JP2012111398A - Outrigger of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outrigger of a working vehicle that can secure a required overhang dimension of a grounding plate while preventing disturbance of a ground contact surface by the grounding plate without enlarging the width direction dimension of the vehicle.SOLUTION: The outrigger of the working vehicle includes: a hydraulic cylinder 2 in which an end of a rod part 2b is swingably connected with a bracket 1; a first link member 4 of which one end side is swingably connected to a cylinder part 2a of the hydraulic cylinder 2; and a second link member 5 and a third link member 6 whose one end sides are swingably connected to the first link member 4, and the other end sides are swingably connected to the bracket 1. Thereby, when elongating the hydraulic cylinder 2 from all shortened states, after moving the grounding plate 3 to outer side in width direction of the vehicle, while moving it downward by first to third link members 4, 5, and 6, movement to downward in an almost vertical direction becomes possible near the ground contact surface G, and the required overhang dimension of the grounding plate 3 can be secured while preventing disturbance of ground contact surface G by grounding plate 3, without enlarging the vehicle dimension in the width direction.

Description

  The present invention relates to an outrigger of a work vehicle such as an aerial work vehicle or a mobile crane.

  Conventionally, in an outrigger of this type of work vehicle, a hydraulic cylinder that is swingably supported by a member on the vehicle side, and a link for swinging the lower end side of the cylinder outward in the width direction of the vehicle by the extension operation of the hydraulic cylinder And a grounding plate provided at the lower end of the hydraulic cylinder, and extending the hydraulic cylinder from the fully shortened state so that the lower end of the hydraulic cylinder protrudes outward in the width direction to ground the grounding plate to the grounding surface. There is known one that ensures the stability of a work vehicle (see, for example, cited document 1).

  The outrigger has one end portion swingably supported by a member on the vehicle side, and the other end portion is supported by the hydraulic cylinder so as to be swingable. It moves to the outside. For this reason, when the hydraulic cylinder extends from the fully shortened state, the link member moves in an arc shape with the one end side supported by the vehicle as the rotation center. In this case, since the grounding plate provided at the lower end of the hydraulic cylinder also moves in an arc shape, the grounding plate that is in contact with the grounding surface is a vehicle with respect to the grounding surface until the hydraulic cylinder is fully extended. May move in the width direction and disturb the ground contact surface.

  Therefore, in order to prevent the grounding surface from being disturbed by the grounding plate when the hydraulic cylinder is extended, the hydraulic cylinder that is swingably supported by the vehicle, and the lower end side of the hydraulic cylinder are moved vertically and downward by the extending operation of the hydraulic cylinder. A guide body for guiding the vehicle in the width direction of the vehicle and a grounding plate provided at the lower end of the hydraulic cylinder, and when the hydraulic cylinder is extended from the fully shortened state, the grounding plate is moved downward. In addition, it is known that it projects outward in the width direction and the ground plate is moved substantially vertically downward in the vicinity of the ground surface so as to be grounded substantially perpendicular to the ground surface (see, for example, Reference 2). .

  In addition, as other outriggers that can prevent the grounding surface from being disturbed by the grounding plate, a hydraulic cylinder supported by the vehicle with the extending direction facing up and down, and a grounding plate provided at the lower end of the hydraulic cylinder are provided. In addition, there is known one in which the hydraulic cylinder is extended from the fully shortened state so that the ground plate is grounded substantially perpendicularly to the ground plane (see, for example, cited document 3).

Japanese Utility Model Publication No. 34-17411 Japanese Patent No. 3411970 JP 2008-307925 A

  However, in the outrigger that guides the lower end side of the hydraulic cylinder with the guide body, it is necessary to increase the width direction dimension of the guide body in order to increase the projecting dimension of the ground plate to the outside in the width direction of the vehicle. Since the vehicle has a limitation in dimension in the width direction in order to travel on a public road, there are cases where the required projecting dimension of the ground plate cannot be ensured.

