Work vehicle

Abstract

To provide a service vehicle which includes a transmission case for housing a gear transmission which outputs power from a power source to a travel device and which enables a lubrication oil to be taken out from the transmission case while making air less likely to be suctioned from an oil take-out port even if a vehicle body is inclined and maintaining rigidity of the transmission case.SOLUTION: A service vehicle includes an oil take-out port which is open on a bottom part at one end side as seen in a vehicle body fore and aft direction and a vehicle body lateral direction of a transmission case 3 to take out a lubrication oil from the transmission case 3. The service vehicle further includes a partition part 100, which partitions an internal space of the transmission case 3 into a first space part A1 along a side wall part 3g of the transmission case 3 and a second space part A2 other than the first space part A1 and brings the first space part A1 in a sealed state, at the other end side as seen in the vehicle body fore and aft direction and the vehicle body lateral direction of the transmission case 3.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a work vehicle. [Background technology]

[0002] Some work vehicles are equipped with a gear transmission that changes the speed of power from a power source and outputs it to a traveling device, and a transmission case that houses the gear transmission. An example of this type of work vehicle is the tractor shown in Patent Document 1. Some of these tractors are equipped with a transmission case and a gear transmission (speed-changing transmission device) housed in the transmission case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-95058 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned work vehicle, an oil outlet opening into the bottom of the transmission case is provided to enable the removal of lubricating oil stored in the transmission case. If the vehicle body tilts and the transmission case tilts, the lubricating oil stored inside the transmission case flows toward the side opposite the oil outlet, and the amount of lubricating oil remaining in the area where the oil outlet is located decreases so that even a part of the oil outlet rises above the oil surface, air will be sucked into the pump connected to the oil outlet.

[0005] To provide a work vehicle capable of extracting lubricating oil while preventing air from being sucked in from an oil outlet even when the vehicle body is tilted, while using a simple measure and maintaining the rigidity of a transmission case. [Means for solving the problem]

[0006] The work vehicle according to the present invention comprises: The vehicle is provided with a gear transmission that changes the speed of power from a power source and outputs the power to a traveling device, a transmission case that houses the gear transmission, and an oil outlet that opens at a bottom of one end of the transmission case in the vehicle body longitudinal direction and that takes out lubricating oil from inside the transmission case, and a partition portion is provided at the other end of the transmission case in the vehicle body longitudinal direction, which partitions the internal space of the transmission case into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion and seals the first space portion, the partition portion being integrally molded inside the side wall portion, and the first space portion being formed by the side wall portion and the partition portion. The oil outlet is provided at an upper portion and a lower portion of the bottom, and a communication chamber forming member is provided at the bottom on the outer surface side of the side wall portion of the transmission case and forms a communication chamber between the side wall portion and the communication chamber forming member, the oil outlet of the upper portion opens at an upper portion of the communication chamber forming member, the oil outlet of the lower portion opens at a lower portion of the communication chamber forming member, and a communication hole that communicates the communication chamber with the internal space of the transmission case is opened at a portion of the side wall portion facing the oil outlet of the lower portion. is.

[0007] With this configuration, no lubricating oil enters the sealed first space, so even if the transmission case tilts in the fore-aft direction of the vehicle body due to the fore-aft tilt of the vehicle body and the lubricating oil flows from the side where the oil outlet is located to the opposite side, less lubricating oil accumulates on the opposite side to the side where the oil outlet is located, and more lubricating oil remains in the area where the oil outlet is located, compared to a case where there is no first space. In other words, even if the vehicle body tilts in the fore-aft direction, the oil outlet is less likely to protrude above the oil surface, and lubricating oil can be taken out of the transmission case while making it difficult for air to be sucked in through the oil outlet.

[0008] Since the first space portion of the internal space of the transmission case is partitioned from the second space portion and sealed, a simple measure of just providing a partition portion can be achieved, and there is no need to reduce the outer diameter of the transmission case so as to narrow the internal space of the transmission case on the side opposite the side where the oil outlet of the transmission case is located, and the rigidity of the transmission case can be maintained.

[0009] Another work vehicle according to the present invention includes: The vehicle is provided with a gear transmission that changes the speed of power from a power source and outputs the power to a traveling device, a transmission case that houses the gear transmission, and an oil outlet that opens at a bottom of one end of the transmission case in the left-right direction of the vehicle body and that takes out lubricating oil from inside the transmission case, and a partition portion is provided at the other end of the transmission case in the left-right direction of the vehicle body that divides the internal space of the transmission case into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion and seals the first space portion, the partition portion being integrally molded inside the side wall portion, and the first space portion being formed by the side wall portion and the partition portion. The oil outlet is provided at an upper portion and a lower portion of the bottom, and a communication chamber forming member is provided at the bottom on the outer surface side of the side wall portion of the transmission case and forms a communication chamber between the side wall portion and the communication chamber forming member, the oil outlet of the upper portion opens at an upper portion of the communication chamber forming member, the oil outlet of the lower portion opens at a lower portion of the communication chamber forming member, and a communication hole that communicates the communication chamber with the internal space of the transmission case is opened at a portion of the side wall portion facing the oil outlet of the lower portion. is.

[0010] With this configuration, since no lubricating oil enters the sealed first space, even if the transmission case tilts left and right due to the left and right tilt of the vehicle body and the lubricating oil flows from the side where the oil outlet is located to the opposite side, less lubricating oil accumulates on the opposite side to the side where the oil outlet is located and more lubricating oil remains in the area where the oil outlet is located, compared to a case where there is no first space. In other words, even if the vehicle body tilts left and right, the oil outlet is less likely to protrude above the oil surface, and lubricating oil can be taken out of the transmission case while making it difficult for air to be sucked in through the oil outlet.

[0011] Since the first space portion of the internal space of the transmission case is partitioned from the second space portion and sealed, a simple measure of just providing a partition portion can be achieved, and there is no need to reduce the outer diameter of the transmission case so as to narrow the internal space of the transmission case on the side opposite the side where the oil outlet of the transmission case is located, and the rigidity of the transmission case can be maintained.

