JP5675755B2 - Transmission oil drain structure - Google Patents

Description

According to the present invention, a first casing having a partition wall and a second casing having a side wall portion are combined, and a first chamber is defined inside the first casing and on the opposite side of the second casing with respect to the partition wall. In addition, a second chamber is defined inside the first casing and the second casing and between the partition wall and the side wall, and extends from the first chamber through the partition wall into the second chamber. A first rotating body is provided on the first rotating shaft, and the oil discharged from the transmission is discharged from the second chamber to the oil sump formed at the bottom of the first chamber. Concerning structure.

  The interior of the casing 3 of the transmission is divided into a first chamber 4 and a second chamber 5 by a partition wall 2 having an oil return hole 21, and the oil repelled by a gear 17 rotating inside the second chamber 5 is separated from the partition wall. Patent Document 1 below discloses that oil is returned from the second chamber 5 to the first chamber 4 by being guided to the oil return hole 21 by the oil return rib 20 provided in FIG.

  Further, a transmission wall housing portion 101 in which a rotating drum 691 is housed by a partition wall portion 301 disposed inside the main case 670 of the transmission, and a catch tank 350 that captures and stores oil scraped up by the drum 691. Patent Document 2 below discloses that a predetermined amount of oil is stored in the catch tank 350 and the oil level of the main case 670 is appropriately maintained to reduce oil agitation resistance by a gear or the like. It is.

Japanese Patent Laid-Open No. 11-118027 JP 2009-168150 A

  By the way, when the casing of the transmission is partitioned into a first chamber and a second chamber by a partition, and oil accumulated in the second chamber in which the rotating body is stored is returned to the first chamber from the communication hole of the partition, the interior of the second chamber Because the oil flow that flows down by gravity along the outer peripheral wall surface facing the outer peripheral surface of the rotating body and the oil flow that flows down by gravity along the side wall surface facing the side surface of the rotating body coexist, It is necessary to effectively guide these two oil flows to the communication hole and discharge them to the first chamber.

  The present invention has been made in view of the above circumstances, and an object thereof is to smoothly discharge oil accumulated in the second chamber of the transmission casing to the first chamber.

In order to achieve the above object, according to the first aspect of the present invention, a first casing having a partition wall and a second casing having a side wall portion are coupled to each other inside the first casing and the partition wall. A first chamber is defined on the opposite side of the second casing with respect to the second casing, and a second chamber is defined in the first casing and the second casing and between the partition wall and the side wall portion . A first rotating body is provided on a first rotating shaft that penetrates the partition wall from one room and extends into the second chamber, and oil that scatters with the rotation of the first rotating body from the second chamber to the second chamber . Yan An oil discharge structure of the transmission to be discharged to the oil reservoir formed at the bottom of the first chamber, the second chamber, the partition wall and the side wall portion from the outer peripheral wall surface of said first casing and said second casing After extending upward toward the lower periphery of the first rotor as the first along the outer periphery of the rotary member to form an L-shaped rib extending upwardly, it said in the partition wall outer peripheral surface and said ribs A communication hole for communicating the first chamber and the second chamber is formed at a position surrounded by the first chamber, and the rib is connected to the outer peripheral wall surface and the partition wall on the first casing side , and the second casing. And a second portion connected to the side wall portion, and a tip of a portion of the second portion extending upward along the outer periphery of the first rotating body is the first portion of the first portion . An oil discharge structure for a transmission is proposed, which is located at a position lower than the tip of a portion extending upward along the outer periphery of the rotating body .

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, the second rotating body is connected to the second rotating shaft extending from the first chamber through the partition wall and extending into the second chamber. An oil discharge structure for a transmission is proposed in which the second rotating shaft is located at a position lower than the first rotating shaft and the communication hole.

