JP2001048489A - Work bucket fitting structure of vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce width size by vertically extending an expasible axis line astride between side plates of post members and in the tip part of a boom. SOLUTION: A bearing mechanism and a center axis 12c of rotation are passed through a space in the vicinity of an axis 7c of a pivotal support shaft 7 for supporting a post member 8 to freely oscillate, and disposed on an upper connecting member 8b of the post member 8. A post side support point shaft 9 of a double-acting hydraulic cylinder 11 connected to the post member 8 has the post member 8 disposed in a position passing the vicinity of the central axis 12c of rotation. The double-acting hydraulic cylinder 11 has the expansible axis passed through the axis 9c of the post side support point shaft 9 and the axis 7c of the boom forward end support point shaft 7, and disposed to be vertically extended between a pair of right and left side plates and in the tip end part of a boom 3. Accordingly, the post member 8 and the width size L can be reduced o as to improve work efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a work bucket to a boom tip of a high-altitude work vehicle having a work bucket attached to a tip of a boom that can be raised and lowered so as to be able to turn horizontally. It is.

[0002]

2. Description of the Related Art As shown in FIG. 3, a boom 4 has a base end mounted on a swivel 2 mounted on a vehicle 1 so as to be rotatable via a shaft 3 as shown in FIG. The swivel 2 and the boom 4 are positioned below the boom 4.
And a work bucket 6 attached to the tip of the boom 4 so as to be able to turn horizontally via a work table attachment mechanism.

As shown in FIG. 4, a conventional work bucket mounting structure includes a swing fulcrum shaft 7 having a lower end swinging at the tip of the boom 4 along the up and down direction of the boom 4.
And the post member 8 erected by connecting through the
And a double-acting hydraulic cylinder 11 for maintaining the swinging posture of the boom 4 in a predetermined posture irrespective of the up-and-down movement of the boom 4, and the work bucket 6 interposed between the work bucket 6 and the upper end of the post member 8. Bearing mechanism 1 that enables horizontal turning
2 is comprised.

The double-acting hydraulic cylinder 11 is provided at a position closer to the base end of the boom 4 than the post-side fulcrum shaft 9 provided at a position near the upper end of the post member 8 and the swing fulcrum shaft 7 at the tip of the boom 4. It is vertically disposed between the post member 8 and the tip of the boom 4 via the boom tip-side fulcrum shaft 10, and the mounting relationship is the pivoting of the boom up / down fulcrum shaft 3 of the boom 4 and the boom up / down cylinder 5. A triangle formed by the platform-side fulcrum shaft 5a and the boom-side fulcrum shaft 5b of the boom undulating cylinder 5 (hereinafter referred to as a boom undulation-related triangle), a swing fulcrum shaft 7 of the post member 8, a post-side fulcrum shaft 9, and A triangle formed by the boom tip-side fulcrum shaft 10 (hereinafter referred to as a post member swing related triangle) is attached so as to always maintain a similar triangle. The double-acting hydraulic cylinder 11 expands and contracts in conjunction with expansion and contraction driving of the boom hoist cylinder 5. This interlocking ratio is set to be the same as the similarity ratio of the post member swing related triangle to the boom undulation related triangle.

More specifically, the relationship between the effective pressure receiving area of the pressure operation chamber on the reduction operation side (piston rod side oil chamber) of the boom hoist cylinder 5 and the effective pressure reception area of the expansion operation side pressure oil chamber of the double-acting hydraulic cylinder 11 is described. After setting a value corresponding to the reciprocal of the similarity ratio, these two oil chambers are connected, and the extension operation side pressure oil chamber of the boom hoist cylinder 5 and the reduction operation side pressure oil chamber of the double acting hydraulic cylinder 11 (piston rod side oil chamber) ) Is supplied and discharged through a four-way three-position type directional control valve (not shown).

The bearing mechanism 12 is interposed between a support bracket 6 a extending from one side of the work bucket 6 and an upper end of the post member 8. The bearing mechanism 12 allows the work bucket 6 to be horizontally turned around the post member 8 at a position where at least a lower portion of the work bucket 6 wraps with the post member 8 in the height direction.

