JP2015190506A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further reduce stirring resistance of a hydraulic oil acting on a differential ring gear by further properly suppressing inflow of the hydraulic oil to a differential chamber where the differential ring gear and a differential gear are disposed.SOLUTION: A first seal portion 77 of an outer edge portion including a bottom portion of a flange portion 72 of a reservoir plate 70 is brought into contact with a housing-side step surface 223 of a converter housing 220 to secure sealing of the first seal portion 77. A second seal portion 78 at an opposite side of the first seal portion 77 from the bottom portion of the flange portion 72 is formed so that an outer edge has the linear shape, and is brought into contact with a linear rib formed on a transaxle case and pressed to secure sealing of the second seal portion 78. By forming an outer edge of the second seal portion 78 into the linear shape, the outer edge can keep a contact state even when it is pressed by the rib and deformed, in comparison with a case where the outer edge has the circular arc-shape or curved shape, and the sealing can be further properly retained.

Description

  The present invention relates to a power transmission device, and more specifically, includes a diff ring gear disposed below an input side drive pinion gear and meshing with the drive pinion gear, a differential gear coupled to the diff ring gear, a diff ring gear, and a differential gear. The present invention relates to a power transmission device including a housing case.

  Conventionally, this type of power transmission device has a counter shaft arranged in parallel with the input shaft of the speed change mechanism, and a ring gear (diff ring gear) arranged below the counter shaft and meshing with the output gear of the counter shaft. A differential device (differential gear), a case member that houses the speed change mechanism and the differential device, a differential chamber in which the differential device is disposed, and oil (hydraulic fluid) are stored in the case member. What is provided with the differential division member divided into 2 is known (for example, refer patent document 1). The differential partitioning member of the power transmission device includes a part of the case member, a rib member extending from the case member along the outer peripheral surface of the ring gear, and a rib that covers the differential device from the opposite side of the case member. And a hemispherical reservoir plate disposed so as to be in close contact with the inner peripheral surface of the member. Thereby, in this power transmission device, inflow of oil from the storage chamber into the differential chamber is suppressed by the differential partition member.

International Publication No. 2011/121861

  However, in the above-described conventional power transmission device, it is difficult to completely bring the reservoir plate into close contact with the inner peripheral surface of the rib member, and a gap is also formed between the reservoir plate and the inner surface of the case. For this reason, the oil in the storage chamber cannot be sufficiently prevented from flowing into the differential chamber from the clearance between the reservoir plate and the rib member or the clearance between the reservoir plate and the inner surface of the case, and acts on the ring gear of the differential device. There is a possibility that oil stirring resistance cannot be reduced.

  The power transmission device according to the present invention has a main purpose of better suppressing the flow of hydraulic oil into the differential chamber in which the differential ring gear and the differential gear are arranged, and further reducing the stirring resistance of the hydraulic oil acting on the differential ring gear. And

  The power transmission device of the present invention employs the following means in order to achieve the main object described above.

The power transmission device of the present invention is
A differential ring gear disposed below the drive pinion gear on the input side and meshing with the drive pinion gear, a differential gear coupled to the differential ring gear, a case housing the differential ring gear and the differential gear, and inside the case In a power transmission device comprising: a differential member in which a differential chamber in which the differential ring gear and the differential gear are arranged and a hydraulic oil storage chamber that stores hydraulic oil is partitioned;
The case is a member in which the hydraulic oil storage chamber is formed by the partition member, a first case mating surface is formed on an outer edge, and the first case mating surface is near the bottom of the first case mating surface. A first case member formed with a first step surface stepped inward from the first member, and a second case mating surface which is a member in which the differential chamber is formed by the partition member and is aligned with the first case mating surface And a second case member formed with ribs extending along the outer edge of the partition member from near the bottom of the second case mating surface,
The partition member includes a bottom portion of the outer peripheral portion, and a first seal portion that contacts and seals against the first step surface is formed in a first range from the bottom portion toward one direction. In the second range from the vicinity of the end on the bottom side of the first range to the other direction, an outer edge is formed in a straight line, and a second seal portion is formed that contacts and seals the rib.
It is characterized by that.

