which stores a first rotation member 4, a second rotation member 5, and a third rotation member 6; and a catch tank 21 which is stored in the transmission case 2 and in which the lubrication oil is stored. The catch tank 21 includes: an opening 21a in which the lubrication oil stirred by the second rotation member 5 positioned at the top is introduced; and a movable plate 22 which forms an upper storage 21A in which a lubrication oil O1 is stored only at the upper part of the catch tank 21 below the opening 21a. The third rotation member 6 arranged at a height position between the first rotation member 4 and the second rotation member 5 supplies the lubrication oil O1 stored in the upper storage 21A to the first rotation member 4 positioned at the top.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lubrication structure for a power transmission device. [Background technology]

[0002] In a vehicle transmission, lubricating oil stored in the bottom of a transmission case is scooped up by the rotation of the final gear and supplied to the gears and bearings, thereby lubricating the gears and bearings.

[0003] In hybrid vehicles, the motor shaft is placed at a high position and power is transmitted from the motor shaft to the differential device via gears arranged vertically, and it is necessary to lubricate the gears and bearings of the input shaft connected to the motor shaft, which rotates at high speed.

[0004] In cases where the lubricating oil scooped up by the final gear has difficulty reaching the gears and bearings of the input shaft located at a high altitude, the lubricating oil discharged from the oil pump is supplied to the gears and bearings of the input shaft located at a high altitude.

[0005] However, using an oil pump increases the number of parts in the transmission and increases the manufacturing costs of the transmission, so supplying lubricating oil to a high location without using an oil pump is preferable in terms of reducing the number of parts in the transmission and reducing manufacturing costs.

[0006] BACKGROUND ART Conventionally, a lubrication device described in Patent Document 1 is known as a lubrication device for transporting lubricating oil to high altitudes.

[0007] This lubrication device supplies lubricating oil transported by the rotation of a first rotating member to parts requiring lubricating oil, and is equipped with a second rotating member that holds the lubricating oil transported by the first rotating member and transports the lubricating oil to a catch tank by rotation, and a container having a first holding portion that holds the first rotating member and a second holding portion that holds the second rotating member.

[0008] In this lubrication device, the rotation of the first rotating member transports the lubricating oil from the first holding portion to the second holding portion, and the rotation of the second rotating member transports the lubricating oil from the second holding portion to the catch tank. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-214532 Summary of the Invention [Problem to be solved by the invention]

[0010] However, in the lubrication device described in Patent Document 1, the first rotating member and the second rotating member are held by the first holding portion and the second holding portion of the container, so a container extending from the first rotating member through the second rotating member to the catch tank is required, which increases the number of parts of the lubrication device and complicates the structure of the lubrication device.

[0011] Furthermore, the lubricating oil cannot be transported to a part requiring lubricating oil that is located higher than the catch tank. In other words, the lubrication device described in Patent Document 1 does not have a configuration for transporting lubricating oil to a part requiring lubricating oil that is located higher than the catch tank.

[0012] The present invention has been made in light of the above-mentioned circumstances, and aims to provide a lubrication structure for a power transmission device that is simple in configuration and can supply lubricating oil to a first rotating member located at a high altitude. [Means for solving the problem]

[0013] The present invention is a lubrication structure for a power transmission device comprising: a case member having a bottom portion where lubricating oil is stored and accommodating a first rotating member, a second rotating member, and a third rotating member; and a catch tank accommodated in the case member and capable of storing lubricating oil, wherein the first rotating member is arranged at the top so as to be coaxial with the motor shaft, the third rotating member is arranged at the bottom so as to be immersed in the lubricating oil at the bottom of the case member, and the second rotating member is arranged at a height position between the first rotating member and the third rotating member, and the catch tank comprises an opening through which lubricating oil scooped up by the third rotating member is introduced, and a movable member below the opening that forms an upper storage section that stores lubricating oil only at the top of the catch tank, and the lubricating oil stored in the upper storage section is supplied to the first rotating member by the second rotating member. [Effects of the Invention]

[0014] As described above, according to the present invention, it is possible to supply lubricating oil to the first rotating member located at a high place with a simple configuration. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic diagram of a power transmission device equipped with a lubrication structure according to an embodiment of the present invention, showing a state in which a movable member is switched to a first switching position. [Figure 2] FIG. 2 is a schematic diagram of a power transmission device including a lubrication structure according to one embodiment of the present invention, showing a state in which the movable member is switched to the second switching position. DETAILED DESCRIPTION OF THE INVENTION