  The first main input shaft 13 of the embodiment corresponds to the second rotating shaft of the present invention, and the second main input shaft 14 of the embodiment corresponds to the first rotating shaft of the present invention. The first clutch 17 corresponds to the second rotating body of the present invention, the second clutch 18 of the embodiment corresponds to the first rotating body of the present invention, and the transmission case 52 of the embodiment is the first casing of the present invention. The case cover 53 of the embodiment corresponds to the second casing of the present invention, the third wall surface 55c of the embodiment corresponds to the outer peripheral wall surface of the present invention, and the oil pan 56 of the embodiment corresponds to the present invention. The fourth communication hole 60 of the embodiment corresponds to the communication hole of the present invention, and the third rib 65 of the embodiment corresponds to the rib of the present invention.

According to the structure of Claim 1, the 1st casing which has a partition and the 2nd casing which has a side wall part are couple | bonded, and it is a 1st chamber inside the 1st casing and on the opposite side of a 2nd casing with respect to a partition. A first rotating shaft that is inside the first casing and the second casing and that divides the second chamber between the partition wall and the side wall and extends from the first chamber through the partition wall into the second chamber. The first rotating body is provided in After extending upward from the outer peripheral wall surfaces of the first casing and the second casing toward the lower outer periphery of the first rotating body along the partition walls and the side wall portions, the second chamber extends along the outer periphery of the first rotating body. Since the L-shaped rib extending upward is formed, and the communication hole for communicating the first chamber and the second chamber is formed at a position surrounded by the outer peripheral wall surface and the rib in the partition wall, the outer periphery of the first rotating body Oil that scatters and flows down along the outer peripheral wall surface can be reliably captured by the L-shaped ribs and efficiently guided to the communication hole. In addition, the rib includes a first portion connected to the outer peripheral wall surface and the partition wall on the first casing side , and a second portion connected to the outer peripheral wall surface and the side wall portion on the second casing side , and on the outer periphery of the first rotating body of the second portion . tip portion extending upwardly along, so positioned lower than the front end portion extending upwardly along the periphery of the first rotating body of the first portion, the second casing opposite the side surface of the first rotor The oil flowing down along the side wall portion is not easily blocked by the second portion of the low-profile rib provided on the second casing side, and the oil can be efficiently guided to the communication hole.

  According to the second aspect of the present invention, the second rotating body is provided on the second rotating shaft extending through the partition wall from the first chamber and extending into the second chamber, and the second rotating shaft is the first rotating shaft. Therefore, if the amount of oil staying in the lower portion of the second chamber is excessive, the stirring resistance by the second rotating body increases, but the second rotating shaft is positioned lower than the communication hole. Therefore, the stirring resistance by the second rotating body can be reduced by efficiently discharging the oil from the communication hole and reducing the amount of oil remaining in the lower portion of the second chamber.

Skeleton diagram of twin clutch transmission. The figure which looked at the transmission from the engine opposite side (2-2 directional arrow line view of FIG. 5 and FIG. 6). The figure which removed the 1st, 2nd clutch from FIG. FIG. 4 is a view taken along line 4-4 in FIGS. 5 and 6. FIG. 5 is a cross-sectional view taken along line 5-5 in FIGS. 2 and 3; FIG. 6 is a cross-sectional view taken along line 6-6 in FIGS. FIG. 7 is an enlarged sectional view taken along line 7-7 in FIG. The schematic diagram corresponding to FIG.

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

  As shown in FIG. 1, a twin clutch transmission T for an automobile includes a first main input shaft 13 coaxially connected to a crankshaft 11 of an engine E via a torque converter 12, and a first main input shaft 13. And a second main input shaft 14 disposed in parallel to the first main input shaft 14. A cylindrical first sub-input shaft 15 and second sub-input shaft 16 are fitted to the outer circumferences of the first main input shaft 13 and the second main input shaft 14 so as to be relatively rotatable. 13 and the first auxiliary input shaft 15 can be connected via a first clutch 17, and the second main input shaft 14 and the second auxiliary input shaft 16 can be connected via a second clutch 18.