  In this power transmission device of the present invention, the case includes a first case member in which the hydraulic oil storage chamber is formed by the partition member, and a second case member in which the differential chamber is formed by the partition member. In the first case member, a first case mating surface is formed on the outer edge, and a first step surface that is stepped from the first case mating surface to the case side is formed near the bottom of the first case mating surface. . The second case member is formed with a second case mating surface that is aligned with the first case mating surface, and is formed with a rib extending from the vicinity of the bottom of the second case mating surface along the outer edge of the partition member. And the 1st seal | sticker part is formed in the 1st range which went to one direction from this bottom part including the bottom part among the outer peripheral parts of the division member which divides a differential chamber and a hydraulic oil storage chamber, This 1st The seal portion abuts on the first step surface to ensure the seal of the first seal portion. A second seal portion having a linear outer edge is formed in the second range of the outer periphery of the partition member in the second direction from the vicinity of the end on the bottom side of the first range to the other direction. 2 Abuts against the rib of the case member to secure the seal of the second seal portion. Since the outer edge of the second seal portion is formed in a straight line shape, even if a slight deformation occurs due to contact with the rib, the outer edge is in contact with the rib as compared to a circular or curved shape. Can be maintained. As a result, the seal of the second seal portion can be held better. As a result, the inflow of hydraulic oil to the differential chamber in which the differential ring gear and the differential gear are arranged can be more effectively suppressed, and the stirring resistance of the hydraulic oil acting on the differential ring gear can be further reduced. The second seal portion may be formed so as to extend in the radial direction. In this case, it is possible to sufficiently receive the pressure from the ribs as compared with the case that does not extend in the radial direction, and it is possible to hold the seal of the second seal portion better.

It is a schematic block diagram of the power transmission device 20 by this invention. FIG. 2 is an operation table showing the relationship between each shift stage of an automatic transmission 25 included in the power transmission device 20 of FIG. 1 and the operating states of clutches and brakes. 6 is an explanatory view showing a state in which a reservoir plate is attached to a converter housing. FIG. 4 is an explanatory view showing the inside of a transaxle case 240. FIG. FIG. 6 is an explanatory view showing a state where a reservoir plate 70 is disposed inside a transaxle case 240. It is explanatory drawing which shows the cross section along the AB line in FIG. It is explanatory drawing which shows the cross section along the AC line in FIG. It is explanatory drawing which shows the cross section along the AD line in FIG. 3 is an external view showing an external appearance of a reservoir plate 70. FIG. 3 is an external view showing an external appearance of a reservoir plate 70. FIG. 3 is an external view showing an external appearance of a reservoir plate 70. FIG. It is explanatory drawing which expands and shows the part containing the 2nd seal | sticker part 78 in FIG. It is explanatory drawing which expands and shows the part of the bolt hole 248a vicinity in FIG.

  Next, the form for implementing this invention is demonstrated, referring drawings.

  FIG. 1 is a schematic configuration diagram of a power transmission device 20 according to the present invention. A power transmission device 20 shown in the figure is connected to a crankshaft of an engine (not shown) mounted on a front wheel drive type vehicle and can transmit power from the engine to left and right drive wheels (front wheels) DW. . As shown in the figure, the power transmission device 20 includes a converter case 220 (first case member) and a transmission case 22 including a transaxle case 240 (second case member) coupled to the converter housing 220. Includes a fluid transmission device (starting device) 23 housed in the vehicle, an oil pump 24, an automatic transmission 25 housed in the transaxle case 240, a gear mechanism (gear train) 40, a differential gear (differential mechanism) 50, and the like. .

  The fluid transmission device 23 includes an input-side pump impeller 23p connected to an engine crankshaft, and an output-side turbine runner 23t, a pump impeller 23p, and a turbine runner 23t connected to an input shaft 26 of an automatic transmission 25. And a torque converter having a stator 23s that rectifies the flow of hydraulic oil from the turbine runner 23t to the pump impeller 23p, a one-way clutch 23o that restricts the rotational direction of the stator 23s in one direction, a lock-up clutch 23c, and the like. The However, the fluid transmission device 23 may be configured as a fluid coupling that does not have the stator 23s.

  The oil pump 24 is configured as a gear pump including a pump assembly including a pump body and a pump cover, and an external gear connected to the pump impeller 23p of the fluid transmission device 23 via a hub. The oil pump 24 is driven by power from the engine, sucks hydraulic oil (ATF) stored in an oil pan (not shown), and pumps it to a hydraulic control device (not shown).

  The automatic transmission 25 is configured as an eight-speed transmission, and as shown in FIG. 1, a double pinion type first planetary gear mechanism 30, a Ravigneaux type second planetary gear mechanism 35, and an input 4 clutches C1, C2, C3 and C4, two brakes B1 and B2, and a one-way clutch F1 for changing the power transmission path from the side to the output side.

