Lubrication structure of power transmission device for vehicle

Abstract

A lubrication structure of a power transmission device for a vehicle, which can effectively lubricate a transfer device or a differential device without increasing the amount of oil. The invention includes a first guide wall (64) located above a bearing (42), a second guide wall (65) provided below an oil reservoir (63) and extending toward a center axis of a final driven gear (44), and an oil blocking member (80) that blocks oil guided by the second guide wall (65) and supplies the oil to the differential device (4) and the bearing (42). The oil blocking member (80) includes a first inclined portion (81) that is inclined so as to be lower in the direction of the first guide wall (64), a cutout portion (83) formed at a position facing an opening portion (41c) formed in a differential case (41), and a groove portion (84) that extends toward the bearing (42) and functions to guide the oil.

Description

TECHNICAL FIELD

[0001] The present application relates to a lubrication structure of a vehicle power transmission device mounted on a four-wheel drive vehicle (4WD vehicle). BACKGROUND

[0002] In a transmission of a vehicle power transmission device that transmits driving force of a driving source such as an engine or an electric motor to wheels, various rotating members such as gears are housed in a case, and as a lubrication method thereof, an oil bath method is sometimes adopted, in which oil stored in a bottom portion of the case is stirred up by rotation of the rotating members, and each portion is lubricated with the stirred-up oil.

[0003] In addition, among vehicles, there is a four-wheel drive vehicle (4WD (4 wheels drive) vehicle) that travels while transmitting driving force of a driving source disposed at a front portion to left and right front wheels and left and right rear wheels, and in the power transmission device of such a four-wheel drive vehicle, a transfer device that transmits driving force from a front differential device to a rear differential device is provided, and the transfer device is connected to the rear differential device via a propeller shaft. Here, the front differential device is a device that distributes and transmits driving force to the left and right front wheels, and the rear differential device is a device that distributes and transmits driving force to the left and right rear wheels.

[0004] Further, in the transmission of such a four-wheel drive vehicle, there is a transmission in which the transfer device is disposed at a position higher than the front differential device (for example, refer to Patent Document 1).

[0005] PRIOR ART DOCUMENTS

[0006] PATENT DOCUMENTS

[0007] Patent Document 1: Japanese Patent No. 6636877 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] Further, in the four-wheel drive vehicle, it is necessary to lubricate the transfer device and the front differential device with oil stirred up by the rotating members housed in the case of the transmission of the power transmission device. In this case, in the power transmission device including the transmission in which the transfer device is disposed at a position higher than the front differential device, the amount of oil is likely to be insufficient, as compared with the transmission of the two-wheel drive vehicle (2WD) and the four-wheel drive vehicle in which the transfer device is disposed at a position lower than the front differential device.

[0010] Therefore, countermeasures for increasing the amount of oil are considered, but if the amount of oil is increased, the pulling loss (stirring resistance) caused by the viscosity of the oil when the rotating member stirs the oil becomes large, which becomes a cause of deterioration of the fuel consumption rate or high weight.

[0011] The present application was achieved in view of the above problems, and has an object to provide a lubrication structure of a vehicle power transmission device that can effectively lubricate a transfer device and a front differential device without increasing the amount of oil.

[0012] Technical means for solving the problem

[0013] To achieve the above object, a lubrication structure of a vehicle power transmission device according to the present application, in which a housing 61, 71 in which oil is stored in a bottom portion, houses: a transmission including a differential device 4, a final driven gear 44 that is installed to a differential housing 41 of the differential device 4 and is rotatably supported by the housing 61 through a bearing 42, and a final drive gear 30 that is engaged with the final driven gear 44; and a transfer device 5 including a transfer input gear 52 that is engaged with the final driven gear 44 at a position higher than the rotational center of the final driven gear 44, the lubrication structure of the vehicle power transmission device is characterized in that: a first guide wall 64 that guides oil stirred by the final drive gear 30 or the transfer input gear 52 to the differential device 4 and the bearing 42 is provided above the bearing 42; an oil storage portion 63 is provided above the transfer input gear 52; and a second guide wall 65 that is provided below the oil storage portion 63 and extends toward the center axis of the final driven gear 44, and the lubrication structure of the vehicle power transmission device includes an oil blocking member 80 that blocks oil guided by the second guide wall 65 and supplies the oil to the differential device 4 and the bearing 42, the oil blocking member 80 includes: a first inclined portion 81 that is inclined so as to be lower in the direction of the first guide wall 64; a cutout portion 83 that is formed at a position facing an opening portion 41c formed in the differential housing 41; and a groove portion 84 that extends toward the bearing 42 and functions as a guide for oil.

[0014] With the lubrication structure of the vehicle power transmission device of the present application, oil stirred up by the final drive pinion or the transfer input gear is guided to the bearings supporting the differential device and the final driven gear by the first guide wall, so the differential device or the bearings are effectively lubricated with the oil. In addition, with the oil retaining member including the structure, oil stirred up by the rotation of the transfer input gear and the final driven gear and flowing into the oil reservoir is guided from the oil reservoir to the differential device and the bearings via the second guide wall and the oil retaining member, so the differential device and the bearings are more effectively lubricated. In particular, oil is supplied to the opening of the differential case via the cutout portion formed in the oil retaining member, so the pinion gear or the side gear in the differential device can be effectively lubricated, and at the same time, oil is supplied to the bearings via the groove portion for guiding the oil, so the bearings can also be effectively lubricated.

