Vehicle Transmission

Abstract

To provide a vehicular transmission which can supply an oil to a first side wall side oil supplied part and a second side wall side oil supplied part to lubricate a lubrication portion and thereby improve lubrication performance.SOLUTION: In a transmission 1, an oil introduction part 41 of an oil gutter 40 is open toward a final driven gear 12. A first oil passage part 42 extends from the oil introduction part 41 to a left wall 4B along an axial direction of an input shaft 7. Further, a second oil passage part 43 is branched from the first oil passage part 42 and extends along a partition wall 5W. The first oil passage part 42 has an oil supply port 42a which is open toward the left wall 4B and supplies the oil to bearing support parts 4b, 4c. The second oil passage part 43 has a front oil supply port 43a and a rear oil supply port 43b which are open toward the partition wall 5W and supply the oil to bearing support parts 5b, 5d.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a vehicle transmission.

Background Art

[0002] Conventionally, in a vehicle transmission mounted on a vehicle, there is known one that scrapes up oil by gears to lubricate lubricating parts (see Patent Document 1).

[0003] In the vehicle transmission described in Patent Document 1, one end portions of the input shaft and the counter shaft are rotatably supported on the side of the partition wall facing the engine, and the other end portions of the input shaft and the counter shaft are installed on the side wall side facing the partition wall.

[0004] A differential device having a final drive gear is installed on the rear side of the input shaft and the counter shaft, and an oil gutter for capturing the oil scraped up by the final drive gear is installed above the input shaft and the counter shaft.

[0005] The oil gutter includes an oil introduction portion, an oil passage portion, and an oil discharge portion. The oil introduction portion opens toward the final drive gear along the wall surface of the partition wall.

[0006] The oil passage portion extends from the oil introduction portion toward the side wall above a plurality of counter shafts, and the oil discharge portion supplies the oil guided to the oil passage portion to the side wall side counter bearing portion.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in a conventional vehicle transmission, the oil discharge part of the oil gutter supplies oil only to the side wall side (side wall side counter bearing part) and does not supply oil to the partition wall side. Therefore, there is still room for improvement in order to improve the lubrication performance of the lubrication parts on the partition wall side.

[0009] The present invention has been made paying attention to the above circumstances, and an object thereof is to provide a vehicle transmission that can supply oil to a first oil supply part on the side wall side and a second oil supply part on the side wall side to lubricate lubrication parts and improve lubrication performance.

Means for Solving the Problems

[0010] The present invention has a plurality of rotating shafts installed in parallel, and gear members provided on the plurality of rotating shafts respectively and meshing with each other, and a transmission mechanism that changes the rotation of an internal combustion engine and outputs the changed rotation, and a final driven gear to which power is transmitted from the transmission mechanism, and a differential device that transmits power to left and right drive wheels, and a first side wall that rotatably supports one end side of the plurality of rotating shafts, and a second side wall that rotatably supports the other end side of the plurality of rotating shafts, and a transmission case that houses the transmission mechanism and the differential device, and an oil gutter that is housed in the transmission case and captures oil scraped up by the final driven gear and guides the oil to an oil supply portion, and the final driven gear is installed so as to be biased toward the first side wall with respect to the second side wall in the axial direction of the plurality of rotating shafts. The vehicle transmission is characterized in that the oil supply portion includes a first side wall side oil supply portion provided on the first side wall and a second side wall side oil supply portion provided on the second side wall, and the oil gutter has an oil introduction portion, a first oil passage portion, and a second oil passage portion. The oil introduction portion opens toward the final driven gear, the first oil passage portion extends from the oil introduction portion along the axial direction of the plurality of rotating shafts to the second side wall, the second oil passage portion branches from the first oil passage portion and extends along the wall surface of the first side wall, the first oil passage portion opens toward the second side wall and has a second side wall side oil supply portion that supplies oil to the second side wall side oil supply portion, and the second oil passage portion opens toward the first side wall and has a first side wall side oil supply portion that supplies oil to the first side wall side oil supply portion. Further, the first side wall is located below the first side wall side oil supply portion, and has a guide portion protruding from the first side wall toward the second side wall. The first side wall side oil supply portion is located below the guide portion and has a front side oil supply portion located on the front side in the vehicle longitudinal direction than the rear portion of the guide portion. The guide portion guides the oil discharged from the first side wall side oil supply portion to the front side oil supply portion. The guide portion has an upper surface portion facing the first side wall side oil supply portion in the vertical direction and a vertical surface portion extending downward from the front end portion of the upper surface portion. The first side wall side oil supply portion faces the wall surface portion of the first side wall above the upper surface portion in the axial direction of the plurality of rotating shafts. The upper surface portion extends in the axial direction of the plurality of rotating shafts from the rear side to the front side in the vehicle longitudinal direction. The front side oil supply portion is provided below the vertical surface portion. It is characterized by the above.

Effect of the Invention

[0011] According to the present invention as described above, it is possible to supply oil to the oil supply portion on the first side wall side and the oil supply portion on the second side wall side to lubricate the lubrication portion, and the lubrication performance of the vehicle transmission can be improved.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

MODE FOR CARRYING OUT THE INVENTION

[0013] A transmission for a vehicle according to an embodiment of the present invention includes a plurality of rotating shafts installed in parallel, and gear members provided on the plurality of rotating shafts respectively and meshing with each other, and a transmission mechanism that changes the rotation of an internal combustion engine and outputs it, and a final driven gear to which power is transmitted from the transmission mechanism, and a differential device that transmits power to left and right drive wheels, and a first side wall that rotatably supports one end side of the plurality of rotating shafts, and a second side wall that rotatably supports the other end side of the plurality of rotating shafts, and a transmission case that houses the transmission mechanism and the differential device, and an oil gutter that is housed in the transmission case and captures oil scraped up by the final driven gear and guides it to an oil supply portion. The final driven gear is installed offset toward the first side wall with respect to the second side wall in the axial direction of the plurality of rotating shafts. The oil supply portion is configured to include a first side wall side oil supply portion provided on the first side wall and a second side wall side oil supply portion provided on the second side wall. The oil gutter has an oil introduction portion, a first oil passage portion, and a second oil passage portion. The oil introduction portion opens toward the final driven gear. The first oil passage portion extends from the oil introduction portion along the axial direction of the plurality of rotating shafts to the second side wall. The second oil passage portion branches from the first oil passage portion and extends along the wall surface of the first side wall. The first oil passage portion has a second side wall side oil supply portion that opens toward the second side wall and supplies oil to the second side wall side oil supply portion. The second oil passage portion has a first side wall side oil supply portion that opens toward the first side wall and supplies oil to the first side wall side oil supply portion.

