JP2009119972A - Lower traveling body for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lower traveling body for a construction machine capable of adjusting the width, while utilizing a crawler frame of a simple structure. <P>SOLUTION: This lower traveling body C1 for the construction machine has a center frame 10 for turnably supporting an upper turning body and right and left side frames 12 and 13 telescopically connected in the width direction of the center frame 10. The lower traveling body C1 is provided with guide parts 14 mounted on side frames 12 and 13 and formed with receiving structures 27 to receive projecting parts 11 projecting from the center frame 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lower traveling body for a construction machine, and more specifically, includes a center frame that supports an upper swing body so as to be capable of swinging, and left and right side frames that are connected to be able to expand and contract in the width direction of the center frame. The present invention relates to a lower traveling body for construction machinery.

  Conventionally, a construction machine having a spanner cylinder for widening the width of the lower traveling body is known (for example, see Patent Document 1).

  1 and 2 are schematic views of a construction machine described in Patent Document 1. The construction machine has a revolving body support frame 1 that supports an upper revolving body 4, and left and right sides of the revolving body support frame 1. A lower traveling body having crawler frames 2 and 3 connected so as to be freely extended is provided so that the amount of extension of the crawler frames 2 and 3 can be adjusted by expansion and contraction of the hydraulic cylinder.

The revolving unit support frame 1 includes a guide tube 6 that receives the insertion tube 5 protruding from the crawler frames 2 and 3 so that each of the crawler frames 2 and 3 can be widened by a predetermined widening length W.
JP 2001-106128 A

  However, since the lower traveling body described in Patent Document 1 requires the insertion cylinder 5 protruding from the crawler frames 2 and 3 in order to widen the structure, the structure of the crawler frames 2 and 3 that are large parts is complicated. This increases the manufacturing cost.

  Accordingly, the present invention has been made in view of the above points, and an object thereof is to provide a lower traveling body for a construction machine that can adjust the width while using a crawler frame having a simple structure. And

  A lower traveling body for a construction machine according to a first aspect of the present invention is a lower part for a construction machine having a center frame that rotatably supports the upper swing body and left and right side frames that are elastically connected in the width direction of the center frame. A traveling body comprising a guide portion that forms a receiving structure for receiving a convex portion protruding from the center frame on the side frame.

  Moreover, 2nd invention is the lower traveling body for construction machines which concerns on 1st invention, Comprising: The expansion-contraction adjustment part which adjusts expansion / contraction of the side frame is further provided.

  Further, the third invention is a lower traveling body for construction machinery according to the second invention, the expansion and contraction adjustment portion is a hydraulic cylinder, one end of the hydraulic cylinder is attached to the guide portion, The other end of the hydraulic cylinder is attached to the center frame.

  According to a fourth aspect of the present invention, there is provided the lower traveling body for a construction machine according to any one of the first to third aspects, further including an expansion / contraction limiting mechanism for limiting expansion / contraction of the side frame.

  The fifth invention is a lower traveling body for construction machinery according to any one of the first to fourth inventions, wherein the guide portion is detachably attached to the side frame.

  ADVANTAGE OF THE INVENTION According to this invention, the lower traveling body for construction machines which enables adjustment of the width | variety can be provided, utilizing the crawler frame of a simple structure.

  Embodiments of the present invention will be described below.

  3-5 is a figure for demonstrating the lower traveling body for construction machines which concerns on this invention, FIG. 3 is a top view of the lower traveling body for construction machines which concerns on this invention, FIG. 4 is the left side. FIG. 5 and FIG. 5 show exploded views, respectively.

  The lower traveling body C1 is a mechanism for moving the construction machine forward, backward, left and right, and includes a center frame 10, a left side frame 12, and a right side frame 13.