  An output shaft 19 and an idle shaft 20 are arranged in parallel with the first main input shaft 13 and the second main input shaft 14, and a drive gear 21 fixed to the first main input shaft 13 is fixed to the idle shaft 20. The idle gear 22 meshes with an idle gear 22, and the idle gear 22 meshes with a driven gear 23 fixed to the second main input shaft 14. Therefore, the first main input shaft 13 and the second main input shaft 14 always rotate in the same direction during operation of the engine E.

  A second speed drive gear 24, a fourth speed drive gear 25, a sixth speed drive gear 26 and an eighth speed drive gear 27 are supported on the first auxiliary input shaft 15 so as to be relatively rotatable, and the second speed drive gear 24 and the fourth speed drive are supported. The gear 25 can be selectively coupled to the first auxiliary input shaft 15 via a second-speed / four-speed synchronizer 28, and the sixth-speed drive gear 26 and the eighth-speed drive gear 27 are connected to the sixth-speed / 8-speed synchronizer 29. Via the first sub input shaft 15.

  A first speed drive gear 30, a third speed drive gear 31, a fifth speed drive gear 32, and a seventh speed drive gear 33 are supported on the second auxiliary input shaft 16 so as to be relatively rotatable. The first speed drive gear 30 and the third speed drive are supported. The gear 31 can be selectively coupled to the second auxiliary input shaft 16 via a first-speed / third-speed sync device 34, and the fifth-speed drive gear 32 and the seventh-speed drive gear 33 are connected to the fifth-speed-7-speed sync device 35. And can be selectively coupled to the second auxiliary input shaft 16.

  A 1st-2nd driven gear 36, a 3rd-4th driven gear 37, a 5th-6th driven gear 38 and a 7th-8th driven gear 39 are fixed to the output shaft 19, and the 1st-2nd driven gear 36 is fixed. Is simultaneously meshed with the 2nd speed drive gear 24 and the 1st speed drive gear 30, the 3rd speed-4th speed driven gear 37 is meshed with the 4th speed drive gear 25 and the 3rd speed drive gear 31 simultaneously, and the 5th speed-6th speed driven gear 38 is 6th. The 7-speed-8-speed driven gear 39 meshes with the 8-speed drive gear 27 and the 7-speed drive gear 33 simultaneously.

  A reverse idle gear 40 that meshes with the second speed drive gear 24 of the second auxiliary input shaft 16 is supported on the idle shaft 20 so as to be relatively rotatable. The reverse idle gear 40 is connected to the idle shaft 20 via a reverse clutch 41. Can be combined.

  A final drive gear 42 fixed to the output shaft 19 meshes with a final driven gear 44 fixed to the differential gear 43, and axles 45, 45 extending left and right from the differential gear 43 are connected to the left and right drive wheels W, W. The

  Accordingly, when the second clutch 18 is engaged with the first-speed drive gear 30 coupled to the second auxiliary input shaft 16 by the first-speed to third-speed sync device 34, the rotation of the second main input shaft 14 is caused to rotate. → second auxiliary input shaft 16 → first-speed / third-speed synchronizer 34 → first-speed drive gear 30 → first-speed / second-speed driven gear 36 → output shaft 19 → final drive gear 42 → differential gear 43 through the path of the final driven gear 44 The first gear is established.

  When the first clutch 17 is engaged with the second-speed drive gear 24 coupled to the first auxiliary input shaft 15 by the second-speed / four-speed synchronizer 28, the rotation of the first main input shaft 13 is changed to the first clutch 17 → Transmission to the differential gear 43 through the path of the first auxiliary input shaft 15 → second speed-4th speed synchronizer 28 → second speed drive gear 24 → first speed−second speed driven gear 36 → output shaft 19 → final drive gear 42 → final driven gear 44 And the second gear is established.

