JP2013177958A - Casing structure of transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent a film surface vibration while minimizing increase in weight of a case cover of a casing of a transmission.SOLUTION: A first spherical wall 61 which protrudes outward in a dome shape around the center of an axial line L1 of a first axis 13, a second spherical wall 66 which protrudes outward in a dome shape around the center of an axial line L2 of the second axis 14, and a third spherical wall 71 which protrudes outward in a dome shape overlapping a part of the first spherical wall 61 and a part of the second spherical wall 66 are formed in a case cover 54 fastened to an opening of a transmission case 52, so that the three spherical walls 61, 66, 71 are reinforced with each other compared with the case when the first to third spherical walls 61, 66, 71 are independently formed from each other, and the case cover 54 is improved in rigidity. Thereby, the film surface vibration of the case cover 54 can be effectively prevented without the need for any special reinforcement rib, and also the increase in weight of the case cover 54 can be minimized.

Description

  The present invention provides a transmission casing structure in which a case cover facing the shaft ends of the first and second shafts is coupled to an opening portion of a transmission case that houses a first shaft and a second shaft arranged in parallel to each other. About.

  A hemispherical dome wall that covers the centrifugal clutch is formed on the cover of the transmission case that houses the belt type continuously variable transmission of the swing type power unit of the motorcycle, and outer ribs that extend radially on the outer and inner surfaces of the dome wall. Patent Document 1 below discloses that the cover of the transmission case is reinforced by forming the inner rib and suppressing the membrane vibration.

JP 2009-30715 A

  By the way, in the above-mentioned conventional one, since one hemispherical dome wall is formed independently, the rigidity of the cover cannot be sufficiently increased. In addition, there is a problem in that the weight of the cover increases.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to effectively suppress the vibration of the membrane surface while minimizing the increase in the weight of the case cover of the casing of the transmission.

  In order to achieve the above object, according to the first aspect of the present invention, the first and second portions are disposed in the opening of the transmission case that houses the first shaft and the second shaft that are arranged in parallel to each other. In a transmission casing structure in which a case cover facing a shaft end of a shaft is coupled, the case cover has a first spherical wall projecting out of the case cover around the axis of the first shaft in a dome shape, A second spherical wall projecting out of the case cover around the axis of the second axis, and a part of the first spherical wall and a part of the second spherical wall overlapping the outer side of the case cover; And a third spherical wall projecting in a dome shape. A transmission casing structure is proposed.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, the shaft end of the third shaft disposed in parallel with the first and second shafts is set to the center of the third spherical wall. A transmission casing structure is proposed in which oil is supplied to the inside of the third shaft through an oil passage that is opposed and extends from the center of the third spherical wall.

  According to the invention described in claim 3, in addition to the configuration of claim 1 or claim 2, the dome projects outward from the central portion of at least one of the first and second spherical walls. A fourth spherical wall is formed, a bearing support portion is formed on the inner surface of the outer peripheral portion of the fourth spherical wall, and a bearing support portion that supports the one spherical wall is formed on the bearing. A transmission casing structure characterized by supporting the shaft end of one shaft is proposed.

  According to a fourth aspect of the present invention, in addition to the structure of any one of the first to third aspects, the oil extends from the center of at least one of the first and second spherical walls. A transmission casing structure is proposed in which oil is supplied to one of the first and second shafts by a road.

  According to the invention described in claim 5, in addition to the configuration of any one of claims 1 to 4, at least one of the first and second spherical walls faces outward. A transmission casing structure is proposed in which a plurality of reinforcing portions protruding and extending radially are formed.

  According to the invention described in claim 6, in addition to the configuration of any one of claims 1 to 5, radial direction from the center of at least one of the first and second spherical walls. A first rib extending outward and a second rib extending radially outward from the outer peripheral portion of the one spherical wall are formed so as to project outward from the outer surface of the one spherical wall, and the first A transmission casing structure is proposed in which the ridge line of at least one rib of the second rib and the other rib are connected by an overhanging wall projecting outward from the outer surface of the one spherical wall. .

  According to the invention described in claim 7, in addition to the structure of claim 6, an attachment portion for fixing the transmission case to the vehicle body is provided between the radially outer ends of the first and second ribs. A transmission casing structure is proposed.

  According to an eighth aspect of the present invention, in addition to the configuration of the sixth or seventh aspect, the overhanging wall connects the ridge line of the first rib and the ridge line of the second rib. A transmission casing structure is proposed.

