JP2021004013A - Outrigger device and service vehicle - Google Patents

Abstract

To provide an outrigger device which enables improvement of stability performance.SOLUTION: An outrigger device 1 includes: an outrigger jack 20 having a jack cylinder 21 disposed along a vertical direction; a float 40; and a connection part 30 which connects the outrigger jack 20 with the float 40. A first rotation axis A1 which is a rotation axis of the float 40 relative to the outrigger jack 20 and along an anteroposterior direction is disposed at the outer side of a center axis O of the jack cylinder 20 when viewed in a vehicle width direction. A fulcrum of overturning of the service vehicle moves to the outer side in the vehicle width direction by a distance of the first rotation axis A1 being arranged at the outer side in the vehicle width direction. The structure increases a stability moment of the service vehicle and achieves improvement of stability performance.SELECTED DRAWING: Figure 4

Description

The present invention relates to outrigger devices and work vehicles. More specifically, the present invention relates to an outrigger device and a work vehicle including the outrigger device.

An outrigger device is provided on a work vehicle such as a mobile crane or an aerial work platform in order to ensure stability against a fall (for example, Patent Document 1). The outrigger device usually has an overhang mechanism that projects the outrigger jack in the vehicle width direction. If the outrigger jack is extended in the vehicle width direction, the stability moment can be increased and the stability performance of the work vehicle can be improved.

JP-A-2017-1861

However, the overhang width of the outrigger jack is limited depending on the surrounding conditions of the work vehicle. In some cases, it may be necessary to jack up the outrigger jack while keeping it within the width of the vehicle. In such a case, the stability performance of the work vehicle deteriorates.

In view of the above circumstances, an object of the present invention is to provide an outrigger device capable of improving stability performance and a work vehicle provided with the outrigger device.

The outrigger device of the first invention is an outrigger device provided on a work vehicle, and includes an outrigger jack having a jack cylinder arranged along the vertical direction of the work vehicle, a float that touches the ground when jacking up, and the outrigger jack. The float is provided with a connecting portion for connecting the float and the float, and the first rotating shaft of the float with respect to the outrigger jack, which is along the front-rear direction of the work vehicle, is larger than the central axis of the jack cylinder. It is characterized in that it is arranged on the outside in the vehicle width direction.
In the first invention, the outrigger device of the second invention is capable of rotating the upper member provided on the outrigger jack, the lower member provided on the float, and the upper member and the lower member. The first connecting shaft is provided along the front-rear direction of the work vehicle, and is arranged outside the central axis of the jack cylinder in the vehicle width direction. It is characterized by being.
The outrigger device of the third invention is characterized in that, in the second invention, the connecting portion includes a rotation limiting portion that limits the rotation of the lower member with respect to the upper member around the first connecting axis within a predetermined angle range. And.
In the second invention, the out-trigger device of the fourth invention has the first connecting shaft fixed to one of the upper member and the lower member and inserted into a bearing hole formed in the other, and the first connecting shaft is formed. The shaft has a cuneus portion that narrows upward, the bearing hole has an insertion portion into which the wedge portion fits, and a gap is provided in the vertical direction between the wedge portion and the insertion portion. It is characterized by being bearing.
In any one of the second to fourth inventions, the outrigger device of the fifth invention includes a second connecting shaft that rotatably connects the outrigger jack and the upper member, and the second connecting shaft. Is characterized in that it is arranged along the vehicle width direction.
In the first invention, the out-trigger device of the sixth invention includes an upper ring provided on the out-trigger jack and a lower ring provided on the float and passing through a hole of the upper ring. One of the upper ring and the lower ring is a vertical surface along the front-rear direction of the work vehicle, and is arranged along the vertical surface arranged outside the central axis of the jack cylinder in the vehicle width direction. The other of the upper ring and the lower ring is characterized in that it is arranged along a vertical plane along the vehicle width direction.
The outrigger device of the seventh invention is the outrigger device according to any one of the first to sixth inventions, wherein the outrigger jack has a square tubular outer cylinder connected to one of a cylinder tube and a rod of the jack cylinder, the cylinder tube and the said. It is characterized by including a square tubular inner cylinder connected to the other side of the rod and inserted into the outer cylinder.
In the seventh invention, the outrigger device of the eighth invention has the inner cylinder inserted through the opening at the lower end of the outer cylinder, and when the jack cylinder is contracted, the connecting portion is housed inside the outer cylinder. , The float closes the opening.
In the eighth aspect of the invention, the outrigger device of the ninth invention includes a guide for making the float horizontal by contacting the outer cylinder when the connecting portion is inserted into the outer cylinder. It is characterized by that.
In any one of the first to sixth aspects of the tenth invention, the out-trigger jack is attached to one of an outer shell connected to a rod of the jack cylinder, a cylinder tube of the jack cylinder, and the outer shell. It is characterized by comprising a fixed slider and a rail fixed and fitted to the other of the cylinder tube and the outer shell to guide the slider in the vertical direction.
The work vehicle of the eleventh invention is characterized by including any outrigger device according to any one of the first to tenth inventions.

