JP2002156028A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently connect drain piping of a hydraulic unit for work and a hydraulic unit for traveling taking lubricating oil of a transmission case as a hydraulic fluid to the transmission case. SOLUTION: Plural oil receiving sleeves 33 to 35 are provided on one side wall 31 of the transmission case 30. A drain piping 16 of a single-acting lift cylinder, a drain piping 17 of a control valve of a lift cylinder and a drain piping 29 of the main transmission for traveling are individually connected to the plural oil receiving sleeves 33 to 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working hydraulic device for operating a working device or a working hydraulic device for operating a traveling device in which lubricating oil is supplied as operating oil from a transmission case to the traveling hydraulic device. About the car.

[0002]

2. Description of the Related Art In the work vehicle described above, drain oil discharged from a working and traveling hydraulic device and drain oil returned from an actuator to a valve are returned to a transmission case. For this reason, conventionally, as shown in FIG. 10, for example, an oil receiving cylinder portion 61 made of a pipe material whose one end enters a through hole of a wall of the transmission case 30 and is fixed to the wall by a mounting screw 60 is provided in the transmission case 30. The drain pipe P of the working and traveling hydraulic devices is connected to the oil receiving cylinder 30.

[0003] In the above-mentioned work vehicles, there is an operation vehicle in which an oil inspection cylinder is provided in a transmission case, and an amount of lubricating oil stored in the transmission case is detected by an oil inspection rod configured to be inserted into the oil inspection tube. In this type, conventionally, a sheet metal inspection rod has been adopted. That is, it is necessary to provide the detection section at the tip of the oil inspection rod with an area that makes it easy to see whether or not oil has adhered, and also to which part the oil has adhered. If the thickness is provided over the entire length of the oil detecting rod, the oil detecting rod may be hardly bent and may not easily enter the oil detecting cylinder. If the oil detecting cylinder is bent significantly, it may not be able to be inserted because it does not bend along the cylinder. If the portion other than the detecting portion of the oil detecting rod is made thinner than the detecting portion so as to be easily bent, the shape of the detecting rod becomes complicated and the cost increases. For this reason, an oil inspection rod made of sheet metal has been employed.

[0004] In the above-mentioned work vehicle, there has been one in which an oil supply cylinder is connected to a transmission case, and lubricating oil is supplied from the oil supply cylinder to the transmission case. In the case of this type, conventionally, when oil is supplied to the mission case, air that escapes from the mission case as the oil enters the mission case is discharged from an oil supply port of an oil supply cylinder.

[0005] In the above-mentioned work vehicle, there is a work vehicle in which a working hydraulic device is for a work device connected to a rear portion of the traveling machine body, and a transmission case is arranged at a front portion of the traveling machine body. Conventionally, a single-acting cylinder is used as a working hydraulic device. In this type, a drain pipe of the cylinder is connected to a transmission case located at a rear portion of the traveling machine body, and an oil chamber of the cylinder is moved from an oil chamber of the cylinder to an air chamber. The oil leaked to the vehicle was collected by a drain pipe in the transmission case on the rear side of the fuselage.

[0006]

An oil receiving cylinder is provided in a transmission case, and a drain pipe of a working hydraulic device or a traveling hydraulic device is connected to the oil receiving cylindrical portion to transmit drain oil from each hydraulic device. When returning to the case, assembling the work vehicle if the oil receiving tube portion for the working hydraulic device and the oil receiving tube portion for the traveling hydraulic device are dispersed on different side walls of the transmission case. At this time, for example, after connecting the drain pipe of the working hydraulic device to the oil receiving cylinder on the left side wall of the transmission case, move to the right side of the transmission case and connect the drain pipe of the traveling hydraulic device to the right side wall of the transmission case. It takes time and effort to connect to the oil receiving cylinder, and the work efficiency is reduced.

Further, when the oil receiving cylinder of the transmission case projects from the outer end of the side wall of the transmission case, the oil receiving cylinder may hit an object located in the vicinity when the transmission case is transferred or assembled to the machine body. The trouble that the tool or the like held by the user hits the oil receiving cylinder is likely to occur.