[0016] A lubrication structure for a power transmission device according to one embodiment of the present invention comprises a case member that houses a first rotating member, a second rotating member, and a third rotating member, and that stores lubricating oil at the bottom, and a catch tank that is housed in the case member and is capable of storing lubricating oil, wherein the first rotating member is arranged at the top so as to be coaxial with the motor shaft, the third rotating member is arranged at the bottom so as to be immersed in the lubricating oil at the bottom of the case member, and the second rotating member is arranged at a height position between the first rotating member and the third rotating member, and the catch tank comprises an opening through which lubricating oil scooped up by the third rotating member is introduced, and a movable member that is below the opening and forms an upper storage section that stores lubricating oil only at the top of the catch tank, and the lubricating oil stored in the upper storage section is supplied to the first rotating member by the second rotating member.

[0017] As a result, the lubrication structure for a power transmission device according to one embodiment of the present invention can supply lubricating oil to the first rotating member located at a high place with a simple configuration. [Example]

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lubrication structure for a power transmission device according to an embodiment of the present invention will now be described with reference to the drawings. 1 and 2 are diagrams showing a lubrication structure for a power transmission device according to one embodiment of the present invention.

[0019] First, the configuration will be described. In Figures 1 and 2, the up, down, front, rear, left and right directions are based on the power transmission device when installed in a vehicle, and the front and rear direction of the vehicle is the front-to-rear direction, the left and right direction of the vehicle (vehicle width direction) is the left and right direction, and the up and down direction of the vehicle (vehicle height direction) is the up and down direction.

[0020] 1, a transmission 1 as a power transmission device mounted on a vehicle includes a transmission case 2 as a case member. The transmission case 2 houses a drive motor 3, a first rotating member 4, a second rotating member 5, and a third rotating member 6.

[0021] The first rotating member 4 has an input shaft 7 arranged coaxially with the motor shaft 3A of the drive motor 3, and an input gear 8 fixed to the input shaft 7 and rotating integrally with the input shaft 7.

[0022] The input shaft 7 is connected to the motor shaft 3A, and the power of the drive motor 3 is transmitted to the input shaft 7 via the motor shaft 3A. Bearings (not shown) are provided on both the left and right ends of the input shaft 7, and the input shaft 7 is rotatably supported by the transmission case 2 via the bearings.

[0023] The drive motor 3 is connected to a battery via an inverter and a boost converter (not shown), and receives power from the battery to rotate the motor shaft 3A.

[0024] A generator motor (not shown) is housed in the transmission case 2, and the drive motor 3 rotates a motor shaft 3A when supplied with electric power generated by the generator motor.

[0025] The transmission 1 of this embodiment is applicable to hybrid vehicles such as series hybrid vehicles and parallel hybrid vehicles.

[0026] The third rotating member 6 has an output shaft 10 and an output gear 11 fixed to the output shaft 10 and rotating integrally with the output shaft 10.

[0027] Bearings (not shown) are provided on both left and right ends of the output shaft 10, and the output shaft 10 is rotatably supported by the transmission case 2 via the bearings.

[0028] The second rotating member 5 has an intermediate shaft 13, and a first intermediate gear 14 and a second intermediate gear 15 that are fixed to the intermediate shaft 13 and rotate integrally with the intermediate shaft 13. Bearings (not shown) are provided on both left and right ends of the intermediate shaft 13, and the intermediate shaft 13 is rotatably supported by the transmission case 2 via the bearings.

[0029] The output gear 11 is made up of the final driven gear of the differential device, and the output shaft 10 has the output gear 11 on its outer periphery and is made up of a differential case that houses a differential mechanism (not shown) on its inner periphery. In other words, the output shaft 10 and the output gear 11 make up the differential device.

[0030] The input gear 8 is in mesh with a first intermediate gear 14, and the power of the motor is transmitted to the first intermediate gear 14 from the input gear 8.

[0031] The second intermediate gear 15 is capable of transmitting power to the output gear 11. In other words, the power of the drive motor 3 is transmitted from the motor shaft 3A to the output shaft 10 (differential case) via the input shaft 7, the input gear 8, the first intermediate gear 14, the intermediate shaft 13, the second intermediate gear 15, and the output gear 11.

[0032] The differential device having the output shaft 10 distributes the power input from the second intermediate gear 15 to left and right drive wheels (not shown) via left and right drive shafts (not shown).