  In addition, when the second clutch 18 is engaged with the first-speed / third-speed synchronizer 34 with the third-speed drive gear 31 coupled to the second auxiliary input shaft 16, the rotation of the second main input shaft 14 is changed to the second clutch 18 → Transmission to the differential gear 43 through the path of the second auxiliary input shaft 16 → first speed-3 speed synchronizer 34 → third speed drive gear 31 → third speed / 4th speed driven gear 37 → output shaft 19 → final drive gear 42 → final driven gear 44 Then, the third gear is established.

  Further, when the first clutch 17 is engaged in the state where the 4-speed drive gear 25 is coupled to the first auxiliary input shaft 15 by the 2-speed-4 speed synchronizer 28, the rotation of the first main input shaft 13 is changed to the first clutch 17 → Transmission to the differential gear 43 through the path of the first auxiliary input shaft 15 → second speed-4th speed synchronizer 28 → fourth speed drive gear 25 → third speed / 4th speed driven gear 37 → output shaft 19 → final drive gear 42 → final driven gear 44 Then, the fourth gear is established.

  Further, when the second clutch 18 is engaged in the state where the fifth speed drive gear 32 is coupled to the second auxiliary input shaft 16 by the fifth speed-7 speed synchronizer 35, the rotation of the second main input shaft 14 causes the second clutch 18 → Second sub input shaft 16 → 5-speed-7-speed synchronizer 35 → 5-speed drive gear 32 → 5-speed-6-speed driven gear 38 → output shaft 19 → final drive gear 42 → final driven gear 44 is transmitted to the differential gear 43 through the path Then, the fifth gear is established.

  Further, when the first clutch 17 is engaged in the state where the 6-speed drive gear 26 is coupled to the first auxiliary input shaft 15 by the 6-speed-8-speed synchronizer 29, the rotation of the first main input shaft 13 is changed to the first clutch 17 → First sub input shaft 15 → 6-speed-8-speed synchronizer 29 → 6-speed drive gear 26 → 5-speed-6-speed driven gear 38 → output shaft 19 → final drive gear 42 → final driven gear 44 is transmitted to the differential gear 43 through the path. As a result, the sixth gear is established.

  Further, when the second clutch 18 is engaged in the state where the seventh speed drive gear 33 is coupled to the second auxiliary input shaft 16 by the fifth speed-7th speed synchronizer 35, the rotation of the second main input shaft 14 causes the second clutch 18 → Second sub input shaft 16 → 5-speed-7-speed synchronizer 35 → 7-speed drive gear 33 → 7-speed-8-speed driven gear 39 → output shaft 19 → final drive gear 42 → final driven gear 44 is transmitted to the differential gear 43 through the path Then, the seventh gear is established.

  Further, when the first clutch 17 is engaged in the state where the 8-speed drive gear 27 is coupled to the first auxiliary input shaft 15 by the 6-speed-8-speed synchronizer 29, the rotation of the first main input shaft 13 is changed to the first clutch 17 → 1st sub input shaft 15 → 6-speed-8-speed sync device 29 → 8-speed drive gear 27 → 7-speed-8-speed driven gear 39 → output shaft 19 → final drive gear 42 → final driven gear 44 Then, the eighth gear is established.

  When the reverse clutch 41 is engaged, the rotation of the first main input shaft 13 is driven gear 21 → idle gear 22 → idle shaft 20 → reverse clutch 41 → reverse idle gear 40 → second speed drive gear 24 → first speed−second speed. The reverse gear is transmitted in reverse to the differential gear 43 through a path of the driven gear 36 → the output shaft 19 → the final drive gear 42 → the final driven gear 44, and a reverse speed gear is established.

  Next, the structure of the casing of the transmission T will be described with reference to FIGS.

