CN114962597A - Working vehicle - Google Patents

Working vehicle Download PDF

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Publication number
CN114962597A
CN114962597A CN202111463755.1A CN202111463755A CN114962597A CN 114962597 A CN114962597 A CN 114962597A CN 202111463755 A CN202111463755 A CN 202111463755A CN 114962597 A CN114962597 A CN 114962597A
Authority
CN
China
Prior art keywords
wheel drive
machine body
input shaft
box
work vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111463755.1A
Other languages
Chinese (zh)
Inventor
大西哲平
小林鉴明
北井浩昭
奥井贵雅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2021025314A external-priority patent/JP2022127262A/en
Priority claimed from JP2021025315A external-priority patent/JP2022127263A/en
Application filed by Kubota Corp filed Critical Kubota Corp
Publication of CN114962597A publication Critical patent/CN114962597A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/027—Gearboxes; Mounting gearing therein characterised by means for venting gearboxes, e.g. air breathers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/121—Power-transmission from drive shaft to hub
    • B60B35/122—Power-transmission from drive shaft to hub using gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
    • F16H57/0424—Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Details Of Gearings (AREA)

Abstract

The work vehicle of the present invention includes: a wheel driving box extending along the width direction of the machine body; and wheels supported by both lateral end portions of the wheel drive case so as to be capable of being driven, wherein the work vehicle is capable of preventing clogging of an exhaust portion due to lubricating oil while simplifying a countermeasure structure for preventing clogging due to lubricating oil stored in the wheel drive case. The work vehicle of the present invention includes: and a tube section (21) which is provided so as to protrude from the wheel drive box (14) to the outside of the wheel drive box (14) and through which an input shaft (19) of the wheel drive box (14) is inserted. The cylindrical portion (21) is provided so as to protrude in an inclined state at a position higher toward the protruding end side. An exhaust section (27) of the wheel drive box (14) opens into the interior of the tube section (21) at a position higher than the center (X) of the wheel drive box (14) in the vertical direction, in the circumferential wall of the tube section (21).