  The first main input shaft 13 of the embodiment corresponds to the first axis of the present invention, the second main input shaft 14 of the embodiment corresponds to the second axis of the present invention, and the output shaft of the embodiment. Reference numeral 19 corresponds to the third axis of the present invention.

  According to the configuration of the first aspect, the case cover coupled to the opening of the transmission case that houses the first shaft and the second shaft of the transmission is formed in a dome shape outside the case cover with the axis of the first shaft as a center. A first spherical wall projecting, a second spherical wall projecting out of the case cover around the axis of the second axis, and a part of the first spherical wall and a part of the second spherical wall. Since the third spherical wall projecting in a dome shape is formed outside the case cover, the three spherical walls are mutually connected compared to the case where the first to third spherical walls are formed independently of each other. The case cover rigidity can be increased and the case cover can be effectively stiffened without the need for special reinforcing ribs. Can be suppressed.

  According to the rigidity of the second aspect of the present invention, an oil passage that extends from the center of the third spherical wall with the shaft end of the third shaft disposed parallel to the first and second axes facing the center of the third spherical wall. Since the oil is supplied to the inside of the third shaft, the oil can be supplied more efficiently than the case where the oil is supplied from the radially outer side to the inner side at the intermediate portion in the longitudinal direction of the third shaft.

  According to the third aspect of the present invention, since the dome-shaped fourth spherical wall projecting outward from the central portion of at least one of the first and second spherical walls is provided, the combination of the two spherical walls is used. Not only can the rigidity of the case cover be further increased, but a bearing support portion for supporting the bearing of one of the first and second shafts is formed on the inner surface of the outer peripheral portion of the fourth spherical wall. Thus, the rigidity of the case cover can be further increased.

  According to the configuration of claim 4, oil is supplied to the inside of one of the first and second shafts through an oil passage extending from the center of at least one of the first and second spherical walls. Lubricating can be performed more efficiently than in the case of refueling from the outside in the radial direction to the inside in the middle portion in the longitudinal direction.

  According to the fifth aspect of the present invention, since the plurality of reinforcing portions projecting outward and extending radially are formed on at least one of the first and second spherical walls, the first spherical wall or the second spherical wall is formed. The rigidity of the wall can be further increased by the reinforcing portion.

  According to the sixth aspect of the present invention, the first rib extending radially outward from the center of at least one of the first and second spherical walls, and the first rib extending radially outward from the outer peripheral portion of the one spherical wall. The two ribs are formed so as to project outward from the outer surface of one spherical wall, and the ridge line of at least one of the first and second ribs and the other rib are formed on the outer surface of one spherical wall. Since the first and second ribs and the projecting wall cooperate, the rigidity of the first spherical wall or the second spherical wall can be further increased.

  According to the seventh aspect of the present invention, since the mounting portion for fixing the transmission case to the vehicle body is provided between the radially outer ends of the first and second ribs, the strength of the mounting portion is increased by the first and second ribs. The transmission case can be firmly attached to the vehicle body.

  Further, according to the configuration of the eighth aspect, since the overhanging wall connects the ridge line of the first rib and the ridge line of the second rib, the overhanging wall from at least one spherical surface of the first and second spherical walls It is possible to effectively increase the rigidity of the first spherical wall or the second spherical wall by securing the maximum amount of overhang.

Skeleton diagram of twin clutch transmission. (First embodiment) The figure which looked at the casing of the transmission from the opposite side to an engine. (First embodiment) The figure which shows the shape of the outer surface of a case cover. (First embodiment) FIG. 4 is a sectional view taken along line 4-4 of FIG. (First embodiment) The figure which shows the shape of the outer surface of a case cover. (Second Embodiment) The figure which shows the cross-sectional shape of a case cover. (Third embodiment) The figure which shows the cross-sectional shape of a case cover. (Fourth embodiment)

First embodiment

  Hereinafter, a first embodiment 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 first speed drive gear 24, a third speed drive gear 25, a fifth speed drive gear 26 and a seventh speed drive gear 27 are supported on the first auxiliary input shaft 15 so as to be relatively rotatable, and the first speed drive gear 24 and the third speed drive are supported. The gear 25 can be selectively coupled to the first auxiliary input shaft 15 via a first-speed / third-speed sync device 28, and the fifth-speed drive gear 26 and the seventh-speed drive gear 27 are connected to the fifth-speed-7-speed sync device 29. Via the first sub input shaft 15.