In the case where the amount of oil stored in the mission case is detected by an oil inspection rod, it has conventionally been difficult to insert the oil inspection rod into the oil inspection cylinder. In other words, depending on the insertion direction when inserting the oil detecting rod into the detection cylinder, the direction in which the oil detecting rod should be bent when the oil detecting rod is advanced while bending is in a direction along the width of the sheet metal or a direction close thereto. It may be. Then, in fact, the oil detecting rod does not bend or is hardly bent, so that it becomes difficult to enter.

Conventionally, in a case where a transmission case is provided with an oil supply cylinder, conventionally, when a large amount of oil suddenly flows in at the time of refueling, the oil flows backward due to air which tends to escape from the transmission case, and the oil supply cylinder is provided with the oil supply cylinder. It was easy to overflow from the filler.

In the case where the working device is connected to the rear part of the traveling body and the working hydraulic device is provided with a single-acting cylinder, conventionally, drain oil from this cylinder is transferred to the transmission case at the rear part of the body. There is a problem that the lubricating oil in the transmission case at the front of the fuselage gradually decreases due to the recovery.

An object of the present invention is to make it possible to efficiently connect a drain pipe, to prevent trouble such as an oil receiving cylinder hitting a peripheral object, to reduce oil due to collection of drain oil, to insert an oil detecting rod, An object of the present invention is to provide a work vehicle that can easily prevent oil overflow during refueling.

[0012]

The constitution, operation and effect of the invention according to claim 1 are as follows.

[Structure] In a working vehicle configured to supply a lubricating oil as a working oil from a transmission case to a working hydraulic device for operating a working device and a traveling hydraulic device for operating a traveling device, An oil receiving cylinder for connecting the drain pipe of the working hydraulic device to return the drain oil from the working hydraulic device to the transmission case, and connecting the drain pipe of the running hydraulic device to the running hydraulic device to And an oil receiving cylinder portion for returning the drain oil to the transmission case is provided on the same side wall of the transmission case.

[Operation] An oil receiving cylinder for connecting a drain pipe of a working hydraulic device and an oil receiving cylinder for connecting a drain pipe of a traveling hydraulic device are mounted on the same side wall of the transmission case. Since it is provided, any drain pipe can be connected to the oil receiving cylinder part of the transmission case from one operation point such as a rear part of the transmission case without moving around the transmission case and changing the operation point.

[Effect] Therefore, in assembling the machine body, the drain pipe of the working hydraulic device and the drain pipe of the traveling hydraulic device can be quickly connected to the transmission case from one working point, and the assembling work can be performed efficiently. .

The structure, operation and effect of the invention according to claim 2 are as follows.

(Structure) In the structure of the invention according to claim 1, the oil receiving cylinder portion for connecting a drain pipe of the working hydraulic device, and the oil receiving tube portion for connecting a drain pipe of the traveling hydraulic device. The oil receiving cylinder is formed integrally with the side wall of the transmission case.

[Operation] Since each oil receiving cylinder is formed integrally with the side wall of the transmission case, any of the oil receiving cylinders can be formed together with the transmission case when forming the transmission case.

[Effects] All the oil receiving cylinders are formed at once with the transmission case and are provided at a low cost. From this viewpoint, the cost can be reduced because the connection work of each drain pipe can be performed efficiently.

The structure, operation and effect of the invention according to claim 3 are as follows.

[Structure] In a working vehicle configured to supply lubricating oil as hydraulic oil from a transmission case to a working hydraulic device for operating a working device and a running hydraulic device for operating a traveling device, An oil receiving cylinder for connecting a drain pipe of the working hydraulic device to return drain oil from the working hydraulic device to the transmission case; and a running hydraulic device connecting the drain pipe of the running hydraulic device An oil receiving cylinder for returning the drain oil from the transmission case to the transmission case is provided in the recessed portion of the side wall of the transmission case.

[Operation] Since the oil receiving cylinder portion is provided in the concave portion of the side wall of the transmission case, the depth of the concave portion is set to an appropriate depth according to the length of the oil receiving cylindrical portion. The oil receiving cylinders are inserted into the recesses such that at least the tip of the oil receiving cylinder is aligned with the outer end of the transmission case side wall so that the oil receiving cylinder does not protrude outside the outer end of the transmission case side wall. Can be.