[0012] Another work vehicle according to the present invention includes: The vehicle is provided with a gear transmission that changes the speed of power from a power source and outputs it to a traveling device, a transmission case that houses the gear transmission, and an oil outlet that opens at a bottom of one end of the transmission case in the vehicle front-rear direction and the vehicle left-right direction and that takes out lubricating oil from inside the transmission case, and a partition part is provided at the other end of the transmission case in the vehicle front-rear direction and the vehicle left-right direction that divides the internal space of the transmission case into a first space part along a side wall part of the transmission case and a second space part other than the first space part, and that keeps the first space part in a sealed state, the partition part is integrally molded inside the side wall part, and the first space part is formed by the side wall part and the partition part. The oil outlet is provided at an upper portion and a lower portion of the bottom, and a communication chamber forming member is provided at the bottom on the outer surface side of the side wall portion of the transmission case and forms a communication chamber between the side wall portion and the communication chamber forming member, the oil outlet of the upper portion opens at an upper portion of the communication chamber forming member, the oil outlet of the lower portion opens at a lower portion of the communication chamber forming member, and a communication hole that communicates the communication chamber with the internal space of the transmission case is opened at a portion of the side wall portion facing the oil outlet of the lower portion. is.

[0013] According to this configuration, since no lubricating oil enters the sealed first space, even if the transmission case tilts in the longitudinal direction of the vehicle body due to the longitudinal tilt of the vehicle body, and also tilts in the lateral direction of the vehicle body due to the lateral tilt of the vehicle body, and the lubricating oil flows from the side where the oil outlet is located to the opposite side, less lubricating oil accumulates on the opposite side to the side where the oil outlet is located, and more lubricating oil remains in the area where the oil outlet is located, compared to a case where there is no first space. In other words, even if the vehicle body tilts in the longitudinal direction or lateral direction, the oil outlet is less likely to protrude above the oil surface, and lubricating oil can be taken out of the transmission case while making it difficult for air to be sucked in through the oil outlet.

[0014] Since the first space portion of the internal space of the transmission case is partitioned from the second space portion and sealed, a simple measure of just providing a partition portion can be achieved, and there is no need to reduce the outer diameter of the transmission case so as to narrow the internal space of the transmission case on the side opposite the side where the oil outlet of the transmission case is located, and the rigidity of the transmission case can be maintained.

[0015] In the present invention, It is preferable that the gear transmission is provided with a planetary gear device which changes the speed of power from the power source and outputs it, and a clutch which is displaced relative to the planetary gear device towards the side where the side wall portion is located on the side where the oil outlet is located relative to the planetary gear device, and to which the output of the planetary gear device is input, and the first space portion is provided at a location located laterally of the planetary gear device on the side where the planetary gear device is located relative to the clutch.

[0016] According to this configuration, the transmission case is formed in a state in which the side wall portion of the transmission case passes along the lateral outer side of the clutch in the fore-and-aft direction, and the dead space formed on the lateral side of the planetary gear device is utilized as the first space portion, making it easy to provide the first space portion.

[0017] In the present invention, It is preferable that a differential mechanism for transmitting the output of the gear transmission to the traveling device is housed on one end side of the transmission case in the longitudinal direction of the vehicle body.

[0018] According to this configuration, even if the vehicle body tilts in the fore-and-aft direction and the lubricating oil flows toward the opposite side to the side where the oil outlet is located, a larger amount of lubricating oil remains on one end side of the fore-and-aft direction of the transmission case compared to a case where there is no sealed first space portion, so the differential mechanism remains deeply immersed in the lubricating oil, thereby lubricating and cooling the differential mechanism.

[0019] Another work vehicle according to the present invention includes: The vehicle is provided with a gear transmission that changes the speed of power from a power source and outputs it to a traveling device, a transmission case that houses the gear transmission, and an oil outlet that opens in a bottom portion at one end side of the transmission case in the vehicle body longitudinal direction and that takes out lubricating oil from inside the transmission case, and at the other end side of the transmission case in the vehicle body longitudinal direction, an internal space of the transmission case is partitioned into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion, and the first space portion is kept in a sealed state. The bottom portion is provided with a partition portion, the oil outlet is provided at an upper portion and a lower portion of the bottom portion, the bottom portion is provided with a communication chamber forming member provided on the outer surface side of the side wall portion of the transmission case and forming a communication chamber between the side wall portion, the oil outlet of the upper portion opens at an upper portion of the communication chamber forming member, the oil outlet of the lower portion opens at a lower portion of the communication chamber forming member, and a communication hole is opened in a portion of the side wall portion facing the oil outlet of the lower portion, connecting the communication chamber to the internal space of the transmission case.

[0020] According to this configuration, the oil outlet of the lower portion communicates with the internal space of the transmission case via the communication chamber and the communication hole, and the oil outlet of the upper portion communicates with the internal space of the transmission case via the communication chamber and the communication hole. Therefore, while the oil outlet of the upper portion is located at a higher position than the oil outlet of the lower portion, the height position of the location where the oil outlet of the lower portion extracts oil in the internal space of the transmission case can be made the same as the height position of the location where the oil outlet of the upper portion extracts oil in the internal space of the transmission case. Another work vehicle according to the present invention includes: The vehicle is provided with a gear transmission that changes the speed of power from a power source and outputs the power to a traveling device, a transmission case that houses the gear transmission, and an oil outlet that opens in a bottom portion at one end side of the transmission case in the left-right direction of the vehicle body and that takes out lubricating oil from inside the transmission case, and at the other end side of the transmission case in the left-right direction of the vehicle body, an internal space of the transmission case is partitioned into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion, and the first space portion is kept in a sealed state. The bottom portion is provided with a partition portion, the oil outlet is provided at an upper portion and a lower portion of the bottom portion, the bottom portion is provided with a communication chamber forming member provided on the outer surface side of the side wall portion of the transmission case and forming a communication chamber between the side wall portion, the oil outlet of the upper portion opens at an upper portion of the communication chamber forming member, the oil outlet of the lower portion opens at a lower portion of the communication chamber forming member, and a communication hole is opened in a portion of the side wall portion facing the oil outlet of the lower portion, connecting the communication chamber to the internal space of the transmission case. Another work vehicle according to the present invention includes: The vehicle is provided with a gear transmission that changes the speed of power from a power source and outputs the power to a traveling device, a transmission case that houses the gear transmission, and an oil outlet that opens in a bottom portion at one end side of the transmission case in the longitudinal direction and the transverse direction of the vehicle body and that takes out lubricating oil from inside the transmission case, and at the other end side of the transmission case in the longitudinal direction and the transverse direction of the vehicle body, an internal space of the transmission case is partitioned into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion, and The bottom portion is provided with a partition portion that seals the oil outlet, upper and lower portions of the bottom portion are provided with the oil outlet, and the bottom portion is provided with a communication chamber forming member that is provided on the outer surface side of the side wall portion of the transmission case and forms a communication chamber between the side wall portion and the communication chamber forming member, the oil outlet of the upper portion opens at an upper portion of the communication chamber forming member, the oil outlet of the lower portion opens at a lower portion of the communication chamber forming member, and a communication hole that connects the communication chamber to the internal space of the transmission case is opened in a portion of the side wall portion facing the oil outlet of the lower portion. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a side view showing the entire tractor. [Diagram 2] FIG. [Diagram 3] 4 is an explanatory diagram showing the relationship between the speed change state of the continuously variable transmission device, the speed range, and the rotation speed of the output shaft of the stepped transmission portion. FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, with regard to the running body of a tractor (an example of a "work vehicle"), the direction of arrow F shown in Figures 1, 4, 5, etc. is referred to as the "forward direction of the vehicle body," the direction of arrow B as the "rearward direction of the vehicle body," the direction of arrow U as the "upward direction of the vehicle body," the direction of arrow D as the "downward direction of the vehicle body," the direction of arrow L as the "leftward direction of the vehicle body," and the direction of arrow R as the "rightward direction of the vehicle body."

