JPH0515188Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a traveling side frame that constitutes a traveling frame of a traveling device of a hydraulic excavator.

[Prior Art] As shown in FIG. 7, a traveling device for a hydraulic excavator has a traveling frame composed of two traveling side frames 1 and one traveling cross frame 2. The running side frame 1 and the running cross frame 2 are sometimes integrated by welding, but generally, during transportation etc.
They are fastened together by bolts 30 so that they can be disassembled or the overall width can be changed. Parts that make up the crawler, such as the idler tumbler 3 and the drive tumbler 4, are attached to the traveling side frame 1, and the swing circle 6 that supports the upper revolving body on which the driver's seat, engine, bucket, arm, boom, etc. is mounted is the traveling cross frame. It is installed on 2.

Then, by bolting the running side frame 1
The conventional running frame 1 that removably fastens the running cross frame 2 to the running cross frame 2 has a cross section of 5th
It is configured as shown in the figure. That is, the main member 7 of the running side frame has a mountain-shaped cross section at the top to prevent dirt from accumulating, and a fastening seat plate 8 having bolt holes is fixed horizontally on this main member. In order to do this, a part of the peak of the chevron of the main member 7 is cut out, one end of the seat plate 8 is welded to this notch, and the other end of the seat plate 8 is welded to the inner upright part of the main member 7. It is welded onto the leg member 10 which has been made horizontally. Note that a plurality of partition walls 9 are arranged at intervals inside the main member, and each of the partition walls 9 is welded to the main member 7 to form the main member 7.
is reinforced.

[Problems to be Solved by the Invention] The conventional technology as described above has a problem in that it requires a considerable amount of effort to manufacture the traveling side frame. In other words, in the prior art, the three members, the seat plate 8, the main member 7, and the leg members 10, must be precisely arranged;
After temporarily welding and assembling the leg member 10 and making modifications as necessary, final welding had to be carried out.

Furthermore, since the length L' of the weld line between the seat plate 8 and the main member 7 was short, there was a problem in ensuring the mechanical strength of the welded portion.

The present invention improves the problems of the prior art as described above, and provides a hydraulic excavator that allows the welding work between the main member and the seat plate to be performed simply and easily, and that also improves the mechanical strength of the welded part. The object of the present invention is to provide a traveling side frame for a traveling device for use in vehicles.

[Means for Solving the Problems] In order to achieve the above objects, the present invention comprises a traveling side frame of a traveling device for a hydraulic excavator which is fastened to a traveling cross frame by bolts. The main parts,
An outwardly located portion consisting of a slope portion that descends toward the outside and an outer upright portion that continues to the lower end of the slope portion, a horizontal portion that extends horizontally from the top of the slope portion, and a portion that continues to the end of the horizontal portion. It has a trapezoidal cross section consisting of an inner upright part and an inner part, and a plurality of partition walls are welded and fixed at intervals inside the main member, and the slope part between the partition walls is A notch is formed in which a part of the horizontal portion from the top to the inner upright portion is opened, and a seat plate having a wall thickness thicker than the main member and having a plurality of bolt holes is horizontally fitted into the notch. The seat plate, the main member, and the partition wall are welded and fixed together.

[Function] As described above, the traveling side frame of the present invention has the following features.
The main member has a deformed trapezoid in cross section, consisting of an outer part with a sloped part and an inner part with a horizontal top, and a seat plate is welded and fixed on the horizontal part located inside. Therefore, the conventionally required leg members are no longer necessary, and the welding work between the main member and the seat plate can be performed simply and easily.
In addition, the length of the weld line between the main member and the seat plate is longer than before, and the seat plate is welded and fixed not only to the main member but also to the partition wall, so that mechanical strength can be significantly improved.

Although there is no slope at the top of the inner part of the main component, the slope for preventing the accumulation of earth and sand actually functions in the outer part, and the inner part mostly plays its role. There is no problem since it has not been fulfilled.

[Example] An example of implementing the present invention will be described below with reference to FIGS. 1 to 4.