According to the first invention, since the first rotation shaft of the float is arranged outside the central axis of the jack cylinder in the vehicle width direction, the overturning fulcrum of the work vehicle moves outward in the vehicle width direction by that amount. As a result, the stability moment of the work vehicle is increased, and the stability performance can be improved.
According to the second invention, by arranging the first connecting shaft connecting the upper member and the lower member outside the central axis of the jack cylinder in the vehicle width direction, the first rotating shaft of the float is located outside in the vehicle width direction. Can be placed.
According to the third invention, since the inclination of the float can be suppressed in the process of extending the outrigger jack, the float does not stick when it comes into contact with the ground.
According to the fourth invention, since the float can be kept horizontal in the process of extending the outrigger jack, the float does not stick when it comes into contact with the ground.
According to the fifth invention, since the float can be tilted in all directions by the first and second rotation axes, the float can be tilted according to the ground.
According to the sixth invention, by arranging the upper ring or the lower ring outside the central axis of the jack cylinder in the vehicle width direction, the first rotation axis of the float can be arranged outside in the vehicle width direction.
According to the seventh invention, by inserting the square tubular inner cylinder into the square tubular outer cylinder, the rotation of the rod around the axis with respect to the cylinder tube is restricted. Therefore, it is possible to maintain a state in which the first rotation axis of the float is arranged outside in the vehicle width direction.
According to the eighth invention, since the connecting portion can be accommodated inside the outer cylinder, the connecting portion can be protected from water splashes while the vehicle is running.
According to the ninth invention, when the outrigger jack is contracted, the attitude of the float can be smoothly leveled.
According to the tenth invention, fitting the slider to the rail limits the rotation of the cylinder tube around the axis with respect to the rod. Therefore, it is possible to maintain a state in which the first rotation axis of the float is arranged outside in the vehicle width direction.
According to the eleventh invention, since the tipping fulcrum of the work vehicle moves outward in the vehicle width direction, the stability moment of the work vehicle can be increased and the stability performance can be improved.

It is a side view of the aerial work platform which concerns on 1st Embodiment. It is a front view of the outrigger device which concerns on 1st Embodiment. It is a vertical sectional view of the outrigger device of FIG. It is a perspective view of the connecting part. It is a front view of the connecting part. FIG. 5 is a cross-sectional view taken along the line VI-VI in FIG. FIG. (A) is a vertical cross-sectional view of the connecting portion in a state where the float is tilted. FIG. (B) is a vertical cross-sectional view of the connecting portion in a state where the float is tilted in another direction. FIG. (A) is a vertical cross-sectional view of the outrigger device in the process of contracting the outrigger jack. FIG. (B) is a vertical cross-sectional view of the outrigger device in a state where the outrigger jack is completely contracted. It is a side view of the connection part in the state where the float is grounded in the 2nd Embodiment. It is a side view of the connection part in the state which the float is not grounded in 2nd Embodiment. It is a vertical sectional view of the outrigger apparatus which concerns on 3rd Embodiment. 11 is a cross-sectional view taken along the line XII-XII in FIG. 11 is a cross-sectional view taken along the line XIII-XIII in FIG. It is a front view of the connecting part of the 3rd Embodiment. It is a side view of the connecting part of FIG.