[0023] [Overall configuration of the tractor] As shown in FIG. 1, the tractor's running body has an engine 1, a transmission case 3 whose front part is connected to a flywheel housing 2 provided at the rear of the engine 1, a body frame 5 constituted by a front frame 4 connected to the lower part of the engine 1, a pair of left and right front wheels 6 as running devices provided at the front of the body frame 5 in a steerable and drivable manner, and a pair of left and right rear wheels 7 as running devices provided at the rear of the body frame 5 in a drivable manner. A prime mover 8 having the engine 1 is formed at the front part of the running body. A driver's section 9 is formed at the rear part of the running body. The driver's section 9 is provided with a driver's seat 10, a steering wheel 11 for steering the front wheels 6, and a cabin 12 that covers the riding space. A link mechanism 13 for connecting various working devices such as a rotary tiller (not shown) so that they can be raised and lowered, and a power take-off shaft 14 for transmitting power from the engine 1 to the connected working devices are provided at the rear of the body frame 5.

[0024] [Power transmission device] 2 is a diagram showing a power transmission device 15 that transmits the power of the engine 1 to the front wheels 6, the rear wheels 7, and the power take-off shaft 14. As shown in FIGS. 1 and 2, the power transmission device 15 includes a transmission case 3 whose front part is connected to a flywheel housing 2 provided at the rear of the engine 1. As shown in FIG. 1, the transmission case 3 is provided on the traveling vehicle body in a state in which the front-to-rear direction of the transmission case 3 coincides with the front-to-rear direction of the traveling vehicle body. The transmission case 3 is configured to be separable into a front case part 3a whose front part is connected to the flywheel housing 2, a middle case part 3b whose front part is connected to the rear part of the front case part 3a, and a rear case part 3c whose front part is connected to the rear part of the middle case part 3b.

[0025] As shown in FIG. 2, the transmission case 3 houses a gear transmission 15M that receives power from the engine 1, changes the speed of the input power, and outputs it toward the front wheels 6 and the rear wheels 7, a rear wheel differential mechanism 22, and a work power transmission device 70 that transmits the power from the engine 1 to the power take-off shaft 14.

[0026] As shown in FIG. 2, the gear transmission 15M includes an input shaft 17 to which the power of the output shaft 1a of the engine 1 as a power source is transmitted via a main clutch 16 and which inputs the transmitted power to a transmission case 3, a main transmission section 18 connected to the input shaft 17, a staged transmission section 19 to which the output of the main transmission section 18 is input, a forward / reverse travel switching device 20 to which the output of the staged transmission section 19 is input, a first gear interlocking mechanism 21 that transmits the output of the forward / reverse travel switching device 20 to a rear wheel differential mechanism 22, and a front wheel transmission device 26 to which the output of the forward / reverse travel switching device 20 is transmitted via the first gear interlocking mechanism 21.

[0027] As shown in FIG. 2, the main transmission section 18 includes a planetary gear device 18A and a continuously variable transmission device 18B.

[0028] The planetary gear device 18A includes two planetary gear device sections 50, 60 arranged side by side in the front-rear direction of the transmission case 3. In the following description, the front planetary gear device section 50 of the two planetary gear device sections 50, 60 will be referred to as a first planetary gear device section 50, and the rear planetary gear device section 60 of the two planetary gear device sections 50, 60 will be referred to as a second planetary gear device section 60.

[0029] The first planetary gear unit 50 is provided with a transmission gear (not shown) that meshes with the planet gear 52 of the first planetary gear unit 50, and a connecting member (not shown) is provided across the first planetary gear unit 50 and the second planetary gear unit 60 to interlock and connect the transmission gear and the planet gear 62 of the second planetary gear unit. The carrier 54 of the first planetary gear unit 50 and the carrier 64 of the second planetary gear unit 60 are connected so as to be able to rotate integrally. The planetary gear unit 18A is formed by a compound planetary gear unit.

[0030] The continuously variable transmission 18B is configured by a hydrostatic continuously variable transmission, and is equipped with a variable displacement hydraulic pump P and a hydraulic motor M.

[0031] In the main transmission section 18, the power of the input shaft 17 is input to the hydraulic pump P via the front rotating shaft 31 and the second gear interlocking mechanism 35. In the continuously variable transmission 18B, a speed change operation is performed to change the swash plate angle of the hydraulic pump P, whereby the input power is changed to forward rotation power and reverse rotation power, and the forward rotation power and reverse rotation power are changed in speed continuously, and the changed speed power is output from the hydraulic motor M. The output of the continuously variable transmission 18B is input to the sun gear 51 of the first planetary gear unit 50 via the third gear interlocking mechanism 36. The power of the input shaft 17 is input to the internal gear 53 of the first planetary gear unit 50 via the fourth gear interlocking mechanism 34. In the planetary gear device 18A, the power transmitted from the engine 1 via the continuously variable transmission 18B and the power transmitted from the engine 1 without passing through the continuously variable transmission 18B are combined by the first planetary gear device section 50 and the second planetary gear device section 60, and the combined power is output from the first to third output shafts 37a, 37b, 37c provided on the second planetary gear device section 60.

