JP2006016764A - Quick coupler device of work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the overhung amount of a working device to its outer end with connection parts between a quick coupler device and the working device and enable the connection parts to be able to connect the work device on the lateral outer side thereof in the quick coupler device installed on a pair of working device support members on the lateral both sides of the work vehicle. <P>SOLUTION: This quick coupler device 10 comprises a pair of support member connection parts 20 and 20 installed on the pair of working device support members 8 and 8 disposed at an interval in the lateral direction of the work vehicle 2 and the pair of working device connection parts 20 and 20 which are positioned on the lateral outside of the pair of support member connection parts 20 and 20 and to which the working device 12 is detachably installed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a quick coupler device that is a quick attachment / detachment device for a work tool, which is installed in a work vehicle such as a wheel loader.

A wheel loader equipped with a lift arm as a work tool support member, which is a typical work vehicle, can perform various work by exchanging various work tools at the tip of the lift arm. Therefore, a quick coupler device, which is a quick attachment / detachment device that can quickly attach / detach various work tools, has been developed and put into practical use (see, for example, Patent Document 1). By using this quick coupler device, various types and sizes of work tools, for example, buckets of different shapes and sizes, can be exchanged as appropriate according to the type of work so that various tasks can be performed efficiently with a single wheel loader. Can be carried out well economically.

A typical example of a quick coupler device (see, for example, Patent Document 1) is provided with pins at the tips of a pair of lift arms arranged at predetermined intervals in the left-right width direction of a wheel loader. Can be attached and detached freely by means such as a hook.
JP 2003-247245 A (FIGS. 3 and 4)

However, the conventional quick coupler apparatus having the above-described configuration has the following problems to be solved.

That is, a pair of left and right lift arms equipped with a quick coupler device in a typical wheel loader are respectively disposed inside the left and right wheels (wheels). On the other hand, a working tool such as a bucket is positioned such that the outer side in the left-right width direction is substantially the same as the outer side of the left and right wheels.

That is, since the outer end of the bucket overhangs outward from this connecting portion with respect to the connecting portion between the lift arm and the bucket, the connecting portion between the lift arm and the bucket by the work load acting on the outer end of the bucket, In addition, an excessive force acts on the overhang portion of the work tool. Accordingly, there is a need for reinforcement for ensuring the strength of these portions, and there is a problem that the reinforcement causes the quick coupler device and the work tool to become heavy and the work performance of the work vehicle is lowered.

On the other hand, in a skid steer loader known as a compact loader in which a pair of left and right lift arms are disposed at substantially the same position as the left and right wheels, the connecting portion between the lift arm and the work tool is located on the outer end side in the left-right width direction. ing. Therefore, the work tool attached to the skid steer loader via the quick coupler device cannot be commonly used for the wheel loader in which the above-described lift arm is disposed inside the wheel in the left-right width direction.

The present invention has been made in view of the above-described facts, and a technical problem thereof is a quick coupler apparatus and a work tool provided in a pair of work tool support members positioned on both sides in the left-right width direction of the work vehicle. A quick coupler device for a work vehicle that can reduce the amount of overhang to the outer end of the work tool with respect to the connecting part with the work tool and that can connect a work tool with the connecting part positioned outside in the left-right width direction. .

According to the present invention, as a quick coupler apparatus for removably attaching a work tool to a work tool support member of a work vehicle, which solves the above technical problem, a pair of the work vehicles arranged at intervals in the left-right width direction of the work vehicle. A pair of support member connecting portions attached to each of the work tool supporting members, and a pair of work tool connecting portions that are located outside the pair of support member connecting portions in the width direction and to which the work tools are detachably attached. A quick coupler device for a work vehicle is provided.

Preferably, each of the work tool connecting portions is located on one end side in a direction orthogonal to the width direction and is disposed on the other end side, and a convex portion that is detachably inserted into the recess of the work tool. A locking pin that is detachably inserted into the engagement hole of the work tool, and is arranged to be movable in the orthogonal direction, and a pin moving means for freely moving the locking pin. Each of the support member connecting portions is swingably connected to each of the work tool support members around the same axis extending in the width direction, and each of the support member connecting portions is interposed between each of the support member connecting portions. Swing driving means of the work vehicle that is integrally connected by the connecting material extending in the width direction and swings the quick coupler device about the axis is attached to the connecting material.

