Work vehicle

Abstract

The work vehicle of the present application is provided with a wheel drive case extending in the width direction of the vehicle body, and wheels supported in a drivable manner to the lateral two ends of the wheel drive case, and aims to prevent clogging of the exhaust portion by lubricating oil while simplifying the countermeasure structure for preventing clogging due to lubricating oil stored in the wheel drive case. The work vehicle of the present application is provided with a cylindrical portion (21) provided projecting from the wheel drive case (14) to the outside of the wheel drive case (14) for the input shaft (19) of the wheel drive case (14) to pass through. The cylindrical portion (21) is provided projecting in an inclined state where the further the projection end side, the higher the position. The exhaust portion (27) of the wheel drive case (14) is opened to the inside of the cylindrical portion (21) at a position in the peripheral wall of the cylindrical portion (21) that is higher than the center (X) in the up-down direction of the wheel drive case (14).

Description

Technical Field

[0001] This invention relates to a work vehicle. Background Technology

[0002] [Background Technology 1]

[0003] The work vehicle includes: a wheel drive box supported on the traveling body extending along the width of the machine body; and wheels supported on the two lateral ends of the wheel drive box in a driveable manner. For example, there is the riding-type rice transplanter shown in Patent Document 1. In the riding-type rice transplanter shown in Patent Document 1, a rear axle box serves as the wheel drive box, and rear wheels serve as the wheels.

[0004] In the aforementioned work vehicle, if an exhaust section is provided that vents air from inside the wheel drive box to the outside, the exhaust section will become blocked if lubricating oil stored inside the wheel drive box enters the exhaust section.

[0005] [Background Technology 2]

[0006] The work vehicle includes: a wheel drive housing supported on the traveling body in a state extending along the width direction of the machine body; wheels supported at the two lateral ends of the wheel drive housing; and a gear mechanism housed in the middle part of the wheel drive housing in the width direction of the machine body, transmitting power to the wheels at the two lateral ends. For example, a riding-type rice transplanter as shown in Patent Document 1 is such a work vehicle. In the riding-type rice transplanter shown in Patent Document 1, a rear axle box serving as the wheel drive housing and rear wheels serving as the wheels are included, along with a gear mechanism having a bevel gear fixed to the input shaft and a bevel gear fixed to the transmission shaft.

[0007] In the aforementioned work vehicle, when an exhaust section is provided at the transverse end of the wheel drive housing to allow air to escape from the inside of the wheel drive housing to the outside, mud splashed up by the wheels can enter the air outlet of the exhaust section and cause blockage. Even if an exhaust section is provided in the middle of the wheel drive housing to prevent blockage caused by mud splashed up by the wheels, the exhaust section can still be blocked if lubricating oil stored inside the wheel drive housing is splashed into the exhaust section due to the agitation of the rotating gears of the gear mechanism.

[0008] Existing technical documents

[0009] Patent documents

[0010] Patent Document 1: Japanese Patent Application Publication No. 2013-203359 Summary of the Invention

[0011] The problem that the invention aims to solve

[0012] [Technical Issue 1]

[0013] The technical problem corresponding to background technology 1 is as follows.

[0014] The present invention provides a work vehicle that simplifies the response structure to prevent blockage caused by lubricating oil stored in the wheel drive box, while preventing blockage of the exhaust section caused by lubricating oil.

[0015] [Technical Issue 2]

[0016] The technical problem corresponding to background technology 2 is as follows.

[0017] The present invention provides a work vehicle that can prevent the exhaust from being blocked by mud splashed by the wheels and lubricating oil splashed by the gears, and simplifies the anti-blocking structure.

[0018] Solution for solving the problem

[0019] [Option 1]

[0020] The solution corresponding to technical problem 1 is as follows.

[0021] The work vehicle of the present invention comprises: a wheel drive housing supported on a traveling body extending in the width direction of the body; wheels supported at the two lateral ends of the wheel drive housing in a driveable manner; an input shaft protruding from the wheel drive housing to the outside of the wheel drive housing and inputting power to the wheel drive housing; a cylinder protruding from the wheel drive housing to the outside of the wheel drive housing for insertion of the input shaft; and an exhaust section for exhausting air from the inside of the wheel drive housing to the outside. The cylinder protrudes in an inclined state, with the position increasing towards the protruding end. The exhaust section communicates with the inside of the cylinder. The opening of the exhaust section in the cylinder is located in the peripheral wall of the cylinder at a position higher than the center in the vertical direction of the wheel drive housing.