Next, an embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
(Aerial work platform)
The outrigger device according to the first embodiment of the present invention is mounted on a work vehicle. The work vehicle is not particularly limited as long as it requires an outrigger device, and examples thereof include mobile cranes, aerial work platforms, and road-rail vehicles. Examples of mobile cranes include all-terrain cranes, rough terrain cranes, truck cranes, and loaded truck cranes. Hereinafter, the case of an aerial work platform will be described as an example.

In the present specification, as shown in FIG. 1, the x-axis, y-axis, and z-axis are defined with reference to the front-rear, left-right, and up-down of the work vehicle. The x-axis is along the front-rear direction of the work vehicle. The y-axis is along the vehicle width direction (direction perpendicular to the paper surface of FIG. 1) of the work vehicle. The z-axis is along the vertical direction of the work vehicle.

As shown in FIG. 1, the aerial work platform AA has a vehicle body 10. The front portion of the vehicle body 10 is the driver's cab 11, and the rear portion is the loading platform 12. The vehicle body 10 is provided with a drive source, wheels, and the like for traveling the vehicle.

A swivel base 13 is mounted on the loading platform 12. The swivel base 13 can be swiveled about the vertical direction by a swivel motor. A boom 14 is provided on the swivel base 13 so as to be undulating. An undulating cylinder is provided between the swivel base 13 and the boom 14. The boom 14 undulates as the undulating cylinder expands and contracts. The boom 14 is configured in a telescopic shape. The boom 14 expands and contracts by an expansion / contraction cylinder provided inside.

A deck 15 whose posture is maintained horizontally by a leveling cylinder is provided at the tip of the boom 14. By combining the turning, undulating, and expanding / contracting of the boom 14, the deck 15 can be moved to an arbitrary position in the three-dimensional space. As a result, the worker who got into the deck 15 can work at a high place.

An outrigger device 1 is provided on the vehicle body 10 in order to ensure stability during work. The number of outrigger devices 1 is not particularly limited, but for example, they are provided at four locations on the front, rear, left, and right sides of the vehicle body 10.

(Outrigger device)
Next, the configuration of the outrigger device 1 will be described.
As shown in FIG. 2, the outrigger device 1 has an outrigger jack 20. The outrigger jack 20 is fixed to the vehicle body 10. The outrigger jack 20 may be fixed to a bracket provided on the vehicle body 10, or may be provided on the vehicle body 10 via an overhang mechanism capable of projecting in the vehicle width direction (y-axis direction).

The outrigger jacks 20 are arranged along the vertical direction (z-axis direction). Therefore, the outrigger jack 20 expands and contracts in the vertical direction (z-axis direction). A float 40 is connected to the lower end of the outrigger jack 20 via a connecting portion 30. At the time of jacking up, the outrigger jack 20 is extended and the float 40 is grounded.

As shown in FIG. 3, the outrigger jack 20 has a jack cylinder 21. The jack cylinder 21 is a hydraulic cylinder and has a cylinder tube 22 and a rod 23 inserted therein. The jack cylinder 21 is arranged along the vertical direction (z-axis direction) with the rod side facing downward. That is, the central axis O of the jack cylinder 21 is along the vertical direction (z-axis direction). The central axis O of the jack cylinder 21 does not have to be strictly along the vertical direction (z-axis direction), and may be slightly inclined.

The jack cylinder 21 is provided inside the outer cylinder 24 and the inner cylinder 25. The outer cylinder 24 is a square tubular member having a rectangular cross section, and has an opening at the lower end. The outer cylinder 24 is fixed to the vehicle body 10. The inner cylinder 25 is a square tubular member having a rectangular cross section, and is narrower than the outer cylinder 24. The inner cylinder 25 is inserted through the opening at the lower end of the outer cylinder 24.

