JP4992803B2 - Fluid passage structure of power transmission device - Google Patents

Description

  The present invention relates to a fluid passage structure of a power transmission device, and more particularly, to a fluid passage structure of a power transmission device in which fluid such as lubricating oil in a case is circulated upward by a transmission element such as a gear.

  In a power transmission device for a vehicle, for example, a power transmission device such as a transaxle structure in which a differential mechanism is incorporated in a transmission case, lubricating oil is supplied from an inner bottom portion of the transmission case using a large rotational transmission element such as a differential ring gear. Some fluids (lubricating / cooling fluid) are raked up and circulated.

As a conventional power transmission device for this type of vehicle, for example, lubricating oil pumped up from the inner bottom side of the case by a differential ring gear is introduced into a catch tank located on the upper side in the case, and the catch tank is temporarily In this case, the lubricating oil is gradually flown down along a predetermined lubrication / cooling path, thereby effectively reducing the load on the large gear during operation and the like, and lubricating the operating parts and cooling the heat generating parts. What was made is known (for example, refer patent document 1).
JP 2007-57093 A

  However, in the conventional power transmission device as described above, the shape of the fluid introduction passage for introducing the lubricating oil pumped up from the inner bottom side of the case by the differential ring gear into the catch tank is narrow at the opening portion at the upstream end. Therefore, there was a problem that the pumped-up lubricating oil could not be sufficiently introduced into the catch tank side.

  That is, at the inlet portion of the fluid introduction passage that introduces the lubricated oil into the catch tank, the downstream passage is configured to prevent the lubricant introduced into the fluid introduction passage from flowing backward from the introduction port. There were provided weir-like backflow prevention ribs located above the bottom wall surface. Therefore, when the passage width is narrow due to the case size restriction, the opening (inlet port) for introducing the lubricating oil becomes narrow because it is necessary to set the backflow prevention rib, which is suitable for the operating state of the power transmission device. It has been difficult to ensure a sufficient amount of cooling fluid to be introduced.

  The present invention has been made to solve the above-described conventional problems, and even when the size of the case is restricted, the backflow prevention function can be exhibited and the operating state of the power transmission device can be maintained. It is an object of the present invention to provide a fluid passage structure of a power transmission device that can ensure a suitable and sufficient fluid introduction amount.

In order to achieve the above object, the fluid passage structure of the power transmission device according to the present invention includes (1) a lubricating or cooling fluid stored in a case formed in the case by a transmission element built in the case. In the fluid passage structure of the power transmission device, the fluid introduction passage is raked up by the transmission element in the fluid passage structure in which the fluid is circulated in the case through the fluid introduction passage. An inlet for introducing the fluid, a downstream passage part for allowing the fluid introduced from the inlet to flow down to the transmission element side, and the inlet and the downstream part located between the inlet and the downstream passage part anda widened widened passage portion as passage cross-sectional area increases from the side passage portion, widening the passage forming part of the case forming the widening passage portion, said inlet An upstream inclined surface positioned on the lower side as the inner bottom wall surface enters the fluid introduction passage from the introduction port in the vicinity of the introduction port; A curved shape having a downstream inclined surface that is continuous with the upstream inclined surface and that is located on the upper side as the distance from the introduction port side increases .

  With this configuration, since the fluid introduction passage has the widened passage portion that is widened so that the passage cross-sectional area is larger than the introduction port and the downstream passage portion, the fluid pumped up into the fluid introduction passage by the transmission element is The flow causes a vortex in the fluid in the widened passage portion to flow to the downstream portion of the fluid introduction passage, and the backflow of the fluid from the introduction port to the outside of the fluid introduction passage hardly occurs. The cross-sectional area of the passage here is a cross-sectional area perpendicular to the extending direction of the fluid introducing passage, and when the introducing port is inclined with respect to the extending direction, the cross-sectional area of the introducing port is The cross-sectional area of the peripheral portion of the introduction port is a portion close to the widened passage portion. The fluid may be not only a liquid for lubrication or cooling but also a fluid containing a liquid or a solid component.