  A second speed drive gear 30, a fourth speed drive gear 31, a sixth speed drive gear 32, and an eighth speed drive gear 33 are supported on the second auxiliary input shaft 16 so as to be relatively rotatable, and the second speed drive gear 30 and the fourth speed drive are supported. The gear 31 can be selectively coupled to the second auxiliary input shaft 16 via a second-speed / four-speed synchronizer 34, and the sixth-speed drive gear 32 and the eighth-speed drive gear 33 are connected to the sixth-speed / 8-speed synchronizer 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 1st speed drive gear 24 and the 2nd speed drive gear 30, the 3rd speed-4th speed driven gear 37 is meshed with the 3rd speed drive gear 25 and the 4th speed drive gear 31 simultaneously, and the 5th speed-6th speed driven gear 38 is 5th. The 7th speed-8th driven gear 39 meshes with the 7th speed drive gear 27 and the 8th speed drive gear 33 simultaneously.

  A reverse idle gear 40 that meshes with the first 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

  Therefore, when the first clutch 17 is engaged with the first-speed drive gear 24 coupled to the first sub-input shaft 15 by the first-speed to third-speed sync device 28, the rotation of the first main input shaft 13 is caused to rotate. → first auxiliary input shaft 15 → first speed-3 speed synchronizer 28 → first speed drive gear 24 → 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 second clutch 18 is engaged with the second-speed drive gear 30 coupled to the second auxiliary input shaft 16 by the second-fourth-speed synchronizer 34, 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 → second speed-4th speed synchronizer 34 → second speed drive gear 30 → first speed−second speed driven gear 36 → output shaft 19 → final drive gear 42 → final driven gear 44 And the second gear is established.

  Further, when the first clutch 17 is engaged with the first-speed / third-speed synchronizer 28 in which the third-speed drive gear 25 is coupled to the first auxiliary input shaft 15, 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 → first speed-3rd speed synchronizer 28 → third speed drive gear 25 → 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 second clutch 18 is engaged with the second-speed / four-speed synchronizer 34 with the fourth-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 → second speed-4th speed synchronizer 34 → fourth speed drive gear 31 → 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 first clutch 17 is engaged in the state where the fifth speed drive gear 26 is coupled to the first sub input shaft 15 by the fifth speed-7 speed sync device 29, the rotation of the first main input shaft 13 is changed to the first clutch 17 → First sub input shaft 15 → 5-speed-7-speed synchronizer 29 → 5-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. Then, the fifth gear is established.

  When the 6-speed drive gear 32 is coupled to the second auxiliary input shaft 16 with the 6-speed-8-speed synchronizer 35 and the second clutch 18 is engaged, the rotation of the second main input shaft 14 is changed to the second clutch 18 → Second sub-input shaft 16 → 6-speed-8-speed synchronizer 35 → 6-speed drive gear 32 → 5-speed-6-speed driven gear 38 → output shaft 19 → final drive gear 42 → final driven gear 44 As a result, the sixth gear is established.

  Further, when the first clutch 17 is engaged in the state where the seventh-speed drive gear 27 is coupled to the first auxiliary input shaft 15 by the fifth-speed-7-speed synchronization device 29, the rotation of the first main input shaft 13 is changed to the first clutch 17 → First sub input shaft 15 → 5-speed-7-speed synchronizer 29 → 7-speed drive gear 27 → 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 second clutch 18 is engaged in the state where the 8-speed drive gear 33 is coupled to the second auxiliary input shaft 16 by the 6-speed-8-speed synchronizer 35, the rotation of the second main input shaft 14 causes the second clutch 18 → Second sub-input shaft 16 → 6-speed-8-speed sync device 35 → 8-speed drive gear 33 → 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 → first 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.

  FIG. 2 is a view of the transmission T as viewed from the opposite side of the engine E. The casing of the transmission T is fastened to the torque converter case 51 fastened to the engine block by a plurality of bolts 53. Then, the outer periphery of the case cover 54 is fastened to the mission case 52 by a plurality of bolts 55. A valve block 56 that controls the hydraulic pressure supplied to the torque converter 12, the first clutch 17, the second clutch 18, the reverse clutch 41, the hydraulic actuator of each synchro device, and the like is fastened to the front side surface of the transmission case 52.

