JP3509453B2 - Outrigger device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outrigger device for supporting a body of a self-propelled working machine such as a wheel crane, which is extended in a telescope shape.

[0002]

2. Description of the Related Art A conventional outrigger device will be described with reference to FIGS.

Here, an outrigger device of a wheel crane (only one of the left and right sides is shown) is taken as an example.

Reference numeral 1 is a carrier frame, 2 is a rectangular tubular outrigger box horizontally fixed to the carrier frame 1, an outrigger beam 3 is slidably inserted into the outrigger box 2, and a slide cylinder (not shown) is used to move the outrigger box. The beam 3 is projected and stored like a telescope.

Reference numeral 4 denotes a jack cylinder provided at the tip of the outrigger beam 3. The jack cylinder 4 is extended in a beam overhang state, and a grounding body (float) 5 provided at the lower end of the jack cylinder 4 is grounded (jacked up). As a result, the airframe is lifted and supported.

[0006]

In such an outrigger device, in order to slide the outrigger beam 3 with respect to the outrigger box 2, a predetermined gap is provided between the inner surface of the outrigger box 2 and the outer surface of the outrigger beam 3. It is necessary to secure c.

On the other hand, in the wheel crane, there is a demand for making the outrigger extension stroke as large as possible within the limited vehicle width, so that the overlapping dimension M of the outrigger box 2 and the outrigger beam 3 in the extended state cannot be made large.

Due to these two points, as shown in FIG. 11, the outrigger beam 3 is greatly tilted upward with respect to the outrigger box 2 when the outrigger beam 3 is extended and jacked up during crane work.

For this reason, the contact portion (reaction force receiving portion) between them becomes a line contact, and excessive stress is generated there.

In order to improve this, the gap c may be made small, but both the outrigger box 2 and the outrigger beam 3 are assembled by welding the plate materials, and since the welding amount is large and welding distortion is likely to occur, the whole of them is There is a limit to how small the gap can be.

Therefore, the present invention provides an outrigger device capable of reducing the stress by allowing the reaction force receiving portions of the outrigger box and the outrigger beam to be in surface contact with each other in an extended state while keeping a sufficient gap. Is.

[0012]

According to a first aspect of the present invention, an outrigger box is telescopically extended in a state in which a vertical gap is formed between the outrigger beams.
A first reaction force receiving portion which is inserted in a retractable manner and contacts the upper surface of the outrigger beam to receive a ground reaction force when the outrigger beam is extended, and a base more than the first reaction force receiving portion at the tip side of the outrigger box. A second reaction force receiving portion that contacts the lower surface of the outrigger beam and receives a ground reaction force at a position on the end side, and (i) the lower surface of the first reaction force receiving portion is lower than the lower surface of the top plate of the outrigger box. (Ii) the upper surface of the second reaction force receiving portion is flush with the upper surface of the bottom plate of the outrigger box, and (iii) the distance between the lower surface of the first reaction force receiving portion and the upper surface of the second reaction force receiving portion is the outrigger. provided in a state where the approximately the same as the height of the beam, and the second reaction in the outrigger box
The second reaction force is received on the tip of the bottom plate upper surface on the tip side of the force receiving section.
It is formed to be lower than the upper surface of the scale .

According to a second aspect of the present invention, in the structure of the first aspect , the beam is lowered in the process of projecting the outrigger beam.
Tip side that passes below the first reaction force receiving portion before inclining to
The beam height dimension of the part is the beam of the base end side part than this
The tip side and the base end should be smaller than the height.
A step is provided between the tops of the side plates .

According to a third aspect of the present invention, in the configuration of the first or second aspect, the outrigger box is provided with an out
In the section where the Riga beam slides in a downward slope
Touch the top surface of the outrigger beam top plate and
A beam guide portion for reducing the inclination is provided.

According to a fourth aspect of the present invention, in the configuration of the third aspect, the outrigger box is provided on the lower surface of the top plate of the outrigger box.
The guide is formed by fixing a member different from the box .