The upper end of the outer cylinder 24 and the cap side end of the cylinder tube 22 are connected via a pin 26. Further, the lower end of the inner cylinder 25 and the tip of the rod 23 are connected via a second connecting shaft 34, which will be described later. Therefore, when the jack cylinder 21 is expanded and contracted, the inner cylinder 25 moves up and down with respect to the outer cylinder 24, and the outrigger jack 20 expands and contracts.

The rod side of the jack cylinder 21 may be directed upward. At this time, the rod 23 and the outer cylinder 24 may be connected, and the cylinder tube 22 and the inner cylinder 25 may be connected. Normally, the outer cylinder 24 is fixed to the vehicle body 10, and the inner cylinder 25 is inserted through the opening at the lower end of the outer cylinder 24. On the contrary, the inner cylinder 25 inserted through the opening at the upper end of the outer cylinder 24 may be fixed to the vehicle body 10. The cross-sectional shapes of the outer cylinder 24 and the inner cylinder 25 are usually rectangular, but may be other shapes such as hexagons.

Normally, the rod 23 of the jack cylinder 21 rotates about an axis with respect to the cylinder tube 22. On the other hand, the inner cylinder 25 does not rotate about the axis with respect to the outer cylinder 24. This is because the square tubular inner cylinder 25 is inserted into the square tubular outer cylinder 24. Since the jack cylinder 21 is connected to such an outer cylinder 24 and an inner cylinder 25, the rotation of the rod 23 with respect to the cylinder tube 22 around the axis is restricted. That is, the outer cylinder 24 and the inner cylinder 25 have a function as rotation prevention means for preventing rotation of the rod 23 around the axis.

As shown in FIG. 4, the connecting portion 30 mainly includes an upper member 31 and a lower member 32. The upper member 31 is provided at the lower end of the outrigger jack 20. The lower member 32 is provided on the upper surface of the float 40. The upper member 31 and the lower member 32 are rotatably connected via the first connecting shaft 33.

As shown in FIG. 6, the upper member 31 has two first plates 35, 35 arranged in the vehicle width direction (y-axis direction). The two first plates 35, 35 are arranged parallel to each other with a predetermined interval. The tip of the rod 23 is inserted between the two first plates 35, 35. Holes 35h are formed in each first plate 35. Further, a hole 23h is formed at the tip of the rod 23. The second connecting shaft 34 is passed through these holes 35h and 23h.

The upper member 31 is rotatably connected to the outrigger jack 20 via the second connecting shaft 34. The float 40 is rotatable about the second connecting shaft 34. Here, the second connecting shaft 34 is arranged along the vehicle width direction (y-axis direction). Therefore, the float 40 can rotate around the second rotation axis A2 along the vehicle width direction (y-axis direction). The second rotating shaft A2 coincides with the central axis of the second connecting shaft 34.

Both ends of the second connecting shaft 34 project outward from the first plates 35, 35. This protruding portion is passed through a hole formed at the lower end of the inner cylinder 25 (see FIG. 3). As a result, the inner cylinder 25 and the rod 23 are connected.

As shown in FIG. 5, the upper member 31 further has two second plates 36, 36 arranged in the front-rear direction (x-axis direction). The two second plates 36, 36 are arranged parallel to each other with a predetermined interval. The two first plates 35, 35 and the two second plates 36, 36 are joined to form the upper member 31.

The lower member 32 is composed of two third plates 37, 37 arranged in the front-rear direction (x-axis direction). Each third plate 37 is erected on the upper surface of the float 40. The two third plates 37, 37 are inserted between the two second plates 36, 36. A hole 36h is formed in each second plate 36. Further, holes 37h are formed in each third plate 37. The first connecting shaft 33 is passed through these holes 36h and 37h.

The float 40 is rotatable about the first connecting shaft 33. Here, the first connecting shaft 33 is arranged along the front-rear direction (x-axis direction). Therefore, the float 40 is rotatable around the first rotation axis A1 along the front-rear direction (x-axis direction). The first rotating shaft A1 coincides with the central axis of the first connecting shaft 33.