  The first planetary gear mechanism 30 includes a sun gear 31 that is an external gear, a ring gear 32 that is an internal gear disposed concentrically with the sun gear 31, and meshes with each other, one being the sun gear 31 and the other being the ring gear 32. And a planetary carrier 34 that holds a plurality of pairs of pinion gears 33a and 33b that mesh with each other so as to rotate and revolve. As shown in the drawing, the sun gear 31 of the first planetary gear mechanism 30 is fixed to the transmission case 22, and the planetary carrier 34 of the first planetary gear mechanism 30 is connected to the input shaft 26 so as to be integrally rotatable. The first planetary gear mechanism 30 is configured as a so-called reduction gear, and decelerates the power transmitted to the planetary carrier 34 as an input element and outputs it from the ring gear 32 as an output element.

  The second planetary gear mechanism 35 includes a first sun gear 36a and a second sun gear 36b which are external gears, a ring gear 37 which is an internal gear disposed concentrically with the first and second sun gears 36a and 36b, A plurality of short pinion gears 38a meshing with one sun gear 36a, a plurality of long pinion gears 38b meshing with the second sun gear 36b and the plurality of short pinion gears 38a and meshing with the ring gear 37, a plurality of short pinion gears 38a and a plurality of long pinion gears 38b And a planetary carrier 39 that holds the motor in a rotatable (rotatable) and revolving manner. The ring gear 37 of the second planetary gear mechanism 35 functions as an output member of the automatic transmission 25, and the power transmitted from the input shaft 26 to the ring gear 37 is transmitted to the left and right via the gear mechanism 40, the differential gear 50 and the drive shaft 28. Is transmitted to the driving wheel. The planetary carrier 39 is supported by the transmission case 22 via the one-way clutch F1, and the rotation direction of the planetary carrier 39 is limited to one direction by the one-way clutch F1.

  The clutch C1 has a hydraulic servo composed of a piston, a plurality of friction plates and mating plates, an oil chamber to which hydraulic oil is supplied, and the like, and the ring gear 32 of the first planetary gear mechanism 30 and the second planetary gear mechanism 35 This is a multi-plate friction type hydraulic clutch (friction engagement element) capable of fastening the first sun gear 36a and releasing the fastening of both. The clutch C2 has a hydraulic servo composed of a piston, a plurality of friction plates and mating plates, an oil chamber supplied with hydraulic oil, and the like, and fastens the input shaft 26 and the planetary carrier 39 of the second planetary gear mechanism 35. In addition, this is a multi-plate friction type hydraulic clutch capable of releasing the fastening of both. The clutch C3 has a hydraulic servo composed of a piston, a plurality of friction plates and mating plates, an oil chamber to which hydraulic oil is supplied, and the like. The ring gear 32 of the first planetary gear mechanism 30 and the second planetary gear mechanism 35 This is a multi-plate friction hydraulic clutch capable of fastening the second sun gear 36b and releasing the fastening of both. The clutch C4 has a hydraulic servo composed of a piston, a plurality of friction plates, a counter plate, an oil chamber to which hydraulic oil is supplied, and the like, and the planetary carrier 34 and the second planetary gear mechanism 35 of the first planetary gear mechanism 30. This is a multi-plate friction type hydraulic clutch capable of fastening the second sun gear 36b and releasing the fastening of both.

  The brake B1 is configured as a band brake including a hydraulic servo or a multi-plate friction brake, and fixes the second sun gear 36b of the second planetary gear mechanism 35 to the transmission case 22 in a non-rotatable manner and the transmission of the second sun gear 36b. This is a hydraulic brake (friction engagement element) that can be released from being fixed to the case 22. The brake B2 is configured as a band brake including a hydraulic servo or a multi-plate friction brake, and fixes the planetary carrier 39 of the second planetary gear mechanism 35 to the transmission case 22 in a non-rotatable manner and the transmission case 22 of the planetary carrier 39. This is a hydraulic brake that can be released from the fixed state. The one-way clutch F1 includes, for example, an inner race, an outer race, and a plurality of sprags. When the outer race rotates in one direction with respect to the inner race, the one-way clutch F1 transmits torque via the sprag and Thus, when the outer race rotates in the other direction, both are rotated relative to each other. However, the one-way clutch F1 may have a configuration other than a sprag type such as a roller type.

  The clutches C1 to C4 and the brakes B1 and B2 operate by receiving and supplying hydraulic oil from a hydraulic control device (not shown). FIG. 2 shows an operation table showing the relationship between the respective speeds of the automatic transmission 25 and the operating states of the clutches C1 to C4, the brakes B1 and B2, and the one-way clutch F1. The automatic transmission 25 provides the forward 1st to 8th gears and the reverse 1st and 2nd gears by setting the clutches C1 to C4 and the brakes B1 and B2 to the states shown in the operation table of FIG. . At least one of the clutches C1 to C4 and the brakes B1 and B2 may be a meshing engagement element such as a dog clutch.