In this type of work bucket mounting structure, the similarity ratio of the post member swing related triangle to the boom undulation related triangle is set as small as possible in order to reduce the size thereof. The relationship between the effective pressure receiving area of the pressure operation chamber on the reduction operation side (piston rod side oil chamber) of the boom hoist cylinder 5 and the effective pressure reception area of the pressure operation chamber on the extension operation side of the double acting hydraulic cylinder 11 is a value corresponding to the reciprocal of the similarity ratio. Therefore, there is a characteristic that the outer shape of the cylinder 11a of the double-acting hydraulic cylinder 11 becomes large.

The present invention relates to a work bucket mounting structure for an aerial work vehicle described above.

By the way, as shown in FIGS. 3 and 4, this type of conventional work bucket mounting structure is such that a double-acting hydraulic cylinder 11 having a large outer shape of a cylinder 11 a Are arranged in the vertical direction so as to be located on the rear side (the base end side of the boom 3) of the post member 8, so that the width dimension (front-rear dimension) of the post member 8 and the double-acting hydraulic cylinder 11 is double-acting. The size of the hydraulic cylinder 11 was increased over the entire length direction. In particular, an increase in the width dimension (dimension in the front-rear direction) L of the post member 8 and the double-acting hydraulic cylinder 11 in the upper part of the double-acting hydraulic cylinder 11 increases the workability at the time of working at a high place. there were.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned problem of the conventional work bucket mounting structure for a high-altitude work vehicle. It is an object of the present invention to provide a work bucket mounting structure in which a width dimension (front and rear dimension) L of the member 8 and the double-acting hydraulic cylinder 11 can be significantly reduced as compared with a conventional one.

[0011]

According to the present invention, a work bucket mounting structure for an aerial work vehicle according to the present invention has a structure in which a post member 8 and a post have a structure different from the conventional work bucket mounting structure. The arrangement of the bearing mechanism with respect to the member 8 and the arrangement of the double-acting hydraulic cylinder 11 with respect to the post member 8 are modified as follows.

The post member 8 is a pair of left and right side plate members 8 a, 8 a slidably attached at the lower end to the tip of the boom 4 via the fulcrum shaft 7. Cylinder 11a in cylinder 11
And a pair of left and right side plate members 8a, 8a, an upper connecting member 8b for firmly connecting the upper ends of the pair of left and right side plate members 8a, 8a, and a pair of left and right side plate members 8a, 8a. And a front connecting member 8c for fixedly connecting the front ends of the booms 4a to 8b with a structure in which the rear end of the boom 4 at the base end is open.

The bearing mechanism 12 is disposed on the upper connecting member 8 b of the post member 8 so that the pivot center axis 12 c passes through the space and passes near the axis 7 c of the pivot shaft 7. ,

The post-side fulcrum shaft 9 is disposed on the post member 8 at a position such that the axis 9c of the post-side fulcrum shaft 9 passes near the turning center axis 12c, and the double-acting hydraulic cylinder 11 is The telescopic axis line 11c passes through the axis line 9c of the post-side fulcrum shaft 9 and the axis line 9c of the boom tip-side fulcrum shaft 9, so that the pair of left and right side plates 8a And between the two end plates of the boom 4 (between both side plates) so as to extend vertically.

[0015]

The work bucket mounting structure for an aerial work vehicle according to the present invention configured as described above has a double-acting hydraulic cylinder 11
The upper part of the post member 8 is wrapped in the width direction (the front-rear direction) of the post member 8 and the pair of left and right side plate members 8
a, 8a, the post member 8 and the double-acting hydraulic cylinder 11
Can be greatly reduced as compared with the conventional one.

[0016]

An embodiment of the present invention will be described below with reference to FIGS. As described above, the work bucket mounting structure of the aerial work vehicle according to the present invention has a structure of the post member 8 and an arrangement relationship of the bearing mechanism with respect to the post member 8 with respect to the conventional work bucket mounting structure.
Further, since the arrangement of the double-acting hydraulic cylinder 11 with respect to the post member 8 is changed, in the following description,
This modified portion will be described, and the configuration of the other portions will be referred to the above description of the related art.