The float 40 is connected to the outrigger jack 20 via the first and second connecting shafts 33 and 34 that are orthogonal to each other. Therefore, the float 40 can be tilted in all directions. When jacked up against an inclined surface, the float 40 inclines to match the ground.

By the way, the tipping fulcrum of the aerial work platform AA at the time of jacking up is determined by the position of the rotation axis of the float 40 with respect to the outrigger jack 20. The conventional outrigger device has a configuration in which a spherical portion formed at the tip of the rod of the jack cylinder is received by a recess on the float side, and the overturning fulcrum is located on the central axis of the jack cylinder. On the other hand, in the outrigger device 1 of the present embodiment, as described below, the overturning fulcrum is arranged outside the central axis O of the jack cylinder 21 in the vehicle width direction (y-axis direction).

As shown in FIG. 6, the first connecting shaft 33 is arranged outside the central axis O of the jack cylinder 21 in the vehicle width direction (y-axis direction). That is, the first rotation axis A1 of the float 40 is arranged outside the vehicle width direction (y-axis direction) of the central axis O of the jack cylinder 21. Since the first rotation axis A1 is arranged along the front-rear direction (x-axis direction), it serves as a rollover fulcrum of the aerial work platform AA. The fact that the first rotating shaft A1 is arranged outside the central axis O of the jack cylinder 21 in the vehicle width direction (y-axis direction) means that the overturning fulcrum of the aerial work platform AA is located outside in the vehicle width direction. Means to move.

Then, the distance between the center of gravity of the aerial work platform AA and the overturning fulcrum becomes longer than when the overturning fulcrum is located on the central axis O of the jack cylinder 21. Therefore, the stability moment of the aerial work platform AA is increased, and the stability performance can be improved. This means that the stability performance is improved when the outrigger jack 20 has the same overhang width and is compared with the conventional technique.

As described above, since the stability performance of the aerial work platform AA is improved, the weight of the counterweight can be reduced. Although it depends on the configuration of the aerial work platform AA, for example, if the overturning fulcrum is moved 50 mm outward in the vehicle width direction, the weight of the counterweight can be reduced by 200 to 300 kg.

In order to maintain the state in which the first rotating shaft A1 is arranged outside in the vehicle width direction (y-axis direction), it is preferable that the connecting portion 30 does not rotate around the central axis O. In this respect, the outrigger jack 20 of the present embodiment has a configuration in which the inner cylinder 25 is inserted into the outer cylinder 24, and the inner cylinder 25 does not rotate about the axis with respect to the outer cylinder 24. Therefore, the state in which the first rotation axis A1 is arranged outside in the vehicle width direction (y-axis direction) can be maintained.

As shown in FIG. 7A, the first connecting shaft 33 is arranged at a position deviated from the center (center of gravity) of the float 40 in the vehicle width direction. The third plate 37 has a protrusion 37a on the upper portion on the side where the first connecting shaft 33 is inserted. When the float 40 is rotated counterclockwise in FIG. 7A, the protrusion 37a is locked to the first plate 35. This limits the float 40 from rotating any further.

The float 40 in a non-grounded state rotates due to its own weight. By locking the protrusion 37a to the first plate 35, this rotation is restricted and the float 40 is not excessively tilted. Since the inclination of the float 40 can be suppressed in the process of extending the outrigger jack 20, the float 40 does not pierce when it comes into contact with the ground.

As shown in FIG. 7B, the upper end surface of the third plate 37 is an inclined surface 37b. When the float 40 is rotated clockwise in FIG. 7B, the inclined surface 37b comes into contact with the first plate 35. This limits the float 40 from rotating any further.

As described above, the protruding portion 37a and the inclined surface 37b of the third plate 37 form a rotation limiting portion that limits the rotation of the lower member 32 with respect to the upper member 31 around the first connecting shaft 33 within a predetermined angle range.