In the present invention, the widening passage forming portion of the case that forms the widening passage portion has a concave shape having an inner bottom wall surface below the introduction port, so that it is scraped up into the fluid introduction passage by the transmission element. by the flow of fluid, dents fluid flows to the downstream side in the upper fluid accumulated in the widening passage forming part of the shape, will be vertical vortex is generated in the widened passage portion, backflow of the fluid becomes less likely to occur. In addition, since the inner bottom wall surface has a curved shape having an upstream inclined surface and a downstream inclined surface, even if a flow in the reverse flow direction occurs, the flow is folded back in the fluid introduction direction. Is less likely to occur.

In the fluid passage structure of the power transmission device of the present invention having the above configuration , (2) the passage cross-sectional areas of the introduction port and the downstream passage portion are preferably equal.

  With this configuration, the fluid introduction port does not become narrower than the downstream portion of the fluid introduction passage, and even when the size of the case is limited, it is sufficient for the operating state of the power transmission device. It is easy to secure a sufficient amount of fluid to be introduced.

In the fluid passage structure of the power transmission device having the configuration described in (1) and (2) above, (3) the case introduces the fluid pumped up by the transmission element through the fluid introduction passage, and temporarily It is preferable to have a catch tank for storing in the tank.

  With this configuration, the fluid pumped up from the inner bottom side of the case by the transmission element is introduced into the catch tank by the fluid introduction passage and temporarily stored in the tank, so that the fluid is gradually lubricated in advance. While rotating the stored fluid, the rotational load such as large gears that scoop up and stir the stored fluid is effectively reduced, while lubrication of each operating part and cooling of the heat generating part are ensured. Will be.

In the fluid passage structure of the power transmission device having the configuration described in (1) to (3) above, (4) the transmission element is preferably a gear.

  With this configuration, the pumping of the fluid from the bottom side of the case is stably executed, and the pumping amount changes in accordance with the rotation speed of the gear, so that the required lubrication and cooling can be performed. Become.

In the fluid passage structure of the power transmission device having the configuration described in (4) above, (5) the power transmission device includes a transmission mechanism for a vehicle and a differential mechanism, and the transmission element includes the differential mechanism. Even a ring gear that is externally mounted is preferable.

  With this configuration, the fluid is effectively pumped up by the ring gear of the differential mechanism having a high peripheral speed, and a sufficient amount of fluid introduced suitable for the operating state of the power transmission device can be ensured.

  According to the present invention, the fluid introduction passage is provided with the widened passage portion widened so that the cross-sectional area of the passage is larger than that of the introduction port and the downstream passage portion, and the flow of the fluid pumped up into the fluid introduction passage by the transmission element While the vortex is generated in the fluid accumulated in the widening passage portion, the fluid flows to the downstream portion of the fluid introduction passage, so that it is difficult to cause a back flow of the fluid from the introduction port to the outside of the fluid introduction passage. The fluid passage of the power transmission device can exhibit a backflow prevention function even when the case size is restricted, and can ensure a sufficient amount of fluid introduction suitable for the operating state of the power transmission device Structure can be provided.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 to 5 are diagrams showing a vehicle power transmission device according to an embodiment of the present invention, showing an example in which the present invention is applied to a power transmission device for a front drive of a four-wheel drive vehicle. 1 is a side view of the case showing a state in which a planetary gear mechanism in which a counter drive gear is integrated and a counter driven gear are fitted in one case in the embodiment, and FIG. 2 is a side view of FIG. FIG. 3 is a partially enlarged view showing a principal part of FIG. 1 in an enlarged manner. 4 and 5 are explanatory diagrams of the flow of the lubricating oil in the main part of the vehicle power transmission device according to the embodiment.

  First, the configuration will be described. As shown in FIGS. 1 and 2, the vehicle power transmission device of the present embodiment includes a planetary gear mechanism that forms a transmission mechanism in a case 11 that forms part of the transmission case 10. 20 and a differential mechanism 30 capable of differential output to the left and right drive shafts 31 and 32, and a transaxle type that is equipped with motor type drive means 40 that drives the input element of the planetary gear mechanism 20. is there. The motor-type drive means 40 includes a drive motor 41 (one motor) located on one end side of the case 11 and a motor generator 42 (the other motor) that can generate electric power from the power from the engine. ing.