[0014] Thereby, the transmission for a vehicle according to an embodiment of the present invention can supply oil to the oil supply portion on the first side wall side and the oil supply portion on the second side wall side to lubricate the lubrication site, and can improve the lubrication performance of the transmission for a vehicle.

Example

[0015] Hereinafter, a transmission for a vehicle according to an embodiment of the present invention will be described with reference to the drawings. Figures 1 to 7 are diagrams showing a vehicle transmission according to an embodiment of the present invention. In Figures 1 to 7, the up-down, front-back, and left-right directions are based on the vehicle transmission installed in the vehicle. The front-back direction of the vehicle is the front-back direction, the left-right direction (vehicle width direction) of the vehicle is the left-right direction, and the up-down direction (vehicle height direction) of the vehicle is the up-down direction.

[0016] First, the configuration will be described. In Figure 1, a vehicle transmission (hereinafter simply referred to as a transmission) 1 is installed in the vehicle, and an engine 2 is connected to the transmission 1. The transmission 1 and the engine 2 are installed in an engine room (not shown) of the vehicle.

[0017] The transmission 1 includes a transmission case 3, and the transmission case 3 has a left case 4 and a right case 5. The transmission 1 of the present embodiment constitutes a vehicle transmission, and the transmission case 3 constitutes a case member.

[0018] As shown in Figure 2, a transmission mechanism 6 is accommodated in the transmission case 3, and most of the transmission mechanism 6 is accommodated in the left case 4. The transmission mechanism 6 has an input shaft 7 extending in the vehicle width direction, and the power of the engine 2 is transmitted to the input shaft 7.

[0019] The transmission mechanism 6 has a countershaft 8 and a reverse shaft 9 extending parallel to the input shaft 7. As shown in Figure 2, a first-speed input gear 7A (see Figure 3), a reverse input gear 7R, a second-speed input gear 7B, a third-speed input gear 7C, a fourth-speed input gear 7D, a fifth-speed input gear 7E, and a sixth-speed input gear 7F are provided on the input shaft 7.

[0020] The first-speed input gear 7A, the reverse input gear 7R, and the second-speed input gear 7B are fixed to the input shaft 7 and rotate integrally with the input shaft 7, and the input gears 7C, 7D, 7E, 7F are rotatable relative to the input shaft 7.

[0021] On the counter shaft 8, there are provided a first-speed counter gear 8A (see Fig. 3), a second-speed counter gear 8B, a third-speed counter gear 8C, a fourth-speed counter gear 8D, a fifth-speed counter gear 8E, a sixth-speed counter gear 8F, a reverse counter gear (not shown), and a final drive gear 8G.

[0022] Note that the first-speed input gear 7A is located below the oil gutter 40, which will be described later, and is not shown in Fig. 1.

[0023] The reverse counter gear, the final drive gear 8G, and the third-speed counter gear 8C to the sixth-speed counter gear 8F are fixed to the counter shaft 8 and rotate integrally with the counter shaft 8. The first-speed counter gear 8A and the second-speed counter gear 8B are rotatable relative to the counter shaft 8.

[0024] The counter gears 8A to 8F mesh with the input gears 7A to 7F, and the final drive gear 8G meshes with the final driven gear 12 of the differential device 10.

[0025] On the reverse shaft 9, reverse idler gears 9A and 9B are provided. The reverse idler gear 9A is fixed to the reverse shaft 9 and rotates integrally with the reverse shaft 9. The reverse idler gear 9B is rotatable relative to the reverse shaft 9.

[0026] The reverse idler gear 9A meshes with the reverse input gear 7R, and the reverse idler gear 9B meshes with the reverse counter gear.

[0027] Synchronizing devices 31A, 31B, 31C, and 31D are installed on the input shaft 7, the counter shaft 8, and the reverse shaft 9 respectively. The synchronizing devices 31A, 31B, 31C, and 31D are movable in the axial directions of the respective shafts 7, 8, and 9.

[0028] The synchronizer 31A is installed between the 3-speed input gear 7C and the 4-speed input gear 7D. The synchronizer 31A has an inner peripheral spline (not shown), and includes a sleeve 31a that is provided movably in the axial direction of the input shaft 7, and a hub (not shown) that is located inside the sleeve 31a, is provided rotatable integrally with the input shaft 7, and has an outer peripheral spline that fits into the inner peripheral spline of the sleeve 31a.

[0029] The 3-speed input gear 7C is provided with a dog having an outer peripheral spline, and the dog rotates integrally with the 3-speed input gear 7C. The 4-speed input gear 7D is provided with a dog having an outer peripheral spline, and the dog rotates integrally with the 4-speed input gear 7D.

[0030] When the sleeve 31a is moved to the 3-speed input gear 7C side by a 3-speed - 4-speed shift fork (not shown), the inner peripheral spline of the sleeve 31a fits into the outer peripheral spline of the dog.

[0031] Thereby, the 3-speed input gear 7C is connected to the input shaft 7 via the sleeve 31a, and the rotation of the input shaft 7 is transmitted from the 3-speed input gear 7C to the counter shaft 8 via the 3-speed counter gear 8C.

[0032] At this time, the power of the engine 2 is transmitted from the input shaft 7, the 3-speed input gear 7C, and the 3-speed counter gear 8C to the counter shaft 8, and then transmitted from the final drive gear 8G to the final driven gear 12.

[0033] The power of the engine 2 transmitted to the differential device 10 is transmitted to the left and right front wheels (not shown) via the left and right drive shafts (not shown).

[0034] Note that the synchronizers 31B, 31C, and 31D have the same configuration and function as the synchronizer 31A, and detailed description thereof is omitted. Also, the synchronizers 31B, 31C, and 31D are moved in the axial directions of the respective shafts 7, 8, and 9 by shift forks (not shown) in the same manner as the synchronizer 31A.

[0035] The input gears 7A, 7B, 7C, 7D, 7E, 7F, 7R, the counter gears 8A, 8B, 8C, 8D, 8E, 8F, and the reverse idler gears 9A, 9B of this embodiment constitute gear members.

