JPH1156010A - Tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tractor capable of extremely readily and surely carrying out maintenance of a hydraulic lifting and lowering apparatus by providing liftable space for removing a hydraulic lifting and lowering apparatus from a vehicle body and constituting the lifted apparatus to be detachable to the rear side. SOLUTION: In a tractor providing with a floor sheet 22 so as to cover a hydraulic lifting and lowering apparatus 10 for working machines loaded in the rear of a tractor vehicle body 5 and constituted so as to make the rear side of the hydraulic lifting and lowering apparatus 10 open, a liftable space 30 for removing the hydraulic lifting and lowering apparatus for a vehicle body 5 is formed between floor sheet 22 and the lifted hydraulic lifting and lowering apparatus 10 is constituted so as to be detachable to the rear side. A draft control valve device, a horizontal control valve device and a valve for external hydraulic takeout are preferably attached to the hydraulic housing for constituting the hydraulic lifting and lowering apparatus 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tractor,
The present invention relates to a tractor for paddy fields, and more specifically, to a tractor having a hydraulic lifting device for a work implement mounted on a rear portion of a tractor body.

[0002]

2. Description of the Related Art A tractor is a traveling power vehicle, and various working machines such as a rotary cultivator are mounted through a working machine connecting device such as a three-point link to carry out cultivation work in paddy fields (fields). Therefore, high horsepower is required and weight reduction is required. Further, a hydraulic device for lifting and lowering a working machine having left and right lift arms mounted on a rear portion of a tractor vehicle body is required to be lightweight and easy to maintain and handle, and the hydraulic device is required to have an external hydraulic take-out device ( An auxiliary control valve) is required to be easily attached and detached as well as to be easily mounted.

Japanese Patent Application Laid-Open No. 4-349802 discloses that "a floor plate is provided so as to cover a hydraulic device for lifting and lowering a work machine mounted on a rear portion of a tractor body, and a rear side of the hydraulic device is configured to be open. The tractor according to claim 1, further comprising a mounting bracket protruding laterally on one side of the hydraulic device, and an auxiliary control valve mounted on a rear surface of the mounting bracket by a detachable bolt from the rear side. According to this conventional technique, there is a rear wheel fender on both sides of the rear part of the tractor body, and a hydraulic device is provided between the left and right rear wheel fenders. The presence of the floor plate makes it difficult to attach and detach the auxiliary control valve.

Therefore, in the prior art, it has been practically impossible to add another auxiliary control valve by superimposing it on the existing auxiliary control valve from the side.

[0005]

In the prior art described above, since the hydraulic lifting device mounted on the rear of the tractor body is covered with a floor plate (floor sheet), the maintenance of the hydraulic lifting device is performed. In other words, the troublesome work of removing the floor sheet was necessary. When the floor sheet is provided integrally with the cabin, it is necessary to remove the entire cabin every time the hydraulic elevating device is maintained, and the maintenance (maintenance) of the hydraulic elevating device is almost impossible. was there.

That is, the technology disclosed in the above-mentioned gazette,
Most tractors of the prior art do not consider the maintainability of a hydraulic lifting device having a lift arm. If the hydraulic lifting device is equipped with an auto-draft control valve device using an electromagnetic pilot valve that integrates an ascending and descending solenoid valve and a pilot switching valve, the valve is susceptible to dust and impurities and has failed. In that case, since the site cannot be determined,
Even though the frequency of maintenance was high, such issues were not considered.

[0007] The present invention is intended to provide a very easy and reliable maintenance of a hydraulic elevating device even in a tractor in which a hydraulic elevating device having a lift arm mounted on a rear part of a tractor body is covered with a floor sheet. The purpose is to do. The tractor can be multi-functionalized by attaching an external hydraulic take-out device to the hydraulic lift device, but the external hydraulic take-out device together with the hydraulic lift device can be removed from the tractor body for maintenance. This is also an object of the present invention.

[0008]

According to the present invention, a floor sheet 22 is provided so as to cover a hydraulic lifting device 10 for a working machine mounted on a rear portion of a tractor body 5, and a rear side of the hydraulic lifting device 10 is provided. Tractor 2 configured in an open shape
In order to achieve the above object, the following technical measures are taken.

