JP2020091001A - Lubrication structure of power transmission device - Google Patents

Abstract

To provide a lubrication structure of a power transmission device which enables proper reduction of a loss caused by agitation resistance of oil without enlarging a physical constitution and providing an oil tank and a reservoir tank, etc. formed separately.SOLUTION: A lubrication structure 1 of a power transmission device 2 includes: a case 3 in which oil 7 is enclosed; a rotary member 4 housed in the case 3; and a feeding pump 5, which supplies the oil 7 to the rotary member 4, and lubricates or cools the rotary member 4 with the oil 7. The case 3 is formed with: a first chamber 8 in which the rotary member 4 is disposed and rotates; and a second member 9 which is partitioned from the first chamber 8 and isolates the oil 7 from the first chamber 8 and stores the oil 7. The lubrication structure 1 is provided with: a feeding pump 5; and a scavenging pump 6 which suctions the oil 7 stored in the second chamber 9 to supply the oil 7 to the rotary member 4 and suctions the oil 7 flowing into the first chamber 8 to discharge the oil 7 from the first chamber 8.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lubricating structure for supplying oil to a power transmission device such as a transaxle mounted in a vehicle or a drive unit incorporating a motor.

Patent Document 1 describes a vehicle drive device (transaxle) for the purpose of preventing the connection terminals of a terminal block from being immersed in oil. In the transaxle described in Patent Document 1, a terminal block for installing the connection terminal is provided inside the transaxle case. Further, oil is sealed inside the transaxle case so that the oil level when the vehicle is horizontal is below the terminal block in the vertical direction. When the vehicle leans so that the oil level of the oil approaches the terminal block, the oil that approaches the terminal block at that time flows into the oil sump before flowing into the terminal block.

In addition, Patent Document 2 describes an invention relating to an engine lubrication device. The engine lubrication device described in Patent Document 2 communicates with a gear chamber accommodating a speed change gear device, and an oil tank joined to a bottom surface of a crankcase, and oil in the oil tank is sucked to lubricate the engine. And a scavenging pump that sucks oil from the crank chamber and supplies the oil to the transmission gear device in the gear chamber. A discharge oil passage of the scavenging pump is formed in a partition wall between the crank chamber and the gear chamber. The discharge oil passage is provided with an oil nozzle that causes the oil, which the scavenging pump sucks from the crank chamber and sends under pressure, to be jetted downward from the upper portion of the gear chamber to the transmission gear device. The oil that lubricates the transmission gear device falls to the bottom of the gear chamber and flows back to the oil tank.

Japanese Unexamined Patent Application Publication No. 2018-121432 JP, 2005-180488, A

The transaxle described in the above-mentioned Patent Document 1 has a conventional general configuration. In the transaxle, for example, a so-called wet sump system in which a rotating member such as a gear or a rotor of a motor is immersed in an oil reservoir in the transaxle case. Has been adopted. In such a wet sump method, since the rotating member as described above rotates in a state of being immersed in oil, a loss (agitation loss) due to the agitation resistance of the oil inevitably occurs. On the other hand, the engine lubrication device described in Patent Document 2 employs a so-called dry sump system, and oil that lubricates each part of the engine and drops to the bottom of the crank chamber immediately enters the scavenging pump. Be sucked. Therefore, the oil is not substantially accumulated in the crank chamber, and the crankshaft is not subjected to the oil stirring resistance.

Therefore, by adopting the dry sump system such as the engine lubrication device described in Patent Document 2 in the power transmission device such as the transaxle described in Patent Document 1, the above stirring loss is reduced. As a result, the transmission efficiency of the power transmission device can be improved. Further, compared to the wet sump system, the oil can be supplied more stably. However, in the dry sump type lubrication structure, a reservoir tank, a separate oil tank, or the like must be provided in order to eliminate oil accumulation in the case. For example, in the engine lubrication device described in Patent Document 2, a large-capacity oil tank is provided below the crankcase, as shown in FIGS. 2 and 3 of Patent Document 2. Therefore, when the dry sump method is adopted for the purpose of reducing the stirring loss, a space for providing the oil tank or the reservoir tank as described above is required, and as a result, the apparatus becomes large and, for example, the vehicle This leads to a decrease in mountability on the.