[0015] In addition, in the lubrication structure of the vehicle power transmission device, the oil retaining member 80 can be disposed at a position lower than the lower end portion 65a of the second guide wall 65 with a gap Ll between the lower end portion 65a.

[0016] With the structure, the oil retaining member is disposed at a position lower than the lower end portion of the second guide wall, so the oil dripping from the lower end portion of the second guide wall can be more reliably retained by the oil retaining member and supplied to the differential device and the bearings. In addition, by disposing the oil retaining member with a gap between the lower end portion of the second guide wall, oil stirred up by the final drive pinion or the transfer input gear is guided to the oil retaining member or the first guide wall via the gap, so the oil stirred up by the final drive pinion or the transfer input gear can also be effectively used for lubrication.

[0017] In addition, in the lubrication structure of the vehicle power transmission device, the oil retaining member 80 can include an oil receiving portion 81 receiving oil from the second guide wall 65, and a second inclined portion 82 inclined toward the bearings 42 from the oil receiving portion 81, the first inclined portion 81 and the cutout portion 83 being provided to the oil receiving portion 81, and the groove portion 84 being provided to the second inclined portion 82.

[0018] With the structure, oil can be introduced into the opening of the differential case via the first inclined portion and the cutout portion provided to the oil receiving portion of the oil retaining member, so the differential device can be effectively lubricated, and in addition, the bearings supporting the final driven gear can be effectively lubricated with the groove portion provided to the second inclined portion.

[0019] In addition, in the lubrication structure of the vehicle power transmission device, an additional cutout portion 64f can be provided to the first guide wall 64 at a position facing the opening 41c of the differential case 41 in the lower end portion 64a of the first guide wall 64.

[0020] With the structure, oil can be guided to the opening portion of the differential case via the other cutout portion of the first guide wall, so the first guide wall can be used to more effectively lubricate the differential device.

[0021] Effects of the Invention

[0022] With the present application, the following effects can be obtained: the transfer device or the differential device of a vehicle can be effectively lubricated without increasing the amount of oil. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a plan view showing the basic structure of a power transmission system of a four-wheel drive vehicle.

[0024] Figure 2 is a skeletal view showing the basic structure of a power transmission device of a vehicle including the lubricating structure of the present application.

[0025] Figure 3 is a partial side view showing the structure of the joint surface side of the transmission case with the torque converter case.

[0026] Figure 4 is a partial side view showing the structure of the joint surface side of the transmission case with the torque converter case, with various gears removed.

[0027] Figure 5 is a C-C arrow view of Figure 4

[0028] Figure 6 is a perspective view of the first guide wall and its periphery, as viewed from an oblique downward direction.

[0029] Figure 7 is a D arrow view of Figure 4 , and is a side view of the first guide wall, as viewed from the lateral direction.

[0030] Figure 8 is a schematic plan view of the beam plate and its periphery, as viewed from above.

[0031] Figure 9 is a partial side sectional view showing the structure of the joint surface side of the torque converter case with the transmission case.

[0032] Figure 10 is an A-A line sectional view of Figure 9

[0033] Figure 11 is a detailed view of the B portion of Figure 10

[0034] Figure 12 ​​​It is a diagram used to illustrate the flow of oil and is Figure 4 It is formed by recording the flow of oil.

[0035] Figure 13 It is a diagram used to illustrate the flow of oil and is Figure 5 It is formed by recording the flow of oil.

[0036] Figure 14 It is a diagram used to illustrate the flow of oil and is Figure 6 It is formed by recording the flow of oil.

[0037] Figure 15 It is a diagram used to illustrate the flow of oil and is Figure 7 It is formed by recording the flow of oil.

[0038] Figure 16 It is a diagram used to illustrate the flow of oil and is Figure 9 It is formed by recording the flow of oil.

[0039] Explanation of symbols

[0040] 1: Crankshaft

[0041] 3: Transmission

[0042] 4: Front differential device (differential device)

[0043] 5: Transfer case

[0044] 6: Rear differential device

[0045] 9: Drive shaft

[0046] 30: Final driving gear

[0047] 42: Bearings

[0048] 44: Final driven gear

[0049] 52: Transfer case input gear

[0050] 57: Transfer case cover

[0051] 57a: Connecting hole

[0052] 57b: Oil passage (cutout groove)

[0053] 61: Transmission housing

[0054] 61A: Vertical wall

[0055] 61a: Guide

[0056] 63: Second oil storage unit

[0057] 64: First guide wall

[0058] 64a: First rib

[0059] 64b: Second rib

[0060] 64c: lower end

[0061] 64d: lower end

[0062] 64f: incision

[0063] 65: Second guide wall

[0064] 65a: lower end

[0065] 71: Torque converter housing

[0066] 73: First oil storage

[0067] 74: Connecting hole

[0068] 75: Ribs

[0069] 80: Beam and slab

[0070] 81: Oil receiving part

[0071] 82: Inclined part

[0072] 83: Incision

[0073] 84: Groove

[0074] 85: Extension

[0075] 100: Four-wheel drive vehicles

[0076] PT: Power Transmission DETAILED DESCRIPTION

[0077] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0078] [Basic Structure of a Vehicle Power Transmission Device]

[0079] Figure 1 This is a plan view showing the basic structure of the power transmission system of a four-wheel drive vehicle. Figure 2 This is a skeleton diagram showing the basic structure of a vehicle power transmission device including the lubrication structure of the present invention.