[Effect] Therefore, the oil receiving cylinder is prevented from protruding outside the outer end of the side wall of the transmission case so that the oil receiving cylinder hits a peripheral object when transferring or assembling the transmission case. In addition, the operator can work while hardly causing the oil receiving portion to be damaged due to, for example, applying a tool to the oil receiving tube portion.

The structure, operation and effect of the invention according to claim 4 are as follows.

[Structure] A working hydraulic device for operating a working device, and a working vehicle configured to supply lubricating oil as hydraulic oil from a transmission case to the running hydraulic device for operating a traveling device. An oil detecting rod for detecting the amount of stored oil by being inserted into an oil detecting cylinder of the transmission case is made of rubber and provided.

[Operation] Since the oil detecting rod is made of rubber, the entire detecting rod has the same or almost the same thickness as that of the detecting part, and has a round cross section. Over the detection tube, and even if the detection tube is bent significantly, even if the detection tube is bent significantly, the detection tube is bent freely along the detection tube. Go inside.

[Effect] Therefore, the detection rod can be obtained in a simple shape over the whole and at a low cost.
The oil amount can be detected efficiently and efficiently by inserting the detection tube easily and quickly without worrying about the insertion direction.

The structure, operation and effect of the invention according to claim 5 are as follows.

[Structure] In a working vehicle configured to supply lubricating oil as hydraulic oil from a transmission case to a working hydraulic device for operating a working device and a traveling hydraulic device for operating a traveling device, The blazer chamber of the mission case communicates with the fuel cylinder of the mission case, and the cross-sectional area of the blazer chamber is larger than the area of the receiving port communicating with the fuel cylinder of the blazer chamber.

[Operation] Even if the oil injected into the oil supply cylinder flows backward due to the air escaping from the transmission case, it flows into the blazer chamber from the middle of the oil supply cylinder. Moreover, at this time, even if it flows out of the refueling cylinder with the air vigorously, when it flows into the blazer chamber, the power drops quietly due to the difference between the receiving port and the cross-sectional area of the blazer chamber, It is difficult to blow out from the blazer room.

[Effect] Therefore, even if the oil flows backward through the oil supply cylinder, it is difficult for the oil to flow into the blazer chamber and overflow from the oil supply port, and to gently stay in the blazer chamber and hardly leak from the blazer chamber. Can be replenished while minimizing leakage and waste.

The structure, operation and effect of the invention according to claim 6 are as follows.

[Configuration] A lubricating oil is supplied as working oil from a transmission case located at the front of the traveling body to a working hydraulic device for operating a working device connected to the rear of the traveling body. In a work vehicle, a discharge side of a drain pipe for taking out drain oil from an air chamber of a single-acting hydraulic cylinder of the working hydraulic device is connected to the transmission case.

[Operation] Since the drain oil from the cylinder is returned to the mission case from which it was originally taken out, the lubricating oil is reduced from the transmission case by the drain oil as in the case of being collected in another mission case. The drain oil can be collected while preventing the oil from going down.

[Effect] Therefore, the lubricating oil in the transmission case does not decrease due to drain oil recovery, and poor lubrication of the transmission hardly occurs even if the lubricating oil is not replenished frequently.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a pair of left and right steerable and drivable front wheels 1, a pair of left and right drivable rear wheels 2, a prime mover having an engine 3 located at the front end of the fuselage. A seedling planting device 7 is connected via a link mechanism 6 to a rear portion of a body frame 5 of a traveling body provided with a driving section having a driving seat 4 located at a rear end of the body, and the output of the engine 3 of the traveling body is rotated. The link mechanism 6 is configured to be transmitted to the seedling planting device 7 by the shaft 8, and the link mechanism 6 is connected to the body frame 5 by a single-acting lift cylinder 10 that is connected between the operation unit of the link mechanism 6 and the body frame 5. The raising and lowering operation of the seedling planting device 7 is performed by swinging up and down to configure a riding type rice transplanter.