Description

Working vehicle
Technical Field
The present invention relates to a work vehicle.
Background
[ background art 1 ]
The work vehicle is provided with: a wheel drive box supported on the traveling machine body in a state of extending along the width direction of the machine body; and wheels supported by both lateral end portions of the wheel drive box so as to be capable of being driven. As such a work vehicle, there is a riding type rice transplanter as shown in patent document 1, for example. The riding rice transplanter disclosed in patent document 1 includes a rear axle case as a wheel drive case and rear wheels as wheels.
In the above work vehicle, when the exhaust unit that exhausts air from the inside to the outside of the wheel drive case is provided, if the lubricating oil stored in the wheel drive case enters the exhaust unit, the exhaust unit is clogged.
[ background art 2 ]
The work vehicle is provided with: a wheel drive box supported on the traveling machine body in a state of extending along the width direction of the machine body; wheels supported at both lateral ends of the wheel drive box; and a gear mechanism accommodated in a middle portion in a width direction of the body of the wheel drive case and transmitting power to the wheels at both end portions in a lateral direction. As such a work vehicle, there is a riding type rice transplanter shown in patent document 1, for example. The riding rice transplanter disclosed in patent document 1 includes a rear axle box as a wheel drive box and a rear wheel as a wheel, and includes a gear mechanism having a bevel gear fixed to an input shaft and a bevel gear fixed to a transmission shaft.
In the above work vehicle, when the lateral end portion of the wheel drive case is provided with the exhaust portion for exhausting air from the inside to the outside of the wheel drive case, soil splashed by the wheels enters the air outlet of the exhaust portion and blocks the exhaust portion. Even if the exhaust portion is provided in the middle portion of the wheel drive case in order to prevent clogging of the exhaust portion due to soil splashed by the wheels, the exhaust portion is clogged if the lubricating oil stored in the wheel drive case enters the exhaust portion by being stirred and splashed by the rotating gears of the gear mechanism.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-203359
Disclosure of Invention
Problems to be solved by the invention
[ technical problem 1 ]
The technical problem corresponding to the background art 1 is as follows.
The invention provides a working vehicle, which can simplify a corresponding structure for preventing blockage caused by lubricating oil stored in a wheel driving box and prevent blockage of an exhaust part caused by the lubricating oil.
[ technical problem 2 ]
The technical problem corresponding to the background art 2 is as follows.
The invention provides a work vehicle, which can prevent blockage of an exhaust part caused by mud splashed by wheels and lubricating oil splashed by gears and simplify a blockage prevention structure.
Means for solving the problems
[ case 1 ]
The scheme corresponding to technical problem 1 is as follows.
The work vehicle of the present invention includes: a wheel drive box supported on the traveling machine body in a state of extending along the width direction of the machine body; wheels supported by both lateral end portions of the wheel drive box so as to be capable of being driven; an input shaft that protrudes from the wheel drive box to the outside of the wheel drive box and inputs power to the wheel drive box; a cylindrical portion protruding from the wheel drive case to the outside of the wheel drive case, through which the input shaft is inserted; and an exhaust portion that exhausts air from the inside to the outside of the wheel drive box, wherein the cylindrical portion is provided so as to protrude in an inclined state that is located higher toward a protruding end side, the exhaust portion communicates with the inside of the cylindrical portion, and an opening of the exhaust portion, which is located in the cylindrical portion, is disposed in a portion of a peripheral wall of the cylindrical portion that is located higher than a center of the wheel drive box in a vertical direction.
According to this configuration, the cylindrical portion provided so as to protrude from the wheel drive case is easier to provide the exhaust portion than a wheel drive case that needs to include a connecting portion or the like for supporting the wheel drive case on the machine body and thus makes it difficult to secure an empty space. Further, since the cylindrical portion is provided so as to protrude from the wheel drive case in an inclined state in which the cylindrical portion is located at a higher position on the projecting end side, the position of the exhaust portion located at the opening of the cylindrical portion is easily higher than the position of the center of the wheel drive case in the vertical direction. When the lubricant oil stored in the wheel drive case is stored in the wheel drive case in an amount equal to the position of the oil surface of the lubricant oil stored in the wheel drive case and the position of the center of the wheel drive case in the vertical direction, the amount of the lubricant oil to be stored in the wheel drive case in advance can be satisfied, and the lubricant oil is less likely to enter the opening of the exhaust portion located at a position higher than the position of the oil surface of the lubricant oil satisfying the required amount, and therefore, the countermeasure structure for preventing clogging can be completed only by the following simple structure, and clogging of the exhaust portion due to the lubricant oil can be prevented: the cylindrical portion is provided so as to project from the wheel drive case in an inclined state in which the cylindrical portion is located at a higher position on the projecting end side, and the exhaust portion is opened to the cylindrical portion at a portion of the cylindrical portion located at a higher position than the position of the center in the vertical direction of the wheel drive case.