Fig. 1 is a cross-sectional view of the main components including the seat plate corresponding to Fig. 5 of the conventional example, Fig. 2 is an enlarged view of section A in Fig. 1, and Fig. 3 is a plan view of one running side frame. , FIG. 4 is a side view of the same.

As shown in FIGS. 3 and 4, the running side frame 11 of the present invention is provided with a notch 21 for accommodating an idler tumbler at one end of the main member 17, and a member 22 for attaching a drive tumbler at the other end. is fixed by welding. Inside the main member 17, a plurality of partition walls 19 are arranged at intervals along the longitudinal direction, and each partition wall 19 and the main member 1
7 are fixed by welding.

The main member 17 includes, as shown enlarged in FIG. 1, an outer portion consisting of a slope portion 24 that descends toward the outside and an outer upright portion 24' that continues to the lower end of the slope portion; It has a deformed trapezoidal cross section consisting of a horizontal part 25 extending horizontally from the top of the slope part 24 and an inner upright part 25' continuous to the end of the horizontal part 25. Then, a cutout part 26 is formed by opening a part of the horizontal part 25 from the top of the slope part 24 between the partition walls 19 and 19 to the inner upright part 25' of the main member 17 having the shape described above. (See also FIG. 3), a seat plate 18 whose wall thickness is thicker than the main member 17 is horizontally fitted into the notch 26, and the seat plate 18 and the main member 1
7 and the partition wall 19 are welded and fixed together. That is, the seat plate 18 has its outward facing edge welded to the slope portion 24 of the main member, its longitudinal side edges welded to the horizontal portion 25 of the main member and the partition wall 19, and the seating surface of the inward facing portion. is the inner upright part 25' of the main member.
welded on top. The seat plate 18 has a plurality of bolt holes 3 for bolt connection to the traveling cross frame.
Of course, it has 0'.

Since the traveling side frame of the present invention is constructed as described above, the seat plate can be welded and fixed horizontally to the main member without the need for leg members, so its manufacture is extremely simple and easy. Moreover, the length of the weld line between the seat plate 18 and the main member 17 (the length indicated by the symbol L in FIG. 1) is longer than the conventional weld line length L', and the seat plate 18 is the main member. Since it is welded not only to the partition wall 17 but also to the partition wall 19, the mechanical strength of the welded portion of the seat plate can be significantly increased.

[Effects of the invention] As described above, according to the invention, it is possible to simply and easily manufacture the traveling side frame of the traveling device for a hydraulic excavator, which has a traveling cross frame and a seat plate for bolt fastening. This has the effect of significantly improving the welding strength between the main member of the traveling side frame and the seat plate.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the traveling side frame of the traveling device for a hydraulic excavator of the present invention, FIG. 1 is a sectional view of the main members including the seat plate, and FIG. 2 is the same as that shown in FIG. 3 is a partially cutaway plan view of the entire running side frame, and FIG. 4 is a side view of the same. FIG. 5 is a sectional view of a conventional traveling side frame, FIG. 6 is an enlarged view of portion B in FIG. 5, and FIG. 7 is a plan view of the traveling device. 11... Traveling side frame, 12... Traveling cross frame, 17... Main member, 18... Seat plate,
19... Partition wall, 24... Slope portion, 25... Horizontal portion, 26... Notch portion.

Claims (1)

[Scope of utility model registration request] A traveling side frame of a traveling device for a hydraulic excavator, which is fastened to a traveling cross frame by bolts, characterized in that the main member constituting the traveling side frame has a trapezoidal cross section consisting of an outer portion consisting of a sloping portion descending outwardly and an outer upright portion continuing from the lower end of the sloping portion, and an inner portion consisting of a horizontal portion extending horizontally from the top of the sloping portion and an inner upright portion continuing from the end of the horizontal portion, and a plurality of partitions are welded and fixed at intervals inside the main member, a cutout portion is formed in which a portion of the horizontal portion extends from the top of the sloping portion between the partitions to the inner upright portion, and a seat plate which is thicker than the main member and has a plurality of bolt holes is horizontally fitted into the cutout portion, and the seat plate, the main member, and the partitions are welded and fixed together.