The rotational output of the main traveling transmission 20 for shifting the rotational power from the engine 3 is sub-shifted to the front and rear wheels 1, 2.
A transmission case 30 in which a gear-type auxiliary transmission that transmits the rotation of the auxiliary transmission and a gear-type work transmission that transmits the rotational output of the auxiliary transmission to the rotating shaft 8 are mounted. 3, the traveling main transmission 20 is provided laterally outside the transmission case 30.

As shown in FIG. 3, the traveling main transmission 20 is configured as a hydrostatic continuously variable transmission. That is, the variable displacement hydraulic pump 21 in which the input shaft is linked to the output shaft of the engine 3 via the belt type main clutch.
And a hydraulic motor 22 driven by pressure oil from the hydraulic pump 21 to transmit a rotation output to an input portion of the auxiliary transmission. Accordingly, the traveling main transmission 20 switches the rotational output from the engine 3 between the forward side and the reverse side by performing an operation of changing the swash plate angle of the hydraulic pump 21 and performs the operation on either the forward side or the reverse side. The transmission of the front and rear wheels 1, 2 is stopped by steplessly shifting the power to the sub-transmission and stopping the power transmission.
Drive to the forward side or the reverse side, change the speed, and perform the stop operation.

The traveling main transmission 20 has a hydraulic pump 2
The lubricating oil is taken out of the transmission case 30 by a suction oil passage 24 and is connected to the hydraulic pump 21 and the hydraulic motor 22 by an oil supply passage 25. Relief oil passage 27 extending over a pair of driving circuits 26
It is configured to supply to.

As shown in FIG. 2, a hydraulic pump 13 whose discharge side is connected to a pump port of a control valve 11 of the lift cylinder 10 by an oil supply passage 12 is provided on a lateral side of the transmission case 30. This hydraulic pump 13
Is driven by power transmitted from a transmission device in a transmission case, takes out lubricating oil from the transmission case 30 through a suction oil passage 14, and supplies the lubricating oil to the oil supply passage 1.
2, the control valve 11 is supplied.

That is, the lubricating oil stored in the transmission case 30 for lubrication of the transmission is supplied to the traveling main transmission 20 and the lift cylinder 10, and both the traveling main transmission 20 and the lift cylinder 10 are lubricated. The oil is operated as hydraulic oil.

As shown in FIG.
A drain port 10a for taking out oil leaking from the oil chamber to the air chamber, drain oil discharged from the drain port 10a, drain oil discharged from the tank port of the control valve 11, and the traveling main speed change. 5 and 6 show a drain oil passage for returning each of the drain oil discharged from the drain port 20a of the device 20 to the transmission case 30.
It is configured as shown in FIG.

That is, by providing a ridge 32 which is also used for a rib extending over the entire periphery around a part of the side wall 31 facing the fuselage rearward of the transmission case 30, the part is formed as a recess 31 a of the side wall 31. At a plurality of locations inside the recess 31a, oil receiving cylinders 33 to 36 which are open rearward and communicate with the inside of the transmission case 30 are formed integrally with the side wall 31 when the transmission case 30 is cast. It is. Each oil receiving cylinder 3
The tip 33a-36a of 3-36 is the said ridge 3 of the side wall 31.
2 are arranged on the same plane as the outermost end 32a formed by the second end face, so that the oil receiving cylinder portions 33 to 36 do not protrude outside the outermost end 32a of the side wall 31 so that the recessed portion 31a is formed. The depth is set.

The drain port 1 of the lift cylinder 10
Oa, the discharge side of the drain pipe 16 composed of a hose is connected to one of the plurality of oil receiving cylinders 33 to 36.
And is connected to the oil receiving portion 33 by tightening and fixing with a hose band B, and the drain oil from the lift cylinder 10 is returned from the oil receiving cylindrical portion 33 to the transmission case 30 by the drain pipe 16. .

The discharge side of a drain pipe 17 composed of a hose extending from the tank port 14 of the control valve 11 is fitted around one of the plurality of oil receiving cylinders 33 to 36 and fastened by a hose band B. By fixing, it is connected to the oil receiving portion 34 and the control valve 11
From the oil receiving cylinder portion 34 to the transmission case 30 via the drain pipe 17.

