JP2002332199A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the stability of a vehicle. SOLUTION: The vehicle for high lift work 1 comprises jacks 7 mounted on both left and right sides of a vehicle body 3 to support the vehicle body 3, and a counterweight 11 mounted on a revolving base 9 and disposed on a revolving base rear portion opposite to a derricking region of a boom 13. Each jack 7, when retracted, positions an outer end of a grounding plate 8 inside the side 3a of the vehicle body 3, and when deployed or extended slantingly outward and downward from the vehicle body 3 until the grounding plate 8 is grounded, positions the outer end outside the side 3a of the vehicle body 3 to support the vehicle body 3. When the revolving base 9 is revolved as the jacks 7 support the vehicle body 3, a rear end of the counterweight 11 is moved inside the outer end of the grounded grounding plate 8 of the jack 7 and outside the side 3a of the vehicle body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working vehicle, and more particularly, to a turntable which is mounted on a vehicle body and is capable of turning, and a base which is pivotally connected to the turntable to move up and down. A work vehicle having a boom configured to be capable of.

[0002]

2. Description of the Related Art An aerial work vehicle includes a swivel table slidably mounted on a vehicle body, a boom mounted slidably on the swivel table, and a work table mounted at a tip of the boom. Some are configured as:

[0003] In this aerial work vehicle, a boom is operated to move a work table to a desired height position, and an operator on the work table performs work at a height. Here, when the workbench is moved to a higher place, the moment in the overturning direction acting on the vehicle body side (hereinafter, referred to as “overturning moment”) increases, and the vehicle body support tends to become unstable. In view of this, some conventional aerial work vehicles have stabilizing weights attached to both sides of the lower part of the vehicle body to lower the center of gravity of the vehicle and increase vehicle stability.

In this aerial work platform, when the turntable and the boom are operated to change the position of the worktable, a moment in a direction in which the vehicle body is not overturned by the stabilizing weight according to the position of the worktable (hereinafter referred to as a "safety moment"). ) Is generated, and the safe moment acts to offset the overturning moment.

[0005]

However, since the stabilizing weight is fixed to the vehicle body and does not act in relation to the turning of the boom, the boom is swiveled to a position extending in the width direction of the vehicle and the workbench is rotated. If the body moves outside the stabilizing weight in plan view, the stabilizing weight located on the opposite side to the extension side of the boom and attached to the lower part of the body acts as a safe moment, while on the same side as the boom undulation side The stabilizing weight located at the bottom of the vehicle does not effectively act as a safe moment. For this reason, depending on the turning position of the boom, it may not be possible to use all of the stabilizing weights as the safe moment.

[0006] The stabilizing weight, which cannot be used as the safe moment, only increases the weight of the vehicle, causing a problem that the running performance and fuel efficiency of the vehicle are reduced and the vehicle price is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the entire stabilizing weight acts as a safe moment irrespective of the turning position of the boom to improve the stability of the vehicle. Without lowering performance or fuel economy.
It is an object of the present invention to provide a work vehicle with a low vehicle price.

[0008]

In order to solve the above-mentioned problems, a working vehicle according to the present invention is provided with a turntable mounted on a vehicle body and capable of turning, and a base end pivotally connected to the turntable. And a boom configured to be able to move up and down. On the left and right sides of the vehicle body, the outer end of the lower end is located inside the side of the vehicle body when retracted, and extends outward diagonally downward from the vehicle body when extended, the lower end touches down, and the outer end of the lower end is A jack that supports the vehicle body and is located outside the side is attached. When the revolving base swings while the vehicle body is supported by the jack, the rear end of the revolving base body portion of the revolving base is located inside the outer end of the lower end of the grounded jack and outside the side of the vehicle body. Moving.

According to the work vehicle of the above construction, when the swivel base swings while the vehicle body is supported by the jack, the rear end of the swivel base body of the swivel base is moved from the outer end of the lower end of the jack to the ground. Also move inside and outside of the side of the vehicle body.

Here, since the rear end of the swivel base body moves inside the outer end of the lower end of the grounded jack and outside the side of the vehicle body, the center of gravity of the swivel base is located. Can be located on the rear side of the swivel.
For this reason, compared to the conventional method in which a part of the stabilizing weight did not effectively act as a safe moment for preventing the vehicle from tipping over depending on the turning position of the turntable, The weight can always act as a safe moment, and as a result, the stability of the vehicle can be improved. In addition, even if the swivel base is swung, the rear end of the swivel base body does not protrude beyond the outer end of the lower end of the grounded jack. By performing the work, it is possible to ensure the safety of the worker.