[0033] In Figures 1 and 2, for the sake of convenience of explanation, the output gear 11 and the second intermediate gear 15 are arranged at a distance from each other, but the output gear 11 and the second intermediate gear 15 may be arranged close to each other so that they mesh with each other, or an even number of idler gears may be interposed between the output gear 11 and the second intermediate gear 15.

[0034] That is, in the transmission 1 of this embodiment, power is transmitted to the output gear 11 from the second intermediate gear 15 directly or via an idler gear.

[0035] The diameters of the input gear 8, output gear 11, first intermediate gear 14 and second intermediate gear 15 are set to reduce the power (rotational speed) transmitted from the input shaft 7 to the intermediate shaft 13, and reduce the power (rotational speed) transmitted from the intermediate shaft 13 to the output shaft 10.

[0036] The first rotating member 4 is located at the top and is arranged higher than the second rotating member 5 and the third rotating member 6. The third rotating member 6 is located at the bottom and is arranged lower than the first rotating member 4 and the second rotating member 5.

[0037] The second rotating member 5 is disposed at a height position between the first rotating member 4 and the third rotating member 6. In other words, the second rotating member 5 is disposed below the first rotating member 4 and above the third rotating member 6.

[0038] 1 viewed from the axial direction, the second rotating member 5 is disposed diagonally above and forward of the third rotating member 6. In other words, the second rotating member 5 is located above the side of the third rotating member 6 that moves downward as the vehicle moves forward.

[0039] 1, viewed from the axial direction, the first rotating member 4 is disposed obliquely above and rearward of the second rotating member 5. In other words, the first rotating member 4 is located above the side of the second rotating member 5 that moves downward as the vehicle moves forward.

[0040] 1 viewed from the axial direction, the first rotating member 4 is disposed diagonally above and forward of the third rotating member 6. In other words, the first rotating member 4 is located above the side of the third rotating member 6 that moves downward as the vehicle moves forward.

[0041] A catch tank 21 is housed in the transmission case 2, and the catch tank 21 is disposed below the second rotating member 5 and in front of the third rotating member 6.

[0042] An opening 21a is formed at the upper end of the catch tank 21. In other words, the top of the catch tank 21 opens upward and is capable of receiving the lubricating oil scooped up by the rotation of the third rotating member 6.

[0043] Regarding the opening 21a, the side on which the third rotating member 6 is not positioned is continuous with the wall surface of the transmission case 2, and is capable of receiving not only the lubricating oil scooped up by the rotation of the third rotating member 6 but also the lubricating oil flowing down the wall surface.

[0044] Lubricating oil O is stored at the bottom of the transmission case 2, and at least the lower part of the output gear 11 is immersed in the lubricating oil O.

[0045] The opening 21a is located diagonally above and in front of the output gear 11, and when the output gear 11 rotates in the clockwise direction R1 in Fig. 1, the lubricating oil scooped up by the output gear 11 is introduced into the catch tank 21 through the opening 21a. In Figs. 1 and 2, the rotational directions of the input shaft 7 and the intermediate shaft 13 are indicated by R2 and R3.

[0046] The upper edge of the opening 21a is disposed so as to surround the lower part of the first intermediate gear 14. A movable plate 22 constituting a movable member is provided in the catch tank 21. The movable plate 22 is capable of swinging freely around a rotation shaft 22a as a fulcrum.

[0047] The movable plate 22 swings between a closed position (see Figure 1, first switching position) in which the internal space of the catch tank 21 is divided into upper and lower sections and the lubricating oil is stored above it, and an open position (see Figure 2, second switching position) in which the internal space of the catch tank 21 is not divided into upper and lower sections and does not contribute to the storage of lubricating oil.

[0048] That is, the movable plate 22 in the closed position (first switching position) forms an upper reservoir 21A that stores lubricating oil above the catch tank 21 below the opening 21a (see FIG. 1).

[0049] A drive motor 23 is attached to the rotary shaft 22a, and the drive motor 23 rotates the rotary shaft 22a to cause the movable plate 22 to swing between a first switching position and a second switching position.

[0050] When the movable plate 22 is positioned at the first switching position, the movable plate 22 assumes a horizontal position and becomes the bottom wall of the upper reservoir 21A (see FIG. 1). As a result, the lubricating oil O3 (see FIG. 1) scooped up by the output gear 11 is stored in the upper reservoir 21A. In other words, the upper reservoir 21A forms a reservoir chamber in the upper part of the catch tank 21 that stores the lubricating oil.