The present invention has been conceived by paying attention to the above technical problems, and loss due to agitation resistance of oil is achieved without expanding the physique or providing a separate oil tank or reservoir tank. It is an object of the present invention to provide a lubricating structure for a power transmission device capable of appropriately reducing the above.

To achieve the above object, the present invention comprises a case in which oil is enclosed, a predetermined rotating member housed in the case, and a feeding pump for supplying the oil to the rotating member, In a lubricating structure of a power transmission device that lubricates and cools the rotating member with oil, the case is divided from the first chamber in which the rotating member is disposed and the rotating member rotates, and the first chamber, A second chamber that stores oil separated from the first chamber, wherein the feeding pump sucks the oil stored in the second chamber and supplies the oil to the rotating member; And a scavenging pump that sucks the oil that has flowed into the first chamber and discharges the oil from the first chamber.

Further, the scavenging pump according to the present invention is characterized in that the oil sucked from the first chamber is discharged toward the second chamber.

Further, the scavenging pump according to the present invention is characterized in that the oil sucked from the first chamber is discharged toward the rotating member.

Further, the rotating member in the present invention includes a motor that functions as at least one of a prime mover and a generator, and a transmission rotating element that is involved in power transmission in the power transmission device, separately from the motor. And a second oil pump for supplying the oil sucked from the second chamber to the motor, and a second oil pump supplying the oil sucked from the second chamber to the transmission rotary element. It is characterized by having.

Further, the invention is characterized in that an oil cooler for cooling the oil is provided, and the oil sucked by the first oil pump is cooled by the oil cooler and supplied to the motor.

Further, the present invention includes an oil receiver which is located vertically above the rotating member and stores the oil sucked by at least one of the feeding pump and the scavenging pump, and is stored in the oil receiver. It is characterized in that the oil is dropped from the oil receiver and supplied to the rotating member.

In the lubricating structure for a power transmission device of the present invention, two partitioned spaces, a first chamber and a second chamber, are formed in the case of the power transmission device. For example, a gear, a bearing, or a rotating member of a power transmission device such as a motor is arranged in the first chamber and rotates within the space of the first chamber. The oil that lubricates and cools the rotating member is stored in the second chamber that is separated from the first chamber. Therefore, the oil stored in the second chamber does not flow out into the first chamber. The oil supplied from the second chamber to the rotating member by the feeding pump lubricates and cools the rotating member and flows into the first chamber. The oil that has flowed into the first chamber is discharged from the first chamber by the scavenging pump without being stored in the first chamber. Since the oil is discharged by the scavenging pump, the oil surface height of the oil in the first chamber is lowered, and as a result, the rotating member is not immersed in the oil in the first chamber. Therefore, the rotating member can rotate in the first chamber without receiving the stirring resistance of oil. Further, the first chamber and the second chamber can be easily formed by providing, for example, a wall serving as a partition or a dam between the first chamber and the second chamber. Therefore, according to the lubrication structure of the power transmission device of the present invention, the loss due to the agitation resistance of the oil is appropriately reduced without expanding the size of the device or providing a separate oil tank or reservoir tank. can do. As a result, the transmission efficiency of the power transmission device can be improved.

Further, according to the lubricating structure of the power transmission device of the present invention, the oil discharged from the first chamber by the scavenging pump can be directly stored in the second chamber. Therefore, the oil can be efficiently circulated in the case of the power transmission device. Therefore, the rotating member can be appropriately lubricated and cooled.

Further, according to the lubricating structure of the power transmission device of the present invention, the oil discharged from the first chamber can be supplied to the rotating member by the scavenging pump. Therefore, the burden on the feeding pump that supplies oil to the rotating member can be reduced. Therefore, an oil pump whose performance is suppressed can be adopted as the feeding pump, which in turn can reduce the cost of the device.