That is, in the tractor 2 according to the present invention,
A liftable space 30 for detaching the hydraulic lifting device 10 from the tractor vehicle body 5 is provided between the floor lifting device 22 and the floor seat 22, and the lifted hydraulic lifting device 10 is configured to be able to be inserted and removed rearward. By adopting such a configuration, in order to maintain the hydraulic lifting device 10, the three-point link 11 such as a lift rod attached to the lift arm 9 is disconnected and the hydraulic piping ( With the main piping) and the wiring for electrical components disconnected (these operations are the same as in the prior art), the bolts of the hydraulic housing 33 bolted to the tractor body 5 are removed (formed on the floor sheet 22). The bolt is removed through the window provided, which is the same as in the conventional case), and the hydraulic housing 33 is lifted from the tractor body 5.

Since the liftable space 30 is formed between the hydraulic housing 3 and the floor seat 22,
3 can be easily lifted. Where lift (height)
Is that the base 36 of the hydraulic housing 33 is
This is the fitting amount (height) since the fitting is made to the (corresponding to the fitting amount of the spigot that covers the mission case 7).

The hydraulic housing 33 constituting the hydraulic elevating device 10 is lifted in the space 30 and then pulled out rearward, whereby the hydraulic elevating device 10 is detached from the tractor body 5, and the hydraulic elevating device 10 is used as a unit. Therefore, even if a failure site cannot be determined, maintenance as a unit is possible. After the maintenance, the hydraulic elevating device 10 is mounted and fixed to the tractor body 5 in the reverse operation to the above.

In the present invention, the draft control valve device 4 is provided in the hydraulic housing 33 constituting the hydraulic lift device 10.
3. Horizontal control valve device 44 and valve 3 for taking out external hydraulic pressure
Since the hydraulic housing 33 is detached (separated) from the tractor body 5 for maintenance of the hydraulic elevating device 10, the draft control valve device 43, the horizontal control valve device 44, and the external hydraulic pressure take-off valve 35 is detached from the tractor body 5 together with the hydraulic housing 33, so that maintenance thereof is also facilitated.

In particular, when an electromagnetic pilot valve in which an ascending and descending solenoid valve and a pilot switching valve are integrated is adopted as the draft control valve device 43, the maintenance frequency increases because the valve is sensitive to dust and the like. Therefore, the significance increases. In the present invention, the hydraulic housing 3 constituting the hydraulic lifting device 10
3, a main port 42 for the hydraulic lifting device 10
Is formed, and the pipe is detachably connected to the port 42 from the left and right lateral directions. Therefore, even when the main pipe is a normal steel pipe, when the screw portion of the main port 42 is fastened and loosened, It can be easily done from the side,
Serviceability and handling can be improved.

Further, in the present invention, the draft control valve device 43, the horizontal control valve device 44, the priority valve 46 and the relief valve 42 are mounted on the side wall of the hydraulic housing 33 constituting the hydraulic lifting device 10. When the hydraulic lifting device 10 is serviced, the device 1 is located on the rear side (meaning the front-rear direction of the tractor body 5).
When inserting or removing 0, the draft control valve device 43, the horizontal control valve device 44, the priority valve 46, and the relief valve 47 are less likely to become obstacles. Since 45 is formed in the hydraulic housing 33, the work of attaching and detaching the piping member is not required.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, which shows the entire configuration of a two-axis four-wheel tractor 2 according to the present invention, It has left and right front wheels 3 and left and right rear wheels 4,
The front wheel 3 is a steerable wheel and can be driven. Here, a four-wheel drive tractor is used. However, the front wheel 3 may be connected to or disconnected from the front wheel 3 to perform two-wheel drive (rear wheel drive).

The tractor body 5 is constructed by connecting a transmission case 7 to a rear portion of a mounted engine 6 via a crack housing. The engine 6 and an engine auxiliary device such as a radiator provided in front of the engine 6 are provided with a top plate. It is covered with a hood 8 that can be freely opened and closed. A hydraulic lifting device 10 having left and right lift arms 9 is mounted on the rear upper surface of the tractor body 5. In the figure, a rotary work machine 12 is detachably mounted so as to be liftable and controllable by a three-point link 11.

The left and right rear wheels 4 are covered by rear wheel fenders 13 erected inside thereof, and a driver's seat 14 is arranged between the left and right rear wheel fenders 13. A driving control device 16 is constituted by a control handle 15 provided in front of the vehicle.
Reference numeral 6 denotes an independently mounted cabin 17 (removably mounted on the vehicle body 5) including left and right rear wheel fenders 13.
Surrounded by

The cabin 17 includes a pair of left and right front supports 18,
A pair of left and right rear struts 19, an intermediate strut 20 rising from a rear wheel fender 13 between the front and rear struts 18, 19 and approaching the rear strut 19, and an air conditioner (cooling, heating, cooling / heating) , Ventilation, etc.), and the bottom plate (floor seat) 22 of the cabin 17 is such that the mounting portion 22A of the driver's seat 14 is one step higher than the front portion 22B. The hydraulic lifting device 10 is covered by the floor sheet 22 from above.