According to a fifth aspect of the present invention, in the structure of the third aspect, the top plate of the outrigger box is bent downward to form the guide portion.

According to the above structure, in a state in which the outrigger beam is extended and jacked up, the top plate upper surface of the outrigger beam is in surface contact with the first reaction force receiving portion, and the bottom plate lower surface is in contact with the second reaction force receiving portion. The beam is horizontal. Therefore, the stress acting on the contact portion between the two can be reduced.

Further, since the stress acting on the reaction force receiving portion can be reduced, the overlapping size of the outrigger box and the outrigger beam can be further reduced, so that the outrigger extension width can be increased.

Here, it is difficult in terms of dimensional control to make the distance between the two reaction force receiving portions the same as the height dimension of the outrigger beam, and a difference actually occurs.

Further, in order to smoothly slide the outrigger beam in the assembling, it is necessary to secure a certain gap between the both reaction force receiving portions and the outrigger beam.

Therefore, strictly speaking, the two reaction force receiving portions and the outrigger beam are not brought into a perfect surface contact state.

However, according to the present invention, it is only necessary to provide high precision in a part of the dimension of the reaction force receiving portion, not in the gap between the outrigger box and the outrigger beam, and this is easy. Therefore, the distance between the two reaction force receiving portions can be made substantially the same as the height dimension of the outrigger beam.

Therefore, since the gap between the two reaction force receiving portions and the outrigger beam can be made as small as possible, the contact portion between the both reaction force receiving portions and the outrigger beam is actually surface-contacted in the jack-up state. The outrigger beam can be substantially horizontal.

In this case, the tip of the bottom plate of the outrigger box is set lower than the upper surface of the second reaction force receiving portion .
Because, outrigger beam is allowed to tilt above downward. Therefore , even if the difference between the distance between the reaction force receiving portions and the height dimension of the outrigger beam is extremely small, the beam can be smoothly overhanged and stored with a small frictional resistance.

On the other hand, according to the second aspect of the invention, since the step is provided on the top surface of the top side of the tip side of the outrigger beam, the beam is offset by the above step in the first period of extension until the beam tilts downward. A sufficient gap can be secured between the top surface of the top plate and the first reaction force receiving portion, and the outrigger beam can be smoothly projected.

Moreover, the above-mentioned gap is minimized in the extended state, and the surface contact action in the jack-up state can be secured.

By the way, according to the above-mentioned structure, the outrigger beam inclines downward in the process of extension.

In this case, if the inclination of the leading edge is large, (a) the abrasion of the lower tip of the outrigger box and the sliding contact portion of the outrigger beam becomes severe, and (b) the grounding plate and the ground are extended with the outrigger extended. Since the distance between the two is small, there arises a problem that the thickness of the plank to be inserted between the ground plate and the ground when jacking up on an uneven ground is limited.

In this respect, according to the third to fifth aspects, since the beam guide portion can suppress the inclination of the downfall of the outrigger beam to a small extent, contact between the lower end of the outrigger box and the outrigger beam at the time of overhanging. It is possible to reduce the wear of the part and to put a board having a sufficient thickness on uneven terrain.

In this case, according to the structure of claim 4 in which another member is fixed to the outrigger box to form the beam guide portion, the processing for forming the guide portion is simple.

[0031]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIGS.

First Embodiment (see FIGS. 1 to 3) Only one of the left and right outrigger devices will be illustrated and described in accordance with the conventional description.

Reference numeral 11 is a carrier frame, 12 is an outrigger box, 13 is an outrigger beam, 14 is a jack cylinder, and 15 is a grounding body.

The outrigger box 12 has a top plate 12a.
The first reaction force receiving portion 16 is provided at the tip of the first reaction force receiving portion 16, and the second reaction force receiving portion 17 is provided at a position away from the first reaction force receiving portion 16 on the bottom plate 12b toward the base end by a distance L, as shown in FIG. As shown in FIG. 2, the base end side of the outrigger beam 13 is supported by the both reaction force receiving portions 16 and 17 in a state where the outrigger beam 13 is projected and jacked up.