Further, the quick coupler apparatus includes a substrate extending in the width direction, and at least three of the substrates extending in the orthogonal direction in parallel with each other at intervals in the width direction on both sides of the substrate in the width direction. Each supporting plate is provided on each of the two supporting plates located on the outer side in the width direction, and each of the two supporting plates located on the inner side in the width direction. A connecting portion is provided. The substrate also includes a notch portion that forms a space between the support member connection portion and work tool connection portion on one side in the width direction and the support member connection portion and work tool connection portion on the other side.

The work vehicle includes a pair of wheels on both sides in the left-right width direction, and each of the pair of support member connecting portions is located inside each of the pair of wheels in the width direction.

The quick coupler apparatus configured in accordance with the present invention includes a pair of work tools in which a work tool is connected to the outside of each of a pair of support connection parts connected to a pair of work tool support members of the work vehicle in the width direction of the work vehicle. Accordingly, the amount of overhang to the outer end of the work tool with respect to the connection part between the quick coupler device and the work tool can be reduced. In addition, since the work tool connecting portion is located on the outside, it is also possible to connect a work tool whose connecting portion is located on the outside in the left-right width direction.

Hereinafter, a quick coupler apparatus constructed according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment of a wheel loader which is a typical work vehicle.

The wheel loader equipped with the quick coupler device will be described with reference to FIG. 1 which is a side view and FIG. 2 which is a partial perspective view thereof. The wheel loader indicated by the whole number 2 includes a refractive steering type vehicle body in which a front vehicle body 4 and a rear vehicle body 5 are refractorably connected, and a front vehicle body in a left-right width direction (perpendicular to the plane of FIG. 1) of the vehicle body. 4 includes a pair of wheels 6 and 6 attached to both sides of the vehicle 4 and a pair of wheels 7 and 7 attached to both sides of the rear vehicle body 5. The front vehicle body 4 is provided with lift arms 8 and 8 that are integrally disposed at intervals in the left-right width direction, which is a work tool support member that is freely swingable in the vertical direction. A quick coupler device 10 is provided at the tip of the lift arms 8, 8.

The pair of lift arms 8, 8 are positioned between the front vehicle body 4 and the pair of wheels 6, 6, respectively, in the left-right width direction. As will be described in detail later, the work tool 12 is attached to and detached from the quick coupler device 10 mounted on the lift arms 8 and 8. The work tool 12 in FIG. 1 is shown in a form that does not specify various work tools, except for a connecting portion with the quick coupler device 10.

The rear vehicle body 5 is provided with a driver's cab 16 in which a driver's seat 14 is provided, and an engine compartment 18 in which a power source such as an engine and a hydraulic pressure source is accommodated at the rear end.

The quick coupler device 10 is a pair of lift arms 8 and 8 attached to each of the pair of lift arms 8 and 8 arranged at intervals in the left-right width direction of the wheel loader 2 (the direction perpendicular to the paper surface of FIG. 1, the arrow X direction of FIG. 2). The support member connecting portions 20 and 20 and a pair of work tool connecting portions 22 and 22 that are located outside the support member connecting portions 20 and 20 in the width direction X and to which the work tool 12 is detachably attached are provided. .

The quick coupler apparatus 10 will be described with reference to FIG. 3 which is an enlarged view of the quick coupler apparatus 10 shown in FIG. 2 together with FIGS. Each of the work tool connecting portions 22, 22 is positioned on one end side (upper end side in FIG. 3) in the arrow Y direction orthogonal to the width direction X and is detachably inserted into the recess 12 a (FIG. 1) of the work tool 12. The protrusion 22a is disposed on the other end side (the lower end side in FIG. 3) and is movably disposed in the orthogonal direction Y that is detachably inserted into the engagement hole 12b (FIG. 1) of the work tool 12. And a hydraulic cylinder 23 as a pin moving means for freely moving the locking pin 22b.

Each of the support member connecting portions 20 and 20 is located on the side of the locking pin 22b (the lower side in FIG. 3) in the orthogonal direction Y, and the lift arms 8 and 8 are respectively centered on the same axis line XX extending in the width direction X. Are provided with bearing holes 21 that are swingably connected by pins (not shown).