  The casing of the transmission T includes a torque converter case 51 coupled to the engine block, a mission case 52 coupled to the torque converter case 51, and a case cover 53 coupled to the mission case 52. The torque converter case 51 accommodates the torque converter 12 (see FIG. 5), and the transmission chamber and the transmission gears are accommodated in a first chamber 54 formed in the transmission case 52. The differential gear 43 (see FIG. 6) is accommodated so as to straddle the converter case 51 and the mission case 52, and is formed so as to straddle the mission case 52 and the case cover 53. The second chamber 55 accommodates the first clutch 17 (see FIGS. 2 and 5) and the second clutch 18 (see FIG. 2). An oil pan 56 (see FIG. 5) for storing oil is formed at the bottom of the first chamber 54 formed inside the mission case 52. The first chamber 54 and the second chamber 55 are partitioned by a partition wall 52a of the mission case 52 (see FIGS. 5 and 6).

  FIG. 2 shows the transmission T with the case cover 53 removed as viewed in the axial direction from the side opposite to the engine E. An oval shape for attaching the case cover 53 to the partition wall 52a of the mission case 52 (track form for track and field) The split surface 52b is formed, and the second chamber 55 is defined inside the split surface 52b. The shaft ends of the first main input shaft 13, the second main input shaft 14, and the output shaft 19 that pass through the partition wall 52 a of the mission case 52 extend into the second chamber 55, and the first main input shaft 13 has a first end. A clutch 17 is provided, and a second clutch 18 is provided on the second main input shaft 14.

  In FIG. 2, the second clutch 18 is disposed on the upper right side with respect to the first clutch 17, and the second chamber 55 is provided so as to surround the outer periphery of the first clutch 17 and the second clutch 18 with a slight gap. Is formed. In FIG. 2, the rotation directions of the first clutch 17 and the second clutch 18 are both counterclockwise, and the position of the output shaft 19 is on the right side of the first main input shaft 13 and below the second main input shaft 14. The idle shaft 20 is located above the first main input shaft 13 and on the left side of the second main input shaft 14. The position of the differential gear 43 deviates from the second chamber 55 to the lower right side.

  FIG. 3 shows a state in which the first main input shaft 13, the first clutch 17, the second main input shaft 14, the second clutch 18 and the output shaft 19 are removed from FIG. In the partition wall 52a of the mission case 52 facing the inside of the second chamber 55, first to fourth communication holes 57, 58 for returning the oil in the second chamber 55 to the oil pan 56 at the bottom of the first chamber 54, 59, 60 are formed.

  As shown in FIGS. 2 and 3 and FIG. 8 which is a schematic view, from the first wall surface 55a (see FIG. 8) of the second chamber 55 facing the lower outer peripheral surface of the first clutch 17, the lower portion of the first clutch 17 is obtained. The first rib 61 protrudes upward toward the outer peripheral surface, and a first communication hole 57 is formed on the first rib 61 on the side delayed in the rotation direction of the first clutch 17. A second communication hole 58 is formed on the rotation direction leading side. The first communication hole 57 and the second communication hole 58 are connected to the bottom wall portion 52c of the mission case 52 with a downward slope from the position where the first chamber 54 is opened inside the mission case 52, and further from there the oil pan 56 A rib 63 that extends horizontally to the center of the upper surface of the strainer 62 housed therein protrudes (see FIGS. 5 and 6).

  A second wall surface 55b (see FIG. 8) extends obliquely downward from a position facing the upper outer peripheral surface of the second clutch 18 toward the rotational direction advance side of the second clutch 18, and a lower end of the second wall surface 55b. The second rib 64 protrudes from the portion toward the outer peripheral surface of the side portion of the second clutch 18. A third communication hole 59 that allows the second chamber 55 to communicate with the first chamber 54 is formed in the partition wall 52 a that faces the position sandwiched between the second wall surface 55 b and the second rib 64. The third communication hole 59 opens directly to the upper portion of the first chamber 54 inside the mission case 52 (see FIG. 5).