[0080] exist Figure 1 In the four-wheel drive vehicle 100 shown, the front ( Figure 1 An engine E as a driving source is arranged on the upper part of the vehicle, and a torque converter 2 and a transmission 3 are connected to the crankshaft 1 as the output shaft of the engine E in sequence. The engine E, the torque converter 2 and the transmission 3 are arranged in the vehicle width direction ( Figure 1They are mounted on the front of the vehicle body in a state of being arranged side by side in the left and right directions.

[0081] Moreover, the power transmission device PT that transmits the driving force of the engine E to the left and right front wheels WFL, WFR and the left and right rear wheels WRL, WRR respectively includes: a torque converter 2, a transmission 3 connected to the torque converter 2, a front differential device 4 connected to the transmission 3, a transfer device 5 connected to the front differential device 4, and a rear differential device 6 connected to the transfer device 5.

[0082] The front differential device 4 is connected to the left and right front wheels WFL and WFR via the left and right front axles 7L and 7R, and the rear differential device 6 is connected to the left and right rear wheels WRL and WRR via the left and right rear axles 8L and 8R. Figure 1 The transmission shaft 9 is arranged in the up and down direction in the middle and is connected to the transfer case device 5.

[0083] In addition, if Figure 2 As shown, in the transmission 3, a main shaft MS, a countershaft SS, and an intermediate shaft CS extending in the vehicle width direction are rotatably arranged parallel to each other. Furthermore, a main drive gear 21 is fixed to the main shaft MS. Furthermore, a main third-speed gear 22, which is connectable to the main shaft MS via a third-speed clutch C3, a main fourth-speed gear 23, which is connectable to the main shaft MS via a fourth-speed / reverse clutch C4R, and a main reverse gear 24 are supported for relative rotation.

[0084] A counter driven gear 25 is fixed to the counter shaft SS, and a counter first speed gear 26 connectable to the counter shaft SS via a first speed clutch C1 and a counter second speed gear 27 connectable to the counter shaft SS via a second speed clutch C2 are supported so as to be relatively rotatable.

[0085] Furthermore, a second-speed intermediate gear 28, a third-speed intermediate gear 29, and a final drive gear 30 are fixed to the intermediate shaft CS. Furthermore, an idler intermediate gear 31, a fourth-speed intermediate gear 32, and an intermediate reverse gear 33 are supported so as to be relatively rotatable. Furthermore, a first-speed intermediate gear 34 is supported so as to be relatively rotatable on the intermediate shaft CS, and is coupled to the intermediate shaft CS via a first-speed holding clutch CLH.

[0086] Here, the reverse idler gear 35 meshes with the main reverse gear 24 and the intermediate reverse gear 33. Furthermore, the intermediate first-speed gear 34 can be connected to the intermediate third-speed gear 29 via a one-way clutch COW, and the intermediate fourth-speed gear 32 and the intermediate reverse gear 33 can be selectively connected to the countershaft CS via a selector 36.

[0087] Further, the main drive gear 21 is engaged with the intermediate idler gear 31, and the intermediate idler gear 31 is engaged with the sub driven gear 25. Therefore, the rotation of the crankshaft 1 of the engine E is transmitted to the sub shaft SS via the torque converter 2, the main shaft MS, the main drive gear 21, the intermediate idler gear 31, and the sub driven gear 25.

[0088] Further, when the sub first speed gear 26 that is rotatably supported with respect to the sub shaft SS is linked with the sub shaft SS by the first speed clutch Cl, the rotation of the sub shaft SS is transmitted to the countershaft CS via the first speed clutch Cl, the sub first speed gear 26, the one-way clutch COW, and the intermediate third speed gear 29, thereby establishing the first speed gear position. Further, the first speed clutch Cl also maintains the engaged state at the establishment of the second to fourth speed gear positions, but the one-way clutch COW slips at the establishment of the second to fourth speed gear positions.

[0089] Further, when the sub second speed gear 27 that is rotatably supported with respect to the sub shaft SS is linked with the sub shaft SS by the second speed clutch C2, the rotation of the sub shaft SS is transmitted to the countershaft CS via the second speed clutch C2, the sub second speed gear 27, and the intermediate second speed gear 28, thereby establishing the second speed gear position.

[0090] Further, when the main third speed gear 22 that is rotatably supported with respect to the main shaft MS is linked with the main shaft MS by the third speed clutch C3, the rotation of the main shaft MS is transmitted to the countershaft CS via the third speed clutch C3, the main third speed gear 22, and the intermediate third speed gear 29, thereby establishing the third speed gear position.

[0091] Further, when the main fourth speed gear 23 that is rotatably supported with respect to the main shaft MS is linked with the main shaft MS by the fourth-speed-reverse clutch C4R in a state where the intermediate fourth speed gear 32 that is rotatably supported with respect to the countershaft CS is linked with the countershaft CS by the selector 36, the rotation of the main shaft MS is transmitted to the countershaft CS via the fourth-speed-reverse clutch C4R, the main reverse gear 24, the reverse idler gear 35, the intermediate reverse gear 33, and the selector 36, thereby establishing the fourth speed gear position.

[0092] Further, when the main reverse gear 24 that is rotatably supported with respect to the main shaft MS is linked with the main shaft MS by the fourth-speed-reverse clutch C4R in a state where the intermediate reverse gear 33 that is rotatably supported with respect to the countershaft CS is linked with the countershaft CS by the selector 36, the rotation of the main shaft MS is transmitted to the countershaft CS via the fourth-speed-reverse clutch C4R, the main reverse gear 24, the reverse idler gear 35, the intermediate reverse gear 33, and the selector 36, thereby establishing the reverse gear position.