In the present invention, it is preferable that the input shaft and the tube portion are provided to protrude from an intermediate portion of the wheel drive case in the width direction of the travel machine body.
According to this configuration, since the exhaust portion is easily provided at a position away from the wheel toward the lateral inner side of the machine body, it is easy to make it difficult for mud splashed by the wheel to enter the air outlet of the exhaust portion.
In the present invention, it is preferable that the exhaust unit includes: a through hole provided in the peripheral wall; and a bendable tube portion communicating with the through hole.
According to this configuration, even if a member such as a transmission system is present near the cylindrical portion, the exhaust portion can be disposed in a state of bypassing the member by bending the pipe portion, and therefore, the air outlet of the exhaust portion can be easily disposed at a desired position.
In the present invention, it is preferable that the wheel drive box includes: a middle box part extending along the width direction of the machine body and provided with the cylinder part; and a horizontal box part arranged along the vertical direction of the machine body, extending downwards from two ends of the middle box part in the width direction of the machine body, and supporting the wheels at the lower part.
According to this configuration, since the wheels are supported at a position lower than the middle box portion, the height of the middle box portion with respect to the ground is increased, and the minimum height above the ground of the machine body can be increased.
In the present invention, it is preferable to provide: a transmission case provided on the side of the cylindrical portion with respect to the wheel drive case in a state of being away from the wheel drive case in the front-rear direction of the machine body; an output shaft protruding from the transmission case toward the wheel drive case and located higher than the input shaft; and a rotating shaft that links the input shaft and the output shaft, wherein the input shaft protrudes from the wheel drive box in an inclined state in which the input shaft is located higher toward the protruding end side.
According to this configuration, the input shaft and the output shaft are coupled in an inclined state in which the rotary shaft is located at a higher position on the output shaft side, and the inclination angle of the rotary shaft can be made smaller than when the input shaft is disposed to protrude from the wheel drive case in a horizontal posture.
In the present invention, it is preferable to provide: a universal joint connecting the rotating shaft and the output shaft, and including: and a coupling member having a spline hole externally fitted to a spline shaft portion provided in the rotary shaft and a spline shaft portion provided in the input shaft, and coupling the rotary shaft and the input shaft.
According to this configuration, the rotary shaft and the input shaft are coupled by the coupling member having a simpler structure than the universal joint, and therefore, power can be transmitted from the output shaft to the input shaft by the inexpensive power transmission structure.
[ case 2 ]
The scheme corresponding to technical problem 2 is as follows.
The work vehicle of the present invention includes: a wheel drive box supported on the traveling machine body in a state of extending along the width direction of the machine body; wheels supported at both lateral ends of the wheel drive case; a gear mechanism which is accommodated in a middle portion in a machine body width direction of the wheel drive box and transmits power to the wheels at both ends in the lateral direction; a cylindrical portion protruding from the intermediate portion of the wheel drive case to the outside of the wheel drive case, and through which an input shaft of the gear mechanism is inserted; a bearing externally fitted to the input shaft and provided between the cylindrical portion and the input shaft in a state of being fitted in the cylindrical portion; and an exhaust section that exhausts air from an inside to an outside of the wheel drive case, the exhaust section communicating with an inside of the cylindrical section, an opening of the exhaust section located in the cylindrical section being disposed in a portion of the cylindrical section located closer to a protruding end side of the cylindrical section than the bearing.
According to this configuration, since the air outlet of the exhaust unit is more easily disposed at a position distant from the wheel in the machine width direction than when the exhaust unit is provided at the end portion of the wheel drive case in the machine width direction, it is difficult for soil to enter the air outlet even if the soil is splashed by the wheel, and clogging of the exhaust unit due to the soil splashed by the wheel can be prevented. Even if the lubricating oil stored in the wheel drive case is splashed by the stirring of the rotating gears of the gear mechanism, the lubricating oil is brought into contact with the bearing, and the splashed lubricating oil is prevented from entering the opening of the exhaust portion, which is located in the cylindrical portion, by the bearing.
Since the bearing that enables the input shaft to rotate smoothly relative to the cylindrical portion is used as a member for preventing the lubricating oil from entering the opening of the exhaust portion, a structure for preventing the exhaust portion from being clogged with the lubricating oil can be realized by a simple structure in which the exhaust portion is opened at a portion of the inside of the cylindrical portion that is located closer to the protruding end side of the cylindrical portion than the bearing.