Further, the cabin 17 has a door 23 which can be opened and closed and fixed by using a pivot fitting 20A provided on the intermediate support 20 as a fulcrum. The tractor is mounted on the tractor body 5 by anti-vibration support means such as anti-vibration rubber provided on the left and right bottoms. Further, the rear support 19 of the cabin 17 is formed in an inverted shape via an intermediate bending connection 19A, and the bending connection 19A is located near a vertical plane crossing the rotation fulcrum (arm axis) of the lift arm 9. , So that the entire cabin 17 is forward (approximately 5
cm) and the center of gravity of the entire tractor 2 is shifted forward, so that even when the rotary working machine 12 is mounted to be able to move up and down, the front and rear weight balance is good, and as a result, As a whole, the tractor is made lighter and adaptable to paddy field work.

Referring to FIG. 2, the left and right rear supports 19 of the cabin 17 are mounted on a hat-shaped support 26 bolted to a rear axle case 25 by a bracket 27 and anti-vibration support means 28 on the tractor body 6. Left and right lower bodies 29 fixed to the lower end of the rear support 19.
Are extended forward and are connected to the left and right front supports 18.

That is, in the prior art, the rear bottom surfaces 29A of the left and right lower bodies 29 are mounted on the hat-shaped support base 26 via the vibration isolating support means 28. In the embodiment of the present invention,
A bracket 2 fixed to the column 19 with the lower part of the rear column 19 positioned vertically in front of the rear axle case 25.
The cabin 17 is mounted on the tractor vehicle body 5 via the anti-vibration support means 28 and the anti-vibration support means 28. The cabin 17 is located about 5 cm ahead of the conventional one, and the cabin 17 When the hydraulic lifting device 10 is detachably mounted and fixed on the upper surface of the tractor vehicle body 5 because the living space is secured even if it is located at the front position than before and the cabin 17 is mounted at the front position as compared with the conventional case. The lifting space 30 is secured.

The head portion 10A of the hydraulic lifting device 10 is covered from above by a mounting portion 22A of the floor seat 22, and a driver's seat 14 is mounted on the mounting portion 22A via a seat support 31. The driver's seat 14 can be freely attached to and detached from the mounting portion 22A together with the seat support 31.
Hydraulic lifting device 1 from above through an opening window formed in 2A
0 is fixed to the vehicle body 6 in an up-down direction, and the hydraulic lifting device 10 is lifted up from the vehicle body 6 in the space 30 and pulled out rearward. Maintenance is possible.

A hydraulic pump device 32 driven by the engine 6 is provided on the transmission case 7 in front of the hydraulic elevating device 10. The hydraulic pump device 32 is covered by a mounting portion 22A. Part 2
Maintenance can be performed together with the head unit 10A through the opening window formed in the 2A. Hydraulic pump device 32
Is driven via a PTO propulsion shaft directly connected to the output shaft of the engine 6 via a gear or the like (not shown), and the hydraulic pump device 32 is normally (conventionally) provided on a side surface of the engine 6. Since the transmission case is provided on the upper surface of the transmission case 7, the transmission case 7 itself also serves as a hydraulic oil tank, so that the piping member can be omitted or shortened. The limitation of the diagonal angle has been eliminated.

Also, the floor sheet 22 is
A is constituted by a thin plate, and the front portion 22B is constituted by a thick plate, whereby the center of gravity of the vehicle is also shifted forward. The strength is ensured by the stay for the sheet support 31 fixed to the peripheral edge of. FIG.
Referring to FIG. 5, an embodiment of a tractor 1 according to the present invention in which an external hydraulic take-out device 1 is mounted on a hydraulic elevating device 10 having left and right lift arms 9 is shown, and hydraulic pressure constituting the hydraulic elevating device 10 is shown. An oil passage 34 for taking out the external hydraulic pressure is formed in the housing (hydraulic cylinder main body) 33, and a valve 35 for taking out the external hydraulic pressure, which is connected (communicated) to the oil passage 34, is disposed above the hydraulic housing 33. It is provided between the left and right lift arms 9.