  The center frame 10 is a frame provided with a turning mechanism RM for pivotally supporting an upper turning body (not shown) at the center thereof. For example, as shown in FIG. 3 or FIG. The projections 11a and 11b projecting to the left (downward in the figure) and the projections 11c and 11d projecting to the right (upward in the figure) (projections 11a, 11b, 11c and 11d each mean that it is one of the convex parts 11. The same expression by the small letter a-d is used also about the below-mentioned member.

  The two convex portions 11c and 11d projecting to the left are respectively rectangular receiving structures 27c and 27d formed by the guide portions 14c and 14d arranged on the left side frame 12 (see the dotted line region in FIG. 6). 6 is a side view of the guide portions 14c and 14d.

  The guide portion 14 is a member that is fastened and fixed with bolts 16 to a plurality of bolt holes 15 formed on the side frames 12 and 13, and receives the convex portions 11c and 11d of the center frame 10 as shown in FIG. Receiving structures 27c, 27d are formed.

  In addition, although not shown in figure, the convex parts 11a and 11b of the center frame 10 are similarly received by the receiving structures 27a and 27b formed by the guide parts 14a and 14b on the right side frame 13.

  The left side frame 12 and the right side frame 13 are frames in which crawlers for moving the construction machine are arranged on the outer periphery thereof. For example, as shown in FIG. 4, two guide portions 14c and 14d are provided on the upper portion thereof. It is attached with bolts 16c and 16d to form rectangular receiving structures 27c and 27d so that the convex portions 11c and 11d of the center frame 10 can be received.

  The positions of the left side frame 12 and the right side frame 13 are adjusted in the width direction by spanner cylinders 18a to 18d disposed between the left side frame 12 and the right side frame 13 and the center frame 10, respectively. Is done.

  FIG. 3 shows a state in which the left side frame 12 is moved most greatly inward (upward in the drawing), and a state in which the right side frame 13 is moved most greatly outward (upward in the drawing).

  The spanner cylinders 18a to 18d are an example of an expansion / contraction adjustment unit, and for example, one end thereof is attached to the brackets 21a to 21d in the guide portions 14a to 14d via the side frame side cylinder pins 17a to 17d, The other end is attached to the bracket 22 on the center frame 10 via the center frame side cylinder pins 19a to 19d.

  Thus, the lower traveling body C1 eliminates the need to provide brackets on the side frames 12 and 13 by attaching one end of the spanner cylinders 18a to 18d to the guide portions 14a to 14d. Simplify the structure.

  The spanner cylinders 18a to 18d are operated, for example, by an operation lever in the driver's seat, and preferably both spanner cylinders 18a and 18b on the right side of the lower traveling body C1 are controlled in synchronization. Both spanner cylinders 18c and 18d on the left side of C1 are synchronously controlled.

  The side frames 12 and 13 are maintained perpendicular to the protruding direction of the convex portion 11 in the center frame 10, and an inclination angle is formed between the side frames 12 and 13 and the convex portion 11 to cause both members to interfere excessively. This is because the side frames 12 and 13 can be smoothly moved in the width direction while preventing the occurrence of such a situation.

  In addition, the expansion / contraction adjustment part may be comprised with the rack and the pinion other than the hydraulic cylinder like the spanner cylinder 18. In that case, a toothed rack may be attached along the convex portion 11 of the center frame 10.

  The lower traveling body C1 includes an expansion / contraction limiting mechanism that limits the expansion / contraction width in the width direction of the side frames 12 and 13, and the expansion / contraction limitation mechanism is formed in each of the convex portions 11a to 11d of the center frame 10, for example. The elongated holes 23a to 23d are formed, and the expansion / contraction width is determined by the width D (see FIG. 5) of the elongated holes 23a to 23d.

  The expansion / contraction width determined by the width D of the long holes 23a to 23d is set so that the width of the lower traveling body C1 is narrower than the maximum width allowed by the transportation means (for example, a trailer or a ship) of the construction machine, for example. In addition, the width of the lower traveling body is set so as not to exceed the front and rear lengths of the lower traveling body.