  The case cover 54 is a substantially oval (track and field track-type) plate-like member that is inclined from the front lower side to the rear upper side, and has a first main input shaft 13 and a second main input shaft 14 on its inner surface. The shaft ends of the output shaft 19 and the idle shaft 20 are facing. The second main input shaft 14 is arranged rearward and upward with respect to the first main input shaft 13 arranged on the front side of the mission case 52, and the rear lower side of a straight line connecting the first main input shaft 13 and the second main input shaft 14 The output shaft 18 is disposed at the front of the straight line, and the idle shaft 20 is disposed in front of the straight line. Therefore, the positions of the first main input shaft 13, the second main input shaft 14, the output shaft 19 and the idle shaft 20 are diamond-shaped. Corresponds to the positions of the four vertices. Further, the differential gear 43 is disposed below the transmission case 52 that deviates from the outline of the case cover 54.

  Next, the shape of the case cover 54 will be described in detail with reference to FIGS.

  The case cover 54 includes an annular flange portion 58 along a split surface 57 coupled to the mission case 52. The flange portion 58 is formed with a plurality of boss portions 59 through which the bolts 55 penetrate at predetermined intervals. The inner peripheral side of the flange portion 58 is basically connected by a flat flat wall 60. From the front part of the flat wall 60 of the case cover 54, a dome-shaped first spherical wall 61 centering on the axis L1 of the first main input shaft 13 bulges outward. The first spherical wall 61 is constituted by a part of a spherical surface, and the outer peripheral portion thereof is connected to the planar wall 60 via an annular wall 62 that stands in the direction of the axis L1.

  An annular bearing support portion 63 protrudes inwardly on the inner surface of the first spherical wall 61, and the outer end portion of the first clutch 17, that is, the first main input shaft 13 by a bearing 64 fitted to the bearing support portion 63. The shaft end of is supported. An oil passage 65 made of a pipe material extends inward from the center of the first spherical wall 61, and oil is supplied to the first main input shaft 13 through the oil passage 65.

  From the rear portion of the flat wall 60 of the case cover 54, a dome-shaped second spherical wall 66 centering on the axis L2 of the second main input shaft 14 bulges outward. The second spherical wall 66 is constituted by a part of a spherical surface, and the outer peripheral portion thereof is connected to the flat wall 60 via an annular wall 67 standing in the direction of the axis L2. Further, from the center of the second spherical wall 66, a dome-shaped fourth spherical wall 68 formed of a part of a spherical surface bulges outward. The second spherical wall 66 and the fourth spherical wall 68 are arranged concentrically around the axis L <b> 2, but the radius of curvature of the fourth spherical wall 68 is set smaller than the radius of curvature of the second spherical wall 66. An annular bearing support portion 69 projects inwardly on the inner surface of the boundary between the second spherical wall 66 and the fourth spherical wall 68, and the outer end of the second clutch 18 is supported by a bearing 70 fitted to the bearing support portion 69. Part, that is, the shaft end of the second main input shaft 14 is supported.

  Further, a dome-shaped third spherical wall 71 centering on the axis L <b> 3 of the output shaft 19 bulges outward from the flat wall 60 of the case cover 54. The third spherical wall 71 overlaps the outer peripheral portion of the first spherical wall 61 and the outer peripheral portion of the second spherical wall 66, and further bulges outward from the outer peripheral portion of the first spherical wall 61 and the second spherical wall 66. . An oil passage 74 made of a pipe material extends inward from the center of the third spherical wall 71, and oil is supplied to the output shaft 19 through the oil passage 74.

  Six ribs 72 extending radially about the axis L1 are formed on the first spherical wall 61, and one of the ribs 72 extends to the axis L3 at the center of the third spherical wall 71. The other rib 72 extends to the axis L <b> 2 at the center of the second spherical wall 33. Further, on the second spherical wall 66, in addition to the other rib 72 extending from the first spherical wall 61, three further ribs 72 extending radially about the axis L2 are formed. Oil passages for supplying oil into the first main input shaft 13, the second main input shaft 14 and the output shaft 19 are formed inside these ribs 72.

  As described above, according to the present embodiment, the first spherical wall 61 projecting outwardly in a dome shape around the axis L1 of the first main input shaft 13 on the case cover 54 of the casing of the transmission T, and the first (2) A second spherical wall 66 projecting outwardly about the axis L2 of the main input shaft 14, and a part of the first spherical wall 61 and a part of the second spherical wall 66 are overlapped with each other to form a dome outward Since the protruding third spherical wall 71 is formed, the first to third spherical walls 61, 66, 71 are formed in comparison with the case where the first to third spherical walls 61, 66, 71 are formed independently of each other. Since the rigidity of the case cover 54 is enhanced by mutually reinforcing the 71, it becomes possible to effectively suppress the membrane vibration of the case cover 54 without requiring a special reinforcing rib. The increase in weight is also minimized .