[0093] Furthermore, when the first-speed holding clutch CLH is engaged while the first-speed clutch C1 is engaged, a first-speed holding gear is established. If the first-speed holding gear is established when strong engine braking is required, even if the one-way clutch COW slips, the torque of the rear wheels WRL and WRR can be reversely transmitted to the engine E through the first-speed holding clutch CLH.

[0094] Next, the structure of the front differential device 4 will be described.

[0095] like Figure 2 As shown, the front differential device 4 includes a transmission case (see FIG. Figure 3 ) 61, and a large-diameter final driven gear 44 is fixed to the outer periphery of the differential case 41. Here, the final driven gear 44 meshes with the final driving gear 30 fixed to the intermediate shaft CS. Since the structures of the front differential device 4 and the rear differential device 6 are already known, their detailed description will be omitted.

[0096] Moreover, in the transmission 3, the rotation of the intermediate shaft CS is transmitted to the differential case 41 through the final drive gear 30 and the final driven gear 44. The rotation of the differential case 41 is transmitted to the left and right front axles 7L and 7R corresponding to the load of the left and right front wheels WFL and WFR, thereby driving the left and right front wheels WFL and WFR in rotation.

[0097] Next, the structure of the transfer device 5 will be described.

[0098] In the transfer device 5, a transfer input gear 52 and a first bevel gear 53 are formed at both axial ends of a transfer input shaft 51 that is rotatable along the vehicle width direction. The transfer input gear 52 meshes with the final driven gear 44 of the front differential device 4. In addition, the first bevel gear 53 meshes with a second bevel gear 55 fixed to one axial end (front end) of a transfer output shaft 54 ​​that is rotatable and arranged in the vehicle front-rear direction. Moreover, the other end (rear end) of the transfer output shaft 54 ​​is connected to the front differential through a joint (not shown). Figure 1 The transmission shaft 9 shown is connected.

[0099] Therefore, the rotation transmitted from the engine E to the final driven gear 44 of the front differential device 4 passes through the transfer input gear 52, the transfer input shaft 51, the first bevel gear 53, the second bevel gear 55, the transfer output shaft 54 ​​and the propeller shaft 9 to the front differential device 4. Figure 1 The power is transmitted to the rear differential device 6 shown in the figure, and is distributed in the rear differential device 6 and transmitted to the left and right rear axles 8L and 8R, so that the left and right rear wheels WRL and WRR are rotationally driven. Figure 1The illustrated four-wheel drive vehicle 100 travels by the rotation of left and right front wheels WFL, WFR and left and right rear wheels WRL, WRR.

[0100] [Lubrication structure of power transmission device]

[0101] Next, the lubrication structure of the power transmission device of the present invention will be described.

[0102] Figure 3 This is a partial side view showing the structure of the transmission case on the side of the joint surface with the torque converter case. Figure 4 This is a partial side view showing the structure of the transmission case and the torque converter case, with various gears removed. Figure 5 yes Figure 4 CC arrow cross-section diagram.

[0103] Containment Figure 2 The housing of the transmission 3, the front differential device (hereinafter referred to as "differential device") 4 and the transfer case 5 is Figure 3 The transmission housing 61 and the torque converter housing 71 (see Figure 9 ) are joined and the two are integrated by using multiple bolts not shown in the figure.

[0104] like Figure 3 As shown, the transmission case 61, on the interface with the torque converter case 71, is equipped with a large-diameter final driven gear 44, along with a small-diameter final drive gear 30 and a transfer input gear 52, which mesh with the final driven gear 44. Lubricating oil is stored at the bottoms of the transmission case 61 and the torque converter case 71, and a portion of the final driven gear 44 is immersed in this oil. The transfer input gear 52 meshes with the final driven gear 44 above the rotation center P when the vehicle is fully loaded on a flat road.

[0105] In addition, if Figure 5As shown, the differential case 41 has a pair of cylindrical inboard portions (boss portions) 41a extending in the left-right direction of the vehicle body. The outer peripheral surface of the inboard portions 41a is supported by the inner race of a bearing 42. The bearing 42 is a tapered roller bearing including rollers that are arranged obliquely to the axial direction of the inboard portions 41a. In addition, a pinion shaft 43 is supported inside the differential case 41. The pinion shaft 43 is fixed to the differential case 41 so as to be non-rotatable and non-removable. A pinion gear (differential pinion gear) that is not shown is rotatably supported on the pinion shaft 43. In addition, a side gear (drive pinion) 45 that meshes with the pinion gear is spline-coupled to an axle (not shown). Furthermore, an opening portion (differential opening portion) 41c is formed in the upper portion of the differential case 41, and the pinion shaft 43 or the side gear 45 and other constituent parts inside the differential case 41 are arranged on the lower side of the opening portion 41c (inside the opening portion 41c).