Drain port 20 of traveling main transmission 20
The drain side of the drain pipe 29 composed of a hose extending from the outer side of the drain pipe 29 is externally fitted to one of the plurality of oil receiving cylinders 33 to 36 and is fastened and fixed by a hose band B, so that the oil receiving section 35 is formed. And the drain oil from the traveling main transmission 20 is returned from the oil receiving cylinder 35 to the transmission case 30 by the drain pipe 29.

As shown in FIG. 4 and FIG. 5, etc., a metal pipe 41 having a circular cross section disposed outside the transmission case 30 and a lower end of the metal pipe 41 is connected to the plurality of oil receiving cylinders 33 to 33. A rubber pipe 42 connected to one of the 36 constitutes an oil supply cylinder 40 which is also used as an oil inspection cylinder of the transmission case 30. As shown in FIG. 7 and the like, the air vent hole 37 of the transmission case 30 is refilled by an air vent pipe 43 having one end connected to the middle of the metal pipe 41 and the other end entering the air vent hole 37 of the transmission case 30. It is communicated in the middle of 40.

As shown in FIG. 5 and FIG. 7, a circular blazer chamber 48 of the transmission case 30 in a plan view is formed by a container 47 having a lower end connected by a communication pipe 46 in the middle of the metal pipe 41 of the oil supply cylinder 40. It is formed.
The circular through hole communicating with the communication pipe 46 of the container 47 forms a receiving port 48 a of the blazer chamber 48, and the receiving port 48 a communicates with the refueling cylinder 40 through the communication pipe 46. As a result, it communicates with the internal space of the transmission case 30 via the communication pipe 46, the oil supply cylinder 40, and the air vent pipe 43. The opening on the upper end side of the container 47 allows the blazer chamber 48 to be opened.
Is formed, and the ventilation port 4b is formed.
8 b is provided with a dust removing member 49 that allows the blazer chamber 48 to suck and exhaust while preventing dust from entering the blazer chamber 48. The cross-sectional area of the blazer chamber 48 is larger than the area of the receiving port 48a. The bottom of the container 47 is connected to a bracket 47a fixed to the upper portion of the transmission case 30, so that the transmission case 3 is mounted via the mounting member 47a.
0 supported.

The oil supply port 4 of the oil supply cylinder 40 is
A dual-purpose oil detecting rod 50 is attached to the plug 1a. FIG.
As shown in the figure, the oil inspection rod 50 is formed as a round bar having a circular cross section over the entire length and a small-diameter portion 51a having a small diameter portion 51a whose outer diameter is slightly smaller than that of the other portion at a part on the tip side. An oil rod main body 51, a rubber plug 52 integrally formed on the base end side of the oil detection rod main body 51, and a rubber plug integrally formed on the opposite side of the plug 52 from the oil detection rod main body 51. It is constituted by a knob 53. That is, the configuration is such that the lubrication rod main body 51 and the plug part 52 are inserted into and removed from the refueling cylinder 40 by holding the knob 53 by hand. When the oil inspection rod main body 51 is inserted into the oil supply cylinder 40 and the tip 53a of the knob 53 is brought into contact with the distal end of the metal pipe 41 of the oil supply cylinder 40, the plug 52 enters the oil supply port 41a and the oil inspection rod main body. The plug 51 is at the predetermined insertion depth and is in the attached state for detection. When the plug and the detection attachment state are set, the plug portion 52 is
If the lubricating oil is stored in the transmission case 30 and the amount of the lubricating oil stored in the transmission case 30 is appropriate, the level of the oil level becomes the level at which the small-diameter portion 51 a of the oil detecting rod main body 51 is located. The lubricating oil is configured to adhere from the tip 51b of the main body 51 to the small diameter portion 51a.