[0051] As shown in Figure 1, when the movable plate 22 is positioned at the first switching position, a gap 24 is formed between the rear end of the movable plate 22 and the rear wall 21B of the catch tank 21, and the lubricating oil stored in the upper storage section 21A is gradually returned from the gap 24 to the inside of the catch tank 21 (the space below the upper storage section 21A).

[0052] Furthermore, the gap 24 is set so that the amount of lubricating oil flowing out from the gap 24 into the lower space of the catch tank 21 is less than the amount of lubricating oil flowing out from the discharge hole 21b formed in the lower part of the catch tank 21, which will be described later.

[0053] A discharge hole 21b is formed in the bottom of the catch tank 21, and the lubricating oil stored in the catch tank 21 is gradually discharged to the bottom of the transmission case 2 from the discharge hole 21b.

[0054] The first intermediate gear 14 is disposed within the opening 21a and extends into the internal space of the upper reservoir 21A.

[0055] At least the lower part of the first intermediate gear 14 is immersed in the lubricating oil O1 stored in the upper reservoir 21A, and when the first intermediate gear 14 rotates, the first intermediate gear 14 scoops up and splashes the lubricating oil O1 stored in the upper reservoir 21A, thereby supplying the lubricating oil O1 stored in the upper reservoir 21A to the input gear 8 and the bearings of the input shaft 7.

[0056] When the movable plate 22 is positioned at the second switching position, the movable plate 22 retreats from the horizontal position to the vertical position, and the upper reservoir 21A disappears (see FIG. 2).

[0057] This allows the lubricating oil O5 (see Figure 2) scooped up by the output gear 11 to reach the internal space of the catch tank 21 below without remaining in the upper storage section 21A, and as shown in Figure 2, the lubricating oil O5 scooped up by the output gear 11 is stored in the lower space of the catch tank 21, as shown by lubricating oil O2.

[0058] The drive motor 23 is driven based on a control signal output from a control unit 25. The control unit 25 receives a signal from a rotation sensor 26 that detects the number of rotations of the motor shaft 3A.

[0059] The control unit 25 calculates the number of rotations per unit time based on the number of rotations of the motor shaft 3A input from the rotation sensor 26, and calculates the rotation speed of the motor shaft 3A.

[0060] When the rotation speed of the motor shaft 3A is equal to or lower than a predetermined value, the control unit 25 determines that the vehicle is traveling at a low speed, and causes the drive motor 23 to switch the movable plate 22 to the first switching position.

[0061] When the rotation speed of the motor shaft 3A is greater than a predetermined value, the control unit 25 determines that the vehicle is traveling at a medium or high speed, and causes the drive motor 23 to switch the movable plate 22 to the second switching position.

[0062] Next, the operation of the lubrication structure of the transmission 1 of this embodiment will be described. When the control unit 25 determines that the rotation speed of the motor shaft 3A is low based on the detection information of the rotation sensor 26, it determines that the vehicle is traveling at a low speed.

[0063] When the vehicle travel speed is low, the rotation speed of the output gear 11 is low, the amount of lubricating oil O3 scooped up by the output gear 11 is small, and the flying distance is also short.

[0064] As a result, the amount of lubricating oil stored in the catch tank 21 is small, and the amount of lubricating oil supplied to the input gear 8 located at the top is also small.

[0065] In this case, the control unit 25 drives the drive motor 23 to switch the movable plate 22 to the first switching position as shown in FIG.

[0066] As a result, the lubricating oil O3 between the output gear 11 and the side wall of the transmission case 2, which is scooped up by the part of the output gear 11 that moves upward as the vehicle moves forward, is stored in the upper storage section 21A of the catch tank 21.

[0067] As shown in FIG. 1, when lubricating oil O1 is stored in the upper storage section 21A, the first intermediate gear 14 is immersed in the lubricating oil O1, and the lubricating oil O4 between the first intermediate gear 14 and the side wall of the transmission case 2 is scooped up by the part of the first intermediate gear 14 that moves upward as the vehicle moves forward, and is supplied to the input gear 8, and the bearings of the input gear 8 and the input shaft 7 are lubricated by the lubricating oil along with the first intermediate gear 14.