  The gear mechanism 40 is fixed to a counter drive gear 41 connected to the ring gear 37 of the second planetary gear mechanism 35 of the automatic transmission 25 and a counter shaft 42 extending in parallel with the input shaft 26 of the automatic transmission 25. A counter driven gear 43 that meshes with the counter drive gear 41, a drive pinion gear (final drive gear) 44 formed (or fixed) on the counter shaft 42, and disposed below the drive pinion gear 44 (see FIG. 3). And a differential ring gear (final driven gear) 45 that meshes with the drive pinion gear 44. The diff ring gear 45 is configured as a helical gear.

  As shown in FIGS. 1 and 3 to 8, the differential gear 50 includes a pair (two) of pinion gears 51 and a pair (two) of pinions that are fixed to the drive shaft 28 and mesh with the pair of pinion gears 51 at right angles. ) Side gear 52, a pinion shaft 53 that supports the pair of pinion gears 51, and a differential case 54 that houses the pair of pinion gears 51 and the pair of side gears 52 and that is connected (fixed) to the above-described diffring gear 45. In the present embodiment, each pinion gear 51 and each side gear 52 are configured as bevel gears. A pinion washer 55 is disposed between each pinion gear 51 and the differential case 54, and a side washer 56 is disposed between each side gear 52 and the differential case 54. The differential case 54 is rotatably supported by the transmission case 22 coaxially with the drive shaft 28 via bearings 81 and 82.

  Next, the structure around the differential ring gear 45 and the differential gear 50 in the power transmission device 20 will be described. 3 is an explanatory view showing a state in which the reservoir plate 70 is attached to the converter housing 220, FIG. 4 is an explanatory view showing the inside of the transaxle case 240, and FIG. 5 is a view showing the reservoir plate 70 inside the transaxle case 240. It is explanatory drawing which shows the state which has arrange | positioned. 6 is an explanatory view showing a cross section taken along line AB in FIG. 3, FIG. 7 is an explanatory view showing a cross section taken along line AC in FIG. 3, and FIG. 8 is shown in FIG. It is explanatory drawing which shows the cross section along the AD line. A broken circle at the upper left in FIG. 3 indicates the drive pinion gear 44, and a broken circle at the center indicates the diffring gear 45. Also, the alternate long and short dash line in FIG. 3 indicates the liquid level of the hydraulic oil in the hydraulic oil storage chamber 65, and the arrow indicates the rotational direction of the diff ring gear 45.

  As shown in these drawings, a diff ring gear 45 and a differential gear 50 are arranged in a transmission case 22 including a converter housing 220 and a transaxle case 240 by a reservoir plate 70 shown in FIGS. Differential chamber 60 and hydraulic oil storage chamber 65 for storing hydraulic oil. In the following description, “upper” and “lower” respectively indicate “upper” or “lower” in the vertical direction when the power transmission device 20 is mounted on the vehicle.

  As shown in FIG. 3, converter housing 220 has a housing side mating surface (first case is mating surface) 221 when assembled to transaxle case 240. The housing side mating surface 221 is formed with a plurality of bolt holes including bolt holes 228a and 228b at the bottom. In the range from the vicinity of the bolt hole 228a of the housing side mating surface 221 to about 90 degrees along the outer edge of the reservoir plate 70 in the right direction in the drawing, the inner side is approximately the thickness of the reservoir plate 70 along the housing side mating surface 221. A housing-side step surface (first step surface) 223 that is stepped is formed.

  As shown in FIG. 4, transaxle case 240 has a case side mating surface (second case mating surface) 241 when assembled to converter housing 220. A plurality of bolt holes including bottom bolt holes 248a and 248b are formed in the case side mating surface 241. The transaxle case 240 is formed with a rib 242 extending linearly from the vicinity of the bolt hole 248a of the case side mating surface 241 to the center side at an angle of approximately 45 degrees in the right direction in the drawing. Between the rib 242 and the case side mating surface 241 in the vicinity of the bolt hole 248a, a slight sealing gap 244 is provided to ensure a seal of the liquid seal member 250 when the converter housing 220 and the transaxle case 240 are assembled. Is formed. Further, a case-side step surface (second step surface) 243 that is stepped inward by the thickness of the reservoir plate 70 is formed from the vicinity of the center of the rib 242 to the case-side mating surface 241 side. When the converter housing 220 and the transaxle case 240 are assembled, the case-side step surface 243 is over the part of the housing-side step surface 223 formed in the converter housing 220 (range from the bolt hole 248a to the bolt hole 248b). Wrap.