  Moreover, since the dome-shaped fourth spherical wall 68 projects further outward from the center of the second spherical wall 66, the second spherical wall 66 and the fourth spherical wall 68 reinforce each other, and the rigidity of the case cover 54 is increased. Further enhanced. The first to third spherical walls 61, 66, 71 are reinforced by a plurality of radially extending ribs 72 to further increase the rigidity. The ribs 72 are formed on the first main input shaft 13 and the second main input. Since the oil passage for supplying oil to the shaft 14 and the output shaft 19 is formed, it is not necessary to provide a special reinforcing rib, and the case cover 54 is reduced in weight.

  Further, annular bearing support portions 63 and 69 for supporting the bearings 64 and 70 are formed on the inner surface of the first spherical wall 61 and the inner surfaces of the boundary portions of the second and fourth spherical walls 66 and 68, respectively. The bearing support parts 63 and 69 can further increase the rigidity of the case cover 54.

Second embodiment

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, the second spherical wall 66 of the first embodiment is formed with a plurality of reinforcing portions 73 extending radially outward from the outer periphery of the fourth spherical wall 68 at the center. It is. The reinforcing portions 73 are formed so as to project outward from the outer surface of the second spherical wall 66.

  According to the second embodiment, the reinforcing portions 73... Add an uneven shape to the cross section of the second spherical wall 66, thereby increasing the rigidity of the second spherical wall 66 and causing film vibration of the case cover 54. More effectively suppressed.

Third embodiment

  Next, a third embodiment of the present invention will be described with reference to FIG.

  The third embodiment is a modification of the first embodiment, in which a protruding wall 75 is formed on the case cover 54 to further increase its rigidity. That is, on the outer surface of the case cover 54, a first rib 76 that extends linearly outward from the center of the second spherical wall 66 beyond the outer peripheral portion and radially outward from the outer peripheral portion of the second spherical wall 66. A second rib 77 extending linearly is formed so as to protrude outward.

  The first rib 76 and the second rib 77 are inclined so that the distance between the first rib 76 and the second rib 77 decreases toward the outside in the radial direction, and a short cylindrical mounting portion 78 is formed between the tips of the first rib 76 and the second rib 77. A female screw hole 78a is formed inside the mounting portion 78, and the transmission case 52 is supported by the vehicle body by fastening a mounting bracket (not shown) fixed thereto with a bolt to the vehicle body. A substantially quadrangular region surrounded by the second spherical wall 66, the first rib 76, the second rib 77, and the mounting portion 78 is covered with the overhanging wall 75. One side of the overhanging wall 75 is connected to the highest protruding ridgeline 77a of the second rib 77, and the other side of the overhanging wall 75 is slightly lower than the highest protruding ridgeline 76a of the first rib 76. Connected to.

  The chain line in FIGS. 6B and 6C corresponds to the first embodiment, and the portion sandwiched between the first rib 76 and the second rib 77 is recessed inside the case cover 54. Yes. On the other hand, in the present embodiment, the case cover 54 is thickened by the portion sandwiched between the first rib 76 and the second rib 77 projecting outside the case cover 54.

  As described above, according to the present embodiment, the wall surface of the portion sandwiched between the first rib 76 and the second rib 77 is bulged so as to protrude to the outer surface side of the case cover 54, thereby The rigidity of the cover 54 can be further increased. Moreover, since the radially outer ends of the first rib 76 and the second rib 77 are connected to the mounting portion 78 that fixes the transmission case 52 to the vehicle body, the strength of the mounting portion 78 is increased and the transmission case 52 is firmly fixed to the vehicle body. be able to.

Fourth embodiment

  Next, a fourth embodiment of the present invention will be described with reference to FIG.