[0022] According to this structure, compared to a wheel drive housing that requires a connecting part to support the wheel drive housing on the machine body, making it difficult to ensure sufficient empty space, the cylinder portion protruding from the wheel drive housing makes it easier to install the exhaust section. Furthermore, since the cylinder portion protrudes from the wheel drive housing at an inclined state, with the position increasing towards the protruding end, it is easier to ensure that the opening of the exhaust section in the cylinder portion is higher than the center position in the vertical direction of the wheel drive housing. If the amount of lubricating oil stored in the wheel drive housing is stored in the wheel drive housing such that the oil level is the same as the center position in the vertical direction of the wheel drive housing, the amount of lubricating oil pre-stored in the wheel drive housing is sufficient. Lubricating oil is less likely to enter the exhaust section opening, which is located at a position higher than the required amount of lubricating oil. Therefore, the following simple structure can be used as an anti-clogging structure to prevent blockage of the exhaust section due to lubricating oil: the cylinder portion protrudes from the wheel drive housing at an inclined state, with the position increasing towards the protruding end, and the exhaust section opening into the cylinder portion at a position higher than the center position in the vertical direction of the wheel drive housing.

[0023] Preferably, in this invention, the input shaft and the cylindrical portion protrude from the middle portion of the traveling body of the wheel drive box in the width direction.

[0024] According to this structure, the exhaust section can be easily positioned laterally inward of the engine body, away from the wheels, thus making it difficult for mud splashed up by the wheels to enter the air outlet of the exhaust section.

[0025] Preferably, in this invention, the exhaust portion includes: a through hole disposed on the peripheral wall; and a bendable pipe portion communicating with the through hole.

[0026] According to this structure, even if there are components such as a transmission system near the cylinder, the exhaust section can be equipped in a state where it bypasses the components by bending the tube, thus making it easy to position the air outlet of the exhaust section at the desired location.

[0027] Preferably, the wheel drive box of the present invention comprises: a middle box portion extending along the width direction of the body and having the cylindrical portion; and a transverse box portion disposed along the vertical direction of the body, extending downward from both ends of the middle box portion in the width direction of the body, and supporting the wheel at its lower part.

[0028] According to this structure, the wheels are supported at a position lower than the middle box section, thus increasing the ground clearance of the middle box section and raising the minimum ground clearance of the machine body.

[0029] Preferably, the present invention comprises: a gearbox disposed on the side of the cylinder relative to the wheel drive box in a state that is away from the wheel drive box in the longitudinal direction of the machine body; an output shaft that protrudes from the gearbox toward the side of the wheel drive box and is located at a position higher than the input shaft; and a rotating shaft that links the input shaft and the output shaft together, wherein the input shaft protrudes from the wheel drive box in an inclined state that is located at a higher position as it approaches the protruding end.

[0030] According to this structure, the rotating shaft connects the input shaft and the output shaft in an inclined state that is higher the closer to the output shaft. Compared with the input shaft being set in a horizontal position protruding from the wheel drive box, the tilt angle of the rotating shaft can be reduced.

[0031] Preferably, the present invention includes: a universal joint connecting the rotating shaft and the output shaft, and a connecting member having a spline hole externally fitted into the spline shaft portion of the rotating shaft and the spline shaft portion of the input shaft, connecting the rotating shaft and the input shaft.

[0032] According to this structure, the rotating shaft and the input shaft are connected by a connecting component that is simpler than a universal joint, thus enabling power to be transmitted from the output shaft to the input shaft through an inexpensive power transmission structure.

[0033] [Option 2]

[0034] The solution corresponding to technical problem 2 is as follows.

[0035] The work vehicle of the present invention comprises: a wheel drive housing supported on a traveling body extending in the width direction of the body; wheels supported at the two transverse ends of the wheel drive housing; a gear mechanism housed in the middle portion of the wheel drive housing in the width direction of the body, transmitting power to the wheels at the two transverse ends; a cylindrical portion protruding from the middle portion of the wheel drive housing to the outside of the wheel drive housing, through which the input shaft of the gear mechanism passes; a bearing externally embedded in the input shaft and internally embedded in the cylindrical portion, disposed between the cylindrical portion and the input shaft; and an exhaust portion venting exhaust from the inside of the wheel drive housing to the outside, the exhaust portion communicating with the inside of the cylindrical portion, the opening of the exhaust portion in the cylindrical portion being disposed in a portion of the cylindrical portion located on the protruding end side of the cylindrical portion closer to the bearing.