More specifically, the hydraulic housing 33
Is made of a casting, and a mounting hole 36A for the transmission case 7 is formed in the pedestal portion 36, and the arm shaft 38 for the lift arm 9 is turned around the rear left and right walls of the main body portion 37 formed in the pedestal portion 36. Left and right bosses 39 are movably supported, and a cylinder tube 40 is provided in the front inside of the main body 37 so as to be inclined upward and forward. A piston is slidably fitted to the cylinder tube 40. The opening end of the tube 40 is closed by the head lid 41, and the pedestal portion 36 of the hydraulic housing 33 is spigot-fitted with the upper opening of the transmission case 7 covered, and the pedestal portion 36 is moved up and down. It is mounted detachably with bolts.

An inlet (main) port 42 for hydraulic oil from the hydraulic pump device 32 is formed on a side wall (right side wall in the figure) of the hydraulic housing 33.
Reference numeral 2 denotes a substantially threaded pipe structure, and a steel pipe can be detachably connected to the port 42 from the left and right sides. A draft control valve device 43 and a horizontal control valve device 44 are mounted on the hydraulic housing 33 so as to be distributed to the left and right, and an oil passage 4 for these valve devices 43 and 44 is provided.
5, a priority valve 46, a relief valve 47, and the like are mounted, and when a front loader is mounted on the tractor 2, a hydraulic take-out port 48, a neutral port 49, a drain port 50, and the like for the loader are provided. Priority valve 46
The relief valve 47 is arranged on the left side wall of the hydraulic housing 33 in front and rear arrangement.

The draft control valve device 43 is an electromagnetic pilot valve in which an ascending and descending solenoid valve and a pilot switching valve are integrated, and receives signals from a draft sensor 51 and a lift arm sensor 52 as shown in FIG. The draft control is automatically enabled by a control signal from the control box 53.

The horizontal control valve device 44 transmits a signal of a rolling sensor 54 provided in the tractor body 6 shown in FIG. 6 to the control box 53, and transmits a lift cylinder (lift rod) 55 of the three-point link 11 to a stroke sensor 56. This is controlled by a signal from the controller.
In FIG. 6, the control box 53 can be set and switched freely from a switch box 57 such as draft / horizontal control switching, draft control and position control. Of course, the draft / position control can also be operated manually as described later. For this reason, a mounting hole for manual operation is opened on the right side of the hydraulic cylinder main body 33, and this opening is covered with a removable cover in automatic control (auto draft control).

The lift arm 9 has a mounting hole 9A for a telescopic hydraulic cylinder (assist cylinder) for lifting force (assisting hydraulic pressure), and a hydraulic outlet 58 for this assist cylinder is provided in the cylinder head. The head 41 has a drop adjusting valve 59
Is incorporated. The valve 35 for taking out the external hydraulic pressure is provided with a switching spool 62 in a valve case 61, and the spool 62 can be switched by the operating force of a push-pull cable 64 via a swing arm 63. The take-out section (including the hydraulic take-out and return) 35A is constituted by a quick coupler that allows the hydraulic take-out hose to be substantially detachable.

The valve 35 for taking out the external hydraulic pressure (including the valve case and the spool, the same applies hereinafter) can be directly mounted on the upper surface of the hydraulic housing 33 in communication with the oil passage 34, but in the illustrated example, Connecting oil passage 6 communicating with passage 34
Hydraulic housing 3 with spacer 60 having
3 Removably mounted on the upper part. Also, the valve 35
May be mounted, but in the illustrated example, a plurality of them are vertically stacked via an intermediate spacer 65 and a head spacer 66, and are detachably mounted by bolts 67. At the rear, which makes it easy to attach and detach the hydraulic outlet hose.

Since the oil passage 34 for the valve 35 for taking out the hydraulic pressure is formed in the hydraulic housing 33,
No exposed piping is required, and when stacking the spacer 60 and the intermediate spacer (there is also an oil passage) 65, it is possible to reliably prevent oil leakage by ensuring the positioning and sealing of the overlapped surface. Since the lift arm 9 is provided between the left and right lift arms 9, the lifting operation of the lift arm 9 does not interfere with the hydraulic take-out hose.

The hydraulic housing 33 is equipped with a top link mounting base device 69 having a torsion bar (a load sensing member, serving as a draft sensor) 68 on an upright surface, and also supplies hydraulic oil to the transmission case 7. Since the plug A and the like are provided, as shown in FIGS. 4 and 5, the valve 35 is mounted eccentrically to one side in the left and right direction, in the figure, to the left. 35 less interference,
As a result, the lift angle of the three-point link 11 (the left and right lift arms 9) is sufficiently ensured.