[0032] [Step-by-step transmission section] As shown in FIG. 2, the staged transmission unit 19 is equipped with four staged clutches CL1 to CL4 to which the composite power from the planetary gear device 18A is input, and an output shaft 38 on which the four staged clutches CL1 to CL4 are provided.

[0033] In the stepped transmission section 19, the continuously variable transmission 18B and the four stepped clutches CL1 to CL4 are appropriately operated so that the composite power from the planetary gear device 18A is stepped into four speed ranges and output from the output shaft 38.

[0034] Fig. 3 is an explanatory diagram showing the relationship between the speed change state of the continuously variable transmission 18B, the speed range, and the rotation speed V of the output shaft 38 of the stepped transmission unit 19. The vertical axis of Fig. 3 shows the rotation speed V of the output shaft 38. The horizontal axis of Fig. 3 shows the speed change state of the continuously variable transmission 18B, with "N" showing the neutral state and "-MAX" showing the maximum speed change state in the reverse rotation direction. "+MAX" showing the maximum speed change state in the forward rotation direction.

[0035] Of the four stage clutches CL1 to CL4, when the first clutch CL1 is engaged and the continuously variable transmission 18B is operated to change speed, the power of the first output shaft 37a is changed in speed by the first-speed gear interlocking mechanism 39a and the first clutch CL1 and output from the output shaft 38. As shown in Fig. 3, the rotation speed of the output shaft 38 becomes the rotation speed of the first speed range, and as the continuously variable transmission 18B is shifted from "-MAX" to "+MAX", the rotation speed V of the output shaft 38 increases steplessly from zero speed [0] to the maximum speed [V1] of the first speed range.

[0036] Of the four stage clutches CL1 to CL4, when the second clutch CL2 is engaged and the continuously variable transmission 18B is operated to change speed, the power of the third output shaft 37c is changed in speed by the second-speed gear interlocking mechanism 39b and the second clutch CL2 and output from the output shaft 38. As shown in Fig. 3, the rotation speed of the output shaft 38 becomes the rotation speed of the second-speed range, which is higher than the first-speed range, and the continuously variable transmission 18B is shifted from "+MAX" toward "-MAX", the rotation speed V of the output shaft 38 increases steplessly from the lowest speed [V1] of the second-speed range to the highest speed [V2] of the second-speed range.

[0037] Of the four stage clutches CL1 to CL4, when the third clutch CL3 is engaged and the continuously variable transmission 18B is operated to change speed, the power of the second output shaft 37b is changed in speed by the third-speed gear interlocking mechanism 39c and the third clutch CL3 and output from the output shaft 38. As shown in Fig. 3, the rotation speed of the output shaft 38 becomes the rotation speed of the third-speed range, which is higher than the second-speed range, and as the continuously variable transmission 18B is shifted from [-MAX] to [+MAX], the rotation speed V of the output shaft 38 increases steplessly from the lowest speed [V2] of the third-speed range to the highest speed [V3] of the third-speed range.

[0038] Of the four stage clutches CL1 to CL4, when the fourth clutch CL4 is engaged and the continuously variable transmission 18B is operated to change speed, the power of the third output shaft 37c is changed in speed by the fourth-speed gear interlocking mechanism 39d and the fourth clutch CL4 and output from the output shaft 38. As shown in Fig. 3, the rotation speed of the output shaft 38 becomes the rotation speed of the fourth-speed range, which is higher than the third-speed range, and as the continuously variable transmission 18B is shifted from "+MAX" toward "-MAX", the rotation speed V of the output shaft 38 increases steplessly from the lowest speed [V3] of the fourth-speed range to the highest speed [V4] of the fourth-speed range.

[0039] [Forward / forward switching device] As shown in Fig. 2, the forward / reverse switching device 20 includes an input shaft 40 connected to the output shaft 38 of the step-by-step transmission unit 19, a forward clutch CLF and a reverse clutch CLR provided on the input shaft 40, and an output shaft 42 connected to the forward clutch CLF via a forward gear mechanism 41f and connected to the reverse clutch CLR via a reverse gear mechanism 41r. As shown in Fig. 2, the reverse gear mechanism 41r includes a reverse gear 46 that meshes with the teeth of the output rotating member of the reverse clutch CLR. The reverse gear 46 is supported on the input shaft 22a of the rear wheel differential mechanism 22 so as to be rotatable relative to the input shaft 22a.

[0040] In the forward / reverse switching device 20, when the forward clutch CLF is engaged, the power transmitted from the staged transmission unit 19 to the input shaft 40 is converted into forward power by the forward clutch CLF and the forward gear mechanism 41f and output from the output shaft 42. When the reverse clutch CLR is engaged, the power transmitted from the staged transmission unit 19 to the input shaft 40 is converted into reverse power by the reverse clutch CLR and the reverse gear mechanism 41r and output from the output shaft 42. The forward power and reverse power output from the output shaft 42 are transmitted to the first gear interlocking mechanism 21, and are transmitted to the input shaft 22a of the rear wheel differential mechanism 22 by the first gear interlocking mechanism 21.

[0041] [Rear wheel differential mechanism] The forward and reverse power output by the forward / reverse switching device 20 is input to an input shaft 22a of the rear wheel differential mechanism 22 via a first gear interlocking mechanism 21, and the rear wheel differential mechanism 22 outputs the input power toward the left and right rear wheels 7. The output of the rear wheel differential mechanism 22 is transmitted to the rear wheels 7 via a reduction gear device 24. The reduction gear device 24 is configured by a planetary gear device. A steering brake 23 is provided in the transmission system from the rear wheel differential mechanism 22 to the rear wheels 7.

[0042] [Front wheel transmission] 2, the front wheel transmission device 26 includes an input shaft 43 to which the forward power and reverse power from the forward / reverse switching device 20 are transmitted via the first gear interlocking mechanism 21, a constant speed clutch CLT and an accelerating clutch CLH provided on the input shaft 43, and an output shaft 45 connected to the constant speed clutch CLT via a constant speed gear mechanism 44a and connected to the accelerating clutch CLH via an accelerating gear mechanism 44b. The parking brake 29 is connected to the input shaft 43.