[0036] According to this structure, compared to having an exhaust section at the end of the wheel drive housing in the width direction, it is easier to position the air outlet of the exhaust section away from the wheel in the width direction of the housing. Therefore, even if mud is splashed by the wheel, it is difficult for it to enter the air outlet, thus preventing blockage of the exhaust section due to mud splashed by the wheel. Even if the lubricating oil stored inside the wheel drive housing splashes out due to the agitation of the gears in the gear mechanism, it will come into contact with the bearing. The bearing prevents the splashed lubricating oil from entering the opening of the cylinder of the exhaust section, thus preventing blockage of the exhaust section due to lubricating oil splashed by the gears.

[0037] The bearing that allows the input shaft to rotate smoothly relative to the cylinder is used as a component to prevent lubricating oil from entering the vent. Therefore, a structure that prevents the vent from being blocked by lubricating oil can be achieved simply by opening the vent inside the cylinder at a position that is closer to the protruding end of the cylinder than the bearing.

[0038] Preferably, in this invention, a second bearing is provided between the portion of the cylindrical portion located on the side of the protruding end closer to the portion where the opening is located and the input shaft, the bearing being externally embedded in the input shaft and internally embedded in the cylindrical portion.

[0039] According to this structure, the second bearing prevents mud and water from entering the opening in the exhaust section from the outside of the cylinder. Therefore, the second bearing, which allows the input shaft to rotate smoothly relative to the cylinder, can be used to simplify the anti-clogging structure of the exhaust section while preventing blockage of the exhaust section due to mud and water.

[0040] Preferably, the exhaust section of the present invention has a bendable pipe section.

[0041] According to this structure, even if there are components such as a transmission system near the cylinder, the exhaust section can be equipped in a state where it bypasses the components by bending the tube, thus making it easy to position the air outlet of the exhaust section at the desired location.

[0042] Preferably, the wheel drive box of the present invention comprises: a middle box portion extending along the width direction of the body and having the cylindrical portion; and a transverse box portion disposed along the vertical direction of the body, extending downward from both ends of the middle box portion in the width direction of the body, supporting the wheel at its lower part, and having an oil supply port for supplying lubricating oil to the interior of the wheel drive box disposed at at least one of the transverse box portions at both ends in a position higher than the center of the middle box portion in the vertical direction of the body.

[0043] According to this structure, lubricating oil of an amount sufficient to pre-store the amount of oil in the wheel drive box can be supplied from at least one of the transverse box portions, that is, an amount of lubricating oil such that the oil level of the lubricating oil stored in the wheel drive box is at the same position as the center of the wheel drive box.

[0044] Preferably, in this invention, the oil supply port is located on both sides of the transverse box portion at both ends.

[0045] According to this structure, even when obstacles such as walls are located on one side of the machine body, the oil supply port on the side opposite to the side where the obstacle is located can be used, thus making it easy to replenish lubricating oil. When there are no obstacles on either side of the machine body, the oil supply ports on both the left and right sides of the side chambers can be used, thus allowing for rapid replenishment of lubricating oil.

[0046] Preferably, in this invention, the wheel drive box is located at the rear of the driving body, and the oil supply port is located in the outer periphery of the transverse box portion facing the rear of the body.

[0047] According to this structure, the oil supply port faces the empty space behind the wheel drive box, making it easy to inject lubricating oil into the oil supply port. Attached Figure Description

[0048] Figure 1 This is a left view showing the overall configuration of a ride-on rice transplanter.

[0049] Figure 2 This is the front view showing the wheel drive box.

[0050] Figure 3 This is a rear view of the wheel drive box.

[0051] Figure 4 It is a side view showing the gear mechanism, input shaft, and exhaust section.

[0052] Figure 5 This is the left view showing the oil supply port.

[0053] Figure 6 This is a left view showing an exhaust section with other implementations.