  As shown in FIGS. 9 to 11, the reservoir plate 70 includes a tubular portion 71 and a flange portion 72 extending radially outward from the tubular portion 71. The reservoir plate 70 uses a bolt hole 76a formed in the cylindrical portion 71 and two bolt holes 76b and 76c formed in the flange portion 72, as shown in FIG. It is attached and fixed to the housing 220. The reservoir plate 70 composed of the cylindrical portion 71 and the flange portion 72 is formed by pressing a metal member such as iron. The reservoir plate 70 may be formed by injection molding with resin.

  As shown in FIGS. 6 to 8, the cylindrical portion 71 is formed so as to extend along a part of the outer peripheral surface of the differential case 54 of the differential gear 50, and mainly one side gear support portion of the differential case 54. The portion excluding (the portion supported by the converter housing 220 via the bearing 81) is surrounded. A slight clearance is defined between the end of the cylindrical portion 71 on the converter housing 220 side and the converter housing 220 with the reservoir plate 70 fixed to the transmission case 22.

  The flange portion 72 extends radially outward from an end portion of the tubular portion 71 on the transaxle case 240 side. In addition, a notch 70s is formed on the upper portion of the flange portion 72 and the cylindrical portion 71 so as not to interfere with a bearing (not shown) that rotatably supports the countershaft 42. A circular arc (substantially C-shaped) extends around the shape portion 71. As shown in FIG. 3, a first seal portion 77 is formed on the outer edge portion of the flange portion 72 from the bottom portion to the right side in the drawing up to approximately 90 degrees upward. The first seal portion 77 ensures the seal of the first seal portion 77 by contacting the housing side step surface 223 of the converter housing 220. Further, a second seal portion 78 is formed on the outer edge portion of the flange portion 72 from the first seal portion 77 to approximately 60 degrees in the left direction in the drawing. The second seal portion 78 abuts on the rib 242 formed on the transaxle case 240 and ensures the seal of the second seal portion 78 by being pressed from the rib 242.

  As shown in FIGS. 6 and 9 to 11, the second seal portion 78 includes a flat rectangular contact portion 781 whose outer edge is linear and slightly narrower than the width of the rib 242 of the transaxle case 240. In order to project the contact portion 781 to the rib 242 side, the cross section has an S-shape or a crank shape, and a deformation portion 782 that is elastically deformed by a pressing force from the rib 242 is provided. FIG. 12 shows an example in which the second seal portion 78 is elastically deformed by being pressed by the ribs 242. FIG. 12 is an enlarged view of a portion including the second seal portion 78 in FIG. When the converter housing 220 and the transaxle case 240 are assembled, as shown on the left side of FIG. 12, when the contact portion 781 of the second seal portion 78 only contacts the end surface 242a of the rib 242, the deformation portion 782 is deformed. Has not occurred. Thereafter, when the assembly is completed, the contact portion 781 protrudes toward the rib 242 side by the deformable portion 782, so the second seal portion 78 is pressed by the rib 242 and the deformable portion 782 is elastically deformed. Since the contact portion 781 is formed in a straight line shape, the contact portion 781 is in contact with the end surface 242a of the rib 242 by the elastic deformation of the deformation portion 782, as compared with the case where the contact portion 781 is formed in an arc shape. maintain. As a result, the seal of the contact portion 781 can be held better.

  Reservoir plate 70 is attached to converter housing 220 by bolts 86c at bolt holes 76c in the vicinity of second seal portion 78, as shown in FIGS. Thus, by providing the bolt hole 76c in the vicinity of the second seal portion 78, the influence (for example, deformation) due to the elastic deformation of the second seal portion 78 is prevented from reaching the portion above the bolt hole 76c. Can do. Further, since the reservoir plate 70 is attached and fixed in the vicinity of the second seal portion 78, the second seal portion 78 can be prevented from being displaced from the rib 242. In this embodiment, converter housing 220 and transaxle case 240 are assembled using bolt holes 228a and bolt holes 248a on the extension line of rib 242 (second seal portion 78). For this reason, since the bolt hole 228a, 248a side of the 2nd seal part 78 is also hold | maintained, it suppresses that the influence (for example, deformation | transformation) by the elastic deformation of the 2nd seal part 78 reaches the 1st seal part 77 side. Can do.

  In addition, since the abutment portion 781 of the second seal portion 78 is formed in a linear shape, the rib 242 of the transaxle case 240 can also be formed in a linear shape, and the rib 242 is formed in an arc shape or a curved shape. As compared with this, the thickness of the rib 242 can be reduced. As a result, the apparatus can be reduced in weight.