Here, the height dimension Ha of the outrigger beam 13 is sufficiently smaller than the inner height dimension Hb of the outrigger box 12, and a sliding gap c is formed between them due to this dimension difference.

The second reaction force receiving portion 17 is provided such that its upper surface is flush with the upper surface of the bottom plate of the outrigger box 12.

On the other hand, the first reaction force receiving portion 16 is provided so as to project downward from the lower surface of the top plate of the outrigger box 12, and the lower surface of the first reaction force receiving portion 16 and the second reaction force receiving portion 17 are provided. The distance d from the upper surface is set to be substantially the same as the height dimension Ha of the outrigger beam 13 (a slightly smaller value).

As described above, by setting Ha <Hb and d≈Ha, the outrigger beam 1 is set as shown in FIG.
In the state where 3 is overhanging and jacked up, the top plate upper surface of the outrigger beam 13 is in surface contact with the first reaction force receiving portion 16 and the bottom plate lower surface is in contact with the second reaction force receiving portion 17, respectively, so that the outrigger beam 13 is substantially horizontal. Become. Therefore, the stress acting on the contact portion between the two can be reduced.

Further, since the outrigger beam 13 can be made substantially horizontal, the overlapping dimension M of the outrigger box 12 and the outrigger beam 13 can be reduced, so that the outrigger overhanging width can be increased.

Since the distance d between the reaction force receiving portions 16 and 17 is slightly smaller than the height dimension Ha of the outrigger beam 13, strictly speaking, the reaction force receiving portions 16 and 17 and the outrigger beam 13 are strictly. And are not in full surface contact.

However, unlike the case of the entire clearance between the tubular bodies of the outrigger box 12 and the outrigger beam 13, only a part of the dimension of the reaction force receiving portions 16 and 17 needs to be highly accurate. The dimensional accuracy can be made high, and the gap between the two reaction force receiving portions 16 and 17 and the outrigger beam 13 can be easily set to the minimum dimension that does not hinder the sliding of the outrigger beam 13.

Therefore, in the jack-up state of FIG. 3, the contact portions between the two reaction force receiving portions 16 and 17 and the outrigger beam 13 can actually be in surface contact, and the outrigger beam 13 can be made substantially horizontal.

On the other hand, the bottom plate 12 of the outrigger box 12
a portion 12b on the front end side of the second reaction force receiving portion 17 in FIG.
1 is provided at a position lower than the upper surface of the second reaction force receiving portion 17.

In this way, the outrigger beam 13 is allowed to incline downward as shown in FIG. 2 during the overhanging / storing process, so that the distance d between the two reaction force receiving portions 16 and 17 and the outrigger beam height are increased. Even if the difference in the dimension Ha is made extremely small, the beam 13 can be smoothly extended and stored with a small frictional resistance.

Second embodiment (see FIGS. 4 to 8) Only differences from the first embodiment will be described.

FIG. 4 shows a state in which the outrigger beam 13 is stored. In this state, the center of gravity O of the outrigger beam 13 is located in the outrigger box 12 closer to the base end side than the second reaction force receiving portion 17. .

The process of projecting the outrigger beam 13 from this state is shown in FIG. 5 and below.
6 inclines downward from the time when the center of gravity O reaches the tip of the second reaction force receiving portion 17, as shown in FIG.
When the center of gravity O reaches the tip of the outrigger box 12 as shown in FIG. 5, the inclination degree of the downward slope becomes the maximum, and thereafter, it is extended to the final extension position shown in FIG.

In the second embodiment, a beam which comes into contact with the upper surface of the base end portion of the outrigger box 12 on the bottom surface of the top plate of the outrigger box 12 in a section where the outrigger beam 13 slides to the final overhang position in the maximum tilted state. A guide portion 18 is provided.

