JP2009210082A - Lubricating structure of power transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating structure of a power transmission capable of supplying an appropriate amount of lubricating oil to the surroundings of a gear on a differential shaft to scrape up the lubricating oil. <P>SOLUTION: In this lubricating structure applied to the power transmission 1 in which a counter shaft 6 is disposed in the lower part of an input shaft 3, a differential shaft 5 is disposed on their lateral side, and a counter gear 12 and a differential ring gear 14 rotate in a mutually receding direction, lubricating oil is scraped up by the differential ring gear 14 to lubricate each part in a case 2. In this case 2, a differential chamber 32 to house the differential gear 14, a counter chamber 33 to house the counter gear 12, and an oil reservoir 39 to store lubricating oil are provided, the differential chamber 32 and the counter chamber 33 are divided by the rib 34 of the case 2 so that a difference is produced between the dynamic oil level Lv1 and Lv2 between the differential chamber 32 and the counter chamber 33, and the oil reservoir 39 is connected to the differential chamber 32 by a connecting path 40 having a throttling action. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lubrication structure applied to a power transmission device such as a vehicle.

  As a power transmission device for a vehicle, a device is known in which a counter shaft and a differential shaft are disposed below an input shaft, and rotation of the input shaft is transmitted to the differential shaft via the counter shaft (see, for example, Patent Document 1). . In addition, Patent Documents 2 and 3 exist as prior art documents related to the present invention.

JP 2002-274201 A JP-A-9-226394 Japanese Utility Model Publication No. 61-184159

  In the power transmission device described above, lubrication is performed by scooping up the lubricating oil in the case with the gear on the differential shaft. However, if the rotation directions of the differential shaft and the counter shaft are set in opposite directions, the gear on the counter shaft scrapes out the lubricating oil in the opposite direction to the gear on the differential shaft. As a result, a sufficient amount of lubricating oil may not be supplied around the gear on the differential shaft. On the other hand, when the amount of lubricating oil in the case is increased in order to suppress the influence of the gear on the counter shaft, an excessive amount of lubricating oil stays around the gear on the differential shaft and the stirring loss increases. There is a fear.

  Therefore, an object of the present invention is to provide a lubricating structure of a power transmission device that can supply an appropriate amount of lubricating oil around a gear on a differential shaft that scoops up the lubricating oil.

  In the lubricating structure of the power transmission device according to the present invention, the counter shaft is disposed below the input shaft in the case, and the differential shaft is disposed on the side of the counter shaft, and the rotation direction of the counter shaft and the differential shaft is determined. The power transmission device is applied to a power transmission device set so as to be separated from each other in a region below the rotation center of each shaft, and the lubricating oil is scraped up by a gear on the differential shaft to lubricate each part in the case. In the lubrication structure, the case includes a differential chamber that accommodates the gear on the differential shaft, a counter chamber that accommodates the gear on the counter shaft, and an oil reservoir for storing the lubricating oil dropped in the case. The differential chamber and the counter chamber are separated by a partition wall of the case so that a difference occurs in the dynamic oil level between the differential chamber and the counter chamber, and the oil reservoir and the counter chamber Between the full chamber, in which it is connected by communication paths having a throttling effect (claim 1).

  According to the lubricating structure of the present invention, even if the gear on the counter shaft scrapes the lubricating oil from the counter chamber in the direction opposite to the differential chamber, the partition wall prevents the lubricating oil from flowing out of the differential chamber into the counter chamber. Therefore, the dynamic oil levels of the two chambers, that is, the oil levels of the differential chamber and the counter chamber when the power transmission device is operated can be differentiated. Then, by optimizing the throttle action of the communication path, a sufficient amount of lubricating oil can be supplied from the oil reservoir to the differential chamber. Accordingly, it is possible to reduce the loss of stirring of the lubricating oil by the gear on the differential shaft while preventing the amount of the lubricating oil from being scraped up.