In the present invention, it is preferable that a second bearing fitted externally to the input shaft and fitted internally to the cylindrical portion is provided between the input shaft and a portion of the cylindrical portion located closer to the projecting end than the portion where the opening is located.
According to this configuration, the second bearing prevents muddy water or the like from entering the opening of the exhaust portion, which is located in the cylindrical portion, from outside the cylindrical portion, and therefore the second bearing, which enables the input shaft to smoothly rotate relative to the cylindrical portion, is utilized to simplify the anti-clogging structure of the exhaust portion and also prevent clogging of the exhaust portion due to muddy water or the like.
In the present invention, it is preferable that the exhaust portion includes a bendable pipe portion.
According to this configuration, even if a member such as a transmission system is present near the cylindrical portion, the exhaust portion can be disposed in a state of bypassing the member by bending the pipe portion, and therefore, the air outlet of the exhaust portion can be easily disposed at a desired position.
In the present invention, it is preferable that the wheel drive box includes: a middle box part extending along the width direction of the machine body and provided with the cylinder part; and a lateral tank portion provided in the vertical direction of the machine body, extending downward from both end portions of the middle tank portion in the width direction of the machine body, and supporting the wheels at a lower portion thereof, wherein an oil supply port for supplying lubricating oil to the interior of the wheel drive tank is provided in at least one of the lateral tank portions at both end portions in a state of being positioned higher than the center of the middle tank portion in the vertical direction of the machine body.
According to this configuration, the lubricant oil can be supplied from at least one of the lateral tank portions in an amount that satisfies the amount of oil to be stored in the wheel drive case in advance, that is, in an amount such that the position of the oil surface of the lubricant oil stored in the wheel drive case is the same as the position of the center of the wheel drive case.
In the present invention, it is preferable that the fuel fill port is provided in both of the lateral tank portions at both end portions.
According to this configuration, even when an obstacle such as a wall is located on one lateral side of the machine body, the oil supply port of the lateral tank portion located on the opposite side to the obstacle can be used, and therefore, the lubricating oil can be easily replenished. In the case where there is no obstacle on both lateral sides of the machine body, the oil supply ports of both left and right lateral tank portions can be used, so that the lubricating oil can be quickly replenished.
In the present invention, it is preferable that the wheel drive box is provided at a rear portion of the traveling machine body, and the fuel supply port is provided at a portion of an outer peripheral portion of the lateral box portion, the portion being directed rearward of the machine body.
According to this configuration, the oil supply port faces the empty space behind the wheel drive case, and therefore, the lubricating oil can be easily injected into the oil supply port.
Drawings
Fig. 1 is a left side view showing the entirety of a riding type rice transplanter.
Fig. 2 is a front view showing the wheel drive case.
Fig. 3 is a rear view showing the wheel drive case.
Fig. 4 is a side view showing the gear mechanism, the input shaft, and the exhaust unit.
Fig. 5 is a left side view showing the fuel fill inlet.
Fig. 6 is a left side view showing an exhaust unit according to another embodiment.
Description of the reference numerals
2: wheels (rear wheels); 3: a traveling machine body; 6: a driving seat; 13: a gearbox (front gearbox); 13 a: an output shaft; 14: a wheel drive box; 14A: a middle box part; 14B: a horizontal box section; 15: a rotating shaft; 15 a: a universal joint; 15 b: a connecting member; 15 s: a spline shaft portion; 19: an input shaft; 19 s: a spline shaft portion; 20: a gear mechanism; 21: a barrel portion; 22 a: a bearing (first bearing); 22 b: a second bearing; 27: an exhaust section; 27 a: an opening; 28: a through hole; 29: a tube portion; 30: an oil supply port; x: a center.
Detailed Description
Hereinafter, an embodiment as an example of the present invention will be described with reference to the drawings.
In the following description, regarding a traveling machine body of a riding type rice transplanter ("an example of a working vehicle"), the direction of arrow F shown in fig. 1 and 4 is "machine body front", the direction of arrow B is "machine body rear", the direction of arrow U is "machine body upper", the direction of arrow D is "machine body lower", the direction on the front side of the paper of fig. 1 and 4 is "machine body left", and the direction on the back side of the paper is "machine body right".
[ entirety of riding type rice transplanter ]