As shown in FIG. 8A, the float 40 in a non-grounded state rotates due to its own weight. As a result, the side surface 37c of the third plate 37 on the side where the first connecting shaft 33 is inserted becomes an inclined surface that descends toward the outside. As the outrigger jack 20 in the extended state is contracted, the lower edge of the outer cylinder 24 comes into contact with the side surface 37c of the third plate 37. When the outrigger jack 20 is further contracted from this state, the lower edge of the outer cylinder 24 pushes the side surface 37c inward. As a result, the float 40 becomes horizontal.

As shown in FIG. 8B, when the outrigger jack 20 is completely contracted, the connecting portion 30 is housed inside the outer cylinder 24. Further, the opening of the outer cylinder 24 is closed by the float 40. Therefore, constituent members such as the jack cylinder 21, the inner cylinder 25, and the connecting portion 30 are housed inside the space closed by the outer cylinder 24 and the float 40.

As described above, the side surface 37c of the third plate 37 serves as a guide for making the float 40 horizontal by abutting on the outer cylinder 24 when the connecting portion 30 is inserted into the outer cylinder 24. With this guide, the posture of the float 40 can be smoothly leveled when the outrigger jack 20 is contracted.

The outrigger device 1 is often located behind the wheels (see FIG. 1). Therefore, the water splashed by the wheels while the vehicle is running may be splashed on the outrigger device 1. In the outrigger device 1 of the present embodiment, when the outrigger jack 20 is completely contracted, constituent members such as the connecting portion 30 are housed inside the outer cylinder 24. Therefore, the connecting portion 30 can be protected from water splashes while the vehicle is running. As a result, rust and the like of the connecting portion 30 can be prevented.

[Second Embodiment]
Next, the outrigger device according to the second embodiment will be described.
As shown in FIG. 9, also in this embodiment, the connecting portion 30 has an upper member 31 and a lower member 32. The first connecting shaft 33 is non-rotatably fixed to the upper member 31. The first connecting shaft 33 is inserted into the bearing hole 38 formed in the lower member 32. The first connecting shaft 33 may be fixed to the lower member 32 so as not to rotate. In this case, the first connecting shaft 33 is inserted into the bearing hole 38 formed in the upper member 31.

The first connecting shaft 33 is basically a round bar having a circular cross section. However, at least the upper part of the portion of the first connecting shaft 33 inserted into the bearing hole 38 is cut in a C shape. As a result, the upper portion (the portion above the central axis) of the first connecting shaft 33 is a wedge portion 33a that narrows upward. The lower portion 33b (the portion below the central axis) of the first connecting shaft 33 has a semicircular cross section.

The bearing hole 38 is basically a vertically long oval hole. However, the upper portion of the bearing hole 38 is formed in a V shape. As a result, the upper portion of the bearing hole 38 is an insertion portion 38a into which the wedge portion 33a is fitted. The lower portion 38b of the bearing hole 38 has a semicircular cross section. Further, since the bearing hole 38 is vertically long, a gap is provided in the vertical direction between the wedge portion 33a and the insertion portion 38a.

When the float 40 is in contact with the ground, the semicircular lower portion 33b of the first connecting shaft 33 comes into contact with the semicircular lower portion 38b of the bearing hole 38. Further, there is a gap between the wedge portion 33a and the insertion portion 38a. Therefore, the first connecting shaft 33 can rotate in a predetermined angle range with respect to the bearing hole 38. That is, the float 40 can rotate about the first connecting shaft 33. When jacked up against an inclined surface, the float 40 inclines to match the ground.

As shown in FIG. 10, when the float 40 is not in contact with the ground, the float 40 is suspended from the upper member 31. Therefore, the wedge portion 33a of the first connecting shaft 33 fits into the insertion portion 38a of the bearing hole 38, and the first connecting shaft 33 cannot rotate with respect to the bearing hole 38. As a result, the float 40 is maintained in a horizontal state. Since the float 40 can be kept horizontal in the process of extending the outrigger jack 20, the float 40 does not stick when it comes into contact with the ground.

