KR840001004B1 - Frame structure for construction vehicles - Google Patents

Abstract

The frame is for a construction vehicle having a lower frame(5) and a pair of track frames(2L,2R) connected to the lower frame. A pair of elongated box-shaped beams constitute a part of the lower frame and extend horizontally crosswise of the vehicle. Brackets(4,15,25) create a pair of freestanding plates(15a,15b,25a,25b) secured to an upper surface of each track frame, extending vertically upwardly and disposed parallel to the beams(6,14), to closely receive each of the opposite end portions of each beam. A pin(20) forms a connection between each and portion of the beam and each pair of plates of the bracket to connect the lower frame to the track frames.

Description

Frame structure for building vehicle

1 is a perspective view of a frame structure of a conventional tracked vehicle for civil construction.

FIG. 2 is a sectional view of principal parts of a vehicle width adjusting device having a frame structure shown in FIG.

FIG. 3 is a bending moment diagram applied to the frame structure shown in FIG. 1 during operation of the lower frame and a pair of interconnected track frames.

4 is a plan view of a frame structure, which is an embodiment of the invention.

5 is an enlarged side view of the main portion of the V-V line of the frame structure in FIG.

6 is a plan view, including a partial cross section, of the main portion shown in FIG.

7 is an enlarged side view of a V-V line main portion of a frame structure showing another embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure for building vehicles, and more particularly, to a frame structure of a vehicle for civil engineering and construction, in which an apparatus for efficiently adjusting vehicle width is required.

Vehicles used in construction work, with excavators having the same pair of caterpillars, are called "trackless vehicles", which are placed on both sides of the body, with buckles and other tools on top. . To prevent overturning of the vehicle body during operation, adjust the distance between two tracks of the caterpillar vehicle (hereinafter referred to as the "body width") to increase the body width when the vehicle is in operation and transport it to a destination far away from the vehicle. When it is necessary to do so, it should be possible to reduce the width of the body to meet the transport regulations in accordance with government regulations.

For this purpose, many frame structures with body width adjusting devices have been proposed.

Therefore, prior to explaining the embodiment of the frame structure according to the present invention will be described an example of a conventional frame structure as follows.

1 is a perspective view of a frame structure of a crawler vehicle disclosed in Japanese Utility Model Application Laid-Open No. 77-156035, and FIG. 2 is a sectional view of main parts of a vehicle width adjusting device of the vehicle shown in FIG. The endless tracks 1L and 1R are wound on the track frames 2L and 2R via a drive wheel 10 and a driven wheel 11, respectively. One pair of elongated empty box-shaped support angles (3) is welded and fixed at a position spaced back and forth at the center of the left track frame (2L), and the other pair of elongated empty box-shaped support angles (4) Is fixed to the position spaced apart from the front and rear at the center of the right track frame 2R.

The lower frame 5 comprises a pair of elongated bin-shaped members 6 which are arranged before and after and connected to each other by the connecting members 7, the dimensions of which are the support angles 3. ), (4) is interpolated in it and can be preserved in a contiguous state.

At one end of the support angles 3 and 4, first, second, third, bolt receiving holes 8a, 8b, and 8c arranged in a triangle are formed. On the other hand, the first, second, third, fourth, and fifth bolt receiving holes 9a, 9b, 9c, 9d, and 9e are formed at opposite ends of the long box-shaped member 6. The relative positions of the supporting angles 3, 4 and the bolt receiving holes of the elongate box-shaped member 6 are as shown in FIG.

Strictly speaking, if the support angles (3) and (4) are interpolated into the long box-shaped member (6) so that the tip of each support angle is separated from the stopper 12 by a distance from the stopper 12, the first, second and third bolt receiving holes 8a, 8b and 8c coincide with the first, second and fourth bolt receiving holes 9a, 9b and 9d, respectively, and the support angles 3 and 4 When the tip of each end is inserted into the long box-shaped member 6 so as to contact the stopper 12, the first, second, and third bolt receiving holes 8a, 8b, and 8c are respectively divided into second, The third and fifth bolt receiving holes 9b, 9c, and 9e coincide with each other.