  As shown in FIG. 2, a cover 12 is liquid-tightly attached to one end side (left end side in the figure) of the case 11, and finally, the other end side of the case 11 is fastened and supported on the engine block side. The housing 13 to be done is fastened. The housing 13 is partitioned by the cover 14 into a housing portion for the motor generator 42 and a housing portion for the damper element 5 serving as a driving force transmission mechanism from the engine. The case 11, the covers 12 and 14, and the housing 13 constitute a transmission case 10.

  The planetary gear mechanism 20 has a first planetary gear mechanism portion 21 for output reduction of the drive motor 41 and a second power distribution function that distributes power from the engine side to the motor generator 42 and the counter drive gear 23. The first planetary gear mechanism portion 21 and the second planetary gear mechanism portion 22 are counter elements that are output elements in the ring gear portion (not indicated in the drawing) on the outer peripheral side. It is integrated with the drive gear 23.

  Although not shown in FIG. 2, the first planetary gear mechanism 21 includes a sun gear (input element) splined to the rotor 41a of the drive motor 41, and an internal ring gear that surrounds the sun gear. , A plurality of pinions provided at equal circumferential intervals around the sun gear, that is, at equal angular intervals, and meshing with the sun gear and the ring gear, and a carrier (fixed element) that rotatably supports the plurality of pinions at a predetermined revolving radius position And is composed of. The second planetary gear mechanism 22 includes a sun gear splined to the rotor 42a of the motor generator 42, an internal ring gear that surrounds the sun gear, and a sun gear and a ring gear provided around the sun gear at equal intervals in the circumferential direction. And a carrier (reaction element) that supports the plurality of pinions so as to be able to rotate and is fixed to the input shaft 1 or integrally connected in the rotational direction.

  One end portion of the counter drive gear 23 integrated with the ring gears of the first planetary gear mechanism portion 21 and the second planetary gear mechanism portion 22 is rotatably supported by the annular support portion 15 of the case 11. The other end portion of the counter drive gear 23 is rotatably supported by an annular thick portion of the housing 13 that faces the annular support portion 15. The counter drive gear 23 meshes with the counter driven gear 33.

  The counter driven gear 33 is spline-coupled to a counter shaft 35 integrally formed with a final drive gear 34. The final drive gear 34 is a differential ring gear 37 (a final gear fastened and sheathed to a differential case 36 of the differential mechanism 30). Gear). Further, in the differential case 36, a pair of differential pinions 38a and 38b and a pair of left and right differential side gears 39a and 39b are provided. Note that the speed reduction by the plurality of gears 23, 33, 34, and 37, the function of the differential mechanism 30, and the like are well-known and will not be described in detail here.

  As shown in FIG. 2, the drive motor 41 is configured as a permanent magnet synchronous motor having a rotor 41a on which a permanent magnet 41m is mounted and a stator 41b on which a three-phase coil 41c is wound, for example. 41a is rotatably supported by the shaft hole portion 11a of the case 11 through a bearing 43, and is spline-coupled to the sun gear of the first planetary gear mechanism portion 21 at an end portion on the inner side of the case. The outer end of the rotor 41 a in the axial direction is rotatably supported by the bearing holding portion 12 a of the cover 12 via a bearing 44.

  The motor generator 42 is configured as a permanent magnet synchronous generator motor having, for example, a rotor 42a on which a permanent magnet 42m is mounted and a stator 42b around which a three-phase coil 42c is wound. The rotor 42a rotates around the input shaft 1. It is supported freely and is rotatably supported by the shaft hole portion 13a of the housing 13 through a bearing 45, and is spline-coupled to the sun gear of the second planetary gear mechanism portion 22 at the end portion on the inner side of the case. . The end of the rotor 42a on the engine side is rotatably supported by the cover 14 in the housing 13 via a bearing 46.

  On the other hand, in the vehicle power transmission device of this embodiment, lubricating oil, that is, a fluid for lubrication or / and cooling, is stored in the transmission case 10, as indicated by an arrow f0 in FIGS. The lubricating oil is pumped upward in the transmission case 10 by the differential ring gear 37 so as to flow along the inner wall surface of the transmission case 10, so that the fluid introduction passage 101 formed in the upper side in the transmission case 10. To be introduced. Then, as indicated by arrows f1 to f6 in FIG. 4 and FIG. 5, the lubricant oil gradually flows down through the fluid introduction passage 101 while branching the lubricating oil into a plurality of predetermined lubrication / cooling paths in the transmission case 10. The lubricating oil that has returned to the bottom side in the transmission case 10 is again raked up by the differential ring gear 37 and circulated in the transmission case 10.