  A third wall surface 55c (see FIG. 8) extends downward from a position facing the upper outer peripheral surface of the second clutch 18 toward the rotation direction delay side of the second clutch 18, and a lower end portion of the third wall surface 55c. The third rib 65 is provided in the first. The third rib 65 extends obliquely upward from the lower end of the third wall surface 55 c toward the lower outer peripheral surface of the second clutch 18, then bends approximately 90 ° and rotates along the lower outer peripheral surface of the second clutch 18. It extends obliquely upward to the direction advance side, and is formed in an L shape as a whole. A fourth communication hole 60 that allows the second chamber 55 to communicate with the first chamber 54 is formed in the partition wall 52 a facing the position surrounded by the third wall surface 55 c and the third rib 65.

As is apparent from FIGS. 6 and 7, the third rib 65 is formed across the mission case 52 and the case cover 53, and includes a first portion 52 d that is a part of the mission case 52, and a case cover. And a second portion 53a which is a part of 53. While the first portion 52d and the second portion 53a is generally the same shape, the second portion 53a continuous with the third wall 55c and the side wall portion 53b of the Ke Sukaba 53 side (see FIG. 6) on the outer periphery of the second clutch 18 The tip of the portion extending upward along the first wall 52c on the side of the transmission case 52 and the first portion 52d continuous with the partition wall 52a is a distance d from the tip of the portion extending upward along the outer periphery of the second clutch 18. It is low.

  As shown in FIGS. 4 and 6, the fourth communication hole 60 extends downward from the position where the fourth communication hole 60 opens into the first chamber 54 inside the mission case 52 toward the differential gear 43 toward the inner wall surface of the mission case 52. An oil return passage 66 having a letter-shaped cross section and a groove-like oil return passage 67 extending downward from the downstream end thereof are formed.

  As shown in FIGS. 2, 3, and 8, the fourth rib that extends to the rotation direction advance side along the outer peripheral surface of the first clutch 17 on the rotation direction delay side of the first clutch 17 with respect to the first communication hole 57. 68 is arranged. A fifth rib 69 extending along the outer peripheral surface of the first clutch 17 is arranged on the side of the second communication hole 58 in the rotational direction of the first clutch 17.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  As shown in FIG. 8, both the first clutch 17 and the second clutch 18 rotate counterclockwise, and the oil adhering to the outer peripheral surface is tangentially directed toward the rotational direction advance side, as indicated by the dashed arrow. Scatter. Further, the oil attached to the inner peripheral surface of the second chamber 55 flows downward due to gravity, and when the first clutch 17 and the second clutch 18 stop rotating, the oil attached to the outer peripheral surface drops by gravity.

  The oil splashed in the tangential direction from the outer peripheral surfaces of the first and second clutches 17 and 18 adheres to the entire inner peripheral wall surface of the second chamber 55, but a part of the oil adhered to the upper (ceiling side) wall surface thereof. Drops on the lower (floor side) wall surface, so that the oil collected on the lower wall surface flows down in the direction of arrow a along the lower wall surface. On the other hand, the oil splashed in the tangential direction from the outer peripheral surface of the first clutch 17 moves in the direction of arrow b along the inner peripheral wall surface of the second chamber 55 facing the outer peripheral surface of the first clutch 17.

  When the oil flowing in the opposite direction collides on the first wall surface 55a of the second chamber 55, not only bubbles are generated in the oil, but also the oil pan in the first chamber 54 through the first and second communication holes 57 and 58. 56, there is a problem that the oil is not smoothly discharged. However, since the first rib 61 is provided between the first and second communication holes 57 and 58, the oil flowing in the direction of the arrow b is in front of the first rib 61. The oil discharged from the first communication hole 57 to the first chamber 54 and flowing in the direction of the arrow a is discharged from the second communication hole 58 in front of the first rib 61 to the first chamber 54, so The oil is smoothly discharged into the one chamber 54.

  Further, when oil scattered in the direction of the arrow b from the outer peripheral surface of the first clutch 17 strongly collides with the inner peripheral wall surface of the second chamber 55, bubbles are likely to be generated, but this position is along the outer peripheral surface of the first clutch 17. Since the fourth rib 68 is provided on the second rib 68, the oil scattered downward is caused to collide with the fourth rib 68 before accelerating by gravity, thereby suppressing the generation of bubbles. Further, when the oil splashed in the direction of arrow c from the outer peripheral surface of the first clutch 17 collides with the oil flowing down in the direction of arrow a along the lower wall surface of the second chamber 55, bubbles are generated or the oil flows. However, the fifth rib 69 divides the oil flow in the direction of the arrow a from the oil flow in the direction of the arrow c to solve the above problem.