  In one form of the lubricating structure of the present invention, the partition wall is provided with an extension portion extending forward in the rotation direction of the gear on the counter shaft, and the oil reservoir is disposed between the extension portion and the counter portion. A recovery chamber for recovering the lubricating oil scraped out from the counter chamber by a gear on the counter shaft may be included on the opposite side of the chamber. According to this embodiment, the lubricating oil scraped out from the counter chamber by the gear on the counter shaft can be recovered in the recovery chamber and stored as the lubricating oil to be supplied to the differential chamber.

  In one embodiment in the case of providing a recovery chamber, the oil reservoir further includes a holding chamber that is separated from the recovery chamber by a partition in the case and connected to the recovery chamber through a connection path that penetrates the partition. (Claim 3). According to this embodiment, in addition to the recovery chamber, the holding chamber can also be used as a compartment for storing lubricating oil. By adjusting the cross-sectional area of the connection path, the dynamic oil level of the recovery chamber and the dynamic oil level of the holding chamber can be appropriately set.

  In an embodiment in which a recovery chamber and a holding chamber are provided in the oil reservoir, the recovery chamber and the differential chamber may be connected by the communication path (Claim 4). According to this aspect, the lubricating oil is supplied from the recovery chamber to the differential chamber, and accordingly, the lubricating oil flows from the holding chamber to the recovery chamber via the connection path. Therefore, by optimizing the throttle action of the connection path, the dynamic oil level of the recovery chamber is set to such an extent that insufficient supply of lubricating oil to the differential chamber does not occur, and excess lubricating oil is stored in the holding chamber. I can leave. As a result, it is not necessary to excessively extend the extending portion of the partition wall that separates the counter chamber and the recovery chamber, and the dynamic oil level in the counter chamber can be lowered to reduce the stirring loss of the gear on the counter shaft. .

  When the recovery chamber and the differential chamber are connected by a communication path, the connection path may be throttled so that the dynamic oil level of the holding chamber is higher than the dynamic oil level of the recovery chamber ( Claim 5). As a result, a sufficient amount of lubricating oil can be stored in the holding chamber.

  Furthermore, in the case where an oil pump for pumping up the lubricating oil is provided, a suction portion of the oil pump may be provided in the holding chamber (Claim 6). By storing a sufficient amount of lubricating oil in the holding chamber, it is possible to prevent the oil pump from sucking air.

  A communication path connecting the recovery chamber and the differential chamber may be provided so as to connect the recovery chamber and the differential chamber via the lower side of the partition wall. In this case, since the counter chamber is separated from the communication path using a partition wall which is a part of the case, the communication path can be provided relatively easily.

  In another embodiment in which a recovery chamber and a holding chamber are provided in the oil reservoir, the holding chamber and the differential chamber may be connected by the communication path (Claim 8). According to this aspect, the lubricating oil is supplied from the holding chamber to the differential chamber, and accordingly, the lubricating oil flows from the recovery chamber to the holding chamber through the connection path. Therefore, the recovery chamber can function as a reserve chamber for storing a necessary and sufficient amount of lubricating oil in the holding chamber.

  In the above embodiment, in the case where an oil pump for pumping up the lubricating oil is further provided, a suction portion of the oil pump may be provided inside either the holding chamber or the recovery chamber. In either case, the oil pump can be prevented from sucking air.

  In an embodiment in which a recovery chamber and a holding chamber are provided in the oil reservoir, the case has an assembly structure in which at least three case parts are combined in the axial direction of the input shaft, and the differential chamber, the counter chamber, and the recovery chamber Is provided in a region sandwiched between two case parts adjacent to each other, and the partition is provided between any one of the two case parts and another case part, and the partition is The holding chamber may be provided on the opposite side of the one case across the other side (claim 10). According to this embodiment, the differential chamber, the counter chamber, and the recovery chamber are arranged on one side with respect to the partition wall of the case part, and the holding chamber is positioned on the opposite side across the partition wall. As a result, the recovery chamber and the holding chamber can be clearly defined by the partition walls of the case parts while the lubricating oil scraped out from the counter chamber is easily recovered in the recovery chamber.