[0068] Furthermore, when the upper reservoir 21A is full, the lubricating oil O1 overflows over the upper edge of the opening 21a and returns to the bottom of the transmission case 2, so that the amount of lubricating oil O stored at the bottom of the transmission case 2 can be relatively increased, and the amount of lubricating oil O3 scooped up by the output gear 11 can be increased.

[0069] On the other hand, when the control unit 25 determines that the rotation speed of the motor shaft 3A is high based on the detection information of the rotation sensor 26, it determines that the vehicle is traveling at a medium or high speed.

[0070] When the vehicle is traveling at a high speed, the rotation speed of the output gear 11 is high, so the amount of lubricating oil O5 scooped up by the output gear 11 is large and the flying distance is also long.

[0071] This increases the amount of lubricating oil supplied to the input gear 8 and first intermediate gear 14 located at the top, and the input gear 8 and the bearings of the input shaft 7 as well as the first intermediate gear 14 are lubricated by the lubricating oil.

[0072] In this case, the control unit 25 drives the drive motor 23 to switch the movable plate 22 to the second switching position as shown in FIG.

[0073] As a result, lubricating oil O5 scooped up by the output gear 11 rotating at high speed is stored in the catch tank 21, and less lubricating oil O is stored at the bottom of the transmission case 2, lowering the liquid level of the lubricating oil O. This reduces the agitation resistance of the output gear 11 and prevents an increase in the power consumption of the motor. In addition, because lubricating oil O1 is not stored in the upper reservoir 21A, the agitation resistance of the first intermediate gear 14 can be reduced.

[0074] As described above, the lubrication structure of the transmission 1 of this embodiment includes a transmission case 2 in which lubricating oil O is stored at the bottom and which houses the first rotating member 4, the second rotating member 5, and the third rotating member 6, and a catch tank 21 housed in the transmission case 2 and in which the lubricating oil is stored.

[0075] The first rotating member 4 is arranged at the top so as to be coaxial with the motor shaft 3A, the third rotating member 6 is arranged at the bottom so as to be immersed in the lubricating oil O at the bottom of the transmission case 2, and the second rotating member 5 is arranged at a height position between the first rotating member 4 and the third rotating member 6.

[0076] The catch tank 21 has an opening 21a through which the lubricating oil scooped up by the third rotating member 6 is introduced, and a movable plate 22 that forms an upper storage section 21A below the opening 21a and stores the lubricating oil O1 only in the upper part of the catch tank 21, and the lubricating oil O1 stored in the upper storage section 21A is supplied to the first rotating member 4 by the second rotating member 5.

[0077] This makes it possible to supply lubricating oil to the first rotating member 4 located at a high place with a simple configuration in which the movable plate 22 is provided in the catch tank 21, and prevents the manufacturing costs of the transmission 1 from increasing.

[0078] Furthermore, according to the lubrication structure of the transmission 1 of this embodiment, the first rotating member 4 has an input shaft 7 to which power is transmitted from the motor shaft 3A and an input gear 8 that rotates integrally with the input shaft 7, and the third rotating member 6 has an output shaft 10 and an output gear 11 that rotates integrally with the output shaft 10.

[0079] In addition, the second rotating member 5 has an intermediate shaft 13, a first intermediate gear 14 that rotates integrally with the intermediate shaft 13 and reduces the speed of the power transmitted from the input gear 8, and a second intermediate gear 15 that rotates integrally with the intermediate shaft 13 and transmits the power to the output gear 11 at a reduced speed.

[0080] As a result, the lubricating oil O1 stored in the upper reservoir 21A can be supplied to the input gear 8 and the bearing of the input shaft 7, which are located higher than the first intermediate gear 14, by the rotation of the first intermediate gear 14.

[0081] Furthermore, according to the lubrication structure of the transmission 1 of this embodiment, the movable plate 22 can be switched between a first switching position in which it serves as the bottom wall of the upper storage section 21A, thereby storing the lubricating oil in the upper storage section 21A, and a second switching position in which it retreats from the first switching position and can store the lubricating oil below the upper storage section 21A.

[0082] This allows the amount of lubricating oil stored in the catch tank 21 to be easily adjusted by switching the movable plate 22 between the first switching position and the second switching position depending on the state of the transmission 1.

[0083] Furthermore, according to the lubrication structure of the transmission 1 of this embodiment, the movable plate 22 is switched between the first switching position and the second switching position by a signal from the control unit 25, and the control unit 25 switches the movable plate 22 between the first switching position and the second switching position according to the rotational speed of the motor shaft 3A.