[0043] In the front wheel transmission device 26, when the constant speed clutch CLT is engaged, the power transmitted from the forward / reverse switching device 20 to the input shaft 43 is transmitted to the output shaft 45 via the constant speed clutch CLT and the constant speed gear mechanism 44a, and then transmitted from the output shaft 45 to the front wheel differential mechanism 28 via the rotating shaft 27. In this case, a state in which the pair of left and right front wheels 6 and the pair of left and right rear wheels 7 are driven with the average peripheral speed of the pair of left and right front wheels 6 and the average peripheral speed of the pair of left and right rear wheels 7 being substantially equal, that is, a so-called front and rear wheel equal speed four-wheel drive state is realized. When the speed-up clutch CLH is engaged, the power transmitted from the forward / reverse switching device 20 to the input shaft 43 is transmitted to the output shaft 45 via the speed-up clutch CLH and the speed-up gear mechanism 44b, and then transmitted from the output shaft 45 to the front wheel differential mechanism 28. In this case, a state in which the pair of left and right front wheels 6 and the pair of left and right rear wheels 7 are driven in a state in which the average peripheral speed of the pair of left and right front wheels 6 is faster than the average peripheral speed of the pair of left and right rear wheels 7, i.e., a so-called four-wheel drive state with front wheel speed increase, is achieved.

[0044] [Working power transmission device] 2, the work power transmission device 70 includes a work clutch 71 that is connected to the input shaft 17 via a front rotating shaft 31 and a rear rotating shaft 32 and receives power from the engine 1, and a work power speed change mechanism 72 that changes the speed of the output of the work clutch 71 and transmits it to the power take-off shaft 14. The front rotating shaft 31 is provided rearward of the input shaft 17 and positioned on the same straight line as the input shaft 17. The rear rotating shaft 32 is provided rearward of the front rotating shaft 31 and positioned on the same straight line as the front rotating shaft 31.

[0045] In the work power transmission device 70, a work clutch 71 is used to switch between a state in which power from the engine 1 is transmitted to the power take-off shaft 14 and a state in which power transmission from the engine 1 to the power take-off shaft 14 is cut off. That is, when the work clutch 71 is switched to the on state, the rear rotating shaft 32 and the work power speed change mechanism 72 are interlocked with each other by the work clutch 71, and power from the input shaft 17 is transmitted to the power take-off shaft 14. When the work clutch 71 is switched to the off state, the interlocked connection between the rear rotating shaft 32 and the work power speed change mechanism 72 is cut off by the work clutch 71, and power transmission from the input shaft 17 to the power take-off shaft 14 is cut off.

[0046] [Oil removal configuration] 2, a power take-off gear 75 is engaged with a transmission gear 35a in a second gear interlocking mechanism 35 that interlocks the front rotating shaft 31 with the hydraulic pump P of the continuously variable transmission 18B, and a first hydraulic pump 76, a second hydraulic pump 77, and a third hydraulic pump 78 are connected to the power take-off gear 75. As shown in FIGS. 4 and 5, the first hydraulic pump 76, the second hydraulic pump 77, and the third hydraulic pump 78 are supported on the upper lateral parts of the transmission case 3.

[0047] The first hydraulic pump 76 is configured to be driven by the power that the power take-off gear 75 takes out from the second gear interlocking mechanism 35, take out the lubricating oil stored inside the transmission case 3, and supply the taken lubricating oil as hydraulic oil to the continuously variable transmission 18B via a first oil feed pipe member 81 extending from the first hydraulic pump 76. The second hydraulic pump 77 is configured to be driven by the power that the power take-off gear 75 takes out from the second gear interlocking mechanism 35, take out the lubricating oil stored inside the transmission case 3, and supply the taken lubricating oil as hydraulic oil for the main transmission section 18 and the forward / reverse switching device 20 via a second oil feed pipe member 82 extending from the second hydraulic pump 77 and a priority switching valve 83. The priority switching valves 83 are provided on both sides of the transmission case 3. The third hydraulic pump 78 is driven by the power that the power take-off gear 75 takes from the second gear interlocking mechanism 35, and takes out the lubricating oil stored inside the transmission case 3. The taken lubricating oil is sent to the lubrication relief valve device 85 via a third oil supply pipe member 84 extending from the third hydraulic pump 78, and is then sent into the transmission case 3 as lubricating oil.

[0048] An oil outlet that enables the first hydraulic pump 76, the second hydraulic pump 77, and the third hydraulic pump 78 to extract oil from the transmission case 3 is opened at the bottom of one end of the transmission case 3 in the longitudinal direction and the transverse direction of the vehicle body, but at the other end of the transmission case 3 in the longitudinal direction and the transverse direction of the vehicle body (the opposite side to the side where the oil outlet is located), the volume of the portion where lubricating oil remains inside the transmission case 3 is configured to be smaller than the volume of the internal space of the transmission case 3. This prevents the transmission case 3 from being tilted downwards at the other end in the longitudinal direction of the vehicle body (the opposite side to the side where the oil outlet is located) due to the longitudinal inclination of the traveling vehicle body, and reduces the internal space of the transmission case 3. Even if the lubricating oil located inside the transmission case 3 flows from one end side of the transmission case 3 in the fore-and-aft direction of the vehicle body to the other end side in the fore-and-aft direction of the vehicle body, or even if the transmission case 3 becomes inclined with the other end side in the left-and-aft direction of the vehicle body (the side opposite the side where the oil outlet is located) lowered due to the left-and-right tilt of the traveling vehicle body, and the lubricating oil located inside the transmission case 3 flows from one end side of the transmission case 3 in the left-and-aft direction of the vehicle body to the other end side in the left-and-aft direction of the vehicle body., the amount of lubricating oil remaining in the part of the transmission case 3 where the oil outlet is located increases, so that the oil outlet does not rise above the oil surface, and the first hydraulic pump 76, the second hydraulic pump 77 and the third hydraulic pump 78 are prevented from sucking air from the oil outlet.