The bolt 13 is accommodated in the first, second, and third bolt receiving holes 8a, 8b, and 8c respectively corresponding to three of the bolt receiving holes 9a to 9e, and has a long box shape. Is attached to the support angles (3) and (4).

Thus, the left and right support angles (3) and (4) are connected to the long box member (6) in one of two positions, in which the support angles (3) and (4) come into contact with the stopper (12). In the other position, the support angles 3, 4 are separated from the stopper 12.

Therefore, the space between the left and right infinite Quedo 1L, 1R, that is, the body width can be increased or decreased. However, the conventional frame structure has the following drawbacks.

(One). One end of the support angles 3 and 4 is connected to the left and right track frames 2L and 2R, and the other end thereof is inserted into the elongated box-shaped member 6 of the lower frame 5. In such a frame structure, it is necessary to precisely process the top, bottom, left and right outer circumferential surfaces of the support angles 3 and 4 and the inner circumferential surfaces of the upper, lower, left and right sides of the long box-shaped member 6.

This processing is not only time consuming but also expensive. In particular, processing of the inner circumferential surface of the long box-shaped member 6 is not only tedious and time consuming, but also more difficult when trying to increase the processing precision.

(2). Since the support angles 3 and 4 are interpolated at the opposite ends of the elongate box-shaped member 6, the opposite ends of the elongate box-shaped member 6 must be open. This structure has low strength against torsional loads. Therefore, it is necessary to increase the cross-sectional area of the elongated box-shaped member 6 or to increase the plate thickness of the hollow cavity to increase the strength.

In addition, the long box-shaped member and the support angle are partially overlapped, thereby increasing the weight. Therefore, the weight of the overlapping material is increased due to the increase in weight, which increases the strength, and the weight of the frame structure is greatly increased, thereby increasing the unit cost.

(3). 3 shows a bending moment diagram applied to the frame structure during operation of the track frames 2L and 2R interconnected with the lower frame 5. Assuming that the load F is evenly divided into F / 2 and F / 2 supported by the left and right track frames 2L and 2R, respectively, the bending moment is maximized at the center of the track frame as shown in the drawing. Minimum at opposite ends.

In the frame structure shown in FIG. 1 and FIG. 2, since the elongate box-shaped member 6 is connected to the support angles 3 and 4 by the bolt 13 near the center of the frame with the largest bending moment, the connection port It is necessary to increase the strength of.

(4). As mentioned in paragraph 1, it is difficult to increase the finishing precision of the long box-shaped member 6, so that a gap is formed between the long box-shaped member 6 and the sliding portions of the support angles 3 and 4. You need to make it big. At this time, they are fastened by the bolts 13 to each other to prevent relative movement.

However, the bolt 13 is subjected to the load due to the weight of the vehicle body, the reaction force generated during operation and the impact applied during operation, the transmission force, bending force, tensile force and other action force acts on the bolt (13). As a result, the bolt 13 is loosened or ruptured so that relative movement occurs between the long box-shaped member 6 and the support angles 3 and 4 during operation or operation, so that the performance of the vehicle is safe and comfortable riding. There is a risk of disturbing your mood.

(5). As mentioned in paragraph 4, a gap must be formed between the long box-shaped member 6 and the sliding portions of the support angles 3 and 4, which are fastened by bolts 13 to provide relative movement. It is preventing. In this case, since the relative movement by the horizontal load must be absorbed by the friction between the long box-shaped member 6 and the support angles 3 and 4, the tightening torque of the bolt is greatly increased by using many bolts. You have to.

Therefore, a large and heavy wrench or other tools must be fastened, but the wrench is difficult to handle as large and heavy. In addition, the place to be fastened is often in a difficult position to handle, which increases the time required to adjust the width of the vehicle, which is about 5 hours in the case of a caterpillar with a bucket capacity of 2㎥. .

Accordingly, the present invention has been developed to eliminate the above disadvantages. Accordingly, an object of the present invention is to provide a frame structure for a building vehicle that is simple in structure, inexpensive, and which can easily adjust the vehicle width.

Next, an embodiment of the present invention will be described with reference to FIGS. 4 to 6.

In FIGS. 4 and 5, parts similar to those of FIGS. 1 and 2 are denoted by the same reference characters.