As shown in fig. 1, the riding type rice transplanter includes: the traveling machine body 3 has a pair of left and right front wheels 1 and a pair of left and right rear wheels 2. A power unit 5 having an engine 4 is formed in a front portion of the travel machine body 3. The traveling machine body 3 has formed at its rear portion: the driver unit 8 includes a driver seat 6 and a steering wheel 7 for steering the front wheels 1. A seedling transplanting device 9 is connected with the rear part of the traveling machine body 3. The seedling planting device 9 and the traveling machine body 3 are connected via a link mechanism 11 extending rearward from the machine body frame 10 so as to be swingable upward and downward. The link mechanism 11 is operated to swing by the telescopic operation of the lift cylinder 12, whereby the seedling planting device 9 is operated to be lifted and lowered between a lowered operation state in which the ground contact floating plate 9a contacts the ground and a non-operation state in which the ground contact floating plate 9a is spaced upward from the ground. The seedling planting device 9 has six seedling planting mechanisms 9b arranged in the width direction of the traveling body 3 and is configured to be capable of planting seedlings to six planting rows.
The pair of left and right front wheels 1 are supported at the front portion of the body frame 10 via a front transmission case 13 that supports the pair of left and right front wheels 1 so as to be steerable and drivable. The pair of left and right rear wheels 2 are supported at the rear of the machine body frame 10 via a wheel drive box 14 that supports the pair of left and right rear wheels 2 so as to be capable of being driven. The output of the engine 4 is input to the front transmission 13, and the input power is transmitted to the left and right front wheels 1 via a running transmission (not shown) accommodated in the front transmission 13 to drive the left and right front wheels 1. The power input from the engine 4 to the front transmission case 13 is input to the wheel drive case 14 via a rotary shaft 15 extending rearward from the running transmission and the front transmission case 13, and the input power is transmitted to the left and right rear wheels 2 via a wheel transmission mechanism 16 (see fig. 2) housed in the wheel drive case 14 to drive the left and right rear wheels 2.
[ Structure of wheel drive case ]
As shown in fig. 2 and 3, the wheel drive box 14 is supported by the traveling machine body 3 in a state of extending in the width direction of the traveling machine body 3. Specifically, the body frame 10 includes left and right main frames 17 extending in the front-rear direction of the traveling body 3. The wheel drive box 14 is connected to support portions 18 formed on the left and right main frames 17, respectively, by connecting bolts.
As shown in fig. 2, the rear wheels 2 are rotatably supported at both lateral end portions of the wheel drive box 14 via axles 2 a. As shown in fig. 2 and 3, an input shaft 19 for inputting power transmitted from the traveling transmission via the rotary shaft 15 (see fig. 1) is provided at an intermediate portion in the machine body width direction of the wheel drive box 14, and a wheel transmission mechanism 16 for transmitting the power of the input shaft 19 to the left and right rear wheels 2 is accommodated in the wheel drive box 14. As shown in fig. 2 and 4, the wheel transmission mechanism 16 includes: a gear mechanism 20 accommodated in an intermediate portion in the machine body width direction of the wheel drive box 14; a left-side interlocking mechanism 16A for interlocking and connecting the gear mechanism 20 with the axle 2a of the left-side rear wheel 2; and a right-side interlocking mechanism 16A that interlocks the gear mechanism 20 with the right axle 2 a. The gear mechanism 20 includes an input shaft 19 linked to the rotary shaft 15 (see fig. 1). The gear mechanism 20 transmits the power transmitted to the input shaft 19 to the left rear wheel 2 via the left interlocking mechanism 16A and the left axle 2a, and transmits the power transmitted to the input shaft 19 to the right rear wheel 2 via the right interlocking mechanism 16A and the right axle 2 a.
As shown in fig. 2 and 4, the wheel drive box 14 includes a tube portion 21 protruding outward from the wheel drive box 14 from an intermediate portion of the wheel drive box 14 in the machine width direction. The cylindrical portion 21 projects forward from the wheel drive box 14. The input shaft 19 is provided in the gear mechanism 20 in a state of being inserted through the cylindrical portion 21. Two bearings 22 fitted to the input shaft 19 and fitted to the cylindrical portion 21 are provided between the input shaft 19 and the cylindrical portion 21, and the input shaft 19 is rotatably supported by the cylindrical portion 21 via the two bearings 22. The two bearings 22 are provided in a state of being arranged at intervals in a direction along the axial center of the input shaft 19.
As shown in fig. 4, 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, the rotary transmission shaft 23 being located inside the wheel drive box 14 in a state of extending in the machine body width direction. The bevel gear 20a of the input shaft 19 meshes with the bevel gear 20b of the rotary drive shaft 23.
As shown in fig. 2, the left and right link mechanisms 16A include: a rotary drive shaft 23; a transmission shaft 25 connected to an end of the rotary transmission shaft 23 on the side opposite to the gear mechanism 20 via a steering clutch 24; and a gear train 26 for reducing the speed of the power of the transmission shaft 25 and transmitting the reduced power to the axle 2 a. The rotary transmission shaft 23 of the left-hand linkage 16A and the rotary transmission shaft 23 of the right-hand linkage 16A are formed by the same rotary transmission shaft.