Further, according to the lubrication structure of the power transmission device of the present invention, the feeding pump is composed of the two oil pumps of the first oil pump and the second oil pump. Then, the first oil pump and the second oil pump can function as a feeding pump dedicated to a motor and a feeding pump dedicated to transmission rotary elements such as gears and bearings, respectively. Therefore, by configuring the feeding pump with two oil pumps, it is possible to set an appropriate oil pump corresponding to the respective characteristics of the motor and the transmission rotary element. Alternatively, the two oil pumps can be appropriately operated depending on the respective conditions of the motor and the transmission rotary element. Therefore, it is possible to suppress the pump loss of the feeding pump and improve the transmission efficiency of the power transmission device.

Further, according to the lubricating structure of the power transmission device of the present invention, in particular, an oil cooler for cooling the oil supplied to the motor is provided. The motor requires a relatively large amount of oil and is also hotter compared to the transmission rotating element. Therefore, the motor whose temperature is lowered by the oil cooler can effectively lubricate and cool the motor.

According to the lubricating structure of the power transmission device of the present invention, the oil receiver is formed vertically above the rotating member. The oil receiver temporarily stores at least one of the oil sucked from the second chamber by the feeding pump and the oil sucked from the first chamber by the scavenging pump. Then, the stored oil is dropped by the action of gravity to supply the oil to the rotating member. Therefore, it is not necessary to pump the oil at a high pressure between the feeding pump and/or the scavenging pump and the oil receiver, and the oil can be sent at a pressure as low as the discharge pressure of the pump. Therefore, it is possible to suppress the pump loss of the feeding pump and/or the scavenging pump and improve the transmission efficiency of the power transmission device.

It is a figure for explaining an example of a lubrication structure of a power transmission device of the present invention, provided with two oil pumps as a feeding pump, and the oil of the 1st chamber sucked by the scavenging pump is directly sent to the 2nd chamber. It is a figure which shows the structure to discharge. It is a figure for demonstrating the other example of the lubrication structure of the power transmission device of this invention, provided with one oil pump as a feeding pump, and the oil of the 1st chamber sucked by the scavenging pump was directly It is a figure which shows the structure discharged|emitted to a chamber. It is a figure for explaining other examples of the lubrication structure of the power transmission device of this invention, provided with two oil pumps as a feeding pump, and lubricating the rotary member with the oil of the 1st chamber sucked by the scavenging pump. It is a figure which shows the structure utilized for cooling. FIG. 9 is a diagram for explaining another example of the lubricating structure of the power transmission device of the present invention, in which one oil pump is provided as a feeding pump, and the oil in the first chamber sucked by the scavenging pump is lubricated to the rotating member. It is a figure which shows the structure utilized for cooling. It is a figure for demonstrating the other example of the lubrication structure of the power transmission device of this invention, provided with two oil pumps as a feeding pump, and the oil of the 1st chamber suctioned by the scavenging pump was directly FIG. 3 is a diagram showing a configuration in which oil that has been discharged to a chamber and sucked by a feeding pump is temporarily stored in an oil receiver. FIG. 9 is a diagram for explaining another example of the lubricating structure of the power transmission device of the present invention, in which one oil pump is provided as a feeding pump, and the oil in the first chamber sucked by the scavenging pump is lubricated to the rotating member. FIG. 3 is a diagram showing a configuration in which oil used for cooling and sucked by a feeding pump is temporarily stored in an oil receiver.

Embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples in which the present invention is embodied, and do not limit the present invention.

FIG. 1 shows an example of a lubricating structure of a power transmission device which is an object of the embodiment of the present invention. The lubrication structure 1 in the embodiment of the present invention supplies oil to a power transmission device 2 mounted on a vehicle (not shown), for example. Therefore, the lubrication structure 1 in the embodiment of the present invention has a power transmission device 2, a case 3 of the power transmission device 2, a rotating member (BRG, GEAR, MG) 4, a feed of the power transmission device 2, as a main component. It is equipped with a ding pump (O/P) 5 and a scavenging pump (O/P) 6.