(Regarding Structure of Post Member 8) FIGS.
As shown in FIG. 2, the post member 8 includes a pair of left and right side plate members 8 a, 8 a whose lower ends are swingably attached to the distal end of the boom 4 via the swing fulcrum shaft 7. The boom 4 includes an upper connecting member 8b for firmly connecting the upper ends of the side plate members 8a and 8a, and a front connecting member 8c for firmly connecting the front ends of the pair of left and right side plate members 8a. It has a structure with an open space at the rear, which is the base direction. A sufficient distance is provided between the left and right side plate members 8a, 8a to accommodate the cylinder 11a of the double-acting hydraulic cylinder 11.

(Regarding the arrangement of the bearing mechanism with respect to the post member 8) The bearing mechanism 12 f and its pivoting center axis 12 c pass through the space and pivotally support the post member 8. It is arranged on the upper connecting member 8b of the post member 8 so as to pass through the vicinity of 7c.

(Regarding the Arrangement of the Double-acting Hydraulic Cylinder 11 with respect to the Post Member 8) The post-side fulcrum shaft 9 connected to the post member 8 of the double-acting hydraulic cylinder 11 has an axis 9 c near the turning center axis 12 c. It is arranged on the post member 8 at a position where it passes. The double-acting hydraulic cylinder 11 is configured such that its telescopic axis 11c has an axis 9c of the post-side fulcrum 9 and an axis 7c of the boom tip-side fulcrum 7.
c, the post member 8 is arranged so as to extend in the vertical direction so as to extend between the pair of left and right side plates 8a, 8a of the post member 8 and the inside of the front end portion of the boom 3 (between both side plates). .

In the embodiment shown in FIGS. 1 and 2, the double-acting hydraulic cylinder 11 has its cylinder 11a side connected to the post member 8 by the post-side fulcrum shaft 9 at an intermediate position in the longitudinal direction, and its piston The distal end of the rod 11b is connected to the distal end of the boom 4 via the boom distal end fulcrum shaft 10. In such a case, the post can be moved without sacrificing the effective telescopic stroke of the double-acting hydraulic cylinder 11. The shape of the triangle related to the member swing can be reduced,
This has the effect of making the work bucket mounting structure compact.

However, the work bucket mounting structure of the present invention is applied to the cylinder 11 of the double-acting hydraulic cylinder 11.
a is connected to the post member 8 by the post-side fulcrum shaft 9, and the piston rod 1 of the double-acting hydraulic cylinder 11 is
1b is connected to the boom tip side fulcrum shaft 10 by the boom 4
The bottom end of the cylinder 11a of the double-acting hydraulic cylinder 11 may be connected to the tip of the boom 4 by the boom tip-side fulcrum shaft 10, and the piston rod of the double-acting hydraulic cylinder 11 may be connected. The tip of 11b may be connected to the post member 8 by the post-side fulcrum shaft 9. In any case, a pair of left and right side plate members 8a, 8 of the post member 8 is provided in a state where the upper portion of the double-acting hydraulic cylinder 11 is wrapped in the width direction (the front-rear direction) of the post member 8.
a, the width L (the front-rear dimension) of the post member 8 and the double-acting hydraulic cylinder 11 in the upper part of the double-acting hydraulic cylinder 11 is significantly reduced as compared with the conventional one. You can do it.

[0022]

The work bucket mounting structure for an aerial work vehicle according to the present invention configured and operated as described above is different from the conventional work bucket mounting structure in the structure of the post member 8 and the arrangement of the bearing mechanism with respect to the post member 8. The width of the post member 8 and the double-acting hydraulic cylinder 11 in the upper part of the double-acting hydraulic cylinder 11 is a simple configuration in which the relationship and the arrangement of the double-acting hydraulic cylinder 11 with respect to the post member 8 are changed. (Length in the front-rear direction) can be significantly reduced as compared with the conventional one, and the workability of the aerial work vehicle can be improved accordingly.

[Brief description of the drawings]

FIG. 1 is a side view of a work bucket mounting structure portion of an aerial work vehicle according to the present invention.