  As shown in FIGS. 3 and 10, the bottom of the first seal portion 77 is a convex extending in the radial direction so as to be aligned with the recess 229 between the bolt hole 228 a and the bolt hole 228 b of the converter housing 220. A positioning portion 771 having a shape is formed. By providing the positioning portion 771, positioning of the reservoir plate 70 when assembled to the converter housing 220 is facilitated. In particular, since the positioning portion 771 is formed in the vicinity of the second seal portion 78, the displacement between the second seal portion 78 and the rib 242 can be suppressed.

  In this embodiment, when the converter housing 220 and the transaxle case 240 are assembled, the liquid seal member 250 is applied to the housing side mating surface 221 or the case side mating surface 241 and sealed. As shown in FIGS. 6, 7, and 8, a part of the liquid seal member 250 is pushed into the case, and the pushed portion is located inside the housing side mating surface 221 or the case side mating surface 241. A seal is secured by contacting a chamfered portion (not shown). Such a seal is also performed in the vicinity between the first seal portion 77 and the second seal portion 78. FIG. 13 is an explanatory view showing, in an enlarged manner, a broken-line circle portion in the vicinity of the bolt hole 248a in FIG. In the figure, the hatched portion in the vicinity of the second seal portion 78 indicates the end surface 242a of the rib 242 with which the contact portion 781 of the second seal portion 78 contacts, and the hatched portion in the vicinity of the positioning portion 771 indicates the first seal portion. The housing side step surface 223 with which the positioning part 771 of 77 contacts is shown. The first seal portion 77 contacts the housing-side step surface 223 of the converter housing 220 to ensure a seal, and the second seal portion 78 contacts the end surface 242a of the rib 242 of the transaxle case 240 to ensure the seal. Accordingly, a switching gap 79 for switching the seal is generated between the first seal portion 77 and the second seal portion 78, and the hydraulic oil is transferred from the hydraulic oil storage chamber 65 to the differential chamber 60 through the switching gap 79. Flow into. In the present embodiment, the case-side step surface 243 is formed in order to reduce or close the opening of the switching gap 79 by the liquid seal member 250. In other words, the liquid seal member 250 applied to the housing side mating surface 221 and the case side mating surface 241 is pushed out by assembly and guided by the case side step surface 243 and the housing side step surface 223, thereby switching gaps. The 79 openings are reduced or closed. Thereby, it is possible to reduce the amount of hydraulic oil flowing into the differential chamber 60 from the hydraulic oil storage chamber 65 via the switching gap 79 and to suppress an increase in the stirring resistance of the hydraulic oil acting on the differential ring gear 45. it can.

  In the power transmission device 20 of the embodiment described above, the first seal portion 77 is formed on the outer edge portion including the bottom portion of the flange portion 72 of the reservoir plate 70, and the first seal portion 77 is the housing side step surface 223 of the converter housing 220. The second seal portion 78 is formed on the opposite side of the first seal portion 77 from the bottom of the flange portion 72, and the second seal portion 78 is connected to the transaxle case 240. The second seal portion 78 is secured by being pressed against the rib 242. Since the second seal portion 78 is in contact with the end surface 242a of the rib 242 by the linear contact portion 781, even if the second seal portion 78 is deformed by being pressed by the end surface 242a of the rib 242, the outer edge is compared with that having an arc shape or a curved shape. Thus, the contact state with the end surface 242a of the rib 242 can be maintained, and the seal can be held better. In addition, the deforming portion 782 that projects the abutting portion 781 toward the rib 242 is elastically deformed, so that the abutting between the abutting portion 781 and the end surface 242a of the rib 242 can be made more reliable. As a result, the inflow of the hydraulic oil from the hydraulic oil storage chamber 65 to the differential chamber 60 can be suppressed more favorably, and the stirring resistance of the hydraulic oil acting on the differential ring gear 45 can be further reduced.

  In the power transmission device 20 of the present embodiment, a bolt hole 76c is provided in the vicinity of the reservoir plate 70 and the second seal portion 78, and the bolt hole 76c is used to attach to the converter housing 220 with the bolt 86c. It is possible to prevent the influence (for example, deformation) due to the elastic deformation of the second seal portion 78 from reaching the portion above the bolt hole 76 c and to prevent the second seal portion 78 from being displaced from the rib 242. As a result, the seal of the second seal portion 78 can be ensured more reliably. In the power transmission device 20 of the present embodiment, the converter housing 220 and the transaxle case 240 are assembled using the bolt hole 228a and the bolt hole 248a on the extension line of the rib 242 (second seal portion 78). The holding of the seal portion 78 on the bolt holes 228a and 248a side can also be made favorable, and the influence (for example, deformation) due to the elastic deformation of the second seal portion 78 is prevented from reaching the first seal portion 77 side. be able to. As a result, the inflow of the hydraulic oil from the hydraulic oil storage chamber 65 to the differential chamber 60 can be suppressed better.