That is, the hydraulic pumps 13 and 23 take out the lubricating oil from the transmission case 30 or the control valve 1
1. When the amount of lubricating oil in the transmission case changes due to the return of oil from the lift cylinder 10, the traveling main transmission 20 to the transmission case 30, the transmission case 30 sucks and exhausts as follows. That is, the air in the transmission case is removed from the air vent pipe 43,
The oil is discharged into the blazer chamber 48 via the fuel supply cylinder 40 and the communication pipe 46, and is discharged from the ventilation case 48b of the blazer chamber 48 to outside the transmission case. The air outside the mission case is sucked into the blazer chamber 48 from the vent hole 48b, and is sucked from the blazer chamber 48 into the mission case via the communication pipe 46, the fuel supply cylinder 40, and the air vent pipe 43.

When lubricating oil is supplied to the transmission case 30, the oil detecting rod 50 is removed from the oil supply cylinder 40, and lubricating oil is injected from the oil supply port 41a opened thereby. At this time, a large amount of oil suddenly flows into the transmission case 3
If the air is about to flow back from zero, oil will flow from the communication pipe 46 into the blazer chamber 48. At this time, even if the oil rushes out of the oil supply cylinder 40 together with the air, when the oil flows into the blazer chamber 48, the momentum decreases due to the difference between the receiving area 48a of the blazer chamber 48 and the cross-sectional area, and the oil is quiet. And the oil hardly blows out from the blazer chamber 48, and the oil hardly overflows from the oil supply port 41a or the blazer chamber 48.

When the amount of lubricating oil in the transmission case is detected, for example, during lubrication, the lubricating rod 50 is inserted into the lubrication cylinder 40, and is removed from the lubrication cylinder 40 after the plug and the detection mounting state are established. That is, when oil does not adhere to any part of the oil inspection rod main body 51 of the oil inspection rod 50 removed from the oil supply cylinder 40, and when oil is attached, the area where oil is attached is the small diameter portion 51a. If not, it is determined that the oil amount is less than the appropriate amount. If the range where the oil adheres remains at the small diameter portion 51a, it is determined that the oil amount is appropriate. The area on which the oil is attached is the oil sensor rod body 51
If the oil amount exceeds the small diameter portion 51a to the base end side, it is determined that the oil amount is larger than the appropriate amount.

The hydraulic pump 13 is used for the transmission case 3
Mission case 3 to act on oil taken from 0
The strainer 56 attached to the oil take-out portion 0 is configured as shown in FIGS. That is, a synthetic resin strainer portion 57 which is inserted into the transmission case through the oil extraction hole of the transmission case 30, is integrally formed on one end of the strainer portion 57, and is fixed around the oil extraction hole of the transmission case 30. And an annular mounting portion 58.
The strainer portion 57 includes a plurality of strainer vertical walls 57a radially arranged in a cross-sectional view of the strainer 56 and a pair of strainer vertical walls 57a adjacent to each other in the circumferential direction of the strainer 56, and ends on the outer circumferential side of the strainer. Are connected to each other by a strainer peripheral wall 57b. Strainer vertical wall 57a and strainer peripheral wall 5
7b is formed integrally with a shape retaining bar 59.

[Other Embodiments] The present invention can be applied to various working machines such as a cultivator and a combine in addition to a rice transplanter. Further, in addition to the lift cylinder 10 and the control valve 11 for raising and lowering the working device, the present invention can be applied to a rolling cylinder for performing rolling control of the working device and a hydraulic device for returning the drain oil of the control valve to the transmission case 30. Also,
In addition to the hydrostatic main transmission 20 for traveling, the present invention can also be applied to a hydraulic transmission that returns drain oil of a hydraulic transmission that switches a shift gear of a gear transmission to a transmission case. Therefore, the seedling planting device 7, the tilling device and the like are collectively referred to as the working device 7, and the lift cylinder 10, the rolling cylinder, the control valve 11 and the like are collectively referred to as the working hydraulic device 10 for operating the working device. Called 11. Further, the traveling main transmission 20, the hydraulic transmission, and the like are collectively referred to as a traveling hydraulic device 20 for operating the traveling device.

[Brief description of the drawings]

FIG. 1 is a side view of an entire riding type rice transplanter.

FIG. 2 is a hydraulic circuit diagram of a lift cylinder.