[0084] This allows the movable plate 22 to be switched between the first switching position and the second switching position depending on the traveling speed of the vehicle.

[0085] Therefore, when the vehicle is traveling at low speed, the movable plate 22 is switched to the first switching position, and the first intermediate gear 14 supplies lubricating oil to the input gear 8, allowing the input gear 8 and the bearing of the input shaft 7 to be lubricated by the lubricating oil.

[0086] In addition, when the vehicle is traveling at medium or high speed, the movable plate 22 is switched to the second switching position, and the output gear 11 supplies lubricating oil to the first intermediate gear 14, the second intermediate gear 15, the bearing of the intermediate shaft 13, the input gear 8, and the bearing of the input shaft 7, so that the first intermediate gear 14, the second intermediate gear 15, the bearing of the intermediate shaft 13, the input gear 8, and the bearing of the input shaft 7 can be lubricated by the lubricating oil.

[0087] In addition, the lubrication structure of the transmission 1 in this embodiment switches the movable plate 22 between the first switching position and the second switching position depending on the rotational speed of the motor shaft 3A (the vehicle's running speed), but the movable plate 22 may also be switched between the first switching position and the second switching position depending on the temperature of the lubricating oil.

[0088] That is, when the temperature of the lubricating oil is low, the viscosity of the lubricating oil is high, so the movable plate 22 is switched to the first switching position, and when the temperature of the lubricating oil is high, the movable plate 22 is switched to the second switching position.

[0089] Furthermore, according to the lubrication structure of the transmission 1 of this embodiment, the first intermediate gear 14 scoops up the lubricating oil O1 stored in the upper reservoir 21A, but an impeller may be provided on the intermediate shaft 13, and the lubricating oil O1 stored in the upper reservoir 21A may be scooped up to the input shaft 7 by the impeller.

[0090] While an embodiment of the present invention has been disclosed, it will be apparent to one skilled in the art that modifications may be made thereto without departing from the scope of the present invention, and it is intended that all such modifications and equivalents be included in the following claims. [Explanation of symbols]

[0091] 1. Transmission (power transmission device) 2 Transmission case (case material) 3A motor shaft 4. First rotating member 5 Second rotating member 6. Third rotating member 7 input shaft (first rotating member) 8 input gear (first rotating member) 10 Output shaft (second rotating member) 11 Output gear (second rotating member) 13 Intermediate shaft (third rotating member) 14 First intermediate gear (third rotating member) 15 Second intermediate gear (third rotating member) 21 Catch Tank 21A Upper reservoir 21a opening 22 Movable plate (movable part) 25 Control Unit

Claims

1. a case member having a bottom portion in which lubricating oil is stored and accommodating the first rotating member, the second rotating member, and the third rotating member; a catch tank accommodated in the case member and capable of storing lubricating oil, the first rotating member is disposed at the top so as to be coaxial with the motor shaft, the third rotating member is disposed at the bottom so as to be immersed in the lubricating oil at the bottom of the case member, the second rotating member is disposed at a height position between the first rotating member and the third rotating member, The catch tank is an opening into which the lubricating oil scooped up by the third rotating member is introduced; a movable member that forms an upper reservoir that stores lubricating oil only above the catch tank below the opening, 10. A lubrication structure for a power transmission device, wherein the lubricating oil stored in the upper reservoir is supplied to the first rotating member by the second rotating member.

2. the first rotating member has an input shaft to which power is transmitted from the motor shaft and an input gear that rotates integrally with the input shaft, the third rotating member has an output shaft and an output gear that rotates integrally with the output shaft, 2. The lubrication structure for a power transmission device according to claim 1, wherein the second rotating member has an intermediate shaft, a first intermediate gear that rotates integrally with the intermediate shaft and reduces the speed of the power transmitted from the input gear, and a second intermediate gear that rotates integrally with the intermediate shaft and transmits the power to the output gear at a reduced speed.

3. The movable member is A lubrication structure for a power transmission device as described in claim 1 or claim 2, characterized in that it can be switched between a first switching position in which it serves as the bottom wall of the upper storage section, thereby storing lubricating oil in the upper storage section, and a second switching position in which it retreats from the first switching position and can store lubricating oil below the upper storage section.

4. the movable member is switched between the first switching position and the second switching position in response to a signal from a control unit, 4. The lubrication structure for a power transmission device according to claim 3, wherein the control unit switches the movable member between the first switching position and the second switching position in accordance with the rotational speed of the motor shaft.

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