As shown in the figure, the lower frame 5 includes a pair of long box-shaped beams 14 transversely intersecting itself with the beams 14 of the lower frame 5 on the left and right track frame 2L. ), A bracket ket device 15 for connecting to a position spaced back and forth from the center of (2R) is perpendicular to the longitudinal direction of each track frame on the upper surface of the left and right track frames (2L) and (2R). The welding is fixed. Opposing both ends of each of the beams 14 are closed to form a closed box structure that is strong against a torsional load.

The individual bracket device 15 consists of two plates 15a, 15b extending vertically upwards, the two plates 15a, 15b having the beam 14 without any gaps. It is installed parallel to the beam 14 while maintaining a gap so that it can be interpolated between the two plates. In this arrangement state, only the left and right outer surfaces of the beam 14 and the left and right inner surfaces of the plates 15a and 15b need to be processed, so that not only the processing cost is reduced but also the accuracy of the finishing is improved.

Bosses (14a) are formed at both ends of the beams (14). On one side of the bosses (14a), two pin receiving holes (17a) arranged horizontally apart by a distance (l) from each other, (17b).

The plate 15a, 15b of the bracket apparatus 15 has three pin accommodation holes 18a, 18b, and 18c arranged horizontally, respectively. The bush 19 is formed to be firmly fixed to the individual pin receiving holes 17a, 17b, 18a, 18b, and 18c. In the figures (4) to (6), the pin receiving holes 17a, 17b of the beam 14 are the plate 15a of each bracket 15 in the left and right track frames 2L, 2R, The pin receiving holes 18a and 18b of the 15b coincide with each other, and a pin 20 having a strength greater than that of the bolt 13 is installed and fixed as the bolt 21 and the nut 22. When you give, the tracked vehicle is put into operation as rain.

Each pin receiving hole 15 can be easily formed by finishing using a high precision horizontal drilling machine. Alternatively, the plates 15a, 15b of each bracket device 15 may be machined in advance and then fixed to the track frames 2L, 2R by welding. As shown in the diagram of FIG. 3, the lower frame 5 is connected to the positions of the left and right track frames 2L and 2R at which the bending moment is minimum. Therefore, according to the present invention, it is possible to design a light weight frame structure without reducing the strength.

Stoppers 23 and 24 are provided at each end of the beam 14. As shown in FIGS. 4 to 6, when the caterpillar vehicle is to be transformed into a transport state with a narrow body width in an operating state with a wide body width, the bolt 20 and the nut 22 are loosened and the pin 20 is beamed ( 14) and the pin receiving holes 17a, 17b, 18a, and 18b coincident between the bracket device 15, and then the left and right track frames 2L and 2R are crosswise to the vehicle body. Inwards by a distance l to bring the bracket device 15 to a position adjacent to the stopper 24, as shown by the dashed-dotted line in FIG.

When the left and right track frames 2L and 2R are respectively positioned at the dashed-dotted positions in Fig. 5, the pin receiving holes 17a and 17b of the beam 14 are pinned to the bracket plates 15a and 15b. The pins 20 are fitted into the matching storage holes, and the pins 20 and 18c are fixed to the storage holes 18b and 18c.

On the contrary, when the caterpillar vehicle is to be converted from the transport state to the operating state, the above process may be reversed. In this case, when the bracket device 15 is adjacent to the stopper 23, the pin receiving holes 17a and 17b of the beam 14 are bracketed device 15 as shown in the drawings (4) to (6). To the pin housing holes 18a and 18b, respectively.

7 shows another embodiment, in which parts like the figures (4) to (6) are denoted by the same reference characters. At each end of the beam 14 in the lower frame 5, as in the embodiments of FIGS. 4 to 6, two pin receiving holes 17a and 17b arranged horizontally apart by a distance l from each other (17b). ) Is formed.

On the other hand, the bracket device 25 is attached to the upper surface of the left and right track frame (2L), (2R) is perpendicular to the longitudinal direction of the track frame. Like the bracket device 15 shown in the embodiment of figures 4 to 6, the bracket device 25 is shown with two plates 25a and 25b (only plate 25b in FIG. 7), respectively. It is composed of

Two pin receiving holes 26a and 26b are arranged horizontally apart by a distance from the bracket plates 25a and 25b. Two support plates 27 having a thickness slightly smaller than the gap between the beam 14 of the lower frame 5 and the respective left and right track frames 2L and 2R are defined by the left and right track frames 2L and 2R. The two bracket plates 25a and 25b on the top surface are welded to each other at appropriate intervals.