[0106] In addition, as shown in Figure 4 , a first guide wall 64 is formed above the bearing 42 inside the transmission case 61. Figure 6 and Figure 7 are views that show the detailed structure of the first guide wall, Figure 6 is a perspective view that shows the first guide wall and its surroundings as viewed from an oblique lower direction, Figure 7 is a D-arrow view of Figure 4 , and is a side view that shows the first guide wall as viewed from the lateral direction. The first guide wall 64 is positioned above the bearing 42, functions to guide oil stirred up by the transfer input gear 52 or oil scattered due to the rotation of the final drive pinion 30 to the bearing 42, and is configured to have a first rib 64a that extends in the substantially vertical direction and extends toward the axial center of the final driven gear 44, and a second rib 64b that is arranged on the side of the first rib 64a (right side of Figure 4 ), is substantially V-shaped in the lateral direction, and has a portion on the lower end side thereof extending toward the axial center of the final driven gear 44. Here, a gap L2 is provided between the first rib 64a and the second rib 64b, and oil flowing along the surface (upper surface) of the first rib 64a is guided to the differential device 4 and the bearing 42 through the gap L2.

[0107] As shown in Figure 6 and Figure 7As shown, a notch 64f is provided at the lower end 64c of the first rib 64a, directly above (facing) the opening 41c of the differential case 41. This notch 64f is formed by cutting the lower end 64c of the first rib 64a into a substantially U-shape. This notch 64f corresponds to the "other notch" of the present invention. The notch 64f is formed at a position corresponding to the lower end 64c of the first rib 64a and below (approximately directly below) the lower end 64d of the second rib 64b.

[0108] In addition, if Figure 4 As shown, a boss-shaped guide portion (mounting seat) 61a for mounting components of a parking mechanism (not shown) is integrally formed on the upper portion of the vertical wall 61A of the transmission case 61 (above the bearing 42 supporting the final driven gear 44).

[0109] In addition, if Figure 4 and the following Figure 9 As shown, a first oil reservoir 73 is provided above the transfer input gear 52 in the torque converter housing 71. The first oil reservoir 73 is formed by a substantially arc-shaped rib 75 (see FIG. Figure 9 ), separating the first and second oil reservoirs 73 from the transfer input gear 52. Furthermore, a second oil reservoir 63 is provided in the transmission case 61. The second oil reservoir 63 is separated from the transfer input gear 52 by a second, substantially arc-shaped guide wall 65 extending along a portion of the upper side of the transfer input gear 52. The first and second oil reservoirs 73, 63 are provided between an axial side surface of the transmission case 61 and a side surface of the torque converter case 71.

[0110] like Figure 4 As shown, a garter plate (oil blocking member) 80 is provided. The garter plate 80 is used to block the oil guided by the second guide wall 65 and supply the oil to the differential device 4 and the bearing 42 . Figure 8 This is a schematic plan view of the beam plate 80 and its surroundings viewed from above. Figure 4 、 Figure 5 、 Figure 8 As shown, the beam plate 80 includes: an oil receiving portion 81 for receiving oil from the second guide wall 65 ; and an inclined portion (second inclined portion) 82 inclined from the oil receiving portion 81 toward the bearing 42 .

[0111] like Figure 4The oil receiving portion 81 is a sloped planar portion (first sloped portion) that is sloped so as to be lower from the second guide wall 65 side toward the first guide wall 64 side in the direction of the first guide wall 64, as shown. On the other hand, as shown in Figs. 6 and 7, the oil receiving portion 81 is not sloped from the second guide wall 65 side toward the bearing 42 side (from the paper front side toward the paper back side), and is a non-sloped surface that is not sloped in the direction of the bearing 42. Figure 5 Figure 4 The oil receiving portion 81 is a sloped planar portion (first sloped portion) that is sloped so as to be lower from the second guide wall 65 side toward the first guide wall 64 side in the direction of the first guide wall 64, as shown. On the other hand, as shown in Figs. 6 and 7, the oil receiving portion 81 is not sloped from the second guide wall 65 side toward the bearing 42 side (from the paper front side toward the paper back side), and is a non-sloped surface that is not sloped in the direction of the bearing 42.

[0112] In addition, as shown in Figs. 6 and 7, a notch portion 83 is formed in the bottom wall of the end portion (lower end portion) of the first guide wall 64 side of the oil receiving portion 81. The notch portion 83 is formed in a position directly above the opening portion 41c (a position facing the opening portion 41c) of the differential case 41, so that oil blocked by the oil receiving portion 81 of the beam plate 80 drips from the notch portion 83 to the opening portion 41c in the position directly below. Figure 5 Figure 8 In addition, as shown in Figs. 6 and 7, a notch portion 83 is formed in the bottom wall of the end portion (lower end portion) of the first guide wall 64 side of the oil receiving portion 81. The notch portion 83 is formed in a position directly above the opening portion 41c (a position facing the opening portion 41c) of the differential case 41, so that oil blocked by the oil receiving portion 81 of the beam plate 80 drips from the notch portion 83 to the opening portion 41c in the position directly below.