In the present specification, the swivel base body means a swivel base that does not include these parts when parts such as a cover and a guide are attached to the swivel base. As a result, the rear end of the swivel base body is in contact with the ground while the parts are protruding outside the outer end of the lower end of the grounded jack while the vehicle body is supported by the jack and the swivel is swiveling. If the jack is configured to move inside the outer end of the lower end of the jack and to the outside of the side of the vehicle body, it is understood that the turntable having the components is within the technical scope of the present invention.

In the work vehicle having the above structure, a counterweight is attached to a rear portion of the turntable opposite to the up-and-down side of the boom, and when the turntable pivots while the vehicle body is supported by the jack, the counterweight is rotated. The rear end of the jack may move inside the outer end of the lower end of the grounded jack and outside the side of the vehicle body.

According to the working vehicle having the above structure, when the swivel base swings while the vehicle body is supported by the jack, the rear end of the counterweight is inside the outer end of the lower end of the grounded jack and the vehicle body. Move outside of the side of.

Here, since the counterweight is disposed at the rear of the turntable on the side opposite to the up and down side of the boom, all of the counterweight can act as a safe moment regardless of the turning position of the turntable. it can. Therefore, the stability of the vehicle can be further improved, and
Reduce the weight of the vehicle because there is no counterweight that does not act as a safe moment compared to the conventional model where a part of the safety weight did not act effectively as a safe moment depending on the turning position of the turntable. As a result, fuel economy can be improved without lowering the vehicle running performance. Further, since the counter weight is provided at the rear of the swivel, if the magnitude of the necessary safe moment generated by the counter weight is set, the counter weight required to obtain the set safe moment is set. Weight can be reduced.
In addition, since the rear end of the boom main body does not exceed the outer end of the lower end of the grounded jack regardless of the turning position of the swivel table, the possibility that the boom collides with an obstacle or the like outside the outer end of the lower end of the jack is prevented. can do.

In this specification, the boom main body means a boom excluding these components when a component such as a cover or a guide is attached to a base or the like of the boom. As a result, when the turntable pivots while the jack supports the vehicle body and the rear end of the boom main body protrudes outward from the side of the vehicle body, the parts move outward from the outer end of the lower end of the jack where the ground contacts. If the rear end of the boom main body portion is inside the outer end of the lower end of the jack even when it protrudes, it is understood that the boom having the component is within the technical scope of the present invention.

Further, when the swivel base swings in a state where the vehicle body is supported by the jack and the boom is rising, the rear end of the boom main body portion is connected to the outer end of the lower end of the jack in contact with the ground. You may comprise so that it may not move over.

According to the working vehicle having the above structure, the rear end of the boom main body is configured not to exceed the outer end of the lower end of the grounded jack regardless of the turning position of the swivel. The possibility of colliding with an obstacle or the like outside the outer end of the lower end can be prevented beforehand.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. This embodiment shows an aspect of an aerial work vehicle provided with a boom which is attached to a vehicle body so as to be able to move up and down, extend and retract, and pivot.

FIG. 1 is a rear side view of the aerial work vehicle viewed from the rear side, and FIG. 2 is a front view of the aerial work vehicle. As shown in FIGS. Has a driving cabin 5 at the front of the vehicle body 3.
On the left and right sides of the front and rear of the vehicle body behind the driving cabin 5, jacks 7 projecting obliquely outward and supporting the vehicle body 3 are disposed. The jack 7 is attached to the vehicle body 3 so as to extend obliquely downward in the vehicle body width direction, and at the lower end of the jack 7 is attached a plate-like grounding plate 8 that contacts the ground J so as to be vertically swingable. The jack 7 is arranged such that the outer end of the ground plate 8 is located near the inside of the side portion 3a of the vehicle body 3 when retracted, and the outer end of the ground plate 8 is located outside the side portion 3a of the vehicle body 3 when extended. It is configured.
At the rear of the vehicle body, there is provided a swivel table 9 which is driven by a swing motor (not shown) built in the vehicle body 3 so as to be able to turn horizontally.

A counter weight 11 projecting in the horizontal direction is attached to the lower rear portion of the swivel 9. When the turntable 9 turns while the jack 7 supports the vehicle body 3, the counterweight 11 has a rear end of the counterweight 11 inside the outer end of the grounding plate 8 of the jack 7 and the body 3. Is attached to the swivel 9 so as to move outside the side 3a. That is, the rear end of the counterweight 11 moves inside the vertical axis A1 passing through the outer end of the grounding plate 8 and outside the vertical axis A2 passing through the side 3a of the vehicle body 3 so as to move within the range. Attached to.