[0036] As shown in FIG. 2, the differential device 10 is housed in the transmission case 3. Specifically, the differential device 10 is housed in the bulge wall portion 5A provided in the right case 5 and the left case 4.

[0037] The bulge wall portion 5A and the partition wall 5W are arranged side by side in the front-rear direction, and the bulge wall portion 5A bulges to the right from the partition wall 5W of the right case 5. The partition wall 5W of the right case 5 is located on the left case 4 side rather than at the tip of the bulge wall portion 5A in the bulge direction, and faces the engine 2 in the axial direction of the input shaft 7.

[0038] The inside of the left case 4 and the inside of the right case 5 are partitioned by the bulge wall portion 5A and the partition wall 5W.

[0039] As shown in FIG. 2, the left case 4 includes a front wall 4A and a left side wall 4B extending rearward from the left end portion of the front wall 4A, and the left side wall 4B faces the partition wall 5W in the axial direction of the input shaft 7.

[0040] A vertical wall 4W is provided in the left case 4. The vertical wall 4W is located on the rear side of the left side wall 4B and at the right end portion of the left case 4 closer to the right case 5 than the left side wall 4B, and faces the bulge wall portion 5A in the axial direction of the input shaft 7.

[0041] The differential device 10 has a differential case 11 and a final driven gear 12 attached to the outer peripheral portion of the differential case 11 and rotating integrally with the differential case 11.

[0042] Inside the differential case 11, a differential gear mechanism 11A is housed. One end of each of the left and right drive shafts (not shown) is connected to the differential gear mechanism. The other ends of the left and right drive shafts are respectively connected to the left and right front wheels (drive wheels) (not shown), and the front wheels rotate integrally with the drive shafts. The vehicle of this embodiment is an FF (front engine front drive) vehicle.

[0043] In the transmission 1, the transmission mechanism 6 shifts the power (rotation speed) of the engine 2 and transmits the shifted power from the differential gear mechanism to the left and right drive shafts and the front wheels (drive wheels) in a differentially rotatable manner.

[0044] As shown in FIG. 2, a bearing support portion 4a is formed on the vertical wall 4W of the left case 4. The left end portion of the differential case 11 is rotatably supported by the bearing support portion 4a via a bearing 17A.

[0045] A bearing support portion 5a is formed on the bulging wall portion 5A of the right case 5. The right end portion of the differential case 11 is rotatably supported by the bearing support portion 5a of the bulging wall portion 5A via a bearing 17B.

[0046] The final drive gear 12 of this embodiment is installed offset toward the partition wall 5W side with respect to the left side wall 4B in the axial direction of the input shaft 7.

[0047] At the bottoms of the left case 4 and the right case 5, that is, at the bottom of the transmission case 3, oil O, which is lubricating oil, is stored. In a state where the engine 2 is stopped, the oil level of the oil O reaches above the lower part of the first-speed input gear 7A and below the countershaft 8 (see FIGS. 3 and 4). In this state, the final drive gear 12 is immersed in the oil O up to the vicinity of the central portion in the vertical direction.

[0048] A bearing 17C is provided at the left end portion of the input shaft 7, and the left end portion 7a of the input shaft 7 is rotatably supported by the bearing support portion 4b of the left side wall 4B of the left case 4 via the bearing 17C.

[0049] A bearing 17D is provided on the right end portion 7b side of the input shaft 7, and the right end portion 7b side of the input shaft 7 is rotatably supported by a bearing support portion 5b (see FIGS. 4 to 6) of a partition wall 5W of the light case 5 via the bearing 17D.

[0050] A bearing 17E is provided on the left end portion 8a of the counter shaft 8, and the left end portion 8a of the counter shaft 8 is rotatably supported by a bearing support portion 4c of the left side wall 4B of the left case 4 via the bearing 17E.

[0051] A bearing 17F is provided on the right end portion 8b of the counter shaft 8, and the right end portion 8b of the counter shaft 8 is rotatably supported by a bearing support portion 5c (see FIGS. 4 to 6) of a partition wall 5W of the light case 5 via the bearing 17F.

[0052] The axial length of the reverse shaft 9 is shorter than the axial lengths of the input shaft 7 and the counter shaft 8, and the left end portion of the reverse shaft 9 does not reach the left side wall 4B of the left case 4.

[0053] The front wall 4A of the left case 4 has a vertical wall portion 4C. The vertical wall portion 4C extends rearward from the front wall 4A and also extends upward from a lower wall (not shown) of the left case 4, and is located on the left side wall 4B side with respect to the reverse idler gear 9A.

[0054] A bearing support portion 4d is provided on the vertical wall portion 4C, and the left end portion 9a of the reverse shaft 9 is rotatably supported by the bearing support portion 4d via a bearing 17G.

[0055] A bearing 17H is provided on the right end portion 9b of the reverse shaft 9, and the right end portion 9b of the reverse shaft 9 is rotatably supported by a bearing support portion 5d (see FIGS. 4 to 6) of a partition wall 5W of the light case 5 via the bearing 17H.

[0056] The input shaft 7, the counter shaft 8, and the reverse shaft 9 of the present embodiment constitute a rotating shaft. The partition wall 5W constitutes a first side wall, and the left side wall 4B constitutes a second side wall.

[0057] The right end portion 7b of the input shaft 7 constitutes one end portion of the rotating shaft, and the left end portion 7a of the input shaft 7 constitutes the other end portion of the rotating shaft. The right end portion 8b of the counter shaft 8 constitutes one end portion of the rotating shaft, and the left end portion 8a of the counter shaft 8 constitutes the other end portion of the rotating shaft. The right end portion 9b of the reverse shaft 9 constitutes one end portion of the rotating shaft.

[0058] And the partition wall 5W rotatably supports the right end portion 7b side of the input shaft 7, the right end portion 8b side of the counter shaft 8, and the right end portion 9b side of the reverse shaft 9, and the left side wall 4B rotatably supports the left end portion 7a side of the input shaft 7 and the left end portion 8a side of the counter shaft 8.

[0059] An oil gutter 40 is provided in the left case 4. As shown in FIG. 3, the oil gutter 40 is installed above the input shaft 7 and the counter shaft 8 on the front side of the final driven gear 12 and on the rear side of the reverse shaft 9.