The power transmission device 2 transmits torque output from a predetermined power source (not shown) to an output-side member such as a drive shaft (not shown). The power transmission device 2 according to the embodiment of the present invention is applied to, for example, a transmission (not shown), a transaxle having a motor (not shown) as a driving force source, a motor drive unit, or the like. The power transmission device 2 has a case 3 and a rotating member 4 which will be described later.

The case 3 forms an outer shell of the power transmission device 2. For example, in a transaxle for a vehicle, a housing, a case, and a plurality of assemblies (not shown) such as a rear cover are assembled to form an outer shell of the transaxle. In such a case, the assembly of each assembly is collectively referred to as the case 3. The case 3 houses the rotating member 4, which is a component of the power transmission device 2. The case 3 is filled with oil 7 for lubricating and cooling the rotating member 4. That is, the case 3 has a liquid-tight structure in which, for example, a divided surface or a combined surface is sealed, and the oil 7 is held inside the case 3 in a liquid-tight state.

In the case 3 according to the embodiment of the present invention, a first chamber 8 and a second chamber 9 which are divided into two parts are formed inside the case 3. The first chamber 8 is a space in which the rotating member 4 described later is arranged and the rotating member 4 rotates. The second chamber 9 is a space which is separated from the first chamber 8 and stores the oil 7 in a manner separated from the first chamber 8. The first chamber 8 and the second chamber 9 are separated from each other by, for example, a partition plate or wall plate-shaped member or a dam-shaped member. In the example shown in FIG. 1, the partition wall 10 formed between the first chamber 8 and the second chamber 9 separates the first chamber 8 and the second chamber 9 from each other. The second chamber 9 is formed so that the oil 7 stored in the second chamber 9 does not flow out to the first chamber 8. That is, the oil 7 in the second chamber 9 is isolated from the first chamber 8 and stored in the second chamber 9.

As described above, the first chamber 8 and the second chamber 9 according to the embodiment of the present invention are provided with the partition wall 10 serving as, for example, a partition or a dam between the first chamber 8 and the second chamber 9. It can be easily formed. Therefore, for example, the case 3 having the first chamber 8 and the second chamber 9 can be easily formed by only slightly modifying the case of a ready-made power transmission device. Therefore, as compared with, for example, an off-the-shelf power transmission device, the case 3 in the embodiment of the present invention, and the third embodiment without expanding the physique or without providing a separate member such as an oil tank or a reservoir tank, The first chamber 8 and the second chamber 9 can be easily formed.

The rotating member 4 is a member or component that rotates inside the power transmission device 2, and is a generic term for a member or component that is lubricated and cooled by the supply of the oil 7. .. For example, the gear (GEAR) 11 and the bearing (BRG) 12 that configure the power transmission device 2 correspond to the rotating member 4 in the embodiment of the present invention. As described above, when the power transmission device 2 is a transaxle or a motor drive unit in which the motor (MG) 13 is incorporated, the motor 13, specifically, the rotor of the motor 13 (not shown). ), or a cooling portion such as a coil end (not shown) of the motor 13 corresponds to the rotating member 4 in the embodiment of the present invention.

The motor 13 as described above is, for example, a permanent magnet type synchronous motor or an electric motor such as an induction motor. The motor 13 functions as a prime mover that is driven by being supplied with power from, for example, a battery (not shown) to output torque. Further, the motor 13 may have a function as a generator that generates electric power by being driven by receiving torque transmitted from a wheel (not shown) of the vehicle, for example, the motor 13 is It may be a so-called motor generator having both a function as a generator and a function as a prime mover. In the embodiment of the present invention, in order to distinguish the motor 13 from the gear 11 and the bearing 12 as described above, the power transmission in the power transmission device 2 such as the gear 11 and the bearing 12 is performed separately from the motor 13. The rotary member 4 involved in the above is referred to as a transmission rotary element 14. The rotary member 4 according to the embodiment of the present invention, which includes both the motor 13 and the transmission rotary element 14 described above, is arranged in the first chamber 8 in the case 3, and the space of the first chamber 8 is set. It rotates within the range of.