[0049] In this embodiment, as shown in FIG. 5, an oil outlet 90 is formed on the right side of the rear end of the transmission case 3. The oil outlet 90 is formed in a portion of the transmission case 3 that is forward of the rear axle case 7a (see FIG. 4) extending from the transmission case 3. As shown in FIGS. 5 and 6, a first oil outlet 91, a second oil outlet 92, and a third oil outlet 93 for taking out lubricating oil from inside the transmission case 3 are opened in the bottom 3e of the transmission case 3 in the oil outlet 90. The first oil outlet 91 and the first hydraulic pump 76 are connected via a first suction pipe member 86. The second oil outlet 92 and the second hydraulic pump 77 are connected via a second suction pipe member 87. The third oil outlet 93 and the third hydraulic pump 78 are connected via a third suction pipe member 88. The first oil outlet 91, the second oil outlet 92 and the third oil outlet 93 are open to the bottom 3e of the transmission case 3 at the oil outlet portion 90.

[0050] In this embodiment, as shown in FIGS. 6 and 7, the first oil outlet 91 and the third oil outlet 93 are provided in a lower portion of the bottom 3e, and the second oil outlet 92 is provided in an upper portion of the bottom 3e.

[0051] The bottom 3e is provided with a communication chamber forming member 94 attached to the outer surface side of the right side wall portion 3d of the transmission case 3. The communication chamber forming member 94 is attached to the right side wall portion 3d in a state where it closes the recessed space provided in the right side wall portion 3d, and a communication chamber 95 located between the communication chamber forming member 94 and the right side wall portion 3d is formed by the communication chamber forming member 94 and the right side wall portion 3d. The first oil outlet 91 and the third oil outlet 93 are opened at the lower part of the communication chamber forming member 94 in a state where they are aligned in the vehicle front-rear direction. The second oil outlet 92 is opened at the upper part of the communication chamber forming member 94. The second oil outlet 92 is located at a higher position than the first oil outlet 91 and the third oil outlet 93. The first oil outlet 91, the second oil outlet 92, and the third oil outlet 93 are communicated with the communication chamber 95. A first communication hole 96 that communicates the communication chamber 95 with the internal space 3f of the transmission case 3 is opened at a portion of the right side wall portion 3d facing the first oil outlet 91. A second communication hole 97 that communicates the communication chamber 95 with the internal space 3f of the transmission case 3 is opened at a portion of the right side wall portion 3d facing the third oil outlet 93. A first strainer 98 is provided in the first communication hole 96, and a second strainer 99 is provided in the second communication hole 97.

[0052] The first oil outlet 91 communicates with the internal space 3f of the mission case 3 via the communication chamber 95, the first communication hole 96, the first strainer 98, the second communication hole 97, and the second strainer 99. The second oil outlet 92 communicates with the internal space 3f of the mission case 3 via the communication chamber 95, the first communication hole 96, the first strainer 98, the second communication hole 97, and the second strainer 99. The third oil outlet 93 communicates with the internal space 3f of the mission case 3 via the communication chamber 95, the second communication hole 97, the second strainer 99, the first communication hole 96, and the first strainer 98.

[0053] The first suction pipe member 86 is connected to the first oil outlet 91 by inserting an end of the first suction pipe member 86 into the first oil outlet 91. The lubricating oil is taken out by the first suction pipe member 86 mainly via the first oil outlet 91, the communication chamber 95, the first communication hole 96, and the first strainer 98. The lubricating oil can also be taken out by the first suction pipe member 86 via the first oil outlet 91, the communication chamber 95, the second communication hole 97, and the second strainer 99.

[0054] The third suction pipe member 88 is connected to the third oil outlet 93 by inserting an end of the third suction pipe member 88 into the third oil outlet 93. The lubricating oil is taken out by the third suction pipe member 88 mainly via the third oil outlet 93, the communication chamber 95, the second communication hole 97, and the second strainer 99. The lubricating oil can also be taken out by the third suction pipe member 88 via the third oil outlet 93, the communication chamber 95, the first communication hole 96, and the first strainer 98.

[0055] The second suction pipe member 87 and the second oil outlet 92 are connected by inserting an end of the second suction pipe member 87 into the second oil outlet 92. The second suction pipe member 87 takes out the lubricating oil via the second oil outlet 92, the communication chamber 95, the first communication hole 96, the first strainer 98, the second communication hole 97, and the second strainer 99. The second oil outlet 92 is located at a higher position than the first oil outlet 91 and the third oil outlet 93, but the height position of the location where the second oil outlet 92 takes out the lubricating oil inside the transmission case 3 is the same as the height position of the location where the first oil outlet 91 and the third oil outlet 93 take out the lubricating oil inside the transmission case 3.

[0056] In this embodiment, the front end side of the transmission case 3 (the opposite side to the side where the first to third oil outlets 91, 92, 93 are located in the fore-and-aft direction of the vehicle body) and the left end side of the transmission case 3 (the opposite side to the side where the first to third oil outlets 91, 92, 93 are located in the left-right direction of the vehicle body) are configured so that the volume of the portion where lubricating oil accumulates inside the transmission case 3 is smaller than the volume of the internal space of the transmission case 3.

[0057] Specifically, as shown in Figs. 4 and 8, a partition 100 is provided inside the transmission case 3 at a portion on the front end side of the transmission case 3, i.e., a portion located further forward of the oil extraction portion 90, and the partition 100 divides the internal space 3f of the transmission case 3 into a first space A1 along the left side wall portion 3g of the transmission case 3 and a second space A2 other than the first space A1. The first space A1 is sealed by the partition 100 and the left side wall portion 3g so that the lubricating oil stored inside the transmission case 3 does not enter. The volume in which the lubricating oil can remain inside the transmission case 3 at the portion on the front end side of the transmission case 3, i.e., the portion located further forward of the oil extraction portion 90, is smaller than the volume of the internal space 3f at the portion on the front end side of the transmission case 3 by the volume of the first space A1.

[0058] As shown in FIG. 8, the left side wall portion 3g and the partition portion 100 are provided with an opening 101 that enables the partition portion 100 to be integrally cast with the transmission case 3, and a blocking member 102 that blocks the opening 101 so that the first space portion S1 is sealed.

[0059] The lubricating oil is preferably stored in the internal space 3f of the transmission case 3 to lubricate the gear transmission 15M, the rear wheel differential mechanism 22, etc., in a state in which the height position of the oil level S of the lubricating oil is the same as the height position between the rotation axis of the ring gear 22b of the rear wheel differential mechanism 22 and the lower end of the ring gear 22b. The upper end T of the first space portion A1 is located above the oil level S.