  As shown in FIG. 1 to FIG. 3, the fluid introduction passage 101 has an introduction port 102 for introducing the lubricant pumped up by the differential ring gear 37, and the lubricant introduced from the introduction port 102 on the differential ring gear 37 side, It is located between the downstream passage portion 104 that flows down to the drive motor 41 side and the motor generator 42 side, and the introduction port 102 and the downstream passage portion 104, and has a larger passage cross-sectional area than the introduction port 102 and the downstream passage portion 104. And a widening passage portion 103 widened to be.

  The widening passage forming portion 113 of the transmission case 10 forming the widening passage portion 103 has a concave shape having an inner bottom wall surface 113a below the introduction port 102, and this inner bottom wall surface 113a is formed in the vicinity of the introduction port 102. An upstream inclined surface 113b positioned on the lower side as it enters the fluid introduction passage 101 from the inlet 102, and a downstream inclined surface 113c positioned on the upper side as it is continuous with the upstream inclined surface 113b and away from the inlet 102 side. And has a curved shape.

  Specifically, as shown in FIGS. 3 and 4, the inner bottom wall surface 113 a of the widening passage forming portion 113 is, for example, a quadrangular cylindrical surface having an arc cross section with a radius of curvature r in the entire passage width direction of the widening passage portion 103. It has a curved shape. Of course, the cross-sectional shape of the inner bottom wall surface 113a is not limited to the circular arc cross section.

  Also, the passage cross-sectional areas of the introduction port 102 and the downstream side passage portion 104 of the fluid introduction passage 101 are equal to each other, and as shown in FIG. 3, the passage width h1 in the vertical direction of the introduction port 102 and the downstream side passage. The passage widths h2 in the vertical direction of the portion 104 are equal to each other. The passage cross-sectional area here is a cross-sectional area of a cross section orthogonal to the extending direction of the fluid introduction passage 101, and when the introduction port 102 is inclined with respect to the extending direction as shown in FIG. The passage cross-sectional area of the port 102 is an orthogonal cross-sectional area at a portion of the peripheral portion of the introduction port 102 that is closest to the widened passage portion 103.

  Furthermore, the inner bottom surface 112 a of the introduction port forming portion 112 of the transmission case 10 that forms the introduction port 102 is substantially the same height as the inner bottom surface 114 a of the downstream passage formation portion 114 of the transmission case 10 that forms the downstream passage portion 104. The inner bottom surfaces 112a and 114a are located on substantially the same plane.

  The transmission case 10 also has a catch tank 121 that introduces the lubricating oil pumped up by the differential ring gear 37 through the fluid introduction passage 101 and temporarily stores the oil. Although details are not shown, Is formed with a downward passage portion 121a for gradually flowing the stored lubricating oil downward.

  More specifically, the case 11 of the transmission case 10 has a lateral direction, that is, a plurality of gears 23, 33, 34 that integrally configure the introduction port forming portion 112, the widening passage forming portion 113, and the downstream side passage forming portion 114. , 37 is formed in the housing 13 of the transmission case 10 so as to face the projecting end of the passage forming rib 115 (FIG. 5). The fluid introduction passage 101 is formed by the case 11 and the inner wall surface of the housing 13 which are bolted together with the passage formation ribs 115 and 131.

  As shown in FIGS. 4 and 5, in the vicinity of the passage forming ribs 115 and 131, the lubricating oil flow f <b> 0 lifted up by the differential ring gear 37 flows into the catch tank 121 and flows f <b> 1 and f <b> 3. The flow branches to the flow f5 toward the cooling passage 132 for cooling the generator 42, and passes through the passage forming portion 133 on the side of the housing 13 on the side of the wide passage portion 113 and the cooling passage 119 on the case 11 side. The flow f6 to the cooling passage for cooling the drive motor 41 is also branched.