In FIG. 7 of the caterpillar vehicle, an operation state in which the vehicle body width is increased in a solid line is shown. In this case, the pin receiving holes 17a and 17b of the beam 14 are the pin receiving holes 26a of the bracket device 25. ) And (26b) respectively. As in the embodiment of Figs. 4 to 6, in this embodiment, the pin 20 is fitted into the receiving hole to which the pins 20 coincide with each other to connect the lower frame 5 to the left and right track frames 2L and 2R. Giving.

In order to convert the caterpillar vehicle shown in FIG. 7 into a transport state having a reduced body width, the pin 20 is pulled out from the connector, and the left and right track frames 2L and 2R are double pointed in FIG. As indicated, it slides in the direction of the criss-cross with respect to the vehicle body by a distance l.

In this position, each bracket device 25 is adjacent to the stopper 24, and the pin receiving hole 17a is coincident with the pin receiving hole 26b of each bracket device 25. As shown in FIG. At this time, the pin 20 is fitted in the receiving hole with the coincidence term, and firmly connects the lower frame 5 and the left and right track frames 2L and 2R.

In the embodiment shown in FIG. 7 due to the arrangement described above, two vertical loads F and moments M are applied to the connection port between the lower frame 5 and the left and right track frames 2L, 2R. Withstands by the pin 20. However, when the caterpillar vehicle is in a transport state (advanced chain position), the vertical load F is tolerated by only one pin 20 and the moment M is the lower surface of the two support plates 27 and the beam 14. Withstands the contact surface between.

In this embodiment, only two receiving holes are formed in the bracket device 25 in the left and right track frames 2L and 2R. Therefore, since the size of the bracket device 25 can be reduced, the unit cost can be reduced and the vehicle body width conversion can be easily performed.

The frame structure according to the present invention has the following advantages.

(One). Both ends of the beams in the lower frame have a high strength against torsional loads since they are hermetically sealed to form a complete box structure. The lower frame, on the other hand, can be designed to have a frame structure that is light in weight and does not reduce strength because the bending moment is connected to the track frame at least in position.

(2). The number of parts that need to be processed is reduced, and the parts that need to be processed can be easily processed, thereby making the frame structure easy to manufacture.

(3). It can be easily and precisely trimmed against the beams of the lower frame and the sliding parts on the brackets of the left and right track frames. Thus, each beam can be pinned to individual bracket devices to at least reduce the gap therebetween, thereby reducing the relative movement between the lower frame and the left and right track frames. As a result, the vehicle is significantly improved in terms of strength, performance, stability and ride quality.

(4). Since the beams are arranged to be connected to the bracket device so that the gap between the beam and the bracket device is minimized by the pins, the vehicle body width adjustment can be performed more effectively in a shorter time. The time required for effectively adjusting the vehicle body width is about 2 hours in the case of a caterpillar vehicle having a bucket size of 2 m 3.

(5). The pins used to connect the lower frame to the left and right track frames are of high strength and have a central structure.

(6). In general, the frame structure according to the present invention is not only simple, robust and low in production cost, but also can easily adjust the vehicle width more efficiently.

Claims (1)

A lower frame 5 and a pair of track frames 2L and 2R connected to the lower frame, wherein the lower frame has a pair of long box-shaped beams extending almost horizontally in a crisscross direction; (6) and (14) are bracket devices (4), (15), and (25) fixed to the orbital frame to support the opposite ends of the beams (6) and (14). In the frame structure for a building vehicle, each of which includes the bracket device (15), (25) is a bracket plate (15a), (15b), (25a) in parallel to accommodate each end of the beam described above. , 25b is fixed to the upper surfaces of the track frames 2L, 2R so as to extend vertically upward, and the pin device 20 is provided to fix each end of the beam to the bracket plate. And the lower frame 5 is connected to the track frames 2L and 2R. Article.

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