FIG. 2 is a view taken in the direction of arrows XX in FIG. 1;

FIG. 3 is a side view of an aerial work vehicle equipped with a conventional work bucket mounting structure.

FIG. 4 is a side view of a work bucket mounting structure of a conventional aerial work vehicle.

[Explanation of symbols]

1; vehicle, 2; turntable, 3; undulating fulcrum axis, 4; boom,
5; Boom hoist cylinder, 5a;
b; boom-side fulcrum shaft, 6; work bucket, 6a; support bracket, 7; swing fulcrum shaft (of post member 8), 7c;
Axial line, 8; post member, 8a, 8a; side plate member, 8
b; upper connecting member, 8c; front connecting member, 9; post-side fulcrum shaft (of double-acting hydraulic cylinder 11), 9c;
0: boom tip side support shaft, 10c: axis, 11: double acting hydraulic cylinder, 11a: cylinder, 11b; piston rod, 11c: telescopic axis, 12: bearing mechanism, 1
2c: center axis of rotation, L: width of post member 8 and double-acting hydraulic cylinder 11

Claims (1)

[Claims] 1. A swivel 2 mounted on a vehicle 1 so as to be free to swivel.
A boom 4 whose base end is rotatably mounted via an up / down fulcrum shaft 3; a boom up / down cylinder 5 interposed between the swivel base 2 and the boom 4 so as to be located below the boom 4; And a workbench mounting mechanism A at the end of the boom 4
The work bucket mounting structure in an aerial work vehicle provided with a work bucket 6 which is mounted so as to be freely rotatable horizontally through the lower end of the work bucket 6, wherein a lower end of the work bucket 6 is swung to a tip end of the boom 4 along an up and down direction of the boom 4. A post member 8 erected by being connected via a swing fulcrum shaft 7 so as to be movable; a post-side fulcrum shaft 9 provided at a position closer to the upper end of the post member 8; Boom 4 than
A double-acting hydraulic cylinder (11) vertically arranged between a post member (8) and a tip of a boom (4) via a boom tip-side fulcrum shaft (10) provided at a position close to a base end, the fulcrum of the boom (4). The triangle formed by the shaft 3, the swivel support shaft 5a of the boom hoist cylinder 5, and the boom support shaft 5b of the boom hoist cylinder 5, the swing support shaft 7, the post-side support shaft 9, and the boom tip A double-acting hydraulic cylinder 11 that expands and contracts in conjunction with the expansion and contraction drive of the boom hoist cylinder 5 so that the triangle formed by the side fulcrum shaft 10 always maintains a similar triangle, and a support extending from one side of the work bucket 6. The work bucket 6 is interposed between the bracket 6a and the upper end of the post member 8, and
A lower part of the post member 8 and a bearing mechanism 12 that can horizontally rotate around the post member 8 at a position where the post member 8 wraps in the height direction. A pair of left and right side plate members 8a, 8a swingably attached to the tip of the boom 4 via the shaft 7, and are arranged at a sufficient interval to accommodate at least the cylinder 11a of the double-acting hydraulic cylinder 11. A pair of left and right side plate members 8a, 8
a, an upper connecting member 8b for firmly connecting the upper ends of the pair of left and right side plate members 8a, 8a, and a front connecting member 8c for firmly connecting the front ends of the pair of left and right side plate members 8a, 8a.
The bearing mechanism 12 has a structure having a space in which the rear end, which is the base end direction of the boom 4, is open. The upper connecting member 8b of the post member 8 is made to pass near the axis 7c.
The double-acting hydraulic cylinder 11 is disposed at a position such that the post-side fulcrum shaft 9 passes through the vicinity of the turning center axis 12c. The telescopic axis 11c passes through the axis 9c of the post-side fulcrum shaft 9 and the axis 9c of the boom tip-side fulcrum shaft 9 so that a pair of left and right side plates 8a, A work bucket mounting structure for an aerial work vehicle, wherein the work bucket mounting structure is arranged so as to extend in a vertical direction so as to straddle between 8a and the inside of (the both side plates of) the end of the boom 4.