  The oil that has passed through the first and second communication holes 57 and 58 from the second chamber 55 side to the first chamber 54 side flows on the bottom wall portion 52c of the transmission case 52 and the upper surface of the rib 63 and on the upper surface of the strainer 62. It falls and is returned to the oil pan 56 (see FIG. 5).

  When oil splashed in the direction of the arrow d along the second wall surface 55b of the second chamber 55 from the outer peripheral portion of the second clutch 18 collides with oil scattered from the outer peripheral surface of the first clutch 17, bubbles may be generated. However, by capturing the oil splashed in the direction of the arrow d by the second rib 64, the oil is prevented from colliding with the oil splashed from the outer peripheral surface of the first clutch 17, and the generation of bubbles is suppressed. Oil captured by the rib 64 can be discharged from the third communication hole 59 to the first chamber 54.

  The function of the third rib 65 is similar to the function of the first rib 61, and the oil flowing down in the direction of arrow e along the third wall surface 55 c of the second chamber 55 and the outer peripheral surface of the second clutch 18. By blocking the oil scattered in the direction of the arrow f by the third rib 65 so as to prevent a frontal collision, the oil flowing in the direction of the arrow e is captured by the third rib 65 while preventing the generation of bubbles due to the collision. It can be led to the communication hole 60 and discharged smoothly into the first chamber 54.

  At this time, the third rib 65 extends obliquely upward from the lower end of the third wall surface 55c toward the lower outer peripheral surface of the second clutch 18, and then bends approximately 90 ° to the lower outer peripheral surface of the second clutch 18. Therefore, the oil that flows down in the direction of arrow e by gravity along the third wall surface 55c of the second chamber 55 is reliably captured and is captured from the fourth communication hole 60 through the first chamber 54. Can be discharged efficiently.

  Further, in the vicinity of the second clutch 18 inside the second chamber 55, in addition to the oil adhering to the third wall surface 55 c facing the outer peripheral surface of the second clutch 18, the case cover 53 facing the side surface of the second clutch 18 There is oil adhering to the side wall 53b (see FIG. 6). When the oil adhering to the side wall portion 53b flows downward toward the fourth communication hole 60 by gravity (see FIG. 6), the second portion 53a of the third rib 65 connected to the side wall portion 53b is the fourth. If the oil protrudes above the communication hole 60, the oil may be blocked by the second portion 53 a and cannot flow into the fourth communication hole 60.

  However, according to the present embodiment, the height of the tip of the second portion 53a of the third rib 65 is set to be lower than the height of the tip of the first portion 52d by the distance d (see FIG. 7). When the oil adhering to the side wall portion 53b flows down toward the fourth communication hole 60 in the direction of the arrow g due to gravity, the oil is not easily blocked by the second portion 53a of the third rib 65 and smoothly enters the fourth communication hole 60. Can flow in.

  The oil that has passed through the fourth communication hole 60 from the second chamber 55 and has flowed into the first chamber 54 flows through oil return passages 66 and 67 provided on the inner wall surface of the transmission case 52 and is supplied to the differential gear 43. After the gear 43 is lubricated, it is returned to the oil pan 56 (see FIG. 6).

  As described above, according to the present embodiment, the oil in the second chamber 55 can be smoothly discharged into the first chamber 54, and the first clutch 17 and the second clutch 18 disposed in the second chamber 55. The oil stir resistance can be reduced by preventing the oil from being immersed in the oil. Further, since the second chamber 55 has an oval shape surrounding the first clutch 17 and the second clutch 18, the oil scattered from the outer peripheral surfaces of the first and second clutches 17 and 18 is immediately put into the second chamber 55. It is possible to minimize the generation of bubbles by receiving on the inner peripheral wall surface.

