JPH0558255A - Spanner device for working vehicle - Google Patents

Abstract

PURPOSE:To secure the stability in working by increasing the strength of a frame when the interval between the left and right traveling bodies is spread, reducing the total width of the machine body of a working vehicle as small as possible. CONSTITUTION:Left and right opened port edge parts 20 and 20 are aslantly installed so that the total length M2 on the upper part side of a supporting frame 18 which is fixedly installed on a lower frame becomes larger than the total length M1 on the lower part side. The left and right side part frames 19 on which a traveling body 12 is installed is inserted from the opened port edge part 20, and slided. On the traveling body 12 side of the side part frame 19, a stopper plate 21 is aslantly installed in correspondence with the aslant surface of the opened port edge part 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle such as a crane and a power shovel, and more particularly to a spanner device for expanding and contracting a space between left and right traveling bodies in order to improve stability of the machine body.

[0002]

2. Description of the Related Art FIG. 7 shows a lower frame of a conventional work vehicle.
Is provided and the turning device 2 is fixed at the center thereof, side frames 3 and 3 are provided on the left and right of the support frames 1 and 1, and traveling bodies 4 and 4 such as crawlers are attached. The base of the spanner cylinder 5 is attached to one of the left and right side frames 3, and the tip of the piston rod 6 is supported by the other side frame 3 to form a spanner device.

FIG. 8 shows a vertical cross-section of the support frame 1, in which the left and right side frames 3, 3 are partly fitted. In the figure, the piston rod 6 of the spanner cylinder 5 contracts, and the distance between the traveling bodies 4 and 4 is minimized, and the total width of the machine body at this time is L ₁ . In this work vehicle, the overall width L ₁ of the machine body must be made small in order to improve workability in a narrow space, and the lateral length M of the support frame 1 is also made small.

When performing work such as excavation, FIG.
If the piston rod 6 of the spanner cylinder 5 is extended as shown in FIG. 5, the left and right side frames 3 and 3 are pulled out to the left and right of the support frame 1 and the distance between the left and right traveling bodies 4 and 4 is widened. It will be the maximum. At this time, the entire width of the machine body is L _2, and the length in which the side frame 3 is fitted inside the support frame 1 is O ₁ .

[0005]

In the conventional spanner device for a work vehicle, the lateral length M of the support frame 1 is made small in order to improve workability in a narrow space. Therefore, the fitting length O ₁ of the side frame 3 when the distance between the running bodies 4 and 4 is maximized is reduced, and the supporting strength for the side frames 3 and 3 is reduced.

Therefore, a technique to be solved in order to reduce the overall width of the machine body of the work vehicle as much as possible, increase the strength of the frame when the distance between the traveling bodies is expanded, and ensure stability during work. Therefore, the present invention aims to solve this problem.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object. A support frame is fixedly provided in the left-right direction of a lower frame, and the entire length of the upper side of the support frame is the lower side. The left and right opening ends are obliquely provided so as to be longer than the entire length of the supporting frame, and the left and right side frames to which the traveling body is attached are fitted from the left and right opening ends of the supporting frame, and further, the left and right side parts are A stopper plate is obliquely provided on the side of the traveling body of the frame corresponding to the slope of the opening end, and left and right side frames are slid with respect to the support frame so that the spacing between the traveling bodies can be expanded and contracted. And a spanner device for a work vehicle.

[0008]

In the spanner device of the present invention, the left and right open ends of the support frame are obliquely provided, and the total length of the upper side of the support frame is larger than the total length of the lower side. Further, since the stopper plate is obliquely provided on the side frame corresponding to the slope of the opening end, when the left and right side frames are pulled into the inside of the supporting frame, the opening end of the supporting frame is The stopper plate of the side frame is brought into close contact with the slope, and the left and right traveling bodies are supported in a reduced space.

On the other hand, the fitting length of the side frame when the left and right side frames are pulled out from the support frame is such that the opening end of the support frame is obliquely provided, so that the fitting length of the upper side of the support frame is Is larger than the fitting length on the lower side. Therefore, the contact area of the fitting portion between the support frame and the side frame is increased, and the support strength is improved when the distance between the left and right running bodies is expanded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a side view of an ultra-compact excavation work vehicle 11. Traveling bodies 12, 12 such as crawlers are attached to the left and right of a lower frame, which will be described later, and an upper frame (see FIG. (Not shown) is rotatably mounted. Then, the frame cover 14 is attached to the upper frame to cover the engine part such as the engine, and the hydraulic excavator 15 is provided in the front part of the upper frame. Furthermore, the frame cover 1
Various operation levers 16 are provided on the upper surface of the front portion of the No. 4 and a seat 17 for the operator is fixed on the upper surface of the rear portion of the frame cover 14.

2 and 3 show a lower frame of the work vehicle 11, which includes support frames 18 in the left-right direction.
18 is provided, and the swivel device 13 is fixedly installed at the center of the
Side frames 19, 1 on the left and right sides of the support frames 18, 18
9 is provided and the traveling bodies 12, 12 are attached. The support frame 18 is provided with left and right open end portions 20, 20 obliquely so that the total length M ₂ on the upper side thereof is larger than the total length M ₁ on the lower side, and a part of the left and right side frames 19, 19 is formed. Is inserted from the open ends 20, 20. Then, stopper plates 21 are obliquely provided on the side of the traveling body 12 of the left and right side frames 19 corresponding to the slopes of the opening ends 20, and the side frames 19 are drawn into the support frame 18 as shown in the drawing. The side frame 19 on the slope of the opening end 20.
The stopper plate 21 is formed so as to be in close contact. The total width of the machine body at this time is L ₁ .