[0113] In addition, as shown in Figs. 6 and 7, a notch portion 83 is formed in the bottom wall of the end portion (lower end portion) of the first guide wall 64 side of the oil receiving portion 81. The notch portion 83 is formed in a position directly above the opening portion 41c (a position facing the opening portion 41c) of the differential case 41, so that oil blocked by the oil receiving portion 81 of the beam plate 80 drips from the notch portion 83 to the opening portion 41c in the position directly below. Figure 5 Figure 8 The sloped portion 82 of the beam plate 80 is a sloped planar portion that is sloped so as to be gradually lower from the oil receiving portion 81 toward the upper portion of the bearing 42, and a groove portion 84 is formed in the substantially center in the width direction (left-right direction) of the sloped portion 82, the length direction of the groove portion 84 extending from the oil receiving portion 81 toward the bearing 42, and serving as a guide for oil. The groove portion 84 is a flow path in the shape of a flow channel that is concave in cross section so as to be lower than the surface of the sloped portion 82. In addition, the end portion of the sloped portion 82 on the bearing 42 side (the upper end portion) is curved downward, and the front end thereof is an extension portion 85 that extends in the direction directly below toward the upper end of the bearing 42. The extension portion 85 functions as a discharge plate that discharges oil blocked by the beam plate 80 from the axial gap between the longitudinal wall 61A of the transmission case 61 toward the bearing 42. Moreover, the groove portion 84 is continuously formed from the sloped portion 82 of the beam plate 80 to the extension portion 85. Furthermore, the groove portion 84 has the effect of ensuring the strength required for the beam plate 80, in addition to the effect of appropriately guiding oil blocked by the beam plate 80 to the downstream side, as will be described later. In addition, a peripheral wall is provided standing up around the outer periphery of the oil receiving portion 81 and the sloped portion 82 of the beam plate 80, and the oil that flows through the sloped portion 82 blocked by the oil receiving portion 81 is prevented from spilling by the peripheral wall. Figure 4 Figure 8 In addition, as shown in Figs. 6 and 7, a notch portion 83 is formed in the bottom wall of the end portion (lower end portion) of the first guide wall 64 side of the oil receiving portion 81. The notch portion 83 is formed in a position directly above the opening portion 41c (a position facing the opening portion 41c) of the differential case 41, so that oil blocked by the oil receiving portion 81 of the beam plate 80 drips from the notch portion 83 to the opening portion 41c in the position directly below.

[0114] In addition, as shown in Figs. 6 and 7, a notch portion 83 is formed in the bottom wall of the end portion (lower end portion) of the first guide wall 64 side of the oil receiving portion 81. The notch portion 83 is formed in a position directly above the opening portion 41c (a position facing the opening portion 41c) of the differential case 41, so that oil blocked by the oil receiving portion 81 of the beam plate 80 drips from the notch portion 83 to the opening portion 41c in the position directly below. Figure 4 ​​​​As shown, the beam plate 80 is arranged at a position lower than the lower end portion 65a of the second guide wall 65 with a gap Ll between the lower end portion 65a. That is, the oil receiving portion 81 of the beam plate 80 is arranged diagonally below (lower right of) the lower end portion 65a of the second guide wall 65 with the gap Ll from the lower end portion 65a of the second guide wall 65. Figure 4 Thus, oil dripping from the lower end portion 65a of the second guide wall 65 is caught by the oil receiving portion 81 of the beam plate 80.

[0115] The beam plate 80 of the structure functions to receive oil stirred up by the final driven gear 44, the final drive gear 30, and the transfer input gear 52 and flowing into the first oil reservoir 73, and guide the oil to the differential device 4 (the opening portion 41c of the differential case 41) and the bearing 42.

[0116] Figure 9 is a partial side sectional view showing the structure of the torque converter case on the side of the joint surface with the transmission case. In addition, Figure 10 is an A-A line sectional view of Figure 9 , Figure 11 is a B portion enlarged detailed view of Figure 10 . As shown, Figure 9 the first oil reservoir 73 formed above the transfer input gear 52 communicates with the space S shown in Figure 10 via the communication hole 74 formed in the torque converter case 71.

[0117] Here, as shown in Figure 10 in the transfer device 5, the first bevel gear 53, the second bevel gear 55, and the like, which mesh with each other, are housed inside the transfer case 56 and the transfer cover 57 mounted on the transfer case 56. In addition, the transfer input shaft 51 on which the first bevel gear 53 is formed and the transfer output shaft 54 on which the second bevel gear 55 is formed are rotatably supported by the transfer cover 57 and the transfer case 56 via the bearing 58 and the bearing 59, and the space S is formed between the torque converter case 71 and the transfer cover 57.

[0118] Further, as shown in Figure 11 a communication hole 57a that communicates the space S with the inside of the transfer cover 57 is formed in the side portion of the transfer cover 57. In addition, an oil passage (cutout groove) 57b that is bent in an L shape is formed in a portion of the transfer cover 57 that supports the bearing 58 below one of Figure 11 the inside of the transfer cover 57 and the inside of the transmission case 61 communicate with each other via the oil passage 57b. In addition, as shown in Figure 9As shown, the outflow end (outlet) of the oil passage 57 b is arranged in a position facing (facing) the meshing portion between the final driven gear 44 and the transfer input gear 52 in the torque converter case 71 .

[0119] Next, the flow of oil in the lubrication structure configured as described above will be described. Figures 12-16 is a diagram for explaining the flow of oil, and is respectively Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 9 The oil flow is indicated in the figure. In each figure, the oil flow is represented by a thick single-dot chain line. The lubrication structure constructed as described above can efficiently supply oil flowing according to the following three patterns [1] to [3] to the differential device 4 and bearings 42.

[0120] [1] The oil stirred up by the final driven gear 44 is guided and supplied to the differential device 4 and the bearing 42 by the beam plate 80 .

[0121] [2] The oil stirred up by the transfer input gear 52 and directed to the first oil reservoir 73 is supplied to the differential device 4 and the bearing 42 by the beam plate 80 .

[0122] [3] The oil scattered by the rotation of gears other than the final driven gear 44 (such as the final drive gear 30 ) is supplied to the differential device 4 (the opening 41 c of the differential case 41 ) by utilizing the inner surfaces (inner walls) of the transmission case 61 and the torque converter case 71 and the first guide wall 64 .

[0123] The flow of oil in each mode will be described in detail below.