[0060] As shown in FIGS. 2 and 7, the oil gutter 40 has an oil introduction portion 41, a first oil passage portion 42, and a second oil passage portion 43.

[0061] As shown in FIG. 2, the oil introduction portion 41 opens toward the final driven gear 12 in a direction perpendicular to the axial direction of the input shaft 7. That is, in a top view of the transmission 1, the oil introduction portion 41 is installed side by side with the final driven gear 12 in a direction perpendicular to the axial direction of the input shaft 7.

[0062] The oil introduction portion 41 is formed such that the width in the axial direction of the input shaft 7 increases from the front end portion toward the rear end portion. The direction perpendicular to the axial direction of the input shaft 7 and the front-rear direction are the same direction. That is, the oil introduction portion 41 is installed at a position where it can capture the oil scraped up forward by the final driven gear 12.

[0063] As a result, the oil introduced by the final drive gear 12 is surely introduced into the oil introduction portion 41. Since the width of the rear end portion of the oil introduction portion 41 is formed to be larger than the width of the front end portion, more oil lifted up by the final drive gear 12 can be efficiently captured.

[0064] The first oil passage portion 42 extends from the oil introduction portion 41 along the axial direction of the input shaft 7 toward the left side wall 4B, and is located between the input shaft 7 and the counter shaft 8 in the front-rear direction.

[0065] The first oil passage portion 42 includes a partition wall side oil passage portion 42A and a left side wall side oil passage portion 42B.

[0066] The oil introduction portion 41 is communicated with the partition wall side oil passage portion 42A, and the oil introduced into the oil introduction portion 41 is introduced from the oil introduction portion 41 into the partition wall side oil passage portion 42A.

[0067] The left side wall side oil passage portion 42B is located on the left side wall 4B side with respect to the partition wall side oil passage portion 42A, and the width in the front-rear direction in the left side wall side oil passage portion 42B is formed to be smaller than the width in the front-rear direction in the partition wall side oil passage portion 42A.

[0068] The second oil passage portion 43 is installed on the left side wall 4B side with respect to the final drive gear 12. The second oil passage portion 43 branches forward from the partition wall side oil passage portion 42A of the first oil passage portion 42 with the stepped portion 43A (see FIG. 7) as a boundary, and extends forward along the wall surface 5w of the partition wall 5W.

[0069] As shown in FIGS. 3 and 4, the stepped portion 43A extends upward from the front end portion of the partition wall side oil passage portion 42A, and the second oil passage portion 43 is communicated with the upper end of the stepped portion 43A. As a result, the second oil passage portion 43 is located above the first oil passage portion 42.

[0070] That is, the stepped portion 43A is composed of a vertical wall for installing the second oil passage portion 43 above the first oil passage portion 42.

[0071] As shown in FIG. 2, an oil supply port 42a is provided at the tip of the first oil passage portion 42 in the extending direction, that is, at the left end of the first oil passage portion 42.

[0072] The oil supply port 42a is located above the bearings 17C and 17E of the input shaft 7 and opens toward the left side wall 4B. Since the bearings 17C and 17E are located inside the bearing support portions 4b and 4c, the oil supply port 42a is located above the bearing support portions 4b and 4c.

[0073] The oil scraped up by the final driven gear 12 is introduced into the oil introduction portion 41, then guided to the left side wall 4B side by the first oil passage portion 42, and supplied from the oil supply port 42a to the left side wall 4B side.

[0074] Notched oil grooves (not shown) are formed in the bearing support portions 4b and 4c of the left side wall 4B, and the oil discharged from the oil supply port 42a to the left side wall 4B is supplied from the oil grooves to the inside of the bearing support portions 4b and 4c.

[0075] Thereby, the bearing 17C of the input shaft 7 and the bearing 17E of the counter shaft 8 are lubricated by the oil.

[0076] Also, oil passages (not shown) are formed inside the input shaft 7 and the counter shaft 8. These oil passages extend along the axial direction of the input shaft 7 and the counter shaft 8, and the left ends are open.

[0077] The oil supplied from the oil grooves to the inside of the bearing support portions 4b and 4c flows through the oil passages along the axial direction of the input shaft 7 and the counter shaft 8, and then is discharged radially outward of the input shaft 7 and the counter shaft 8 through radial holes (not shown) formed in the radial direction of the input shaft 7 and the counter shaft 8.

[0078] As a result, the input gears 7C, 7D, 7E, 7F and the synchronizers 31A, 31B are lubricated by oil, and the counter gears 8A, 8B and the synchronizer 31C are lubricated by oil.

[0079] The input gears 7C, 7D, 7E, 7F, the counter gears 8A, 8B, the bearings 17C, 17E and the synchronizers 31A, 31B, 31C of the present embodiment constitute lubrication parts.

[0080] On the other hand, a front oil supply port 43a and a rear oil supply port 43b are provided in the second oil passage portion 43, and the front oil supply port 43a and the rear oil supply port 43b are open toward the partition wall 5W.

[0081] A partition wall 43B is provided in the second oil passage portion 43. The partition wall 43B extends from the stepped portion 43A toward the partition wall 5W, and the second oil passage portion 43 is partitioned by the partition wall 43B into a partition wall side oil passage portion 42A and a front oil passage portion 43C that communicates the front oil supply port 43a, and a rear oil passage portion 43D that communicates the partition wall side oil passage portion 42A and the rear oil supply port 43b.

[0082] The front oil supply port 43a and the rear oil supply port 43b of the present embodiment constitute a first side wall side oil supply portion, and the bearing support portions 5b, 5d constitute an oil supply portion and a first side wall side oil supply portion.

[0083] The front oil supply port 43a constitutes a front oil supply portion, and the rear oil supply port 43b constitutes a rear oil supply portion.

[0084] The bearing support portion 5d constitutes a front oil supply portion, and the bearing support portion 5b constitutes a rear oil supply portion.

[0085] The oil supply port 42a constitutes an oil supply portion and a second side wall side oil supply portion, and the bearing support portions 4b, 4c constitute a second side wall side oil supply portion.

[0086] The oil scooped up by the final drive gear 12 is guided from the oil introduction portion 41 to the partition wall side oil passage portion 42A of the first oil passage portion 42, and then is guided to the second oil passage portion 43 after overcoming the step portion 43A.