  In the power transmission device 20 of the present embodiment, a convex positioning portion 771 extending in the radial direction is provided in the vicinity of the second seal portion 78 of the first seal portion 77, and the bolt hole 228a and the bolt hole 228b of the converter housing 220 are provided. By providing the concave portion 229 that aligns with the positioning portion 771 therebetween, positioning when the reservoir plate 70 is attached to the converter housing 220 can be facilitated. In particular, since the positioning portion 771 is provided in the vicinity of the second seal portion 78 of the first seal portion 77, the displacement between the second seal portion 78 and the rib 242 can be suppressed. As a result, the seal of the second seal portion 78 can be ensured more reliably.

  In the power transmission device 20 of the present embodiment, a case side step that overlaps with a part of the housing side step surface 223 formed on the converter housing 220 from the vicinity of the center of the rib 242 of the transaxle case 240 to the case side mating surface 241 side. The first seal portion is formed by forming the surface 243 and guiding the liquid seal member 250 pushed out when the converter housing 220 and the transaxle case 240 are assembled by the case side step surface 243 and the housing side step surface 223. The switching gap 79 between the second seal portion 78 and the second seal portion 78 can be reduced or closed. In particular, since the converter housing 220 and the transaxle case 240 are assembled using the bolt hole 228a and the bolt hole 248a on the extension line of the rib 242, the liquid seal member 250 is firmly pushed out and the opening of the switching gap 79 is made smaller. Can be closed or closed. As a result, the amount of hydraulic oil that leaks from the hydraulic oil storage chamber 65 to the differential chamber 60 is reduced, and the increase in the stirring resistance of the hydraulic oil that acts on the differential ring gear 45 is suppressed.

  In the present embodiment, the second seal portion 78 includes a flat abutting portion 781 having a linear outer edge, and a rib 242 having a S-shaped or crank shape in cross section so that the abutting portion 781 protrudes toward the rib 242 side. However, if the contact between the contact portion 781 and the end surface 242a of the rib 242 is sufficient, the deformation portion 782 causes the contact portion 781 to be formed into the rib 242. It is good also as what does not project to the side, ie, the same plane as the contact part 781. For example, you may form so that the whole 2nd seal | sticker part 78 may incline to the rib 242 side.

  In the present embodiment, the rib 242 is formed in a straight line with a wide width by the contact portion 781 of the second seal portion 78. However, if the second seal portion 78 and the end surface 242a of the rib 242 contact each other. Therefore, the rib 242 may have the same width as the contact portion 781 of the second seal portion 78 or a width smaller than the contact portion 781, and the rib 242 may not be linear. .

  In the power transmission device 20 of the present embodiment, the reservoir plate 70 is attached to the converter housing 220 by the bolt 86c at the bolt hole 76c in the vicinity of the second seal portion 78. However, the reservoir plate 70 is attached to the converter housing 220 at another part. It is good also as what attaches to.

  In the power transmission device 20 of the present embodiment, the converter housing 220 and the transaxle case 240 are assembled by using the bolt holes 228a and the bolt holes 248a on the extension lines of the ribs 242, but the bolt holes are formed on the extension lines of the ribs 242. It is good also as what does not provide.

  In the power transmission device 20 of the present embodiment, the positioning portion 771 is provided in the vicinity of the second seal portion 78 of the first seal portion 77. However, if the positioning portion 771 is the first seal portion 77, the second seal portion 78 is provided. It is good also as what is provided in the site | part slightly separated from.

  In the power transmission device 20 of the present embodiment, the positioning portion 771 is formed in a convex shape extending in the radial direction. However, the positioning portion 771 may have any shape as long as it can be positioned, and may have various shapes such as a concave shape and a wedge shape. Shapes can be used.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  In the power transmission device according to the aspect of the invention, the second seal portion includes a linear contact portion that contacts the rib, and a deformation that elastically deforms by contacting the rib with the contact portion protruding toward the rib side. It can also have a part. In this way, the contact of the contact portion of the second seal portion with the rib can be made more reliable, and the contact from the rib to the contact portion can be held by the elastic deformation of the deformation portion. . As a result, the seal of the second seal portion can be made more reliable.

  In the power transmission device of the present invention, the contact portion is formed to be flat with a predetermined width from an outer edge, and the rib is linear with a width wider than the contact surface of the second seal portion. It can also be formed. If it carries out like this, even if the attachment position shifts | deviates by the tolerance at the time of attachment of a division member, the contact part of a 2nd seal part can be made to contact | abut to a rib reliably. Furthermore, compared to the case where the rib is formed in an arc shape or a curved shape, the rib can be easily processed and the rib necessary for abutting the abutting portion of the second seal portion formed in a linear shape is provided. The wall thickness can be reduced.