  Further, in the outrigger in which the hydraulic cylinder is expanded and contracted in the vertical direction, a mechanism for moving the hydraulic cylinder in the width direction of the vehicle is required in order to increase the projecting dimension of the ground plate. The mechanism for moving the hydraulic cylinder in the width direction of the vehicle has a width-direction dimension corresponding to the required overhang dimension. Since the vehicle has a limitation in dimension in the width direction in order to travel on a public road, there are cases where the required projecting dimension of the ground plate cannot be secured. In addition, a separate mechanism for moving the hydraulic cylinder in the width direction is required, which may increase the manufacturing cost.

  An object of the present invention is to provide an outrigger for a work vehicle that can prevent a ground surface from being disturbed by a ground plate without increasing the width-direction size of the vehicle and can secure a required ground plate extension dimension. And

  In order to achieve the above object, the present invention comprises a hydraulic cylinder comprising a cylinder portion and a rod portion, and an end portion of the rod portion is connected to a vehicle-side member so as to be swingable in the vehicle width direction; And a ground link plate provided at an end portion of the cylinder portion of the hydraulic cylinder, a first link member having one end side pivotably connected to the cylinder portion of the hydraulic cylinder, The second side is swingably connected to the other end side of the first link member, and the other end side is swingably connected to the vehicle side member located below the connecting portion between the vehicle side member and the hydraulic cylinder. The link member and one end side are swingably connected between a connecting portion of the first link member connected to the hydraulic cylinder and a connecting portion of the second link member, and the other end side is connected to the vehicle side member and the second link member. The vehicle side member located below the connecting part of A third link member that is freely connected, and when the hydraulic cylinder extends from the fully shortened state, the ground plate moves downward and moves outward in the width direction of the vehicle body, and then substantially in the vicinity of the ground plane. It is configured to move vertically downward.

  According to the present invention, when the hydraulic cylinder is extended from the fully shortened state, the first to third link members move the grounding plate downward and move it outward in the width direction of the vehicle, and then near the grounding surface. The grounding plate can be moved almost vertically downward in the vehicle, preventing the grounding surface from being disturbed by the grounding plate and ensuring the required grounding plate overhang without increasing the width of the vehicle. It becomes possible to do.

1 is an overall perspective view of an outrigger for a work vehicle showing an embodiment of the present invention. It is sectional drawing which looked at the outrigger of the working vehicle of the state which all the hydraulic cylinders shortened from the front side of the vehicle. It is the figure seen from the front of the vehicle of the outrigger of the working vehicle of the state which fully extended the hydraulic cylinder. It is operation | movement explanatory drawing of the outrigger of a working vehicle.

  1 to 4 show an embodiment of the present invention.

  The outrigger of the working vehicle of the present invention is provided on both sides of the front and rear of the vehicle of the aerial work vehicle, and supports the vehicle during the aerial work in a stable state.

  As shown in FIG. 1, the outrigger includes a hydraulic cylinder 2 that is swingably connected to a bracket 1 as a vehicle-side member in the vehicle width direction, and a contact provided on the lower end side of the hydraulic cylinder 2. A base plate 3, a pair of first link members 4 swingably connected to the hydraulic cylinder 2, a second link member 5 swingably connecting the bracket 1 and the first link member 4, and a pair of first links. 3 link members 6 are provided.

  The bracket 1 is a member extending in the vertical direction in which a concave portion 1a is formed on the outer side surface in the width direction of the vehicle. As shown in FIG. 2, the hydraulic cylinder 2 is provided in the concave portion 1a so as to be accommodated.

  The hydraulic cylinder 2 includes a cylinder portion 2a and a rod portion 2b, and an end portion of the rod portion 2b is connected to the upper portion of the bracket 1 via a support shaft 7 so as to be swingable.

  The ground plate 3 is made of a rectangular plate-like member, and is connected to the end portion of the cylinder portion 2a of the hydraulic cylinder 2 through a connecting portion 8 so as to be swingable.

  Each first link member 4 is made of a member having substantially the same longitudinal dimension as the cylinder portion 2 a of the hydraulic cylinder 2, and one end side of the first link member 4 is disposed on both sides in the vehicle front-rear direction of the cylinder portion 2 a of the hydraulic cylinder 2 via support shafts 9. It is swingably connected.