Here, as shown in FIG. 2, a bracket 22 is provided on the rear side of the support frame 18, and a spanner cylinder 23 is attached to the bracket 22 in the front-rear direction. One end of each of the links 25, 25 is connected to the tip of the piston rod 24 of the spanner cylinder 23,
The other end of 25 is connected to a substantially central position in the front-rear direction of the side frames 19, 19 via brackets 26, 26. Figure 4
Indicates an attachment site of the spanner cylinder 23, and long holes 27, 27 are opened in the front-rear direction of the bracket 22, and the upper and lower ends of the pin 28 fitted to the tip end portion of the piston rod 24 are formed by the long holes 27, 27. Play with. Therefore, when the piston rod 24 of the spanner cylinder 23 expands and contracts, the piston rod 24 is guided so as to accurately move in the front-rear direction, and the tip end portion of the piston rod 24 is prevented from swinging left and right. ..

Then, as shown in FIG. 5, when the piston rod 24 of the spanner cylinder 23 is extended, the pin 28 moves forward along the elongated hole 27, and the link 25 connected to the pin 28. , 25 are expanded, and the space between the left and right side frames 19, 19 is expanded, as indicated by the chain double-dashed line in the figure. Further, if the piston rod 24 of the spanner cylinder 23 is contracted, the distance between the left and right side frames 19, 19 is reduced by the action opposite to the above. At that time, since the spanner cylinder 23 is attached in the front-rear direction, the links 25, 25 expand or contract evenly in the left-right direction, and the spacing between the side frames 19, 19 changes symmetrically from the center of the machine body. Further, in the conventional type, since the spanner cylinder was attached in the left-right direction, it was difficult to control the dimensions during expansion and contraction. However, in the present invention, the side frame 19,
The interval of 19 can be set arbitrarily, and fixing during expansion and contraction is easy.

In FIG. 6, the spanner cylinder 23 is actuated to the left.
The state in which the distance between the right running bodies 12, 12 is expanded,
The left and right side frames 19, 19 of the support frame 18
While sliding inside, from the left and right open ends 20, 20
It is pulled out and the entire width of the aircraft is L ₂It has spread. As mentioned above
As described above, the total length M of the upper side of the support frame 18 is₂Is the bottom
Side total length M₁Within the support frame 18 as it is larger
The length in which the side frame 19 is fitted into the portion is the lower side
Insertion length O₁Fitting length O on the upper side₂Is bigger
It Therefore, as compared with the conventional type, the support frame 18 and the side portions are
The contact area of the fitting part with the frame 19 increases, and
Support strength when the space between the rows 12 is expanded
The degree improves. Especially, the side frame 19 is pulled out.
When a large load is applied to the upper side of the support frame 18,
Therefore, the fitting length O on the upper side is ₂It is a big thing
It is extremely effective in improving the strength of the ram.

Further, when work is performed with the side frames 19 and 19 pulled out, even if sediment is deposited on the slide portion, the stopper plate 21 is inclined, so that the sediment easily falls. Even when the side frames 19, 19 are pulled into the inside of the support frame 18, the earth and sand are naturally discharged. The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified version.

[0016]

As described in detail in the above-mentioned embodiment, the present invention has the left and right open end portions of the support frame obliquely provided so that the fitting length on the upper side of the support frame is large. The contact area of the fitting portion is increased as compared with the mold, and the supporting strength for the side frame is improved. Moreover, since the fitting length on the load direction side applied to the support frame is large, the strength of the frame is ensured even when the distance between the left and right running bodies is expanded to the maximum.

In this way, the overall width of the machine body can be made as small as possible to enable traveling in a narrow space, and at the time of work, the interval between the travel bodies can be expanded to perform stable work, thereby improving safety and work efficiency. It can remarkably contribute to the improvement of the property.

[Brief description of drawings]

FIG. 1 is a side view of a microminiature excavation work vehicle showing an embodiment of the present invention.

FIG. 2 is a plan view showing a lower frame of the work vehicle according to the present invention.

FIG. 3 is a B- of FIG. 2 showing a state in which the distance between the running bodies is reduced.
B sectional drawing.

FIG. 4 is a perspective view of a main part showing a mounting portion of a spanner cylinder.

FIG. 5 is a plan view for explaining the expansion and contraction operation of the spanner cylinder.

FIG. 6 is a B- of FIG. 2 showing a state where the distance between the traveling bodies is expanded.
B sectional drawing.

FIG. 7 is a plan view showing a lower frame of a conventional work vehicle.

FIG. 8 is an A- of FIG. 7 showing a state in which the distance between the running bodies is reduced.
A sectional view.

FIG. 9 is an A- of FIG. 7 showing a state where the distance between the traveling bodies is expanded.
A sectional view.

[Explanation of symbols]

11 Work Vehicle 12 Traveling Body 18 Support Frame 19 Side Frame 20 Open End 21 Stopper Plate M ₁ Overall Length of Lower Side of Support Frame M ₂ Overall Length of Upper Side of Support Frame O ₁ Lower Side Insertion Length of Side Frame O ₂ Side part Upper part fitting length

Claims (1)

[Claims] 1. A support frame is fixedly provided in the left-right direction of the lower frame, and left and right opening ends are obliquely provided so that the overall length of the upper side of the support frame is larger than the overall length of the lower side thereof, and the running body is also provided. The left and right side frames attached with are fitted from the left and right opening ends of the support frame, and further stopper plates are obliquely provided on the traveling body side of the left and right side frames corresponding to the slopes of the opening ends. At the same time, the spanner device for a working vehicle is characterized in that the left and right side frames are slid with respect to the support frame so that the distance between the traveling bodies can be expanded and contracted.