  Furthermore, in the power transmission device of the present invention, the partition member is attached to the first case member with a bolt in the vicinity of the end portion of the second seal portion on the side opposite to the first seal portion side. You can also. If it carries out like this, while being able to suppress that the influence (for example, deformation | transformation) by the elastic deformation of the 2nd seal part by being pushed by a rib arises in parts other than the 2nd seal part of a division member, it is 2nd seal part. Can be easily positioned. In this case, the first case member and the second case member may be assembled by bolts on a substantially extended line on the first seal portion side of the second seal portion. By doing so, the first seal side of the second seal portion is also held by the bolt, so that the elastic deformation caused by being pushed by the rib can be caused only in the second seal portion, and the influence of the elastic deformation is affected by the second seal. It can suppress that it arises other than a part.

  The present invention can be used in the power transmission device manufacturing industry.

  20 power transmission device, 22 transmission case, 23 fluid transmission device, 23c lock-up clutch, 23o one-way clutch, 23p pump impeller, 23s stator, 23t turbine runner, 24 oil pump, 25 automatic transmission, 26 input shaft, 28 drive shaft 30 first planetary gear mechanism, 31 sun gear, 32 ring gear, 33a, 33b pinion gear, 34 planetary carrier, 35 second planetary gear mechanism, 36a first sun gear, 36b second sun gear, 37 ring gear, 38a short pinion gear, 38b long pinion gear , 39 planetary carrier, 40 gear mechanism, 41 counter drive gear, 42 counter shaft, 43 counter driven gear, 44 drive pinion gear, 45 Fring gear, 50 differential gear, 51 pinion gear, 52 side gear, 53 pinion shaft, 54 differential case, 55 pinion washer, 56 side washer, 60 differential chamber, 65 hydraulic oil reservoir, 70 reservoir plate, 70s notch, 71 cylindrical portion, 72 flange portion, 76a, 76b, 76c bolt hole, 77 first seal portion, 78 second seal portion 78, 79 switching gap, 81, 82 bearing, 86a, 86b, 86c bolt, 220 converter housing, 221 housing side alignment Surface, 223 housing side step surface, 228a, 228b bolt hole, 229 recess, 240 transaxle case, 241 case side mating surface, 242 rib, 242a end surface, 243 case side step surface, 244 seal gap 771 positioning unit, 781 contact portion, 782 deformed portion, B1, B2 brake, C1, C2, C3, C4 clutch, F1 the one-way clutch.

Claims (5)

A differential ring gear disposed below the drive pinion gear on the input side and meshing with the drive pinion gear, a differential gear coupled to the differential ring gear, a case housing the differential ring gear and the differential gear, and inside the case In a power transmission device comprising: a differential member in which a differential chamber in which the differential ring gear and the differential gear are arranged and a hydraulic oil storage chamber that stores hydraulic oil is partitioned;
The case is a member in which the hydraulic oil storage chamber is formed by the partition member, a first case mating surface is formed on an outer edge, and the first case mating surface is near the bottom of the first case mating surface. A first case member formed with a first step surface stepped inward from the first member, and a second case mating surface which is a member in which the differential chamber is formed by the partition member and is aligned with the first case mating surface And a second case member formed with ribs extending along the outer edge of the partition member from near the bottom of the second case mating surface,
The partition member includes a bottom portion of the outer peripheral portion, and a first seal portion that contacts and seals against the first step surface is formed in a first range from the bottom portion toward one direction. In the second range from the vicinity of the end on the bottom side of the first range to the other direction, an outer edge is formed in a straight line, and a second seal portion is formed that contacts and seals the rib.
A power transmission device characterized by that. The power transmission device according to claim 1,
The second seal portion includes a linear contact portion that contacts the rib, and a deformable portion that protrudes toward the rib side and elastically deforms by contacting the rib.
A power transmission device characterized by that. The power transmission device according to claim 1 or 2,
The contact portion is formed to be flat with a predetermined width from the outer edge,
The rib is linearly formed with a width wider than the contact surface of the second seal portion.
A power transmission device characterized by that. The power transmission device according to any one of claims 1 to 3,
The partition member is attached to the first case member by a bolt in the vicinity of the end of the second seal portion opposite to the first seal portion.
Power transmission device. The power transmission device according to claim 4,
The first case member and the second case member are assembled by a bolt on a substantially extended line on the first seal portion side of the second seal portion,
Power transmission device.