[0054] Explanation of reference numerals in the attached figures

[0055] 2: Rear wheel; 3: Motor body; 6: Driver's seat; 13: Gearbox (front gearbox); 13a: Output shaft; 14: Wheel drive box; 14A: Middle box section; 14B: Transverse box section; 15: Rotating shaft; 15a: Universal joint; 15b: Connecting component; 15s: Splined shaft section; 19: Input shaft; 19s: Splined shaft section; 20: Gear mechanism; 21: Cylindrical section; 22a: Bearing (first bearing); 22b: Second bearing; 27: Exhaust section; 27a: Opening; 28: Through hole; 29: Pipe section; 30: Oil supply port; X: Center. Detailed Implementation

[0056] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0057] It should be noted that in the following description, the traveling body of the riding-type rice transplanter (an example of a "work vehicle") will be... Figure 1 , Figure 4 The arrow F shown is positioned "front of the aircraft", arrow B is positioned "rear of the aircraft", arrow U is positioned "above the aircraft", and arrow D is positioned "below the aircraft". Figure 1 , Figure 4 Set the direction of the front side of the paper to "left side of the machine" and the direction of the inside side of the paper to "right side of the machine".

[0058] [The complete ride-on rice transplanter]

[0059] like Figure 1 As shown, the riding-type rice transplanter includes: a traveling body 3, having a pair of front wheels 1 on the left and right and a pair of rear wheels 2 on the left and right. A power unit 5 with an engine 4 is formed at the front of the traveling body 3. At the rear of the traveling body 3 is a driver's unit 8, having a driver's seat 6 and a steering wheel 7 for steering the front wheels 1. A seedling planting device 9 is connected to the rear of the traveling body 3. The connection between the seedling planting device 9 and the traveling body 3 is via a linkage mechanism 11 extending rearward from the body frame 10 in a vertically swinging manner. The linkage mechanism 11 is swung by the extension and retraction of the lifting cylinder 12, thereby raising and lowering the seedling planting device 9 between a lowered working state where the ground float 9a is in contact with the farmland surface and a non-working state where the ground float 9a is upward away from the farmland surface. The seedling planting device 9 has six seedling planting mechanisms 9b arranged in the width direction of the traveling body 3, configured to plant seedlings in six rows.

[0060] A pair of left and right front wheels 1 are supported at the front of the chassis frame 10 via a front gearbox 13 that enables them to be steered and driven. A pair of left and right rear wheels 2 are supported at the rear of the chassis frame 10 via a wheel drive box 14 that enables them to be driven. The output of the engine 4 is input to the front gearbox 13, and the input power is transmitted to the left and right front wheels 1 via a drive transmission (not shown) housed in the front gearbox 13, thereby driving the left and right front wheels 1. The power input from the engine 4 to the front gearbox 13 is input to the wheel drive box 14 via a rotating shaft 15 extending rearward from the drive transmission and the front gearbox 13, and the input power is transmitted to the wheel drive box 14 via a wheel transmission mechanism 16 housed in the wheel drive box 14 (see reference). Figure 2 The signal is transmitted to the left and right rear wheels 2, thereby driving the left and right rear wheels 2.

[0061] [Structure of the wheel drive box]

[0062] like Figure 2 , Figure 3 As shown, the wheel drive housing 14 is supported on the vehicle body 3 in a state that extends along the width direction of the vehicle body 3. Specifically, the body frame 10 has left and right main frames 17 extending in the front-rear direction of the vehicle body 3. The wheel drive housing 14 is connected to the support portions 18 formed on the left and right main frames 17 by connecting bolts.

[0063] like Figure 2 As shown, the rear wheel 2 is rotatably supported at both lateral ends of the wheel drive box 14 via the axle 2a. Figure 2 , Figure 3 As shown, in the middle part of the wheel drive box 14 in the width direction of the body, there is a shaft 15 (see reference) for the input from the driving transmission via the rotating shaft 15. Figure 1 The input shaft 19, which transmits power, is housed in the wheel drive housing 14, which transmits the power from the input shaft 19 to the left and right rear wheels 2. Figure 2 , Figure 4 As shown, the wheel drive mechanism 16 includes: a gear mechanism 20 housed in the middle portion of the wheel drive housing 14 in the width direction; a left-side linkage mechanism 16A that links the gear mechanism 20 to the axle 2a of the left rear wheel 2; and a right-side linkage mechanism 16A that links the gear mechanism 20 to the right-side axle 2a. The gear mechanism 20 includes a rotating shaft 15 (see reference). Figure 1 The input shaft 19 is linked. The gear mechanism 20 transmits the power to the input shaft 19 to the left rear wheel 2 via the left linkage mechanism 16A and the left axle 2a, and transmits the power to the input shaft 19 to the right rear wheel 2 via the right linkage mechanism 16A and the right axle 2a.