[0124] In mode [1], the final driven gear 44 is rotated along Figure 12 The oil is stirred up as shown by the arrow a, but the oil flows from the gap L1 between the lower end 65a of the second guide wall 65 and the beam plate 80 into the space S1 above the beam plate 80. The oil is received by the oil receiving portion 81 of the beam plate 80. Figure 13 As shown, a portion of the oil received by the oil receiving portion 81 drips from the cutout portion 83 of the oil receiving portion 81 into the opening 41 c of the differential case 41, and is used to lubricate the pinion shaft 43 and the pinion gears or side gears 45 within the opening 41 c. Furthermore, the remaining portion of the oil received by the oil receiving portion 81 flows from the oil receiving portion 81 into the inclined portion 82, along the groove 84, from the inclined portion 82 to the extension portion 85, and drips from the lower end of the extension portion 85 to be supplied to the bearing 42, thereby lubricating the bearing 42.

[0125] In mode 〔2〕, if Figure 16As shown by arrow b1, it is meshed with the final driven gear 44 and moves along this Figure 16 The oil stirred up by the transfer case input gear 52 rotating in the direction of the arrow (clockwise) flows into the first oil reservoir 73. The oil flowing into the first oil reservoir 73 flows from the first oil reservoir 73 facing each other to the second oil reservoir 63. Figure 12 As shown by arrow b2, the oil flowing into the second oil reservoir 63 flows down along the upper surface of the second guide wall 65, drips from the lower end 65a of the second guide wall 65 to the oil receiving portion 81 of the beam plate 80, and is received by the oil receiving portion 81. The oil received by the oil receiving portion 81 is then the same as in mode [1], as shown in FIG. Figure 13 As shown, a portion of the oil drips from the cutout portion 83 of the oil receiving portion 81 to the opening 41 c of the differential case 41, and is used to lubricate the pinion shaft 43 and the pinion gears or side gears 45 within the opening 41 c. Furthermore, the remaining portion of the oil received by the oil receiving portion 81 flows from the oil receiving portion 81 into the inclined portion 82, flows from the inclined portion 82 along the groove 84 to the extension portion 85, and drips from the lower end of the extension portion 85 to be supplied to the bearing 42, thereby lubricating the bearing 42.

[0126] In addition, a portion of the oil in the first oil reservoir 73 is discharged from the communicating hole 74 (see Figure 16 )Towards Figure 10 The space S shown (the space between the torque converter housing 71 and the transfer cover 57) flows into the Figure 11 As shown in detail, the oil flowing into the space S flows into the transfer cover 57 through the communication hole 57a formed in the transfer cover 57, lubricates various parts, and then flows into the transmission case 61 through the L-shaped oil passage 57b formed in the transfer cover 57. At this time, the outflow end of the oil passage 57b is arranged at a position facing the meshing portion between the final driven gear 44 and the transfer input gear 52. Therefore, the oil flowing out of the oil passage 57b (return oil from the transfer device 5) is stirred by the rotation of the final driven gear 44 and the transfer input gear 52, and is then rotated as shown in FIG. Figure 16 The oil flows back into the first oil reservoir 73 as indicated by the arrow b1. In the present embodiment, the outflow end of the oil passage 57b is shown as being arranged at a position facing the meshing portion between the final driven gear 44 and the transfer input gear 52. However, although not shown in the figure, the outflow end of the oil passage 57b may also be arranged above the position facing the meshing portion between the final driven gear 44 and the transfer input gear 52.

[0127] In mode [3], due to the rotation of the final driving gear 30 meshing with the final driven gear 44, the oil Figure 12and falls down as shown by an arrow c1. The oil hits the upper inner peripheral surface of the transmission case 61 or the guide portion 61a and falls down as shown by an arrow c2. Figure 12 The oil flows into the space S2 above the first guide wall 64 as shown by an arrow c2, and is caught by the first rib 64a of the first guide wall 64. The oil caught by the first rib 64a flows down through the gap L2 between the first rib 64a and the second rib 64b by flowing along the surface of the first rib 64a as shown by an arrow c3. Figure 14 and Figure 15 The oil flowing along the surface of the first rib 64a drips from the notch portion 64f of the lower end portion 64c of the first rib 64a into the opening portion 41c directly below the first rib 64a and is supplied to the pinion shaft 43 and the pinion or side gear 45 and the like in the opening portion 41c.

[0128] As described above, in the lubrication structure of the present embodiment, the first guide wall 64 is provided above the bearing 42 to guide the oil stirred up by the final drive gear 30 or the transfer input gear 52 to the differential device 4 and the bearing 42, the second oil reservoir (oil reservoir) 63 is provided above the transfer input gear 52, and the second guide wall 65 is provided below the second oil reservoir 63 and extends toward the center axis of the final driven gear 44, and the lubrication structure includes the beam plate (oil blocking member) 80 that blocks the oil guided by the second guide wall 65 and supplies the oil to the differential device 4 and the bearing 42. In addition, the beam plate 80 includes the oil catching portion 81 as the first inclined portion that is inclined so as to be lower in the direction of the first guide wall 64, the cutout portion 83 that is formed at a position facing the opening portion (differential opening portion) 41c formed in the differential case 41, and the groove portion 84 that extends toward the bearing 42 and is used for the guidance of the oil.