A boom 13 whose base end is pivotally mounted is attached to the upper portion of the swivel 9, and the boom 13 is configured to be able to move up and down by an up-and-down cylinder 15. The boom 13 is configured to be telescopically moved by a built-in telescopic cylinder 14 in which a base boom 13a, an intermediate boom 13b, and a distal boom 13c are nested. The pivot position P of the base boom 13a to the swivel 9 is a predetermined distance L3 from the rear end of the base boom 13a toward the boom tip.
In the position with. That is, when the boom 13 is in the horizontal state, the base end of the base boom 13a is turned so that the rear end of the base boom 13a is located at a position having a predetermined distance L3 to the left of the pivot position P. 9 In the fully retracted state, the boom 13 is configured such that the rear end of the intermediate boom 13b moves to a position near the rear end of the base boom 13a and is housed, and the rear end of the front boom 13c is the rear end of the intermediate boom 13b. It is configured to be moved to and housed at a position having a predetermined distance from the boom tip side.
The upper surface of the base end of the boom 13 is formed with an inclined surface 13d that is inclined toward the base end.

The vehicle body 3 is supported by the jack 7 and the boom 13 is raised and raised.
When the turntable 9 turns while the inclined surface 13d formed at the rear end moves outward from the side portion 3a of the vehicle body 3,
The inclined surface 13d of the boom 13 is configured to move so as not to exceed the vertical axis A1 passing through the outer end of the grounding plate 8 that is grounded. Boom 13 is provided at the tip of tip boom 13c.
The work table 17 is always mounted in a horizontal state irrespective of the undulating angle.

Next, the operation of the aerial work vehicle 1 will be described. The aerial work vehicle 1 moves to the work site, and the jack 7
Is overhanging and supports the vehicle, and
It is assumed that the swiveling base 9 is swiveling and the boom 13 is in a state of extending horizontally in the vehicle width direction. When the jack 7 is extended, the jack 7 extends obliquely downward, and the ground plate 8 contacts the ground J to support the vehicle body 3.

When the boom 13 is in a horizontal state, the moment acting on the vehicle body 3 around the turning center O of the turning table 9 is
The overturning moment M1 acting in the direction of overturning the vehicle by the load W1 applied to the tip of the boom 13, the safety side moment M2 preventing the vehicle from overturning by the load W2 of the counterweight 11, and the jack 7 on the right side of the vehicle This is a safe moment Mr that prevents the vehicle from falling over due to the ground reaction force R received from the ground J. The overturning direction moment M1 is represented by W1 × L1, the safe moment M2 is represented by W2 × L2, and the safe moment Mr is represented by Wr × Lr. Here, L1 represents the horizontal distance from the turning center O to the position where the load W1 acts, and L2 represents the horizontal distance from the turning center O to the position where the load W2 acts (the center of gravity G of the counterweight 11). Lr indicates the horizontal distance from the turning center O to the position where the load Wr acts.

Since the aerial work vehicle 1 is in a state where it does not fall, the condition of M2 + Mr> M1 is satisfied.
Here, since the counterweight 11 is disposed on the turntable 9 on the side opposite to the up-and-down side of the boom 13 with the center of the turn center O as the center, all of the counterweight 11 is independent of the turn position of the turntable 9. Can always act as the safe side moment M2. As a result, the weight of the turntable 9 is always kept irrespective of the turning position of the turntable 9 as compared with the related art in which a part of the stabilizing weight did not effectively act as a safe moment for preventing the vehicle from tipping over. It can act as a safe moment, and as a result, the stability of the vehicle can be improved.

Further, since there is no counterweight 11 which does not act as the safe moment M2, the weight of the vehicle can be reduced as compared with the conventional art in which a part of the stabilizing weight does not act as the safe moment. it can. Further, the load W2 constituting the safe side moment M2 is the weight of the counterweight 11, and the counterweight 11 extends from the rear of the swivel 9 to the side opposite to the undulating side of the boom 13 from the outside of the side portion 3a of the vehicle body 3. Since it is provided so as to extend, the position G of the center of gravity of the counterweight 11 is at a position having a distance L2 far from the position of the turning center O of the turning table 9. For this reason, the weight of the counterweight 11 for obtaining a moment having the same magnitude as the safe side moment M2 depends on the position G of the center of gravity of the counterweight 11 as the turning center O.
Can be made lighter than in the case where it is close to the position. As a result, the vehicle weight of the aerial work vehicle 1 can be further reduced, and the fuel efficiency can be improved without lowering the vehicle running performance.

Further, even if the swivel table 9 is swung, the rear end of the counterweight 11 does not protrude beyond the outer end of the ground plate 8 of the jack 7 which is grounded. By performing the work outside the outside end using the outside end as a guide, the safety of the worker can be ensured.