As shown in fig. 2, the wheel drive case 14 includes an exhaust unit 27 that exhausts air from the inside to the outside of the wheel drive case 14. The exhaust portion 27 communicates with the inside of the cylinder portion 21. Specifically, as shown in fig. 3 and 4, the exhaust unit 27 includes: a through hole 28 provided in the peripheral wall of the tube 21; and a pipe portion 29 communicating with the through hole 28. The communication between the through hole 28 and the pipe 29 is performed by connecting an end of the pipe 29 to the through hole 28 via a connecting tube. The opening 27a of the exhaust portion 27 located on the tube portion 21 is formed by an opening of the through hole 28 on the opposite side to the tube portion side. The opening of the pipe portion 29 on the side opposite to the through hole side constitutes an air outlet 27b of the exhaust portion 27. As shown in fig. 4, the opening 27a of the exhaust portion 27 located in the cylindrical portion 21 is disposed in a portion of the cylindrical portion 21 located between the two bearings 22. That is, the opening 27a of the exhaust portion 27 located in the cylindrical portion 21 is disposed closer to the protruding end side of the cylindrical portion 21 than the first bearing 22a, which is one of the bevel gears 20a closer to the input shaft 19, of the two bearings 22 in the cylindrical portion 21. The lubricating oil stored in the wheel drive case 14, even if splashed by the rotating bevel gears 20a, 20b, hits the first bearing 22a, and the first bearing 22a prevents the lubricating oil from entering the opening 27 a. Of the two bearings 22, the second bearing 22b, which is one of the bevel gears 20a distant from the input shaft 19, is positioned closer to the projecting end side of the cylindrical portion 21 than the opening 27 a.
The tube portion 29 is configured to be bendable. Specifically, the pipe portion 29 is formed of a flexible pipe. As shown in fig. 3, the rotating shaft 33, which transmits the power from the engine 4 to the seedling planting device 9, passes over the drum part 21 in the front-rear direction. The exhaust unit 27 is disposed in the following state: the pipe portion 29 is bent to pass around the rotation shaft 33, and the pipe portion 29 is supported by the cab frame 34.
In the exhaust portion 27, air located inside the wheel drive case 14 is discharged from the inside to the outside of the wheel drive case 14 by flowing out to the inside of the tube portion 21 through the space between the balls of the first bearing 22a, flowing into the tube portion 29 from the opening 27a, and flowing out from the air discharge port 27b through the inside of the tube portion 29. Even if the lubricating oil stored in the wheel drive box 14 is splashed into the cylinder 21 by the stirring of the rotating bevel gears 20a and 20b, the lubricating oil hits the first bearing 22a, and the splashed lubricating oil is prevented from entering the opening 27a by the first bearing 22 a. Dust that attempts to enter the interior from the outside of the cylinder portion 21 hits the second bearing 22b, and the second bearing 22b prevents the dust from entering the opening 27 a.
As shown in fig. 4, the cylindrical portion 21 is provided so as to protrude from the wheel drive box 14 in a state of being inclined in the front-rear direction, and the opening 27a of the exhaust portion 27 is disposed in a portion of the peripheral wall of the cylindrical portion 21 which is located higher than the center X in the vertical direction of the wheel drive box 14. As shown in fig. 2, the wheel drive box 14 includes: a middle box part 14A extending along the width direction of the machine body; and a horizontal box portion 14B extending downward from both ends of the middle box portion 14A in the machine width direction. 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.
As shown in fig. 1 and 4, the front transmission case 13 and the wheel drive case 14 are provided in the travel machine body 3 in a state of being separated in the front-rear direction of the travel machine body 3. The output shaft 13a protrudes from the front transmission case 13 toward the wheel drive case 14. The output shaft 13a and an input shaft 19 constituting an input shaft of the wheel drive box 14 are linked by a rotary shaft 15. The rotation shaft 15 and the output shaft 13a are coupled by a universal joint 15a provided so as to straddle the front end portion of the rotation shaft 15 and the output shaft 13 a. The rotary shaft 15 and the input shaft 19 are coupled by a cylindrical coupling member 15 b. The coupling of the rotary shaft 15 and the input shaft 19 by the coupling member 15b is performed by providing the coupling member 15b with spline holes that are externally fitted and engaged with a spline shaft portion 15s provided at the rear end portion of the rotary shaft 15 and a spline shaft portion 19s provided at the tip end portion of the input shaft 19. The coupling member 15b is coupled to the input shaft 19 by a coupling pin 15c and is slidable with respect to the rotating shaft 15.
The input shaft 19 is provided to protrude from the wheel drive box 14 in an inclined state (a front-high rear-low state) in which the position is higher toward the projecting end side. The front-to-back low angle of the rotary shaft 15 is reduced compared to the case where the input shaft 19 is disposed so as to project in a horizontal posture.
As shown in fig. 2 and 3, the wheel drive box 14 includes: a middle box part 14A extending along the width direction of the machine body; and a horizontal box portion 14B extending downward from both ends of the middle box portion 14A in the machine width direction. The left and right lateral box portions 14B are disposed such that the rear wheels 2 are supported by the lower portion of the lateral box portion 14B.
As shown in fig. 3, oil supply ports 30 for supplying lubricating oil to the interior of the wheel drive case 14 are provided in both the left lateral case portion 14B and the right lateral case portion 14B. As shown in fig. 3 and 5, the fuel fill inlet 30 is provided at an upper portion of a fuel fill inlet forming portion 31 provided to protrude upward from the lateral tank portion 14B. The fuel fill inlet forming portion 31 includes a detachable plug member 32 that opens and closes the fuel fill inlet 30. As shown in fig. 3 and 5, the fuel fill inlet 30 is disposed at a position higher than the center X of the wheel drive box (the center of the middle box portion 14A in the vertical direction of the machine body). The lubricant can be supplied from the oil supply port 30 in an amount that satisfies the amount of oil to be stored in the wheel drive case 14 in advance, that is, in an amount that makes the position of the oil surface of the lubricant stored in the wheel drive case 14 the same as the position of the center X of the wheel drive case 14.
