JP2001136809A - External hydraulic pressure takeout apparatus for tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve maintenance of external hydraulic pressure takeout apparatus and to suppress interference of hydraulic hose with a lift arm, etc. SOLUTION: A hydraulic route 34 is formed in a hydraulic housing 33 constituting a hydraulic pressure increasing and reducing apparatus 10 having the lift arm 9. The hydraulic housing 33 is equipped with an external hydraulic pressure takeout valve 35 communicating with the hydraulic route 34. The valve 35 is arranged closer to either side of the right and left lift arms 9 and a hydraulic pressure takeout port 35A passing through the valve 35 is installed at the side and oriented outward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an external hydraulic take-out device for a tractor.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 11-59213 discloses that a tractor provided with a hydraulic lift device having left and right lift arms and an external hydraulic take-out device is mounted on the tractor. Forming an oil passage for taking out the external hydraulic pressure, and providing a valve for taking out the external hydraulic pressure connected to the oil passage between the left and right lift arms at an upper portion of the hydraulic housing; Hydraulic take-out device "(conventional example).

In this conventional example, since the oil passage for taking out the external hydraulic pressure is formed in the hydraulic housing, the piping member does not become so-called (exposed) and the valve is provided between the lift arms, so that the maintenance is performed. There are advantages such as that it becomes easy.

[0004]

In the above-mentioned conventional example, although its usefulness is recognized, there are the following problems. That is, the tractor is detachably mounted with various working machines via link device means (link direct mounting means) such as a three-point link. Therefore, the tractor has a top link and a mounting base (top link bracket). Etc. are provided. In the conventional example, a hydraulic outlet through a valve for external hydraulic outlet is extended rearward,
A hydraulic hose or the like is joined to or separated from the hydraulic outlet by a coupler or the like.

However, since the hydraulic hose and the like are connected in a long and flexible curved form, there is a problem that the hydraulic hose interferes with the top link, the mounting base and the lift arm. Accordingly, an object of the present invention is to provide an external hydraulic pressure take-out device for a tractor capable of preventing interference with a hydraulic hose, which is a problem of the conventional example, while securing the usefulness of the above-described conventional example.

[0006]

According to the present invention, an external hydraulic take-out device 1 is provided between left and right lift arms 9 provided on a tractor 2.
The following technical measures are taken in order to achieve the above-mentioned object in the case where the valve 35 is mounted. That is, the present invention according to claim 1 is characterized in that a hydraulic outlet 35A via the valve 35 is provided on one of the right and left sides and directed outward.

According to a second aspect of the present invention, the valve 35 is disposed so as to be offset to one of the left and right lift arms 9, and the hydraulic outlet 35A passing through the valve 35 is connected to the valve 35. It is characterized by being provided on one side and facing outward. According to the first and second aspects of the present invention, when the hydraulic hose is joined to the hydraulic outlet 35A with a coupler or the like, the plug attached to the outlet 35A is connected. After removal, the hydraulic hose can be easily joined from the rear side of the tractor 2. Further, the joined (connected) hydraulic hose is less likely to interfere with the lift arm 9 and / or the top link 11A and the mounting base (mounting base apparatus) 69, and the lift angle (eg, the lift angle ( The vertical movement range is not restricted.

According to claim 1 or 2, it is recommended that the hydraulic outlet 35A be provided between one of the lift arms 9 and the top link mount 69 (claim 3). Thus, the hydraulic outlet 35A is connected to the lift arm 9.
By providing between the and the top link mount 69, the joining / separating work of the hydraulic hose (including the attachment / detachment of the plug to / from the attachment port 35A) can be further simplified.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the entirety of a two-shaft, four-wheel tractor 2 equipped with an external hydraulic take-out device 1 according to the present invention. In FIG. 1, the tractor 2 includes left and right front wheels 3 and left and right rear wheels 4, and the front wheels 3 are steerable wheels and are drivable. Here, a four-wheel drive tractor is used. The front wheels 3 can be connected to and disconnected from each other 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 7A. The engine 6 and an engine auxiliary device such as a radiator provided in front of the transmission case 7 are equipped with a top plate. Is covered with a hood 8 which 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 three-point link 11 composed of one central top link 11A and left and right lower links 11B is provided. The rotary working machine 12 is detachably mounted so as to be capable of elevating and lowering.