  The lower traveling body C1 receives the positioning pins 24a to 24d penetrating the guide portions 14a to 14d in the elongated holes 23a to 23d, and allows the positioning pins 24a to 24d to move within the width D.

  The lower traveling body C1 moves the side frames 12, 13 in the width direction using the spanner cylinder 18, and when the positioning pins 24a to 24d come to desired positions in the width D, the side frame 12, The movement of 13 in the width direction is stopped, and the positions of the side frames 12, 13 in the width direction are fixed.

  Further, the lower traveling body C1 has a slide portion 25 arranged around the convex portion 11 in the center frame 10, and friction between the convex portion 11 and the side frames 12, 13 or between the convex portion 11 and the guide portion 14. The friction with the inner surface is lowered to facilitate the sliding of the convex portion 11, and the side frames 12, 13 can be moved smoothly in the width direction.

  The slide part 25 is a member for facilitating sliding of mechanical parts that come into contact with each other. For example, there is a plate whose surface is polished. In addition, the surface of the convex part 11, and the inner surface of the guide part 14 which contacts the convex part 11, and the upper surface of the side frames 12 and 13 may be directly grind | polished.

  Next, the details of the expansion / contraction limiting mechanism will be described with reference to FIGS. 7 shows a sectional view taken along line VII-VII in FIG. 3, FIG. 8 shows a sectional view taken along line VIII-VIII in FIG. 3, and FIG. 9 shows a sectional view taken along line IX-IX in FIG.

  The lower traveling body C1 shown in FIGS. 7 to 9 shows a state in which the left side frame 12 is moved to the innermost side (right side in the figure) and the right side frame 13 is moved to the outermost side (right side in the figure). The auxiliary diagram surrounded by a dotted line in FIG. 7 shows a state in which the positional relationship between the long holes 23b and 23d and the positioning pins 24b and 24d is viewed from above.

  As shown in FIG. 7, the positioning pin 24b is located at the outermost position (the right side in the figure) of the long hole 23b. As shown in FIG. 8, the spanner cylinder 18b that extends is inserted through the side frame side cylinder pin 17b. Thus, the movement to move the guide portion 14b further outward (right side in the figure) is restricted.

  Further, as shown in FIG. 7, the positioning pin 24d is located at the innermost position (right side in the figure) of the long hole 23d, and as shown in FIG. 8, the contracting spanner cylinder 18d is a side frame side cylinder pin 17d. The movement of trying to draw the guide portion 14b closer to the inner side (right side in the figure) is limited.

  8 and 9, each of the side frame side cylinder pins 17a to 7d is attached to brackets 21a to 21d of the corresponding guide portions 14a to 14d, and the side frames 12, 13 are There is no need to provide a separate bracket for receiving the force from the spanner cylinders 18a-18d.

  Further, once the width of the lower traveling body C1 is determined, the upper surfaces of the side frames 12 and 13 are pressed by the lower surface of the convex portion 11 by the weight of the center frame 10 including the upper swing body installed on the lower traveling body C1. Therefore, the spanner cylinder 18 expanded and contracted to a predetermined length is prevented from unintentionally changing its width. In addition, the convex portion 11 and the guide portion 14 are tightened using the positioning pin 24. By fixing, the width may be more reliably prevented from unintentionally changing.

  As described above, since the lower traveling body C1 includes the convex portion 11 on the center frame 10, the side frames 12 and 13 are moved in the width direction quickly and surely while making the structures of the side frames 12 and 13 as simple as possible. The structure to be made can be provided.

  As a result, the lower traveling body C1 can improve the transportability by shrinking its width when transporting the construction machine by a trailer or a ship, and on the other hand, when the construction machine is used, the width of the lower traveling body C1 can be expanded to support the overturning fulcrum. The stability of the work can be improved by moving the machine away from the center of the construction machine.