[0060] Even if the transmission case 3 is inclined so that the front end thereof is downward in the fore-and-aft direction of the vehicle body and the lubricating oil located inside the transmission case 3 flows from the rear end side of the transmission case 3 (the side where the first to third oil outlets 91, 92, 93 are located) toward the front end side of the transmission case 3 (the side opposite to the side where the first to third oil outlets 91, 92, 93 are located), the amount of lubricating oil that accumulates at the front end side of the transmission case 3 is less and the amount of lubricating oil remaining at the rear end side of the transmission case 3 is greater than in a case where the first space portion A1 does not exist, and the first oil outlet 91, the second oil outlet 92 and the third oil outlet 93 remain submerged in lubricating oil.

[0061] Even if the transmission case 3 is inclined so that the left end side in the left-right direction of the vehicle body is downward, and the lubricating oil located inside the transmission case 3 flows from the right end side of the transmission case 3 (the side where the first to third oil outlets 91, 92, 93 are located) toward the left end side of the transmission case 3 (the opposite side to the side where the first to third oil outlets 91, 92, 93 are located), the amount of lubricating oil that accumulates on the left end side of the transmission case 3 is less and the amount of lubricating oil remaining on the right end side of the transmission case 3 is greater than in a case where the first space portion A1 does not exist, and the first oil outlet 91, the second oil outlet 92 and the third oil outlet 93 remain filled with lubricating oil.

[0062] In this embodiment, as shown in Figs. 4 and 8, the first to fourth stage clutches CL1, CL2, CL3, and CL4 provided in the stage transmission section 19 and receiving the output of the planetary gear device 18A are displaced toward the left side wall 3g relative to the planetary gear device 18A on the side where the first to third oil outlets 91, 92, and 93 are located. The first space A1 is provided on the lateral side of the planetary gear device 18A on the side where the planetary gear device 18A is located relative to the first to fourth stage clutches CL1, CL2, CL3, and CL4. The first space A1 is provided by utilizing the dead space between the planetary gear device 18A and the left side wall 3g as an installation space for the first space A1.

[0063] [Another embodiment] (1) In the above embodiment, the oil outlets (first oil outlet 91, second oil outlet 92, and third oil outlet 93) are provided at the rear end in the vehicle longitudinal direction and at the right end in the vehicle transverse direction, and the first space portion A1 is provided at the front end in the vehicle longitudinal direction and at the left end in the vehicle transverse direction, but this is not limited to the above. The oil outlets (first oil outlet 91, second oil outlet 92, and third oil outlet 93) may be provided at the front end in the vehicle longitudinal direction and at the left end in the vehicle transverse direction, and the first space portion A1 may be provided at the rear end in the vehicle longitudinal direction and at the right end in the vehicle transverse direction. Also, the oil outlets (first oil outlet 91, second oil outlet 92, and third oil outlet 93) may be provided in a state where they are located at one end side (front end side or rear end side) only in the vehicle body front-rear direction of the vehicle body front-rear direction and the vehicle body left-right direction, and the first space portion A1 may be provided in a state where they are located at the other end side (rear end side or front end side) only in the vehicle body front-rear direction of the vehicle body front-rear direction and the vehicle body left-right direction. Also, the oil outlets (first oil outlet 91, second oil outlet 92, and third oil outlet 93) may be provided in a state where they are located at one end side (left end side or right end side) only in the vehicle body left-right direction of the vehicle body front-rear direction and the vehicle body left-right direction, and the first space portion A1 may be provided in a state where they are located at the other end side (right end side or left end side) only in the vehicle body left-right direction of the vehicle body front-rear direction and the vehicle body left-right direction.

[0064] (2) In the above embodiment, the first space A1 is provided on the lateral side of the planetary gear unit 18A. However, the present invention is not limited to this and may be provided in any location.

[0065] (3) In the above embodiment, an example was shown in which three oil outlets 91, 92, 93 were provided, but two or less, or four or more oil outlets may be provided.

[0066] (4) In the above embodiment, an example was shown in which the communication chamber 95 was provided, but the communication chamber 95 may not be provided and the oil outlet may be opened directly to the side wall portion.

[0067] (5) In the above embodiment, an example was shown in which the front wheels 6 and rear wheels 7 were used as running devices. However, instead of the front and rear wheels, a crawler-type running device, or a running device that combines wheels and mini crawlers, may also be used.

[0068] (6) In the above embodiment, an example was shown in which the engine 1 was provided. However, the power source may be an electric motor alone, or an engine and an electric motor. [Industrial Applicability]

[0069] The present invention can be applied to a work vehicle having an oil outlet that opens at the bottom of one end side in the vehicle body longitudinal direction of a transmission case that houses a gear transmission and that allows lubricating oil to be taken out from inside the transmission case. [Explanation of symbols]

[0070] 1 Engine (power source) 3. Transmission case 3d Right side wall (side wall) 3e bottom 3f interior space 3g Left side wall (side wall) 6 Front wheels (running gear) 7 Rear wheels (running gear) 15M gear transmission 18A Planetary Gear Unit 22 Rear wheel differential mechanism (differential mechanism) 91 First oil outlet (lower oil outlet) 92 Second oil outlet (upper oil outlet) 93 Third oil outlet (lower oil outlet) 94 Communication chamber forming member 95 Communication room 96 1st communication hole (communication hole) 97 2nd communication hole (communication hole) 100 Partition A1 1st space A2 2nd space CL1 Staged clutch (clutch) CL2 Staged clutch (clutch) CL3 Staged Clutch (Clutch) CL4 Staged Clutch (Clutch)

Claims

1. a gear transmission that changes the speed of the power from the power source and outputs it to the traveling device; a transmission case that houses the gear transmission; an oil outlet opening at a bottom portion of one end of the transmission case in the vehicle front-rear direction, for taking out lubricating oil from inside the transmission case; a partition portion is provided at the other end side of the transmission case in the vehicle body front-rear direction, the partition portion partitioning an internal space of the transmission case into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion, and sealing the first space portion, The partition portion is integrally formed inside the side wall portion, The first space is formed by the side wall and the partition, The oil outlet is provided at an upper portion and a lower portion of the bottom, a communication chamber forming member provided on the bottom portion and disposed on an outer surface side of the side wall portion of the transmission case to form a communication chamber between the side wall portion and the communication chamber forming member, The oil outlet of the upper portion is opened to an upper portion of the communication chamber forming member, The oil outlet of the lower portion is opened to a lower portion of the communication chamber forming member, A communication hole that communicates the communication chamber with the internal space of the transmission case is opened in a portion of the side wall portion facing the oil outlet port in the lower portion.