The feeding pump 5 supplies the oil 7 in the case 3 to the rotating member 4. Specifically, the feeding pump 5 is an oil pump that sucks the oil 7 stored in the second chamber 9 of the case 3 and supplies the oil 7 to the rotating member 4. In the example shown in FIG. 1, the feeding pump 5 has two oil pumps, a first oil pump (O/P) 15 and a second oil pump (O/P) 16. As the feeding pump 5, the first oil pump 15 supplies the oil 7 sucked from the second chamber 9 via the strainer 17 to the motor 13 of the rotating member 4. As the feeding pump 5, the second oil pump 16 supplies the oil 7 sucked from the second chamber 9 via the strainer 18 to the transmission rotary element 14 of the rotary member 4. The first oil pump 15 and the second oil pump 16, that is, the feeding pump 5 is, for example, a mechanical oil pump driven by a torque transmitted from a predetermined transmission rotary element 14 of the power transmission device 2. Alternatively, it may be an electric oil pump driven by a torque output by a predetermined electric motor (not shown). In the example shown in FIG. 1, the lubricating structure 1 is provided with an oil cooler 21 described later, and the oil 7 sucked from the second chamber 9 by the first oil pump 15 is cooled by the oil cooler 21. Is supplied to the motor 13.

As described above, in the lubricating structure 1 according to the embodiment of the present invention, the feeding pump 5 is composed of the two oil pumps of the first oil pump 15 and the second oil pump 16. Then, the first oil pump 15 and the second oil pump 16 can function as the feeding pump 5 dedicated to the motor 13 and the feeding pump 5 dedicated to the transmission rotary element 14 such as the gear 11 and the bearing 12, respectively. it can. For example, the motor 13 requires a relatively large amount of oil 7 when the temperature of the motor 13 is high. On the other hand, the transmission rotary element 14 other than the motor 13 requires a relatively small amount of oil 7 as compared with the motor 13. Thus, the motor 13 and the transmission rotary element 14 differ in the amount of oil 7 required and the situation in which the oil 7 is required. On the other hand, by configuring the feeding pump 5 with the two oil pumps 15 and 16 as described above, an appropriate oil pump corresponding to the characteristics of the motor 13 and the transmission rotary element 14 can be set. Alternatively, the two oil pumps 15 and 16 can be appropriately operated depending on the respective conditions of the motor 13 and the transmission rotary element 14. Therefore, the pump loss of the feeding pump 5, that is, the first oil pump 15 and the second oil pump 16 can be suppressed. As a result, the transmission efficiency of the power transmission device 2 can be improved.

The scavenging pump 6 sucks the oil 7 that has flowed into the first chamber 8 and discharges it from the first chamber 8. In the example shown in FIG. 1, the scavenging pump 6 is an oil pump that directly discharges the oil 7 sucked from the first chamber 8 to the second chamber 9. Specifically, an oil passage 20 that allows the oil 7 to flow between the discharge port (not shown) of the scavenging pump 6 and the second chamber 9 is provided. Therefore, in the example shown in FIG. 1, the oil 7 that has flowed into the first chamber 8 is sucked by the scavenging pump 6 through the strainer 19 and transferred to the second chamber 9 through the oil passage 20. In the embodiment of the present invention, the oil passage 20 is not provided, and the oil 7 sucked from the first chamber 8 is transferred to the second chamber 9 by being ejected from the scavenging pump 6, for example. May be. The scavenging pump 6 is, for example, a mechanical oil pump driven by the torque transmitted from a predetermined transmission rotary element 14 of the power transmission device 2. Alternatively, it may be an electric oil pump driven by a torque output by a predetermined electric motor (not shown).