  Moreover, since the lower traveling body C1 allows the convex portion 11 of the center frame 10 to be received by the guide portion 14 on the side frames 12 and 13, when the guide portion 14 is provided at the center or lower portion of the side frames 12 and 13, In comparison, the minimum ground clearance of the center frame 10 can be increased, and more stable work can be realized at a work site where the ground is uneven.

  Further, the lower traveling body C1 can further simplify the configuration of the side frames 12 and 13 by making the side frames 12 and 13 and the guide portion 14 separable. Since it can be configured with a small member, the machining can be facilitated and the machining accuracy can be improved.

  Further, the lower traveling body C1 can be provided with the expansion / contraction limiting mechanism, thereby preventing the spanner cylinder 18 from being excessively extended and causing the side frames 12 and 13 to be erroneously separated from the center frame 10.

  Further, the lower traveling body C1 includes the plurality of spanner cylinders 18 for one of the side frames 12 and 13, whereby the side frames 12 and 13 can be smoothly translated in the width direction.

  Next, an operation procedure for adjusting the width of the lower traveling body C1 will be described with reference to FIGS.

  First, the user operates the attachment on the upper swing body with an operation lever of an attachment (a combination of arms in a construction machine, for example, a boom, an arm, and a bucket) arranged in the driver's seat. Then, the bucket of the attachment is pressed against the ground so that one of the side frames 12 and 13 of the lower traveling body C1 is suspended from the ground.

  This is because the lower surface of the convex portion 11 in the center frame 10 reduces the force pressing the upper surfaces of the side frames 12 and 13.

  In addition, when the convex part 11 and the guide part 14 are clamped and fixed by the positioning pin 24, the user manually loosens the clamp and allows the convex part 11 and the guide part 14 to move relative to each other.

  In the following, the description will be continued assuming that the left side frame 12 is lifted from the ground, but the same description is applied to the right side frame 13 except that the left and right sides are opposite.

  Thereafter, the user operates the operation levers or operation buttons of the spanner cylinders 18c and 18d disposed in the driver's seat to simultaneously expand and contract the corresponding spanner cylinders 18c and 18d, thereby expanding and contracting the mechanism (elongate holes 23c and 23d). The left side frame 12 is moved in the width direction within the limit of the expansion / contraction width set by.

  When the left side frame 12 is moved to a desired position, the user operates the attachment operation lever again to land the left side frame 12 on the ground, and the convex portion 11c is caused by the weight of the center frame 10 including the upper swing body. , 11d is pressed against the upper surface of the left side frame 12, and as a result, the left side frame 12 is prevented from moving in the width direction thereafter.

  Next, another embodiment of the expansion / contraction limiting mechanism in the lower traveling body C1 will be described with reference to FIG.

  As shown in FIG. 10 (A), the lower traveling body C1 includes three round holes 30 instead of the long holes 23 in each of the convex portions 11, and the positioning pin 24 is one of the three round holes 30. You may make it insert in.

  Accordingly, the lower traveling body C1 requires the user to insert / remove the positioning pins 24 when moving the side frames 12, 13 in the width direction. However, after the movement in the width direction is completed, the positioning pins 24 are moved. Is inserted into one of the three round holes 30, the movement of the side frames 12, 13 in the width direction can be more reliably restricted.

  As shown in FIG. 10B, the lower traveling body C1 includes an E-shaped hole 31 instead of the long hole 23 in each of the convex portions 11, and is formed in the guide groove 32 formed in the guide portion 14. The positioning pin 24 may be slid along the E-shaped hole 31 so that the positioning pin 24 is positioned at any one of the three engagement positions 33.

  As a result, the lower traveling body C1 requires the user to slide the positioning pin 24 when moving the side frames 12 and 13, but after the movement in the width direction is finished, the positioning pin 24 has three positioning pins 24. If it is positioned at any of the engagement positions 33, the movement of the side frames 12, 13 in the width direction can be more reliably restricted.