FIG. 3 is a hydraulic circuit diagram of a traveling main transmission.

FIG. 4 is a side view of a portion of the transmission case where a fueling cylinder is provided.

FIG. 5 is a rear view of the transmission case.

FIG. 6 is a sectional view of a drain pipe connection portion of a transmission case.

FIG. 7 is a cross-sectional view of a blazer chamber and a fuel tank of a transmission case.

FIG. 8 is a side view of the strainer in a partially cut-out state.

FIG. 9 is a cross-sectional view of a strainer.

FIG. 10 is a sectional view of a conventional drain pipe connection portion.

[Explanation of symbols]

 7 Working device 10, 11 Working hydraulic device 16, 17 Drain pipe of working hydraulic device 20 Running hydraulic device 29 Drain piping of running hydraulic device 30 Transmission case 31 Side wall 31a Side wall recessed portion 33, 34, 35 Oil receiving Cylinder 40 Refueling cylinder, oil inspection cylinder 48 Blazer chamber 48a Receiving port 50 Oil inspection rod

 ──────────────────────────────────────────────────の Continued on the front page (72) Yoshihide Miyanishi 64, Ishizukitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Works, Ltd. (72) Inventor Hiroyuki Miki 64, Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. Office (72) Inventor Mikio Okuyama 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory (72) Inventor Manabu Togo 64 Ishizukita-machi, Sakai City, Osaka Prefecture F-term in Kubota Sakai Factory (Reference) 3J063 AA13 AC03 BA03 BA07 BA10 BA11 BA13 BB15 BB41 BB46 BB48 CA01 CC16 CD42 CD69 XC10 XD03 XD47 XD56 XD64 XE33 XG24 XG31 XG48 XG52

Claims (6)

[Claims] 1. A work vehicle configured to supply lubricating oil as hydraulic oil from a transmission case to a work hydraulic device that operates a work device and a travel hydraulic device that operates a travel device, An oil receiving cylinder for connecting a drain pipe of the working hydraulic device to return drain oil from the working hydraulic device to the transmission case; and a running hydraulic device connecting a drain pipe of the running hydraulic device. A work vehicle provided with an oil receiving cylinder portion for returning drain oil from the transmission case to the transmission case on the same side wall of the transmission case. 2. The oil receiving cylinder part for connecting a drain pipe of the working hydraulic device, and the oil receiving cylinder part for connecting a drain pipe of the traveling hydraulic device are connected to the side wall of the transmission case. Claim 1 which is integrally molded with
The working vehicle described. 3. A work vehicle configured to supply a lubricating oil as a working oil from a transmission case to a working hydraulic device that operates a working device and a traveling hydraulic device that operates a traveling device, An oil receiving cylinder for connecting a drain pipe of the working hydraulic device to return drain oil from the working hydraulic device to the transmission case; and a running hydraulic pressure connecting a drain pipe of the running hydraulic device. A work vehicle, wherein an oil receiving cylinder portion for returning drain oil from a device to the transmission case is provided in a recessed portion of a side wall of the transmission case. 4. A work vehicle configured to supply a lubricating oil as a working oil from a transmission case to a working hydraulic device for operating a working device and a running hydraulic device for operating a traveling device, A work vehicle provided with an oil inspection rod which is inserted into an oil inspection cylinder of the transmission case and detects the amount of stored oil, which is made of rubber. 5. A work vehicle configured to supply a lubricating oil as hydraulic oil from a transmission case to a working hydraulic device for operating a working device and a running hydraulic device for operating a traveling device, A work vehicle in which a blazer chamber of the mission case communicates with a middle of a fuel cylinder of the mission case, and a cross-sectional area of the blazer chamber is larger than an area of a receiving port communicating with the fuel cylinder of the blazer chamber. 6. A work configured to supply lubricating oil as hydraulic oil to a working hydraulic device for operating a working device connected to a rear part of the traveling body from a transmission case located at a front part of the traveling body. A work vehicle, wherein a discharge side of a drain pipe for taking out drain oil from an air chamber of a single-acting hydraulic cylinder of the working hydraulic device communicates with the transmission case.