[0087] That is, the partition wall side oil passage portion 42A distributes the oil guided from the oil introduction portion 41 to the oil that guides the oil to the left side wall side oil passage portion 42B and the oil that guides the oil to the second oil passage portion 43.

[0088] In addition to this, the step portion 43A can adjust the flow rate of the oil introduced from the oil introduction portion 41 to the partition wall side oil passage portion 42A and the second oil passage portion 43.

[0089] Specifically, the partition wall side oil passage portion 42A and the second oil passage portion 43 are installed at a position where the second oil passage portion 43 is higher than the partition wall side oil passage portion 42A by the step portion 43A.

[0090] Thereby, the oil guided from the oil introduction portion 41 to the partition wall side oil passage portion 42A is adjusted so that the flow rate of the oil flowing from the partition wall side oil passage portion 42A to the left side wall side oil passage portion 42B is larger than the flow rate of the oil flowing from the partition wall side oil passage portion 42A to the second oil passage portion 43 by the step portion 43A.

[0091] In the transmission 1, when the rotational speed of the engine 2 increases, the rotational speed of the final drive gear 12 also increases. Therefore, the flow rate of the oil scooped up by the final drive gear 12 per unit time increases, and the flying distance of the oil also increases.

[0092] For this reason, the flow rate of the oil flowing from the partition wall side oil passage portion 42A to the left side wall side oil passage portion 42B is larger as the rotational speed of the engine 2 decreases than the flow rate of the oil flowing from the partition wall side oil passage portion 42A to the second oil passage portion 43 by the step portion 43A. The step portion 43A of the present embodiment constitutes a flow rate adjustment portion.

[0093] As shown in FIGS. 4 to 6, oil grooves 5m and 5n are provided above the bearing support portions 5b and 5d of the partition wall 5W, and the oil grooves 5m and 5n communicate with the inner and outer sides of the bearing support portions 5b and 5d, respectively.

[0094] A bulging portion 44 is provided on the partition wall 5W. The bulging portion 44 is located below the front oil supply port 43a (see FIG. 6) and bulges from the partition wall 5W toward the left side wall 4B.

[0095] As shown in FIG. 6, the bearing support portion 5d is provided in front of the rear portion 44a of the bulging portion 44 below the bulging portion 44, and the bearing support portion 5b is provided behind the bearing support portion 5d.

[0096] In the front-rear direction, the bulging portion 44 is provided between the bearing support portion 5b and the bearing support portion 5d and is connected to the bearing support portion 5b.

[0097] The bulging portion 44 has an upper surface portion 44A and a vertical surface portion 44B. The rear portion 44a of the upper surface portion 44A faces the front oil supply port 43a in the vertical direction, and in the axial direction of the input shaft 7, the rear portion 44a of the upper surface portion 44A overlaps the front oil supply port 43a.

[0098] The vertical surface portion 44B extends downward from the front end portion 44b of the upper surface portion 44A, and the bearing support portion 5d is provided below the vertical surface portion 44B. Here, the rear portion 44a of the upper surface portion 44A indicates a certain range on the front side from the rear end of the upper surface portion 44A, and the front end portion 44b of the upper surface portion 44A indicates the edge at the front end of the upper surface portion 44A.

[0099] As shown in FIG. 5, the upper surface portion 44A widens in the axial direction (vehicle width direction) of the input shaft 7 from the rear side to the front side and faces the oil groove 5n of the bearing support portion 5d in the vertical direction.

[0100] The front oil supply port 43a faces the wall surface portion 5e of the partition wall 5W above the upper surface portion 44A in the axial direction of the input shaft 7, and a minute gap is formed in the axial direction of the input shaft 7 between the front oil supply port 43a and the wall surface portion 5e.

[0101] That is, the front oil supply port 43a is close to the wall surface portion 5e. The wall surface portion 5e of the present embodiment is a portion of the wall surface 5w of the partition wall 5W that is above the upper surface portion 44A.

[0102] The oil discharged from the front oil supply port 43a collides with the wall surface portion 5e, then falls downward along the wall surface portion 5e, collides with the rear end of the upper surface portion 44A of the bulging portion 44, and is guided from the rear portion 44a to the front end portion 44b of the upper surface portion 44A.

[0103] The oil guided to the front end portion 44b of the upper surface portion 44A is guided to the oil groove 5n along the vertical surface portion 44B by its own weight, and then is guided inward of the bearing support portion 5d through the oil groove 5n. Thereby, the bearing 17H supported by the bearing support portion 5d is lubricated by the oil.

[0104] The rear oil supply port 43b faces the oil groove 5m in the vertical direction, and the oil discharged from the rear oil supply port 43b is guided inward of the bearing support portion 5b through the oil groove 5m. Thereby, the bearing 17D supported by the bearing support portion 5b is lubricated by the oil. The bulging portion 44 of the present embodiment constitutes a guide portion.

[0105] On the other hand, an oil passage (not shown) is formed inside the reverse shaft 9. The oil passage extends along the axial direction of the reverse shaft 9, and the right end portion of the oil passage is open.

[0106] The oil supplied from the rear oil supply port 43b inward of the bearing support portion 5d through the oil groove 5n flows through the oil passage along the axial direction of the reverse shaft 9, and then is discharged radially outward of the reverse shaft 9 through a radial hole (not shown) formed in the radial direction of the reverse shaft 9 from the oil passage.

[0107] Thereby, the reverse idler gears 9A, 9B and the synchronizer 31C are lubricated by the oil. The reverse idler gears 9A, 9B, the bearings 17D, 17F and the synchronizer 31D of the present embodiment constitute lubricated portions.

[0108] As shown in FIG. 2, oil drain holes 42s, 42t, 42u and oil collision walls 42S, 42T, 42U are formed in the first oil passage portion 42 of the oil gutter 40 (see FIG. 7).

[0109] The oil drain hole 42s is located above the meshing portion of the fifth-speed input gear 7E and the fifth-speed counter gear 8E. The oil flowing through the first oil passage portion 42 toward the oil supply port 42a is supplied from the oil drain hole 42s to the meshing portion of the fifth-speed input gear 7E and the fifth-speed counter gear 8E.

[0110] Thereby, the meshing portion of the fifth-speed input gear 7E and the fifth-speed counter gear 8E is lubricated by oil.