  The second link member 5 is made of a member having a longitudinal dimension that is approximately half the longitudinal dimension of the first link member 4. One end side of the second link member 5 is swingably connected to the other end side of the pair of first link members 4 via a support shaft 10, and the other end side of the vehicle of the bracket 1 positioned below the support shaft 7. A connecting piece 1b provided on the inner side surface in the width direction is connected through a support shaft 11 so as to be swingable. One end side of the second link member 5 is located between the other end sides of the pair of first link members 4.

  Each third link member 6 is made of a member having substantially the same longitudinal dimension as the second link member 5. Each third link member 6 has one end side between a support shaft 9 that connects the hydraulic cylinder 2 of the first link member 4 and a support shaft 10 that connects the second link member 5 (approximately the center in the longitudinal direction). The other end of the bracket 1 is pivotably connected to the lower end side of the bracket 1 located below the support shaft 11 via the support shaft 13. One end side of each third link member 6 is positioned on the outer side in the vehicle front-rear direction of each first link member 4.

  Here, the distance between the support shaft 11 that connects the second link member 5 and the bracket 1 and the support shaft 13 that connects the third link member 6 and the bracket 1 is defined as a first distance L1. Further, the distance between the support shaft 10 that connects the first link member 4 and the second link member 5 and the support shaft 12 that connects the first link member 4 and the third link member 6 is the second distance. The distance is L2. Further, the distance between the support shaft 11 that connects the second link member 5 and the bracket 1 and the support shaft 10 that connects the first link member 4 and the second link member 5 is the third distance L3. To do. The distance between the support shaft 13 that connects the third link member 6 and the bracket 1 and the support shaft 12 that connects the first link member 4 and the third link member 6 is the fourth distance L4. To do. Regarding the first to fourth distances L1 to L4, the total distance of the first distance L1 and the third distance L3 is smaller than the total distance of the second distance L2 and the fourth distance L4 ( L1 + L3 <L2 + L4). In the present embodiment, since the third distance L3 and the fourth distance L4 are substantially the same distance, as shown in FIG. 3, the first distance L1 has a relationship smaller than the second distance (L1 < L2).

  In the outrigger of the work vehicle configured as described above, when the hydraulic cylinder 2 is in a fully shortened state, the hydraulic cylinder 2 has a posture along the longitudinal direction of the bracket 1 as shown in FIG. It is the state accommodated in the recessed part 1a. At this time, the 1st link member 4 connected with the cylinder part 2a becomes the attitude | position extended diagonally downward toward the other end side from one end side.

  When the hydraulic cylinder 2 is extended from the fully shortened state, the cylinder portion 2a of the hydraulic cylinder 2 moves downward, and the first link member 4 connected to the cylinder portion 2a also moves together with the cylinder portion 2a. At this time, the change in the posture of the third link member 6 is small until the first link member 4 turns the longitudinal direction in the substantially horizontal direction, and the first link member 4 mainly swings around the support shaft 12. One end portion of the first link member 4 moves in an arc shape with the support shaft 12 as the center, as indicated by a one-dot chain line T1 in FIGS. As a result, the grounding plate 3 provided at the lower end of the hydraulic cylinder 2 connected to one end of the first link member 4 is also grounded as shown by the two-dot chain line T2 in FIGS. It moves downward in the vicinity of G and in an arc shape toward the outside in the width direction of the vehicle.

  When the first link member 4 further moves from the state in which the longitudinal direction is substantially horizontal to the lower side than the other end portion, the first link member 4 further moves the support shaft 12 in accordance with the extension of the hydraulic cylinder 2. As the third link member 6 swings about the support shaft 13 to the outside in the width direction of the vehicle, the one end portion of the first link member 4 is moved to the center of FIG. 4D to FIG. As indicated by the alternate long and short dash line T1, it moves linearly downward substantially vertically. As a result, the grounding plate 3 provided at the lower end of the hydraulic cylinder 2 also moves linearly downward in the vertical direction and contacts the grounding surface G, as shown in FIGS. The hydraulic cylinder 2 is fully extended and the vehicle is lifted upward and supported.

  On the other hand, when the hydraulic cylinder 2 in the fully extended state is shortened, the grounding plate 3 moves in a substantially vertical upward direction until it moves slightly upward from the grounding surface G, and then moves in an arc shape. In the recess 1a.