  The amount of lubricating oil entering the catch tank 121 from the downstream passage portion 104 of the fluid introduction passage 101 varies depending on the rotational speed of the differential ring gear 37 and the amount of lubricating oil stored on the inner bottom side of the transmission case 10. Lubricating oil that has entered the catch tank 121 is temporarily stored in the catch tank 121, and is supplied to the counter drive gear 23 and the like through a flow-down passage portion 121 a disposed in at least one location of the catch tank 121. It has come to be.

  Further, not only the lubricating oil entering the catch tank 121 from the fluid introduction passage 101 but also the lubricating oil is scattered and introduced in the flow direction f2 from the counter drive gear 23 side toward the catch tank 121 side, and a part of the lubricating oil and the catch The air in the tank 121 goes in and out of the fluid introduction passage 101 and the catch tank 121 through other communication holes 117 and 118 formed in the case 11.

  Further, a known oil pump 70 driven by a drive motor 41 is accommodated in the case 11 of the transmission case 10, and the drive motor 41, the motor generator 42 and the planetary gear mechanism 20 are centered by the oil pump 70. The lubricating oil is supplied to each sliding part and rolling part in the transmission case 10 through the oil passage 71, and the lubricating oil after lubrication flows down to the bottom side in the transmission case 10. It has become.

  Next, the operation will be described.

  In the fluid passage structure of the power transmission device of the present embodiment configured as described above, when the vehicle travels, the planetary gear mechanism 20 decelerates the output rotation of the drive motor 41 and power from the engine side. Is distributed to the motor generator 42 and the counter drive gear 23, the differential ring gear 37 is driven from the counter drive gear 23 via the counter driven gear 33 and the final drive gear 34, and the rotational output from the differential mechanism 30 to the drive shafts 31, 32. Is made.

  In this state, the lubricating oil stored in the transmission case 10 due to the rotation of the differential ring gear 37 in the transmission case 10 is directed upward along the inner wall surface of the transmission case 10 as indicated by an arrow f0 in FIGS. Then, it is discharged obliquely upward from the bent position 11p of the inner wall surface of the transmission case 10 and introduced into the fluid introduction passage 101 located on the upper side in the transmission case 10. Then, as shown by arrows f1 to f6 in FIG. 4 and FIG. 5, the fluid is introduced into a plurality of lubrication / cooling paths in the transmission case 10 through the fluid introduction passage 101, and a part is temporarily transferred to the catch tank 121. The lubricating oil gradually flows down after being stored. Further, the lubricating oil that has returned to the bottom side in the transmission case 10 is again scooped up by the differential ring gear 37, and the lubricating oil circulates in the transmission case 10.

  The lubricating oil also circulates through the lubricating oil supply path by the oil pump 70. However, by using the lift of the differential ring gear 37 and the catch tank 121 in combination, the amount of lubricating oil stored in the inner bottom portion of the transmission case 10 can be reduced. It is possible to suppress the power consumed for driving the oil pump 70 while suppressing the power.

  When the lubricating oil is introduced into the fluid introduction passage 101 by lifting the differential ring gear 37 as described above, the fluid introduction passage 101 is widened so that the passage cross-sectional area is larger than the introduction port 102 and the downstream passage portion 104. Since the lubricating oil pumped up into the fluid introduction passage 101 by the differential ring gear 37 causes a vortex in the lubricating oil in the widening passage portion 103 due to the flow, the downstream of the fluid introduction passage 101. It will flow to the side part. Therefore, even if the operating state of the vehicle is likely to cause a backflow of the lubricating oil from the introduction port 102 to the outside of the fluid introduction passage 101, the backflow is suppressed by the lubricating oil pumped up in the fluid introduction passage 101, It becomes difficult to occur.

  In particular, in the present embodiment, the widening passage forming portion 113 of the transmission case 10 that forms the widening passage portion 103 has a concave shape having an inner bottom wall surface 113a below the introduction port 102. Due to the flow of the lubricating oil pumped up in the fluid introduction passage 101, the lubricating oil flows downstream above the lubricating oil accumulated in the recessed widened passage forming portion 113, and a vertical vortex is generated in the widened passage portion 103. As a result, the backflow of the lubricating oil is less likely to occur.