[0064] like Figure 2 , Figure 4 As shown, the wheel drive housing 14 includes a cylindrical portion 21 that protrudes outward from the middle of the body width of the wheel drive housing 14. The cylindrical portion 21 protrudes forward from the wheel drive housing 14. An input shaft 19 is provided in the gear mechanism 20, inserted into the cylindrical portion 21. Two bearings 22 are provided between the input shaft 19 and the cylindrical portion 21, with the input shaft 19 externally fitted into the input shaft 19 and internally fitted into the cylindrical portion 21. The input shaft 19 is rotatably supported on the cylindrical portion 21 via the two bearings 22. The two bearings 22 are arranged at intervals along the axis of the input shaft 19.

[0065] like Figure 4As shown, the gear mechanism 20 includes: a bevel gear 20a fixed to the input shaft 19; and a bevel gear 20b fixed to a rotary transmission shaft 23, which is located inside the wheel drive housing 14 extending along the width direction of the machine body. The bevel gear 20a of the input shaft 19 meshes with the bevel gear 20b of the rotary transmission shaft 23.

[0066] like Figure 2 As shown, the left and right linkage mechanisms 16A include: a rotary drive shaft 23; a drive shaft 25 connected via a steering clutch 24 to the end of the rotary drive shaft 23 opposite to the gear mechanism 20; and a gear linkage mechanism 26 that reduces the power of the drive shaft 25 and transmits it to the axle 2a. The rotary drive shaft 23 of the left linkage mechanism 16A and the rotary drive shaft 23 of the right linkage mechanism 16A are composed of the same rotary drive shaft.

[0067] like Figure 2 As shown, the wheel drive housing 14 includes an exhaust section 27 that exhausts air from the inside of the wheel drive housing 14 to the outside. The exhaust section 27 communicates with the interior of the cylinder section 21. Specifically, as... Figure 3 , Figure 4 As shown, the exhaust section 27 includes: a through hole 28 provided in the peripheral wall portion of the cylindrical portion 21; and a pipe portion 29 communicating with the through hole 28. The communication between the through hole 28 and the pipe portion 29 is achieved by connecting the end of the pipe portion 29 to the through hole 28 via a connecting sleeve. The opening 27a of the exhaust section 27 in the cylindrical portion 21 is formed by the opening of the through hole 28 on the side opposite to the pipe portion side. The air outlet 27b of the exhaust section 27 is formed by the opening of the pipe portion 29 on the side opposite to the through hole side. Figure 4 As shown, the opening 27a of the exhaust section 27 in the cylinder section 21 is positioned within the cylinder section 21 between the two bearings 22. Specifically, the opening 27a of the exhaust section 27 in the cylinder section 21 is located on the protruding end side of the cylinder section 21, relative to the first bearing 22a, which is closer to the input shaft 19 among the two bearings 22. Even if lubricating oil stored in the wheel drive housing 14 splashes due to the rotating bevel gears 20a and 20b, it will come into contact with the first bearing 22a, thus preventing lubricating oil from entering the opening 27a. The second bearing 22b, which is the bevel gear 20a furthest from the input shaft 19 among the two bearings 22, is located on the protruding end side of the cylinder section 21, relative to the opening 27a.

[0068] The tube section 29 is configured to be flexible. Specifically, the tube section 29 is composed of a flexible hose. For example... Figure 3As shown, the rotating shaft 33, which transmits power from the engine 4 to the seedling transplanting device 9, passes over the cylinder 21 in the front-to-back direction. The exhaust section 27 is arranged such that it passes around the rotating shaft 33 by bending the pipe section 29, and the pipe section 29 is supported on the driver's frame 34.

[0069] In the exhaust section 27, air located inside the wheel drive housing 14 flows through the space between the balls of the first bearing 22a into the interior of the cylinder 21, then flows into the pipe 29 through the opening 27a, and finally flows out through the air outlet 27b, thereby exhausting air from the inside of the wheel drive housing 14 to the outside. Even if lubricating oil stored inside the wheel drive housing 14 splashes into the cylinder 21 due to the agitation of the rotating bevel gears 20a and 20b, it will encounter the first bearing 22a, thus preventing the splashed lubricating oil from entering the opening 27a. Dust attempting to enter the cylinder 21 from the outside will encounter the second bearing 22b, thus preventing dust from entering the opening 27a.