[Third Embodiment]
Next, the outrigger device 3 according to the third embodiment will be described.
As shown in FIG. 11, the outrigger device 3 has an outrigger jack 20. Further, the outrigger jack 20 has a jack cylinder 21. The jack cylinder 21 is a hydraulic cylinder including a cylinder tube 22 and a rod 23. The jack cylinder 21 is arranged so that the central axis O is along the vertical direction (z-axis direction) with the rod side facing upward.

The jack cylinder 21 is provided inside the outer shell 27. The outer shell 27 is a tubular member and has an opening at the lower end. The outer shell 27 is fixed to the vehicle body 10. The upper end of the outer shell 27 and the tip of the rod 23 are connected via a pin 26. A float 40 is connected to the cap side end of the cylinder tube 22 via a connecting portion 50.

As shown in FIGS. 11 and 12, sliders 28 are fixed to both side surfaces of the cylinder tube 22. Further, as shown in FIG. 13, a rail 29 is fixed to the inner surface of the outer shell 27 at a position facing the slider 28. The rail 29 is a groove along the vertical direction (z-axis direction), and the slider 28 is fitted inside the groove. Therefore, the slider 28 is guided in the vertical direction (z-axis direction) by the rail 29.

By fitting the slider 28 to the rail 29, the rotation of the cylinder tube 22 around the axis with respect to the rod 23 is restricted. That is, the slider 28 and the rail 29 have a function as rotation prevention means for preventing rotation of the cylinder tube 22 around the axis. The slider 28 may be fixed to the outer shell 27, and the rail 29 may be fixed to the cylinder tube 22.

As shown in FIGS. 14 and 15, the connecting portion 50 includes an upper ring 51 and a lower ring 52. The upper ring 51 is a semicircular (U-shaped) ring, which is provided at the lower end of the outrigger jack 20 (cylinder tube 22). The lower ring 52 is a semicircular (inverted U-shaped) ring, which is provided on the upper surface of the float 40. The lower ring 52 passes through the hole of the upper ring 51. That is, the upper ring 51 and the lower ring 52 are connected to each other.

The upper ring 51 is arranged along the vertical plane along the front-rear direction (x-axis direction). Further, the lower ring 52 is arranged along the vertical plane along the vehicle width direction (y-axis direction). That is, the upper ring 51 and the lower ring 52 are arranged so as to be orthogonal to each other.

The float 40 is rotatable around the first rotation axis A1 along the front-back direction (x-axis direction). The first rotation axis A1 coincides with the center of the top of the upper ring 51. Further, the float 40 can rotate around the second rotation axis A2 along the vehicle width direction (y-axis direction). The second axis of rotation A2 coincides with the center of the top of the lower ring 52. Since the float 40 can rotate around the first and second rotation axes A1 and A2 that are orthogonal to each other, it can be tilted in all directions.

As shown in FIG. 15, the upper ring 51 is arranged outside the vehicle width direction (y-axis direction) of the central axis O of the jack cylinder 21. Therefore, the first rotation axis A1 of the float 40 is arranged outside the vehicle width direction (y-axis direction) of the central axis O of the jack cylinder 21. This means that the fall fulcrum of the aerial work platform AA moves outward in the vehicle width direction. Therefore, the stability moment of the aerial work platform AA is increased, and the stability performance can be improved.

The arrangement of the upper ring 51 and the lower ring 52 may be reversed. That is, the lower ring 52 is arranged along the vertical plane along the front-rear direction (x-axis direction) and along the vertical plane arranged outside the vehicle width direction from the central axis O. Further, the upper ring 51 is arranged along the vertical plane along the vehicle width direction (y-axis direction). In this case, the first rotation axis A1 of the float 40 coincides with the center of the top of the lower ring 52 and is arranged outside in the vehicle width direction (y-axis direction). Therefore, similarly, the stability moment of the aerial work platform AA is increased, and the stability performance can be improved.