  Further, since the passage cross-sectional areas of the introduction port 102 and the downstream passage portion 104 are equal, the introduction port 102 of the lubricating oil does not become narrower than the downstream portion of the fluid introduction passage 101, Even when the size of the transmission case 10 is limited, it is possible to easily secure a sufficient amount of lubricating oil that is suitable for the operating state of the power transmission device.

  Further, an upstream inclined surface 113b that is positioned on the lower side as the inner bottom wall surface 113a of the concave-shaped widening passage forming portion 113 enters the fluid introduction passage 101 from the introduction port 102 in the vicinity of the introduction port 102, and its upstream side. Since it has a curved shape having a downstream inclined surface 113c that is continuous with the inclined surface 113b and further away from the introduction port 102 side, the differential ring gear 37 pumps the lubricating oil pumped up into the fluid introduction passage 101. The flow causes a vertical vortex fv (see FIG. 4) in which the lubricating oil flows toward the downstream side above the lubricating oil accumulated in the recessed widening passage forming portion 113, and a flow in the reverse flow direction is generated in the fluid introduction passage 101. Even if it occurs, the flow will be folded back in the direction of introduction of the lubricating oil in the recessed widened passage forming portion 113, and the backflow of the lubricating oil will occur more. Kunar.

  In addition, in this embodiment, the transmission case 10 has the catch tank 121 that introduces the lubricating oil pumped up by the differential ring gear 37 through the fluid introduction passage 101 and temporarily stores it. Lubricating oil pumped up from the inner bottom side of the transmission case 10 is introduced into the catch tank 121 from the fluid introduction passage 101 and temporarily stored in the tank, and the lubricating oil is gradually set in advance in the gear transmission and the like. In addition to effectively reducing the rotational load of a large gear such as the differential ring gear 37 that will flow through the lubrication / cooling path and stir and agitate the stored lubricating oil, Lubrication and cooling of the heat generating part will be ensured.

  Further, the lifting of the lubricating oil from the inner bottom side of the transmission case 10 is stably executed by the rotating differential ring gear 37, and the amount of the lifting increases and decreases according to the rotational speed of the gear. Lubrication / cooling is possible. Further, the power transmission device of the present embodiment includes a planetary gear mechanism 20 and a differential mechanism 30 that are vehicle transmission mechanisms, and the differential ring gear 37 is a ring gear that is externally mounted on the differential mechanism 30. The differential ring gear 37 having a high speed effectively lifts the lubricating oil, so that it is possible to ensure a sufficient amount of the lubricating oil introduced suitable for the operating state of the power transmission device.

  As described above, in the fluid passage structure of the power transmission device according to the present embodiment, the fluid introduction passage 101 is provided with the widening passage portion 103 widened so that the passage cross-sectional area is larger than the introduction port 102 and the downstream passage portion 104. The lubricant flows in the downstream portion of the fluid introduction passage 101 while generating a vortex in the lubricant accumulated in the wide passage portion 103 by the flow of the lubricant pumped into the fluid introduction passage 101 by the differential ring gear 37. Therefore, the backflow of the lubricating oil from the introduction port 102 to the outside of the fluid introduction passage 101 can be made difficult to occur, and even when the size of the transmission case 10 is restricted, the backflow prevention function can be exhibited. Moreover, a power transmission that can secure a sufficient amount of lubricating oil suitable for the operating state of the power transmission device. It is possible to provide a fluidic channel structure of the device.

  Note that the transmission element for pumping up the fluid according to the present invention is not limited to the differential ring gear as shown in the above-described embodiment, and at least a part of the transmission element is close to the inner bottom of the case. Anything suitable for soaking and scooping may be used, and the present invention is not limited to gears. In the above-described embodiment, the inner bottom wall surface of the widened passage forming portion having a concave shape is recessed downward from the introduction port. However, the widening direction of the widened passage portion itself is limited only to the lower side. However, as long as the reverse flow is turned back by the flow of the fluid to be introduced, it can be widened in other directions, for example, both sides or one side of the fluid introduction passage, and the widening direction can be a plurality of directions. It may be. In addition, the catch tank is designed to gradually supply the lubricating oil to the gear transmission, etc., but supplies lubricating or / and cooling fluid to any sliding part, rolling part and heat generating part. It may be. The fluid may be not only a liquid for lubrication or cooling but also a fluid containing a liquid or a solid component.