  In one form of the lubricating structure of the present invention, the communication path opens in a space surrounded by the outer periphery of the gear on the differential shaft, the outer periphery of the gear on the counter shaft, and the bottom of the case, and the space The may be provided with a magnet (claim 11). According to this aspect, foreign matter in the lubricating oil flowing from the oil reservoir to the differential chamber via the communication path can be adsorbed by the magnet. The space described above is a place where a relatively large amount of lubricating oil flows through the communication path, and therefore it is easy to capture foreign matter by providing a magnet there. Moreover, it is possible to arrange the magnet without effectively expanding the case downward by making effective use of the space. When the power transmission device is disposed at the lower part of the vehicle, the minimum ground clearance of the vehicle can be ensured by suppressing the downward protrusion of the case.

  In one form of the lubrication structure of the present invention, an oil catch tank that receives the lubricating oil scraped up by the gear on the differential shaft is further provided, and the lubricating oil dropped from the oil catch tank lubricates the inside of the case. And may be collected in the oil reservoir (claim 12). According to this aspect, it is possible to supply an appropriate amount of lubricating oil from the oil reservoir to the differential chamber while accumulating the lubricating oil falling from the oil catch tank in the oil reservoir.

  As described above, according to the lubricating structure of the present invention, since the partition wall is provided between the differential chamber and the counter chamber in the case, the gear on the counter shaft scrapes the lubricating oil from the counter chamber. However, there is no possibility that the lubricating oil flows out from the differential chamber to the counter chamber. By optimizing the throttle action of the communication path, lubricating oil can be supplied from the oil reservoir to the differential chamber without excess or deficiency. Accordingly, it is possible to reduce the loss of stirring of the lubricating oil by the gear on the differential shaft while preventing the amount of the lubricating oil from being scraped up.

[First embodiment]
FIG. 1 is a cross-sectional view showing an internal structure of a vehicle power transmission device to which a lubricating structure according to a first embodiment of the present invention is applied, and FIG. 2 is a cross-sectional view taken along the counter axis of the power transmission device. In addition, the up-down direction in a figure corresponds with the up-down direction in the state mounted in the vehicle. Hereinafter, prior to the lubrication structure, a schematic configuration of the power transmission device will be described.

  As shown in FIGS. 1 and 2, the power transmission device 1 includes a case 2 and an input shaft 3, an MG shaft 4, a differential shaft 5, and a counter shaft 6 disposed in the case 2. The input shaft 3 is connected coaxially to an output shaft of an internal combustion engine (hereinafter abbreviated as an engine) mounted as a power source in a vehicle, for example. The MG shaft 4 is an input / output shaft of a motor generator MG1 that generates torque that compensates for a shortage of engine output, or that generates power with a surplus of engine output. On the input shaft 3, another motor generator MG2 is arranged. Torque is transmitted between the input shaft 3 and the MG shaft 4 via the gears 10 and 11. The rotation of the input shaft 3 is transmitted from the gear 10 on the input shaft 3 to the counter gear 12 on the counter shaft 6, and further transmitted from the intermediate gear 13 on the counter shaft 6 to the diff ring gear 14 on the differential shaft 5. . The rotation of the differential shaft 5 is transmitted to the drive wheels of the vehicle via a differential device (not shown).

  The arrangement of the axes 3 to 6 is as follows. With the input shaft 3 as a reference, the MG shaft 4 is disposed obliquely above and the counter shaft 6 is disposed obliquely below. The differential shaft 5 is disposed on the side of the counter shaft 6. The counter shaft 6 is positioned below an imaginary line L1 connecting the rotation center C3 of the input shaft 3 and the rotation center C5 of the differential shaft 5. The rotation directions of the shafts 3 to 6 are as indicated by arrows A3 to A6 in the drawing. Each of the differential shaft 5 and the counter shaft 6 rotates in a direction away from each other in a region below the rotation centers C5 and C6. That is, the differential shaft 5 rotates to the left in FIG. 1 below the rotation center C5, and the counter shaft 6 rotates to the right in FIG. 1 below the rotation center C6. In addition, the rotation direction of illustration is a thing at the time of advance of a vehicle.