In order to maintain the state in which the first rotating shaft A1 is arranged outside in the vehicle width direction (y-axis direction), it is preferable that the connecting portion 30 does not rotate around the central axis O. In this respect, the outrigger jack 20 of the present embodiment has a structure in which the slider 28 is fitted to the rail 29, and the cylinder tube 22 does not rotate about the axis. Therefore, the state in which the first rotation axis A1 is arranged outside in the vehicle width direction (y-axis direction) can be maintained.

A small piece 53 is fixed to the outer peripheral surface of the lower ring 52. Since the first rotation axis A1 is arranged at a position deviated from the center of gravity of the float 40, the float 40 in a non-grounded state rotates due to its own weight. By locking the small piece 53 to the lower end of the cylinder tube 22, this rotation is restricted and the float 40 does not tilt excessively. In this way, the small piece 53 constitutes a rotation limiting portion that limits the rotation of the float 40 to a predetermined angle range.

AA Aerial work platform 1 Outrigger device 20 Outrigger jack 21 Jack cylinder 24 Outer cylinder 25 Inner cylinder 30 Connecting part 31 Upper member 32 Lower member 33 First connecting shaft 34 Second connecting shaft 40 Float

Claims (11)

An outrigger device installed in a work vehicle.
An outrigger jack having a jack cylinder arranged along the vertical direction of the work vehicle,
A float that touches the ground when jacking up,
A connecting portion for connecting the outrigger jack and the float is provided.
A rotation axis of the float with respect to the outrigger jack, wherein a first rotation axis along the front-rear direction of the work vehicle is arranged outside the central axis of the jack cylinder in the vehicle width direction. Outrigger device. The connecting part
The upper member provided on the outrigger jack and
The lower member provided on the float and
A first connecting shaft for rotatably connecting the upper member and the lower member is provided.
The outrigger according to claim 1, wherein the first connecting shaft is arranged along the front-rear direction of the work vehicle and is arranged outside the central axis of the jack cylinder in the vehicle width direction. apparatus. The outrigger device according to claim 2, wherein the connecting portion includes a rotation limiting portion that limits the rotation of the lower member with respect to the upper member around the first connecting axis within a predetermined angle range. The first connecting shaft is fixed to one of the upper member and the lower member, and is inserted into a bearing hole formed in the other.
The first connecting shaft has a wedge portion that narrows upward.
The bearing hole has an insertion portion into which the wedge portion is fitted.
The outrigger device according to claim 2, wherein a gap is provided in the vertical direction between the wedge portion and the insertion portion. The connecting portion includes a second connecting shaft that rotatably connects the outrigger jack and the upper member.
The outrigger device according to any one of claims 2 to 4, wherein the second connecting shaft is arranged along the vehicle width direction. The connecting part
The upper ring provided on the outrigger jack and
A lower ring provided on the float and passing through a hole in the upper ring.
One of the upper ring and the lower ring is a vertical plane along the front-rear direction of the work vehicle, and is arranged along the vertical plane arranged outside the central axis of the jack cylinder in the vehicle width direction. Cylinder
The outrigger device according to claim 1, wherein the upper ring and the other of the lower rings are arranged along a vertical plane along the vehicle width direction. The outrigger jack
A square tubular outer cylinder connected to one of the cylinder tube and rod of the jack cylinder,
The outrigger device according to any one of claims 1 to 6, further comprising a square tubular inner cylinder connected to the cylinder tube and the other of the rod and inserted into the outer cylinder. The inner cylinder is inserted through the opening at the lower end of the outer cylinder.
The outrigger device according to claim 7, wherein when the jack cylinder is contracted, the connecting portion is housed inside the outer cylinder and the float closes the opening. The outrigger device according to claim 8, wherein the connecting portion includes a guide that abuts on the outer cylinder to level the float when the connecting portion is inserted into the outer cylinder. The outrigger jack
The outer shell connected to the rod of the jack cylinder and
A slider fixed to one of the cylinder tube of the jack cylinder and the outer shell,
The outrigger device according to any one of claims 1 to 6, further comprising a rail for guiding the slider fitted to the other of the cylinder tube and the outer shell in the vertical direction. A work vehicle comprising the outrigger device according to any one of claims 1 to 10.