  As described above, in the fluid passage structure of the power transmission device according to the present invention, the fluid introduction passage is provided with the widening passage portion widened so that the passage cross-sectional area is larger than the introduction port and the downstream passage portion, and the transmission element As a result, the fluid flows up to the downstream portion of the fluid introduction passage while the vortex is generated in the fluid accumulated in the wide passage portion by the flow of the fluid pumped up in the fluid introduction passage. Introducing a sufficient amount of fluid suitable for the operating state of the power transmission device, which can prevent backflow of fluid out of the passage and can exhibit a backflow prevention function even when the case size is limited. It is possible to provide a fluid passage structure of a power transmission device capable of securing the amount, and the fluid passage structure of the power transmission device, particularly in the case Fluid useful in the fluid passage structure in general of the power transmission apparatus that circulates splashed upward by transmission element such as a gear, such as Namerayu.

1 is a side view of a case showing a state in which a planetary gear mechanism in which a counter drive gear is integrated and a counter driven gear are fitted into a case on one side of a vehicle power transmission device according to an embodiment of the present invention. It is the combined sectional view seen in the II-II arrow direction of FIG. It is the elements on larger scale which expand and show the principal part of the power transmission device for vehicles shown in FIG. It is explanatory drawing of the flow of the lubricating oil on the principal part side surface cross section of the vehicle power transmission device which concerns on one Embodiment. It is explanatory drawing of the flow of the lubricating oil on the principal part plane cross section of the power transmission device for vehicles which concerns on one Embodiment.

Explanation of symbols

10 Transmission case (case)
11 Case 13 Housing 14 Cover 20 Planetary gear mechanism (transmission mechanism)
23 counter drive gear 30 differential mechanism 31, 32 drive shaft 33 counter driven gear 37 differential ring gear (gear, ring gear mounted on the differential mechanism)
40 motor type drive means 41 drive motor 42 motor generator 70 oil pump 101 fluid introduction passage 102 introduction port 103 widening passage portion 104 downstream passage portion 112 introduction port formation portions 112a, 114a inner bottom surface 113 widening passage formation portion 113a inner bottom wall surface 113b Upstream inclined surface 113c Downstream inclined surface 114 Downstream passage forming portion 115, 131 Passage forming rib 117, 118 Communication hole 119 Cooling passage 121 Catch tank 121a Downflow passage portion 132 Cooling passage 133 Passage forming portion f0, f1 , F2, f3, f4, f5, f6 Flow direction h1, h2 Passage width

Claims (5)

Lubricating or cooling fluid stored in the case is pumped up to a fluid introduction passage formed in the case by a transmission element built in the case, and the fluid is circulated in the case through the fluid introduction passage. In the fluid passage structure of the power transmission device,
The fluid introduction passage includes an introduction port that introduces the fluid pumped up by the transmission element, a downstream passage portion that causes the fluid introduced from the introduction port to flow down to the transmission element side, the introduction port, and the A widened passage portion that is located between the downstream passage portions and is widened so that a passage sectional area is larger than that of the introduction port and the downstream passage portion ;
The widening passage forming portion of the case forming the widening passage portion has a concave shape having an inner bottom wall surface below the introduction port, and
An upstream inclined surface located on the lower side as the inner bottom wall surface enters the fluid introduction passage from the introduction port in the vicinity of the introduction port, and an upper side that is continuous with the upstream inclination surface and away from the introduction port side. A fluid passage structure of a power transmission device having a curved shape having a downstream inclined surface located on the side . The fluid passage structure of a power transmission device according to claim 1, wherein passage cross-sectional areas of the introduction port and the downstream passage portion are equal . 3. The power according to claim 1, wherein the case has a catch tank that introduces the fluid pumped up by the transmission element through the fluid introduction passage and temporarily stores the catch tank. Fluid passage structure of the transmission device. The fluid passage structure of a power transmission device according to any one of claims 1 to 3, wherein the transmission element is a gear . The power transmission device includes a transmission mechanism for a vehicle and a differential mechanism,
The fluid passage structure of the power transmission device according to claim 4, wherein the transmission element is a ring gear externally mounted on the differential mechanism .

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