[0111] The oil collision wall 42S is provided on the oil supply port 42a side with respect to the oil drain hole 42s, and protrudes upward from the bottom surface of the first oil passage portion 42. The oil collision wall 42S receives the oil flowing through the first oil passage portion 42 toward the oil supply port 42a and causes it to fall from the oil drain hole 42s.

[0112] The oil drain hole 42t is located above the meshing portion of the fourth-speed input gear 7D and the fourth-speed counter gear 8D. The oil flowing through the first oil passage portion 42 toward the oil supply port 42a is supplied from the oil drain hole 42t to the meshing portion of the fourth-speed input gear 7D and the fourth-speed counter gear 8D.

[0113] Thereby, the meshing portion of the fourth-speed input gear 7D and the fourth-speed counter gear 8D is lubricated by oil.

[0114] The oil collision wall 42T is provided on the oil supply port 42a side with respect to the oil drain hole 42t, and protrudes upward from the bottom surface of the first oil passage portion 42. The oil collision wall 42T receives the oil flowing through the first oil passage portion 42 toward the oil supply port 42a and causes it to fall from the oil drain hole 42t.

[0115] The oil drain hole 42u is located above the meshing portion of the 3-speed input gear 7C and the 3-speed counter gear 8C. The oil flowing through the first oil passage portion 42 toward the oil supply port 42a is supplied from the oil drain hole 42u to the meshing portion of the 3-speed input gear 7C and the 3-speed counter gear 8C.

[0116] Thereby, the meshing portion of the 3-speed input gear 7C and the 3-speed counter gear 8C is lubricated by the oil.

[0117] The oil collision wall 42U is provided on the oil supply port 42a side with respect to the oil drain hole 42u, and protrudes upward from the bottom surface of the first oil passage portion 42. The oil collision wall 42U receives the oil flowing through the first oil passage portion 42 toward the oil supply port 42a and drops it from the oil drain hole 42u.

[0118] Next, the effects of the transmission 1 of the present embodiment will be described. When the vehicle is moving forward, the oil O stored at the bottom of the transmission case 3 is scraped up by the final driven gear 12 that rotates counterclockwise R in the leftward view of FIGS. 3 and 4 and is flown forward. In FIGS. 3, 4, 6, and 7, the oil flow is indicated by oil O1 to oil O4.

[0119] The transmission 1 of the present embodiment includes a transmission case 3. The transmission case 3 has a partition wall 5W that rotatably supports the right end portion 7b of the input shaft 7, the right end portion 8b of the counter shaft 8, and the right end portion 9b of the reverse shaft 9, and a left side wall 4B that rotatably supports the left end portion 7a of the input shaft 7 and the left end portion 8a side of the counter shaft 8, and houses a transmission mechanism 6 and a differential device 10.

[0120] Further, the transmission 1 includes an oil gutter 40 that is housed in the transmission case 3 and captures the oil O1 (see FIGS. 3 and 4) scraped up by the final driven gear 12 and guides it to the oil supply portion, and the final driven gear 12 is installed offset toward the partition wall 5W side with respect to the left side wall 4B in the axial direction of the input shaft 7.

[0121] The oil supply section is configured to include bearing support portions 4b and 4c provided on the left side wall 4B and bearing support portions 5b and 5c provided on the partition wall 5W.

[0122] The oil gutter 40 has an oil introduction section 41, a first oil passage section 42, and a second oil passage section 43.

[0123] The oil introduction section 41 opens toward the final driven gear 12, the first oil passage section 42 extends from the oil introduction section 41 along the axial direction of the input shaft 7 to the left side wall 4B, and the second oil passage section 43 branches from the first oil passage section 42 and extends along the partition wall 5W.

[0124] The first oil passage section 42 opens toward the left side wall 4B and has an oil supply port 42a for supplying oil to the bearing support portions 4b and 4c. The second oil passage section 43 opens toward the partition wall 5W and has a front oil supply port 43a and a rear oil supply port 43b for supplying oil to the bearing support portions 5b and 5d, respectively.

[0125] As a result, the oil O1 scraped up by the final driven gear 12 is introduced into the oil introduction section 41, and then, as shown by the oil O2 in FIG. 7, is guided from the first oil passage section 42 toward the oil supply port 42a and then discharged from the oil supply port 42a.

[0126] The oil discharged from the oil supply port 42a is supplied to the bearing support portions 4b and 4c, so that the bearings 17C and 17E, the input gears 7C, 7D, 7E, and 7F, the counter gears 8A and 8B, and the synchronizing devices 31A, 31B, and 31C can be lubricated with oil.

[0127] Also, the oil O1 introduced into the oil introduction part 41 is introduced from the first oil passage part 42 to the second oil passage part 43, and after being guided to the front oil supply port 43a and the rear oil supply port 43b through the front oil passage part 43C and the rear oil passage part 43D respectively (shown as the oil O3 and O4 in FIG. 7), it is discharged from the front oil supply port 43a and the rear oil supply port 43b.

[0128] The oil O3 and O4 discharged from the front oil supply port 43a and the rear oil supply port 43b are supplied to the oil grooves 5m and 5n of the bearing support parts 5b and 5d, so that the bearings 17D, 17F, the reverse idler gears 9A, 9B and the synchronizer 31D can be lubricated with oil.

[0129] In this way, the transmission 1 of this embodiment can supply oil to the bearing support parts 5b and 5d on the partition wall 5W side and the bearing support parts 4b and 4c on the left side wall 4B side to lubricate the input gears 7C, 7D, 7E, 7F, the counter gears 8A, 8B, the reverse idler gears 9A, 9B, the bearings 17C, 17D, 17F, 17E and the synchronizers 31A, 31B, 31C, 31D which are the lubrication parts, and can improve the lubrication performance of the transmission 1.

[0130] Also, according to the transmission 1 of this embodiment, since the oil O1 scraped up by the final driven gear 12 can be temporarily stored in the oil gutter 40, the oil level of the oil O stored at the bottom of the transmission case 3 can be reduced, and the stirring resistance of the final driven gear 12 can be reduced. Therefore, the power transmission efficiency from the engine 2 to the transmission 1 can be improved, and the fuel consumption of the engine 2 can be reduced.

[0131] Here, when the engine 2 is rotating at a high speed, the rotation speed of the final driven gear 12 becomes high, and the forward flying distance of the oil scraped up by the final driven gear 12 becomes long.