  In the third embodiment, one side of the overhanging wall 75 is connected to the ridgeline 77 a of the second rib 77, and the other side of the overhanging wall 75 is slightly lower than the ridgeline 76 a of the first rib 76. However, in the second embodiment, one side and the other side of the overhanging wall 75 are connected to the ridgeline 77a of the second rib 77 and the ridgeline 76a of the first rib 76, respectively. Thereby, there is no depression between the first rib 76 and the second rib 77, and the ridge line 76 a of the first rib 76 and the ridge line 77 a of the second rib 77 are linearly connected by the protruding wall 75. 7B, a plurality of ribs 66a... Are formed radially on the inner surface of the second spherical wall 66, and one of the ribs 66a (see FIG. 7E). Reinforced across the inner surface of the overhanging wall 75.

  As described above, according to the present embodiment, in addition to the operational effects of the third embodiment, the amount of overhanging of the overhanging wall 75 is ensured as large as possible, and the case cover 54 is reinforced more effectively. Can do.

  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, although the transmission T of the embodiment is of a twin clutch type, the present invention can be applied to any other type of transmission.

  The first to third axes of the present invention are not limited to the first main input shaft 13, the second main input shaft 14 and the output shaft 19 of the embodiment.

  In the embodiment, the fourth spherical wall 68 is formed on the second spherical wall 66, but it may be formed on the first spherical wall 61.

  In the embodiment, the reinforcing portions 73 and the overhanging wall 75 are formed on the second spherical wall 66, but they may be formed on the first spherical wall 61.

13 First main input shaft (first shaft)
14 Second main input shaft (second axis)
19 Output shaft (3rd axis)
52 mission case 54 case cover 61 first spherical wall 65 oil passage 66 second spherical wall 68 fourth spherical wall 69 bearing support portion 70 bearing 71 third spherical wall 73 reinforcement portion 74 oil passage 75 overhanging wall 76 first rib 76a Ridge line 77 Second rib 77a Ridge line 78 Mounting portion L1 First axis axis L2 Second axis axis L3 Third axis axis

Claims (8)

Opposite the shaft ends of the first and second shafts (13, 14) in the opening of the transmission case (52) that houses the first shaft (13) and the second shaft (14) arranged in parallel to each other In the transmission casing structure coupled with the case cover (54)
The case cover (54) includes a first spherical wall (61) projecting out of the case cover (54) in a dome shape around the axis (L1) of the first shaft (13), and the second shaft. A second spherical wall (66) projecting out of the case cover (54) around the axis (L2) of (14) in a dome shape, a part of the first spherical wall (61), and the second spherical surface A transmission casing structure, comprising: a third spherical wall (71) that overlaps a part of the wall (66) and projects outwardly from the case cover (54) in a dome shape.   The axial end of the third axis (19) arranged in parallel with the first and second axes (13, 14) is opposed to the center of the third spherical wall (71), and the third spherical wall (71) 2. The transmission casing structure according to claim 1, wherein oil is supplied into the third shaft (19) through an oil passage (74) extending from the center of the first shaft.   A dome-shaped fourth spherical wall (68) projecting outward from a central portion of at least one of the first and second spherical walls (61, 66); A bearing support portion (69) for supporting the bearing (70) is formed on the inner surface of the outer peripheral portion, and one of the first and second shafts (13, 14) facing the one spherical wall on the bearing (70). The transmission casing structure according to claim 1 or 2, wherein a shaft end of said shaft is supported.   Oil is supplied into one of the first and second shafts (13, 14) through an oil passage (65) extending from the center of at least one of the first and second spherical walls (61, 66). The transmission casing structure according to any one of claims 1 to 3, wherein the transmission casing structure is provided.   The plurality of reinforcing portions (73) projecting outward and extending radially are formed on at least one of the first and second spherical walls (61, 66). Item 5. The casing structure of the transmission according to any one of Items 4 to 5.   A first rib (76) extending radially outward from the center of at least one of the first and second spherical walls (61, 66), and a first rib extending radially outward from an outer peripheral portion of the one spherical wall. The two ribs (77) are formed so as to project outward from the outer surface of the one spherical wall, and the ridge line of at least one rib (77) of the first and second ribs (76, 77) ( 77a) and the other rib (76) are connected by an overhanging wall (75) projecting outward from the outer surface of said one spherical wall. The casing structure of the transmission according to Item 1.   The mounting portion (78) for fixing the transmission case (52) to a vehicle body is provided between the radially outer ends of the first and second ribs (76, 77). Transmission casing structure.   The said overhanging wall (75) connects the ridgeline (76a) of the said 1st rib (76), and the ridgeline (77a) of the said 2nd rib (77), The Claim 6 or Claim characterized by the above-mentioned. The transmission casing structure according to claim 7.

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