Referring to FIG. 7 to FIG.
A illustrates details of the spacer 60 having a seat 60B with respect to the hydraulic housing 33.
Has a plurality of bolt insertion holes 60C, the drain port 50 is formed in the seating portion 60B, and is detachably mounted on the upper surface of the hydraulic housing 33 by vertical bolts inserted into the bolt insertion holes 60C. Therefore, the valve 35 is detachable via the spacer 60 in a state where the hydraulic housing 33 is mounted on the tractor vehicle body 6.

Further, a mounting seat 60D for the valve 35 is formed on the spacer 60 so as to protrude. The valve 35 can be detachably mounted on the mounting seat 60D by a bolt 67 via an intermediate spacer 65 and a head spacer 66. From that
With the spacer 60 mounted on the hydraulic housing 33, the valve (valve unit) 35 is detachable, thereby making maintenance easier.

Referring to FIG. 14, the arm shaft 38 is inserted through a cylindrical boss penetrating the hydraulic housing 33 in the left-right direction, and is turned through left and right cylindrical bushes 70 interposed between the cylindrical boss. It is movably supported. This cylindrical bush 70 needs to be lubricated because it is severely burned by micro vibrations. In this embodiment, the draft control valve device 43 and the horizontal control valve device 44
3 are distributed on the left and right side walls.
A pipe member 71 is loosely connected to the return oil port (tank port) of the draft control valve device 43 to partially return oil to the pipe member 7.
1 to the right bush 70 and the bush 70
On the other hand, a piping member 72 is loosely connected to the return oil port (tank port) of the horizontal control valve device 44 and a part of the return oil is passed through the piping member 72 to the left bush 70.
To the bush 70 and semi-forced lubrication of the bush 70 to
As shown in FIG. 14, an O-ring 73 and a collar 74 are provided on the outside of the bush 70 to prevent return oil from leaking to the outside. The remaining oil that has formed the oil film is returned to the transmission case 7.

When a draft control valve which is mechanically operated (manually operated) is provided on the right side of the piping member 71 instead of the draft control valve device (auto draft), the draft control valve is provided. Is loosely connected to the tank port. Here, since the piping members 71 and 72 are loosely connected to the tank port, a part of the return oil returns into the transmission case via the loose insertion connection portion, and the remaining return oil passes through the piping members 71 and 72. The left and right bushings 70 are semi-forced lubricated through the above. As described above, a draft control valve (including an automatic or mechanical) and a horizontal control valve are provided on the left and right sides of the hydraulic housing, respectively. By interposing the piping members 71 and 72 in the ports, seizure of the bush 70 is prevented, and the piping members 71 and 72 are also connected to the hydraulic housing 3.
It is sufficient to dispose them in the front-rear direction in the form covered by step 3, and the piping of the piping members 71 and 72 is also facilitated.

The piping members 71 and 72 may be formed in the hydraulic housing 33 in a hole shape. The hydraulic housing 33 includes an oil passage 34 for taking out an external hydraulic pressure and oil passages for the valve devices 43 and 44. By forming the hydraulic housing 33 and the like, the hydraulic housing 33 has a large capacity, but is lightened, and the hydraulic lifting device 10 in the tractor for paddy fields is used.
Is significant.

FIGS. 15 to 18 show the canopy (shading).
The present invention is applied to the tractor 2 having the above-described configuration 75, and the draft control valve device is mechanical (manual). Portions common to the above-described configurations are denoted by common reference numerals, and different configurations will be described below. FIG.
5, in FIG. 16, the canopy 75 is inserted into the lower support 75A, which is erected from the left and right rear axle housing 25 to the vicinity of the upper surface of the fender 13, in a nested configuration above and below the lower support 75A. , Bolt fastener 7
5C and an upper support 75B mounted by 5C.

The valve 35 for taking out the external hydraulic pressure stacked on the hydraulic housing 33 is connected to the Bowden cable 6.
The remote control lever 76 is provided on the floor seat 22 on the right side of the driver's seat 14 on the lateral pivot shaft 7.
7, a window is formed in a step portion (rise surface) 22 </ b> C of the floor sheet 22, and a lever 76 projects from the window.