The left and right rear wheels 4 are covered by rear wheel fenders 13 erected inside thereof, and a driver's seat 14 is disposed 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 struts 18, a pair of left and right rear struts 19, and front and rear struts 1.
An intermediate post 20 rising from the rear wheel fender 13 which is located between the rear end of the rear wheel fender 13 and located between the rear end of the rear wheel fender 13 and the air conditioner (cooling,
The cabin 17 has a bottom plate (floor sheet) 22 in which the mounting portion 22A of the driver's seat 14 is one step lower than the front portion 22B thereof. Is getting higher.

Further, the cabin 17 has a door 23 which can be opened and closed by using a pivot fitting 20A provided on the intermediate support 20 as a fulcrum. It is mounted on the tractor vehicle body 6 by vibration isolating support means such as rubber 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 FIGS. 2 (1), 2 (2) and 2 (3), the tractor body 5 has an intermediate transmission case 7B interposed between a clutch housing 7A and a transmission case 7 and a rear wheel fender. A reflector device 70 is provided on 13. That is, the fender 13
A long recess (groove) is formed in the upper surface in the front-rear direction, and a stay 71 is fitted and positioned in this recess, and is detachably attached with a bolt or the like. The rear end of the stay 71 is bent downward, and a U-shaped receiving cylinder 72 is fixed to the bent portion in a plan view.

The reflecting plate 71A has a reflecting surface formed in the shape of a rhombus or a pentagon, and an insertion stay 73 is fixed to the back surface (front surface) of the reflecting plate 71A. By inserting and removing the reflection plate 71A from the fender 13 in a substantially vertical posture,
Is detachably held at the rear of the vehicle, and the presence of the tractor 2 is notified to a following vehicle or the like during night driving. Further, in FIG. 2A, the left and right rear supports 19 in the cabin 17 are mounted on a hat-shaped support stand 26 bolted to a rear axle case 25, and mounted on the tractor body 5 by a bracket 27 and anti-vibration support means. Left and right lower bodies 29 fixed to the lower end of the rear support 19 extend forward and are connected to the left and right front support 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 26 via the vibration isolating support means 28, but 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 the 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 5 in an up-down direction so that the hydraulic lifting device 10 can be tightened and loosened. Maintenance is possible.

The engine 6 is mounted on the transmission case 7 or the intermediate transmission case 7A in front of the hydraulic lifting device 10.
The hydraulic pump device 32 is driven by the hydraulic pump device 32. The hydraulic pump device 32 is covered by the mounting portion 22A and can be maintained together with the head portion 10A through an opening window formed in the portion 22A. ing. The 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). The hydraulic pump device 32 is normally (conventional)
In this case, by providing what is provided on the side surface of the engine 6 on the upper surface of the transmission case 7, since the transmission case 7 itself also serves as a hydraulic oil tank, the piping member can be omitted or shortened, and When the vehicle is provided on the side, the limitation on the steering angle of the front wheel 3 is also eliminated.

Further, 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.
5 to FIG. 5, there is shown an embodiment in which an external hydraulic take-out device 1 according to the present invention is mounted on a hydraulic elevating device 10 having left and right lift arms 9, and a hydraulic housing (hydraulic) constituting the hydraulic elevating device 10 is shown. An oil passage 34 for taking out the external hydraulic pressure is formed in the cylinder body 33, and a valve 35 for taking out the external hydraulic pressure which is connected (communicated) to the oil passage 34.
Is provided above the hydraulic housing 33 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. 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 in a state where the hydraulic housing 33 covers the upper opening of the transmission case 7 is mounted detachably with vertical bolts. I have.

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.
Numeral 2 has a substantially threaded pipe configuration, and a pipe can be detachably connected to the port 42. The hydraulic housing 33 includes a draft control valve device 43 and a horizontal control valve device 4.
The oil passage 45 for these valve devices 43 and 44, the priority valve 4
6, while the relief valve 47 and the like are mounted,
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.

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 5 shown in FIG.
The lift cylinder (lift rod) 55 is controlled by a signal from a stroke sensor 56 or the like.

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, manual operation is also possible for draft / position control. A mounting hole for manual operation is opened on the right side of the, and this opening is covered with a removable cover when automatic control (auto draft control) is performed. The lift arm 9 has a telescopic hydraulic cylinder (assist cylinder) for lifting force (assisting hydraulic pressure enhancement).
A hydraulic outlet 58 for this assist cylinder is formed in the cylinder head 41, and a drop adjusting valve 59 is incorporated in the head 41.