[0070] like Figure 4 As shown, the cylinder 21 protrudes from the wheel drive housing 14 with an angle that is higher at the front and lower at the rear. The opening 27a of the exhaust 27 is located in the peripheral wall of the cylinder 21 at a position higher than the center X in the vertical direction of the wheel drive housing 14. Figure 2 As shown, the wheel drive box 14 includes: a middle box portion 14A extending along the width direction of the body; and a transverse box portion 14B extending downward from both ends of the middle box portion 14A in the width direction of the body. The center X in the vertical direction of the wheel drive box 14 is the center in the vertical direction of the middle box portion 14A.

[0071] like Figure 1 , Figure 4 As shown, the front gearbox 13 and the wheel drive housing 14 are positioned apart from each other in the longitudinal direction of the vehicle body 3. An output shaft 13a protrudes from the front gearbox 13 toward the wheel drive housing 14. The output shaft 13a and the input shaft 19, which constitutes the input shaft of the wheel drive housing 14, are linked together by a rotating shaft 15. The rotating shaft 15 and the output shaft 13a are connected by a universal joint 15a that spans the front end of the rotating shaft 15 and the output shaft 13a. The rotating shaft 15 and the input shaft 19 are connected by a cylindrical connecting member 15b. The linkage between the rotating shaft 15 and the input shaft 19, achieved by the connecting member 15b, is achieved by a spline hole provided on the connecting member 15b, which is externally fitted and engaged with a spline shaft portion 15s provided at the rear end of the rotating shaft 15 and a spline shaft portion 19s provided at the front end of the input shaft 19. The connecting component 15b is connected to the input shaft 19 via the connecting pin 15c and can slide relative to the rotating shaft 15.

[0072] The input shaft 19 protrudes from the wheel drive box 14 in an inclined state (front-high, rear-low state) with the protruding end side being higher. Compared to the input shaft 19 being protruding in a horizontal state, the front-high, rear-low angle of the rotation shaft 15 is more gradual.

[0073] like Figure 2 , Figure 3 As shown, the wheel drive box 14 includes: a middle box portion 14A extending along the width direction of the body; and a transverse box portion 14B extending downward from both ends of the middle box portion 14A in the width direction of the body. The left and right transverse box portions 14B are arranged such that the rear wheels 2 are supported on the lower part of the transverse box portions 14B.

[0074] like Figure 3 As shown, oil supply ports 30 for supplying lubricating oil to the interior of the wheel drive housing 14 are provided on both the left and right transverse housing portions 14B. Figure 3 , Figure 5 As shown, the oil supply port 30 is located on the upper part of the oil supply port forming portion 31, which protrudes upward from the horizontal box portion 14B. The oil supply port forming portion 31 includes a detachable bolt member 32 for opening and closing the oil supply port 30. Figure 3 , Figure 5 As shown, the oil supply port 30 is positioned higher than the center X of the wheel drive housing (the center of the middle housing 14A in the vertical direction). An amount of lubricating oil sufficient to pre-store the oil in the wheel drive housing 14 can be supplied from the oil supply port 30, that is, an amount of lubricating oil such that the oil level in the wheel drive housing 14 is at the same position as the center X of the wheel drive housing 14.

[0075] like Figure 3 , Figure 5 As shown, the left and right oil supply ports 30 are located on the outer periphery of the transverse box section 14B, facing the rear of the machine body.

[0076] [Other Implementation Methods]

[0077] (1) In the above embodiment, an example is shown where the pipe portion 29 of the exhaust section 27 can be bent, but it is not limited to this; the pipe portion 29 can also be a metal pipe. In this case, such as Figure 6As shown, the tube section 29 can be configured such that: the tube section 29a on the cylindrical side and the tube section 29b on the air outlet side; the tube section 29a on the cylindrical side is connected to the cylindrical section 21 and the bearing housing 36 which supports the bearing 35 externally mounted on the rotating shaft 33; the tube section 29b on the air outlet side extends from the bearing housing 36; and the tube section 29a on the cylindrical side and the tube section 29b on the air outlet side are connected via the internal space 36a of the bearing housing 36. The tube section 29 can be constructed using a straight metal tube, and the air outlet 27b of the exhaust section 27 is provided at a position higher than the rotating shaft 33 above the cylindrical section 21. The bearing housing 36 is supported on the body frame 10 via a support member 37.