  As is clear from FIG. 2, the case 2 is an assembly in which the first case component 21, the second case component 22, and the third case component 23 are combined at boundaries B <b> 1 and B <b> 2 in the axial direction of the input shaft 3. Structure. One end surface (right end surface in FIG. 2) 21a of the first case component 21 is joined to the engine, and a torsion damper 24 and the like that should be interposed between the engine output shaft (crankshaft) and the input shaft 3 are disposed in the inside. The components are housed. A motor generator MG2 (see FIG. 1) to be arranged coaxially with the input shaft 3 is also arranged in the first case component 21. Between the first case component 21 and the second case component 22, the gear 10, the counter gear 12, the intermediate gear 13, and the diff ring gear 14 described above are accommodated. In FIG. 2, a counter shaft 6, a counter gear 12, and an intermediate gear 13 are shown, and both ends of the counter shaft 6 are rotatably supported by bearings 15A and 15B.

  FIG. 3 is a perspective view showing a state in which the second case component 22 is viewed from the joint surface side with respect to the first case component 21, and FIG. 4 is a joint surface side of the second case component 22 with respect to the third case component 23. FIG. 5 is a perspective view showing a state in which the third case component 23 is seen from the joint surface side with respect to the second case component 22. However, in these drawings, a part of the case part is illustrated in a simplified manner as compared with FIG. Hereinafter, in the second case component 22, the side to be joined to the first case component 21 (that is, the side shown in FIG. 3) is the front side, and the side to be joined to the third case component 23 ( That is, the side shown in FIG. 4 is referred to as the back side.

  As shown in FIG. 3, the second case component 22 is provided with a partition wall 25 that partitions the inside of the case 2. On the surface side of the partition wall 25, an MG shaft hole 26 for passing the MG shaft 4, a differential shaft hole 27 for passing the differential shaft 5, and a bearing 15A (see FIG. 2) at the shaft end of the counter shaft 6 are provided. A shaft mounting portion 28 for mounting is provided. The shaft attachment portion 28 does not penetrate the partition wall 25. On the other hand, as shown in FIG. 4, an MG chamber 29 for accommodating the motor generator is provided on the back surface side of the second case component 22. The input shaft 3 passes through the partition wall 30 (see FIG. 2) of the first case part 21 and is inserted into the second case part 22, but the tip does not reach the partition wall 25. For this reason, the second case component 22 does not have a through hole for passing the input shaft 3 or a shaft mounting portion for mounting the input shaft 3. As shown in FIG. 5, the third case component 23 has a shape as a lid that seals the back surface side of the second case component 22, and a shaft mounting portion for mounting the MG shaft 4 on the inner surface side thereof. 23a is provided. The shaft attachment portion 23 a does not penetrate the third case component 23.

  Next, the lubricating structure of the power transmission device 1 will be described. As shown in FIGS. 1 and 3, an oil catch tank 31 is formed integrally with the upper portion of the surface side of the second case component 22. Inside the case 2, more specifically, in a region sandwiched between the partition wall 30 of the first case component 21 and the partition wall 25 of the second case component 22, a differential chamber 32 that houses the differential ring gear 14, a counter A counter chamber 33 for housing the gear 12 is provided. Ribs 34 as partition walls are provided on the surface side of the second case part 22 so as to extend along the outer periphery of the lower portion of the counter gear 12. As is clear from FIG. 2, the tip end of the rib 34 is abutted against the partition wall 30 of the first case component 21 in the assembled state of the case 2. The ribs 34 divide the differential chamber 32 and the counter chamber 33 so that there is a difference between the dynamic oil levels Lv1 and Lv2. The dynamic oil level is the level of the lubricating oil when the power transmission device 1 is operating. Incidentally, the static oil level Lv0 when the power transmission device 1 is stopped is located sufficiently higher than the ribs 34.

  The inner peripheral surface of the differential chamber 32 is formed in a shape curved in an arc along the outer periphery of the differential ring gear 14. As indicated by an arrow S <b> 1 in FIG. 1, the lubricating oil accumulated in the differential chamber 32 is scraped up along with the rotation of the differential ring gear 14 and sent to the oil catch tank 31. From the oil catch tank 31, lubricating oil is dropped at an appropriate flow rate toward the lubrication location in the case 2. As a lubrication location, there exists a meshing part of gears 10-14. Part of the lubricating oil stored in the oil catch tank 31 is guided to the back side of the partition wall 25 and used for lubrication in the MG chamber 29.