In the above-described embodiment, the case where the counterweight 11 is moved to the left side of the vehicle has been described.
When the counterweight 11 is moved to the right side of the vehicle, the same operation and effect as in the case where the counterweight 11 is on the left side of the vehicle are provided, and the description thereof is omitted.

Next, a description will be given of a case where the turntable 9 is turned while the boom 13 in the horizontal state is raised. When the up-and-down cylinder 15 is extended, the boom 13 moves up and down to a slightly erected state. At the same time, the base end of the boom 13 moves outside the side 3a of the vehicle. Here, the boom 13 is moved by the jack 7 to the vehicle body 3.
Is supported and the base end of the boom 13 projects outside the side of the vehicle body, the inclined surface 13d of the base end of the boom is configured not to extend beyond the outside end of the grounding plate 8 of the jack 7. Therefore, the risk that the base end of the boom 13 collides with an obstacle or the like located on the left side of the outer end of the ground plate 8 can be prevented. In addition, even when the swivel base 9 is rotated by 180 degrees from the state shown in FIG. 1 to move the base end of the boom 13 to the right side of the vehicle, the inclined surface 1 of the base end of the boom can be used.
3d is configured so as not to protrude to the right of the tip of the ground plate 8 of the jack 7, so that the base end of the boom 13 may collide with an obstacle or the like located to the right of the outer end of the ground plate 8. Can be prevented beforehand.

Since the rear end of the boom 13 is disposed at a position having a predetermined distance L3 from the pivot position P to the swivel table 9, the rear end of the boom 13 is located near the pivot position P. The extension length of the proximal boom 13a according to the present invention can be made longer than that of a positioned boom (not shown). Therefore, the intermediate boom 13 accommodated in the base end boom 13a
The extension length of the boom 13 and the extension length of the tip boom 13c accommodated in the intermediate boom 13b can be increased. As a result, the boom length in the entire extension of the boom 13 can be increased.

[0031]

As described above, according to the working vehicle of the present invention, the jacks attached to the left and right sides of the vehicle body have their lower ends located inside the side parts of the vehicle body during storage. When the jack is retracted, when the jack is retracted, the lower end of the jack is extended when the jack is retracted by extending diagonally downward from the vehicle body, making the lower end touch down, and the outer end of the lower end is positioned outside the side of the vehicle body to support the vehicle body. Since the jack does not protrude to the outside of the side of the vehicle body, the worker can work safely while the jack is stored. In addition, when the jack is extended, the rear end of the turntable main body is configured to move inside the outer end of the lower end of the grounded jack and outside the side of the vehicle body. Since the position of the center of gravity can be located on the rear side of the turntable, the stability of the vehicle can be improved. In addition, even if the swivel base is swung, the rear end of the swivel base body does not protrude beyond the outer end of the lower end of the grounded jack. Performing the work in this manner is advantageous in ensuring worker safety.

[Brief description of the drawings]

FIG. 1 is a rear side view of an aerial work vehicle according to an embodiment of the present invention.

FIG. 2 is a front view of the aerial work vehicle in one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 aerial work vehicle (working vehicle) 3 body 3a side part 7 jack 8 ground plate (lower end) 9 swivel base 11 counter weight (slew base main body) 13 boom 13a base end boom (boom main body)

Claims (3)

[Claims] 1. A work vehicle comprising: a turntable attached to a vehicle body and configured to be rotatable; and a boom that is pivotally connected to a base end thereof and configured to be able to move up and down. Attached to the left and right sides of the vehicle body, the outer end of the lower end is located inside the side part of the vehicle body when retracted, and extends downward diagonally outward from the vehicle body when extended, and the lower end is grounded and the lower end is An outer end of the turntable is located outside the side portion of the vehicle body and has a jack that supports the vehicle body. A work vehicle, wherein a rear end of the revolving base main body is configured to move inside an outer end of a lower end of the jack that is in contact with the ground and to move outside a side portion of the vehicle body. 2. A counterweight attached to a rear portion of the swivel table on a side opposite to an up-and-down side of the boom, wherein when the swivel table swings while the jack supports the vehicle body, 2. The work vehicle according to claim 1, wherein a rear end of the counterweight is configured to move inside an outer end of a lower end of the jack that is in contact with the ground and to move outside a side portion of the vehicle body. . 3. The boom, wherein the rear end of the boom body portion of the boom is in contact with the ground when the swivel table swings while the body is supported by the jack and the boom is rising. 3. The work vehicle according to claim 1, wherein the work vehicle is configured to move so as not to exceed an outer end of a lower end of the jack.