[0129] With the lubrication structure of the present embodiment, the oil stirred up by the final drive gear 30 or the transfer input gear 52 is guided to the bearing 42 that supports the differential device 4 and the final driven gear 44 by the first guide wall 64, so the lubrication of the differential device 4 or the bearing 42 is effectively performed with the oil. In addition to this, with the beam plate (oil blocking member) 80 including the structure, the oil stirred up by the rotation of the transfer input gear 52 and flowing into the second oil reservoir (oil reservoir) 63 is guided from the second oil reservoir 63 to the differential device 4 and the bearing 42 via the second guide wall 65 and the beam plate 80, so the differential device 4 and the bearing 42 are more effectively lubricated. In particular, the oil is supplied to the opening portion 41c of the differential case 41 via the cutout portion 83 formed in the beam plate 80, so the pinion shaft 43 or the side gear 45 and the like in the differential device 4 can be effectively lubricated, and the oil is supplied to the bearing 42 via the groove portion 84 used for the guidance of the oil, so the bearing 42 can also be effectively lubricated.

[0130] Therefore, the oil stirred up by the final driven gear 44, the final drive gear 30, and the transfer input gear 52 is collected to the second oil reservoir 63, and supplied from the second oil reservoir 63 to the bearing 42 of the final driven gear 44 to lubricate the bearing 42, and a part of the oil is also supplied to the differential device 4 to lubricate the differential device 4, so that the following effects can be obtained: the bearing 42 of the power transmission device PT or the differential device 4 can be effectively lubricated without increasing the amount of oil.

[0131] In addition, in the lubrication structure of the present embodiment, the beam plate 80 is disposed at a position lower than the lower end portion 65a of the second guide wall 65 with a gap Ll between the lower end portion 65a.

[0132] With the structure, the beam plate 80 is located at a position lower than the lower end portion 65a of the second guide wall 65, so that the oil dripping from the lower end portion 65a of the second guide wall 65 can be more reliably blocked by the beam plate 80 and supplied to the differential device 4 and the bearing 42. In addition, by disposing the beam plate 80 with the gap Ll between the lower end portion 65a of the second guide wall 65, the oil stirred up by the final driven gear 44 or the transfer input gear 52 is blocked by the beam plate 80 through the gap Ll, so that the oil stirred up by the final driven gear 44 or the transfer input gear 52 can also be effectively used for lubrication.

[0133] In addition, in the lubrication structure of the present embodiment, the beam plate 80 includes an oil receiving portion 81 that blocks the oil from the second guide wall 65, and an inclined portion (second inclined portion) 82 that is inclined toward the bearing 42 from the oil receiving portion 81, the first inclined portion and the notch portion 83 of the present embodiment are provided to the oil receiving portion 81, and the groove portion 84 is provided to the inclined portion 82.

[0134] With the structure, the oil can be introduced to the opening portion 41c of the differential case 41 through the first inclined portion and the notch portion 83 of the beam plate 80 provided to the oil receiving portion 81, so that the differential device 4 can be effectively lubricated, and the bearing 42 that supports the final driven gear 44 can be effectively lubricated through the groove portion 84 provided to the inclined portion 82.

[0135] In addition, in the lubrication structure of the present embodiment, a notch portion (the "other notch portion" of the present embodiment) 64f is provided to the first guide wall 64 (the first rib 64a) at a position facing the opening portion 41c of the differential case 41 in the lower end portion 64c.

[0136] With the structure, the oil can be introduced to the opening portion 41c of the differential case 41 through the notch portion 64f of the first guide wall 64, so that the differential device 4 can be more effectively lubricated by the first guide wall 64.

[0137] Furthermore, the application of the present application is not limited to the embodiments described above, and various modifications can be made within the scope of the technical idea recited in the claims and the specification and drawings.

Claims

1. A lubricating structure for a vehicle power transmission device, comprising: a housing having oil stored at the bottom thereof; A transmission including a differential device, a final driven gear, and a final driving gear, wherein the final driven gear is mounted on a differential case of the differential device and rotatably supported by the case via a bearing, and the final driving gear is meshed with the final driven gear; as well as a transfer case device comprising a transfer case input gear meshing with the final driven gear, The transfer case input gear meshes with the final driven gear at a position above the rotation center of the final driven gear, and the lubrication structure of the vehicle power transmission device is characterized in that: The housing is provided with: a first guide wall, located above the bearing, guiding the oil stirred up by the final driving gear or the transfer case input gear to the differential device and the bearing; an oil storage portion, disposed above the transfer case input gear; as well as A second guide wall is provided below the oil storage portion and extends toward the central axis of the final driven gear, and The lubrication structure of the vehicle power transmission device includes an oil baffle member that receives the oil guided by the second guide wall and supplies the oil to the differential device and the bearing. The oil baffle member includes a first inclined portion inclined so as to become lower in the direction of the first guide wall; a cutout portion formed at a position facing the opening formed in the differential case; and a groove portion extending toward the bearing and used for guiding oil.

2. The lubrication structure of a vehicle power transmission device according to claim 1, wherein: The oil-blocking member is disposed at a position lower than the lower end portion of the second guide wall with a gap therebetween.

3. The lubrication structure of a vehicle power transmission device according to claim 1 or 2, characterized in that: The oil blocking member includes: an oil receiving portion for blocking the oil from the second guide wall; and a second inclined portion inclined from the oil receiving portion toward the bearing. The first inclined portion and the cutout portion are provided on the oil receiving portion. The groove is provided on the second inclined portion.

4. The lubrication structure of a vehicle power transmission device according to claim 1 or 2, characterized in that: Another cutout is provided at a position of the lower end portion of the first guide wall facing the opening.

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