  The rib 34 has an extension 34 a that extends forward in the rotational direction of the counter gear 12 (in the direction opposite to the differential chamber 32). The lubricating oil accumulated on the ribs 34 is scraped out by the counter gear 12 toward the extension portion 34a. A recovery chamber 36 that functions as a part of an oil reservoir is provided at a position opposite to the counter chamber 33 across the extension 34a. The collection chamber 36 functions as a section for collecting a part of the lubricating oil dropped from the oil catch tank 31 and collecting the lubricating oil scraped out in the arrow S2 direction by the counter gear 12. As shown in FIG. 2, a strainer chamber 37 as a holding chamber is provided between the second case component 22 and the third case component 23, that is, below the MG chamber 29. The strainer chamber 37 functions as a section for collecting the lubricating oil used for lubricating the MG chamber 29.

  As shown in FIGS. 1, 3 and 4, the partition wall 25 is formed with a connection path 38 extending therethrough. The strainer chamber 37 and the recovery chamber 36 are connected to each other via the connection path 38. Thereby, the collection chamber 36 and the strainer chamber 37 function as an oil reservoir 39 that stores lubricating oil (see FIG. 6). The cross-sectional area of the connection path 38 is adjusted so as to produce a throttling action that maintains the dynamic oil level Lv4 of the strainer chamber 37 higher than the dynamic oil level Lv3 of the recovery chamber 36. Furthermore, the recovery chamber 36 and the differential chamber 32 are connected via a communication path 40 provided below the rib 34. The connecting path 40 is formed so as to be surrounded by the rib 34, the partition walls 30 and 25 of the case parts 21 and 22, and the bottom 22 a of the case part 22. Thus, since the connection path 40 is comprised using the case components 21 and 22, the connection path 40 can be provided, without adding a component and machining.

  The cross-sectional area of the communication path 40 is adjusted so as to produce a throttling action that maintains the dynamic oil level Lv3 of the recovery chamber 36 higher than the dynamic oil level Lv1 of the differential chamber 32. As indicated by an arrow F in FIG. 1, the lubricating oil stored in the recovery chamber 36 is supplied to the differential chamber 32 via the communication path 40. Furthermore, in the strainer chamber 37, a strainer 43 that constitutes a suction portion of an oil pump (not shown in FIGS. 1 and 2) is disposed.

  As shown in FIG. 1, the connecting path 40 opens to a substantially triangular space SP surrounded by the diff ring gear 14, the counter gear 12, and the bottom 22 a of the second case part 22. A magnet chamber 44 is formed on the bottom 22 a of the second case component 22 so as to be adjacent to the opening of the communication path 40 on the differential chamber 32 side. A permanent magnet 45 is accommodated in the magnet chamber 44. The magnet 45 is provided to adsorb foreign matter in the lubricating oil flowing from the recovery chamber 36 to the differential chamber 32 via the communication path 40. Since the space SP is a place through which a relatively large amount of lubricating oil flows through the communication path 40, it is easy to capture foreign matter by providing the magnet 45 there. In addition, the space 45 can be effectively used to arrange the magnet 45 without expanding the case 2 downward. Since the power transmission device 1 is usually disposed in the lower part of the vehicle, it is advantageous to secure the minimum ground clearance of the vehicle by suppressing the downward projection of the case 2.

  FIG. 6 is a diagram schematically showing the lubrication structure of this embodiment, and the same reference numerals are assigned to the components corresponding to FIGS. 1 to 5 described above. Note that the lubrication points such as the gears 10 and 11 shown in FIGS. Further, FIG. 6 shows a pump 42 that sucks lubricating oil from the strainer 43. As indicated by a broken line in FIG. 6, the lubricating oil is scraped up from the differential chamber 32 to the oil catch tank 31 and temporarily stored therein. From the oil catch tank 31, the lubricating oil falls at an appropriate flow rate toward the lubrication point 46 and the motor generators MG1 and MG2. The lubricating oil supplied to the lubrication point 46 falls into the differential chamber 32, the counter chamber 33, and the recovery chamber 36. Lubricating oil supplied to motor generator MG1 falls into recovery chamber 36, and lubricating oil supplied to motor generator MG2 falls into strainer chamber 37. Lubricating oil stored in the recovery chamber 36 is supplied to the differential chamber 32 via the communication path 40. Along with the supply operation, the lubricating oil flows from the strainer chamber 37 to the recovery chamber 36 through the connection path 38.