Further description will be given with reference to FIG. 4 together with FIGS. The quick coupler apparatus 10 includes a coupler frame 24 as a main body, and the coupler frame 24 includes a substrate 26 extending in the width direction X, and the both sides of the substrate 26 in the width direction X are spaced apart from each other in the width direction X. Three support plates 28 a, 28 b, 28 c that extend in parallel in the orthogonal direction Y and are integrally provided are sequentially provided from the outer side to the inner side in the width direction X. The work tool connecting portion 22 is disposed between the two outer support plates 28a and 28b, and the support member connecting portion 20 is disposed at the two inner support plates 28b and 28c.

The convex portion 22a is formed by the support plates 28a and 28b, a rectangular plate 28d passed to the tip thereof, and the substrate 26. On the other end side of the support plates 28a and 28b, a cylindrical body 36 that extends in the orthogonal direction Y and through which the locking pin 22b is freely inserted is provided.

Each of the support member connecting portions 20 and 20 is integrally connected by a connecting member 30 extending in the width direction X therebetween. The connecting member 30 is formed by bending a plate material into a chevron cross section, and is put on the substrate 26 and integrally joined thereto. A tilt link 9 (FIGS. 1 and 2) as a swing drive means of the wheel loader 2 for swinging the quick coupler device 10 about the axis XX is attached to the center of the connecting member 30 in the width direction X. The swing member connecting portion 32 is integrally provided. In the swing member connecting portion 32, two plate members 32a, 32a are erected at intervals in parallel, and a pin insertion hole for connecting the tilt link 9 is formed at the tip.

In the width direction X, the substrate 26 includes a notch portion S in which the left and right portions of the support member connecting portion 20 and the work tool connecting portion 22 and the portion surrounded by the lower connecting material 30 are notched.

The cylinder 23a is supported by a bolt 34 between support plates 28a and 28b, and the cylinder rod 23b is provided in a coupler frame 24 between the support plates 28a and 28b. It is connected to the aforementioned locking pin 22b that is movably inserted through the cylindrical body 36. The hydraulic cylinder 23 is expanded and contracted by the hydraulic oil in the engine compartment 18 being supplied and discharged by the operation of the driver 14 (FIG. 1) of the wheel loader 2, and the locking pin 22 b protrudes from the coupler body 24 ( 3) and a position retracted in the coupler frame 24.

The quick coupler apparatus 10 configured as described above will be described with reference to FIG. 1. The lift arms 8 and 8 are interposed between the front vehicle body 4 and the lift arms 8 and 8 by the operation of the driver of the wheel loader 2. It is moved in the vertical direction indicated by the arrow Z1 by the cylinders 38, 38, and the tilt link 9 is moved in the front-rear direction by the tilt cylinder 40 interposed between the front body 4 and the arrow Z2 about the axis XX. It is swung in the front-back direction shown.

In order to attach the work tool 12 to the quick coupler device 10 mounted on the lift arms 8, 8, the operation tool connecting part 22 of the quick coupler device 10 is operated in the driver's seat 14 in the vertical direction Z1 position and the forward / backward swing direction. The Z2 position is adjusted, and the convex portion 22a (FIG. 2) of the work tool connecting portion 22 is engaged with the concave portion 12a of the work tool 12, and then the locking pin 22b (FIG. 2) is inserted into the engagement hole 12b of the work tool 12. This is done by inserting. In order to remove the work tool 12 from the quick coupler apparatus 10, the reverse procedure may be performed.

The operation of the quick coupler apparatus 10 for a work vehicle as described above will be described mainly with reference to FIGS.

The quick coupler apparatus 10 mounted on the lift arms 8 and 8 serving as a pair of work tool support members positioned on both sides in the left-right width direction X of the wheel loader 2 that is a work vehicle is arranged at intervals in the left-right width direction X. A pair of support member connecting portions 20, 20 attached to each of the provided lift arms 8, 8, and the work tool 12 is attached to and detached from the pair of support member connecting portions 20, 20 in the width direction X. A pair of work tool connecting portions 22 and 22 that are freely attached is provided. Therefore, since the work tool connecting portions 22 and 22 are provided outward in the width direction X with respect to the support member connecting portions 20 and 20, the work tool outer end with respect to the connecting portion 22 between the quick coupler apparatus 10 and the work tool 12 is also provided. The amount of overhang can be reduced. Moreover, the work tool in which the connection part 22 is located in the outer side of the left-right width direction can also be connected.