As described above, in the lubrication structure 1 according to the embodiment of the present invention, the case 3 of the power transmission device 2 has the two divided spaces of the first chamber 8 and the second chamber 9 formed therein. For example, the rotating member 4 such as the gear 11 and the bearing 12 or the motor 13 is arranged in the first chamber 8 and rotates within the space of the first chamber 8. The oil 7 that lubricates and cools the rotating member 4 is stored in the second chamber 9 that is separated from the first chamber 8. Therefore, the oil 7 stored in the second chamber 9 does not flow out to the first chamber 8. The oil 7 supplied from the second chamber 9 to the rotating member 4 by the feeding pump 5 lubricates and cools the rotating member 4 and flows into the first chamber 8. The oil 7 flowing into the first chamber 8 is discharged from the first chamber 8 by the scavenging pump 6 without being stored in the first chamber 8. The oil 7 is discharged from the first chamber 8 by the scavenging pump 6, so that the oil surface height of the oil 7 in the first chamber 8 is lowered, and as a result, the rotating member 4 is removed from the oil in the first chamber 8. Do not soak in 7. That is, the inside of the first chamber 8 is in a so-called dry sump state. Therefore, the rotating member 4 can rotate in the first chamber 8 without receiving the stirring resistance of the oil 7. In addition, the first chamber 8 and the second chamber 9 can be easily provided by providing a wall such as a partition wall, which serves as a partition or a dam, between the first chamber 8 and the second chamber 9. Can be formed. In the example shown in FIG. 1, the oil 7 discharged from the first chamber 8 by the scavenging pump 6 can be directly stored in the second chamber 9. As a result, the oil 7 can be efficiently circulated in the case 3.

Therefore, according to the lubrication structure 1 in the embodiment of the present invention, the loss due to the agitation resistance of the oil 7 is prevented without enlarging the physique of the power transmission device 2 or without providing a separate oil tank or reservoir tank. Can be appropriately reduced. As a result, the transmission efficiency of the power transmission device 2 can be improved.

In the lubricating structure 1 according to the embodiment of the present invention, an oil cooler 21 that cools the oil 7 may be provided. By providing the oil cooler 21, the oil 7 sucked by the feeding pump 5 can be cooled by the oil cooler 21 and supplied to the rotating member 4. In the example shown in FIG. 1, the oil cooler 21 is provided in the oil supply system 22 of the first oil pump 15 of the two feeding pumps 5. Therefore, the oil 7 sucked from the second chamber 9 by the first oil pump 15 is cooled by the oil cooler 21 and supplied to the motor 13.

As described above, in the lubrication structure 1 according to the embodiment of the present invention, the oil cooler 21 that cools the oil 7 supplied to the motor 13 is provided. As described above, the motor 13 requires a relatively large amount of oil 7 and becomes hotter than the transmission rotary element 14. Therefore, the motor 13 can be effectively lubricated and cooled by the oil 7 whose temperature is lowered by the oil cooler 21.

2 to 6 show other structural examples of the lubricating structure of the power transmission device according to the embodiment of the present invention. In addition, in the lubrication structure 1 shown in FIGS. 2 to 6, components having the same structure and function as those of the lubrication structure 1 shown in FIG. Alternatively, the same reference numerals as in any of the above figures are attached.

FIG. 2 shows a lubricating structure 1 having one oil pump as the feeding pump 5 and directly discharging the oil 7 in the first chamber 8 sucked by the scavenging pump 6 to the second chamber 9. .. That is, while the lubrication structure 1 shown in FIG. 1 has a configuration including two oil pumps 15 and 16 as the feeding pump 5, the lubrication structure 1 shown in FIG. 5 are integrated into one oil pump 30. Therefore, in the lubrication structure 1 shown in FIG. 2, the oil pump 30 serves as the feeding pump 5 and absorbs the oil 7 sucked from the second chamber 9 through the strainer 31, that is, the rotation member 4, that is, the motor 13 and the transmission rotation element. Supply to both 14 The oil pump 30 is, for example, a mechanical oil pump driven by the torque transmitted from a predetermined transmission rotary element 14 of the power transmission device 2, like the other feeding pumps 5 described above. Alternatively, it may be an electric oil pump driven by a torque output by a predetermined electric motor (not shown).

In addition, in the lubricating structure 1 shown in FIG. 2, the oil cooler 21 is provided similarly to the lubricating structure 1 shown in FIG. In the lubrication structure 1 shown in FIG. 2, the oil cooler 21 is provided in the oil pump 30, that is, the oil supply system 32 of the feeding pump 5. Therefore, the oil 7 sucked from the second chamber 9 by the oil pump 30 is cooled by the oil cooler 21 and supplied to both the motor 13 and the transmission rotary element 14.