  In the lubrication structure of this embodiment, the dynamic oil level Lv1 of the differential chamber 32 is limited to be lower than the dynamic oil level Lv3 of the recovery chamber 36 by the throttle action of the communication path 40. 32 can be supplied with a sufficient amount of lubricating oil. Accordingly, it is possible to reduce agitation loss caused by the diffring gear 14 while preventing poor lubrication due to an insufficient amount of lubricating oil scraped up by the diffring gear 14. Further, since the dynamic oil level Lv4 of the strainer chamber 37 is maintained higher than the dynamic oil level Lv3 of the recovery chamber 36 by the throttling action of the connection path 38, a sufficient amount of lubricating oil is stored in the strainer chamber 37. Further, the air suction of the oil pump 42 can be prevented. Moreover, since the dynamic oil level Lv3 in the recovery chamber 36 is maintained lower than the dynamic oil level Lv4 in the strainer chamber 37, the lubricating oil hardly flows back from the recovery chamber 36 to the counter chamber 33. Therefore, the height of the extended portion 34a of the rib 34 can be suppressed, and thereby the dynamic oil level Lv2 of the counter chamber 33 can be set as low as possible and the stirring loss due to the counter gear 12 can also be suppressed. When cold, the viscosity of the lubricating oil is high, and the squeezing action of each of the connecting path 38 and the connecting path 40 becomes relatively large, and the lubricating oil is more difficult to return to the differential chamber 32. Therefore, the transmission efficiency of the power transmission device 1 can be increased by further suppressing the stirring loss of the diff ring gear 14 during cold.

[Second form]
Next, a lubricating structure according to a second embodiment of the present invention will be described with reference to FIGS. The lubrication structure of this embodiment is obtained by changing a part of the first embodiment, and the power transmission device to which the lubrication structure is applied has the same configuration as that shown in FIGS. Therefore, in FIGS. 7 to 10, the same parts as those in the first embodiment are denoted by the same reference numerals as those in FIGS. 1 to 6 and the description thereof is omitted. 7 corresponds to FIG. 1, FIG. 8 corresponds to FIG. 3, FIG. 9 corresponds to FIG. 4, and FIG. 10 corresponds to FIG. In FIG. 1, the reference numeral of the corresponding component is indicated with a suffix A. Regarding FIG. 2 and FIG. 5, since the changed portion does not appear, these are used. However, the components with the subscript A in FIGS. 7 to 10 are used with the subscript A attached to the reference numerals of the corresponding components in FIG.

  In this embodiment, the rib 50 is provided between the rib 34 and the bottom 22a of the second case component 22A constituting the case 2A, so that the space between the differential chamber 32 and the collection chamber 36 is closed. Instead, the second case part 22A is provided with a communication path 40A that penetrates the partition wall 25 so as to connect the strainer chamber 37 and the differential chamber 32. The cross-sectional area of the communication path 40 </ b> A is adjusted so as to produce a throttling action that maintains the dynamic oil level Lv <b> 4 of the strainer chamber 37 higher than the dynamic oil level Lv <b> 1 of the differential chamber 32. The communication path 40A is open to the space SP as in the first embodiment. The cross-sectional area of the connection path 38A connecting the recovery chamber 36 and the strainer chamber 37 is such that the dynamic oil level Lv3 of the recovery chamber 36 and the dynamic oil level Lv4 of the strainer chamber 37 are substantially equal. It is set larger than that of the connection path 38 of the form. Along with this, the extension 34a of the rib 34 is extended somewhat forward in the rotational direction of the counter gear 12 as compared with that of the first embodiment.