The beam guide portion 18 is formed by fixing another member, whose front half on the lower surface is horizontal and whose half on the proximal end is inclined downward, to the lower surface of the top plate by welding or the like.

The beam guide portion 18 makes it possible to reduce the degree of inclination of the leading edge when the outrigger beam is extended.

As a result, it is possible to reduce the wear of the contact portion between the lower portion of the tip of the outrigger box 12 and the outrigger beam 13 at the time of overhang.

In addition, it is possible to insert a board 19 having a sufficient thickness on uneven terrain as shown in FIG.

By the way, in the second embodiment, the tip end side portion of the outrigger beam 13, that is, the beam 13 passes below the first reaction force receiving portion 16 before the beam 13 inclines downward in the process of projecting the outrigger beam. In part,
By making the top plate thickness of the beam 13 smaller than other portions, the beam height dimension Ha ′ of the tip side portion is made smaller than the beam height dimension Ha of the main body portion. X in FIG. 4 indicates this dimensional difference (step).

In this way, the outrigger beam 13 has a sufficient gap between the upper surface of the beam top plate and the first reaction force receiving portion 16 for the step difference in the first period of extension until the outrigger beam 13 is inclined downward. The beam 13 can be smoothly projected.

Moreover, since d≈Ha, both reaction force receiving portions 16 and 17 and the outrigger beam 13 are in the extended state.
The gap between and can be minimized, and the surface contact action in the jack-up state shown in FIG. 8 can be secured.

Third Embodiment (See FIG. 9) In the second embodiment, the top plate 12a of the outrigger box 12 is used.
The beam guide portion 1 is formed by fixing another member to the lower surface.
8 is formed, the beam guide portion 20 is formed by partially bending the top plate 12a of the outrigger box 12 downward in the third embodiment.

With this configuration, basically, the same effect as that of the second embodiment can be obtained.

In both the second and third embodiments, the beam guide portions 18 and 20 may be provided only at one location such as the central portion in the front-rear width direction of the outrigger box 12, or at a plurality of locations including the central portion. It may be provided.

Further, the bottom plate 12 of the outrigger box 12
a portion 12b on the front end side of the second reaction force receiving portion 17 in FIG.
1 may be provided at a position lower than the upper surface of the second reaction force receiving portion 17 with the whole being horizontal as illustrated in both the first and second embodiments, or as shown in FIG. 2 The reaction may be inclined downward so that it is lower than the upper surface of the reaction force receiving portion.

On the other hand, the present invention is not limited to wheel cranes, but can be widely applied to work machines equipped with outrigger devices including crawler cranes and aerial work vehicles.

[0061]

As described above, according to the present invention, the height dimension Ha of the outrigger beam and the outrigger box 12 are set.
Since the relationship between the inner height dimension Hb and the distance d between the first and second reaction force receiving portions is set to Ha <Hb, d≈Ha, the outrigger beam is overhanged and jacked up. The top plate upper surface contacts the first reaction force receiving portion and the bottom plate lower surface contacts the second reaction force receiving portion, so that the outrigger beam becomes substantially horizontal. Therefore, the stress acting on the contact portion between the two can be reduced.

Further, since the stress acting on the reaction force receiving portion can be reduced, the overlapping size of the outrigger box and the outrigger beam can be further reduced, so that the outrigger extension width can be increased.

In this case, according to the second aspect of the invention, the bottom plate tip portion of the outrigger box is set lower than the upper surface of the second reaction force receiving portion, so that the outrigger beam is allowed to incline downward. Therefore, even if the difference between the distance between the two reaction force receiving portions and the height dimension of the outrigger beam is extremely small, the beam can be smoothly extended and stored with a small frictional resistance.

Further, according to the invention of claim 3, since the step is provided on the top surface of the top plate of the tip side of the outrigger beam, the beam is increased by the above step in the first period of extension until the beam is inclined downward. A sufficient gap can be secured between the top surface of the top plate and the first reaction force receiving portion, and the outrigger beam can be smoothly projected.