[0078] (2) In the above embodiment, an example is shown where the gear mechanism 20 has a bevel gear 20a with an input shaft 19 and a bevel gear 20b with a rotation drive shaft 23, but it is not limited thereto. For example, it may also be a mechanism with three or more gears, or a differential mechanism.

[0079] (3) In the above embodiment, an example is shown in which the wheel drive box 14 supports the rear wheel 2 so that it can be driven, but it is also possible that the wheel drive box 14 supports the front wheel 1 so that it can be driven.

[0080] (4) In the above embodiment, an example with a horizontal box portion 14B is shown, but it is also possible to have a horizontal box portion 14B without it.

[0081] (5) In the above embodiment, an example is shown where the second bearing 22b is provided on the protruding end side of the cylindrical portion 21, which is closer to the opening 27a. However, the second bearing 22b may not be provided.

[0082] (6) In the above embodiments, 30 examples are shown where the oil supply port is located on the left and right transverse box portions 14B, but it may also be located on at least one of the left and right transverse box portions 14B. In addition, an example is shown where the oil supply port 30 is located on the outer periphery of the transverse box portion 14B facing the rear of the fuselage, but it may also be located on the outer periphery of the transverse box portion 14B in the front or upper part of the fuselage.

[0083] (7) In the above embodiment, an example is shown where the cylinder portion 21 protrudes from the middle portion in the width direction of the wheel drive box 14, but it is not limited to this and may also protrude from a portion other than the middle portion.

[0084] (8) In the above embodiment, an example is shown in which an exhaust portion 27 is provided in the cylindrical portion 21, but it can also be implemented as follows: a boss portion protruding high from the middle box portion 14A is provided and an exhaust portion for exhausting air from the boss portion is provided instead of the exhaust portion 27.

[0085] (9) The transverse box 14B is configured in such a way that it can be divided into two partitioned box sections in the front-back direction. The two partitioned box sections are formed into object shapes. Furthermore, the two partitioned box sections are manufactured in such a way that each of the two partitioned box sections has an oil supply port forming part. Thus, even if the transverse box section 14B is connected to either the left or right end of the middle box section 14A, an oil supply port 30 can be provided in either the left or right transverse box section 14B in the portion of the outer periphery of the transverse box section 14B facing forward of the machine body or in the portion facing backward of the machine body.

[0086] (10) The present invention can be applied to a work vehicle, which includes: a wheel drive box supported on a traveling body in a state extending along the width direction of the body; wheels supported on the two lateral ends of the wheel drive box in a driveable manner; an input shaft protruding from the wheel drive box to the outside of the wheel drive box to input power to the wheel drive box; and a cylinder portion protruding from the wheel drive box to the outside of the wheel drive box for insertion of the input shaft.

[0087] (11) The present invention can be applied to a work vehicle, which includes: a wheel drive box supported on a traveling body in a state extending along the width direction of the body; wheels supported at the two transverse ends of the wheel drive box; a gear mechanism housed in the middle part of the wheel drive box in the width direction of the body, transmitting power to the wheels at the two transverse ends; and a cylinder portion protruding from the middle part of the wheel drive box to the outside of the wheel drive box for the input shaft of the gear mechanism to pass through.

Claims

1. A work vehicle, characterized in that, have: The wheel drive box is supported on the traveling body in a manner that extends along the width of the body; The wheels are supported at the two lateral ends of the wheel drive box in a driveable manner; An input shaft protrudes from the wheel drive housing to the outside of the wheel drive housing and inputs power to the wheel drive housing; The cylindrical portion protrudes from the wheel drive housing to the outside of the wheel drive housing, through which the input shaft is inserted; as well as The exhaust section exhausts air from inside the wheel drive housing to the outside. The cylindrical portion is provided in an inclined state, with the higher position relative to the protruding end. The exhaust section is connected to the interior of the cylinder section. The opening of the exhaust section in the cylinder is located in a position on the peripheral wall of the cylinder that is higher than the center of the wheel drive box in the vertical direction. An oil supply port for supplying lubricating oil is provided inside the wheel drive box. The oil supply port is located on the upper part of the oil supply port forming portion that protrudes upward from the wheel drive box. It is equipped with a plug component for opening and closing the oil supply port. The opening is located at a position higher than the lower end of the oil supply port forming part.