The quick coupler device 10 and the work tool 12 can be easily attached and detached by engaging and disengaging the convex portion 22a and the locking pin 22b of the quick coupler device 10 with the concave portion 12a and the engagement hole 12b of the work tool 12, respectively. It can be done quickly.

The quick coupler apparatus 10 is formed by integrally connecting the support member connecting portion 20 and the work tool connecting portion 22 formed by the left and right support plates 28a, 28b, and 28c by the connecting material 30 and the substrate 26. Simple. Therefore, it can be provided at low cost.

Since the notch S is provided in the substrate 26 between the left and right support member connecting portions 20 and the work tool connecting portion 22, a good field of view of the work tool 12 from the driver's seat 14 is secured, and the work tool is secured. 12 can be attached and detached more easily.

As mentioned above, although this invention was demonstrated in detail based on the Example, this invention is not limited to said Example, A various deformation | transformation or correction is possible within the scope of the present invention.

For example, in this embodiment, the locking pin 22b that is removably inserted into the engagement hole 12b of the work tool 12 is operated by the hydraulic cylinder 23 as the moving means, but for example, frequent attachment / detachment is not required. In this case, a moving means that can be operated by a manual operation lever or the like instead of the hydraulic cylinder 23 may be used.

1 is a side view of a wheel loader, which is a typical work vehicle equipped with a quick coupler device constructed according to the present invention. The explanatory perspective view which showed the part of the lift arm which is a working tool support member of a wheel loader, and the quick coupler apparatus of FIG. 1 in the isolation | separation state. The enlarged view of the quick coupler apparatus of FIG. FIG. 4 is a detailed view of the quick coupler frame of FIG. 3, (a) is a front view, (b) is a plan view as viewed in the direction of arrow A in (a), and (c) is a side view as viewed in the direction of arrow B in (a). Figure

Explanation of symbols

2: Wheel loader (work vehicle)
8: Lift arm (work tool support member)
10: Quick coupler device 12: Work tool 20: Support member connecting part 22: Work tool connecting part

Claims (6)

A quick coupler device for detachably attaching a work tool to a work tool support member of a work vehicle,
A pair of support member connecting portions attached to each of the pair of work tool support members disposed at intervals in the left-right width direction of the work vehicle;
A quick coupler apparatus for a work vehicle, comprising: a pair of work tool connection portions that are positioned outward of each of the pair of support member connection portions in the width direction and to which work tools are detachably attached. Each of the work tool connecting portions is located on one end side in a direction orthogonal to the width direction and is detachably inserted into the recess of the work tool, and is located on the other end side of the work tool. The work vehicle according to claim 1, further comprising: a locking pin that is detachably inserted into the engagement hole, and is movably disposed in the orthogonal direction; and a pin moving unit that moves the locking pin freely. Quick coupler device. Each of the support member connecting portions is swingably connected to each of the work tool support members about the same axis extending in the width direction, and each of the support member connecting portions has a width between them. The work vehicle according to claim 1 or 2, wherein the working vehicle swing drive means is integrally connected by a connecting member extending in a direction and swings the quick coupler device about the axis, and is attached to the connecting member. Quick coupler device. A substrate extending in the width direction, and at least three support plates provided integrally with the substrate extending in the orthogonal direction at intervals in the width direction on both sides of the substrate in the width direction; The work tool connecting portions are disposed on the two support plate portions positioned on the outer side in the width direction, and the support member connecting portions are disposed on the two support plate portions positioned on the inner side in the width direction. The quick coupler apparatus for a work vehicle according to any one of claims 1 to 3. The substrate includes a notch portion that forms a space between the support member connection portion and work tool connection portion on one side in the width direction and the support member connection portion and work tool connection portion on the other side. Item 5. A quick coupler device for a work vehicle according to Item 3 or 4. The work vehicle is provided with a pair of wheels on both sides in the left-right width direction, and each of the pair of support member connecting portions is located inside each of the pair of wheels in the width direction. A quick coupler device for a work vehicle according to any one of items 1 to 5.

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