A bracket 78 is bolted to the step 22C so as to reinforce the left and right sides of the window of the step 22C. The bracket 78 is provided with a pivot shaft 77, and the cylindrical portion at the root of the lever 76 is pivoted. The cable 63 is rotatably fitted on the support shaft 77, and the cable 63 is connected to the arm formed on the cylindrical portion via a metal fitting 79.
Extends from the right side to the left above the hydraulic housing 33, bypassing the back of the driver's seat 14 (the operation lever 7).
6 and the like are also adopted in the embodiments of FIGS. 1 to 14).

In place of the automatic draft control device, there is provided a hydraulic control lever device 80 which is manually operated (manually operated). This lever device 80 comprises a position lever 81 and a draft lever 82, and includes a hydraulic housing. A support arm 84 that inserts and supports a control shaft 83, which is an inner / outer dual shaft, is projected rightward and outward so as to close an opening formed on the right side of the 33 (slightly behind the auto-draft control valve). Shaft 83 is connected to levers 81 and 8
The valve is rotated by the front-back operation 2 to control a valve housed in the hydraulic housing 33.

In FIGS. 16 and 17, reference numeral 85 denotes a differential lock petal, and front and rear wheels are arranged side by side so that they can be freely depressed. The present invention described above can also be applied to the tractor 2 not having the cabin 17 and the canopy 75 (however, having the floor seat 22). It can be stacked in any direction.

Further, with respect to the draft control valve device, particularly in the case of the automatic draft control valve, the maintenance opportunity is increased. Therefore, the application of the present invention to the draft control valve is significant. Is also significant.

[0044]

As described in detail above, according to the present invention, the hydraulic lifting device covered with the floor sheet can be lifted from the tractor body, and maintenance can be performed satisfactorily.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor according to the present invention.

FIG. 2 is an elevational view of a rear part of the tractor.

FIG. 3 is a side view of a tractor according to the present invention in which a hydraulic lifting device having an external hydraulic take-out device is mounted.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a rear view of a main part of FIG. 3;

FIG. 6 is a configuration diagram of a hydraulic circuit.

FIG. 7 is a plan view of a spacer.

FIG. 8 is a front view of a spacer.

FIG. 9 is a side view of the spacer.

FIG. 10 is a sectional view taken along line AA of FIG. 7;

FIG. 11 is a sectional view taken along line BB of FIG. 7;

FIG. 12 is a sectional view taken along line DD of FIG. 7;

FIG. 13 is a sectional view taken along line EE of FIG. 7;

FIG. 14 is a cross-sectional view of the hydraulic lifting control device.

FIG. 15 is a side view showing another type of tractor to which the present invention is applied.

FIG. 16 is a side view of a main part of FIG.

FIG. 17 is a plan view of a main part in FIG. 15;

18 is a rear (rear) view of a main part of FIG.

[Description of Signs] 2 Tractor 9 Lift arm 10 Hydraulic lifting device 22 Floor seat 30 Space 33 Hydraulic housing 34 Oil passage 35 Hydraulic take-out valve 43 Draft control valve device 44 Horizontal control valve device

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Toshinobu Owada 64 Ishizukitamachi, Sakai City, Osaka Prefecture Inside the Kubota Sakai Plant (72) Inventor Toshimitsu Yazaki 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. Inside

Claims (4)

[Claims] A floor seat (22) is provided so as to cover a hydraulic lifting device (10) for a working machine mounted on a rear portion of a tractor body (5), and a rear side of the hydraulic lifting device (10) is provided. In a tractor (2) configured in an open state, a hydraulic lifting device (10) is provided between the tractor (2) and a floor sheet (22).
A liftable space (30) is provided for detaching the hydraulic lift from the tractor body (5).
A tractor characterized in that the tractor (0) is configured to be able to be inserted and removed from the rear side. 2. A draft control valve device (43), a horizontal control valve device (44) and a valve (3) for taking out an external hydraulic pressure are provided in a hydraulic housing (33) constituting a hydraulic lifting device (10).
The tractor according to claim 1, wherein (5) is mounted. 3. A main port (42) for the hydraulic elevating device (10) is formed in a hydraulic housing (33) constituting the hydraulic elevating device (10).
The tractor according to claim 1, wherein a pipe is detachably connected to the left and right lateral directions. 4. A draft control valve device (43), a horizontal control valve device (44), a priority valve (46) and a relief valve (42) are formed on a side wall of a hydraulic housing (33) constituting a hydraulic elevating device (10). The tractor according to claim 1, wherein the tractor is mounted on a part.