  Next, the flow of lubricating oil in the second embodiment will be described with reference to FIG. As indicated by a broken line in FIG. 10, in this embodiment as well, the lubricating oil scraped up from the differential chamber 32 to the oil catch tank 31 is directed from the oil catch tank 31 to the lubrication point 46 and the motor generators MG1 and MG2. The lubricating oil dropped at an appropriate flow rate and supplied to the lubrication point 46 falls into the differential chamber 32, the counter chamber 33 and the recovery chamber 36. Lubricating oil supplied to motor generator MG1 falls into recovery chamber 36, and lubricating oil supplied to motor generator MG2 falls into strainer chamber 37. The lubricating oil stored in the strainer chamber 37 is supplied to the differential chamber 32 via the communication path 40A, and the lubricating oil flows from the recovery chamber 36 to the strainer chamber 37 via the connection path 38 in accordance with the supply action.

  According to this embodiment, the lubricant oil is supplied from the strainer chamber 37 which is a part of the oil reservoir 39 to the differential chamber 32 via the communication path 40A, thereby supplying the differential chamber 32 with a sufficient amount of lubricating oil. As a result, it is possible to reduce agitation loss due to the diffring gear 14 while preventing lubrication failure due to insufficient amount of lubricating oil scraped up by the diffring gear 14. When cold, the viscosity of the lubricating oil is high, the throttle action of the communication path 40A is relatively large, and the lubricating oil is more difficult to return to the differential chamber 32. Therefore, the transmission efficiency of the power transmission device 1 can be increased by further suppressing the stirring loss of the diff ring gear 14 during cold. Lubricating oil is supplied from the recovery chamber 36 to the strainer chamber 37 while maintaining the dynamic oil levels Lv3 and Lv4 of the recovery chamber 36 and the strainer chamber 37 substantially equal to each other. It can function as a spare chamber for maintaining the amount to prevent the oil amount in the strainer chamber 37 from being insufficient, thereby preventing the oil pump 42 from sucking air. In the second embodiment, a strainer 43 may be installed in the collection chamber 36 instead of or in addition to the strainer chamber 37.

  This invention is not limited to the form mentioned above, It can implement with a various form. For example, the lubrication structure of the present invention is sufficient if it has a structure in which lubricating oil is scooped up and lubricated by a gear on the differential shaft, and can be applied to a structure without a catch tank. The magnet for capturing foreign matter can be omitted if unnecessary. The configuration of the case is not limited to the above example, and appropriate modifications are possible. The communication path and the connection path are not limited to an example in which a part of the case part is used, and a part or all of the connection path and the connection path may be configured by piping. The oil reservoir is not limited to a configuration having one collection chamber and one holding chamber, but may be configured as a single chamber or additional chambers may be added. The shaft configuration of the power transmission device to which the present invention is applied is that the counter shaft is present below the input shaft, the differential shaft is present on the side of the counter shaft, and the rotation directions of the counter shaft and the differential shaft are the rotation centers thereof. As long as it is set so as to move away from each other in the lower region, it may be changed as appropriate. For example, the lubricating structure of the present invention can be applied to a power transmission device that does not have a motor generator.

Sectional drawing which shows the internal structure of the power transmission device for vehicles to which the lubrication structure which concerns on the 1st form of this invention was applied. Sectional drawing along the counter axis line of a power transmission device. The perspective view which shows the state which looked at the 2nd case component from the joint surface side with respect to a 1st case component. The perspective view which shows the state which looked at the 2nd case component from the joint surface side with respect to a 3rd case component. The perspective view which shows the state which looked at the 3rd case component from the joint surface side with respect to a 2nd case component. The figure which showed typically the lubrication structure of a 1st form. Sectional drawing which shows the internal structure of the power transmission device for vehicles to which the lubrication structure which concerns on the 2nd form of this invention was applied. The perspective view which shows the state which looked at the 2nd case component in the 2nd form from the same direction as FIG. The perspective view which shows the state which looked at the 2nd case component in the 2nd form from the same direction as FIG. The figure which showed the lubrication structure of the 2nd form typically.