As described above, in the lubrication structure 1 shown in FIG. 2, the feeding pump 5 is composed of one oil pump 30. Therefore, as compared with the case where the feeding pump 5 is configured by the two oil pumps 15 and 16 as in the lubricating structure 1 shown in FIG. The cost of the lubrication structure 1 can be reduced.

3 and 4 show a lubricating structure 1 configured to utilize the oil 7 in the first chamber 8 sucked by the scavenging pump 6 for lubricating and cooling the rotating member 4. That is, while the lubricating structure 1 shown in FIGS. 1 and 2 has a configuration in which the oil 7 in the first chamber 8 sucked by the scavenging pump 6 is directly discharged toward the second chamber 9, The lubricating structure 1 shown in FIGS. 3 and 4 is configured to discharge the oil 7 in the first chamber 8 sucked by the scavenging pump 6 toward the rotating member 4. That is, in the lubrication structure 1 shown in FIGS. 3 and 4, as the scavenging pump 6, the oil pump 40 sucks the oil 7 sucked from the first chamber 8 through the strainer 41 into the rotating member 4, that is, the motor 13 and Supply both of the transmission rotary elements 14. Specifically, the oil 7 is circulated between the oil pump 40, that is, the discharge port (not shown) of the scavenging pump 6, and the rotating member 4, that is, the gear 11, the bearing 12, and the motor 13. A refueling system 42 is provided. Therefore, in the example shown in FIG. 3 and FIG. 4, the oil 7 that has flowed into the first chamber 8 is sucked by the scavenging pump 6, passes through the oil supply system 42, and passes through the gear 11, the bearing 12, and the motor 13. Each is supplied to the rotating member 4. The oil pump 40, like the other scavenging pumps 6 described above, is, for example, a mechanical oil pump driven by the torque transmitted from a predetermined transmission rotary element 14 of the power transmission device 2. Alternatively, it may be an electric oil pump driven by a torque output by a predetermined electric motor (not shown).

In the lubrication structure 1 shown in FIG. 3, the feeding pump 5 is composed of two oil pumps 15 and 16 as in the lubrication structure 1 shown in FIG. Further, in the lubrication structure 1 shown in FIG. 4, the feeding pump 5 is composed of one oil pump 30, as in the lubrication structure 1 shown in FIG.

As described above, in both of the lubricating structures 1 shown in FIGS. 3 and 4, the oil 7 discharged from the first chamber 8 can be supplied to the rotating member 4 by the scavenging pump 6. Therefore, the burden on the feeding pump 5 that supplies the oil 7 to the rotating member 4 can be reduced. Therefore, a cheaper oil pump with suppressed performance can be adopted as the feeding pump 5, and the cost of the lubricating structure 1 can be reduced accordingly.

FIG. 5 and FIG. 6 show the lubricating structure 1 in which the oil 7 sucked by the feeding pump 5 is temporarily stored in the oil receiver. In the lubrication structure 1 shown in FIGS. 5 and 6, the oil receiver 50 is provided above the rotating member 4 in the case 3 in the vertical direction (upper side in the vertical direction of FIG. 5 ). The oil receiver 50 is configured to temporarily store the oil 7 sucked by at least one of the feeding pump 5 and the scavenging pump 6. At the same time, the oil receiver 50 is configured to drop the stored oil 7 from the oil receiver 50 and supply it to the rotating member 4. In the lubricating structure 1 shown in FIG. 5, the oil receiver 50 stores the oil 7 sucked by the feeding pump 5. In the lubrication structure 1 shown in FIG. 6, the oil receiver 50 stores the oil 7 sucked by both the feeding pump 5 and the scavenging pump 6.

In the lubrication structure 1 shown in FIG. 5, the scavenging pump 6 directs the oil 7 sucked from the first chamber 8 directly to the second chamber 9 as in the lubrication structure 1 shown in FIG. It is configured to be discharged. Further, in the lubrication structure 1 shown in FIG. 6, the scavenging pump 6 discharges the oil 7 sucked from the first chamber 8 toward the rotating member 4, similarly to the lubrication structure 1 shown in FIG. Is configured.