Moreover, the above-mentioned gap is minimized in the extended state, and the surface contact action in the jack-up state can be secured.

Further, according to the inventions of claims 4 to 6, since the inclination degree of the outrigger beam falling down can be suppressed by the beam guide portion, the contact portion between the lower end of the outrigger box and the outrigger beam at the time of overhanging. It is possible to reduce the wear of and to put a board having a sufficient thickness on uneven terrain.

In this case, according to the invention of claim 5 in which another member is fixed to the outrigger box to form the beam guide portion, the machining for forming the guide portion is simple.

[Brief description of drawings]

FIG. 1 is a sectional view of an outrigger beam retracted state in an outrigger device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the outrigger beam in the middle of extension.

FIG. 3 is a cross-sectional view of the outrigger beam projecting state.

FIG. 4 is a sectional view of the outrigger beam retracted state in the outrigger device according to the second embodiment of the present invention.

FIG. 5 is a cross-sectional view of the same outrigger beam overhanging period.

FIG. 6 is a sectional view of the same period.

FIG. 7 is a sectional view of the same overhanging state.

FIG. 8 is a cross-sectional view showing a jack-up state after overhanging.

FIG. 9 is a sectional view of an outrigger device according to a third embodiment of the present invention in a state in which an outrigger beam is extended and jacked up.

FIG. 10 is a sectional view of an outrigger beam retracted state in a conventional outrigger device.

FIG. 11 is a cross-sectional view of a state in which the outrigger beam is extended and jacked up.

[Explanation of symbols]

12 Outrigger box 13 Outrigger beam 16 First reaction force receiving portion 17 Second reaction force receiving portion d Distance between both reaction force receiving portions Ha Height dimension of outrigger beam Hb Inner height dimension of outrigger box 12b1 Second outrigger box bottom plate A portion 18 closer to the tip than the reaction force receiving portion 18 A beam guide portion formed by fixing another member to the lower surface of the top plate 20 A beam guide portion formed by bending the top plate downward

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Claims (5)

(57) [Claims] 1. An outrigger beam is telescopically extended and retractably inserted into the outrigger box in such a manner that a vertical gap is formed between the outrigger box and the outrigger box. A first reaction force receiving portion that comes into contact with the upper surface of the outrigger beam and receives the ground reaction force, and a first reaction force receiving portion that comes into contact with the lower surface of the outrigger beam and receives the ground reaction force at a position closer to the base end side than the first reaction force receiving portion. (I) the lower surface of the first reaction force receiving portion is located below the lower surface of the top plate of the outrigger box, and (ii) the upper surface of the second reaction force receiving portion is outboard of the outrigger box. bottom plate upper surface and flush with, provided in (iii) state of the lower surface and the spacing of the upper surface of the second reaction force receiving portion of the first reaction force receiving section is substantially the same as the height of the outrigger beams and the outrigger box Definitive second reaction
The second reaction force is received on the tip of the bottom plate upper surface on the tip side of the force receiving section.
An outrigger device characterized in that it is formed lower than the upper surface of the scale part. 2. The outrigger device according to claim 1, wherein the outrigger beam is lowered in the process of projecting.
Tip side that passes below the first reaction force receiving portion before inclining to
The beam height dimension of the part is the beam of the base end side part than this
The tip side and the base end should be smaller than the height.
An outrigger device characterized in that a step is provided between the upper surfaces of the side plates . 3. The outrigger device according to claim 1 or 2, wherein an outrigger is provided on a lower surface of a top plate of the outrigger box.
In the section where the gab Beam slides in a downward slope,
Touch the top surface of the U-trigger beam and tilt it downward
An outrigger device having a beam guide portion for reducing the inclination . 4. A outrigger apparatus of claim 3 Symbol mounting, the top plate lower surface of the outrigger box, outrigger box
An outrigger device characterized in that a guide part is formed by fixing a member different from the box. 5. The outrigger device according to claim 3 , wherein the top plate of the outrigger box is bent downward to form a guide portion.