  In particular, the first main input shaft 13 that supports the first clutch 17 below the second main input shaft 14 is located at a low position in the second chamber 55, so that if the amount of oil accumulated in the second chamber 55 becomes excessive, Although there is a problem that the stirring resistance of the one clutch 17 increases, the first main input shaft 13 is located below the fourth communication hole 60, so that oil is smoothly discharged from the fourth communication hole 60 to the first chamber 54. Thus, the amount of oil accumulated in the second chamber 55 can be reduced, and the oil stirring resistance by the first clutch 17 can be reduced.

  The rotation directions of the first main input shaft 13 and the second main input shaft 14 are both counterclockwise in FIGS. 2 and 8, and the second main input shaft 14 is positioned on the upper right side of the first main input shaft 13. Therefore, the oil attached to the ceiling wall portion of the inner peripheral wall surface of the second chamber 55 flows down by gravity, and the oil scattering direction from the outer peripheral surfaces of the first and second clutches 17 and 18 (see FIG. 8). (The direction of arrow b or arrow d) is the same, so that the oil adhering to the ceiling wall portion can flow smoothly and be discharged from the first communication hole 57 or the third communication hole 59.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the first and second rotating bodies of the present invention are not limited to the clutches 17 and 18 of the embodiment, and may be rotating bodies such as gears.

13 First main input shaft (second rotary shaft)
14 Second main input shaft (first rotation shaft)
17 First clutch (second rotating body)
18 Second clutch (first rotating body)
52 Mission case (first casing)
52a Partition wall 52d First portion 53 Case cover (second casing)
53a second part
53b side wall 54 1st chamber 55 2nd chamber 55c 3rd wall surface (outer peripheral wall surface)
56 Oil pan (oil sump)
60 4th communication hole (communication hole)
65 Third rib (rib)

Claims (2)

A first casing (52) having a partition wall (52a) and a second casing (53) having a side wall portion (53b) are coupled to each other inside the first casing (52) and to the partition wall (52a). The first chamber (54) is partitioned on the opposite side of the second casing (53), and the partition (52a) and the inside of the first casing (52) and the second casing (53) A first rotation that divides the second chamber (55) between the side wall portions (53b) and extends from the first chamber (54) through the partition wall (52a) into the second chamber (55). The shaft (14) is provided with a first rotating body (18), and oil scattered with the rotation of the first rotating body (18) from the second chamber (55) to the bottom of the first chamber (54). Transmission to the oil sump (56) formed in In the oil discharge structure,
In the second chamber (55), the first casing (52) and the second casing (53) extend from the outer peripheral wall surface (55c) along the partition wall (52a) and the side wall portion (53b) . An L-shaped rib (65) extending upward along the outer periphery of the first rotating body (18) after extending upward toward the lower outer periphery of the one rotating body (18);
A communication hole (60) for communicating the first chamber (54) and the second chamber (55) is formed at a position surrounded by the outer peripheral wall surface (55c) and the rib (65) in the partition wall (52a) . ,
The rib (65) includes the outer peripheral wall surface (55c ) on the first casing (52) side , the first portion (52d) connected to the partition wall (52a), and the outer peripheral wall surface ( on the second casing (53) side). 55c) and a second portion (53a) connected to the side wall portion (53b), and the tip of the portion of the second portion (53a) extending upward along the outer periphery of the first rotating body (18) is , oil discharge structure of the transmission, characterized in that along the outer periphery is located lower than the tip portion extending above said first rotating body (18) of said first portion (52 d).   A second rotating body (17) is provided on a second rotating shaft (13) extending from the first chamber (54) through the partition wall (52a) into the second chamber (55), 2. The oil discharge structure for a transmission according to claim 1, wherein the two rotation shafts (13) are positioned lower than the first rotation shaft (14) and the communication hole (60).

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