As described above, in each of the lubricating structures 1 shown in FIGS. 5 and 6, the oil receiver 50 is formed above the rotating member 4 in the vertical direction. The oil receiver 50 is the oil 7 sucked from the second chamber 9 by the feeding pump 5, or the oil 7 sucked from the second chamber 9 by the feeding pump 5 and the oil sucked from the first chamber 8 by the scavenging pump 6. 7 is temporarily stored. Then, the stored oil 7 is dropped by the action of gravity to supply the oil 7 to the rotating member 4. Therefore, between the feeding pump 5 and/or the scavenging pump 6 and the oil receiver 50, it is not necessary to pump the oil 7 at a high pressure, and the oil 7 can be sent at a pressure as low as the discharge pressure of the pump. Therefore, the pumping loss of the feeding pump 5 and/or the scavenging pump 6 can be suppressed, and the transmission efficiency of the power transmission device 2 can be improved.

DESCRIPTION OF SYMBOLS 1... Lubrication structure, 2... Power transmission device, 3... Case (of power transmission device 2), 4... Rotating member (of power transmission device 2), 5... Feeding pump (O/P), 6... Scavenging pump (O/P), 7... Oil, 8... First chamber, 9... Second chamber, 10... Partition, 11... Gear (GEAR: rotating member, transmission rotating element), 12... Bearing (BRG: rotating member, transmission) Rotating element), 13... Motor (MG: rotating member), 14... Transmission rotating element, 15... First oil pump (O/P: feeding pump), 16... Second oil pump (O/P: feeding pump) ), 17, 18, 19, 31, 41... Strainer, 20... Oil passage, 21... Oil cooler (O/C), 22... Oil supply system (of first oil pump 15), 30... Oil pump (O/P) : Feeding pump), 32... (Oil pump 30) oil supply system, 40... Oil pump (O/P: scavenging pump), 42... (Oil pump 40) oil supply system, 50... Oil receiver.

Claims (6)

A power transmission device that includes a case in which oil is enclosed, a predetermined rotating member accommodated in the case, and a feeding pump that supplies the oil to the rotating member, and that lubricates and cools the rotating member with the oil. In the lubrication structure of
The case has a first chamber in which the rotating member is disposed and in which the rotating member rotates, and a second chamber which is separated from the first chamber and stores the oil separately from the first chamber. Then
The feeding pump sucks the oil stored in the second chamber and supplies the oil to the rotating member,
A lubricating structure for a power transmission device, comprising: a scavenging pump that sucks the oil that has flowed into the first chamber and discharges the oil from the first chamber.
The lubrication structure for a power transmission device according to claim 1,
The scavenging pump discharges the oil sucked from the first chamber toward the second chamber, the lubricating structure of the power transmission device.
The lubrication structure for a power transmission device according to claim 1,
The lubricating structure for a power transmission device, wherein the scavenging pump discharges the oil sucked from the first chamber toward the rotating member.
The lubrication structure for the power transmission device according to claim 1,
The rotating member has a motor that functions as at least one of a prime mover and a generator, and a transmission rotating element that participates in power transmission in the power transmission device separately from the motor,
The feeding pump includes a first oil pump that supplies the oil sucked from the second chamber to the motor, and a second oil pump that supplies the oil sucked from the second chamber to the transmission rotary element. A lubrication structure for a power transmission device, which has:
The lubrication structure for a power transmission device according to claim 4,
An oil cooler for cooling the oil is provided,
A lubricating structure for a power transmission device, characterized in that the oil sucked by the first oil pump is cooled by the oil cooler and supplied to the motor.
The lubrication structure for a power transmission device according to claim 1,
An oil receiver that is located vertically above the rotating member and stores the oil sucked by at least one of the feeding pump and the scavenging pump,
A lubricating structure for a power transmission device, characterized in that the oil stored in the oil receiver is dropped from the oil receiver and supplied to the rotating member.

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