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 hydraulic take-out section (including the hydraulic take-out and return) 35A has a detachable plug at this hydraulic take-out port, and is provided with a quick coupler and the like that makes the hydraulic take-off hose 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,
In the illustrated example, it is detachably mounted on the upper part of the hydraulic housing 33 with a spacer 60 having a communication oil passage 60A communicating with the oil passage 34 interposed therebetween.

One of the valves 35 may be mounted. In the illustrated example, a plurality of valves 35 are vertically stacked via an intermediate spacer 65 and a head spacer 66, and are detachably mounted by bolts 67. The hydraulic outlet 35A extends rearward on a horizontal plane, so that the hydraulic outlet hose can be easily attached and detached. Since the oil passage 34 for the valve 35 for taking out the hydraulic pressure is formed in the hydraulic housing 33, an exposed pipe is not necessary outside, and when the spacer 60 and the intermediate spacer 65 (there is also an oil passage) 65 are stacked. Oil leakage can be reliably prevented by ensuring the positioning and sealing of the overlapped surface, and since it is provided between the left and right lift arms 9, the lifting and lowering operation of the lift arms 9 is not hindered together with the hydraulic extraction hose. It is not.

The hydraulic housing 33 is equipped with a top link mount 69 having a torsion bar (a load sensing member and a draft sensor) 68 on its upright surface. 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.

More specifically, with reference to FIGS. 3 to 5, the valve 35 is provided with a spool 62 in the valve case so as to be slidable in a horizontal direction (on a horizontal plane). The hydraulic outlet (including supply / discharge) 35A through which the pipe is extended rearward, one lift arm (left side in the figure) 9 and the top link mount 6
9 and is directed outward (outward left).
Further, since the hydraulic outlet 35A extends rearward of the top link mounting base 69, the work of attaching and detaching the hydraulic hose and the like is easy, and there is no interference with the top link 11A. By standing this on the vehicle body 5 side and supporting it with the holder 74, there is no interference with a hydraulic hose or the like connected to the outlet 35A. Further, since the valve 35 itself is also offset toward the lift arm 9 on the left side, and the outlet 35A is directed toward the offset side, there is no additional interference, and furthermore, the attachment and detachment of the hydraulic hose and the like. Has also become easier.

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 with the hydraulic housing 33 mounted on the tractor vehicle body 5.

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. Although the embodiments of the present invention are as described above, various changes can be made to the embodiments of the present invention.

For example, the present invention can be applied to a tractor having a canopy (shade) instead of the cabin 15 or to a tractor having no cabin or canopy. Further, the valves 35 can be stacked not only in the illustrated vertical direction but also in the horizontal direction. Furthermore,
As for the draft control valve device, particularly in the case of the auto-draft control valve, the maintenance opportunity is increased, so that the application of the present invention is significant, but the draft control valve for manual operation is also significant.

[0030]

As described above in detail, according to the present invention, it is possible to easily take out the external hydraulic pressure and to perform the maintenance easily, while eliminating the interference with the lift arm, the top link and the like.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor provided with an external hydraulic take-out device according to the present invention.

2A is an elevation view of a rear portion of the tractor, FIG. 2B is a rear view of the reflecting mirror device, and FIG. 2C is a partial plan view thereof.

FIG. 3 is a side view of a hydraulic elevating device having an external hydraulic take-out device according to the present invention.

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;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 External hydraulic take-out device 2 Tractor 9 Lift arm 10 Hydraulic elevating device 33 Hydraulic housing 34 Oil passage 35 Hydraulic take-off valve 35A Hydraulic take-out 69 Top link mounting base

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Koji Minogata, inventor 64 Ishizukita-cho, Sakai-shi, Osaka F-term in Kubota Sakai Works (reference) 2B304 KA10 LA02 LA05 LB05 LB15 MA02 MB02 PD20 3D037 CA01 CB06 CB15 CB19 CB23

Claims (3)

[Claims] A valve (3) of an external hydraulic take-off device (1) is provided between left and right lift arms (9) provided on a tractor (2).
5) a hydraulic outlet (35A) via the valve (35);
Tractor external hydraulic take-out device, which is provided on one of the right and left sides and is directed outward. 2. A valve (3) of an external hydraulic take-out device (1) between left and right lift arms (9) provided on a tractor (2).
5), wherein the valve (35) is arranged so as to be offset to one of the left and right lift arms (9), and a hydraulic outlet (35A) via the valve (35). The tractor external hydraulic pressure take-out device is provided on one side and facing outward. 3. The tractor according to claim 1, wherein the hydraulic outlet (35A) is provided between one of the lift arms (9) and the top link mount (69). External hydraulic take-out device.