  Thus, according to the outrigger of the working vehicle of this embodiment, the end of the rod portion 2b is connected to the bracket 1 in a swingable manner, and the one end side of the hydraulic cylinder 2 is connected to the cylinder portion 2a. A first link member 4 that is swingably connected to one end side of a support shaft 7 that is swingably connected to the other end side of the first link member 4, and the other end side connects the bracket 1 and the hydraulic cylinder 2. A second link member 5 that is swingably connected to the bracket 1 positioned below, a support shaft 9 that connects the first link 4 member and the hydraulic cylinder 2 at one end side, the first link member 4 and the second link member. The other end side is swingably connected to the bracket 1 positioned below the support shaft 11 connecting the bracket 1 and the second link member 5. A third link member 6 That. Thus, after the hydraulic cylinder 2 is extended from the fully shortened state, the ground plate 3 is moved downward and moved outward in the vehicle width direction by the first to third link members 4, 5, 6. In the vicinity of the ground plane G, it is possible to move substantially downward in the vertical direction, preventing the ground plane G from being disturbed by the ground plane 3 and increasing the required width of the ground plane 3 without increasing the widthwise dimension of the vehicle. It is possible to ensure the overhang dimension.

  In addition, the total distance between the first distance L1 and the third distance L3 is smaller than the total distance between the second distance L2 and the fourth distance L4. As a result, the ground plate 3 can be reliably moved substantially vertically downward in the vicinity of the ground plane G.

  The third distance L3 and the fourth distance L4 are substantially the same distance, and the first distance L1 is configured to be smaller than the second distance. Thereby, the 2nd link member 5 and the 3rd link member 6 can be made shared, and it becomes possible to aim at reduction of manufacturing cost.

  In addition, the outrigger of the said embodiment is not restricted to what is applied to an aerial work vehicle, For example, all the work vehicles which need to support a vehicle stably during work, such as a mobile crane and a concrete pump vehicle, are carried out. It is applicable to.

  Further, the outriggers of the above embodiment are not limited to those provided on both sides in the width direction before and after the vehicle, and may include a pair of outriggers on both the left and right sides of the vehicle.

DESCRIPTION OF SYMBOLS 1 Bracket 2 Hydraulic cylinder 3 Grounding plate 4 1st link member 5 2nd link member 6 3rd link member 7 Support shaft 8 Connecting part 9-13 Support shaft

Claims (3)

The hydraulic cylinder is composed of a cylinder part and a rod part, and an end part of the rod part is connected to a member on the vehicle side so as to be swingable in the width direction of the vehicle, and provided at an end part of the cylinder part of the hydraulic cylinder In an outrigger of a work vehicle provided with a ground plate,
A first link member whose one end is swingably connected to a cylinder portion of the hydraulic cylinder;
One end side is swingably connected to the other end side of the first link member, and the other end side is swingably connected to a vehicle side member positioned below a connecting portion between the vehicle side member and the hydraulic cylinder. Two link members;
One end side is swingably connected between a connecting portion of the first link member with the hydraulic cylinder and a connecting portion of the second link member, and the other end side of the connecting portion between the vehicle side member and the second link member. A third link member swingably connected to a vehicle-side member located below,
When the hydraulic cylinder is extended from the fully shortened state, the grounding plate is configured to move downward and move outward in the width direction of the vehicle body, and then move downward substantially vertically near the grounding surface. Outrigger for working vehicles. The distance between the connecting portion between the second link member and the vehicle-side member and the connecting portion between the third link member and the vehicle-side member is configured to be a predetermined first distance,
The distance between the connecting portion between the first link member and the second link member and the connecting portion between the first link member and the third link member is configured to be a predetermined second distance,
The distance between the connecting portion between the second link member and the vehicle-side member and the connecting portion between the second link member and the first link member is configured to be a predetermined third distance,
The distance between the connecting portion between the third link part and the vehicle-side member and the connecting portion between the third link member and the first link member is configured to be a predetermined fourth distance,
The outrigger for a work vehicle according to claim 1, wherein a total distance of the first distance and the third distance is configured to be smaller than a total distance of the second distance and the fourth distance. The third distance is configured to be substantially the same distance as the fourth distance,
The outrigger for a work vehicle according to claim 2, wherein the first distance is configured to be smaller than the second distance.

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