As shown in fig. 3 and 5, the left and right fuel fill ports 30 are provided in the outer peripheral portion of the lateral tank portion 14B toward the rear of the machine body.
[ other embodiments ]
(1) In the above-described embodiment, the pipe portion 29 of the exhaust portion 27 is shown as being bendable, but the present invention is not limited thereto, and the pipe portion 29 may be a metal pipe. In this case, as shown in fig. 6, it may be configured that: the pipe portion 29 includes a pipe portion 29a on the cylinder side and a pipe portion 29b on the air outlet side, the pipe portion 29a on the cylinder side is connected to the cylinder portion 21 and a bearing housing 36 that supports a bearing 35 externally fitted to the rotating shaft 33, the pipe portion 29b on the air outlet side extends from the bearing housing 36, and the pipe portion 29a on the cylinder side and the pipe portion 29b on the air outlet side communicate with each other via an internal space 36a of the bearing housing 36. The pipe portion 29 can be formed by a linear metal pipe, and the air outlet 27b of the exhaust portion 27 can be provided at a position higher than the rotary shaft 33 passing above the cylindrical portion 21. The bearing housing 36 is supported by the body frame 10 via a support member 37.
(2) In the above-described embodiment, the example in which the gear mechanism 20 includes the bevel gear 20a of the input shaft 19 and the bevel gear 20b of the rotary drive shaft 23 has been described, but the present invention is not limited thereto. For example, a mechanism including three or more gears or a differential mechanism may be employed.
(3) In the above-described embodiment, the wheel drive box 14 has been described as an example in which the rear wheels 2 are supported so as to be drivable, but the wheel drive box 14 may be configured so as to support the front wheels 1 so as to be drivable.
(4) In the above embodiment, the example in which the horizontal box section 14B is provided is shown, but the horizontal box section 14B may not be provided.
(5) In the above-described embodiment, the example in which the second bearing 22b is provided on the projecting end side of the tube portion 21 with respect to the opening 27a is shown, but the second bearing 22b may not be provided.
(6) In the above-described embodiment, the example in which the fuel fill inlet is provided at 30 in the left and right lateral tank portions 14B has been described, but the fuel fill inlet may be provided at least in one of the left lateral tank portion 14B and the right lateral tank portion 14B. Further, although the fuel fill port 30 is shown as being provided in a portion of the outer peripheral portion of the lateral tank portion 14B that faces rearward of the machine body, it may be provided in a portion of the outer peripheral portion of the lateral tank portion 14B that faces forward of the machine body or above the machine body.
(7) In the above-described embodiment, the example in which the tube portion 21 is provided so as to protrude from the intermediate portion in the machine body width direction of the wheel drive box 14 has been described, but the present invention is not limited thereto, and the tube portion may be provided so as to protrude from a portion other than the intermediate portion.
(8) In the above-described embodiment, the exhaust portion 27 is provided in the cylinder portion 21, but it may be implemented as follows: a boss portion projecting high from the middle tank portion 14A is provided, and an exhaust portion for exhausting air from the boss portion is provided instead of the exhaust portion 27.
(9) The lateral tank portion 14B is disposed so as to be dividable into two divided tank portions in the front-rear direction, the two divided tank portions being in the target shape, and the two divided tank portions are manufactured in a state in which both the two divided tank portions are provided with the fuel fill port forming portions, whereby even if the lateral tank portion 14B is connected to either one of the left and right end portions of the middle tank portion 14A, the fuel fill port 30 can be provided in either one of the left and right lateral tank portions 14B at a portion of the outer peripheral portion of the lateral tank portion 14B that faces the front of the machine body or a portion thereof that faces the rear of the machine body.
(10) The present invention is applicable to a work vehicle including: a wheel drive box supported on the traveling machine body in a state of extending along the width direction of the machine body; wheels supported by both lateral end portions of the wheel drive box so as to be capable of being driven; an input shaft protruding from the wheel drive box to the outside of the wheel drive box and inputting power to the wheel drive box; and a cylindrical portion protruding from the wheel drive box to the outside of the wheel drive box and through which the input shaft is inserted.
(11) The present invention is applicable to a work vehicle including: a wheel drive box supported on the traveling machine body in a state of extending along the width direction of the machine body; wheels supported at both lateral ends of the wheel drive box; a gear mechanism accommodated in a middle portion of the wheel drive box in a width direction of the body and transmitting power to the wheels at both end portions in a lateral direction; and a cylindrical portion protruding from an intermediate portion of the wheel drive case to an outside of the wheel drive case, and through which an input shaft of the gear mechanism is inserted.