  In addition, in the above-mentioned Example, although the lower traveling body C1 is each provided with the three round holes 30 or the three engagement positions 33, it is two or four or more round holes 30 or engagement positions. 33 may be provided.

  Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment, and various modifications and changes are within the scope of the gist of the present invention described in the claims. It can be changed.

  For example, in the above-described embodiment, the center frame 10 of the lower traveling body C1 includes two convex portions 11 on each of the left and right sides, but may include one convex portion 11 on each of the left and right sides. Two or more convex portions 11 may be provided.

  By making the convex part 11 on one side, the lower traveling body C1 can simplify the structure of the center frame 10, while on the other hand, by making the convex part 11 three on one side, It is possible to suppress the formation of an inclination angle between the convex portion 11 and the convex portion 11, and to make the side frames 12 and 13 parallel movement in the width direction more smoothly.

  In the above-described embodiment, the lower traveling body C1 includes two spanner cylinders 18 on each of the left and right sides. However, the lower traveling body C1 may include one spanner cylinder 18 on each side. The spanner cylinder 18 may be provided.

  As in the case of the convex part 11, the lower traveling body C1 can simplify the structure of the center frame 10 by using one spanner cylinder 18 on one side. By using one, the parallel movement of the side frames 12, 13 in the width direction can be made smoother.

  One end of the spanner cylinder 18 is attached to the brackets 21c and 21d on the guide portions 14c and 14d of the left side frame 12, and the other end is attached to the brackets 21a and 21b on the guide portions 14a and 14b of the right side frame 13. You may make it attach to. This is because the number of spanner cylinders 18 is reduced to simplify the structure of the lower traveling body C1.

It is a disassembled perspective view of the lower traveling body which can be expanded in the conventional construction machine. It is a rear view of the construction machine shown in FIG. It is a top view of the lower traveling body for construction machines according to the present invention. It is a left view of the lower traveling body for construction machines shown in FIG. It is an exploded view of the lower traveling body for construction machines shown in FIG. It is a side view of a guide part. It is sectional drawing along the VII-VII line in FIG. It is sectional drawing along the VIII-VIII line in FIG. It is sectional drawing along the IX-IX line in FIG. It is a figure which shows the other Example of the expansion-contraction restriction | limiting mechanism in a lower traveling body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Revolving body support frame 2, 3 Crawler frame 4 Upper revolving body 5 Insertion cylinder 6 Guide cylinder 10 Center frame 11 Convex part 12 Left side frame 13 Right side frame 14 Guide part 15 Bolt hole 16 Bolt 17 Side frame side cylinder pin 18 Span Ner cylinder 19 Center frame side cylinder pins 21, 22 Bracket 23 Long hole 24 Positioning pin 25 Slide part 27 Receiving structure 30 Round hole 31 E-shaped hole 32 Guide groove C1 Lower traveling body D Stretching width RM Turning mechanism W Widening length

Claims (5)

A lower traveling body for a construction machine having a center frame that pivotally supports the upper swing body and left and right side frames that are elastically connected in the width direction of the center frame,
On the side frame, provided with a guide portion that forms a receiving structure for receiving a convex portion protruding from the center frame,
A lower traveling body for construction machinery characterized by the above. An expansion / contraction adjustment unit for adjusting expansion / contraction of the side frame;
The lower traveling body for a construction machine according to claim 1. The expansion / contraction adjustment part is a hydraulic cylinder,
One end of the hydraulic cylinder is attached to the guide portion, and the other end of the hydraulic cylinder is attached to the center frame.
The lower traveling body for a construction machine according to claim 2. An expansion / contraction limiting mechanism for limiting expansion / contraction of the side frame;
The lower traveling body for a construction machine according to any one of claims 1 to 3. The guide portion is removably attached to the side frame.
The lower traveling body for a construction machine according to any one of claims 1 to 4.

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