2. The work vehicle according to claim 1, characterized in that, The input shaft and the cylindrical portion protrude from the middle portion of the running body of the wheel drive box in the width direction.

3. The work vehicle according to claim 2, characterized in that, The exhaust section includes: a through hole located on the peripheral wall; and a flexible pipe communicating with the through hole.

4. The work vehicle according to any one of claims 1 to 3, characterized in that, The wheel drive box includes: a middle box portion extending along the width direction of the body and having the cylindrical portion; and a transverse box portion disposed along the vertical direction of the body, extending downward from both ends of the middle box portion in the width direction of the body, and supporting the wheel at its lower part.

5. The work vehicle according to any one of claims 1 to 3, characterized in that, have: The gearbox is positioned relative to the wheel drive box on the side where the cylinder is located, in a state that is away from the wheel drive box in the longitudinal direction of the machine body. An output shaft, protruding from the gearbox toward the wheel drive housing and positioned higher than the input shaft; and A rotating shaft is used to connect the input shaft and the output shaft in a linked manner. The input shaft protrudes from the wheel drive box at an angle, with the higher position relative to the protruding end.

6. The work vehicle according to claim 5, characterized in that, It includes: a universal joint to connect the rotating shaft and the output shaft. It includes: a connecting component having a spline hole externally fitted into the spline shaft portion of the rotating shaft and the spline shaft portion of the input shaft, connecting the rotating shaft and the input shaft.

7. A work vehicle, characterized in that, have: The wheel drive box is supported on the traveling body in a manner that extends along the width of the body; The wheels are supported at the two lateral ends of the wheel drive box; A gear mechanism is housed in the middle part of the wheel drive box in the width direction, and transmits power to the wheels at the two lateral ends; An input shaft protrudes from the middle portion of the wheel drive housing to the outside of the wheel drive housing and inputs power to the gear mechanism; A cylindrical portion protrudes from the middle portion of the wheel drive housing to the outside of the wheel drive housing, through which the input shaft is inserted; The gearbox is positioned relative to the wheel drive box on the side where the cylinder is located, in a state that is away from the wheel drive box in the longitudinal direction of the machine body. An output shaft is provided protruding from the gearbox toward the side where the wheel drive box is located; A rotating shaft is used to connect the input shaft and the output shaft in a linked manner. A bearing, externally fitted to the input shaft and internally fitted into the cylindrical portion, is disposed between the cylindrical portion and the input shaft; and The exhaust section exhausts air from inside the wheel drive housing to the outside. Lubricating oil is stored inside the wheel drive box. The exhaust section has an opening in the cylindrical section and a pipe section connected to the opening in the cylindrical section, and the exhaust section communicates with the interior of the cylindrical section. The opening of the exhaust section in the cylinder is located in the cylinder at a position closer to the protruding end of the cylinder than the bearing. The interior portion of the cylindrical section containing the opening and the interior portion of the wheel drive box are separated by the bearing.

8. The work vehicle according to claim 7, characterized in that, A second bearing is provided between the portion of the cylindrical part located on the protruding end side, which is closer to the opening than the portion where the opening is located, and the input shaft. The bearing is externally embedded in the input shaft and internally embedded in the cylindrical part.

9. The work vehicle according to claim 7 or 8, characterized in that, The tube is flexible.

10. The work vehicle according to claim 7 or 8, characterized in that, The wheel drive housing includes: a middle housing portion extending along the width direction of the machine body and having the cylindrical portion; and a transverse housing portion disposed along the vertical direction of the machine body, extending downward from both ends of the middle housing portion in the width direction of the machine body, and supporting the wheel at its lower part. An oil supply port for supplying lubricating oil to the interior of the wheel drive box is located at least one of the transverse box portions at both ends, in a position higher than the center of the body in the vertical direction of the middle box portion.

11. The work vehicle according to claim 10, characterized in that, The oil supply port is located on both sides of the horizontal box section at both ends.

12. The work vehicle according to claim 10, characterized in that, The wheel drive box is located at the rear of the vehicle body. The oil supply port is located on the outer periphery of the transverse box section, facing the rear of the machine body.

Images