Claims (12)

1. A work vehicle is characterized by comprising:
a wheel drive box supported on the traveling machine body in a state of extending along the width direction of the machine body;
wheels supported by both lateral end portions of the wheel drive box so as to be capable of being driven;
an input shaft that protrudes from the wheel drive box to the outside of the wheel drive box and inputs power to the wheel drive box;
a cylindrical portion protruding from the wheel drive box to an outside of the wheel drive box, through which the input shaft is inserted; and
an exhaust unit configured to exhaust air from the inside to the outside of the wheel drive case,
the cylindrical portion is provided so as to project in an inclined state at a position higher toward the projecting end side,
the exhaust portion communicates with the interior of the cylinder portion,
the opening of the exhaust portion located in the cylindrical portion is disposed in a portion of the circumferential wall of the cylindrical portion located at a position higher than the center of the wheel drive box in the vertical direction.
2. The work vehicle of claim 1,
the input shaft and the cylindrical portion are provided to protrude from an intermediate portion of the wheel drive box in the width direction of the travel machine body.
3. The work vehicle of claim 2,
the exhaust unit includes: a through hole provided in the peripheral wall; and a bendable tube portion communicating with the through hole.
4. Work vehicle according to any of claims 1 to 3,
the wheel drive box is provided with: a middle box part extending along the width direction of the machine body and provided with the cylinder part; and a horizontal box part arranged along the vertical direction of the machine body, extending downwards from two ends of the middle box part in the width direction of the machine body, and supporting the wheels at the lower part.
5. The work vehicle according to any one of claims 1 to 4, characterized by comprising:
a transmission case provided on the side of the cylindrical portion with respect to the wheel drive case in a state of being away from the wheel drive case in the front-rear direction of the machine body;
an output shaft protruding from the transmission case toward the wheel drive case and located higher than the input shaft; and
a rotating shaft which links the input shaft and the output shaft,
the input shaft is provided so as to protrude from the wheel drive case in an inclined state in which the input shaft is located higher on the protruding end side.
6. The work vehicle of claim 5,
the disclosed device is provided with: a universal joint connecting the rotating shaft and the output shaft,
the disclosed device is provided with: and a coupling member having a spline hole externally fitted to a spline shaft portion provided in the rotary shaft and a spline shaft portion provided in the input shaft, and coupling the rotary shaft and the input shaft.
7. A work vehicle is characterized by comprising:
a wheel drive box supported on the traveling machine body in a state of extending along the width direction of the machine body;
wheels supported at both lateral ends of the wheel drive case;
a gear mechanism which is accommodated in a middle portion in a width direction of the body of the wheel drive box and transmits power to the wheels at both end portions in the lateral direction;
a cylindrical portion protruding from the intermediate portion of the wheel drive case to the outside of the wheel drive case, and through which an input shaft of the gear mechanism is inserted;
a bearing externally fitted to the input shaft and provided between the cylindrical portion and the input shaft in a state of being fitted in the cylindrical portion; and
an exhaust unit configured to exhaust air from the inside to the outside of the wheel drive case,
the exhaust portion communicates with the interior of the cylinder portion,
the opening of the exhaust portion, which is located in the cylindrical portion, is disposed in the cylindrical portion at a position closer to the protruding end side of the cylindrical portion than the bearing.
8. The work vehicle of claim 7,
a second bearing that is externally fitted to the input shaft and is internally fitted to the cylinder portion is provided between the input shaft and a portion of the cylinder portion that is closer to the protruding end side than the portion where the opening is located.
9. Work vehicle according to claim 7 or 8,
the exhaust unit includes a bendable pipe portion.
10. Work vehicle according to any of claims 7 to 9,
the wheel drive box is provided with: a middle box part extending along the width direction of the machine body and provided with the cylinder part; and a transverse box part arranged along the vertical direction of the machine body, extending downwards from two end parts of the middle box part in the width direction of the machine body, and supporting the wheels at the lower part,
an oil supply port for supplying lubricating oil to the interior of the wheel drive case is provided in at least one of the lateral case portions at the both end portions in a state of being located higher than the center of the middle case portion in the vertical direction of the machine body.
11. The work vehicle of claim 10,
the oil supply ports are provided in both of the lateral tank portions at both end portions.
12. Work vehicle according to claim 10 or 11,
the wheel driving box is arranged at the rear part of the traveling machine body,
the oil supply port is provided in a portion of the outer peripheral portion of the lateral tank portion that faces rearward of the machine body.
CN202111463755.1A 2021-02-19 2021-12-03 Working vehicle Pending CN114962597A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2021025314A JP2022127262A (en) 2021-02-19 2021-02-19 work vehicle
JP2021025315A JP2022127263A (en) 2021-02-19 2021-02-19 work vehicle
JP2021-025315 2021-02-19
JP2021-025314 2021-02-19

Publications (1)

Publication Number Publication Date
CN114962597A true CN114962597A (en) 2022-08-30

Family

ID=82971502

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111463755.1A Pending CN114962597A (en) 2021-02-19 2021-12-03 Working vehicle

Country Status (1)

Country Link
CN (1) CN114962597A (en)

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