Explanation of symbols

1 Power transmission device 2, 2A Case 3 Input shaft 4 MG shaft 5 Differential shaft 6 Counter shaft 12 Counter gear (gear on counter shaft)
14 Differential ring gear (gear on differential shaft)
21 First case parts 22, 22A Second case part 22a Bottom part of second case part 23 Third case part 25 Bulkhead 31 Oil catch tank 32 Differential chamber 33 Counter chamber 34 Rib (partition wall)
34a Extension part 36 Collection room 37 Strainer room (holding room)
38, 38A Connection path 39 Oil reservoir 40, 40A Connection path 42 Oil pump 43 Strainer (suction section)
44 Magnet chamber 45 Permanent magnet C3 Center of rotation of input shaft C5 Center of rotation of differential shaft C6 Center of rotation of counter shaft Lv0 Static oil level Lv1 Dynamic oil level of differential chamber Lv2 Dynamic oil level of counter chamber Lv3 Movement of recovery chamber Oil level Lv4 Strainer room dynamic oil level SP space

Claims (12)

In the case, a counter shaft is disposed below the input shaft, and a differential shaft is disposed on the side of the counter shaft. The counter shaft and the differential shaft rotate in a region below the rotation center of each shaft. In a lubricating structure of a power transmission device that is applied to a power transmission device set so as to move away, and that lubricates the inside of the case by scooping up lubricating oil by a gear on the differential shaft,
In the case, there are provided a differential chamber for storing the gear on the differential shaft, a counter chamber for storing the gear on the counter shaft, and an oil reservoir for storing lubricating oil dropped in the case,
The differential chamber and the counter chamber are separated by a partition wall of the case so that a difference occurs in the dynamic oil level between the differential chamber and the counter chamber,
A lubricating structure for a power transmission device, wherein the oil reservoir and the differential chamber are connected by a communication path having a throttle action.   The partition wall is provided with an extension extending forward in the rotational direction of the gear on the counter shaft, and the oil reservoir is located on the opposite side of the counter chamber with the extension interposed therebetween, The lubricating structure according to claim 1, further comprising a recovery chamber for recovering the lubricating oil scraped from the counter chamber by a gear on the counter shaft.   The lubricating structure according to claim 2, wherein the oil reservoir further includes a holding chamber that is separated from the recovery chamber by a partition in the case and is connected to the recovery chamber through a connection path that penetrates the partition.   The lubrication structure according to claim 3, wherein the recovery chamber and the differential chamber are connected by the communication path.   The lubricating structure according to claim 4, wherein the connecting path is provided with a throttle action so that a dynamic oil level in the holding chamber is higher than a dynamic oil level in the recovery chamber.   The lubricating structure according to claim 5, further comprising an oil pump that pumps up the lubricating oil, wherein a suction portion of the oil pump is provided in the holding chamber.   The lubrication structure according to any one of claims 4 to 6, wherein the communication path is provided so as to connect the recovery chamber and the differential chamber via a lower side of the partition wall.   The lubricating structure according to claim 3, wherein the holding chamber and the differential chamber are connected by the communication path.   The lubricating structure according to claim 8, further comprising an oil pump that pumps up the lubricating oil, wherein a suction portion of the oil pump is provided inside either the holding chamber or the recovery chamber.   The case has an assembly structure in which at least three case parts are combined in the axial direction of the input shaft, and the differential chamber, the counter chamber, and the recovery chamber are sandwiched between two adjacent case parts. The partition is provided between one of the two case parts and the other case part, and the holding chamber is provided on the opposite side of the one case across the partition. The lubrication structure as described in any one of Claims 3-9.   2. The communication path opens in a space surrounded by the outer periphery of the gear on the differential shaft, the outer periphery of the gear on the counter shaft, and the bottom of the case, and a magnet is provided in the space. The lubricating structure according to any one of 10 to 10.   The oil catch tank which receives the lubricating oil scraped up by the gear on the differential shaft is further provided, and the lubricating oil dropped from the oil catch tank is lubricated in the case and collected in the oil reservoir. The lubricating structure as described in any one of -11.

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