[0132] On the other hand, when the engine 2 is rotating at a low speed, the rotation speed of the final driven gear 12 becomes low, and the forward flying distance of the oil scraped up by the final driven gear 12 becomes shorter than that when the engine 2 is rotating at a high speed.

[0133] Therefore, when the engine 2 is rotating at a low speed, the amount of oil supplied to the front of the oil gutter 40 is less than that when the engine 2 is rotating at a high speed.

[0134] According to the transmission 1 of the present embodiment, since the second oil passage portion 43 extends forward along the wall surface 5w of the partition wall 5W from the first oil passage portion 42, the oil introduced into the oil introduction portion 41 when the engine 2 is rotating at a low speed can be guided forward from the first oil passage portion 42 through the front oil passage portion 43C and the rear oil passage portion 43D of the second oil passage portion 43 (see the oil O3 and O4 in FIG. 7).

[0135] Therefore, a sufficient amount of oil can be supplied to the bearing support portions 5b and 5d when the engine 2 is rotating at a low speed, and the lubrication performance of the reverse idler gears 9A and 9B, the bearings 17D and 17F, and the synchronizer 31D can be improved. As a result, the lubrication performance of the transmission 1 can be improved.

[0136] Further, the oil O1 introduced from the oil introduction portion 41 into the first oil passage portion 42 is divided into the oil guided from the partition wall side oil passage portion 42A of the first oil passage portion 42 to the left side wall side oil passage portion 42B (shown as the oil O2 in FIG. 7) and the oil guided from the partition wall side oil passage portion 42A to the second oil passage portion 43 (shown as the oil O3 and O4 in FIG. 7).

[0137] Therefore, it is not necessary to provide a dedicated stage for dividing the oil between the left side wall 4B side and the partition wall 5W in the oil gutter 40, and the oil gutter 40 can be prevented from becoming larger in size.

[0138] Further, by extending the second oil passage portion 43 forward along the wall surface 5w of the partition wall 5W from the first oil passage portion 42, the second oil passage portion 43 can be extended in the front-rear direction along the flow of the oil scattered forward by the final driven gear 12.

[0139] Therefore, oil can flow smoothly from the first oil passage portion 42 to the second oil passage portion 43, and the lubrication performance of the reverse idler gears 9A and 9B, the bearings 17D and 17F, and the synchronizer 31D can be improved more effectively. As a result, the lubrication performance of the transmission 1 can be improved more effectively.

[0140] Further, according to the transmission 1 of the present embodiment, a stepped portion 43A is provided at the branching location between the first oil passage portion 42 and the second oil passage portion 43, and the stepped portion 43A adjusts the flow rate of the oil introduced from the oil introduction portion 41 into the first oil passage portion 42 and the second oil passage portion 43.

[0141] Thereby, the amount of oil supplied from the oil supply port 42a of the first oil passage portion 42 to the bearing support portions 4b and 4c, and the amount of oil supplied from the front oil supply port 43a and the rear oil supply port 43b of the second oil passage portion 43 to the bearing support portions 5b and 5d can be easily adjusted, and the lubrication performance of the transmission 1 can be improved more effectively.

[0142] Note that although the flow rate adjustment portion of the present embodiment is constituted by the stepped portion 43A, the flow rate adjustment portion may be constituted by a partition plate provided at the branching location between the first oil passage portion 42 and the second oil passage portion 43 and having an opening for restricting the amount of oil introduced from the first oil passage portion 42 to the second oil passage portion 43, and is not limited thereto.

[0143] Further, according to the transmission 1 of the present embodiment, the partition wall 5W is located below the front oil supply port 43a, and has a bulging portion 44 protruding from the partition wall 5W toward the left side wall 4B, and a bearing support portion 5d located below the bulging portion 44 and in front of the rear portion 44a of the bulging portion 44. The bulging portion 44 guides the oil supplied from the front oil supply port 43a to the bearing support portion 5d.

[0144] Thereby, even when the bearing support portion 5d is installed in front of the front oil supply port 43a, the oil can be supplied to the bearing support portion 5d by the bulging portion 44. Therefore, the length of the second oil passage portion 43 in the front-rear direction can be shortened.

[0145] As a result, it is possible to prevent the oil gutter 40 from becoming larger in size, and it is possible to prevent an increase in the installation space for the oil gutter 40 with respect to the transmission case 3.

[0146] Further, according to the transmission 1 of the present embodiment, the bulging portion 44 has an upper surface portion 44A that faces the front oil supply port 43a in the vertical direction, and a vertical surface portion 44B that extends downward from the front end portion 44b of the upper surface portion 44A. The front oil supply port 43a faces the wall surface portion 5e of the partition wall 5W above the upper surface portion 44A in the axial direction of the input shaft 7.

[0147] The upper surface portion 44A widens in the axial direction of the input shaft 7 from the rear side toward the front side, and a bearing support portion 4d is provided below the vertical surface portion 44B.

[0148] Thereby, the oil discharged from the front oil supply port 43a collides with the wall surface portion 5e, then falls onto the rear portion 44a of the upper surface portion 44A of the bulging portion 44 along the wall surface portion 5e, and is guided forward along the upper surface portion 44A from the rear portion 44a (see the oil O3 in FIG. 6).

[0149] The oil guided forward along the upper surface portion 44A from the rear portion 44a is guided to the oil groove 5n along the vertical surface portion 44B by its own weight, and then is guided inward of the bearing support portion 5d through the oil groove 5n.

[0150] Thereby, a large amount of oil can be guided to the bearing support portion 5d by the upper surface portion 44A that widens in the axial direction of the input shaft 7 from the rear side toward the front side, and the lubrication performance of the bearings 17D and 17F, the reverse idler gears 9A and 9B, and the synchronizer 31D can be more effectively improved. As a result, the lubrication performance of the transmission 1 can be improved.

[0151] In addition, since the front oil supply port 43a is opposed to the wall surface portion 5e of the partition wall 5W above the upper surface portion 44A in the axial direction of the input shaft 7, the flow of the oil discharged from the front oil supply port 43a is changed downward by the wall surface portion 5e, and can be efficiently guided to the upper surface portion 44A of the bulging portion 44. Therefore, the amount of oil introduced into the inner side of the bearing support portion 5d through the oil groove 5n can be surely increased.