2. a gear transmission that changes the speed of the power from the power source and outputs it to the traveling device; a transmission case that houses the gear transmission; an oil outlet opening at a bottom portion of one end of the transmission case in the left-right direction of the vehicle body, for taking out lubricating oil from inside the transmission case; a partition portion is provided at the other end side of the transmission case in the left-right direction of the vehicle body, the partition portion dividing an internal space of the transmission case into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion, and sealing the first space portion, The partition portion is integrally formed inside the side wall portion, The first space is formed by the side wall and the partition, The oil outlet is provided at an upper portion and a lower portion of the bottom, a communication chamber forming member provided on the bottom portion and disposed on an outer surface side of the side wall portion of the transmission case to form a communication chamber between the side wall portion and the communication chamber forming member, The oil outlet of the upper portion is opened to an upper portion of the communication chamber forming member, The oil outlet of the lower portion is opened to a lower portion of the communication chamber forming member, A communication hole that communicates the communication chamber with the internal space of the transmission case is opened in a portion of the side wall portion facing the oil outlet port in the lower portion.

3. a gear transmission that changes the speed of the power from the power source and outputs it to the traveling device; a transmission case that houses the gear transmission; an oil outlet that opens at a bottom portion of one end side of the transmission case in the vehicle front-rear direction and the vehicle left-right direction and that takes out lubricating oil from inside the transmission case; a partition portion is provided at the other end side of the transmission case in the vehicle body longitudinal direction and the vehicle body transverse direction, the partition portion partitioning an internal space of the transmission case into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion, and sealing the first space portion, The partition portion is integrally formed inside the side wall portion, The first space is formed by the side wall and the partition, The oil outlet is provided at an upper portion and a lower portion of the bottom, a communication chamber forming member provided on the bottom portion and disposed on an outer surface side of the side wall portion of the transmission case to form a communication chamber between the side wall portion and the communication chamber forming member, The oil outlet of the upper portion is opened to an upper portion of the communication chamber forming member, The oil outlet of the lower portion is opened to a lower portion of the communication chamber forming member, A communication hole that communicates the communication chamber with the internal space of the transmission case is opened in a portion of the side wall portion facing the oil outlet port in the lower portion.

4. the gear transmission is provided with a planetary gear device which changes the speed of power from the power source and outputs the power, and a clutch which is provided on a side of the planetary gear device on which the oil outlet is located and displaced toward a side on which the side wall portion is located with respect to the planetary gear device, and to which an output of the planetary gear device is input, 4. The work vehicle according to claim 1, wherein the first space is provided at a location laterally of the planetary gear device on a side of the clutch on which the planetary gear device is located.

5. 5. The work vehicle according to claim 1, wherein a differential mechanism for transmitting an output of the gear transmission to the traveling device is housed in one end side of the transmission case in the vehicle body longitudinal direction.

6. a gear transmission that changes the speed of the power from the power source and outputs it to the traveling device; a transmission case that houses the gear transmission; an oil outlet opening at a bottom portion of one end of the transmission case in the vehicle front-rear direction, for taking out lubricating oil from inside the transmission case; a partition portion is provided at the other end side of the transmission case in the vehicle body front-rear direction, the partition portion partitioning an internal space of the transmission case into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion, and sealing the first space portion, The oil outlet is provided at an upper portion and a lower portion of the bottom, a communication chamber forming member provided on the bottom portion and disposed on an outer surface side of the side wall portion of the transmission case to form a communication chamber between the side wall portion and the communication chamber forming member, The oil outlet of the upper portion is opened to an upper portion of the communication chamber forming member, The oil outlet of the lower portion is opened to a lower portion of the communication chamber forming member, A communication hole that communicates the communication chamber with the internal space of the transmission case is opened in a portion of the side wall portion facing the oil outlet port in the lower portion.

7. a gear transmission that changes the speed of the power from the power source and outputs it to the traveling device; a transmission case that houses the gear transmission; an oil outlet opening at a bottom portion of one end of the transmission case in the left-right direction of the vehicle body, for taking out lubricating oil from inside the transmission case; a partition portion is provided at the other end side of the transmission case in the left-right direction of the vehicle body, the partition portion dividing an internal space of the transmission case into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion, and sealing the first space portion, The oil outlet is provided at an upper portion and a lower portion of the bottom, a communication chamber forming member provided on the bottom portion and disposed on an outer surface side of the side wall portion of the transmission case to form a communication chamber between the side wall portion and the communication chamber forming member, The oil outlet of the upper portion is opened to an upper portion of the communication chamber forming member, The oil outlet of the lower portion is opened to a lower portion of the communication chamber forming member, A communication hole that communicates the communication chamber with the internal space of the transmission case is opened in a portion of the side wall portion facing the oil outlet port in the lower portion.

8. a gear transmission that changes the speed of the power from the power source and outputs it to the traveling device; a transmission case that houses the gear transmission; an oil outlet that opens at a bottom portion of one end side of the transmission case in the vehicle front-rear direction and the vehicle left-right direction and that takes out lubricating oil from inside the transmission case; a partition portion is provided at the other end side of the transmission case in the vehicle body longitudinal direction and the vehicle body transverse direction, the partition portion partitioning an internal space of the transmission case into a first space portion along a side wall portion of the transmission case and a second space portion other than the first space portion, and sealing the first space portion, The oil outlet is provided at an upper portion and a lower portion of the bottom, a communication chamber forming member provided on the bottom portion and disposed on an outer surface side of the side wall portion of the transmission case to form a communication chamber between the side wall portion and the communication chamber forming member, The oil outlet of the upper portion is opened to an upper portion of the communication chamber forming member, The oil outlet of the lower portion is opened to a lower portion of the communication chamber forming member, A communication hole that communicates the communication chamber with the internal space of the transmission case is opened in a portion of the side wall portion facing the oil outlet port in the lower portion.

Images