[0152] Also, as shown in FIG. 6, the oil O4 discharged from the rear oil supply port 43b is guided to the inner side of the bearing support portion 5b through the oil groove 5m, and the bearing 17D supported by the bearing support portion 5b is lubricated by the oil.

[0153] The transmission 1 of the present embodiment also has a bearing support portion 5b provided behind the bearing support portion 5d, and the second oil passage portion 43 includes a front oil supply port 43a that supplies oil to the bearing support portion 5d through the bulging portion 44, and a rear oil supply port 43b that supplies oil to the bearing support portion 5b.

[0154] Thereby, the oil sent forward from the first oil passage portion 42 is discharged from the front oil supply port 43a and the rear oil supply port 43b through the front oil passage portion 43C and the rear oil passage portion 43D respectively (see the oils O3 and O4 in FIG. 7), and can be supplied to the bearing support portion 5b and the bearing support portion 5d. Therefore, the lubrication performance of the transmission 1 can be more effectively improved.

[0155] Note that the transmission 1 of the present embodiment may be applied to a hybrid vehicle. In this case, for example, the power of the motor may be transmitted to the final drive gear 12.

[0156] Although embodiments of the present invention have been disclosed, it is obvious that those skilled in the art can make changes without departing from the scope of the present invention. It is intended that all such modifications and equivalents be included in the following claims.

Explanation of reference numerals

[0157] 1... Transmission (vehicle transmission), 2... Engine, 3... Transmission case, 4B... Left side wall (second side wall), 4b, 4c... Bearing support part (oil supply part, second side wall side oil supply part), 5W... Partition wall (first side wall), 5b... Bearing support part (oil supply part, rear side oil supply part), 5d... Bearing support part (oil supply part, front side oil supply part), 5e... Wall surface part (wall surface part of the first side wall), 5w... Wall surface (wall surface of the first side wall), 6... Transmission mechanism, 7... Input shaft (rotating shaft), 7a... Left end part (other end part of the rotating shaft), 7A, 7B, 7C, 7D, 7E, 7F... Input gear (gear member), 7b... Right end part (one end part of the rotating shaft), 8... Counter shaft (rotating shaft), 8A, 8B, 8C, 8D, 8E, 8F... Counter gear (gear member), 8a... Left end part (other end part of the rotating shaft), 8b... Right end part (one end part of the rotating shaft), 9... Reverse shaft (rotating shaft), 9A, 9B... Reverse idler gear (gear member), 9a... Left end part (other end part of the rotating shaft), 9b... Right end part (one end part of the rotating shaft), 10... Differential device, 12... Final driven gear, 40... Oil gutter, 41... Oil introduction part, 42... First oil passage part, 42a... Oil supply port (oil supply part, second side wall side oil supply port), 43... Second oil passage part, 43A... Step part (flow rate adjustment part), 43a... Front side oil supply port (first side wall side oil supply port, front side oil supply port), 43b... Rear side oil supply port (first side wall side oil supply port, rear side oil supply port), 44... Bulging part (guide part), 44A... Upper surface part, 44B... Vertical surface part

Claims

1. A transmission mechanism having a plurality of rotating shafts installed in parallel and gear members provided on the plurality of rotating shafts respectively and meshing with each other, for changing the rotation of an internal combustion engine and outputting the changed rotation; A differential device having a final drive gear to which power is transmitted from the transmission mechanism, for transmitting power to left and right drive wheels; A transmission case having a first side wall rotatably supporting one end side of the plurality of rotating shafts and a second side wall rotatably supporting the other end side of the plurality of rotating shafts, for housing the transmission mechanism and the differential device; An oil gutter housed in the transmission case, for capturing oil scraped up by the final drive gear and guiding the oil to an oil supply portion; A vehicle transmission in which the final drive gear is installed biased toward the first side wall with respect to the second side wall in the axial direction of the plurality of rotating shafts, The oil supply portion includes a first side wall side oil supply portion provided on the first side wall and a second side wall side oil supply portion provided on the second side wall. The oil gutter has an oil introduction portion, a first oil passage portion, and a second oil passage portion. The oil introduction portion opens toward the final drive gear. The first oil passage portion extends from the oil introduction portion along the axial direction of the plurality of rotating shafts to the second side wall. The second oil passage portion branches from the first oil passage portion and extends along the wall surface of the first side wall. The first oil passage portion has a second side wall side oil supply portion that opens toward the second side wall and supplies oil to the second side wall side oil supply portion. The second oil passage portion has a first side wall side oil supply portion that opens toward the first side wall and supplies oil to the first side wall side oil supply portion. The first side wall is located below the first side wall side oil supply part and has a guide part that protrudes from the first side wall toward the second side wall. The first side wall side oil supply-receiving part is located below the guide part and has a front side oil supply-receiving part that is located on the front side in the vehicle's longitudinal direction relative to the rear part of the guide part. The guide part guides the oil discharged from the first side wall side oil supply part to the front side oil supply-receiving part. The guide part has an upper surface part that faces the first side wall's wall surface above the upper surface part in the axial direction of the plurality of rotating shafts, and a vertical surface part that extends downward from the front end part of the upper surface part. The first side wall side oil supply part faces the wall surface part of the first side wall above the upper surface part in the axial direction of the plurality of rotating shafts. The upper surface part widens in the axial direction of the plurality of rotating shafts from the rear side to the front side in the vehicle's longitudinal direction. A vehicle transmission, characterized in that the front side oil supply-receiving part is provided below the vertical surface part.

2. The second oil passage part extends forward in the vehicle's longitudinal direction along the wall surface of the first side wall from the first oil passage part, according to the vehicle transmission described in claim 1.

3. A flow rate adjustment part is provided at the branching location of the first oil passage part and the second oil passage part. The flow rate adjustment part adjusts the flow rate of the oil introduced from the oil introduction part to the first oil passage part and the second oil passage part, according to the vehicle transmission described in claim 1 or claim 2.

4. The first side wall side oil supply-receiving part has a rear side oil supply-receiving part provided on the rear side of the front side oil supply-receiving part in the vehicle's longitudinal direction. The first side wall side oil supply portion is configured to include a front side oil supply portion that supplies oil to the front side oil supply target portion through the guide portion, and a rear side oil supply portion that supplies oil to the rear side oil supply target portion. The transmission for a vehicle according to any one of claims 1 to 3, characterized in that.

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